Arthroscopic joint space expansion device

Abstract

The present invention provides an arthroscopic joint space expansion device, comprising an upper clamp body and a lower clamp body, wherein the upper clamp body is hingedly connected to the lower clamp body, and the upper clamp body is divided into an upper clamp body inner section and an upper clamp body outer section with the hinge of the upper clamp body and the lower clamp body as the boundary, and the lower clamp body is divided into a lower clamp body inner section and a lower clamp body outer section with the hinge of the upper clamp body and the lower clamp body as the boundary, the end of the lower clamp body inner section is the tibia end, the end of the upper clamp body inner section is the femur end, and a tip is provided on the front side of the femur end of the upper clamp body. The device can enter the patient's body through an incision on the side of the knee joint under arthroscopy, and can expand the inner gap between the femur and the tibia, so as to facilitate the medial meniscus suturing operation.

Description

Technical Field

[0001] The invention relates to the technical field of bone and joint distraction medical devices, and in particular to an arthroscopic joint space distraction device. Background Art

[0002] When performing arthroscopic surgery on the medial meniscus, the most prominent difficulty is that the medial space between the femur and tibia is narrow and difficult to open for convenient surgical operation. Existing methods for increasing the operating space of the medial space between the femur and tibia are: one method is to have an assistant assist in everting the knee joint, but this method requires high physical strength and skills of the assistant, and sometimes it is difficult to achieve the purpose of increasing the medial compartment space; another method is to increase the medial space between the femur and tibia by loosening the medial collateral ligament of the knee joint, but this method will cause artificial damage to the medial collateral ligament and sometimes affect the stability of the knee joint. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide an arthroscopic joint space distraction device, which can effectively increase the medial space of the knee joint, facilitate various medial meniscus suturing operations, and does not require an assistant to assist in everting the knee joint. The surgeon can easily complete the operation alone.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0005] An arthroscopic joint space distraction device comprises an upper jaw body and a lower jaw body, wherein the upper jaw body is hingedly connected to the lower jaw body, and the upper jaw body is divided into an upper jaw body inner section and an upper jaw body outer section with the hinge between the upper jaw body and the lower jaw body as the boundary, and the lower jaw body is divided into a lower jaw body inner section and a lower jaw body outer section, the end of the lower jaw body inner section is the tibial end, and the end of the upper jaw body inner section is the femoral end, and a tip is provided on the front side of the femoral end of the upper jaw body.

[0006] Furthermore, the tip is in a conical shape.

[0007] Furthermore, the lower surface of the tibial end is provided with an upwardly concave abutting arc surface, and the abutting arc surface is an arc surface eccentrically arranged forward.

[0008] Furthermore, the cross-sectional shapes of the upper clamp body and the lower clamp body are both rectangular.

[0009] Furthermore, a first arc segment bent toward the rear is provided at the end of the inner section of the upper caliper body, and a second arc segment bent toward the rear is provided at the end of the inner section of the lower caliper body.

[0010] Further, the inner section of the upper caliper body is located on the right side of the outer section of the upper caliper body, and the inner section of the lower caliper body is located on the right side of the outer section of the lower caliper body; or, the inner section of the upper caliper body is located on the left side of the outer section of the upper caliper body, and the inner section of the lower caliper body is located on the left side of the outer section of the lower caliper body.

[0011] Furthermore, the upper clamp body and the lower clamp body are detachably hingedly connected.

[0012] Furthermore, the upper pliers body is provided with an opening groove / opening and closing pin at the hinge, and the lower pliers body is provided with an opening and closing pin / opening groove at the hinge, the top projection shape of the opening and closing pin is an I-shape, the shape of the opening groove is a U-shape, the opening width of the opening groove is the same as the middle diameter of the I-shaped opening and closing pin, and the opening groove is arranged at an angle and the opening is arranged relative to the opening and closing pin.

[0013] Furthermore, it also includes an opening mechanism, which includes a rack and an elastic member, a row of oblique teeth are provided on the inner surface of the rack, a V-shaped tip is provided at the end of the outer section of the lower pliers body, the oblique teeth on the rack are inclined in the direction away from the V-shaped tip, the upper end of the rack is hinged to the end of the outer section of the upper pliers body, and the lower end of the rack is always docked with the V-shaped tip at the end of the outer section of the lower pliers body under the elastic force of the elastic member.

