CN211610108U - Knee joint flexion clearance distance measurement balance positioning tool - Google Patents

Abstract

The utility model discloses the application belongs to medical equipment technical field, specifically discloses a balanced positioning tool of knee joint bucking clearance range finding, including the columniform platform base main part that has scale and liftable pivot, sliding connection has the vice main part in location that can fix a position in the platform base main part, still can dismantle in the platform base main part and be connected with the intramedullary fixed part of taking the decompression slot. The scheme is mainly used for knee joint flexion gap balance distance measurement, and solves the problem that flexion gap balance cannot be positioned to cause errors in osteotomy measurement.

Description

Knee joint flexion clearance distance measurement balance positioning tool

Technical Field

The utility model belongs to the technical field of medical equipment, a knee joint bucking clearance range finding balanced positioning tool is specifically disclosed.

Background

In conventional knee arthroplasty, achieving equal flexion and extension gaps through osteotomies of the femur and tibia is considered to be "ideal". The error between the mean value of the extension gap and the flexion gap is also less than 1mm for the most recently emerging navigation-assisted measurement resection. It is believed that in PS prostheses, a large flexion gap of up to 3mm and a residual lateral relaxation of up to 5 ° can be accepted. In clinical surgery, the authors found that when flexion gap balancing is performed, if external rotation positioning is performed using a measured osteotomy, the following are encountered: 1. posterior condylar defect; 2. resection of cruciate ligament; 3. when the femoral condyle becomes different, a measurement osteotomy method has larger error, and equal flexion and extension gaps cannot be realized.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a knee joint bucking clearance range finding balanced positioning tool to solve the balanced unable location in bucking clearance and measure the problem that causes the error to cutting the bone.

In order to achieve the above purpose, the technical scheme of the utility model is that: the utility model provides a knee joint flexure gap range finding balanced positioning tool, is including the columniform platform base main part that has scale and liftable pivot, and sliding connection has the vice main part in location that can fix a position on the platform base main part, still can dismantle the intramedullary fixed part who is connected with the area decompression slot on the platform base main part.

The working principle of the technical scheme is as follows: before using the tool, the straightening gap osteotomy is completed, and the tool template is used as a gap height reference. The knee joint is bent, the platform base main body is placed at the osteotomy tibial platform, the positioning auxiliary main body is sleeved into the platform main body, and the intramedullary fixing part is placed in a femoral medullary cavity through the positioning hole and fixes the components. The lifting pivot is adjusted to lift the fixing part in the femoral bone marrow, the tension of the collateral ligaments on two sides is balanced under the lever action, and the height of the gap after osteotomy can be read according to the scale. And determining the height of the required flexion gap by taking the extension gap height as a reference and integrating the tension balance condition of the bilateral ligaments. And (4) placing the fixing nails into the fixing nail holes on the two sides, removing the balance distance measuring device, and replacing the bone cutting guide plate to complete the bone cutting of the buckling gap.

The beneficial effects of this technical scheme lie in:

(1) the scheme is used for obtaining the balanced equidistant buckling clearance in the total knee joint replacement; bilateral ligament balance is realized through leverage; through the vice main part of activity location, can refer to the height that the bucking clearance was accurately set for in the extension clearance. The scheme can effectively combine and fully exert the advantages of two methods of bone cutting measurement and bone cutting balance.

(2) The utility model discloses it all has good application in knee joint enstrophe deformity, valgus deformity and bucking contracture to find range the equalizer at bucking clearance. The utility model discloses in, the bucking clearance range finding balancer calculates from the tibial plateau, does not rely on thighbone postcondylar to the final purpose of design bucking clearance range finding balancer is that the help surgeon obtains the rectangle bucking clearance that is on a parallel with the tibial plateau and equals with straightening the clearance.

(3) The scheme has more universality and popularization for the traditional measurement resection technology and the navigation assistance technology and the buckling clearance distance measurement balancer.

Further, platform base main part includes vertical sleeve, lift pivot and rotation regulation handle, and the sleeve lower extreme is connected with the horizontally butterfly piece, and the sleeve lower part is equipped with oval logical groove, and the lift pivot is located the sleeve and with rotation regulation handle threaded connection, and the locating hole has been seted up to lift pivot lower part.

Further, the auxiliary body comprises an annular auxiliary body circular ring, the auxiliary body circular ring is connected with the sleeve in a vertical sliding mode, the lower portion of the auxiliary body circular ring is connected with a vertical square long column, a nail hole is formed in the lower portion of the square long column, and a fixing nail is connected in the nail hole in a sliding mode.

