A fixing device for a tension sensor during unicompartmental knee arthroplasty

Abstract

The present invention discloses a fixing device for a tension sensor in unicompartmental knee replacement, belonging to the field of medical devices, and comprising: a pad, a support member and a connecting member, wherein: the pad comprises a crimping end and a load-bearing end away from the crimping end, the crimping end squeezes the tension sensor along a crimping direction, and the crimping end is provided with a positioning member for connecting the tension sensor; the supporting member is connected to the pad, the supporting member has a supporting arm, the supporting arm squeezes the tension sensor along a supporting direction, and the supporting direction is opposite to the crimping direction; the connecting member comprises a supporting plate and a positioning plate, the supporting plate is connected to the supporting arm, the positioning plate is connected to the proximal end of the tibia, and the supporting plate squeezes the tension sensor along the supporting direction. Through the above-mentioned arrangement, the present invention can effectively prevent the pad from being separated from the tension sensor during use, thereby avoiding the measurement accuracy of the tension sensor from being affected.

Description

Technical Field

[0001] The invention belongs to the technical field of medical devices, and in particular relates to a fixing device for a tension sensor in unicompartmental knee replacement. Background Art

[0002] Knee osteoarthritis is a common orthopedic disease in the middle-aged and elderly. Unicompartmental knee replacement is one of the important surgical options at present, which can effectively relieve patients' knee pain and the postoperative efficacy can satisfy patients. However, unicompartmental knee replacement has high requirements for surgical techniques, and the flexion and extension balance still depends on the subjective evaluation of the surgeon, which has an important impact on the surgical efficacy and complication rate. By placing a wireless tension sensor between the patient's femoral condyle and the knee joint, it can effectively and objectively evaluate the pressure on the gasket under different flexion and extension states during the operation, so that the unicompartmental knee replacement can truly achieve flexion and extension balance, improve surgical efficacy and postoperative satisfaction, reduce the incidence of complications such as gasket dislocation and prosthesis loosening, and increase the confidence of patients and surgeons in the operation, and reduce the adverse effects of the procedure on patients and surgeons. In addition, the development of surgical techniques and auxiliary tools for unicompartmental knee replacement can promote this procedure more widely, while retaining the patient's own knee joint structure as much as possible, and solving the problems of knee pain and walking difficulties for more patients with minimal trauma. However, during clinical testing, the wireless tension sensor may be lifted or separated from the gasket, which will significantly affect the accuracy of the wireless tension sensor measurement and the application and promotion of the technology and method.

[0003] Therefore, a fixing device is designed that can effectively prevent the tension sensor from having a reduced measurement accuracy due to uneven force during use. The fixing device is specifically a fixing device for the tension sensor in unicompartmental knee replacement. Summary of the invention

[0004] In order to overcome the problem that the current tension sensor is unevenly stressed and has low measurement accuracy due to warping or separation when connected to the existing gasket, the present invention adopts the following technical solution:

[0005] A fixing device for a tension sensor in unicompartmental knee replacement surgery comprises a pad, a support member and a connecting member, wherein: the pad comprises a crimping end and a load-bearing end away from the crimping end, the crimping end squeezes the tension sensor along a crimping direction, and the crimping end is provided with a positioning member for connecting the tension sensor; the supporting member is connected to the pad, the supporting member has a supporting arm, the supporting arm squeezes the tension sensor along a supporting direction, and the supporting direction is opposite to the crimping direction; the connecting member comprises a supporting plate and a positioning plate, the supporting plate is provided with a connecting groove, the supporting arm can enter the connecting groove in the assembly direction, the positioning plate is connected to the proximal end of the tibia, and the supporting plate squeezes the tension sensor along the supporting direction.

[0006] Furthermore, the bearing end has a concave socket, and the concave socket bears the femoral condyle. When the femoral condyle rotates, it is always limited by the concave socket, which can prevent the femoral condyle from slipping off the pad. When the femoral condyle rotates, the force position of the concave socket generally remains unchanged, so that the influence of the tension sensor can be reduced when the femoral condyle moves.

