WO2004043258A1

WO2004043258A1 - Needle insertion tool

Info

Publication number: WO2004043258A1
Application number: PCT/JP2003/013678
Authority: WO
Inventors: Satoru Tominaga; Mamoru Kanno
Original assignee: Sekisui Chemical Co., Ltd.
Priority date: 2002-10-28
Filing date: 2003-10-27
Publication date: 2004-05-27
Also published as: JPWO2004043258A1; AU2003275671A1

Abstract

A needle insertion tool has a front plunger (3) axially movably provided near a fore-end of and in a housing (1) and having an insertion needle (42), a rear plunger (5) provided behind the front plunger so as to be axially movable in the housing, a front spring (6) for pulling backward the front plunger, and a rear spring (7) for pushing forward the rear plunger. The insertion needle can be instantly, forcibly projected a cap (2) and then reversed, so that a moving distance of the front plunger with the insertion needle can be reduced. This solves a problem such as the microvibration of the needle and a measuring instrument or the microvibration and shock of the springs being transmitted to a fingertip for a long time, dulling a patient’s pain as much as possible.

Description

Puncture device Technical field

The present invention relates to a puncture device used for taking blood from a living body site such as a fingertip in a blood test, for example.

Akira Background technology

In recent years, the number of diabetic patients has been increasing, and methods of measuring and managing blood sugar levels using blood sugar level measuring devices by themselves have become mainstream. In the measurement, the patient collects blood for measurement from his / her fingertip. At this time, a needle is pierced into the skin of the fingertip using a puncture device equipped with a puncture needle, and the blood is squeezed out by pressing around the puncture part.

In the conventional puncture device, a plunger provided with a puncture needle at the tip is advanced with a single coil panel in a housing, and the needle is punctured into the fingertip surface. However, in this structure, if the biasing force of the panel is adjusted so as to apply a large pushing force to the needle during puncturing, it becomes difficult for the needle to return into the housing, and conversely, when the needle is surely returned to the housing. Since a large piercing force that can be pierced cannot be obtained, it is inconvenient to use and easily hurts the patient.

Recently, a puncture device having a configuration in which a plunger provided with a puncture needle is biased by using separate panels in the front end direction and the rear end direction has been proposed and is commercially available (Japanese Patent Application Laid-Open No. 2000-245). No. 717 publication). However, even with this puncture device, the puncture is painful to the patient.

Also, a puncture device equipped with a lance pushing mechanism has been proposed (Japanese Patent Application Laid-Open No. 3-141,929). However, this puncture device has a drawback in that the puncture needle cannot be quickly ejected from the tip of the housing. The cause of pain in a patient when puncturing with the puncture device having the configuration disclosed in Japanese Patent Application Laid-Open No. 2000-245571 is considered as follows. In other words, the puncture device is configured such that when one plunger advances and retreats, the puncture needle provided at the distal end of the lance protrudes from the housing and returns to the housing. In order for the plunger to move forward, the biasing force of the panel must be greater than the biasing force of the plunger to retract. If the biasing force of the panel that retracts the plunger is small, the fingertip will be subjected to minute vibrations of the needle and the measuring instrument for a long time when the needle returns from the fingertip, causing pain. In addition, when the puncture needle is switched from protruding to returning, the return biasing force is small, so this switching must be performed when the spring is extended to some extent, and as a result, the travel distance of the plunger within the housing is reduced. It becomes longer and the vibration and shock of the panel are easily transmitted to the fingertips, which causes pain.

SUMMARY OF THE INVENTION In view of the above circumstances, it is an object of the present invention to enhance the return force of a plunger provided with a puncture needle to shorten the moving distance thereof, and to cause slight vibration of a needle or a measuring instrument, or slight vibration or impact of a panel. The purpose of the present invention is to provide a puncture device that can prevent the patient from transmitting to the fingertip for a long time, and can reduce the pain suffered by the patient as much as possible.

Throughout the claims and the entire specification, the term “forward or distal direction” refers to the direction in which the needle projects from the puncture device during puncturing, that is, the left direction in FIGS. The relationship is based on Figures 2 and 10. Disclosure of the invention

The present invention has been devised to solve the above problems.

The first puncture device according to the present invention, It is composed of a cylinder having a rear end wall (11), and has a front protruding portion (12) on the inner surface near the front, a rear protruding portion (13) after the front protruding portion (12), and a side portion. A housing (1) having a puncture operation part (14) and a rear stud (15);

A cap (2) provided at the front end of the housing (1), having a needle passage hole (21) at the center of the front end, and having a rear end surface forming a front stopper (22); and the housing (1). It is arranged near the front end so that it is movable in the axial direction, but is prevented from moving forward by the front stopper (22) and prevented from moving backward by the front projection (12). Annular front plunger (3)

