Knee joint soft tissue balance measuring instrument
By designing a knee joint soft tissue balance measuring instrument with adjustable width and height, the problem that existing instruments cannot adapt to the distance between different patients is solved, the versatility of the instrument is improved and the cost is reduced.
Patent Information
- Application Number
- CN202420625164.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-28
- Publication Date
- 2025-01-24
- Estimated Expiration
- 2034-03-28
AI Technical Summary
The existing knee soft tissue balance measuring instrument cannot adjust the spacing between the measuring heads, cannot adapt to the spacing between the internal and external ankle osteotomy surfaces of different patients, and is poor in versatility.
Design a measuring frame, width adjustment screw, width adjustment slider and the knee soft tissue balance measuring meter with the measured head, the width adjustment between the measurement head through the first filament mechanism, and realize it through the second silk bar mechanism. The height adjustment of the measurement head.
This instrument can adapt to different width and height femoral bones, improve the generality of measuring instruments, reduce production costs, and does not need to design different specifications of measuring instruments for different patients.
Smart Images
Figure CN222383193U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of medical instruments, in particular to a knee joint soft tissue balance measuring instrument. Background Art
[0002] The knee joint is one of the largest and most important joints in the human body. Knee joint lesions will seriously affect the patient's mobility and reduce their quality of life. For some seriously diseased knee joints, total knee arthroplasty (TKA) technology can be used. Total knee arthroplasty can maximize the reconstruction of knee joint function and improve the patient's quality of life. It is an important surgical solution for treating severe knee joint lesions.
[0003] The soft tissue balance technology around the knee in total knee replacement requires the use of a soft tissue balance measuring instrument. When the soft tissue measuring instrument performs pressure measurement, the two measuring heads of the measuring instrument need to be placed between the two osteotomy surfaces of the medial and lateral malleolus of the femur and the osteotomy surface of the tibia. Therefore, the distance between the two measuring heads needs to match the distance between the osteotomy surface of the medial and lateral malleolus of the femur and the osteotomy surface of the lateral malleolus of the femur. The distance between the osteotomy surfaces of the medial and lateral malleolus of different patients is different. The soft tissue balance measuring instrument in the prior art cannot adjust the distance between the two measuring heads, and cannot achieve universality for the distance between the osteotomy surfaces of the medial and lateral malleolus of different patients, and has poor universality. Utility Model Content
[0004] In order to solve the above technical problems, the utility model provides a knee joint soft tissue balance measuring instrument, which can adapt to femurs of different widths and improves versatility.
[0005] To achieve the above-mentioned purpose, the utility model provides a knee joint soft tissue balance measuring instrument, including a measuring frame, a width adjustment screw is rotatably provided on the measuring frame, a width adjustment slider and two measuring heads are slidably provided on the measuring frame, the width adjustment screw and the width adjustment slider form a first screw mechanism, sliding parts are provided on both sides of the width adjustment slider, a sliding groove is provided on the measuring head, the sliding part is slidably provided in the corresponding sliding groove, and the sliding part drives the two measuring heads to be relatively close to or away from each other through the sliding groove.
[0006] In one embodiment of the utility model, the sliding groove is an inclined groove, the inclination direction of the sliding groove is along the direction in which the measuring heads are relatively close to or away from each other, the symmetry plane between the two measuring heads is the first plane, and the sliding grooves on the two measuring heads are symmetrically arranged about the first plane.
[0007] In an embodiment of the present invention, the direction in which the measuring head approaches or moves away from each other is a width adjustment direction, and the sliding direction of the width adjustment slider is arranged perpendicular to the width adjustment direction.
[0008] In one embodiment of the utility model, a transmission block is provided on the measuring frame, transmission pins are provided on both sides of the transmission block, a transmission groove is provided on the measuring head, the transmission pin is inserted into the corresponding transmission groove, and the axis of the transmission groove is along the width adjustment direction.
[0009] In one embodiment of the utility model, a height adjustment screw is rotatably provided on the measuring frame, a height adjustment slider is slidably provided on the measuring frame, the height adjustment screw and the height adjustment slider form a second screw mechanism, a main sliding wedge surface is provided on the height adjustment slider, a slave sliding wedge surface is provided on the measuring head, the main sliding wedge surface and the slave sliding wedge surface are slidably matched, and the height adjustment sliding block drives the measuring head to slide along the height direction through the cooperation between the main sliding wedge surface and the slave sliding wedge surface.
[0010] In one embodiment of the utility model, at least three main sliding wedge surfaces are provided, the number of the slave sliding wedge surfaces is the same as that of the main sliding wedge surfaces, the slope and height of each main sliding wedge surface are the same, the slope and height of each slave sliding wedge surface are the same, and the main sliding wedge surface and the slave sliding wedge surface have the same slope.
[0011] In one embodiment of the utility model, the direction in which the measuring head slides along the height direction is the height adjustment direction, the sliding direction of the width adjustment slider is the same as the height adjustment direction, and the width adjustment direction, the height adjustment direction, and the sliding direction of the height adjustment slider are perpendicular to each other.
