JP2002102236A - Drill guide for patella - Google Patents

Abstract

PROBLEM TO BE SOLVED: To drill a precision hole into the patella accurately. SOLUTION: The position and direction are established by clasping the patella from both sides, and the precision of the depth is achieved by adjusting a movable cylinder.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention processes a hole for inserting and attaching an artificial ligament to a patella at the time of ligament reconstruction using an artificial ligament when the living ligament fixing the patella is damaged or torn. Equipment related.

[0002]

2. Description of the Related Art There is no dedicated drill guide for drilling a hole for inserting an artificial ligament into a patella, and the surgeon directly drills the hole and determines its position and depth based on experience and intuition.

[0003]

Drilling a hole in a bone is not less than invasive to a patient. In order to attach the artificial ligament to the patella with the minimum invasiveness, drilling accuracy is required. If a hole is drilled based on the experience and intuition of the surgeon, the position, depth, and directionality are not determined, and there is a possibility that the bone is scraped to an unnecessary part.

[0004]

In order to achieve the above-mentioned object, the technical means adopted by the present invention is to position and fix the patella by sandwiching and fixing the patella by the main body and the movable arm.
The direction is established, the movable cylinder is used to establish the depth, and the operator can easily drill a high precision drill hole.

[0005]

Embodiments of the present invention will be described below with reference to the drawings. The movable arm 1 in FIG. 1 has a loose L-shape, and the main body 2 has a symmetrical shape with the tip of the movable arm so as to straddle and sandwich the patella. Translates through the square hole located at and pinches the patella. If pinching is performed without the patella, the square hole on the main body side will cut into the L-shaped curve of the movable arm 1. To prevent this, the movable arm 1 is provided with a stopper 11. In addition, since medical devices require cleaning after surgery, a detachment screw 10 is provided at the rear end of the movable arm 1 so that the movable arm 1 can be completely removed from the main body 2 by removing the screw. Can be washed into square holes. As materials for the movable arm 1, the main body 2, and other parts, stainless steel SUS304, 316, 420, titanium 6-4 alloy, or the like, which is highly suitable as a medical device, is suitable.

The movable arm 1 is provided with a continuous groove 5 on the bottom surface, and the claw 6 at the tip of a release lever 8 is continuously engaged with and locked. As shown in FIG. 2, a leaf spring 13 is attached to the inside of the main body. When the patella is moved in a direction to pinch the patella, the patella is automatically engaged. , Nail 6 to continuous groove 5
Pull away from.

The distal end of the movable arm 1 is provided with a claw 4a for fixing the front part of the patella, and the distal end is divided into three and sharpened. In particular, the lower part is long and penetrates the skin and muscle tissue and cuts into the lower patella. A claw 4b is attached to the lower portion of the main body 2, and the tip is divided into four parts, which are also sharply processed. This side is pressed directly against the exposed patella, so the nail length is adjusted to the shape of the bone. The patellar bone is firmly fixed by the claws on both sides.

Since the size of the patella varies from patient to patient,
The depth of the drilled hole also needs to be adjusted to its size. As shown in FIG. 3, a claw 4a and a claw 4b are provided on the movable arm 1.
A scale 12 indicating the distance to the mark is shown. This allows
The surgeon can know the width of the patient's patella.

The movable cylinder 3 is inserted into the lower part of the main body and moved back and forth to adjust the depth of the hole. A scale 14 indicating the depth of the movable cylinder 3 is marked on a side surface of the movable cylinder 3, and the depth is determined by a numerical value obtained from the scale 12. The position of the movable cylinder 3 is fixed by a set screw 15. If a drill with a stopper is used at a fixed position as shown in FIG. 4, the accuracy of the depth of the hole becomes higher.

When the patella is inserted, the nail 4a, the nail 4
When the part b is gripped, the movable arm 1 bends, making it difficult to slide. For smooth clamping, a force should be applied near the sliding part. For that purpose, the movable arm 1 and the grip plate 9 a
It is effective to attach 9b and 9c. Furthermore, if the shape of the grip plate is curved, it fits easily with the finger and is easy to pinch.

[0011]

The drill guide according to the present invention enables a surgeon to easily establish the position, depth, and direction when drilling a drill hole for attaching an artificial ligament to a patella, thereby making unnecessary invasion of a patient. Can be significantly reduced.

[Brief description of the drawings]

FIG. 1 is a schematic view showing an embodiment of a drill guide according to the present invention.

FIG. 2 is a longitudinal sectional view showing an embodiment of a drill guide according to the present invention.

FIG. 3 is a top view showing an embodiment of the drill guide according to the present invention.

FIG. 4 shows a drill with a stopper.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Movable arm 2 Main body 3 Movable cylinder 4a, 4b Claw 5 Continuous groove 6 Claw 7 Drill hole 8 Release lever 9a, 9b, 9c Grip plate 10 Removal screw 11 Stopper 12 Scale 13 Leaf spring 14 Cylinder scale 15 Stop screw

Claims (1)

[Claims] 1. A ligament reconstruction operation using an artificial ligament when a living ligament fixing a patella is damaged or ruptured,
An instrument used to machine a hole for inserting and attaching an artificial ligament to the patella.The movable arm moves in parallel through the square hole in the main body, and the patella is sandwiched between the main body and the movable arm. When moving in the direction of tightening, the movable arm has a continuous groove,
The nail on the main body side enters and locks it, and when releasing from the patella, it is released by pressing the release lever, and the movable arm has a scale to measure the width of the patella sandwiched, and the movable arm The arm and the main body are each equipped with a claw for biting the patella, and a grip plate attached to the horizontal position of both the movable arm and the main body to facilitate the operation of pinching the main body by hand, A patella drill guide, characterized in that the body has a movable cylinder for adjusting the depth of a hole drilled in the patella.