It is detachably attached to the front end of the front plunger (3), and moves through the needle passage hole (21) of the cap (2) as the front plunger (3) moves back and forth. A needle unit (4) for protruding and retracting the piercing needle (42) from the second plunger; and a rear plunger (3) arranged behind the front plunger (3) so as to be axially movable in the housing (1). 3) has an end portion (51) that can pass through the inside of the ring, and is locked by the rear stopper (15) of the housing (1), and is operated by the puncture operating part (14) to operate the rear stopper (15). And a rear plunger (5) having an operating rod (52) having a locking portion (53) detachable from the housing (1) and projecting rearward through the rear end wall (11) of the housing (1). ,

A front plunger engaging portion (32) provided on the inner surface of the front plunger (3);

A rear plunger engaging portion (54) which is provided on a side portion of the front end portion (51) of the rear plunger (5), and which engages with and disengages from the front plunger one engaging portion (32);

A front spring (6) that extends between the front plunger (3) and the rear projection (13) of the housing (1) and pulls the front plunger (3) rearward, and a rear plunger (5). ) And a rear spring (7) interposed between the rear end wall (11) of the housing (1) and pushing the rear plunger (5) forward. It is a puncture device.

In the first puncture device, the front protrusion (12) of the housing (1) and / or the front stopper (22) of the cap (2) are preferably made of a shock absorbing material. The second puncture device according to the present invention comprises:

A barrel (115) having a push button hole (113); a cap (112) detachably provided at the tip of the barrel and having a needle passage hole (111) at the tip; A housing (101) includes a body cover (117) having a push button (116) facing the push button hole and a charge case (118) provided at the rear end of the body so as to be movable back and forth. The needle unit has a needle unit (119) detachably held at the tip in the housing, and a needle push bar (123) for pushing the needle unit forward. The holder (120) is housed so that it can move back and forth with respect to the housing,

The needle unit holder is provided with a locking projection (121) which is variable inward and outward due to elasticity so as to fit into the push button hole in the retracted state of the holder unit to prevent the needle unit holder unit from moving forward,

A main spring (124) for urging the holder unit forward is interposed between the barrel and the needle unit holder, and the holder is biased backward between the needle unit holder and the charge case. Auxiliary panel (122)

By retracting the charge case with respect to the barrel, the main case is provided with an urging force for moving the needle unit holder forward, and the auxiliary spring is also provided with an urging force for moving the needle unit holder back.

The main panel, by operating the push button to release the locking projection from the push button hole, advances the needle unit holder by the forward biasing force, and moves the needle puncture needle (125) out of the needle passage hole. Let it stick out, The catching spring retracts the advanced needle unit holder with a rearward urging force, and stores the puncture needle in the cap.

A spring stopper (114) is provided on the barrel body so as to protrude inward, and the vanes stopper controls the release of the main panel within a predetermined length when the needle unit holder advances. It is a puncture tool at the position where the front end of the main panel hits. The preferred embodiment of the second puncture device is

A needle unit push piece (151) having an inward projection (152) is provided on the housing so as to be slidable back and forth.

A movable piece (153) with a variable inclination angle is rotatably supported on the inward projection, and between the movable piece and the rear end of the needle unit holder, the tip of the movable piece contacts the needle push rod. A movable one-time spring (154) that urges the movable piece to rotate is interposed,

The movable piece is pressed against the needle push bar by pushing the needle unit push piece against the urging force of the movable piece rotating panel, and pushes the needle forward. The needle is released from the needle unit holder 1 and then returned to the original position by the biasing force of the movable half-turning spring. The rear part of the movable half-turning panel is located inside the catching spring, using a puncture device. is there.

A more preferable embodiment of the second puncture device is a puncture device in which an intermediate portion of the movable single-sided rotation panel is passed through the inside of the main panel. Another preferred embodiment of the second puncture device is a puncture device provided with a plurality of pointed projections (178) which are forwardly pointed on the distal end surface, and more specifically, the front end of the housing. The puncture device is provided with a tip cover (176) having a large number of pointed projections that are pointed forward on the tip surface.

The shape of the pointed protrusion is preferably conical or pyramidal. Spike The height of the part is preferably between 0.3 and 0.7 mm, more preferably between 0.3 and 0.6 mm. The multiple piercing devices may be uniform or random in height. The number of pointed protrusions is preferably about 5 to 50, more preferably 8 to 35. The arrangement of the pointed protrusions on the distal end surface of the distal end cover may be random or may have a specific pattern. This pattern may be concentric, radial, etc. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a perspective view showing a disassembled state of the puncture device according to the first embodiment. FIG. 2 is a longitudinal sectional view of the puncture device in a state before a puncture operation. FIG. 3 is a longitudinal cross-sectional view of the puncture device showing a state in which the rear plunger (5) is pulled rearward and the locking portion (53) is locked to the rear stopper (15) of the housing (1). It is.

FIG. 4 is a longitudinal cross-sectional view of the puncture device showing a state in which the locking portion (53) of the rear plunger (5) has been detached from the housing (15) after the housing (1).