[0014] Furthermore, the spreading mechanism also includes a fixing column and a cylindrical pin, the upper end of the fixing column is fixedly connected to the end of the outer section of the upper pliers body, the lower end of the fixing column is hinged to the upper end of the rack through the cylindrical pin, the elastic member is a spring sheet, the inner end of the spring sheet is fixed to the end of the outer section of the upper pliers body by a screw, and the outer end of the spring sheet is tilted and bent downward and rests on the outer corner of the upper end of the rack.

[0015] The beneficial effects of the present invention are as follows: the distraction device is used during the medial meniscus suturing operation under arthroscopy, and its function is to distract the medial gap between the femur and the tibia a little, so as to provide operating space for medical instruments such as suture devices, suture needles, and sutures during the medial meniscus suturing operation. During the operation, the upper clamp body and the lower clamp body of the distraction device are placed horizontally, and the inner section of the upper clamp body and the inner section of the lower clamp body enter the patient's body from the outer incision or approach, and after bypassing the anterior cruciate ligament, the tip on the femoral end of the upper clamp body is struck into the outer wall of the medial condyle of the femur, and the lower surface of the inner end of the lower clamp body is placed on the tibia. The outer section of the upper clamp body and the outer section of the lower clamp body are held and pinched by hand to distract the inner section of the upper clamp body and the inner section of the lower clamp body for a distance, so as to distract the medial gap between the femur and the tibia, which is convenient to operate and not easy to damage the patient's ligament. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1It is a front view of the arthroscopic joint space distraction device according to an embodiment of the present invention when the inner section of the upper clamp body is located on the right side of the outer section of the upper clamp body;

[0017] Figure 2 It is a top view of the arthroscopic joint space distraction device according to an embodiment of the present invention when the inner section of the upper clamp body is located on the right side of the outer section of the upper clamp body;

[0018] Figure 3 For the embodiment of the present invention Figure 1 AA partial cross-sectional view;

[0019] Figure 4 An exploded view of the arthroscopic joint space distraction device according to an embodiment of the present invention when the inner section of the upper clamp body is located on the right side of the outer section of the upper clamp body;

[0020] Figure 5 For the embodiment of the present invention Figure 4 B is a partial enlarged view;

[0021] Figure 6 It is a front view of the arthroscopic joint space distraction device according to an embodiment of the present invention when the inner section of the upper clamp body is located on the left side of the outer section of the upper clamp body;

[0022] Figure 7 It is a schematic diagram of the operation of the arthroscopic joint space distraction device according to an embodiment of the present invention when the inner section of the upper clamp body is located to the right of the outer section of the upper clamp body;

[0023] Figure 8 This is a schematic diagram of the operation of the arthroscopic joint space distraction device according to an embodiment of the present invention when the inner section of the upper clamp body is located to the left of the outer section of the upper clamp body during surgery.

[0024] Description of labels:

[0025] 1. Upper clamp body; 2. Lower clamp body; 3. Distraction mechanism; 4. Femur; 5. Tibia;

[0026] 11. Inner section of upper clamp body; 111. First arc section; 12. Outer section of upper clamp body; 13. Femoral end; 14. Tip; 141. Cone; 142. Cone frustum; 15. Opening groove; 16. Give way groove;

[0027] 21. Inner section of the lower clamp body; 211. Second arc section; 22. Outer section of the lower clamp body; 23. Tibial end; 231. Abutting arc surface; 24. Opening and closing pin; 25. V-shaped top;

[0028] 31. Rack; 32. Fixed column; 33. Cylindrical pin; 34. Spring piece. DETAILED DESCRIPTION

[0029] In order to explain the technical content, achieved objectives and effects of the present invention in detail, the following is an explanation in combination with the implementation modes and the accompanying drawings.

[0030] Please refer to Figures 1 to 8 , the embodiments provided by the present invention are:

[0031] An arthroscopic joint space distraction device comprises an upper clamp body 1 and a lower clamp body 2, wherein the upper clamp body 1 is hingedly connected to the lower clamp body 2, and the upper clamp body 1 is divided into an upper clamp body inner section 11 and an upper clamp body outer section 12, with the hinge between the upper clamp body 1 and the lower clamp body 2 as the boundary, and the lower clamp body 2 is divided into a lower clamp body inner section 21 and a lower clamp body outer section 22, the end of the lower clamp body inner section 21 is a tibial end 23, and the end of the upper clamp body inner section 11 is a femoral end 13, and a tip 14 is provided on the front side of the femoral end 13 of the upper clamp body 1.

