CN213406325U

CN213406325U - Accurate pre-measurement tool in total knee joint replacement

Info

Publication number: CN213406325U
Application number: CN202021706733.4U
Authority: CN
Inventors: 钱文伟; 王一鸥; 朱诗白; 陈曦; 李姗妮
Original assignee: Peking Union Medical College Hospital Chinese Academy of Medical Sciences
Current assignee: Peking Union Medical College Hospital Chinese Academy of Medical Sciences
Priority date: 2020-08-17
Filing date: 2020-08-17
Publication date: 2021-06-11
Anticipated expiration: 2030-08-17

Abstract

The utility model discloses an accurate pre-measurement instrument in total knee joint replacement art, include: the first end of the main ruler is provided with a plate-shaped first outer measuring claw; and the vernier is slidably attached to the main ruler, one end, close to the first end of the main ruler, of the vernier is provided with a second plate-shaped outer measuring claw, the length of the first outer measuring claw is larger than that of the second outer measuring claw, the first outer measuring claw and the second outer measuring claw respectively comprise a first inner plate surface and a second inner plate surface which are in contact with a part to be measured, the first inner plate surface and the second inner plate surface are perpendicular to the ruler surface of the main ruler, and the perpendicular distance D1 between the first inner plate surface and the zero scale mark of the main ruler is equal to the perpendicular distance D2 between the second inner plate surface and the zero scale mark of the vernier. The utility model discloses can cut the back at four unifications and cut the installation of bone module, accurately the thickness that measures thighbone postcondylar osteotomy, verify mutually with plan before the art, can in time adjust before the implementation of cutting the bone, avoid directly cutting the bone and appear the osteotomy that can't compensate misalignment.

Description

Accurate pre-measurement tool in total knee joint replacement

Technical Field

The utility model relates to a medical measuring tool technical field, concretely relates to accurate pre-measurement instrument in total knee joint replacement art.

Background

In total knee replacement using measured osteotomy, equivalent osteotomy is the basis for achieving knee gap balance and good patellofemoral track, with the most important being the accurate resection of the posterior condyle. However, at present, when the installation position of the four-in-one osteotomy module is determined according to anatomical landmarks in an operation, the osteotomy is performed, the posterior condylar osteotomy amount cannot be pre-measured, and the osteotomy is easily misaligned.

The two outer measuring claws clamp the object to be measured by using the existing vernier caliper, so that the outer diameter of the object can be measured. However, the existing vernier caliper has the following defects: 1. the external measuring claw is too thick, and needs to be inserted into the osteotomy groove of the osteotomy module to realize accurate pre-measurement, but the height of the osteotomy groove is only 1.5-2.0 mm; 2. the outer measuring claw is too narrow, and the difficulty of searching the highest/low point on the selected plane is increased by the too narrow outer measuring claw; 3. the external measurement jaws are too short and there is no length difference between the two jaws, and in the pre-measurement, the length difference of the two external measurement jaws needs to exceed at least the radius of the femoral posterior condyles. Therefore, the conventional vernier caliper can only measure the thickness of the osteotomy posterior bone block, and cannot pre-measure the osteotomy thickness of the femoral posterior condyle before osteotomy.

In view of the above problems in the prior art, there is a need in the art for a vernier caliper capable of measuring the resection thickness of the posterior condyle of the femur in advance before the real resection after the four-in-one resection module is installed during the artificial total knee replacement.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model provides an aim at provides an accurate pre-measurement instrument of thighbone postcondylar osteotomy thickness in total knee joint replacement art can solve prior art and can't really measure thighbone postcondylar osteotomy thickness scheduling problem before the osteotomy is accomplished in the installation of four unification osteotomy modules when carrying out artifical total knee joint replacement art.

Based on the above-mentioned purpose, an aspect of the embodiments of the present invention provides an accurate pre-measurement tool in total knee replacement, include:

the first end of the main scale is provided with a plate-shaped first outer measuring claw, and the main scale and the first outer measuring claw form a first L-shaped structure; and

the vernier is slidably attached to the main ruler, one end, close to the first end of the main ruler, of the vernier is provided with a plate-shaped second outer measuring claw, the vernier and the second outer measuring claw form a second L-shaped structure,

the length of the first outer measuring claw is greater than that of the second outer measuring claw, the first outer measuring claw comprises a first inner side plate surface in contact with a part to be measured, the second outer measuring claw comprises a second inner side plate surface in contact with the part to be measured, the first inner side plate surface and the second inner side plate surface are perpendicular to the ruler surface of the main ruler, and the perpendicular distance D1 between the first inner side plate surface and the zero scale line of the main ruler is equal to the perpendicular distance D2 between the second inner side plate surface and the zero scale line of the vernier.