[0012] In one embodiment of the utility model, the height adjustment slider includes a first sliding seat, a second sliding seat and a third sliding seat, the main sliding wedge surface includes a first main sliding wedge surface, a second main sliding wedge surface and a third main sliding wedge surface, the first main sliding wedge surface is arranged on the first sliding seat, the second main sliding wedge surface is arranged on the second sliding seat, and the third main sliding wedge surface is arranged on the third sliding seat; the slave sliding wedge surface includes a first slave sliding wedge surface, a second slave sliding wedge surface and a third slave sliding wedge surface, the first slave sliding wedge surface is arranged at the bottom of one of the measuring heads, the second slave sliding wedge surface is arranged at the bottom of the other measuring head, and the third slave sliding wedge surface is arranged at the bottom of the transmission block; the first main sliding wedge surface cooperates with the first slave sliding wedge surface, the second main sliding wedge surface cooperates with the second slave sliding wedge surface, and the third main sliding wedge surface cooperates with the third slave sliding wedge surface.
[0013] In one embodiment of the utility model, a sliding groove is provided on the measuring frame, a connecting rod is connected to the height adjustment slider, a height indicating needle is provided at one end of the connecting rod passing through the sliding groove, a height scale value is provided on the measuring frame, and the height indicating needle is provided corresponding to the height scale value; a width scale value is provided on the measuring frame, a width indicating needle is provided on the measuring head, and the width indicating needle is provided corresponding to the width scale value.
[0014] In one embodiment of the present invention, the measuring head is provided with a mounting groove and a contact piece, and a pressure sensor is detachably provided between the mounting groove and the contact piece.
[0015] The above technical solution of the utility model has the following advantages compared with the prior art:
[0016] (1) The knee joint soft tissue balance measuring instrument described in the utility model forms a first screw mechanism through a width adjustment screw and a width adjustment slider, which converts the rotational motion of the width adjustment screw into the sliding motion of the width adjustment slider, and under the cooperation of the sliding part on the width adjustment slider and the sliding groove on the measuring head, the width adjustment between the two measuring heads is realized through the sliding motion of the width adjustment slider to adapt to femurs of different specifications, that is, to adapt to the distance between the two osteotomy surfaces on different femurs. One measuring instrument can adapt to femurs of various specifications, thereby improving the versatility of the measuring instrument, and there is no need to design measuring instruments of different width specifications for the patient's femur, thereby reducing the cost of the measuring instrument.
[0017] (2) The knee joint soft tissue balance measuring instrument described in the utility model forms a second screw mechanism through a height adjustment screw and a height adjustment slider, which converts the rotational motion of the height adjustment screw into the sliding motion of the height adjustment slider, and with the cooperation of the main sliding wedge surface on the height adjustment slider and the slave sliding wedge surface on the measuring head, the height adjustment of the two measuring heads is realized through the sliding motion of the height adjustment slider. One measuring instrument can adapt to prostheses of various heights, thereby improving the versatility of the measuring instrument. There is no need to design measuring instruments of different height specifications according to the patient's femur, thereby reducing the cost of the measuring instrument. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.
[0019] Figure 1 It is an exploded view of the knee joint soft tissue balance measuring instrument of the utility model;
[0020] Figure 2 It is a structural schematic diagram of the width adjustment between the measuring heads of the knee joint soft tissue balance measuring instrument of the utility model;
[0021] Figure 3 It is a structural schematic diagram of the height adjustment of the measuring head of the knee joint soft tissue balance measuring instrument of the utility model;
[0022] Figure 4 It is an exploded view of the height adjustment of the measuring head of the knee joint soft tissue balance measuring instrument of the utility model;
[0023] Figure 5 It is a top view of the knee joint soft tissue balance measuring instrument of the utility model;
[0024] Figure 6 It is an exploded view of the measuring head of the knee joint soft tissue balance measuring instrument of the utility model;
[0025] Figure 7 It is a stereoscopic diagram of the knee joint soft tissue balance measuring instrument of the utility model;
[0026] Figure 8 It is a stereoscopic diagram of the knee joint soft tissue balance measuring instrument (with the measuring upper cover hidden) of the utility model.