[0007] Optionally, there is a bottom position in the recess, and the bottom position is at the lowest point of the recess along the crimping direction. When the contact position between the femoral condyle and the pad is the bottom position, the crimping end of the pad fits with the tension sensor; when the femoral condyle has a tendency to move away from the recess and away from the bottom position, the pad that squeezes the tension sensor has a tendency to tilt up, and at this time the tension sensor drives the support member connected to the pad along the squeezing direction to weaken the tendency of the pad to separate from the tension sensor;

[0008] Optionally, the pad has a plurality of edges, each edge being provided with a rounded corner.

[0009] Furthermore, the crimping end has a crimping plane, and the crimping plane is perpendicular to the crimping direction, thereby increasing the contact area with the tension sensor, so that the end of the tension sensor in contact with the pad is evenly stressed;

[0010] Optionally, the number of the positioning members is at least two;

[0011] Optionally, the positioning member is integrally connected to the backing plate, and the positioning member is plug-connected or clip-connected to the tension sensor along the crimping direction;

[0012] Alternatively, the positioning member is detachably connected to the backing plate, and the positioning member is bolted or plugged to the tension sensor along the crimping direction.

[0013] Furthermore, the number of the supporting arms is two, and one end of each supporting arm facing away from the pad contacts and presses the tension sensor along the supporting direction;

[0014] Optionally, the two supporting arms are parallel.

[0015] Furthermore, the support member further comprises a reinforcing rod, the number of the supporting arms is two, and both ends of the reinforcing rod are respectively connected to a supporting arm, so that the two supporting arms are subjected to uniform force when squeezed by the tension sensor;

[0016] Optionally, the central axis of the reinforcing rod is perpendicular to the crimping direction;

[0017] Optionally, the plane where the central axis of the reinforcing rod lies is parallel to the central axes of the two supporting arms;

[0018] Optionally, the number of the reinforcing rod is at least one. When there are more than one reinforcing rod, the central axes of adjacent reinforcing rods are parallel to each other.

[0019] Furthermore, baffles are mirror-disposed on the support plate, a support channel is provided between the baffles, the support channel has an assembly direction, the tension sensor can reciprocate in the support channel along the assembly direction, and the assembly direction is parallel to the central axis of the support arm.

[0020] Optionally, a bending portion is provided at one end of the baffle away from the support plate, and the bending portion is bent into the support channel to prevent the tension sensor from escaping from the support channel in a direction away from the support plate;

[0021] Optionally, the height of the supporting channel is not greater than the maximum thickness of the tension sensor.

[0022] Optionally, when the support arm enters the connection groove along the assembly direction, the upper end surface of the support arm and the upper end surface of the support plate are in the same plane, so that the support arm and the support plate can contact and squeeze the tension sensor at the same time;

[0023] Optionally, along the assembly direction, the length of the connecting groove is greater than the length of the supporting arm to prevent the pad from being unable to properly dock with the femoral condyle due to the excessive length of the supporting arm after the positioning plate positions the connector.

[0024] Furthermore, the positioning plate is an arc-shaped plate, and a positioning hole is provided through the outer wall of the positioning plate, so that the arc-shaped plate can abut against the outer wall of the proximal end of the tibia, and a positioning nail can be inserted into the tibia through the positioning hole;

[0025] Optionally, a plurality of reinforcing bosses are provided on the outer wall of the positioning plate, and the positioning hole passes through the reinforcing bosses and the positioning plate;

[0026] Optionally, the central axes of each of the positioning holes are not parallel to each other, so as to improve the connection stability of the positioning plate when it is subjected to interference from external forces in a single direction during use;

[0027] Optionally, the positioning plate is connected to an end of the supporting plate away from the supporting member;

[0028] Optionally, the positioning plate is perpendicular to the supporting plate;

[0029] Optionally, the inner wall of the positioning hole is smooth;

[0030] Alternatively, the positioning hole is provided with a thread.

[0031] Furthermore, the connecting member further comprises a connecting rod, one end of which is connected to the positioning plate, and the other end of which is connected to the supporting plate;

[0032] Optionally, there are at least two connecting rods, and each connecting rod has a different length so as to adapt to a positioning plate with a curvature.

[0033] Furthermore, the crimping end portion is parallel to the supporting plate.

