JPH08308857A - Femur boring guide - Google Patents

Abstract

PURPOSE: To enable a femur cutter guide to be set in a desired position at a femur distal end. CONSTITUTION: This femur boring guide is provided with a holder to be held against the end face of a femur distal end, an alignment bar which has a pin that abuts to a reference point on the front side of the femur distal end and which is horizontally movably mounted on the holder 30, and a base 34 which has a receiving plate 44 that abuts to the rear face of the femur distal end and which is vertically movably mounted on the holder 30 for the sizing of the thickness of the femur distal end sandwiched between the receiving plate 44 and the pin. The femur boring guide further includes a drill guide, in which two right and left guide holes 60 through which to pass a drill for drilling a reference hole in the end face of the femur distal end in order to set a femur cutter guide are formed, and which is attached to the holder 30 by set screws 50 provided in the center of each guide hole, in such a way that the drill guide can be horizontally tilted by a desired angle.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention sets a femoral cutter guide which guides a femoral cutter used for the distal end of the femur during an artificial knee joint attachment operation at a predetermined position of the distal end of the femur. The present invention relates to a femoral hole drilling guide.

[0002]

2. Description of the Related Art When attaching an artificial knee joint or the like to a knee joint,
For the femur, it is necessary to cut the end face of the distal end thereof at right angles to the functional axis, the anterior and posterior faces parallel to each other, and a chamfer of about 45 ° at the intersection, which is a convenient five-side cut. In this case, a saw-like femoral cutter (to be referred to as a cutter hereinafter) that reciprocates along the cut surface to cut the bone is used, but since the cut surface must have high accuracy, the cutter operates as planned. Use the femoral cutter guide to guide the cutter as you do.

FIG. 4 shows this femoral cutter guide (hereinafter,
FIG. 3 is a cross-sectional view showing a usage state of a cutter guide), which is applied to an end face of the distal end 10 of the femur (previously cut at a right angle to a functional axis by another cutter). The plurality of guide bars 14 are provided over the two brackets 12 arranged in parallel, and the positions of the guide bars 14 are regulated so that the front and back surfaces of the cutter 16 come into contact with each other. Then, the inclination angle of the cutter 16 with respect to the distal end 10 of the femur, that is, the cutting plane direction is changed by changing the combination of the guide bars 14 that come into contact with each other.

Therefore, the cutter guide must be set in the correct posture and angle with respect to the distal end 10 of the femur. For this reason, two left and right pins 18 are provided on the bottom surface of the cutter guide, and the pins 18 are set by being inserted into the reference holes 20 formed in the end face of the distal end 10 of the femur. For this reason, the processing accuracy of the reference hole 20 is very important and is usually processed using a drilling guide. This drilling guide is one in which two guide holes for guiding a drill are formed in a member applied to the end face of the femoral distal end 10.

[0005]

However, depending on the degree of the patient's disease and individual differences, it may be necessary to incline (turn) the cut surface reference to the left or right from the functional axis. The processing of the holes must be adapted accordingly. For this reason, the angle is adjusted by biting a spacer or the like on the drilling guide, but such a method requires a large number of spacers, the operation is complicated, and the inclination angle cannot be arbitrarily set. there were. The present invention solves such a problem, and the position of the reference hole can be changed by freely inclining the hole guide with respect to the base member.

[0006]

Under the above-mentioned problems, the present invention has a holder that is applied to the end face of the distal end of the femur and a pin that abuts on the front side reference point of the distal end of the femur. Then, attached to the holder so that it can move horizontally, and an alignment bar,
A femoral cutter guide is set with a base that is attached to a holder so as to be movable up and down in order to size the thickness of the end face of the femur that has a support plate that abuts the posterior surface of the distal end of the femur and that is sandwiched between the support plate and a pin. In order to insert a reference hole in the end face of the distal end of the femur, two left and right guide holes are formed, and a drill that can be attached to the holder so that it can be tilted at any angle by the set screw provided in the center of the guide hole The present invention provides a femoral hole drilling guide including a guide.

[0007]

By using the above means, the drill guide can be tilted with respect to the holder at any angle to the left and right, so the reference hole drilled by the drill guide also corresponds to this, and the cutter guide can be placed in a desired posture, Accurately mounted at an angle.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. 1 is a partial cross-sectional front view of a femoral hole drilling guide (hereinafter referred to as a hole drilling guide) for forming a reference hole for setting a cutter guide, FIG. 2 is a cross-sectional view, and FIG. 3 is a vertical cross-sectional view. , This drilling guide is a holder 30 and
An alignment bar 32 attached to the holder 30,
It consists of a base 34 and a drill guide 36. Of these, the holder 30 is a precut femoral distal end 1
It is a flat plate that is applied to the end face of 0.