[0027] Description of the Figures in the Specification:
[0028] 1. Measuring frame; 2. Width adjustment screw; 3. Width adjustment slider; 4. Measuring head; 5. Sliding part; 6. Sliding groove; 7. Transmission block; 8. Transmission pin; 9. Transmission groove; 10. Height adjustment screw; 11. Height adjustment slider; 12. Main sliding wedge surface; 13. Slave sliding wedge surface; 14. First sliding seat; 15. Second sliding seat; 16. Third sliding seat; 17. First main sliding wedge surface; 18. Second main sliding wedge surface; 19. Third main sliding wedge surface; 2 0. First slave sliding wedge surface; 21. Second slave sliding wedge surface; 22. Third slave sliding wedge surface; 23. Sliding groove; 24. Connecting rod; 25. Height indicator needle; 26. Height scale value; 27. Width scale value; 28. Width indicator needle; 29. Mounting groove; 30. Contact piece; 31. Measuring cover; 32. Measuring base; 33. Limiting sliding groove; 34. Sliding connecting rod; 35. Sliding card slot; 36. Limiting buckle; 37. Pressure sensor; 38. Measuring handle. DETAILED DESCRIPTION
[0029] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0030] Reference Figures 1 to 8 As shown, the knee joint soft tissue balance measuring instrument of the utility model comprises a measuring frame 1, on which a width adjustment screw 2 is rotatably provided, on which a width adjustment slider 3 and two measuring heads 4 are slidably provided, the width adjustment screw 2 and the width adjustment slider 3 form a first screw mechanism, both sides of the width adjustment slider 3 are provided with sliding parts 5, on which a sliding groove 6 is provided, the sliding part 5 is slidably provided in the corresponding sliding groove 6, and the sliding part 5 drives the two measuring heads 4 to be relatively close to or away from each other through the sliding groove 6.
[0031] The knee joint soft tissue balance measuring instrument (hereinafter referred to as the measuring instrument) of the present application includes a measuring frame 1, and a first screw mechanism is arranged on the measuring frame 1. The first screw mechanism is used to adjust the width between two measuring heads 4 on the measuring instrument to adapt to femurs of different width specifications, that is, to adapt to different distances between two osteotomy surfaces on different femurs. Specifically, the first screw mechanism includes a width adjustment screw 2 and a width adjustment slider 3. The width adjustment screw 2 is rotatably connected to the measuring frame 1. The width adjustment screw 2 only has a rotational degree of freedom along its axis, and the width adjustment slider 3 is slidably connected to the measuring frame 1. The width adjustment slider 3 is provided with an internal thread, and the width adjustment screw 2 is provided with an external thread. The internal thread and the external thread cooperate to form a first screw mechanism, which converts the rotational motion of the width adjustment screw 2 into the sliding motion of the width adjustment slider 3. Therefore, the width adjustment slider 3 can slide under the drive of the width adjustment screw 2. Sliding parts 5 are provided on both sides of the width adjustment slider 3, and sliding grooves 6 are provided on the measuring heads 4. The sliding parts 5 on the width adjustment slider 3 can be slidably arranged in the sliding grooves 6 on the corresponding measuring heads 4. Due to the cooperation between the sliding parts 5 and the sliding grooves 6, under the sliding of the width adjustment slider 3, the sliding parts 5 on the width adjustment slider 3 can drive the two measuring heads 4 to slide relative to each other through the sliding grooves 6, so as to achieve the relative approach or distance between the two measuring heads 4. Therefore, the width adjustment between the two measuring heads 4 can be achieved through the first screw mechanism and the cooperation between the sliding parts 5 and the sliding grooves 6. Among them, a width adjustment knob can be provided on the width adjustment screw 2, and the user can directly turn the width adjustment knob by hand to drive the width adjustment screw 2 to rotate, or the user can rotate the width adjustment knob with a screwdriver. In addition, the sliding part 5 can be in the form of a sliding ball head to improve the transmission stability.
[0032] The knee joint soft tissue balance measuring instrument of the present application forms a first screw mechanism through a width adjustment screw 2 and a width adjustment slider 3, which converts the rotational motion of the width adjustment screw 2 into the sliding motion of the width adjustment slider 3, and with the cooperation of the sliding portion 5 on the width adjustment slider 3 and the sliding groove 6 on the measuring head 4, the width adjustment between the two measuring heads 4 is realized through the sliding motion of the width adjustment slider 3 to adapt to femurs of different specifications, that is, to adapt to the distance between the two osteotomy surfaces on different femurs. One measuring instrument can adapt to femurs of various specifications, thereby improving the versatility of the measuring instrument, and there is no need to design measuring instruments of different width specifications for the patient's femur, thereby reducing the cost of the measuring instrument.
[0033] In one embodiment, the sliding groove 6 is an inclined groove, the inclination direction of the sliding groove 6 is along the direction in which the measuring heads 4 are relatively approaching or moving away, the symmetry plane between the two measuring heads 4 is the first plane, and the sliding grooves 6 on the two measuring heads 4 are symmetrically arranged about the first plane.
[0034] The sliding part 5 on the width adjustment slider 3 drives the two measuring heads 4 to move relatively closer or farther away through the sliding groove 6 on the measuring head 4. Specifically, the sliding groove 6 is an inclined groove, the groove wall of the sliding groove 6 forms a wedge surface, and the inclined direction of the sliding groove 6 is along the direction in which the measuring heads 4 move relatively closer or farther away. Figure 1 and Figure 2 As shown, the top of the inclined slot is inclined toward the width adjustment screw 2, that is, the top of the sliding slot 6 is closer to the width adjustment screw 2, and the bottom of the sliding slot 6 is farther from the width adjustment screw 2. Further, the symmetry plane between the two measuring heads 4 is a first plane (not shown in the figure), and the sliding slots 6 on the two measuring heads 4 are arranged symmetrically about the first plane, so that the two measuring heads 4 can be driven by the width adjustment screw 2 to move relatively close to or away from each other at the same time to achieve synchronous adjustment.