[0034] Beneficial effects of the present invention:

[0035] 1. By setting a support member and a pad, the two opposite sides of the sensor are respectively in contact with the crimping end and the support arm. When the femoral condyle is separated from the bottom position and drives the pad to separate from the tension sensor, the support arm drives the tension sensor along the tilting direction of the pad, and the tension sensor and the pad are always squeezed by the femoral condyle and the proximal end of the tibia to prevent the pad from separating from the tension sensor, thereby reducing the influence on the measurement accuracy of the tension sensor when the pad is not in the correct position, thereby making the promotion and application of unicompartmental knee replacement smoother.

[0036] 2. By setting up a support plate and a positioning plate, an insertion channel based on the patient's bones is provided for the tension sensor, and when the pad is pressed in the wrong position, the end of the tension sensor that deviates from the pad is prevented from tilting up under the drive of the support arm. When the pad has a tendency to separate from the tension sensor, the support plate indirectly squeezes and drives the support arm by fixing the position of the tension sensor so that the support arm has a movement tendency in the crimping direction. The movement tendency is opposite to the movement tendency direction when the pad is tilted, so that the pad moves in the crimping direction or has a tendency to move in the crimping direction, thereby maintaining the pad in a position of fitting contact with the tension sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. 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 labor. Among them:

[0038] Figure 1 This is a schematic diagram of the overall structure of one viewing angle of Embodiment 1 of the present invention;

[0039] Figure 2 This is a schematic diagram of the overall structure of another perspective of Embodiment 1 of the present invention;

[0040] Figure 3 It is a schematic diagram of the overall structure of one viewing angle after the backing plate and the supporting member are assembled in Example 1 of the present invention;

[0041] Figure 4 It is a schematic diagram of the overall structure of another perspective after the backing plate and the supporting member are assembled in Embodiment 1 of the present invention;

[0042] Figure 5 It is a schematic diagram of the overall structure of one perspective of the connecting piece in the present invention;

[0043] Figure 6 It is a schematic diagram of the overall structure of another perspective of the connecting piece in the present invention;

[0044] Figure 7 It is a schematic diagram of the overall structure when the tension sensor is assembled and placed at the surgical site in Embodiment 1 of the present invention;

[0045] Figure 8 is Figure 7 The schematic cross-sectional structure diagram;

[0046] Figure 9 is Figure 8 The enlarged structure diagram at position A in;

[0047] Figure 10 It is a schematic diagram of the assembly structure of the backing plate, the support member and the reinforcing rod in Embodiment 2 of the present invention;

[0048] Figure 11 It is a schematic diagram of the overall structure of one perspective after the backing plate, the support member, the reinforcing rod and the tension sensor are assembled in Embodiment 2 of the present invention;

[0049] Figure 12 It is a schematic diagram of the overall structure of another perspective after the backing plate, the support member, the reinforcing rod and the tension sensor are assembled in Embodiment 2 of the present invention;

[0050] Figure 13 It is a schematic diagram of the overall structure of Embodiment 2 of the present invention;

[0051] In the figure, 1. backing plate; 11. crimping end; 111. positioning member; 112. crimping plane; 1121. connection hole; 12. bearing end; 121. concave; 1211. bottom position; 13. crimping direction; 2. support member; 21. support arm; 22. support direction; 23. reinforcing rod; 3. connecting piece; 31. support plate; 311. baffle; 3111. bent portion; 312. support channel; 313. assembly direction; 314. connection groove; 32. positioning plate; 321. positioning hole; 322. reinforcing boss; 33. connecting rod; 4. tension sensor. Detailed implementation manners

[0052] The technical solutions in the embodiments of the present invention are described clearly and completely below through specific embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation methods. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0053] Example 1