Furthermore, the intramedullary positioning part comprises an intramedullary positioning rod and a positioning rod locking sleeve, the positioning rod locking sleeve is sleeved on the part of the lifting pivot, and the intramedullary positioning rod can extend into the positioning hole.

Further, the upper portion of the rotation adjusting handle is provided with a plurality of grooves along the circumferential direction, and the grooves are arranged along the length direction of the rotation adjusting handle. Through the arrangement, the rotary adjusting handle is convenient to rotate.

Further, a plurality of ring channels have been seted up along length direction on sleeve upper portion, are equipped with the telescopic button on the vice main part ring, and the button is close to the one end of vice main part ring inner wall and is connected with the locating plate, is equipped with the annular arch with the ring channel adaptation on the locating plate.

Drawings

Fig. 1 is a schematic structural view of an embodiment of a knee joint flexion gap distance measuring and balancing positioning tool of the present invention;

FIG. 2 is a schematic view of the platform base body and intramedullary fixation portion of FIG. 1 after attachment;

fig. 3 is a schematic structural view of the intramedullary fixing portion of fig. 1.

Detailed Description

The following is further detailed by way of specific embodiments:

reference numerals in the drawings of the specification include: the adjustable positioning device comprises a rotary adjusting handle 1, a sleeve 2, a lifting pivot 3, a positioning cylinder 4, a butterfly-shaped sheet 5, an auxiliary main body ring 6, a square button 7, a square long column 8, a fixing nail hole 9, a positioning rod locking sleeve 10, an intramedullary positioning rod 11, a fixing nail 12, a groove 13 and a through groove 14.

In this embodiment, as shown in fig. 1, fig. 2 and fig. 3, a knee joint flexion gap distance measurement balance positioning tool includes a cylindrical platform base main body with a scale and a lifting pivot 3, a positioning pair main body capable of positioning is slidably connected to the platform base main body, and an intramedullary fixing portion with a pressure reduction groove is detachably connected to the platform base main body.

Referring to fig. 1, in the present invention, the platform base main body includes a vertical sleeve 2, a lifting pivot 3 and a rotation adjusting handle 1, and scales are located on two sides of the lower portion of the sleeve 2; the lower end of the sleeve 2 is connected with a horizontal butterfly-shaped sheet 5, and the lower part of the sleeve 2 is provided with an oval through groove 14. A plurality of grooves 13 are arranged on the upper portion of the rotary adjusting handle 1 along the circumferential direction, and the grooves 13 are arranged along the length direction of the rotary adjusting handle 1.

The lifting pivot 3 is positioned in the sleeve 2 and is in threaded connection with the rotary adjusting handle 1, the lower part of the lifting pivot 3 is connected with a positioning cylinder, and a positioning hole is formed in the positioning cylinder. The auxiliary body comprises an annular auxiliary body circular ring 6, the auxiliary body circular ring 6 is connected with the sleeve 2 in a vertical sliding mode, the lower portion of the auxiliary body circular ring 6 is connected with a vertical square long column 8, a fixing nail hole 9 is formed in the lower portion of the square long column 8, and a fixing nail 12 is connected in the fixing nail hole 9 in a sliding mode. The intramedullary positioning part comprises an intramedullary positioning rod 11 and a positioning rod locking sleeve 10, the positioning rod locking sleeve 10 is sleeved on the part of the lifting pivot 3 in a sliding way, and the intramedullary positioning rod 11 can extend into the positioning hole. A plurality of ring channels have been seted up along length direction on 2 upper portions of sleeve, and processing has the square button 7 of telescopic on the vice main part ring 6, presses square button 7 and can remove vice main part ring 6 and play the positioning action, and this positioning action principle is the same with the positioning principle of shower support among the prior art on the shower pole, belongs to prior art.

