AU4621501A - Method and apparatus for treating stenosis or other constriction in a bodily conduit - Google Patents

Description

S&F Ref: 375532D1

AUSTRALIA

PATENTS ACT 1990 COMPLETE SPECIFICATION FOR A STANDARD PATENT

ORIGINAL

a Name and Address of Applicant: Actual Inventor(s): Address for Service: Invention Title: Angiorad, L.L.C.

424 W. McNeese Street Lake Charles Louisiana 70605 United States of America Samuel F. Liprie Spruson Ferguson St Martins Tower,Level 31 Market Street Sydney NSW 2000 Method and Apparatus for Treating Stenosis or Other Constriction in a Bodily Conduit The following statement is a full description of this invention, including the best method of performing it known to me/us:- IP Australia Documents received on: L 2 MAY 2001 Batch No: 5845c Method and Apparatus for Treating Stenosis or Other Constriction in a Bodily Conduit Background of the Invention 1. Field of the Invention The present invention relates to the field of treating a stenosis which would occur in various blood vessels and other bodily conduits as well as to the field of angioplasty. Additionally, the present invention is directed to the field of treating cancer which would occur in various body conduits or ducts, as well as to the field of brachytherapy.

2. Description of the Prior Art Various techniques have been developed to treat many different conduits in the body when these conduits have become reduced in size due to the existence of a stenosis or have been completely occluded. These techniques include introducing a deflated balloon catheter to the site of the stenosis or occlusion, inflating the balloon one or more times to eliminate the size of the stenosis, deflating the balloon and then removing the balloon catheter from the treatment site.

With respect to the vascular pathways, angioplasty is used to open an artery or blood vessel in the region where the stenosis or the occlusion has occurred. A typical angioplasty procedure consists of making a small incision through the body S: 20 and into a blood vessel and then manoeuvring a guide wire through the vascular 0system to a point beyond the stenosis or occlusion. A hollow catheter with a 00.. deflatable balloon near its distal end is threaded over the guide wire and advanced to the point of stenosis or occlusion. The balloon is then inflated and deflated S* several times to widen the constricted area, and is then withdrawn from the body.

25 Unfortunately, although the angioplasty procedure does markedly reduce the area of stenosis or occlusion, many patients exhibit a recurrence of the stenosis within a few months of the original procedure.

00."Although the original stenosis occurs by means of the build up of plaque over a relatively long period of time, experimentation has lead many to believe that the S0 30o recurrence of the stenosis after the original angioplasty procedure is unrelated to 0 4 the cause of the original stenosis. It is believed that the inflation of the balloon catheter used in the angioplasty procedure or the placement of a stent in the area of the stenosis causes irritation to the blood vessel. This irritation produces a mechanism of action called hyperplasia, inducing the inner layer of the blood vessel cells to rapidly reproduce, thereby causing restenosis. It has been proposed that if the blood vessel is irradiated at the point of the stenosis with a radioactive dose, the mechanism that causes hyperplasia would be destroyed without harming the blood vessel itself.

LibfA1 9713 2 During this procedure, it is important to precisely control the amount of radiation which is directed to the blood vessel wall, since too much radiation could actually induce hyperplasia as well as destroying a portion of the blood vessel, making it possible for an aneurism or rupture to occur. US. 5 213 561 and US. 199 939, as well as PCT/US92/07447, describe various methods and apparatus for introducing radiation to the site of a stenosis to endeavour to prevent restenosis.

US. 5 213 561 describes a method and apparatus for preventing restenosis after angioplasty. A balloon catheter transported by a conventional guide wire is delivered to the location of the stenosis. Particles or crystals of radioactive material are embedded or mounted on a tube provided inside the balloon catheter. A retractable radiation shielding sleeve is slidable along the tube to cover the source of radioactive material. Upon completion of the angioplasty, the shielding sleeve is retracted and the area of the stenosis is irradiated. Although this apparatus does introduce radiation to the point of the stenosis, the retractable shielding surrounding is the source of radioactive material makes this catheter bulky and unwieldy to use. In this regard, it is very doubtful that a catheter system this bulky would fit into the smaller branches or vessels of the heart. It is also doubtful that a catheter this bulky **and stiff could be manoeuvred through the tighter bends and turns in many of the vessels.

