A new type of knee joint soft tissue tension gap measuring device

Abstract

The present application discloses a novel knee joint soft tissue tension gap measuring device, which relates to the technical field of total knee replacement instruments. The measuring device comprises a measuring device rod body, a pressure gauge is installed at one end of the measuring device rod body, and the measuring device rod body comprises an air-containing cavity in the middle; a distance measuring component is arranged at one end of the measuring device rod body away from the pressure gauge, and the distance measuring component comprises a fixed plate and a movable plate parallel to the axis of the measuring device rod body, the movable plate is slidably connected to the measuring device rod body and the sliding direction is toward or away from the fixed plate, and the distance measuring component also comprises an air bag arranged between the fixed plate and the movable plate and driving the movable plate to move by filling and deflation; a driving mechanism for exchanging the gas in the air-containing cavity and the air bag is arranged on the measuring device rod body, and the pressure gauge is used to detect the air pressure inside the air bag.

Description

Technical Field

[0001] The present application relates to the technical field of total knee replacement instruments, and in particular to a novel knee joint soft tissue tension gap measuring device. Background Art

[0002] Total knee replacement refers to the use of metal, high-molecular polyethylene, ceramics and other materials to make artificial joint prostheses according to the morphology, structure and function of human joints. It is implanted into the human body through surgical techniques to replace the function of the diseased joint, thereby relieving joint pain and restoring joint function.

[0003] In total knee replacement surgery, restoring and reconstructing the balance between the knee extension gap and the knee flexion gap, the balance between the medial and lateral gaps, and the tension balance of the corresponding soft tissues are key steps that affect the efficacy of the surgery. In the usual knee joint gap measurement, a gap measuring block or a gap measuring tool is used to detect the knee joint gap. However, such measuring tools only measure the gap spacing and cannot measure the tension of the knee joint soft tissues. The obtained rectangular straight and curved gap is not accurate enough, resulting in insufficient soft tissue balance.

[0004] In the related technology, the system 1300 used together with the adjustable spacer and robotic surgical equipment mentioned in the soft tissue balance in robotic knee surgery disclosed in Patent No. CN111615359A can measure the knee joint gap spacing and soft tissue tension, but this kind of equipment includes a robotic surgical system or equipment with a complex structure and high cost, which increases the cost of surgery and the patient's treatment expenses. Summary of the invention

[0005] In order to manufacture a low-cost measuring instrument that can simultaneously measure the distance between the soft tissue gaps and the tension of the soft tissues of the knee joint, so that patients can obtain good surgical results while reducing the treatment burden of the patients, the present application provides a new type of knee joint soft tissue tension gap measuring device.

[0006] The present application provides a novel knee joint soft tissue tension gap measuring device, which adopts the following technical solution:

[0007] A novel knee joint soft tissue tension gap measuring device comprises a measuring device rod body, a pressure gauge is installed at one end of the measuring device rod body, and the measuring device rod body comprises an air-containing cavity in the middle; a distance measuring component is arranged at the end of the measuring device rod body away from the pressure gauge, and the distance measuring component comprises a fixed plate and a movable plate parallel to the axis of the measuring device rod body, the movable plate is slidably connected to the measuring device rod body and the sliding direction is toward or away from the fixed plate, the distance measuring component also comprises an air bag arranged between the fixed plate and the movable plate and driving the movable plate to move by inflation and deflation; a driving mechanism for exchanging the air in the air-containing cavity and the air bag is arranged on the measuring device rod body, and the pressure gauge is used to detect the air pressure inside the air bag.