[0032] The joint space dilator of the present application is used under arthroscopy to dilate the inner space between the femur and tibia on the knee joint to facilitate the operation of the medial meniscus suture. The upper clamp body 1 and the lower clamp body 2 are placed horizontally, and the distal ends of the inner section 11 of the upper clamp body and the inner section 21 of the lower clamp body extend into the knee joint. The tip 14 on the end of the inner section 11 of the upper clamp body is struck into the outer wall of the medial condyle of the femur by knocking, so that the femoral end 13 of the inner section 11 of the upper clamp body has a force point on the medial condyle of the femur, and the lower surface of the inner section 21 of the lower clamp body is supported on the upper surface of the tibia. The inner section 11 of the upper clamp body can be squeezed by hand by pinching the outer section 22 of the lower clamp body and the outer section 12 of the upper clamp body. The femoral end is separated from the tibial end of the medial section 21 of the lower clamp body, thereby realizing the expansion of the gap between the tibia and the medial femur. The medial section 11 of the upper clamp body and the medial section 21 of the lower clamp body can enter the patient's body from an outer incision or approach, and can also bypass the anterior cruciate ligament and reach the lateral wall of the medial femoral condyle from the femoral condyle fossa, thereby providing an effective device that is not prone to damaging the anterior cruciate ligament to expand the gap between the tibia and the medial femur, which is beneficial to improving the accuracy of surgical operations and the success rate of operations.

[0033] Furthermore, the tip 14 is conical in shape and has a sharp end, so as to be quickly driven into the lateral wall of the medial condyle of the femur.

[0034] Furthermore, the tip 14 includes a cone 141 and a truncated cone 142, the bottom of the cone 141 is smoothly connected to the top of the truncated cone 142, the bottom of the truncated cone 142 is smoothly connected to the front side of the femoral end 13 of the upper clamp body 1, and the inclination of the truncated cone 142 is smaller than the inclination of the cone 141. When the tip 14 is driven into the lateral wall of the medial condyle of the femur, the tip 14 of the cone 141 first enters the lateral wall of the medial condyle of the femur, and then the cone 141 is slowly and completely driven into the lateral wall of the medial condyle of the femur, and then the truncated cone 142 is partially driven into the lateral wall of the medial condyle of the femur. Since the inclination of the truncated cone 142 is small, the tip 14 of the distraction device can be firmly fixed on the lateral wall of the medial condyle of the femur during use and is not easy to fall out.

[0035] Furthermore, the lower surface of the tibial end 23 is provided with an upwardly concave abutting arc surface 231, and the lower surface of the tibial end 23 is supported by the abutting arc surface 231 on the tibial intercondylar eminence. Since the upper surface of the tibial intercondylar eminence is an arc surface, the upwardly concave abutting arc surface 231 is used to ensure that the tibial end 23 is in firm contact with the tibial intercondylar eminence.

[0036] Furthermore, the abutting arc surface 231 of the tibial end 23 of the lower clamp body 2 is an arc surface eccentrically arranged forward, so that the front side of the abutting arc surface 231 can forcefully abut against the tibial intercondylar crest, further making it difficult for the tibial end 23 to slide from the tibial intercondylar crest, thereby improving the support stability of the femoral end 13.

[0037] Furthermore, the radius of the abutting arc surface 231 is in the range of 3.5 to 7 mm, and its width is in the range of 3 to 5 mm, so that the tibial end 23 can be effectively abutted and supported on the tibial intercondylar eminence, and the tibial end 23 can easily bypass the anterior cruciate ligament and extend from the femoral condylar fossa into the tibial intercondylar eminence.

[0038] Furthermore, the cross-sectional shapes of the upper clamp body 1 and the lower clamp body 2 are both rectangular, which, on the one hand, enables the lower surface of the inner section 21 of the lower clamp body to contact the upper surface of the tibia firmly and not slip; on the other hand, it makes it difficult for a person to slip when holding the outer section 12 of the upper clamp body and the outer section 22 of the lower clamp body, thereby improving the stability of the surgical operation.