In FIG. 5, the rear plunger (5) is pushed forward by the rear spring (7), and the front end face of the front plunger (3) hits the front stopper (22) of the cap (2). It is a longitudinal cross-sectional view of the puncture device which shows the state advanced to the barrel.

FIG. 6 is a longitudinal cross-sectional view of the puncture device showing a state in which the ridge of the rear plunger-engaging portion (54) has slipped forward from the recess of the front plunger engaging portion (32).

FIG. 7 is a longitudinal sectional view of the puncture device showing a state in which the front plunger (3) is pulled backward by the front spring (6) and the puncture needle (42) is returned into the cap (2). .

FIG. 8 is a perspective view of the puncture device according to the second embodiment.

FIG. 9 is a perspective view showing a disassembled state of the puncture device.

FIG. 10 is a vertical longitudinal sectional view of the puncture device showing a state before a puncture start operation. FIG. 11 is a vertical longitudinal sectional view of the puncture device in a charged state. FIG. 12 is a vertical longitudinal sectional view of the puncture device in a standby state.

FIG. 13 is a vertical longitudinal sectional view of the puncture device showing a puncture state.

Fig. 14 is a vertical cross-sectional view of the puncture device showing the needle unit released.

FIG. 15 is a perspective view showing a disassembled state of the front end of the puncture device. FIG. 16 is a vertical longitudinal sectional view of the puncture device showing a puncture state. BEST MODE FOR CARRYING OUT THE INVENTION

Next, the present invention will be specifically described based on the illustrated embodiment. Example 1 corresponds to the first puncture device, and Example 2 corresponds to the second puncture device.

Example 1

In FIGS. 1 to 7, the housing (1) is made of a synthetic resin, is constituted by a cylindrical body having a rear end wall (11), and has an annular front protruding portion (12) on the inner surface on the front side. An annular rear projection (13) is provided after the front projection (12). The front projection (12) is made of rubber so as to absorb impact. A puncturing operation section (14) is formed on the rear side of the housing (1) by cutting the side wall in a tongue shape and bending the tongue outward slightly. The rear end face of the rim is a rear stopper (15). The puncture operation section (14) is elastically deformable inward and outward. In the center of the rear end wall (11) of the housing (1), a rod passage hole (16) having a diameter that allows the operation rod (52) of the rear plunger (5) to pass through is formed. I have. The housing (1) also functions as a grip when using a puncture device.

The cap (2) is provided inside the housing (1) by screwing the male thread (23) into the female thread (17) at the tip of the housing (1). A needle (42) passes through the center of the tip of the cap (2). A needle passage hole (21) having a diameter that can be cut is provided. The rear end of the cap (2) forms a step with the inner surface of the housing (1), and the rear end of the cap (2) forms the front stopper (22). The stopper (22) in front of the cap (2) is made of rubber to absorb shock.

The front plunger (3) consists of a short ring or cylinder made of synthetic resin having an outer diameter slightly smaller than the inner diameter of the housing (1). It is located near the tip in the housing (1) and is movable in the axial direction, but is prevented from moving forward by the front stopper (22) of the cap (2), and The retreat is prevented by the front projection (12) of (1).

A bridge (33) is provided at the front end of the front plunger (3) in the diameter direction, and a small cylindrical portion (34) is provided at the center of the bridge (33), that is, at the axis of the front bracket (3). ) Are provided in the axial direction.

The needle unit (4) is composed of a cylindrical needle holding member (41) and a puncture needle (42) provided on the distal end surface of the needle holding member (41) so as to protrude forward. Is removably attached to the small cylindrical portion (34) of the front plunger (3). The piercing needle (42) of the needle unit (4) moves out and out of the cap (2) through the needle passage hole (21) of the cap (2) with the forward and backward movement of the front plunger (3). I do.

The rear plunger (5) is also made of a synthetic resin cylinder having an outer diameter slightly smaller than the inner diameter of the housing (1). It is disposed movably in the axial direction in the housing (1) behind the front plunger (3) and has a tip (51) that can be inserted into the ring of the front plunger (3). On the rear side of the rear plunger (5), a locking portion (53) is formed which can be elastically deformed by forcibly bending the tongue outward by forcing the side wall in a tongue shape. This is locked by the stopper (15) after the housing (1), and then detached from the rear stopper (15) by the puncture operation part (14). Housing on rear end face of rear plunger (5) An operation port (52) projecting rearward through the port passage hole (16) of (1) is provided. The rear plunger (5) has a notch (55) formed at both ends (51) at the front end thereof, the cutout (55) opening toward the front end. The notch (55) is wide enough to fit the bridge (33) of the front plunger (3).

The front plunger engagement portion (32) is composed of a pair of recesses formed in a circumferential direction on the inner surface of the ring of the front plunger (3).