[0054] A fixing device for a tension sensor 4 in unicompartmental knee replacement, such as Figure 1 , Figure 2 , Figure 3 , Figure 7 As shown, it includes: a pad 1, a support member 2 and a connecting member 3, wherein: the pad 1 includes a crimping end 11 and a load-bearing end 12 away from the crimping end 11, the crimping end 11 squeezes the tension sensor 4 along a crimping direction 13, and the crimping end 11 is provided with a positioning member 111 for connecting the tension sensor 4; the supporting member 2 is connected to the pad 1, the supporting member 2 has a supporting arm 21, the supporting arm 21 squeezes the tension sensor 4 along a supporting direction 22, and the supporting direction 22 is opposite to the crimping direction 13; the connecting member 3 includes a supporting plate 31 and a positioning plate 32, the supporting plate 31 is provided with a connecting groove 314, the supporting arm 21 can enter or detach from the connecting groove 314 in the assembly direction, the supporting plate 31 and the supporting arm 21 are both abutted against the bottom end of the tension sensor 4, the positioning plate 32 is connected to the proximal end of the tibia, and the proximal end of the tibia It is a component of the knee joint, and the front edge of the proximal tibia faces the doctor during surgery; the support plate 31 squeezes the tension sensor 4 along the support direction 22, so that when the pad 1 has a tendency to tilt, the separation tendency between the pad 1 and the tension sensor 4 can be reduced by applying a force in the same direction as the tilting direction of the pad 1 to the tension sensor 4, but this can only improve the connection stability between the tension sensor 4 and the pad 1. When the femoral condyle moves toward the edge of the pad 1, the pressure applied by the femoral condyle is too great, which may cause the tension sensor 4 and the pad 1 to tilt at the same time, and there is still a tendency for separation between the tension sensor 4 and the pad 1; by setting the connecting piece 3, on the basis of using the tension sensor itself to limit the movement of the pad 1, the movement range of the tension sensor can also be limited, thereby preventing the tension sensor and the pad 1 from tilting at the same time.

[0055] A more preferred embodiment is as follows Figure 1 , Figure 2 , Figure 5 , Figure 7As shown, the load-bearing end 12 has a recess 121, and the recess 121 is used to simulate the tibial tray. The surface of the femoral condyle is an arc surface with a single curvature radius. The contact area with the femoral condyle is increased by setting the recess 121, thereby reducing the pressure at the contact point between the recess 121 and the femoral condyle, and reducing the wear of the femoral condyle. Since the surface of the femoral condyle is not a smooth sphere, the contact position and contact area with the recess 121 will be different when the femoral condyle rotates. This is the reason why the pad 1 is subjected to uneven force and warping, and it is also the reason why the pressure data of the femoral condyle on the tibial tray can be measured by the tension sensor 4 when the patient's knee joint is flexed and extended to different angles. When the patient's knee joint flexes and extends during surgery, the femoral condyle will be driven to rotate about the recess 121. The femoral condyle is always limited by the recess 121 during rotation, which can prevent the femoral condyle from slipping off the pad 1, and the force position of the recess 121 generally remains unchanged when the femoral condyle rotates. Therefore, the position where the femoral condyle applies pressure to the recess 121 is mainly concentrated at the bottom of the recess 121, thereby reducing the influence on the tension sensor when the femoral condyle moves; the recess 121 is specifically a sunken curved surface, and the recess 121 has a bottom end position 1211, and the bottom end position 1211 is located in the recess 12 1 is at the lowest point along the crimping direction 13. When the contact position between the femoral condyle and the pad 1 is the bottom position 1211, the force direction of the femoral condyle on the pad 1 is perpendicular to the crimping plane 112. At this time, the pressure applied by the femoral condyle to the pad 1 can be evenly distributed on the tension sensor 4 through the pad 1, so that the crimping end 11 of the pad 1 and the tension sensor 4 can be stably fitted; when the femoral condyle has a movement tendency away from the concave 121 and leaves the bottom position 1211, the force direction of the femoral condyle on the pad 1 is not perpendicular to the crimping plane 112, and the pressure on the pad 1 cannot be evenly distributed on the tension sensor 4. One end of the contact crimping plane 112 makes the pad 1 that squeezes the tension sensor 4 have a tendency to tilt up. At this time, the tension sensor 4 drives the supporting member 2 connected to the pad 1 along the squeezing direction to weaken the tendency of the pad 1 and the tension sensor 4 to separate. Specifically, after the tension sensor 4 is installed between the femoral condyle and the front end of the tibia along the assembly direction 313 with the assistance of the fixing device, when the patient's knee joint is flexed, the femoral condyle will roll forward in the recess 121 along the assembly direction 313; when the patient's knee joint is extended, the femoral condyle will roll backward in the recess 121 against the assembly direction 313, and the femoral condyle will roll backward in the recess 121 against the assembly direction 313. When the condyle rolls along the assembly direction 313, it approaches the edge of the recess 121 away from the support 2, and at this time, the end of the pad 1 close to the support 2 has a tendency to tilt; when the femoral condyle rolls against the assembly direction 313, it approaches the support 2, and at this time, the end of the pad 1 away from the support 2 has a tendency to tilt, but when the femoral condyle rolls along the assembly direction 313, the tilting tendency of the pad 1 is greater, and the tilting tendency of the pad 1 relative to the tension sensor 4 increases, which will cause the gap between the pad 1 and the tension sensor 4 to expand, and the normal use of the tension sensor 4 will be more affected.The backing plate 1 also has a plurality of edges, and each edge is provided with a rounded corner to prevent repeated damage to the surrounding tissues of the proximal tibia of the patient during surgery.

