JPH05123333A - Surgical apparatus for substitution with artificial hip joint - Google Patents

Abstract

PURPOSE:To prevent improper installation of a stem and hinder bone cement from leaking by forming a caldom from a pedestal having a U-form table fitted with flanges, in each of which a groove and screw hole are provided, and a dam part made from a resin flat plate marked with graduation. CONSTITUTION:A caldom C is composed of a pedestal 1 and a dam part 4 consisting of table 2 and resin plate, wherein the dam part 4 is marked with graduation 5. The pedestal 1 is fitted with flanges 3 in the middle and at the two ends of the table 2 which is bent approx. in U form, and a groove 3a and screw hole 3b are provided in each flange. The dam part 4 is made from a flat plate which can be fitted in the grooves 3a and has a circular arc part 6 for supporting A stem of artificial bone and preventing installation at internal reverse position. This permits conducting works of surgical operation simply and precisely and shortens the time for operation.

Description

Detailed Description of the Invention

[0001]

[Object of the Invention]

[0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an instrument for use in artificial hip joint replacement.

[0003]

2. Description of the Related Art In conventional hip arthroplasty, when a stem is inserted into the medullary canal and bone cement is fixed, there is no standard for determining the installation position, so that the stem is inserted parallel to the femoral axis. This is difficult, and in the past, this surgery was performed by relying on experience and intuition.

[0004]

[Problems to be Solved by the Invention] Since the operation depends on the intuition of the operator, the stem may be improperly installed.

FIG. 8 is an explanatory view of a conventional method, in which the stem 10
In this example, the stem axis 12 is inserted on the inversion side with respect to the axis 11 of the femur A. In such a case, the stem may be loosened. However, the inversion of the stem must be avoided.

When cementing the stem into the medullary cavity, the pressure at the time of insertion may cause the bone cement to leak from the opening B and reduce the anchoring effect of the cement on the bone. His finger prevented the leakage of bone cement.

[0007] The present invention is a pre-operative artificial hip arthroplasty that prevents improper placement of the stem and prevents leakage of bone cement and enhances the anchoring effect of the cement on the bone. The surgical instrument (hereinafter referred to as Kalkadam) is a technical subject.

[0008]

[Constitution of the invention]

[0009]

The technical means for solving the problems are as follows.

In a cardamom, which is a surgical instrument used for total hip arthroplasty, the cardam is composed of a pedestal and a dam portion, and the pedestal has flanges at both ends and a central portion of a U-shaped bent table. The artificial hip joint replacement device is provided with a groove and a screw hole in the flange, and the dam portion is made of a resin plate having a transparent or semitransparent scale.

[0011]

[Function] In artificial hip joint replacement, after excavation and reduction of the diaphysis of the femur, the pedestal of the Caldam is attached to the femur with screws,
After trying to insert the artificial bone head, insert the flat plate of the dam into the pedestal and cut and adjust the arc-shaped part that has the scale of the flat plate so that it can be supported at the correct position.After removing the flat plate and the artificial bone, bone cement in the femur. Is injected, the flat plate of the dam part is inserted into the groove of the pedestal, the artificial bone is inserted into the femur, and the artificial bone is supported and fixed in a correct position with bone cement.

In this way, the artificial bone can be supported at the initially planned correct position, and the artificial bone head can be accurately inserted and fixed.

[0013]

EXAMPLES Examples will be described below.

1 to 3 show a state in which the cardam of this embodiment is attached to the femur, where A is the femur, B is the opening for femoral surgery, and C is cardam. 1 is a pedestal, 2 is a pedestal, and 4 is a dam portion made of a resin plate and provided with a scale 5.

The pedestal 1 has flanges 3 arranged at both ends and a central portion of a base 2 which is bent into a substantially U-shape, and is provided with a groove 3a and a screw hole 3b.

The dam portion is composed of a flat plate 4 which can be inserted into the groove 3a of the flange 3 of the pedestal 1 so as to correctly support the stem of the artificial bone and prevent the inversion of the stem. It has an arcuate portion 6 that can be modified, a scale 5 is provided on the resin plate 4, and is made of a transparent or translucent resin (such as polypropylene).