20 An additional embodiment of US. 5,213 561 illustrates a stent which is made of or coated with a radioactive material such as iridium 192. Since the radioactive material is provided on the outer surface of the stent, it is very difficult to precisely administer the proper dosage of radiation to prevent hyperplasia without administering a level of radiation which would actually induce hyperplasia or other deleterious effects to the blood vessel.

PCT/US92/07447illustrates a method and apparatus for restenosis treatment by applying a radioactive dose to the stenosed region after reduction of the region by angioplasty or other means. As shown in Fig. 4, an angioplasty balloon is expanded in the vicinity of a lesion site and radioactive elements provided on the S3.: 0o exterior surface of the balloon are forced into contact with the region. Therefore, similar to US. 5 213 561, the presence of the radioactive material on the exterior of the catheter would make it very difficult to apply the precise amount of radiation to the region of interest. Additionally, both PCT/US92/07447as well as US. 5 213 561 describe balloon catheters which do not allow the blood within the vessel to flow during inflation of the balloon.

Object of the Invention It is an object of the present invention to overcome or substantially ameliorate some of the disadvantages of the prior art, or at least to provide a useful alternative.

Summary of the Invention There is firstly disclosed herein a device for treating an occlusion or a constriction in a vessel or other conduit in the body comprising: a flexible, elongated, hollow catheter having a distal end and a proximal end; a ribbed balloon having a distal end and a proximal end encircling a portion of said catheter proximate to said distal end; an inflation conduit associated with the ribbed balloon and an inflation source; and further comprising a membrane or sheath encircling at least a portion of said ribbed balloon.

*The present invention, at least in a preferred embodiment is directed towards an 15 apparatus for treating the location of a stenosis in a blood vessel or other hollow conduit in the body by inflating and deflating a balloon catheter one or more times. A source of radiation can then be advanced through the catheter to the site of the stenosis, centered within the blood vessel, and the site is then treated for a period of time with radiation.

Once the treatment is completed, both the radiation source and the balloon catheter are withdrawn.

Preferably, a radiopaque guide wire is inserted into the body through a small incision and is then introduced into a blood vessel or similar conduit. Once in place, a catheter having a ribbed balloon attached near the digital end thereof is threaded over the guide wire and is also advanced to the location of treatment. The interior of the catheter 25 can be provided with an elastic membrane, one-way valve or other similar device for sealing the distal end of the catheter, but allowing the guide wire to pass therethrough.

The guide wire is then removed and the ribbed balloon is inflated one or more times to reduce the size of the stenosis, while allowing blood to flow around the site of the stenosis to greatly decrease the patient's risk of a myocardial infarction or heart attack. A radioactive source is advanced into position through the balloon catheter to the site of the original stenosis. With the balloon inflated, the balloon catheter and the radioactive source are correctly centred within the blood vessel to administer a precise dose to the original area of the stenosis. After a period of time in which the original site of the [R:\LIBLL] II 127specie.doc:keh stenosis is irradiated from the radioactive source, both the radioactive source and the balloon catheter are then removed from the blood vessel and the body of the patient.

Contrast dye, helpful in locating the position of the catheter within a body vessel is injected therein by a conduit provided on the exterior surface of the catheter or through S the guide wire itself, after the core of the guide wire has been removed.

Another preferred embodiment of the present invention would include a membrane or sheath which would be attached to the ribbed balloon to insure that blood will be able to flow through the profusion channels between each of the lobes by insuring the plaque or other material does not clog these channels.

Brief Description of the Drawings A preferred embodiment of the invention will now be described, by way of example only, with reference to the accompanying drawings, wherein: Fig. 1 is a side view of a ribbed balloon catheter; Fig. 2 is a side view of a ribbed balloon catheter; Fig. 3 is a transverse cross-sectional view of the ribbed balloon catheter taken along lines 3-3 of Fig. 2; Fig. 4 is a longitudinal sectional view of a ribbed balloon catheter showing the radioactive source within the balloon catheter; Fig. 5 is a longitudinal sectional view showing the guide wire and the one-way valve; Figs. 6-9 are end views of the elastic membrane shown in Fig. 4 with or without the guide wire inserted therethrough; Fig. 10 is a front view of the one-way valve shown in Fig. Fig. 11 is a side view of the one-way valve with the guide wire passing therethrough; Fig. 12 is a front view of the one-way valve showing the smaller opening behind the flap; Fig. 13 is a side view of a removable core guide wire inserted into the body; Fig. 14 is a side view of the guide wire shown in Fig. 13 after the core has been removed; Fig. 15 is a side view of the guide wire shown in Fig. 14 after a Luer-Lock has been attached thereto; [R:\LIBLL]I 127specie.doc:keh Fig. 16 is a side view of a catheter for the treatment of cancer within a vessel, duct or airway; Fig. 17 is a front view of the ribbed balloon catheter having a membrane surrounding the lobes of the balloon; and Fig. 18 is a front view of the ribbed balloon catheter having a membrane connecting adjoining lobes.