[0039] Furthermore, the cross-sectional area of ​​the upper clamp body 1 becomes smaller and smaller from the outer end to the inner end, and the cross-sectional area of ​​the lower clamp body 2 becomes smaller and smaller from the outer end to the inner end. When in use, since the human hand holds the upper clamp body outer section 12 and the lower clamp body outer section 22, the upper clamp body outer section 12 and the lower clamp body outer section 22 are relatively thick, so that the device structure is firm and the grip is comfortable. The upper clamp body inner section 11 and the lower clamp body inner section 21 need to enter the patient's body from the outer incision or approach, and also need to bypass the anterior cruciate ligament. Therefore, the upper clamp body inner section 11 and the lower clamp body inner section 21 are thinner, which can make the outer incision or approach smaller and is not easy to scratch the anterior cruciate ligament.

[0040] Furthermore, when the inner section 11 of the upper clamp body is close to the inner section 21 of the lower clamp body, the opening angle between the outer section 12 of the upper clamp body and the outer section 22 of the lower clamp body is the largest. When the inner section 11 of the upper clamp body and the inner section 21 of the lower clamp body enter the patient's body, in order to facilitate finding the force support points of the femoral end 13 and the tibial end 23, when the tip 14 is struck into the femur, it is preferably to bring the inner section 11 of the upper clamp body and the inner section 21 of the lower clamp body together. In this way, the upper and lower height range of the inner section 11 of the upper clamp body and the inner section 21 of the lower clamp body is the smallest, the amplitude of shaking in the patient's body is the smallest, and the impact on other tissues in the patient's body is the smallest. When it is necessary to open the inner section 11 of the upper clamp body and the inner section 21 of the lower clamp body, just pinch the outer section 12 of the upper clamp body and the outer section 22 of the lower clamp body towards the center with your hands.

[0041] Furthermore, the length range of the inner section 11 of the upper clamp body is 35 to 60 mm, and the length range of the inner section 21 of the lower clamp body is 35 to 60 mm. According to the different widths of the knee joints of different people, several specifications of joint space distraction devices can be made. For example, three specifications of joint space distraction devices are made, and the lengths of the inner section 11 of the upper clamp body and the inner section 21 of the lower clamp body are 35 mm, 47 mm, and 60 mm, respectively. Preferably, when the inner section 11 of the upper clamp body and the inner section 21 of the lower clamp body are inserted into the patient's body, the hinge between the upper clamp body 1 and the lower clamp body 2 is located outside the outer incision or approach. Since the upper and lower heights of the inner part of the device of the present application at the hinge between the upper clamp body 1 and the lower clamp body 2 are smaller, and the upper and lower heights of the outer part are larger, the hinge between the upper clamp body 1 and the lower clamp body 2 is located outside the outer incision or approach, so that the diameter of the outer incision or approach required during the operation is smaller.

[0042] Preferably, the length of the upper caliper body outer section 12 is 1.3 to 2.2 times the length of the upper caliper body inner section 11, and the length of the lower caliper body outer section 22 is 1.3 to 2.2 times the length of the lower caliper body inner section 21, so that the lever principle can be effectively utilized, and the upper caliper body inner section 11 and the lower caliper body inner section 21 can be separated effortlessly by pinching the upper caliper body outer section 12 and the lower caliper body outer section 22 by hand.

[0043] Furthermore, the end of the inner section 11 of the upper caliper body is provided with a first arc section 111 that bends backward, and the end of the inner section 21 of the lower caliper body is provided with a second arc section 211 that bends backward. The first arc section 111 and the second arc section 211 are designed to avoid the anterior cruciate ligament area so that the distraction device will not cause damage to the anterior cruciate ligament when in use. Specifically, the second arc section 211 is located below the first arc section 111, and the curvature of the two can be the same or different.