The rear plunger engaging portion (54) has a pair of tongues formed on the side of the front end (51) of the rear plunger (5) and circumferentially formed on the outer surface of the front end of each tongue. The tongue is elastically deformable inward and outward. These ridges engage and disengage from the recesses of the front plunger engagement portion (32).

The rear panel (7) is a compression coil panel that pushes the rear plunger (5) forward, and after the rear plunger (5) and the housing (1) so as to wind the operation rod (52). It is interposed between the end wall (11). The biasing force of the rear panel (7) is such that the rear plunger (5) is pushed forward by the rear spring (7), and the front end face of the front plunger (3) interlocking with this pushes the cap (2). After hitting the front stopper (22), the ridge of the rear plunger engagement portion (54) comes out of the recess of the front plunger engagement portion (32) forward, and these engagements occur. Is set to be solved.

The front spring (6) is a tension coil spring that pulls the front plunger (3) backward, the front end of which is fixed to the front plunger (3), and the rear end of which is the rear projection (housing) of the housing (1). Fixed to 13). The biasing force of the front spring (6) is such that the rear plunger (5) moves forward and the rear plunger one engagement part (54) and the front plunger one engagement part (32) engage as described above. It is set so that the front plunger (3) is pulled back after is released.

The puncture operation of the first puncture device is performed as follows.

First, in the puncture device before the puncturing operation shown in FIG. 2, the rear plunger (5) and the rear plunger-engaging portion (54) are engaged with the front plunger (3). The front plunger is disengaged from the engaging portion (32), and the locking portion (53) of the rear plunger (5) is disengaged from the stopper (15) after the housing (1). The front plunger (3) is retracted with respect to the rear plunger (5), and the tip (51) of the latter is inserted into the cap (2). At this time, the former bridge (33) is fitted into the latter notch (55) so as to avoid interference between the two. The piercing needle (42) is housed in the cap (2).

From this state, as shown in Fig. 3, the operating port (52) is staked by the biasing force of the rear spring (7) and pulled rearward a maximum distance, and the rear plunger (5) is moved to the front plunger (5). 3), the protrusion of the rear plunger engaging portion (54) is fitted into the recess of the front plunger engaging portion (32), and the locking portion of the rear plunger (5) is engaged. Lock (53) to stopper (15) after housing (1).

Next, as shown in FIG. 4, the puncturing operation section (14) of the housing (1) is pushed inward, and the locking section (53) of the rear plunger (5) located inside the housing is pressed into the housing (1). Remove the stopper (15) after 1). Due to this separation, as shown in Fig. 5, the rear plunger (5) and the front plunger (3) linked thereto are pushed forward by the biasing force of the rear spring (7), and the front plunger (5) is pushed forward. Move forward until the front end of the jaw (3) hits the front spigot (22) of the cap (2). The moment the front plunger (3) hits the front collar (22), the puncture needle (42) protrudes forward through the needle passage hole (21) of the cap (2) and is punctured at the fingertip. .

Even after the front plunger (3) hits the front stopper (22), the rear plunger (5) is urged forward by the rear spring (7), and as a result, as shown in FIG. In addition, the ridge of the rear plunger engagement portion (54) comes out of the recess of the front plunger engagement portion (32) to disengage the two.

Simultaneously with this disengagement, as shown in FIG. 7, the front plunger (3) is pulled backward by the urging force of the front spring (6), and the puncture needle (42) is moved with the fingertip.

0 Is removed from the cap (2) and the puncture device is in the state shown in Fig. 0.

8 to 16, the second puncture device includes a housing (101), a needle unit forward / backward movement mechanism (102) and a needle unit discharge mechanism (103) housed therein, and a housing (101). And a pain relief mechanism (107) provided at the front end of the body.

The housing (101) has a body (115) having a push button hole (113) in the upper part, and is detachably provided at the tip of the body (115), and has a needle passage hole (111) in the center of the tip surface. ), A body cover (117) externally mounted on the body (115), and having a push button (116) facing the push button hole (113); and a body ( 115) and a charge case (118) provided at the rear end so as to be movable back and forth with respect to the barrel. The rear end of the cap (112) is detachably fitted over the front end of the barrel (115), and the front end of the case (118) is fitted to the rear end of the trunk cover (117). It is fitted.

The barrel (115) has a cylindrical shape with a bottom, and a pair of upper and lower square bars (165) and (166) of a needle unit holder (120) and a movable one-side rotating blade are provided on a rear end wall (171). A through hole (172) for passing the (154) and its locking projection (169) is opened, and receives the rear end of the main panel (124) on the front surface of the rear end wall (171).

The push button (116) provided on the upper part of the body cover (117) is made of an elastically deformable material, and is formed with a casing (182) and an inwardly projecting push button hole ( The tongue (183) faces the push button hole (113) by pressing the casing (182) downward. This state is maintained after the charger case (118) is pulled rearward with respect to the barrel (115). On the inner surface of the central part of the length of the charge case (118), an annular catching bar for receiving the front end of the auxiliary panel (122) is provided.