The specific implementation process is as follows: in the total knee replacement operation, the equal flexion gap and extension gap and the balanced tension of the medial and lateral collateral ligaments are important guarantees of stable joint and long service life of prosthesis. This is determined by two factors, the amount of femoral external rotation and osteotomy. After the distal femoral resection and the tibial plateau resection are completed, the extension gap height is substantially determined. At this time, the extension gap height, which is the target height for which the flexion gap between the femoral posterior condyle and the tibial plateau needs to be cut out, is measured with the tool template. Removing osteophyte and avoiding soft tissue impact, wherein the femoral medullary opening point is positioned 3-5mm away from the inner side of the top point of the intercondylar notch, namely 7-10mm in front of the starting point of the posterior cruciate ligament. According to the extension gap height, the balancer main body and the auxiliary main body are assembled, the knee joint bends 90 degrees, and the main body base platform is placed on the tibia platform with the cut bone. The position of the positioning hole in the femoral bone marrow is adjusted to coincide with the medullary opening point by rotating the rotary adjusting handle 1, and the positioning rod 11 is inserted into the femoral bone marrow. The rotating adjusting handle 1 is rotated again to lift the locating hole in the femoral bone marrow, and then the intramedullary locating rod 11 is driven to lift the distal end of the femur, so that the inner collateral ligament and the outer collateral ligament are gradually tensioned until the tension is balanced, and at the moment, the connecting line of the fixing nail holes 9 on the two sides determines the external rotation angle of the femur. The auxiliary main body can be adjusted to slide up and down, the upper grooves 13 of the square columns on the two sides of the auxiliary main body correspond to scale marks according to scale marks on the scales on the two sides of the front window of the lower half part of the main body, and the numerical value is selected to be the distance from the lower horizontal line of the square columns on the two sides of the auxiliary main body to the base of the main platform and is also the height of a buckling gap. Two screws are put into the nail holes, and the distance measuring balancer is taken down, so that the bone cutting guide plate can be installed for bone cutting.

The utility model has the advantages that: the method has the advantages that the balanced equidistant buckling gaps in the total knee replacement can be obtained, and the advantages of the bone cutting measurement method and the bone cutting balance method can be effectively combined and fully exerted. The intramedullary nail is mainly composed of an intramedullary fixing rod, a cylindrical main body with a scale and a movable auxiliary main body with a nail hole, wherein the base of the main body is placed on a prepared tibial plateau, and the scale for measuring the thickness of a gasket is carved on two sides of the middle-lower section of the cylindrical main body. The movable sub-body is provided with staple holes 9 on both sides for respective staples 12. The intramedullary fixation rod is placed in the middle of the femoral intercondylar condyle. The staple hole 9 location ranges in the femoral posterior condyles. The flexion gap distance measurement balancer has good application in knee joint varus deformity, valgus deformity and flexion contracture. The flexion gap distance measurement balancer is independent of the femoral posterior condyles from the tibial plateau, and can accurately set the size of the flexion gap. The ultimate goal in designing a flexion gap ranging balancer is to help the surgeon achieve a rectangular flexion gap parallel to the tibial plateau and equal to the extension gap. Realizes the equal tension balance of the inner ligament and the outer ligament, and reduces the displacement of the femoral prosthesis at the flexion position to the maximum extent.

The above description is only an example of the present invention, and the common general knowledge of the known specific structures and characteristics of the embodiments is not described herein. It should be noted that, for those skilled in the art, without departing from the structure of the present invention, several modifications and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicability of the patent.

Claims (6)

1. The utility model provides a knee joint flexure gap range finding balanced positioning tool which characterized in that, including the columniform platform base main part that has scale and liftable pivot, sliding connection has the vice main part in location that can fix a position on the platform base main part, still can dismantle the intramedullary fixed part that is connected with the area decompression slot on the platform base main part.

2. The knee joint flexion gap distance measuring, balancing and positioning tool according to claim 1, wherein the platform base body comprises a vertical sleeve, a lifting pivot and a rotation adjusting handle, a horizontal butterfly-shaped piece is connected to the lower end of the sleeve, an oval through groove is formed in the lower portion of the sleeve, the lifting pivot is located in the sleeve and is in threaded connection with the rotation adjusting handle, and a positioning hole is formed in the lower portion of the lifting pivot.

3. The knee joint flexion gap distance measuring, balancing and positioning tool according to claim 1, characterized in that the auxiliary body comprises an annular auxiliary body ring, the auxiliary body ring is vertically slidably connected with the sleeve, a vertical square long column is connected to a lower portion of the auxiliary body ring, a nail hole is formed in a lower portion of the square long column, and a fixing nail is slidably connected in the nail hole.

4. The knee joint flexion gap distance measuring and balancing positioning tool according to claim 2, wherein the intramedullary positioning portion includes an intramedullary positioning rod and a positioning rod locking sleeve, the positioning rod locking sleeve is sleeved on the portion of the lifting pivot, and the intramedullary positioning rod can extend into the positioning hole.

5. The knee joint flexion gap distance measuring and balancing positioning tool according to claim 2, wherein the upper portion of the rotation adjustment handle is circumferentially provided with a plurality of grooves, and the grooves are arranged along the length direction of the rotation adjustment handle.

6. The knee joint flexion gap distance measuring and balancing positioning tool according to claim 3, wherein a plurality of annular grooves are formed in the upper portion of the sleeve along the length direction, the auxiliary body ring is provided with a retractable button, a positioning plate is connected to one end of the button, which is close to the inner wall of the auxiliary body ring, and an annular protrusion matched with the annular grooves is formed in the positioning plate.

Images