[0035] In one embodiment, the direction in which the measuring head 4 approaches or moves away from each other is the width adjustment direction, and the sliding direction of the width adjustment slider 3 is perpendicular to the width adjustment direction.
[0036] The direction in which the measuring heads 4 are relatively approached or moved away is the width adjustment direction, and the sliding direction of the width adjustment slider 3 is arranged perpendicular to the width adjustment direction, which can improve the stability of the width adjustment between the two measuring heads 4 .
[0037] In one embodiment, a transmission block 7 is provided on the measuring frame 1, and transmission pins 8 are provided on both sides of the transmission block 7. A transmission groove 9 is provided on the measuring head 4, and the transmission pin 8 is inserted into the corresponding transmission groove 9. The axis of the transmission groove 9 is along the width adjustment direction.
[0038] The sliding portion 5 on the width adjustment slide block 3 drives the two measuring heads 4 to move closer or farther away from each other through the sliding groove 6 on the measuring heads 4. Figure 1 and Figure 2 As shown in the figure, when the width adjustment screw 2 is rotated and the width adjustment screw 2 drives the width adjustment slider 3 to move in the vertical direction, due to the friction between the sliding portion 5 and the sliding groove 6, it is possible that the sliding portion 5 drives the sliding groove 6 to move upward or downward. In order to ensure that when the width adjustment screw 2 drives the width adjustment slider 3 to move in the vertical direction, the two measuring heads 4 only move relatively close to or away from each other, a transmission block 7 is provided on the measuring frame 1, as shown in FIG. Figure 1 and Figure 2As shown, both sides of the transmission block 7 are provided with transmission pins 8, and the measuring head 4 is provided with a transmission groove 9 matching the transmission pin 8. The transmission pin 8 is inserted into the corresponding transmission groove 9, and the axis of the transmission groove 9 is along the width adjustment direction, that is, the axis of the transmission groove 9 is along the direction of the measuring head 4 being relatively close to or away from. Due to the existence of the transmission block 7, the transmission pin 8 on the transmission block 7 will limit the transmission groove 9 on the measuring head 4, and the transmission pin 8 on the transmission block 7 will limit the movement of the measuring head 4 in the vertical direction, allowing the transmission groove 9 to slide along the axial direction of the transmission pin 8, that is, allowing the measuring head 4 to move in the direction of relatively close to or away from. Therefore, under the cooperation of the sliding part 5 and the inclined sliding groove 6, and under the constraint of the transmission groove 9 on the transmission pin 8, when the width adjustment slider 3 moves in the vertical direction, the two measuring heads 4 only move relatively close to or away from each other. Further, when the width adjustment slider 3 moves upward in the vertical direction, the two measuring heads 4 are relatively far away; when the width adjustment slider 3 moves downward in the vertical direction, the two measuring heads 4 are relatively close.
[0039] In one embodiment, a height adjustment screw 10 is rotatably provided on the measuring frame 1, and a height adjustment slider 11 is slidably provided on the measuring frame 1. The height adjustment screw 10 and the height adjustment slider 11 form a second screw mechanism. A main sliding wedge surface 12 is provided on the height adjustment slider 11, and a slave sliding wedge surface 13 is provided on the measuring head 4. The main sliding wedge surface 12 and the slave sliding wedge surface 13 are slidably matched with each other. The height adjustment sliding block drives the measuring head 4 to slide along the height direction through the cooperation between the main sliding wedge surface 12 and the slave sliding wedge surface 13.