[0008] By adopting the above technical scheme, an airbag is added to the distance measuring component of the measuring device, and the gas contained in the air chamber in the measuring device rod body provides gas supplement for the airbag. A driving mechanism is provided to exchange the gas between the container cavity and the inside of the airbag to realize the inflation and deflation of the airbag. When the airbag is inflated, it can push the movable plate away from the fixed plate, and the movable plate is pushed to press against the bone in the area to be measured of the knee joint, thereby achieving the purpose of the distance measuring component to measure the distance between the knee joint gap; an air pressure detection gauge is provided at one end of the measuring device rod body to detect the air pressure in the airbag, and quantify the amount of gas filled when the airbag pushes the movable plate to a certain distance, so as to achieve the purpose of simultaneously detecting the tension of the soft tissue of the knee joint; without using a sensor system and a robot system, a pure mechanical structure is realized to simultaneously measure the distance between the knee joint gap and the tension of the soft tissue; a good detection effect is achieved while reducing the production cost, thereby effectively reducing the detection expenditure and alleviating the treatment burden of patients.

[0009] Optionally, the driving mechanism includes a piston sliding in the air-containing chamber, a pull rod fixedly connected to the piston, and a pushing structure for driving the pull rod to move. The air-containing chamber is divided into an upper chamber and a lower chamber by the piston, and the airbag and the lower chamber are connected.

[0010] By adopting the above technical solution, with the cooperation of the pushing mechanism, the movement of the pull rod can move the piston, and the volumes of the upper and lower chambers will change accordingly. When the piston moves in the direction of reducing the volume of the lower chamber, the air in the lower chamber is squeezed into the airbag through the piston. When the piston moves in the direction of increasing the volume of the lower chamber, the gas in the airbag is drawn out, and the gas between the air chamber and the airbag can be exchanged.

[0011] Optionally, a sliding hole for one end of the pull rod to pass through is provided at the end of the air chamber away from the air pressure detection gauge, an extension portion is provided on one side of the measuring rod body, the pushing structure includes a wrench rotatably connected to the extension portion, a long hole is provided at one end of the wrench, a sliding bar sliding in the long hole is fixed at the end of the pull rod away from the piston, and the measuring rod body is provided with a guide structure for limiting the moving direction of the pull rod.

[0012] By adopting the above technical solution, a sliding hole is opened to allow the pull rod to slide in the air chamber to drive the piston to move in the air chamber; a long hole is opened at one end of the wrench and the slide bar slides in the long hole, so that during the process of turning the wrench, the wrench can drive the slide bar to move. Due to the provision of a guide structure, the slide bar and the pull rod are more stable during the movement and are not easy to deviate.

[0013] Optionally, the guide structure includes a sliding groove formed on the side wall of the measuring rod, one end of the wrench with a long hole moves in the sliding groove, the sliding hole is formed on an inner wall of the sliding groove, and a movable hole for the slide bar to slide is formed on the inner wall of the sliding groove.

[0014] By adopting the above technical solution, a sliding groove is provided so that the end of the wrench with a long hole can slide in the measuring rod body and allow the pull rod to move; the slide bar slides in the moving hole, and the movement of the slide bar in a direction perpendicular to the axis of the slide bar is limited by the moving hole, thereby reducing the occurrence of unsmooth movement of the piston caused by the movement of the slide bar deviating from the axial direction of the measuring rod body.

[0015] Optionally, sealing rings are provided on the inner wall of the sliding hole and the outer circumferential side wall of the piston.

[0016] By adopting the above technical solution and setting a sealing ring, when the pull rod drives the piston to move in the air chamber, the circulation of gas in the air chamber and external gas is reduced, thereby improving the accuracy of the data measured by the air pressure detection meter.

[0017] Optionally, the extension portion has a ratchet portion at one end away from the measuring device rod body, the axis of the ratchet portion coincides with the rotation axis of the wrench, and the wrench is rotatably connected with a snap-on strip, the snap-on strip includes a snap-on hook located at one end and used to snap into the ratchet tooth interval of the ratchet portion, and the wrench is provided with a locking member for driving the snap-on hook to rotate and locking the snap-on hook in the position after rotation.

[0018] By adopting the above technical solution, a locking piece is provided to fix the position of the pull rod after it moves, and the sliding locking piece can control the snap hook on the snap strip to press against the ratchet part, thereby limiting the rotation of the wrench, so that after the airbag pushes the movable plate against the measured knee joint gap, the volume of the airbag remains unchanged; on the one hand, the influence of the change in the amount of gas in the lower chamber of the air containing chamber caused by the movement of the wrench under the action of external force on the air pressure measured by the air pressure detection gauge is reduced; on the other hand, the possibility of indirect inaccuracy in the measured knee joint gap caused by the movement of the movable plate due to the change in the volume of the airbag is reduced.