Detailed Description of the Preferred Embodiments Although the present invention can be used to treat blockages in many body conduits, for ease of explanation, the present invention will be discussed with respect to a stenosis 5 provided in a blood vessel.

Figs. 1, 2 and 3 illustrate the catheter 10 after it has been inserted into the body and moved to the site of a stenosis 30 in a blood vessel 26. The catheter itself consists of a hollow, generally cylindrical member 12 which is constructed from a fairly flexible material such as polyethylene glycol so that it can be easily manoeuvred within the body 15is and travel over a guide wire 16 which was initially manoeuvred in the blood vessel to a position beyond the actual site of the stenosis. The interior of the catheter can be made of coated with a friction reducing material, such a PTFE to aid in the passing of the guide wire and the radioactive sources to the treatment site. The catheter itself is slightly tapered at its distal end 14 to facilitate movement through blood vessels or similar conduits or ducts. Both the guide wire 16 and the catheter 12 should be of sufficient length to travel to the site of occlusion or constriction in various conduits and certainly should be long enough to reach the heart. A ribbed balloon 18 surrounds a portion of the outer surface of the catheter 12 and contains a number of ribbed pleats. When these pleats are inflated by a syringe 24 injecting air into a conduit 25 extending along the S25 exterior surface of the catheter 12 to the balloon 18, the size of the stenosis would be S° reduced as well as allowing the catheter to be properly centred when a radioactive source is introduced to the original site of the stenosis.

A second syringe 22 is also attached to the catheter 12 for injecting contrast dye into the blood vessel to aid in the property location of the catheter. This contrast dye would travel through a conduit 20 also provided on the exterior surface of the catheter to a site 28 near the proximal end of the balloon 18 (see Fig. 1) or could extent of a point 32 beyond the distal end of the balloon 18 (see Fig.2).

[R:\LIBLLJI I 1127specie.doc:keh Alternatively, contrast dye can be introduced to the site of the stenosis by injecting the contrast dye directly into the interior of the catheter 12. This is accomplished utilising a guide wire provided with a removable core, the operation of which will be subsequently explained.

Since the ribbed balloon 18 would inflate in a symmetrical pattern, blood would be allowed to profuse at various locations 34 during both the angioplasty procedure as well as the radiation treatment. This flow of blood would greatly decrease the incidence of a myocardial infarction or a heart attack and would allow the angioplasty procedure as well as the radiation treatment to be performed as long as needed without completely blocking the flow of blood through vessel. As shown in the drawings, the ribbed balloon can be provided with a number of symmetrical lobes which extend for the entire length of the balloon. Each of the lobes is provided with a constant diameter for substantially its entire length.

Since the catheter acts as a conduit to allow a radiation source to be introduced to the site of the original stenosis, the catheter should be sealed at a point proximate to its :distal end, while allowing a guide wire to exit the distal end of the catheter 12.

Consequently, the elastic membrane 40 as shown in Figs. 4, and 6-9 is utilised to perform **this function. This membrane can be constructed of any biocompatible material 44 that will expand large enough to allow the guide wire 16 to pass *e• [R:\LIBLL] I I 127spccie.doclkeh therethrough and then contract to form a closed seal when the guide wire is removed.

Fig. 6 illustrates the elastic membrane which is completely sealed prior to the guide wire passing through this membrane. Fig. 7 illustrates the membrane with a s small hole 46 forming in the middle thereof which would allow the guide wire to pass therethrough as shown in Fig. 8. Fig. 9 illustrates the elastic rnembrane immediately after the guide wire 16 has been removed.