[0040] The knee joint soft tissue balance measuring instrument of the present application can not only realize width adjustment, but also realize height adjustment of the measuring head 4 to simulate the thickness of different prostheses, further improving the versatility of the measuring instrument. Specifically, the height adjustment of the measuring head 4 is realized by a second screw mechanism, and the second screw mechanism includes a height adjustment screw 10 and a height adjustment slider 11. The height adjustment screw 10 is rotatably connected to the measuring frame 1. The height adjustment screw 10 only has a rotational degree of freedom along its axis, and the height adjustment slider 11 is slidably connected to the measuring frame 1. The height adjustment slider 11 is provided with an internal thread, and the height adjustment screw 10 is provided with an external thread. The internal thread and the external thread cooperate to form a second screw mechanism, which converts the rotational motion of the height adjustment screw 10 into the sliding motion of the height adjustment slider 11. Therefore, the height adjustment slider 11 can slide under the drive of the height adjustment screw 10. Furthermore, the height adjustment slider 11 is provided with a main sliding wedge surface 12, and the measuring head 4 is provided with a secondary sliding wedge surface 13, and the main sliding wedge surface 12 and the secondary sliding wedge surface 13 are slidably matched, and through the cooperation between the main sliding wedge surface 12 and the secondary sliding wedge surface 13, the sliding motion of the height adjustment slider 11 in the front-to-back direction can be converted into the sliding motion of the measuring head 4 in the height adjustment direction, so as to realize the sliding of the measuring head 4 in the height adjustment direction. Figure 1 , Figure 3 and Figure 4 As shown, when the height adjustment screw 10 is rotated, the rotational movement of the height adjustment screw 10 is converted into the forward and backward sliding movement of the height adjustment slider 11. When the height adjustment slider 11 moves forward and backward, there is a possibility that the transmission block 7 moves forward and backward, but the measuring frame 1 constrains the movement of the measuring head 4 in the forward and backward direction, and the transmission groove 9 on the measuring head 4 constrains the forward and backward movement of the transmission pin 8. Therefore, under the constraint of the transmission groove 9 on the transmission pin 8, and the cooperation of the main sliding wedge surface 12 and the slave sliding wedge surface 13, when the height adjustment slider 11 moves forward and backward, the measuring head 4 only moves in the height direction. Further, as Figure 1 , Figure 3 and Figure 4As shown, when the height adjustment slider 11 moves forward, the measuring head 4 moves downward; when the height adjustment slider 11 moves backward, the measuring head 4 moves upward. Therefore, the measuring instrument of the present application can be adjusted in both width and height directions, and can adapt to femurs of different widths and prostheses of different thicknesses at the same time. Therefore, one measuring instrument can adapt to the soft tissue balance measurement of all patients, greatly improving the versatility of the measuring instrument. In addition, during intraoperative measurement, the measuring instrument can be inserted between the femur and the tibia in normal dislocation, without manually stretching the femur and the tibia to increase the dislocation distance; and, in terms of the width of the inner and outer condyles, it can be directly adjusted to a suitable position during the operation, that is, the width between the two measuring heads 4 can be directly adjusted during the operation. Among them, a height adjustment knob can be set on the height adjustment screw 10, and the user can directly turn the height adjustment knob by hand to drive the height adjustment screw 10 to rotate, or the user can rotate the height adjustment knob with a screwdriver. In addition, the measuring frame 1 includes a measuring cover 31 and a measuring base 32 . The measuring cover 31 and the measuring base 32 are connected to each other. Related transmission mechanisms such as a first screw mechanism and a second screw mechanism are all arranged on the measuring frame 1 .
[0041] In one embodiment, at least three main sliding wedge surfaces 12 are provided, the number of the slave sliding wedge surfaces 13 is the same as the main sliding wedge surfaces 12, the slope and height of each main sliding wedge surface 12 are the same, the slope and height of each slave sliding wedge surface 13 are the same, and the main sliding wedge surface 12 and the slave sliding wedge surface 13 have the same slope.
[0042] In order to improve the height adjustment efficiency of the two measuring heads 4, the number of the main sliding wedge surfaces 12 and the number of the secondary sliding wedge surfaces 13 are the same, and at least three are provided. Preferably, three main sliding wedge surfaces 12 and three secondary sliding wedge surfaces 13 are provided. Furthermore, the slope and height of the three main sliding wedge surfaces 12 are the same, the slope and height of the three secondary sliding wedge surfaces 13 are the same, and the slope of the main sliding wedge surface 12 and the secondary sliding wedge surface 13 are the same, so that the two measuring heads 4 can be ensured to rise and fall synchronously. The height of each of the main sliding wedge surface 12 and the secondary sliding wedge surface 13 is designed according to actual needs, such as Figure 3 As shown, the height of the secondary sliding wedge surface 13 can be set to be greater than the height of the main sliding wedge surface 12 .
[0043] In one embodiment, the direction in which the measuring head 4 slides along the height direction is the height adjustment direction, the sliding direction of the width adjustment slider 3 is the same as the height adjustment direction, and the width adjustment direction, the height adjustment direction, and the sliding direction of the height adjustment slider 11 are perpendicular to each other.
[0044] The direction in which the measuring head 4 slides along the height direction is the height adjustment direction, and the sliding direction of the width adjustment slider 3 is the same as the height adjustment direction. Furthermore, the width adjustment direction, the height adjustment direction, and the sliding direction of the height adjustment slider 11 are perpendicular to each other. This can optimize the overall structure of the measuring instrument, so that the efficiency of the width adjustment and height adjustment of the measuring instrument can be improved under the premise that the overall structural layout of the measuring instrument is reasonable and compact.
[0045] In one embodiment, the height adjustment slider 11 includes a first sliding seat 14, a second sliding seat 15 and a third sliding seat 16, the main sliding wedge surface 12 includes a first main sliding wedge surface 17, a second main sliding wedge surface 18 and a third main sliding wedge surface 19, the first main sliding wedge surface 17 is arranged on the first sliding seat 14, the second main sliding wedge surface 18 is arranged on the second sliding seat 15, and the third main sliding wedge surface 19 is arranged on the third sliding seat 16; the slave sliding wedge surface 13 includes a first slave sliding wedge surface 20, a second slave sliding wedge surface 21 and a third slave sliding wedge surface 22, the first slave sliding wedge surface 20 is arranged at the bottom of one of the measuring heads 4, the second slave sliding wedge surface 21 is arranged at the bottom of the other measuring head 4, and the third slave sliding wedge surface 22 is arranged at the bottom of the transmission block 7; the first main sliding wedge surface 17 cooperates with the first slave sliding wedge surface 20, the second main sliding wedge surface 18 cooperates with the second slave sliding wedge surface 21, and the third main sliding wedge surface 19 cooperates with the third slave sliding wedge surface 22.