[0044] Further, the inner section 11 of the upper caliper body is located on the right side of the outer section 12 of the upper caliper body, and the inner section 21 of the lower caliper body is located on the right side of the outer section 22 of the lower caliper body. Figure 7 As shown, it is used to separate the inner gap between the femur and the tibia at the right knee joint of the patient a little, so as to facilitate the suturing operation of the inner meniscus at the right knee joint of the patient; or, the inner section 11 of the upper clamp body is located on the left side of the outer section 12 of the upper clamp body, and the inner section 21 of the lower clamp body is located on the left side of the outer section 22 of the lower clamp body, please refer to Figure 8 As shown, it is used to slightly separate the inner gap between the femur and the tibia at the patient's left knee joint, so as to facilitate the suturing operation of the inner meniscus at the patient's left knee joint.

[0045] Furthermore, the bending radius range of the first arc segment 111 is 24 to 40 mm, and the angle range of the central angle of the first arc segment 111 is 40 to 60°; the bending radius range of the second arc segment 211 is 26 to 43 mm, and the angle range of the central angle of the second arc segment 211 is 40 to 60°.

[0046] Furthermore, the first arc segment 111 is tangentially smoothly connected to other parts of the upper clamp body inner segment 11, and the second arc segment 211 is tangentially smoothly connected to other parts of the lower clamp body inner segment 21, so that the upper clamp body inner segment 11 and the lower clamp body inner segment 21 enter the knee joint from the anterolateral incision, which is convenient for observation with an arthroscopy and does not affect the operating space and observation space of other instruments during the medial meniscus suture operation. In addition, the inner segment of the distraction device has a smoother surface and is not easy to scratch the patient's internal tissues.

[0047] Furthermore, the total width of the femoral end 13 of the upper clamp body 1 ranges from 7 to 12 mm. The total width of the femoral end 13 of the upper clamp body 1 refers to the distance between the tip of the tip 14 and the posterior side of the femoral end 13, which determines the size of the required lateral incision or approach.

[0048] Furthermore, the shape of the outer section 12 of the upper pliers body is an upwardly concave arc with a radius of 190 to 250 mm; the shape of the outer section 22 of the lower pliers body is a downwardly concave arc with a radius of 190 to 250 mm, which is convenient for a person to grasp firmly.

[0049] Furthermore, the upper clamp body 1 and the lower clamp body 2 can be detachably hingedly connected. During the surgical operation, the upper clamp body 1 and the lower clamp body 2 can be successively inserted into the patient's body from the outer incision or approach, so that the diameter of the outer incision or approach is smaller, and the operating space required to bypass the anterior cruciate ligament to reach the specified position is small, the surgical success rate is high, and the patient's pain is reduced, making it easier for the patient to recover after the operation.

[0050] Furthermore, the upper pliers body 1 is provided with an opening groove / opening and closing pin at the hinge, and the lower pliers body 2 is provided with an opening and closing pin / opening groove at the hinge. The top projection shape of the opening and closing pin 24 is an I-shape, and the shape of the opening groove 15 is a U-shape. The opening width of the opening groove 15 is the same as the middle diameter of the I-shaped opening and closing pin 24. The opening groove 15 is inclined and the opening is arranged relative to the opening and closing pin 24.

[0051] After the inner section 11 of the upper jaw body and the inner section 21 of the lower jaw body are successively placed into the patient's body, the opening groove 15 is inserted into the middle part of the opening and closing pin 24 to achieve rapid and accurate merging of the upper jaw body 1 and the lower jaw body 2; the opening groove 15 is not only arranged relative to the opening and closing pin 24, but also arranged at an angle, so that the opening and closing pin 24 is firmly placed in the opening groove 15 and is not easy to fall out during the opening process of the expansion device.

[0052] Furthermore, the angle between the center line of the opening slot 15 and the horizontal line is in the range of 30° to 60°. Within this angle range, when the distraction device is used in surgery, the opening and closing pin 24 is not easy to fall out of the opening slot 15.

[0053] Preferably, the angle between the opening slot 15 and the horizontal line is 45°, which makes it easy to quickly separate and merge the upper clamp body 1 and the lower clamp body 2, and the opening and closing pin 24 is not easy to fall out of the opening slot 15 during surgery.

[0054] Furthermore, in order to avoid the two ends of the I-shaped opening and closing pin 24 , the front side surface and the rear side surface of the opening slot 15 are processed with a clearance groove 16 to provide space for the two ends of the opening and closing pin 24 .