As shown in Fig. 4, more than one elastic membrane 40 can be utilised to insure that the catheter is sealed after the guide wire 16 is removed. Regardless of whether a single membrane or a plurality of membranes are used, the membrane is placed in the interior of the catheter 12 at a location beyond the ribbed balloon 18 in such a manner as to effectively seal the catheter from the blood vessel. Filters 42 can be provided between each of these membranes for wiping the guide wire as it travels through the balloon catheter 12. Because the guide wire 16 extends into the blood vessel, and is then removed from the catheter 12 after the catheter has been manoeuvred to the correct location, it is important that blood or other liquids not be introduced into the sealed portion of the catheter since this would inhibit the proper placement of the radioactive source. The.filtered material 42 can be constructed from any biocompatible material that freely allows the guide wire 16 to pass 20 therethrough as well as wiping the guide wire as it is withdrawn from the catheter 12. Cotton or angel foam have been found to be particularly efficacious for this "purpose.

510aIn place of the elastic membrane 40 a one-way valve 48 is used as shown in Figs. 10 and 12. The one-way 2s valve 48 is placed in the interior of the catheter beyond the ribbed balloon 18. The one way valve is provided with a relatively large flap 50 which is considdrably larger than the hole 54 which it covers. A tension hinge 52 insures that the flap remains in the closed position during the absence of the guide wire 16. In use, as shown in "Fig. 5, the guide wire 16 advances in the direction shown by arrow 56 and the catheter advances in the direction shown by arrow 58. In this instance, as the guide wire passes through the relatively small hole 54, it pushes against the flap, causing S~ the flap to rise and allow passage of the guide wire therethrough. As illustrated in Fig. 5, since the hole 54 is much smaller than the size of the flap 50, the flap can only move in the clockwise direction and not in the counterclockwise direction.

A

"funnel-shaped" entry port 52 assists in allowing the guide wire 16 to pass through the hole 54. If the one-way valve is used in conjunction with at least one of the elastic membranes 40 shown in Fig. 4, filter material 42 can be provided between these two sealing members.

LibfU19713 Figs. 13-15 demonstrate a removable core guide wire 64 which can be used instead of the guide wire 16 illustrated in Figs. 1 and 2. The guide wire 64 is provided with a flexible outer housing 58 which can be constructed from such a material as nitinol. The removable core guide is provided within the Outer housing 58 and includes a soft, flexible, rounded tapered end leader 54 extending beyond one end 61 of the outer housing 58. A slightly oversized cap 56 is provided over the second end 63 of the outer housing 58 to allow the removable core to be removed from the outer housing with the guide wire has been properly positioned within the blood vessel. Once the core is removed, the guide wire would only include the hollow outer housing 58 as well as a series of external threads 60 on the end of the guide wire extending out of the patient's body. This threading would allow a Luer- Lock 62 or similar device to be screwed onto the outer housing 58 so that a syringe can inject contrast dye into the catheter. The removable core can be constructed from PTFE, nitinol or any springy, soft biocompatible material. If the removable guide wire as illustrated in Figs. 13-15 is employed, the conduit 20 shown in Figs.

and 2 used to deliver contrast dy.eto:thevieinity.of the stenosis is not needed.

The balloon catheter as described herein can be utilised in the following manner to treat a 'stenesis-as-welll-s to prevent recurrence of the stenosis. Once the site of a stenosis is determined by appropriate diagnostic 20 procedures, a small incision is made in the body and, assuming that an angioplasty procedure is necessitated, into a vessel. The guide wire 16 is then manoeuvred into the vascular pathway and is imaged under fluoroscopy while being advanced through the blood vessel pass the area of stenosis. The catheter 12, with the balloon 18 being deflated, is threaded over the guide wire 16 and it is also 25 advanced such that the balloon 18 is manoeuvred to the area of the stenosis.

Contrast dye is injected either through the external ports 28, 32 or the specially designed removable core guide wire illustrated in Figs. 13, 14 and 15. The contrast o dye enters the vascular pathway causing the blood vessel to become temporarily opaque and allowing it to be imaged under fluoroscopy.

S 30 Since the contrast media is quickly absorbed by the body, multiple injections o of contrast dye are possible. An opaque marker can be applied to one or both ends of the ribbed balloon 18 allowing it to be imaged under fluoroscopy. Once the ribbed balloon is verified to be in position, the balloon is inflated, the guide wire is 3 withdrawn from the body, and the angioplasty procedure commences.