[0019] Optionally, the locking member includes a locking block slidably connected to the wrench, the middle part of the snap-in strip is rotatably connected to the wrench, and one end of the snap-in strip away from the snap-in hook abuts against the locking block and is located on the travel path of the locking block.

[0020] By adopting the above technical solution, the locking block is slidably connected to the wrench, and the movable locking block controls the movement or fixation of the wrench. The end of the clamping strip away from the clamping hook abuts against the locking block, so that the clamping strip rotates when the locking block moves.

[0021] Optionally, a scale block is provided at one end of the measuring rod away from the air pressure detection gauge, the scale block is provided with a slide groove for the movable plate to slide, scales are provided on both sides of the scale block, and the scales on both sides of the scale block are staggered.

[0022] By adopting the above technical solution, a scale block is installed to measure the size of the knee joint gap spacing. Scales are set on both sides of the scale block and the scales are staggered on both sides of the scale. Within the limited length of the scale block, the reading accuracy during measurement can be improved and the measurement error can be reduced.

[0023] Optionally, a detection cavity for plugging a gauge head of an air pressure detection gauge is provided on the measuring device rod, an air guide tube is provided between the detection cavity and the lower cavity, and an air guide channel connecting the lower cavity and the airbag is provided in the measuring device rod.

[0024] By adopting the above technical solution, the air guide channel opened in the measuring rod body allows the air container cavity to communicate with the measuring rod body, so that the air in the container cavity and the air in the airbag can be exchanged. The air guide tube set between the detection cavity and the lower cavity enables the detection cavity to communicate with the lower cavity, so that the air pressure detection meter can detect the air pressure in the airbag.

[0025] Optionally, a limit block is installed at one end of the scale block away from the fixed plate, a reset member is installed in the limit block, and one end of the reset member abuts against the movable plate to apply a reset force to the movable plate.

[0026] By adopting the above technical solution, a limit block is installed at one end of the scale plate away from the positioning block to reduce the possibility of the movable plate falling out of the slide groove during the sliding process. A reset member is installed in the limit block, and the movable plate slides until it contacts the limit block. When the detection is completed, the reset member can cause the movable plate to automatically reset after the airbag is compressed.

[0027] In summary, the present application includes at least one of the following beneficial effects:

[0028] 1. An air pressure detection gauge is set at one end of the measuring rod to detect the air pressure in the airbag, and an airbag is added between the distance measuring components to achieve simultaneous measurement of the knee joint gap spacing and soft tissue tension, which can obtain a more accurate rectangular straight and curved gap, achieve a good balance of the knee joint soft tissue gap, improve the success rate of artificial knee arthroplasty, and extend the service life of the prosthesis;

[0029] 2. The expansion and contraction of the airbag is driven by a piston rod group, and the whole does not use a sensor system or a robot system, realizing a purely mechanical structure to measure the knee joint gap spacing and soft tissue tension; the structure is simple, with few components, which is convenient for maintenance and not easily affected by external factors to cause detection errors or surgical accidents. A new type of knee joint soft tissue tension gap measuring device with a simple purely mechanical drive structure achieves a good detection effect while reducing production costs, thereby effectively reducing detection expenses and alleviating the treatment burden on patients;

[0030] 3. There are scales on both sides of the scale block. The scales on both sides of the scale block are staggered, which can improve the reading accuracy during measurement and reduce measurement errors. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the overall structure of the embodiment of the present application in which the piston moves to the bottom of the air-containing chamber;

[0032] Figure 2 is an overall cross-sectional schematic diagram showing the connection relationship between the piston, the pull rod and the slide bar in an embodiment of the present application;

[0033] Figure 3 yes Figure 2 A local enlarged schematic diagram of point A;

[0034] Figure 4 is an overall cross-sectional schematic diagram showing the internal structure of the housing in an embodiment of the present application;

[0035] Figure 5 yes Figure 4 A local enlarged schematic diagram of point B;

[0036] Figure 6 It is an exploded schematic diagram of the ranging component of an embodiment of the present application.