The alignment bar 32 is provided on the upper portion of the holder 30 so as to be directed obliquely upward and rearward, and a pin 38, which is applied to the front side reference point A of the distal end 10 of the femur, is projected downward at the tip. Has been done. Since the position of the reference point A differs depending on the skeleton, the pin 38 must be able to move horizontally and adjust its position in FIG. Therefore, the long hole 40 is formed in the center of the alignment bar 32.
Is formed in advance, and is fixed to the holder 30 through the fixing bolt 42. In addition, in order to obtain a reference for the position of the pin 38, a scale is marked on the alignment bar 32 (not shown).

The base 34 has a receiving plate 44 at the lower end which projects rearward and contacts the rear surface of the distal end 10 of the femur, and is attached to the holder 30 so as to be vertically movable in FIG. Specifically, a guide groove 46 is formed in the holder 30 in the vertical direction so that the guide groove 46 can be moved up and down by using the guide groove. A U-shaped groove 48 having an open upper end is formed in the base 34, and a set screw 50 is inserted into the U-shaped groove 48 to be fixed to the holder 30. In this way, the receiving plate 44 and the pin 38 sandwich the distal end 10 of the femur, and the thickness thereof necessary for selecting an artificial knee joint is sized. In addition, in order to easily distinguish the size of the thickness,
Scales such as L, M, and S are marked on the base 34.

The drill guide 36 has wing-shaped bodies 52 on the left and right, and is provided in a state in which it is in contact with the holder 30 by allowing the portion of the base 34 to escape and be tilted left and right around the set screw 50. . An arcuate elongated hole 54 is formed in the upper part around the set screw 50, and a fixing screw 56 is passed through the elongated hole 54 to hold the holder 30.
It can be fixed to. As a result, the drill guide 36 can be tilted to the left and right around the fixing screw 50, so that it can be set at an arbitrary angle. In order to read the tilt angle at this time, a scale 58 such as 1 ° is formed in the range of ± 10 ° in the portion of the holder 30 where the upper end of the drill guide 36 is located. Furthermore,
A guide hole 60 through which a drill can be inserted is formed in the portion of the wing-shaped body 52 at a position symmetrical to the left and right from the set screw 50. A relief hole 62 through which a drill can be inserted is also formed.

From the above, the holder 30 is applied to the end surface of the distal end 10 of the femur, and the pin 3 of the alignment bar 32 is applied.
8 is applied to the reference point A, and the base 34 is moved up and down to bring the receiving plate 44 into contact with the rear surface thereof to size the thickness of the distal end 10 of the femur sandwiched by the pin 38 and the receiving plate 44. At this time, when it is necessary to incline the drill guide 36 due to the bone condition or the like, the drill guide 36 is inclined at a required angle and the fixing screw 56 is tightened to fix it at this position. When this operation is completed, a reference hole is drilled in the end face through the drill from the guide hole 60. Then, the drilling guide is removed and the cutter guide is attached to the reference hole, which means that the preoperative work is completed.

[0013]

As described above, since the present invention is as described above, the reference hole for attaching the cutter guide can be formed at an optimum position according to the degree of illness of the patient and individual differences. . The change angle is stepless and can be set in a large range, and the operation is easy.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional front view of a femoral hole drilling guide showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a femoral drilling guide showing an embodiment of the present invention.

FIG. 3 is a longitudinal sectional view of a femoral hole drilling guide showing an embodiment of the present invention.

FIG. 4 is an explanatory view showing a state where a cutter guide is attached.

[Explanation of symbols]

 10 distal end of femur 20 reference hole 30 holder 32 alignment bar 34 base 36 drill guide 38 pin 44 receiving plate 50 set screw 60 guide hole A reference point

Claims (2)

[Claims] 1. A holder that is applied to the end face of the distal end of the femur, and an alignment bar that is attached to the holder so as to be horizontally movable and that has a pin that abuts on a front side reference point of the distal end of the femur. A femoral cutter guide is set with a base that is attached to a holder so as to be movable up and down in order to size the thickness of the end face of the femur that has a support plate that abuts the posterior surface of the distal end of the femur and that is sandwiched between the support plate and a pin. In order to insert a reference hole in the end face of the distal end of the femur, two left and right guide holes are formed, and a drill that can be attached to the holder so that it can be tilted at any angle by the set screw provided in the center of the guide hole Femoral hole drilling guide consisting of a guide. 2. The femoral drilling guide according to claim 1, wherein the inclination angle of the drill guide is 10 ° on the left and right.