[0046] When the height of the measuring head 4 is adjusted, the height adjustment slider 11 is driven to move in the front-rear direction by the height adjustment screw 10, and the lifting and lowering of the measuring head 4 is achieved by the cooperation between the main sliding wedge surface 12 and the secondary sliding wedge surface 13, that is, the height adjustment of the measuring head 4. Specifically, the height adjustment slider 11 includes three interconnected sliding seats, namely, a first sliding seat 14, a second sliding seat 15 and a third sliding seat 16. The overall structure of the height adjustment slider 11 is Y-shaped, and the three sliding seats are respectively three branches of the Y-shaped structural member, such as Figure 4 As shown; specifically, the main sliding wedge surface 12 includes a first main sliding wedge surface 17, a second main sliding wedge surface 18 and a third main sliding wedge surface 19. The first main sliding wedge surface 17 is arranged on the first sliding seat 14, the second main sliding wedge surface 18 is arranged on the second sliding seat 15, and the third main sliding wedge surface 19 is arranged on the third sliding seat 16. Therefore, the height adjustment screw 10 drives the height adjustment slider 11 to move, the height adjustment slider 11 drives the first sliding seat 14, the second sliding seat 15 and the third sliding seat 16 to move, and the first sliding seat 14, the second sliding seat 15 and the third sliding seat 16 drive the first main sliding wedge surface 17, the second main sliding wedge surface 18 and the third main sliding wedge surface 19 to move. Further, as Figure 4As shown, the slave sliding wedge surface 13 includes a first slave sliding wedge surface 20, a second slave sliding wedge surface 21 and a third slave sliding wedge surface 22. The first slave sliding wedge surface 20 is arranged at the bottom of one of the measuring heads 4, the second slave sliding wedge surface 21 is arranged at the bottom of the other measuring head 4, and the third slave sliding wedge surface 22 is arranged at the bottom of the transmission block 7. Therefore, when the height adjustment slider 11 drives the first main sliding wedge surface 17, the second main sliding wedge surface 18 and the third main sliding wedge surface 19 to move, the first main sliding wedge surface 17 cooperates with the first slave sliding wedge surface 20, the second main sliding wedge surface 18 cooperates with the second slave sliding wedge surface 21, and the third main sliding wedge surface 19 cooperates with the third slave sliding wedge surface 22, so that the sliding motion of the height adjustment slider 11 in the front-to-back direction is converted into the lifting and lowering motion of the measuring head 4 through the wedge surface cooperation, that is, it is converted into the height adjustment of the measuring head 4. Among them, three main sliding wedge surfaces 12 and three slave sliding wedge surfaces 13 are provided, which are equivalent to three sliding support points, which can not only achieve a compact structure, but also improve the sliding stability of the measuring head 4.
[0047] In one embodiment, a sliding groove 23 is provided on the measuring frame 1, a connecting rod 24 is connected to the height adjustment slider 11, a height indicating needle 25 is provided at one end of the connecting rod 24 passing through the sliding groove 23, a height scale value 26 is provided on the measuring frame 1, and the height indicating needle 25 is provided corresponding to the height scale value 26; a width scale value 27 is provided on the measuring frame 1, a width indicating needle 28 is provided on the measuring head 4, and the width indicating needle 28 is provided corresponding to the width scale value 27.
[0048] When the height of the measuring head 4 is adjusted by the height adjustment slider 11, the height of the measuring head 4 needs to be adjusted to the height of the prosthesis so that the pressure of the femur and tibia at the height of the prosthesis can be measured by the measuring instrument. Therefore, a height scale value 26 and a height indicator needle 25 are set on the measuring frame 1 to adjust the height of the measuring head 4 to the required height. Figure 4 , Figure 5 and Figure 7 As shown, a sliding groove 23 is provided on the measuring frame 1, and a connecting rod 24 is provided on the height adjustment slider 11. One end of the connecting rod 24 is connected to the height adjustment slider 11, and the other end of the connecting rod 24 passes through the sliding groove 23 and is connected to a height indicating needle 25. Therefore, the height indicating needle 25 connected to the height adjustment slider 11 through the connecting rod 24 can move with the movement of the height adjustment slider 11. A height scale value 26 is provided on the measuring housing. The height indicating needle 25 is set corresponding to the height scale value 26. The measuring head 4 can be adjusted to the required height by reading the height indicating needle 25, wherein the range of the height scale value 26 covers the height range of the prosthesis, so as to achieve the universality of all prostheses through one measuring instrument; and the length of the sliding groove 23 is greater than the sliding range of the height adjustment slider 11. In addition, as Figure 5 and Figure 7 As shown, a width scale value 27 is provided on the measuring frame 1, and a width indicator needle 28 is provided on the measuring head 4. The width indicator needle 28 is set corresponding to the width scale value 27. The two measuring heads 4 can be adjusted to the required width by reading the width indicator needle 28, wherein the range of the width scale value 27 covers the distance range between the two osteotomy surfaces of femurs of different specifications, so as to achieve the universality of all femoral widths through one measuring instrument.