[0037] Explanation of reference numerals: 1. measuring device rod; 11. air-containing cavity; 111. upper cavity; 112. lower cavity; 12. detection cavity; 13. distance-measuring assembly; 131. fixed plate; 132. movable plate; 1321. clamping block; 133. air bag; 134. limit block; 1341. reset member; 135. liquid-passing hole; 14. sliding hole; 15. sliding groove; 16. moving hole; 161. sinking groove; 17. anti-slip groove; 18. air-guiding channel; 19. abutment sheet; 2. cover shell ; 21. Extension part; 212. Ratchet part; 22. Snap-on strip; 221. Snap-on hook; 23. Locking block; 231. Pushing block; 3. Air guide tube; 4. Air guide block; 5. Driving mechanism; 51. Piston; 511. First extension block; 512. Second extension block; 52. Pull rod; 53. Slide bar; 54. Wrench; 541. Extension rod; 542. Long hole; 6. Sealing ring; 7. Connecting ring; 8. Scale block; 81. Slide groove; 811. Limiting edge; 9. Air pressure detection gauge. DETAILED DESCRIPTION

[0038] The following is combined with Figure 1-6 This application is described in further detail.

[0039] A novel knee joint soft tissue tension gap measuring device disclosed in the embodiment of the present application is referred to Figure 1 and Figure 2 A novel knee joint soft tissue tension gap measuring device comprises a measuring device rod body 1, one end of the measuring device rod body 1 is equipped with an air pressure detection gauge 9, and the other end is provided with a distance measuring component 13, the distance measuring component 13 comprises a fixed plate 131 integrally formed with the measuring device rod body 1, a movable plate 132 sliding on the measuring device rod body in a direction close to or away from the fixed plate 131, and an air bag 133 installed between the fixed plate 131 and the movable plate 132; the end of the measuring device rod body 1 close to the air pressure detection gauge 9 has a container inside The driving mechanism 5 is installed in the middle section of the air cavity 11 and the measuring instrument rod body 1. The driving mechanism 5 can allow the air bag 133 to exchange gas with the air cavity 11, so that the air bag 133 can expand or compress. When the driving mechanism 5 drives the gas in the air cavity 11 to enter the air bag 133, the air bag 133 expands and pushes the movable plate 132 to move to a suitable position, the distance measuring component 13 realizes the measurement of the distance between the knee joint gaps, the air pressure in the air bag 133 changes, the indication of the air pressure detection gauge 9 changes, and the soft tissue tension of the knee joint is measured.

[0040] Reference Figure 1 A plurality of anti-slip grooves 17 are provided at equal intervals along the length direction of the measuring rod 1 at one end of the measuring rod 1 close to the air pressure detection gauge 9. During the detection process, the friction between the user's palm and the outer surface of the measuring rod 1 prevents the measuring rod 1 from slipping out of the hand.

[0041] Reference Figure 2 and Figure 3The driving mechanism 5 includes a piston 51 sliding in the air chamber 11, a pull rod 52 fixedly connected to one end face of the piston 51, and a pushing structure for pushing the pull rod 52 to move; the piston 51 divides the air chamber 11 into an upper chamber 111 and a lower chamber 112, the air bag 133 is connected to the lower chamber 112, and a sliding hole 14 for the pull rod 52 to pass through is opened at one end of the air chamber 11 away from the air pressure detection gauge 9, so that the pull rod 52 can also slide in the air chamber 11.