One The front end receiving piece (161) is fixed, and a pair of upper and lower square bars (165) and (166) of the needle unit holder (120), a movable piece rotating panel (154) and its locking projection are fixed in the ring. (169) is passed through.

A spring stopper (114) is provided on the barrel (115) so as to protrude inward. A plurality of vanes tongues (114) are formed on the inner surface of a cut-off ring (158) that is separate from the barrel (115), and the cut-off rings (158) are formed on the outer surface of the barrel (115). By inserting the spring stopper (114) into the plurality of through holes (160) formed in the concave groove (159) while fitting into the concave groove (159) formed in the circumferential direction, the barrel body is formed. (115) is provided in an inwardly projecting shape. The missing ring (158) does not fall out of the concave groove (159) because the body cover (117) is externally mounted on the body (115). The vanes topper (114) is positioned at the position where the front end of the main spring (124) contacts so as to keep the release of the main spring (124) within a predetermined length when the needle unit holder (120) advances. is there.

The needle unit longitudinal movement mechanism (102) is configured as follows. As described above, the needle unit (119) is detachably attached to the tip in the housing (101) provided with the push button hole (113), the push button (116) facing the same, and the spring stopper (114). A needle unit holder (120) having a needle push bar (123) slidably for holding and for pushing the needle unit (119) forward is accommodated in the housing so as to be movable back and forth. The needle unit (119) has a cylindrical shape, and a puncture needle (125) is attached to the center of the distal end face in a forwardly protruding manner. The rear half (104) of the needle unit (119) is housed in a bottomed cylindrical unit-holding part (162) formed at the front end of the needle unit holder (120).

The needle push bar (123) is composed of a disk portion and a sliding portion having a T-shaped cross section provided vertically to the rear surface of the disk portion, and the horizontal portion (181) of the sliding portion is a unit holding portion (162). The disc unit is slidably disposed in an elongated hole (180) formed to extend rearward from the rear wall of the needle unit (119) and the rear end surface (104) of the needle unit (119). Between the rear wall portions of the holding portion (162).

Two A flexible portion (164) extending rearward is provided on the upper side of the needle unit holder (120), and a locking projection (121) is formed at the tip thereof so as to protrude outward. The locking projection (121) is movable inward and outward, that is, in the radial direction due to the elasticity of the flexible portion (164). In the retracted state of the holder, the locking projection (121) is fitted into the push button hole (113) to fit the needle unit. Prevents the holder (120) from moving back and forth.

At the lower center of the length of the needle unit holder (120), the longer (left side when viewed from the front) horizontal pin (106) of the horizontal pin (106) (184) of the movable piece (152), There is an elongated hole (170) for guiding to

The rear half of the needle unit holder (120) consists of a pair of upper and lower square bars (165) and (166), and a step receiving the rear end of the main panel (124) on the lower surface of the front end of the lower square bar (166). (167) is provided, and a supporting spring rear end receiving piece (168) for receiving the rear end of the supporting spring (122) is fixed to the rear ends of the pair of square bar portions (165) and (166). A locking projection (169) for hooking the rear end of the movable half-rotating spring (154) is provided at the bridge portion near the rear end of the square bar portions (165) and (166).

The main spring (124) is a compression coil spring, which covers a pair of upper and lower square bars (165) (166), and normally has a rear end wall (171) and a needle unit holder of the barrel (115). The needle unit (120) is interposed between the step unit (167) and the needle unit holder (120).

The catching spring (122) is also a compression coil spring, and has a pair of upper and lower square rods (165) and (166), and the catch panel (168) of the needle unit holder (120) and the charge case. It is interposed between the catching spring front receiving piece (161) of (118) and urges the needle unit holder (120) backward. The catching spring (122) is always located behind the main spring (124).

The movable piece rotating panel (154) is a tension coil spring, and its middle part is arranged in the main panel (124), and its rear end is arranged in the catching panel (122). With such an arrangement, the diameter of the puncture device can be reduced, and the puncture device can be made compact.

Three The needle unit longitudinal movement mechanism (102) is operated as follows.

First, before the puncture operation shown in FIG. 10 starts, the rear half (104) of the new needle unit (119) is placed in the unit holding portion (162) of the needle unit holder (120). The charge case (118) is located at the most advanced position with respect to the barrel (115), and the locking projection (121) of the needle unit holder (120) extends from the button hole (113) of the barrel (115). Comes out and lies ahead of this. The main spring (124), the auxiliary spring (122), and the movable one-side rotating panel (154) are all in a release state.