[0056] A more preferred embodiment is that, as Figure 2 , Figure 4 , Figure 8 , Figure 9 shown, a connecting hole 1121 is further provided at the bottom end of the crimping plane 112. The connecting hole 1121 is a counterbore. The top end of the tension sensor 4 has a protrusion corresponding to the connecting hole 1121. When the backing plate 1 is in contact with the tension sensor 4, the connecting hole 1121 is engaged with the protrusion. During use, the bottom end of the tension sensor 4 is in contact with the tibial plateau formed on the front end of the tibia. The shape of the protrusion at the top end of the tension sensor 4 is specifically one of a spherical shape, a frustum shape, a cylindrical shape, or a hemispherical shape. The shape of the inner wall of the counterbore corresponds to the shape of the protrusion.

[0057] A more preferred embodiment is that, as Figure 1 , Figure 2 , Figure 9 shown, the crimping end 11 has a crimping plane 112. The crimping plane 112 is perpendicular to the crimping direction 13, so as to increase the contact area with the tension sensor 4 and make the force on the end of the tension sensor 4 in contact with the backing plate 1 uniform; the number of the positioning members 111 is at least two. The positioning members 111 are symmetrically distributed on the crimping end 11. The positioning members 111 are integrally connected to the backing plate 1. The positioning members 111 are inserted or snapped into connection with the tension sensor 4 along the crimping direction 13.

[0058] Another more preferred embodiment is that the positioning member 111 is detachably connected to the backing plate 1. The positioning member 111 is bolted or inserted into connection with the tension sensor 4 along the crimping direction 13.

[0059] A more preferred embodiment is that, as Figure 1 , Figure 7 , Figure 9 shown, the number of the support arms 21 is two. One end of each support arm 21 facing away from the backing plate 1 contacts and presses the tension sensor 4 along the support direction 22. The end of the tension sensor 4 in contact with the support arm 21 is opposite to the end in contact with the backing plate 1; the two support arms 21 are parallel, and the structures of the two support arms 21 are the same. The support arms 21 extend from the support member 2 and specifically present an L-shaped or T-shaped structure. The end of the support arm 21 in contact with the tension sensor 4 and the end of the support plate 31 in contact with the tension sensor 4 are in the same plane, so that the support arm 21 and the support plate 31 can be uniformly stressed when contacting the tension sensor 4.

[0060] A more preferred embodiment is that, as Figure 5 , Figure 6 , Figure 7As shown, baffles 311 are mirror - set on the support plate 31. There is a support channel 312 between the baffles 311. An assembly direction 313 is defined within the support channel 312. The tension sensor 4 can reciprocate within the support channel 312 along the assembly direction 313, and the assembly direction 313 is parallel to the central axis of the support arm 21. The baffles 311 are integrally connected to the support plate 31 and are elastic to facilitate the assembly and disassembly of the tension sensor 4 with the support plate 31. A bent portion 3111 is provided at one end of the baffle 311 facing away from the support plate 31. The bent portion 3111 bends towards the support channel 312 to prevent the tension sensor 4 from disengaging from the support channel 312 in the direction away from the support plate 31. Or, the end faces of the bent portions 3111 on both sides facing away from the baffle 311 are parallel to each other, which can also prevent the tension sensor 4 from disengaging from above. More specifically, the height of the support channel 312 is not greater than the maximum thickness of the tension sensor 4 to prevent the tension sensor 4 from shaking up and down within the support channel 312.