[0055] Specifically, the diameter of the front end of the I-shaped opening and closing pin 24 is smaller than the diameter of the rear end, the shape of the clearance groove 16 on the front side of the opening groove 15 is U-shaped, and the shape of the clearance groove 16 on the rear side of the opening groove 15 is semicircular.

[0056] Furthermore, the I-shaped opening and closing pin 24 is formed by inserting the small head end of a T-shaped pin into a circular ring sheet and welding it.

[0057] Furthermore, the opening and closing pin 24 is welded on the upper caliper body 1 or the lower caliper body 2 .

[0058] Furthermore, it also includes an opening mechanism 3, which includes a rack 31 and an elastic member, a row of oblique teeth is provided on the inner surface of the rack 31, a V-shaped tip 25 is provided at the end of the outer section 22 of the lower caliper body, the oblique teeth on the rack 31 are inclined in the direction away from the V-shaped tip 25, the upper end of the rack 31 is hinged to the end of the outer section 12 of the upper caliper body, and the lower end of the rack 31 is always engaged with the V-shaped tip 25 at the end of the outer section 22 of the lower caliper body under the elastic force of the elastic member.

[0059] The oblique teeth on the rack 31 are inclined in the direction away from the V-shaped tip 25. When the outer section 12 of the upper forceps body and the outer section 22 of the lower forceps body are pinched by hand, the V-shaped tip 25 will move upward along the rack 31. When the hands are released and the pinching is no longer done, the V-shaped tip 25 will be stuck in a gap between the oblique teeth of the rack 31. The joint gap distraction device is in a distraction holding state, and the doctor can now perform a medial meniscus suture operation.

[0060] Furthermore, the opening mechanism 3 further includes a fixing column 32 and a cylindrical pin 33, wherein the upper end of the fixing column 32 is fixedly connected to the end of the outer section 12 of the upper caliper body, and the lower end of the fixing column 32 is hinged to the upper end of the rack 31 through the cylindrical pin 33. The upper end of the rack 31 is hingedly connected to the end of the outer section 12 of the upper caliper body through the fixing column 32 and the cylindrical pin 33.

[0061] Furthermore, the elastic member is a spring piece 34, the inner end of which is fixed to the end of the outer section 12 of the upper caliper body by a screw, and the outer end of the spring piece 34 is tilted and bent downward, and abuts against the outer corner of the upper end of the rack 31. Specifically, the distance from the outer corner of the upper end of the rack 31 to the central axis of the cylindrical pin 33 is greater than the distance from the outer side surface of the upper end of the rack 31 to the central axis of the cylindrical pin 33. When the rack 31 is in a vertical state, the outer end of the spring piece 34 abuts against the outer surface of the upper end of the rack 31, so that the rack 31 is always in contact with the V-shaped top 25. When the rack 31 is flipped outward and upward to a horizontal state, the rack 31 and the spring piece 34 are in a relatively parallel state, and the rack 31 is not affected by the elastic force of the spring piece 34. In this way, the splitting and merging of the upper caliper body 1 and the lower caliper body 2 are not affected by the opening mechanism 3, and the operation is more convenient.

[0062] Furthermore, the spring sheet is a bent spring sheet, and the angle range between the inner section and the outer section of the spring sheet 34 is 145° to 165°. Taking the bending point of the spring sheet as the boundary, the part of the spring sheet facing the inner section of the upper caliper body is called the inner section of the spring sheet, and the part of the spring sheet facing the outer section of the upper caliper body is called the outer section of the spring sheet.

[0063] Furthermore, the elastic member is a tension spring, one end of which is fixed to the outer section 12 of the upper caliper body, and the other end is fixed to the rack 31 . The tension spring is used to provide the rack 31 with a force to engage with the V-shaped top 25 .

[0064] Similarly, based on the symmetrical design, a V-shaped tip is provided at the end of the outer section 12 of the upper caliper body, the lower end of the rack 31 is hinged to the end of the outer section 22 of the lower caliper body, and the upper end of the rack 31 is also capable of docking with the V-shaped tip at the end of the outer section 12 of the upper caliper body.