[0049] In one embodiment, a mounting groove 29 and a contact member 30 are provided on the measuring head 4 , and a pressure sensor 37 is detachably provided between the mounting groove 29 and the contact member 30 .
[0050] The measuring head 4 is provided with a pressure sensor 37, and the pressure of the femur and tibia in the extension position and the flexion position is measured by the pressure sensor 37. Figure 6 As shown, the measuring head 4 is provided with a mounting groove 29 and a contact piece 30. The pressure sensor 37 can be installed in the mounting groove 29, and the pressure sensor 37 is limited in the mounting groove 29 by the contact piece 30. After use, the pressure sensor 37 can be removed according to actual needs. Furthermore, both sides of the measuring head 4 are provided with limit slots 33 along the height adjustment direction, and two sliding connecting rods 34 are provided on the contact piece 30. The sliding connecting rod 34 can be slidably arranged in the corresponding limit slots 33, and a sliding card slot 35 is provided on the sliding connecting rod 34, and a limit buckle 36 is provided on the limit slot 33. The sliding card slot 35 on the sliding connecting rod 34 is engaged with the limit buckle 36 on the measuring head 4, and the limit buckle is set with a preset length along the height adjustment direction, allowing the contact piece 30 to have a certain displacement along the height adjustment direction through the cooperation of the sliding connecting rod 34 and the sliding card slot 35. When the measuring instrument is in use, the top end of the contact piece 30 abuts against the osteotomy surface of the femur, and the bottom end of the measuring frame 1 of the measuring instrument abuts against the osteotomy surface of the tibia. The contact piece 30 squeezes the pressure sensor 37 to obtain the pressure value between the femur and the tibia in the extended position and the flexed position through the pressure sensor 37 to perform a balance assessment. The contact member 30 is light in weight and does not affect the pressure measurement of the pressure sensor 37 .
[0051] In one embodiment, it further includes a circuit board assembly and a terminal. The circuit board assembly is provided with a data storage module and a signal transmission module. The circuit board assembly is communicatively connected with the terminal.
[0052] The measuring instrument also includes a circuit board assembly and a terminal (not shown in the figure). The pressure data collected by the pressure sensor 37 can be saved in the data storage module, and the signal transmission module can transmit the saved pressure data to the terminal, and the terminal can visualize the pressure data, thereby improving the convenience of use. Among them, the transmission method can adopt a signal transmission method such as Bluetooth.
[0053] In one embodiment, a measuring handle 38 is further included, and the measuring handle 38 is detachably connected to the measuring frame 1 .
[0054] A measuring handle 38 is connected to the measuring frame 1 , and the user holds the measuring handle 38 to move the measuring instrument, and the measuring handle 38 can be removed for replacement.
[0055] In one embodiment,
[0056] Taking the figure as an example, the specific working principle is as follows:
[0057] (1) Width adjustment
[0058] Rotate the width adjustment screw 2, and convert the rotational motion of the width adjustment screw 2 into the sliding motion of the width adjustment slider 3 along the vertical direction through the first screw mechanism. The sliding parts 5 on both sides of the width adjustment slider 3 convert the sliding motion of the width adjustment slider 3 along the vertical direction into the sliding motion of the measuring head 4 along the width adjustment direction through the cooperation with the sliding groove 6, so as to adjust the distance between the two measuring heads 4.
[0059] (2) Height adjustment
[0060] The height adjustment screw 10 is rotated, and the rotational motion of the height adjustment screw 10 is converted into the sliding motion of the height adjustment slider 11 along the front-to-back direction through the second screw mechanism. The main sliding wedge surface 12 on the height adjustment slider 11 cooperates with the measuring head 4 and the slave sliding wedge surface 13 on the transmission block 7 to convert the sliding motion of the height adjustment slider 11 along the front-to-back direction into the sliding motion of the measuring head 4 along the width adjustment direction, so as to adjust the relative height of the two measuring heads 4.
[0061] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention is described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims
1. A knee joint soft tissue balance measuring instrument, characterized in that: The invention comprises a measuring frame (1), on which a width adjustment screw rod (2) is rotatably arranged, on which a width adjustment slider (3) and two measuring heads (4) are slidably arranged, the width adjustment screw rod (2) and the width adjustment slider (3) form a first screw mechanism, both sides of the width adjustment slider (3) are provided with sliding parts (5), and the measuring heads (4) are provided with sliding grooves (6), the sliding parts (5) are slidably arranged in the corresponding sliding grooves (6), and the sliding parts (5) drive the two measuring heads (4) to move relatively closer or farther away through the sliding grooves (6).