Next, the operation when the above card is used will be described with reference to FIGS.

(1) FIG. 4 shows an excavation of the diaphysis of the femur A using a rasp (not shown). The trial artificial head is used to confirm the insertion condition into the femoral shaft. Reduction is performed at the head of the bone.

(2) In FIG. 5, the pedestal 1 is attached to the femur A 3
It shows the situation of fixing with the screw 7 provided on the flange of the place.

In this state, the artificial head 10 (shown in FIG. 8) is inserted, the resin plate of the dam portion is inserted into the groove 3a of the flange 3 of the pedestal 1, and the circle of the dam portion is placed so that the artificial head is in the correct position. Remove the arc portion 6 by looking at the scale and confirming that the stem can be supported at the correct position, and then remove the dam portion.

(3) As shown in FIG. 6, after the bone cement is injected and the bone cement is filled deep inside the diaphyseal cavity, the flat plate 4 is immediately inserted into the groove 3.
It is in a state where it is fitted in a and the inside of the medullary cavity opening is closed.

(4) FIG. 7 shows that a transparent or semitransparent flat plate 4 with a scale is used to secure a certain distance inside the opening, and to increase the filling degree of the bone cement when inserting the stem, and the bone cement is opened. The situation is shown in which the stem was inserted and fixed with cement while preventing leakage from the.

The bone semmet is blocked from overflowing on the flat plate 4, and is pressed into the porous artificial bone by pressure to be firmly fixed.

[0024]

[Effect] The present invention has the following effects.

The ambiguous surgical operation, which has relied on the experience of the operator so far, can be performed simply and accurately by using this instrument, and the operation time can be shortened.

Also, even for an operator who is not very skilled, there is no mistake in installing the stem, and the cement does not harden and cannot be removed.

Since the time from the filling of the bone cement to the hardening by the polymerization reaction is about 3 minutes, which is a very short time, the surgery is required to be accurate and quick.

This eliminates the need for early re-operation due to uneven wear of the socket of the artificial bone head and loosening of the stem due to installation errors.

Further, by the operation 4, overflow of the bone cement is suppressed, pressure is applied to the inside of the bone, and the inside of the bone is sufficiently filled and anchored.

[Brief description of drawings]

FIG. 1 is an external perspective view of a cardum of this embodiment attached to a femur.

FIG. 2 is a perspective view of a pedestal.

FIG. 3 is an inclined view of a dam portion.

FIG. 4 is a perspective view with the upper part of the femur removed.

FIG. 5 is a perspective view with the pedestal of the femur attached.

FIG. 6 is a perspective view in which a cardam is attached to the femur.

FIG. 7 is a perspective view in which an artificial bone is inserted in the state of FIG.

FIG. 8 is an explanatory diagram of a conventional example.

[Explanation of symbols]

 1 Cardam 2 Pedestal 3 Flange 4 Resin flat plate (dam part) 5 Circular part of resin flat plate 6 Scale 7 Screw 10 Artificial bone

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kazuhiko Sawai 1-15-15 Izumi, Higashi-ku, Aichi Prefecture, Izumi 1-15-15 Izumi Sun Heights (72) Inventor Hiromi Otsuka, 8 Asahigaoka, Meito-ku, Aichi Prefecture San Want Mansion Fujigaoka 102 (72) Inventor Takahiro Yamamoto 29 Hatayama-cho, Seto-shi, Aichi Riverside KENKOH 207 (72) Inventor Yasushi Matsuda 1-1-1 Kawabata-cho, Seto-shi, Aichi 1 Navi Heights Seto 1 Bunkan No. 703 (72) Inventor Tomokazu Hattori 25, Higashiharayama, Nagakute-cho, Aichi-gun, Aichi-gun Ai-gun Fujigaoka Garden No. 2-302

Claims (1)

[Claims] 1. A calca dam, which is a surgical instrument used for total hip arthroplasty, wherein the calca dam comprises a pedestal and a dam portion, and the pedestal is provided with frances at a plurality of locations on a U-shaped pedestal, and the flange is provided with a groove. A device for total hip arthroplasty, in which a screw plate is provided and the dam portion is made of a resin flat plate having a scale.