[0061] A more preferred embodiment is, as Figure 1 、 Figure 5 、 Figure 6 、 Figure 9 shown, a connection groove 314 is provided on the support plate 31. The support arm 21 can enter the connection groove 314 along the assembly direction 313. The connection groove 314 can and can only allow the support arm 21 to slide along the assembly direction 313. The provision of the connection groove 314 can also prevent the support arm 21 from rotating around the assembly direction 313, which can effectively avoid the extrusion tension of the femoral condyle on the backing plate 1 from being too inclined and affecting the measurement accuracy of the tension sensor 4, thereby improving the measurement accuracy of the tension sensor 4. When the support arm 21 enters the connection groove 314 along the assembly direction 313, the upper end surface of the support arm 21 and the upper end surface of the support plate 31 are in the same plane, so that the support arm 21 and the support plate 31 can simultaneously contact and squeeze the tension sensor 4. Along the assembly direction 313, the length of the connection groove 314 is greater than the length of the support arm 21 to prevent the backing plate 1 from not being able to be normally docked with the femoral condyle due to the excessive length of the support arm 21 after the positioning plate 32 positions the connecting member 3.

[0062] A more preferred embodiment is, as Figure 5 、 Figure 6As shown, the positioning plate 32 is an arc-shaped plate, and a positioning hole 321 is penetrated on the outer wall of the positioning plate 32. The arc-shaped plate can abut against the front edge of the proximal end of the tibia, and the positioning nail can be inserted into the tibia through the positioning hole 321; a plurality of reinforcing bosses 322 are provided on the outer wall of the positioning plate 32, and the positioning hole 321 penetrates the reinforcing boss 322 and the positioning plate 32. The reinforcing boss 322 is cylindrical, and a chamfer or reinforcing rib is provided at the contact point with the arc-shaped plate, so as to improve its service life; the central axis of each positioning hole 321 is not parallel to each other, so that the positioning nail has a different forward direction when inserted, which can improve the connection stability of the positioning plate 32 when it is used and is interfered by an external force in a single direction.

[0063] A more preferred embodiment is as follows Figure 5 , Figure 6 As shown, the positioning plate 32 is connected to the end of the supporting plate 31 away from the supporting member 2 and the positioning plate 32 is perpendicular or non-perpendicular to the supporting plate 31; the inner wall of the positioning hole 321 is smooth, and the positioning pin used is sleeved in the positioning hole 321 and is in contact with or not in contact with the inner wall of the positioning hole 321; or, the positioning hole 321 is provided with a thread, and the positioning pin rotates and advances in the positioning hole 321 and has a more stable fixing performance.

[0064] Another more preferred embodiment is that the positioning plate 32 is rotatably connected to the support plate 31 and a locking member is provided between the positioning plate 32 and the support plate 31, so that the angle between the positioning plate 32 and the support plate 31 can be flexibly adjusted according to the spatial position relationship between the proximal front edge of the tibia and the tibial platform during actual operation, and the angle can also be locked at a certain rotation angle.

[0065] A more preferred embodiment is as follows Figure 1 , Figure 6 , Figure 9 As shown, the connecting member 3 further includes a connecting rod 33, one end of which is connected to the positioning plate 32, and the other end of which is connected to the support plate 31; more specifically, there are at least two connecting rods 33, each of which has a different length, and each of which has the same or different shapes, so as to adapt to the positioning plate 32 with an arc and help to strengthen the connection strength between the positioning plate 32 and the support plate 31. The crimping end 11 is parallel to the support plate 31 to ensure that the upper and lower end surfaces of the tension sensor 4 are as parallel as possible.

[0066] During use, the patient lies flat, with the patient's knees straight or bent. The doctor first dissects the surrounding tissues at the patient's knee joint, exposing the femoral condyles and the front end of the tibia, and cutting a tibial plateau for contacting the tension sensor 4 on the end of the tibia facing the femoral condyles. After combining the tension sensor 4 and the backing plate 1 through the positioning member 111, they are inserted into the joint cavity between the femoral condyles and the front end of the tibia. After the tension sensor 4 and the backing plate 1 enter the joint cavity, the concave socket 121 can adaptively adjust its position in the joint cavity under the extrusion of the femoral condyles when contacting the femoral condyles; then, based on the positions of the tension sensor 4 and the backing plate 1, the abutting position of the positioning plate 32 against the front end of the tibia is determined, and further the drilling position and direction of the positioning hole 321 are determined. After the positioning hole 321 is drilled, the connecting member 3 is fixed to the front end of the tibia with a fixing nail. Refer to Figure 1 , Figure 5 , Figure 6 , Figure 7 , Figure 9 .