2. The knee joint soft tissue balance measuring instrument according to claim 1, characterized in that: The sliding groove (6) is an inclined groove, the inclination direction of the sliding groove (6) is along the direction in which the measuring heads (4) are relatively approaching or moving away, the symmetry plane between the two measuring heads (4) is a first plane, and the sliding grooves (6) on the two measuring heads (4) are symmetrically arranged with respect to the first plane.
3. The knee joint soft tissue balance measuring instrument according to claim 2, characterized in that: The direction in which the measuring head (4) moves relatively closer or farther away is the width adjustment direction, and the sliding direction of the width adjustment slider (3) is arranged perpendicular to the width adjustment direction.
4. The knee joint soft tissue balance measuring instrument according to claim 3, characterized in that: The measuring frame (1) is provided with a transmission block (7), and transmission pins (8) are provided on both sides of the transmission block (7). The measuring head (4) is provided with a transmission groove (9), and the transmission pin (8) is inserted into the corresponding transmission groove (9), and the axis of the transmission groove (9) is along the width adjustment direction.
5. The knee joint soft tissue balance measuring instrument according to claim 4, characterized in that: A height adjustment screw (10) is rotatably provided on the measuring frame (1), and a height adjustment slider (11) is slidably provided on the measuring frame (1). The height adjustment screw (10) and the height adjustment slider (11) form a second screw mechanism. A main sliding wedge surface (12) is provided on the height adjustment slider (11), and a secondary sliding wedge surface (13) is provided on the measuring head (4). The main sliding wedge surface (12) and the secondary sliding wedge surface (13) are slidably matched. The height adjustment sliding block drives the measuring head (4) to slide along the height direction through the matching of the main sliding wedge surface (12) and the secondary sliding wedge surface (13).
6. The knee joint soft tissue balance measuring instrument according to claim 5, characterized in that: At least three main sliding wedge surfaces (12) are provided, the number of the secondary sliding wedge surfaces (13) is the same as that of the main sliding wedge surfaces (12), the slope and height of each main sliding wedge surface (12) are the same, the slope and height of each secondary sliding wedge surface (13) are the same, and the main sliding wedge surface (12) and the secondary sliding wedge surface (13) have the same slope.
7. The knee joint soft tissue balance measuring instrument according to claim 5, characterized in that: The direction in which the measuring head (4) slides along the height direction is the height adjustment direction, the sliding direction of the width adjustment slider (3) is the same as the height adjustment direction, and the width adjustment direction, the height adjustment direction and the sliding direction of the height adjustment slider (11) are perpendicular to each other.
8. The knee joint soft tissue balance measuring instrument according to claim 5, characterized in that: The height adjustment slider (11) comprises a first sliding seat (14), a second sliding seat (15) and a third sliding seat (16); the main sliding wedge surface (12) comprises a first main sliding wedge surface (17), a second main sliding wedge surface (18) and a third main sliding wedge surface (19); the first main sliding wedge surface (17) is arranged on the first sliding seat (14), the second main sliding wedge surface (18) is arranged on the second sliding seat (15), and the third main sliding wedge surface (19) is arranged on the third sliding seat (16); the slave sliding wedge surface (13) comprises a first slave sliding wedge surface (20), a second slave sliding wedge surface (18) and a third main sliding wedge surface (19); The invention relates to a second slave sliding wedge surface (21) and a third slave sliding wedge surface (22), wherein the first slave sliding wedge surface (20) is arranged at the bottom of one of the measuring heads (4), the second slave sliding wedge surface (21) is arranged at the bottom of the other measuring head (4), and the third slave sliding wedge surface (22) is arranged at the bottom of the transmission block (7); the first main sliding wedge surface (17) cooperates with the first slave sliding wedge surface (20), the second main sliding wedge surface (18) cooperates with the second slave sliding wedge surface (21), and the third main sliding wedge surface (19) cooperates with the third slave sliding wedge surface (22).
9. The knee joint soft tissue balance measuring instrument according to any one of claims 5 to 8, characterized in that: The measuring frame (1) is provided with a sliding groove (23), the height adjustment slider (11) is connected with a connecting rod (24), one end of the connecting rod (24) passing through the sliding groove (23) is provided with a height indicating needle (25), the measuring frame (1) is provided with a height scale value (26), and the height indicating needle (25) is provided corresponding to the height scale value (26); the measuring frame (1) is provided with a width scale value (27), and the measuring head (4) is provided with a width indicating needle (28), and the width indicating needle (28) is provided corresponding to the width scale value (27).
10. The knee joint soft tissue balance measuring instrument according to any one of claims 1 to 8, characterized in that: The measuring head (4) is provided with a mounting groove (29) and a contact piece (30), and a pressure sensor (37) is detachably provided between the mounting groove (29) and the contact piece (30).