As shown in FIG. 11, when the charge case (118) is pulled backward with respect to the barrel (115), the catching spring (122) is compressed accordingly, and the needle unit holder is removed. (120) is retracted, and the locking projection (121) is fitted into the button hole (113) of the barrel (115) to prevent the needle unit holder (120) from advancing. The main panel (124) is also compressed. The compression of the main panel (124) generates an urging force for moving the needle unit holder (120) forward, and the compression of the auxiliary spring (122) generates an urging force for retracting the needle unit holder-(120). . In this way, the charge case (118) is retracted, and the state in which the main spring (124) and the auxiliary spring (122) are compressed, that is, the charged state is maintained.

In FIG. 12, when the charge case (118) in the charged state is released, the charge case (118) is advanced by the urging force of the auxiliary spring (122), and the state shown in FIG. Return to In this state, it waits for the next puncturing operation.

In FIG. 13, the push button (116) is pushed to release the locking projection (121) from the push button hole (113). As a result, the needle unit holder (120) is advanced by the forward biasing force of the main spring (124), and the puncture needle (125) of the needle unit (119) is inserted into the needle passage hole of the cap (112). (111) and through the needle passage hole (179) of the tip force bar (176), it protrudes forward from the tip cover (176) by a predetermined length, and pierces the skin of the fingertip. In this puncturing state, the spring collar (114) of the barrel (115) is located behind the step (167) of the needle unit holder (120). As a result, the front end of the main panel (124) hits the spring collar (114), and the release length of the main spring (124) is kept shorter than the length of the fully released state. The main spring (124) acts to prevent the auxiliary spring (122) from returning to the rear of the needle unit (119), and the main panel (124) prevents the needle unit (119) from moving. The backward return stopping force is reduced by the length of the main spring (124) hitting the spring tongue (114) from the completely released state of the main spring (124) by the installation of the tongue tongue (114). Therefore, the needle unit (119) is quickly retracted by the rear urging force of the catch panel (122). Also, when the main spring (124) is completely released and further moved forward and its front end hits or rebounds on the step (167) of the needle unit holder (120), Impact noise and vibration noise are generated, but the generation of such noise can be prevented by installing a pan stop (114).

After the puncture, the needle unit holder (120) is retracted by the rearward biasing force of the catching spring (122), and the puncture needle (125) of the needle unit (119) is stored in the cap (112). Return to the state of FIG.

Next, the needle unit discharging mechanism (103) will be described.

In the needle unit discharging mechanism (103), a needle unit pushing piece (151) having a pair of left and right inner protrusions (152) on the inner surface of the rear end is provided below the body cover (117). ) Is provided so as to be able to slide back and forth. The inward projection (152) is located inside the barrel (115). A movable piece (153) having a variable inclination angle is rotatably supported on the inward projection (152). The movable piece (153) is L-shaped when viewed from the side, and has horizontal pins (106) and (184) projecting to both sides below the rear end (the left pin (106) when viewed from the front is Longer than the right), these horizontal pins (106) and (184) are arranged on the front side of the pair of inward protrusions (152), and the movable piece (153) is rotatable about the inward protrusion (152). It is supported. The tip of the longer horizontal pin (106) It is in the long hole (170) that guides backward.

The front end of the movable piece rotating panel (154) is hooked on a locking projection (105) provided on the rear end upper part of the movable piece (153), and the movable piece (153) and the needle unit holder (120) are locked. A movable one-sided rotation spring (154), which is a tension spring, is interposed between the rear ends. The movable piece rotating panel (154) rotates the movable piece (153) in the direction in which the tip of the movable piece (153) comes into contact with the rear end face of the needle push bar (123) (clockwise from the state shown in Fig. 10). Energize this. By installing the movable piece rotating panel (154), the movable piece (153) can be quickly returned to the original position after the used needle unit (119) is discharged. In addition, since the rear end of the movable piece rotating panel (154) is provided so as to penetrate the inside of the auxiliary panel (122) as described above, the length of the auxiliary panel (122) in the release state is set. And the number of effective turns can be increased, and the pitch angle can be reduced to 10 degrees or less. The spring index D / d is 4 to 30, preferably 8 to 14 (D is the coil diameter, d is the wire diameter).

The needle unit discharge mechanism (103) is operated as follows.

In FIG. 14, the needle unit pushing piece (151) is piled by the urging force of the movable piece rotating panel (154) and pushed forward. Thereby, the movable piece (153) is guided by the elongated hole (170) and advances, and its front end contacts the rear end face of the needle push rod (123) and pushes it forward. As a result, the used needle unit (119) is discharged from the needle unit holder (120).

Thereafter, when the needle unit pushing piece (151) is released, the movable piece (153) is returned to the original position by the biasing force of the movable piece rotating spring (154), and the barrel (115) is released. ) Is turned in the anti-contact direction (counterclockwise from the state of Fig. 10) by contact with the lower inner inclined portion (155), and interference with the needle push bar (123) is avoided.

Next, the pain relief mechanism (107) of the puncture device will be described.