[0042] Reference Figure 4 The pushing structure includes an extension part 21 fixed to one side of the measuring device rod body 1 and a wrench 54 rotatably connected to the extension part 21. The structure of the wrench 54 includes a housing 2 and two extension rods 541. The two extension rods 541 are located at one end of the housing 2 away from the air pressure detection gauge 9 and are integrally formed with the housing 2. A slide bar 53 is vertically inserted into the end of the pull rod 52 away from the piston 51. The slide bar 53 also includes edges at both ends. The pull rod 52 is located between the two extension rods 541. The two extension rods 541 are provided with long holes 542 for the slide bar 53 to slide. The slide bar 53 rotates the wrench 54 to drive the slide bar 53 to move in the long hole 542. The movement of the slide bar 53 drives the pull rod 52 to drive the piston 51 to move axially along the air chamber 11, so that the airbag 133 and the gas in the air chamber 11 are exchanged with each other.

[0043] Reference Figure 1 and Figure 2 In order to prevent the slide bar 53 and the pull rod 52 from deviating from the axis of the measuring device rod body 1 in the moving direction and to make the movement more stable, a sliding groove 15 is provided on the side wall of the measuring device rod body 1, and two extension rods 541 with long holes 542 are provided on the wrench 54, which can slide in the sliding groove 15; a moving hole 16 is also provided on one side wall of the sliding groove 15, and there is a sinking groove 161 in the moving hole 16, and the edge piece at one end of the slide bar 53 presses against the sinking groove 161 and slides in the moving hole 16, and the edge piece at the other end of the slide bar 53 presses against one side wall of the moving hole 16 and can slide in the moving hole 16. The moving hole 16 guides the movement of the slide bar 53, so that the slide bar 53 can only move along the axis direction of the measuring device rod body 1, so as to ensure the smoothness of the movement of the piston 51.

[0044] Reference Figure 2 and Figure 3A connecting ring 7 is embedded in one end of the airbag 133 near the air chamber 11, and the connecting ring 7 is connected to the air guide block 4. A gas guide channel 18 connected to the air guide block 4 is provided in the side wall of the moving hole 16 of the measuring device rod body 1 where the long hole 542 is not provided, so as to realize the gas flow between the airbag 133 and the lower chamber 112 of the air chamber 11. The measuring device rod body 1 is provided with a detection chamber 12 for plugging the gauge head of the air pressure detection meter 9, and an air guide tube 3 connecting the detection chamber 12 and the lower chamber 112 is installed on the outer surface of the measuring device rod body 1. The air guide tube 3 includes two openings, one opening connected to the lower end of the detection chamber 12, and the other opening connected to the end of the lower chamber 112 near the moving hole 16, so that the air pressure detection meter 9 can detect the air pressure in the airbag 133 through the detection chamber 12. There are a first expansion block 511 and a second expansion block 512 on one end surface of the piston 51 close to the moving hole 16. The first expansion block 511 is located on the side of the piston 51 close to the air duct 3, and when the piston 51 is located at the bottom of the lower chamber 112, it can block the communication between the lower chamber 112 and the air duct 3; the second expansion block 512 is located on the side of the piston 51 away from the air duct 3, and when the piston 51 is located at the bottom of the lower chamber 112, it can block the flow between the lower chamber 112 and the air duct 18.

[0045] Reference Figure 3 The inner wall of the sliding hole 14 and the outer circumferential side wall of the piston 51 are both installed with a sealing ring 6. When the piston 51 moves in the air chamber 11, the sealing ring 6 can reduce the flow of gas in the air chamber 11 and the external gas, and the data measured by the air pressure detection meter 9 can be more accurate.

[0046] Reference Figure 5 The end of the extension part 21 away from the connection has a ratchet part 212, and the ratchet part 212 is located in the housing 2 and is rotatably connected to the wrench 54. The housing 2 is also rotatably connected to a clamping strip 22, and one end of the clamping strip 22 has a clamping hook 221 integrally formed with the clamping strip 22, and the clamping hook 221 is inclined along the clamping strip 22 in a direction away from the ratchet part 212. A locking block 23 is slidably connected to the cover shell 2, and a pushing block 231 is integrally formed at one end of the locking block 23 close to the ratchet part 212. When the locking block 23 slides on the wrench 54, the pushing block 231 can push the clamping strip 22 to rotate, and as the clamping strip 22 rotates, the clamping hook 221 can be inserted into the interval of the ratchet part 212, thereby locking the position of the wrench 54; when the locking piece slides away from the clamping strip 22, the clamping strip 22 will rotate under the action of its own gravity, and the clamping hook 221 will also move away from the ratchet part 212, and the wrench 54 resumes free rotation.