At this point, the balloon 18 is inflated and deflated one or more times to widen the constricted area. When the balloon is deflated, contrast dye can be injected again to verify the widening of the prior constricted area. The balloon is then inflated to hold the catheter in place for the radioactive treatment.

Lib19713 One or more radioactive sources 38 are provided on, or inside the distal end of a flexible member 36 which is advanced through the interior of the catheter 12 until it reaches the proper location (see Fig. The radioactive source treats the area of the original stenosis for a specific period of time. The time that the source remains inside the catheter depends upon the strength of the radioactive source and the distance between the source and the inner blood vessel walls. Examples of gamma type radiation sources which can be utilised in this procedure would be caesium 137, cobalt 60, iodine 125, iodine 131, cobalt 57, iridium 192, gold 198, palladium 103, etc. Typically, treatment times could last between approximately four minutes to approximately thirty minutes or longer. Since iridium 192 has a well defined energy level with a strength of 1-2 Curies, it is particularly well-suited to treat the area of the original stenosis at the prescribed distance. In this instance treatment times would be in the range of 5 to 10 minutes. After treatment with the radiation source has been completed, both the radiation-source and the catheter with the balloon deflated, are then removed from the body.

Since the radiation source can have a deleterious effect on the body if it is not precisely positioned with respect to the area of treatment, "the radiation source is positioned in the centre of the vessel a predetermined distance from the area of treatment. This is accomplished by °0 o 20 inflating the ribbed balloon 18 when the radiation source is delivered to the proper *000 location. Additionally, for safe measure, the balloon 18 can be inflated at all times when the radiation source is being delivered to the site of the treatment. The positioning of the radiation source with respect to the area of treatment is crucial since next to the radiation source, it is possible to receive thousands of Rads or centiGrays, units of measurement of radiation dose. This dosage woulddTirop to only a few hundred Rads or centiGrays approximately 10mm away from the seurce.

Although the present invention has been explained with respect to an angioplasty procedure, it is noted that this treatment could be conducted in virtually any conduit of the body with or without the inclusion of radiation treatment. This 30 catheter can also be used to treat cancer in various areas of the body, such as the *0o° common bile duct, the bladder, the liver, the lungs, etc. employing the same balloon catheter shown in Figs. 1-15.

There are many instances in the body where cancer invades around and into a vessel-or airway. Treating and controlling the invasion of the cancer is difficult since a sealed prior art catheter having a removable backbone wire on its inside was used to try to access the cancerous area. Since the hollow duct of a vessel or other conduit includes many turns and bend inside the body, the cancerous area could not be reached due to the stiffness of the catheter and the fact that the backbone wire was unable to negotiate the turns. If the backbone wire was Libf19713 removed, the catheter would bunch up and advancement would not be possible. The balloon catheter as described herein avoids these problems since a flexible guide wire is easily manoeuvred into position and the closed-end catheter is advanced over this guide wire giving access to the cancerous area.

With this in mind, the following procedure can be utilised to treat a cancerous area with radiation utilising the catheter, guide wire and sealing means illustrated in Figs.

1-15: The radiopaque guide wire 16 is manoeuvred into position either through a body orifice leading into the hollow duct or an opening created into the hollow duct by means of a small incision or puncture. The radiopaque nature of this guide wire allows X-rays to be used to properly position the guide wire beyond the tumour or cancerous site, which in many ways, is similar in appearance to the stenosis 30 of Fig. 1. The catheter system is then threaded over the guide wire 16 and advanced into position. A radioptic marking on the ribbed balloon 18 makes it easy to position the catheter utilising X-rays. To further confirm position of the catheter, a contrast dye may be injected through either of the s15 external ports 28, 32 or through the removable guide wire illustrated in Figs. 13-15. The balloon catheter is then inflated and the guide wire is removed. The inflation of the balloon is especially valuable if the tumour has invaded the duct or is causing extrinsic compression from outside the duct. The inflation will give temporary relief from the construction, allowing greater passing of bodily fluids. A radioactive source or sources 20 38 contained on the end or inside the end of the flexible drive member 36 (Fig. 4) is o.e° °"advanced inside the catheter to align with the tumour or cancerous area. After a specified time, the radiation and catheter are removed from the body.