In Figures 8, 15 and 16, a gentle spiral groove (175) is formed on the outer peripheral surface of the small-diameter portion at the tip of the cap (112), and an inner side is formed on the front end side. A needle protrusion adjusting ring (174) having a protrusion (173) is fitted over the small-diameter portion of the tip of the cap (112), and the inner protrusion (173) is disposed in the spiral groove (175). And a cam mechanism. That is, by rotating the ring (174) with respect to the cap (112), the ring (174) is moved back and forth. A tip cover (176) having a number of sharp projections (178) on the tip surface and a needle passage hole (179) at the center of the tip wall is put on the ring (174), and the inner surface recess is provided. The engagement protrusion (177) at the front end of the ring (174) is fitted. The needle passage hole (179) of the tip cover (176) is provided so as to overlap the needle passage hole (111) of the cap (112). Therefore, when the tip cover (176) is turned, the ring (174) rotates and the tip cover (176) also moves back and forth with the forward and backward movement of the ring (174). The length of the protruding end from the tip cover (176) via the needle passage hole (111) of the cap (112) and the needle passage hole (179) of the tip cover (176) is adjusted.

According to the pain relieving mechanism (107), when the tip cover (176) is pressed against the fingertip of the patient and the tip of the puncture needle (125) is pierced into the fingertip, a large number of the tip force bars (176) are used. The pointed protrusion (178) causes a weak stimulus to the fingertip, which disperses and alleviates the pain caused by the puncture needle (125). The present invention has the following advantageous effects.

The first puncture device is axially movable near the distal end in the housing (1), and has a front plunger (3) having a puncture needle (42) and a rear plunger (3). The rear plunger (5), which is movably arranged in the housing (1) in the axial direction, the front panel (6) pulling the front plunger (3) backward, and the rear plunger (5) forward Since the panel (7) is provided after the pressing, the puncture needle (42) can be momentarily and forcibly protruded from the cap (2) and then retracted, and the puncture needle (42) is provided. The travel distance of the front plunger (3) can be shortened. Therefore, the fine vibration of the needle or measuring instrument or the fine vibration or shock of the panel is long.

7 This solves the problem of being transmitted to the fingertips of the user's fingertips, thus reducing the pain suffered by the patient as much as possible.

In addition, the front plunger (3) can be formed by forming the front projection (12) of the housing (1) and / or the front flange (22) of the cap (2) with a shock absorbing material. When the front end face of the housing hits the front collar (22) of the cap (2), or when the rear end face of the front plunger (3) hits the front projection (12) of the housing (1), the impact or The sound associated with the sound can be absorbed or mitigated, and the fear caused by the impact sound can be reduced.

In the second puncture device, a main spring (124) for urging the holder unit forward is interposed between the barrel body (115) and the needle unit holder (120), and the needle unit is mounted. An auxiliary panel (122) that urges the holder backward is interposed between the holder and the charge case (118), so that the puncture needle can be momentarily and forcibly protruded from the cap. It can then be quickly retracted. Therefore, it is possible to solve the problem that the fine vibration or impact of the needle or the measuring instrument or the vibration of the panel is transmitted to the fingertip for a long time, thereby reducing the pain received by the patient as much as possible.

Further, a spring stopper (114) is provided on the barrel (115) so as to protrude inward, and a vanes stopper (114) is provided on the main spring (124) when the needle unit holder is advanced. The front end of the main panel (124) is located so as to keep the release within a predetermined length. As shown in FIG. 13, in the puncture state, the spring stopper (114) of the barrel (115) is located behind the step (167) of the needle unit holder (120). As a result, the front end of the main spring (124) hits the spring stopper (114), and the release length of the main spring (124) is kept shorter than the length of the fully released state. The main spring (124) acts to prevent the auxiliary panel (122) from returning to the rear of the needle unit (119), but the main spring (124) prevents the needle unit (119) from returning backward. The force is applied to the main spring (124) by installing the vanes top (114).

8 From the complete release state of the spring to the spring stopper (114). Therefore, the needle unit (119) is quickly retracted by the rearward biasing force of the catching spring (122). Also, when the main panel (124) is completely released and further moved forward and its front end hits or rebounds on the step (167) of the needle unit holder (120), Impact noise and vibration noise are generated, but the generation of such noise can be prevented by installing the spring collar (114).

In a preferred form, the rear part of the movable one-sided spring (154) is arranged inside the catch panel (122), so that the length of the catch spring (122) in the released state and the effective number of turns are set. And the pitch angle can be reduced. Also in this point, the puncture needle protruding from the cap can be quickly retracted. Also, the diameter of the puncture device can be reduced, and the puncture device can be made compact. If the movable half-turning spring is also arranged inside the main panel, the puncture device can be made more compact.o

In another preferred form, the distal end surface is provided with a large number of pointed protrusions which are pointed forward, so that the distal end surface is pressed against the patient's fingertip, and the distal end of the puncture needle is pierced into the fingertip. The large number of protruding parts gives a weak stimulus to the fingertip, thereby effectively dispersing the pain caused by the puncture needle and thereby reducing the pain received by the patient as much as possible. Industrial applicability

The present invention relates to a puncture device used for taking blood from a living body site such as a fingertip in a blood test, for example. According to the present invention, the return force of the plunger provided with the puncture needle is enhanced to shorten the moving distance, and the fine vibration or impact of the needle or the measuring instrument or the fine vibration or impact of the panel is transmitted to the fingertip for a long time There is provided a puncture device capable of minimizing pain and reducing the pain received by the patient as much as possible.