[0047] Reference Figure 1The measuring device rod 1 is provided with an abutting piece 19 on one side facing the wrench 54. The abutting piece 19 is arranged in a direction in which the distance from the measuring device rod 1 gradually increases, and can abut against the wrench 54 to assist the wrench 54 in resetting. During the test, the wrench 54 moves to abut against the abutting piece 19. After the test is completed, the locking block 23 is moved to release the wrench 54. The abutting piece 19 will bounce the wrench 54 away for a certain distance, so that the airbag 133 partially contracts, and the movable plate 132 moves and no longer abuts against the gap to be measured, so that the distance measuring component 13 is convenient to move out of the soft tissue gap of the knee joint to be measured.

[0048] Reference Figure 4 and Figure 6 The distance measuring assembly 13 also includes a scale block 8 installed on the end of the measuring device rod body 1 away from the air pressure detection meter 9, and a slide groove 81 is provided on the scale block 8 for the movable plate 132 to slide. A limit edge 81 is provided at the opening of the slide groove 81, and the movable plate 132 includes a clamping block 1321 at one end close to the slide groove 81, and clamping grooves are provided on both sides of the clamping block 1321 to clamp with the limit edge 811. Scales are engraved on both sides of the scale block 8 to measure the knee joint gap spacing, and the scales are staggered on both sides of the scale block 8, so that the scale block 8 can improve the reading accuracy during measurement within a limited length. In this embodiment, the measurement range of the scale block 8 is set to 5-18mm, and the measurement range can be set according to actual needs.

[0049] Reference Figure 6 A limit block 134 is installed at one end of the scale block 8 away from the fixed plate 131 to prevent the movable plate 132 from falling out of the slide groove 81. A reset member 1341 is installed in the limit block 134. In this embodiment, the reset member 1341 is specifically two diamond-shaped spring pieces. In other embodiments, the reset member 1341 can also be a spring. The end of the reset member 1341 close to the movable plate 132 can be abutted against the clamping block 1321 on the movable plate 132, so that the movable plate 132 is automatically reset. Both the clamping block 1321 and the limit block 134 are provided with a liquid hole 135 to facilitate the flow of detergent during cleaning and disinfection, which is convenient for cleaning.

[0050] The implementation principle of a new type of knee joint soft tissue tension gap measuring device in the embodiment of the present application is as follows: push the locking block 23 to make the snap hook 221 away from the ratchet part 212, and pull the wrench 54 to minimize the distance between the movable plate 132 and the fixed plate 131; place the distance measuring component 13 in the soft tissue gap of the knee joint to be measured so that the fixed plate 131 is against one side of the gap to be measured, pull the wrench 54 in the direction where the wrench 54 is close to the air pressure detection gauge 9, and when the air bag 133 expands and pushes the movable plate 132 against the other side of the gap to be measured, slide the locking block 23 to make the snap hook 221 clamp the ratchet part 212 to lock the position of the wrench 54; observe and record the distance between the fixed plate 131 and the movable plate 132 displayed on the scale block 8 and the reading on the air pressure detection gauge 9; after the detection is completed, slide the locking block 23 to make the locking block 23 away from the ratchet part 212 to release the locking state of the wrench 54. Pull the wrench 54 away from the air pressure detection gauge 9, the airbag 133 contracts, and the movable plate 132 slides toward the fixed plate 131, so that the distance measuring component 13 is moved out of the soft tissue gap of the knee joint to be measured.