In the above-mentioned accurate pre-measurement tool for total knee replacement, preferably, the length of the first external measurement jaw is 30mm, the width thereof is 10mm, and the thickness thereof is 1.5mm, and the length of the second external measurement jaw is 10mm, the width thereof is 10mm, and the thickness thereof is 1.5 mm.

In the above-mentioned precise pre-measuring tool for total knee replacement, preferably, the front and back of the main ruler and the front and back of the cursor are provided with corresponding scales.

In the above-mentioned precise pre-measuring tool for total knee replacement, preferably, the first outer measuring jaw and the second outer measuring jaw are made of stainless steel.

In the above-mentioned precise pre-measurement tool for total knee replacement, preferably, the first outer measurement claw is integrally formed with the main scale, and the second outer measurement claw is integrally formed with the vernier.

In the above-mentioned precise pre-measuring tool for total knee replacement, preferably, the vernier is provided with a depth scale extending towards the second end of the main scale.

Advantageous effects

The utility model provides a measuring tool can cut the back at four unification osteotomy module installations completion in the total knee joint replacement art, measures the thickness that thighbone postcondylar osteotomy was cut in advance before really cutting the bone, verifies with plan before the art according to the survey ground result mutually, can in time adjust before the osteotomy is implemented, avoids directly cutting the bone and appears the osteotomy that can't compensate misalignment.

Drawings

Fig. 1 is a schematic front view of an accurate pre-measurement tool in total knee arthroplasty according to an embodiment of the present invention;

FIG. 2 is a left side view of the precise pre-measurement tool for total knee arthroplasty; and

FIG. 3 is a top view of the precise pre-measurement tool for total knee arthroplasty.

Detailed Description

The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention. Unless otherwise specified, the technical means used in the examples are conventional means well known to those skilled in the art.

It should be noted that all expressions using "first", "second", etc. in the embodiments of the present invention are used for distinguishing a plurality of entities with the same name but different names or different parameters, and it can be seen that "first", "second", etc. are only used for convenience of expression and should not be understood as limitations to the embodiments of the present invention, and the following embodiments do not describe this one by one.

Based on the above object, the embodiment of the present invention provides an embodiment of an accurate pre-measurement tool in total knee replacement. Utilize in artifical total knee joint replacement art the utility model provides a measuring tool can cut the bone module installation at four unifications and accomplish the back, carries out accurate pre-measurement to thighbone postcondylar osteotomy thickness before really cutting the bone, verifies with plan before the art according to measuring ground result mutually, can in time adjust before cutting the bone and implementing, avoids directly cutting the bone and appears the osteotomy that can't compensate misalignment. Fig. 1 is a front view of the precise pre-measurement tool in total knee replacement according to the embodiment. Fig. 2 is a left side view of the precise pre-measurement tool in the total knee replacement of the embodiment. Fig. 3 is a schematic top view of the precise pre-measurement tool for total knee arthroplasty according to the embodiment. As shown in fig. 1-3, the precise pre-measuring tool in total knee replacement mainly comprises a main scale 1, a vernier 3, and a pair of

external measuring claws

2 and 4 with different lengths, which are respectively arranged on the same side of the main scale 1 and the vernier 3.

The first end of the main ruler 1 is provided with a plate-shaped first outer measuring claw 2, and the main ruler 1 and the first outer measuring claw 2 form a first L-shaped structure. The vernier 3 is slidably attached to the main scale 1, a plate-shaped second outer measuring claw 4 is arranged at one end of the vernier 3 close to the first end of the main scale 1, and the vernier 3 and the second outer measuring claw 4 form a second L-shaped structure. As shown in fig. 2, the first outer measuring jaw 2 and the second outer measuring jaw 4 are rectangular thin plates or rectangular thin plates. Wherein the length of the first outer measuring jaw 2 is greater than the length of the second outer measuring jaw 4. The first outer measuring jaw 2 includes a first inner plate surface (i.e., a right plate surface of the first outer measuring jaw 2 in fig. 1) that contacts the portion to be measured, and the second outer measuring jaw 4 includes a second inner plate surface (i.e., a left plate surface of the second outer measuring jaw 4 in fig. 1) that contacts the portion to be measured, the first inner plate surface and the second inner plate surface being opposite to each other. The first inner side plate surface and the second inner side plate surface are perpendicular to the ruler surface of the main ruler 1, and therefore the first outer measuring claw 2 and the second outer measuring claw 4 are arranged in parallel. The vertical distance D1 between the first inner board surface and the zero scale line of the main scale 1 is equal to the vertical distance D2 between the second inner board surface and the zero scale line of the cursor 3, so that the zero scale lines of the main scale 1 and the cursor 3 are aligned when the outer measuring jaws are closed. Here, D1 is the shortest horizontal distance in the main scale extending direction between the first inner plate surface of the first outer measuring jaw 2 and the zero scale line of the main scale 1, and D2 is the shortest horizontal distance in the vernier extending direction between the second inner plate surface of the second outer measuring jaw 4 and the zero scale line of the vernier 3.