9

Claims

The scope of the claims

1. It comprises a cylindrical body having a rear end wall (11), has a front protruding portion (12) on the inner surface near the front, has a rear protruding portion (13) after the front protruding portion (12), A housing (1) having a puncture operation section (14) and a rear stud (15) on the side;

A cap (2) provided at the front end of the housing (1), having a needle passage hole (21) at the center of the front end, and having a rear end surface forming a front stopper (22); and the housing (1). An annular ring which is movable toward the axial direction but is prevented from moving forward by the front flange (22) and is prevented from moving backward by the front projection (12). Before plunger one (3),

It is detachably attached to the tip of the front plunger (3), and moves through the needle passage hole (21) of the cap (2) as the front plunger (3) moves back and forth. A needle unit (4) for allowing the puncture needle (42) to protrude and retract from the nip (2); and a rear plunger (3) that is disposed movably in the axial direction within the housing (1). It has a tip (51) that can pass through the inside of the ring of the jaw (3) and is locked by the rear stopper (15) at the rear of the housing (1) to operate the puncture operating part (14). A rear bracket having an engaging portion (53) detachable from the stopper (15), and having an operating rod (52) projecting rearward through the rear end wall (11) of the housing (1). The judge (5),

A front plunger engaging portion (32) provided on the inner surface of the ring of the front plunger (3);

The rear plunger (54) is provided on the side of the distal end (51) of the rear plunger (5), and engages with and disengages from the front plunger one engaging part (32). ,

A front panel (6) provided between the front plunger (3) and the rear projection (13) of the housing (1) and pulling the front plunger (3) backward; A rear spring (7) interposed between the rear plunger (5) and the rear end wall (11) of the housing (1) and pressing the rear plunger (5) forward;

Puncture tool.

2. The puncture device according to claim 1, wherein the front projection (12) of the housing (1) and / or the front collar (22) of the cap (2) are made of a shock absorbing material.

3. A barrel (115) having a push button hole (113), a cap (112) detachably provided at the tip of the barrel and having a needle passage hole (111) at the tip, and a barrel. A housing (101) comprising: a body cover (117) having a push button (116) external to the body and facing a push button hole; and a charge case (118) provided at the rear end of the body so as to be movable back and forth. Is composed of

A needle unit holder (120) holding a needle unit (119) detachably at the tip and a needle push bar (123) that pushes the needle unit forward is slidably moved forward and backward in the housing. It can be moved back and forth with respect to the housing,

The needle unit holder is provided with a locking projection (121) which is variable inward and outward due to elasticity so as to be fitted into the push button hole in the retracted state of the holder to prevent the needle unit holder from moving forward.

A main panel (124) for urging the holder forward is interposed between the barrel and the needle unit holder, and the holder is urged rearward between the needle unit holder and the cartridge case. A catching spring (122)

By retracting the charge case with respect to the barrel, the charge case gives the main panel an urging force to move the needle unit holder forward, and

Two The urging force to retreat the needle unit holder is applied to the catch panel, and the main panel moves the needle unit holder forward by the forward urging force by releasing the locking projection from the push button hole by operating the push button. Then, the puncture needle (125) of the needle unit protrudes from the needle passage hole,

The capture panel retracts the advanced needle unit holder with a rearward urging force, places the puncture needle in the cap,

A spring stopper (114) is provided on the barrel so as to protrude inward, and the vanes stopper controls the main spring release within a predetermined length when the needle unit holder advances. A puncture device located at the position where the front end of the main panel touches.

4. A needle unit push piece (151) having an inward projection (152) is provided on the housing so as to be slidable back and forth.

The movable unit pushes the needle unit nip by the biasing force of the movable unit rotating spring and pushes forward, so that the movable unit comes into contact with the needle push bar and pushes it forward, thereby using the used needle unit. 4. The device according to claim 3, wherein the movable unit is discharged from the needle unit holder, and thereafter returned to an original position by a biasing force of the movable unit rotating panel, and a rear portion of the movable unit rotating panel is disposed inside the catching panel. Puncture tool.

5. The puncture device according to claim 4, wherein an intermediate portion of the movable piece rotating panel is passed through the inside of the main spring.

6. A number of sharp projections (178) pointed forward are provided on the tip surface. Have been

The puncture device according to claim 3.

7. At the front end of the housing, there is provided a tip cover (176) having a large number of forwardly pointed projections on the tip surface.

The puncture device according to claim 3.