CN103976808A - Unicondylar arthroplasty femoral prosthesis implantation indicator - Google Patents

Abstract

The invention relates to a femoral prosthesis implantation indicator for unicondylar replacement, which comprises an indicator block, a telescopic rod and a fixed block, the lower end of the telescopic rod is fixedly arranged in the fixed block, and the upper end of the telescopic rod is connected to one side of the indicator block to indicate The block moves up and down relative to the fixed block through the telescopic rod. The telescopic rod includes an inner rod and an outer rod. The inner rod is sleeved inside the outer rod. The inner rod and the outer rod are connected by threads. The inner rod can move up and down relative to the outer rod When the inner rod moves, the indicating block is driven to move up and down. The unicompartmental replacement femoral prosthesis implantation indicator using this structure directly relies on the positioning method to pre-install the prosthesis outside the body during the operation, which can judge the position of the prosthesis more intuitively, and facilitate the operation. It can be used in conjunction with the indicator block, with a direct plug-in design and easy operation; the indicator adopts a retractable design, and the inner rod can move up and down relative to the outer rod, so that it can be used in different soft tissue thicknesses.

Description

Unicompartmental replacement femoral prosthesis implantation indicator

technical field

The invention relates to the technical field of medical devices, in particular to an indicator for implanting a unicompartmental replacement femoral prosthesis.

Background technique

At present, for unicondylar knee arthroplasty (UKA, unicondylar knee arthroplasty), the accurate selection of the size of the prosthesis will ultimately affect the surgical effect and long-term survival rate of the prosthesis. Due to minimally invasive surgery, it is difficult to do it as in total knee arthroplasty. The alignment of the femoral prosthesis was accurately implanted. The current commonly used methods (intramedullary/extramedullary/non-medullary) mostly indicate the direction of the force line, and the implantation position is often poor due to the operator's surgical experience and visual errors.

Contents of the invention

The object of the present invention is to overcome the above-mentioned shortcomings in the prior art, and provide a unicompartmental replacement femoral prosthesis implantation indicator which is easy to operate, easy to replace during operation, and applicable to different soft tissue thicknesses.

In order to achieve the above-mentioned purpose, the unicompartmental femoral prosthesis implantation indicator of the present invention adopts the following technical solutions:

The main feature of the unicompartmental replacement femoral prosthesis implantation indicator is that it includes an indicator block, a telescopic rod and a fixed block, the lower end of the telescopic rod is fixedly arranged in the fixed block, and the telescopic rod The upper end is connected to one side of the indication block, and the indication block moves up and down relative to the fixed block through the telescopic rod.

The fixed block in the unicompartmental replacement femoral prosthesis implantation indicator has two guide pin insertion holes, the guide pin insertion holes are matched with the guide pins, and one of the guide pin insertion holes is The hole is located at the upper part of the fixed block, and the other introducer needle insertion hole is located at the lower part of the fixed block.

The telescopic rod in the unicompartmental replacement femoral prosthesis implantation indicator includes an inner rod and an outer rod, and the inner rod is movably sleeved inside the outer rod, and the inner rod is relative to the outer rod. The rod moves up and down, the bottom of the outer rod is fixedly connected with the fixed block, and the upper end of the inner rod is fixedly connected with the indicating block.

The upper end of the inner rod in the unicompartmental replacement femoral prosthesis implantation indicator is also provided with a nut, and the inner rod is threadedly connected with the nut.

The edge of the indicator block in the unicompartmental replacement femoral prosthesis implantation indicator is provided with arc chamfering.

The unicompartmental replacement femoral prosthesis implantation indicator using this structure directly relies on the positioning method to pre-install the prosthesis outside the body during the operation, which can judge the position of the prosthesis more intuitively and facilitate the operation. It can be used in conjunction with the indicator block, with a direct plug-in design and easy operation; the indicator can be retracted to facilitate use in different soft tissue thicknesses.

Description of drawings

Fig. 1 is a schematic diagram of the implantation indicator of the unicompartmental replacement femoral prosthesis of the present invention.

Figure 2 is a schematic diagram of the inner rod being pulled out from the outer rod.

The symbols in the figure are explained as follows:

1 indicator block

2 telescopic poles

21 inner rod

22 outer pole

3 fixed blocks

31 Guide pin insertion hole

4 nuts

Detailed ways

In order to understand the technical content of the present invention more clearly, the following examples are given in detail.

Please refer to the accompanying drawings, the unicompartmental replacement femoral prosthesis implantation indicator includes an indicator block 1, a telescopic rod 2 and a fixed block 3, the lower end of the telescopic rod 2 is fixed in the fixed block 3, and the upper end of the telescopic rod 2 is connected to the indicator One side of the block 1 is connected, and the indicating block 1 moves up and down relative to the fixed block 3 through the telescopic rod 2 .

The fixed block 3 has two guide needle insertion holes 31, the guide needle insertion holes 31 are matched with the guide needles, one guide needle insertion hole 31 is located on the upper part of the fixed block 3, and the other guide needle is inserted into the The hole 31 is located at the lower part of the fixing block 3 .

The inner rod 21 is sleeved inside the outer rod 22, the bottom end of the outer rod 22 is fixedly connected with the fixed block 3, the upper end of the inner rod 21 is fixedly connected with the indicating block 1, and the upper end of the nut 4 and the inner rod 21 is threaded. Rotating the nut 4 can screw the inner rod 21 into the outer rod 22 or screw it out from the outer rod 22 .

The edge of the indicating block 1 is provided with arc chamfering.

The unicompartmental replacement femoral prosthesis implantation indicator using this structure directly relies on the positioning method to pre-install the prosthesis outside the body during the operation, which can judge the position of the prosthesis more intuitively and facilitate the operation. It can be used in conjunction with the indicator block, with a direct plug-in design and easy operation; the indicator can be retracted to facilitate use in different soft tissue thicknesses.

In this specification, the invention has been described with reference to specific embodiments thereof. However, it is obvious that various modifications and changes can be made without departing from the spirit and scope of the invention. Accordingly, the specification and drawings are to be regarded as illustrative rather than restrictive.

Claims (5)

1. a kind of unicompartmental replacement femoral prosthesis implantation indicator, it is characterized in that, comprise indicator block, telescopic rod and fixed block, the lower end of described telescopic rod is fixedly arranged in described fixed block, described telescopic rod The upper end of the rod is connected to one side of the indicating block, and the indicating block moves up and down relative to the fixed block through the telescopic rod. 2. unicompartmental replacement femoral prosthesis implant indicator according to claim 1, is characterized in that, described fixation block has two guide pin insertion holes, described guide pin insertion hole and guide pin insertion hole The guide pins are matched, one guide pin insertion hole is located at the upper part of the fixed block, and the other guide pin insertion hole is located at the lower part of the fixed block. 3. The unicompartmental replacement femoral prosthesis implantation indicator according to claim 1, wherein said telescopic rod comprises an inner rod and an outer rod, and said inner rod is movably sleeved on said outer rod Inside, the inner rod moves up and down relative to the outer rod, the bottom of the outer rod is fixedly connected to the fixed block, and the upper end of the inner rod is fixedly connected to the indicating block. 4 . The implantation indicator for unicompartmental femoral prosthesis replacement according to claim 3 , wherein a nut is provided on the upper end of the inner rod, and the inner rod is threadedly connected with the nut. 5. The implantation indicator for unicompartmental femoral prosthesis replacement according to claim 1, characterized in that, the edge of the indicator block is provided with arc chamfering.