[0065] In conjunction with the instruction manual Figure 7 , the use process of the distraction device of the present application for the medial meniscus surgery of the right knee joint of the patient is explained. During the surgery, the arthroscopy is supported, and an anterolateral incision is made in the patient's knee joint. The upper clamp body 1 and the lower clamp body 2 of the distraction device are separated, and the upper clamp body 1 and the lower clamp body 2 are placed horizontally. The inner section 11 of the upper clamp body and the inner section 21 of the lower clamp body are respectively introduced into the patient's body from the outer incision or approach, and after bypassing the anterior cruciate ligament, the upper clamp body 1 and the lower clamp body 2 are quickly assembled through the docking opening groove 15 and the opening and closing pin 24, and the inner section 11 of the upper clamp body and the inner section 21 of the lower clamp body are brought together, and then the tip 14 on the femoral end 13 of the upper clamp body 1 is driven into the outer wall of the medial condyle of the femur, the abutting arc surface 231 of the tibial end 23 abuts on the intercondylar ridge of the tibial bone, and the lower surface of the inner section 21 of the lower clamp body abuts on the upper surface of the tibia opposite to the shoulder socket of the femoral condyle, and the tooth is The rack 31 swings until it is docked with the V-shaped top 25 under the action of the elastic member. Hold and pinch the outer section 12 of the upper clamp body and the outer section 22 of the lower clamp body with your hand, and the V-shaped top 25 slides upward along the rack 31 to open a distance between the inner section 11 of the upper clamp body and the inner section 21 of the lower clamp body. After the distance is appropriate, the hand is released, and the V-shaped top 25 is locked in an oblique tooth gap of the rack 31, thereby realizing the opening of the inner gap between the femur 4 and the tibia 5. The operation is convenient, and it is not easy to damage the patient's ligaments, and does not affect the operating space and observation space for medial meniscus suturing. Next, the medial meniscus suturing operation is performed. After the medial meniscus is sutured, the rack 31 is swung upward and outward to a horizontal state, the tip 14 of the upper clamp body 1 is knocked out of the femur, the upper clamp body 1 is separated from the lower clamp body 2, and the upper clamp body 1 and the lower clamp body 2 are successively taken out from the anterior and lateral incisions.

[0066] Similarly, in conjunction with the instructions Figure 8 It can be observed that the distraction device of the present application is placed in the position during the medial meniscus surgery of the left knee joint of the patient, the tip 14 of the upper clamp body 1 hits the lateral wall of the medial condyle of the femur, the lower surface of the tibial end 23 is supported on the intercondylar ridge of the tibia, the medial section 11 of the upper clamp body and the medial section 21 of the lower clamp body can avoid the anterior cruciate ligament, hold and pinch the lateral section 12 of the upper clamp body and the lateral section 22 of the lower clamp body, and distract the medial section 11 of the upper clamp body and the medial section 21 of the lower clamp body to open a distance, so as to distract the medial gap between the femur 4 and the tibia 5, the surgical process is the same as the above, the operation is convenient, and it is not easy to damage the patient's ligament.

[0067] In summary, the arthroscopic joint spacer provided by the present invention has the following beneficial effects:

[0068] 1. The tip 14 of the femoral end 13 is inserted into the outer wall of the medial condyle of the femur, and the arc-shaped surface 231 of the tibial end 23 is supported at the intercondylar ridge of the tibia, providing a strong force point for the distraction device;

[0069] 2. Through the design of the upper clamp body 1 and the lower clamp body 2 and the distraction mechanism 3, the gap between the inner side of the femur and the tibia can be effectively enlarged by a simple hand-pinching action, and the gap will automatically remain in the distraction state after the gap is enlarged, so that the doctor can free up his hands to perform the medial meniscus suture operation;

[0070] 3. The upper clamp body 1 and the lower clamp body 2 can be disassembled and assembled through the opening groove 15 and the opening and closing pin 24. During the operation, they can be inserted into the patient's body and then assembled. The required operating space is small and the possibility of damaging the patient's body tissue is small;

[0071] 4. The external structure of the upper clamp body 1 and the lower clamp body 2 enables the distraction device to effectively avoid the anterior cruciate ligament and enter the patient's body through an incision set from the anterolateral side of the knee joint, while the medial meniscus suture is performed through an access opening on the anteromedial or posteromedial side of the knee joint, so that the distraction device does not affect the observation space and operation space required for the medial meniscus suture;

[0072] 5. The arthroscopic joint space distraction device of the present application is used to distract the medial space between the femur and the neck during medial meniscus suture surgery. It is labor-saving and convenient to use, and can accurately bypass the anterior cruciate ligament, thereby improving the success rate of medial meniscus suture surgery.