The catheter apparatus as described in Figs. 1-15 including the flexible membrane or the one-way valve is very important since, once the guide wire is removed, 25 the system becomes closed, thereby not allowing the radioactive source or sources to advance out the end of a catheter and into the body if they become detached from the drive member 36. Furthermore, similar to what has been described hereinbefore, the inflated ribbed balloon allows body fluids to pass around the catheter. For example, when treating the bile duct, the catheter does not allow passage of the bile, cholecystitis can develop due to the back up of bile into the liver and cause liver dysfunction.

Additionally, when treating the airway of the lung, if the catheter does not allow mucus or air to pass, atelectasis (collapsing of the lobe or the lung) or obstructive pneumonia can develop. This is a very harmful situation to the patient since the patient's lung capacity has already been compromised due to the presence of the cancer.

[R:\LIBLL]I I 127specie.doc:keh -11- Similar to the above, the use of the inflated balloon catheter 18 is helpful in centring the radioactive source or sources inside the hollow duct. Since radiation emission observes the inverse square law, it is quite important that the radioactive source be properly centred because in areas of the body where the walls of the vessels are extremely radiosensitive, such as the bile duct, great harm can be caused to the patient if the source is not centred and kept from the vessel wall. Too much radiation for a period of time in an area proximate to the vessel wall can cause severe haemorrhaging or radiation necrosis.

Fig. 16 illustrates a catheter and guide wire combination previously described, with the exception that a ribbed balloon or other means does not surround a portion of the exterior surface of the catheter. This catheter system is important since, in instances where a cancerous site 70 has invaded the vessel or duct wall 72 to a great extent, it would be very difficult if not impossible to manoeuvre a catheter having a ribbed balloon to the cancerous site. Once the guide wire 16 is removed, the radioactive source or sources is manoeuvred in place in a manner similar to the above-described procedures relating to the treatment of stenosis or cancer.

Figs. 17 and 18 illustrate an embodiment of the present invention in which a membrane or sheath is used to achieve a greater dilation effect while allowing for a better blood profusion and the centring of the treatment source. The ribbed balloon can be 20 provided with a number of symmetrical lobes as previously described. Since plaque or other bodily material can plug the profusion channel or channels between adjacent lobes of the ribbed balloon, it is important that the channels between each of the lobes remain free of this material to allow bodily fluid, such as blood, to pass freely between these channels. This is especially true during an angioplasty procedure.

25 A membrane of sheath 70 which can also be provided would surround the entire ribbed balloon including lobes 71, 72, 73 and 74. this membrane or sheath would extend for either the entire length of the balloon or for a portion of the length of the balloon. Once the balloon is inflated, the membrane of sheath would be pulled tight between the gaps of the balloon lobes as the lobes are inflated.

This particular configuration would result in a greater dilation effect since plaque or other bodily material cannot enter the gap spaces and is forced to move away from the membrane and lobes as expansion takes place due to the inflation of the balloon lobes.

Additionally, a profusion channel or channels are maintained open and bodily fluids will [R:\LIBLL]I I 127specie.doc:keh -12flow freely, since no bodily plaque material can enter the gas spaces to plug or create a damming effect.

The membrane can be constructed from a non-elastic or a non-stretching type of material so a thick overall diameter is achieved when the balloon lobes are inflated.

s Alternatively, the membrane can also be constructed out of an elastic or stretching type of material so that when the balloon lobes are deflated, the membrane will recoil to its original shape and it is guaranteed the balloon lobes will compress to as small of a diameter as possible around the catheter tubing 12. This compression would allow for the balloon catheter when it's in its deflated state to pass through tiny constricted spaces. A stretchable membrane also allows for a thick diameter as long as the membrane cannot be stretched beyond the desired diameter of the inflated lobes.

Alternatively, Fig. 18 illustrates a membrane or sheath which does not surround all of the lobes of the balloon but merely is provided between the lobes. For example, membrane portion 78 is provided between lobes 72 and 74; membrane portion 80 is provided 80 is provided between lobes 74 and 86; membrane portion 84 is provided o: between lobes 86 and 88; and membrane portion 76 is provided between lobes 72 and 88.

o. Similar to the embodiment illustrated with respect to Fig. 17, this membrane can be constructed from a non-elastic or an elastic material. Furthermore, this membrane portion may cover the entire length of the 5 ribbed balloon or a portion of the length of the S. 20 balloon.