In a preferred embodiment, the first outer measuring jaw 2 protrudes with a length of 30mm, a width of 10mm and a thickness of 1.5mm, and the second outer measuring jaw 4 protrudes with a length of 10mm, a width of 10mm and a thickness of 1.5 mm.

In a preferred embodiment, in order to facilitate the reading of the left/right knee joint and the medial/lateral condyles, as well as the different positions of the surgeon and the assistant, the front and back of the main ruler 1 and the front and back of the cursor 3 are provided with corresponding scales so that both sides can be read.

In a preferred embodiment, the measuring tools are made of stainless steel, so that the measuring tools are convenient to disinfect and recycle.

In a preferred embodiment, the first outer measuring jaw 2 is formed integrally with the main scale 1, and the second outer measuring jaw 4 is formed integrally with the vernier 3. However, the outer measuring jaw can also be fixed to the main scale 1 and the vernier 3 by means of a detachable (e.g. screw connection) connection. The cursor 3 can be nested on the main scale 1 by the existing assembly method.

In a preferred embodiment, the cursor 3 is provided with a depth scale 5 extending towards the second end of the main scale 1.

The main scale 1 is in millimeter units, the vernier 3 can be provided with 10, 20 or 50 grids, different accuracies can be given to the measuring tool according to the grids, the scale is 9mm long when the vernier 3 is divided by 10, 19mm long when the vernier 3 is divided by 20 and 49mm long when the vernier 3 is divided by 50.

Before use, the outer measuring jaws are first closed to see if the zero scale lines of the cursor 3 and the main scale 1 are aligned. Measurements can be taken if aligned; if there is no alignment, then zero error is recorded: the zero scale line of the vernier 3 is called positive zero error on the right side of the zero scale line of the main scale 1, and is called negative zero error on the left side of the zero scale line of the main scale 1. When the artificial total knee joint replacement is carried out, the second outer measuring claw 4 is inserted into the posterior condylar osteotomy groove of the four-in-one osteotomy module fixed at the distal end of the femur, the first outer measuring claw 2 is tightly attached to the lowest point of the posterior condylar of the femur, and the reading on the main ruler 1 is the thickness of the pre-resected posterior condylar.

The utility model discloses a measuring tool comprises claw, main scale and the vernier is measured outward to the platelike of a pair of length, and wherein the plane at claw place is measured outward mutually perpendicularly with the plane at main scale place. The difference in length between the two outer measuring jaws is between 1-2 posterior condylar radii.

For the person skilled in the art, the above numerical limitations should not limit the scope of the present invention, which is only a preferred embodiment of the present invention. Those skilled in the art can make modifications as needed, as long as they can solve the technical problems described above.

Although the invention has been described in detail with respect to the general description and the specific embodiments, it will be apparent to those skilled in the art that modifications and improvements can be made based on the invention. Therefore, such modifications and improvements are intended to be within the scope of the invention as claimed.

Claims

1. An accurate pre-measurement tool in total knee arthroplasty, comprising:

2. The instrument of claim 1, wherein the first external measurement jaw has a length of 30mm, a width of 10mm, and a thickness of 1.5mm, and the second external measurement jaw has a length of 10mm, a width of 10mm, and a thickness of 1.5 mm.

3. The precise pre-measurement tool for total knee arthroplasty according to claim 1 wherein the front and back sides of the main scale and the front and back sides of the vernier are provided with corresponding graduations.

4. The instrument of claim 1, wherein the first and second external measurement jaws are made of stainless steel.

5. The instrument of claim 1, wherein the first external measurement jaw is integrally formed with the main scale and the second external measurement jaw is integrally formed with the vernier.

6. The instrument of claim 1, wherein the vernier is provided with a depth scale extending toward the second end of the main scale.