[0067] Embodiment 2

[0068] A fixing device for a tension sensor 4 during unicompartmental knee arthroplasty, as shown in Figure 13 , includes: a backing plate 1, a supporting member 2 and a connecting member 3, where: the backing plate 1 includes a crimping end 11 and a bearing end 12 facing away from the crimping end 11. The crimping end 11 extrudes the tension sensor 4 along a crimping direction 13, and the crimping end 11 is provided with a positioning member 111 for connecting the tension sensor 4; the supporting member 2 is connected to the backing plate 1, the supporting member 2 has a supporting arm 21, the supporting arm 21 extrudes the tension sensor 4 along a supporting direction 22, and the supporting direction 22 is opposite to the crimping direction 13; the connecting member 3 includes a supporting plate 31 and a positioning plate 32, the supporting plate 31 is connected to the supporting arm 21, the positioning plate 32 is connected to the front edge of the proximal tibia, and the supporting plate 31 extrudes the tension sensor 4 along the supporting direction 22.

[0069] Different from Embodiment 1, in this embodiment, as shown in Figure 10 , Figure 11 , Figure 12 , Figure 13As shown, the support member 2 further includes a reinforcing rod 23. The reinforcing rod 23 is used to connect the support arms 21 and form a more stable force arm when under pressure. Specifically, the number of support arms 21 is two. The two ends of the reinforcing rod 23 are respectively connected to one support arm 21, so that the two support arms 21 are evenly stressed when squeezed by the tension sensor 4. The central axis of the reinforcing rod 23 is perpendicular to the crimping direction 13. The plane where the central axis of the reinforcing rod 23 is located is parallel to the central axes of the two support arms 21. The number of the reinforcing rods 23 is at least one. When there are more than one reinforcing rod 23, the central axes of adjacent reinforcing rods 23 are parallel to each other. During use, after the support arms 21 and the support plate 31 are combined, the reinforcing rod 23 is passed through the support arms 21. The support arms 21 and the reinforcing rod 23 are connected by insertion. One end face of the reinforcing rod 23 after connecting the support arms 21 abuts against the support plate 31, so as to provide a supporting effect for the support plate 31 and more effectively fit the tension sensor 4 and the backing plate 1 when the backing plate 1 has a tendency to tilt.

Claims

1. A device for fixing a tension sensor in unicompartmental knee replacement, characterized in that: include: A backing plate, comprising a crimping end and a load-bearing end away from the crimping end, the crimping end pressing the tension sensor along a crimping direction, the crimping end being provided with a positioning piece for connecting the tension sensor; A support member connected to the backing plate, the support member having a support arm, the support arm pressing the tension sensor along a support direction, the support direction being opposite to the crimping direction; The connecting member includes a supporting plate and a positioning plate, wherein the supporting plate is provided with a connecting groove, wherein the supporting arm can enter or leave the connecting groove in the assembly direction, wherein the positioning plate is connected to the proximal end of the tibia, and wherein the supporting plate compresses the tension sensor along the supporting direction; The positioning plate is an arc-shaped plate, and positioning holes are provided through the outer wall of the positioning plate, and the central axes of each positioning hole are not parallel to each other; The bearing end has a recess, and the recess supports the femoral condyle. When the femoral condyle rotates, it is always limited by the recess; there is a bottom position in the recess, and when the contact position between the femoral condyle and the pad is the bottom position, the crimping end of the pad fits with the tension sensor; when the femoral condyle has a tendency to move away from the recess and leaves the bottom position, the pad that squeezes the tension sensor has a tendency to tilt up, and at this time the tension sensor drives the support connected to the pad along the extrusion direction to weaken the tendency of the pad to separate from the tension sensor.

2. The fixing device for a tension sensor in unicompartmental knee replacement according to claim 1, characterized in that: The backing plate has a plurality of edges, each of which is provided with a rounded corner.

3. The fixing device for a tension sensor in unicompartmental knee replacement according to claim 1, characterized in that: The crimping end portion has a crimping plane, and the crimping plane is perpendicular to the crimping direction.