.Although preferred forms of the present invention have been herein disclosed, it is to be understood that the present disclosure is made by way of example and that **variation of posture without departing from the scope of the hereinafter 10 claimed subject matter.

Doeo 0 [R:\LIBLL]I I 27specie.doc:keh

Claims (14)

1. A device for treating an occlusion or a constriction in a vessel or other conduit in the body comprising: a flexible, elongated, hollow catheter having a distal end and a proximal end; a ribbed balloon having a distal end and a proximal end encircling a portion of said catheter proximate to said distal end; an inflation conduit associated with the ribbed balloon and an inflation source; and further comprising a membrane or sheath encircling at least a portion of said ribbed balloon.

2. The device in accordance with claim 1, wherein the ribbed balloon defines a number of longitudinal grooves, said grooves extending parallel to said flexible, elongated hollow catheter; said ribbed balloon forming lobes between said longitudinal grooves when inflated by said source for inflating said balloon, and wherein said 15 membrane or sheath encircles at least a portion of at least one of said lobes.

3. The device in accordance with claim 2, wherein said membrane or sheath completely encircles at least a portion of said ribbed balloon.

4. The device in accordance with claim 3, wherein said membrane or sheath comprises an elastic material. 20

5. The device in accordance with claim 2, wherein each of said lobes extend for the entire length of said ribbed balloon and are provided with a constant diameter for substantially its entire length, and wherein said lobes or said membrane or sheath contact the occlusion or constriction for centering said catheter in a vessel or other conduit in the body, while allowing liquid to flow around said lobes through said 25 longitudinal grooves when said ribbed balloon is inflated. 0" 9

6. The device in accordance with claim 1 comprising one of or (ii): further including: a flexible, elongated guide wire manoeuvred to the site of the occlusion or constriction prior to said catheter being manoeuvred to the site of the occlusion or constriction, wherein said guide wire travels through the interior of the catheter, or (ii) further including a sealing means provided in the interior of said catheter between the portion of said catheter encircled by said ribbed balloon and said first aperture for preventing bodily fluids from entering a portion of said catheter. [R:\LIBLL] I I I27specie.doc:keh

7. The device in accordance with claim 6, part further including one of or a means for injecting a contrast dye into the body for determining the location of said catheter and said guide wire in the body; or a sealing means provided in the interior of said catheter between the portion of said catheter encircled by said ribbed balloon and said first aperture for preventing bodily fluids from entering a portion of said catheter.

8. The device in accordance with claim 7, part wherein one of or said guide wire comprises a hollow conduit and an inner core which is removed after said guide wire reaches the site of occlusion or constriction; or further including a second conduit along the exterior surface of said catheter from said proximal end of said catheter to said ribbed balloon, wherein said means for injecting a contrast dye injects contrast dye through said second conduit. s15

9. The device in accordance with claim 8, part wherein said means for see*.: injecting a contrast dye injects contrast dye through said hollow conduit of said guide wire.

10. The device in accordance with claim 8, part wherein one of or (ii): said second conduit terminates at a point adjacent to said proximal end of said ribbed balloon, or (ii) said second conduit terminates at a point adjacent to said distal end of said ribbed balloon.

11. The device in accordance with claim 7, part wherein one of to 25 said sealing means consists of an elastic membrane which allows said guide wire to pass through; or said sealing means consists of a one-way valve provided with a flap and tension hinge which allows said guide wire to pass through; or said sealing means also includes at least one elastic membrane.

12. The device in accordance with claim 11, part wherein said one-way valve is provided with a funnel-shaped entrance to facilitate said guide wire passing through said one-way valve. [R:\LIBLL]1 I 127specie.doclkeh

13. The device in accordance with claim 11, part wherein said sealing means consists of a plurality of elastic membranes separated by a filter.

14. A device for treating an occlusion or a constriction in a vessel or other conduit in the body, substantially as hereinbefore described with reference to Figures 17 and 18. Dated 22 May, 2001 Angiorad, L.L.C. Patent Attorneys for the Applicant/Nominated Person SPRUSON FERGUSON 6@ *0 0 S 00 00 oo*o 0 *.S o 0555 So S 00 [R:\LIBLL]I I 127specie.doc:keh