[0051] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A novel knee joint soft tissue tension gap measuring device, comprising a measuring device rod body (1), an air pressure detection gauge (9) being installed at one end of the measuring device rod body (1), and the measuring device rod body (1) comprising an air containing cavity (11) in the middle; A distance measuring assembly (13) is provided at one end of the measuring device rod body (1) away from the air pressure detection gauge (9), the distance measuring assembly (13) comprising a fixed plate (131) and a movable plate (132) parallel to the axis of the measuring device rod body (1), the movable plate (132) being slidably connected to the measuring device rod body (1) and sliding in a direction towards or away from the fixed plate (131), the distance measuring assembly (13) further comprising an air bag (133) arranged between the fixed plate (131) and the movable plate (132) and driving the movable plate (132) to move by means of inflation or deflation; a driving mechanism (5) for exchanging gas inside the air containing cavity (11) and the air bag (133) is provided on the measuring device rod body (1), and the air pressure detection gauge (9) is used to detect the air pressure inside the air bag (133); The driving mechanism (5) comprises a piston (51) sliding in the air-containing chamber (11), a pull rod (52) fixedly connected to the piston (51), and a pushing structure for driving the pull rod (52) to move; the air-containing chamber (11) is divided into an upper chamber (111) and a lower chamber (112) by the piston (51); the air bag (133) is connected to the lower chamber (112); The end of the air-containing cavity (11) away from the air pressure detection gauge (9) is provided with a sliding hole (14) for one end of the pull rod (52) to pass through, and an extension portion (21) is provided on one side of the measuring device rod body (1). The pushing structure includes a wrench (54) rotatably connected to the extension portion (21); a long hole (542) is provided on one end of the wrench (54), and a sliding bar (53) sliding in the long hole (542) is fixed to the end of the pull rod (52) away from the piston (51), and the measuring device rod body (1) is provided with a guide structure for limiting the moving direction of the pull rod (52); The guide structure comprises a sliding groove (15) formed on the side wall of the measuring device rod body (1); one end of the wrench (54) having the long hole (542) is movable in the sliding groove (15); the sliding hole (14) is formed on an inner wall of the sliding groove (15); and a movable hole (16) for the sliding bar (53) to slide is formed on an inner wall of the sliding groove (15).

2. A novel knee joint soft tissue tension gap measuring device according to claim 1, characterized in that: Sealing rings (6) are provided on the inner wall of the sliding hole (14) and the outer circumferential side wall of the piston (51).

3. A new type of knee joint soft tissue tension gap measuring device according to claim 1, characterized in that: The end of the extension portion (21) away from the measuring device rod body (1) has a ratchet portion (212), the axis of the ratchet portion (212) coincides with the rotation axis of the spanner (54), the spanner (54) is rotatably connected to a clamping strip (22), the clamping strip (22) comprising a clamping hook (221) located at one end and used to clamp to the ratchet teeth of the ratchet portion (212), and the spanner (54) is provided with a locking member for driving the clamping hook (221) to rotate and locking the clamping hook (221) in a rotated position.

4. A new type of knee joint soft tissue tension gap measuring device according to claim 3, characterized in that: The locking member comprises a locking block (23) slidably connected to the wrench (54); the middle portion of the clamping strip (22) is rotatably connected to the wrench (54); an end of the clamping strip (22) away from the clamping hook (221) abuts against the locking block (23) and is located on a travel path of the locking block (23).

5. A new type of knee joint soft tissue tension gap measuring device according to claim 1, characterized in that: A scale block (8) is provided at one end of the measuring device rod body (1) away from the air pressure detection gauge (9), and a slide groove (81) is provided on the scale block (8) for the movable plate (132) to slide. Both sides of the scale block (8) are provided with scales, and the scales on both sides of the scale block (8) are staggered.

6. A new type of knee joint soft tissue tension gap measuring device according to claim 1, characterized in that: The measuring device rod body (1) is provided with a detection cavity (12) for plugging the gauge head of the air pressure detection gauge (9), an air guide tube (3) is provided between the detection cavity (12) and the lower cavity (112), and an air guide channel (18) communicating with the lower cavity (112) and the air bag (133) is provided in the measuring device rod body (1).

7. A new type of knee joint soft tissue tension gap measuring device according to claim 5, characterized in that: A limit block (134) is installed at one end of the scale block (8) away from the fixed plate (131), a reset member (1341) is installed in the limit block (134), and one end of the reset member (1341) abuts against the movable plate (132) for applying a reset force to the movable plate (132).

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