4. The fixing device for a tension sensor in unicompartmental knee replacement according to claim 3, characterized in that: The number of the positioning members is at least two.

5. The fixing device for a tension sensor in unicompartmental knee replacement according to claim 3, characterized in that: The positioning piece is connected to the backing plate as a whole, and the positioning piece is connected to the tension sensor by plugging or clamping along the crimping direction.

6. The fixing device for a tension sensor in unicompartmental knee replacement according to claim 3, characterized in that: The positioning piece is detachably connected to the backing plate, and the positioning piece is bolt-connected or plug-connected to the tension sensor along the crimping direction.

7. The fixing device for a tension sensor in unicompartmental knee replacement according to claim 1, characterized in that: There are two supporting arms, and one end of each supporting arm facing away from the pad contacts and presses the tension sensor along the supporting direction.

8. The device for fixing a tension sensor in unicompartmental knee replacement according to claim 7, characterized in that: The two supporting arms are parallel.

9. The fixing device for a tension sensor in unicompartmental knee replacement according to claim 1, characterized in that: The support member further comprises a reinforcing rod, the number of the supporting arms is two, and both ends of the reinforcing rod are respectively connected to a supporting arm.

10. A fixing device for a tension sensor in unicompartmental knee replacement according to claim 9, characterized in that: The central axis of the reinforcing rod is perpendicular to the crimping direction.

11. The fixing device for a tension sensor in unicompartmental knee replacement according to claim 9, characterized in that: The plane where the central axis of the reinforcing rod is located is parallel to the central axes of the two supporting arms.

12. The fixing device for a tension sensor in unicompartmental knee replacement according to claim 9, characterized in that: The number of the reinforcing rod is at least one. When there are more than one reinforcing rod, the central axes of adjacent reinforcing rods are parallel to each other.

13. The fixing device for a tension sensor in unicompartmental knee replacement according to claim 1, characterized in that: The support plate is mirror-imaged with baffles, a support channel is provided between the baffles, the support channel has an assembly direction, the tension sensor can reciprocate in the support channel along the assembly direction, and the assembly direction is parallel to the central axis of the support arm.

14. The fixing device for a tension sensor in unicompartmental knee replacement according to claim 13, characterized in that: A bending portion is provided at one end of the baffle away from the supporting plate, and the bending portion is bent into the supporting channel.

15. The fixing device for a tension sensor in unicompartmental knee replacement according to claim 13, characterized in that: The height of the supporting channel is not greater than the maximum thickness of the tension sensor.

16. The fixing device for a tension sensor in unicompartmental knee replacement according to claim 6, characterized in that: When the supporting arm enters the connecting groove along the assembly direction, the upper end surface of the supporting arm and the upper end surface of the supporting plate are in the same plane.

17. A fixing device for a tension sensor in unicompartmental knee replacement according to claim 16, characterized in that: Along the assembly direction, the length of the connecting groove is greater than the length of the supporting arm.

18. The device for fixing a tension sensor in unicompartmental knee replacement according to claim 1, characterized in that: A plurality of reinforcing bosses are arranged on the outer wall of the positioning plate, and the positioning hole passes through the reinforcing bosses and the positioning plate.

19. A device for fixing a tension sensor in unicompartmental knee replacement according to claim 18, characterized in that: The positioning plate is connected to one end of the supporting plate away from the supporting member.

20. The fixing device for a tension sensor in unicompartmental knee replacement according to claim 18, characterized in that: The positioning plate is perpendicular to the supporting plate.

21. The device for fixing a tension sensor in unicompartmental knee replacement according to claim 18, characterized in that: The inner wall of the positioning hole is smooth.

22. The fixing device for a tension sensor in unicompartmental knee replacement according to claim 18, characterized in that: The positioning hole is provided with a thread.

23. The fixing device for a tension sensor in unicompartmental knee replacement according to claim 1, characterized in that: The connecting member further comprises a connecting rod, one end of which is connected to the positioning plate, and the other end of which is connected to the supporting plate.

24. The fixing device for a tension sensor in unicompartmental knee replacement according to claim 23, characterized in that: There are at least two connecting rods, and the lengths of the connecting rods are different.

25. The fixing device for a tension sensor in unicompartmental knee replacement according to claim 1, characterized in that: The crimping end portion is parallel to the support plate.

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