[0073] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent transformations made using the contents of the present invention's specification and drawings, or directly or indirectly applied in related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. An arthroscopic joint spacer, characterized in that: The invention comprises an upper jaw body and a lower jaw body, wherein the upper jaw body is hingedly connected to the lower jaw body, and the upper jaw body is divided into an upper jaw body inner section and an upper jaw body outer section with the hinge between the upper jaw body and the lower jaw body as the boundary, and the lower jaw body is divided into a lower jaw body inner section and a lower jaw body outer section, the end of the lower jaw body inner section is the tibial end, the end of the upper jaw body inner section is the femoral end, a tip is provided on the front side of the femoral end of the upper jaw body, a first arc section bent backwards is provided at the end of the upper jaw body inner section, a second arc section bent backwards is provided at the end of the lower jaw body inner section, and the shape of the tip is conical; The length of the inner section of the upper caliper body is in the range of 35 to 60 mm, and the length of the inner section of the lower caliper body is in the range of 35 to 60 mm; the first arc segment is tangentially connected to other parts of the inner section of the upper caliper body by smooth transition, and the second arc segment is tangentially connected to other parts of the inner section of the lower caliper body by smooth transition, the bending radius of the first arc segment is in the range of 24 to 40 mm, and the central angle of the first arc segment is in the range of 40 to 60°; the bending radius of the second arc segment is in the range of 26 to 43 mm, and the central angle of the second arc segment is in the range of 40 to 60°; The lower surface of the tibial end is provided with an upwardly concave abutting arc surface, the abutting arc surface is an arc surface eccentrically arranged forward, the radius of the abutting arc surface is in the range of 3.5 to 7 mm, and the width thereof is in the range of 3 to 5 mm; During the operation, the tip of the upper forceps on the femoral end is driven into the lateral wall of the medial femoral condyle, and the lower surface of the medial end of the lower forceps rests on the tibia. The upper pliers body and the lower pliers body are detachably hingedly connected, the upper pliers body is provided with an opening groove / opening and closing pin at the hinge, and the lower pliers body is provided with an opening and closing pin / opening groove at the hinge, the top projection shape of the opening and closing pin is an I-shape, the shape of the opening groove is a U-shape, the opening width of the opening groove is the same as the middle diameter of the I-shaped opening and closing pin, and the opening groove is inclined and the opening is arranged relative to the opening and closing pin.

2. The arthroscopic joint spacer according to claim 1, characterized in that: The cross-sectional shapes of the upper clamp body and the lower clamp body are both rectangular.

3. The arthroscopic joint spacer according to claim 1, characterized in that: The inner section of the upper caliper body is located on the right side of the outer section of the upper caliper body, and the inner section of the lower caliper body is located on the right side of the outer section of the lower caliper body; or, the inner section of the upper caliper body is located on the left side of the outer section of the upper caliper body, and the inner section of the lower caliper body is located on the left side of the outer section of the lower caliper body.

4. The arthroscopic joint spacer according to claim 1, characterized in that: It also includes an opening mechanism, which includes a rack and an elastic member, a row of oblique teeth is provided on the inner surface of the rack, a V-shaped top is provided at the end of the outer section of the lower pliers body, the oblique teeth on the rack are inclined in the direction away from the V-shaped top, the upper end of the rack is hinged to the end of the outer section of the upper pliers body, and the lower end of the rack is always docked with the V-shaped top at the end of the outer section of the lower pliers body under the elastic force of the elastic member.

5. The arthroscopic joint spacer according to claim 4, characterized in that: The expansion mechanism also includes a fixing column and a cylindrical pin, the upper end of the fixing column is fixedly connected to the end of the outer section of the upper pliers body, the lower end of the fixing column is hinged to the upper end of the rack through the cylindrical pin, the elastic member is a spring sheet, the inner end of the spring sheet is fixed to the end of the outer section of the upper pliers body by a screw, the outer end of the spring sheet is tilted and bent downward, and rests on the outer corner of the upper end of the rack.

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