Tibia osteotomy positioner

Abstract

The tibia osteotomy positioner comprises a telescopic rod and further comprises a positioning assembly, an ankle holding device and an inclination angle adjusting assembly which are installed on the telescopic rod, the positioning assembly is used for fixing the end of a tibia, the inclination angle adjusting assembly comprises a base, a rotary knob, a swing rod and an osteotomy block installation plate, the base is arranged on the telescopic rod in a sleeved mode, and the distance between the base and the positioning assembly is adjustable. When the knob rotates, the lower end of the swing rod moves along the arc-shaped groove in the knob, the arc-shaped groove drives the lower end of the swing rod to be gradually away from or gradually close to the rotating center of the knob, and the upper end of the swing rod drives the osteotomy block mounting plate to incline. Adjustment can be carried out according to anatomical forms of different patients, meanwhile, caster angle multi-angle adjusting and positioning can be achieved, the requirements of different patients are met, the adjusting range is large, operation is easy, positioning is accurate, flexibility is high, the visualization space is large, and intraoperative measurement and position adjusting are convenient.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of medical apparatus and instruments, and particularly relates to a tibial bone osteotomy positioner. BACKGROUND

[0002] The knee joint is one of the biggest and most complex joints in the human body and is the most important joint in the human movement process. The development of the knee joint prosthesis system has a history of several decades. When the natural knee joint of the human body loses part or all functions due to diseases or injuries, etc., the knee joint prosthesis system needs to be replaced to reconstruct the normal function of the knee joint, reduce the pain and inconvenience of the patient, and implement the knee joint prosthesis system replacement surgery to achieve the best treatment effect and maximize the recovery of the patient's mobility.

[0003] Tibial bone osteotomy is an important part of knee replacement surgery. Precise osteotomy positioning tools can reduce the osteotomy deviation during surgery, causing post-osteotomy gap imbalance, reducing repeated measurement and osteotomy due to gap imbalance during surgery, and causing long surgery time, poor patient prognosis, and other problems. UTILITARY MODEL CONTENT

[0004] In view of the deficiencies of the prior art, the utility model provides a tibial bone osteotomy positioner which is convenient for tibial bone positioning and easy to adjust the post-osteotomy inclination angle, has high flexibility, and meets the needs of different patients.

[0005] To achieve the above-mentioned purpose, the utility model is realized by the following technical scheme:

[0006] A tibial bone osteotomy positioner comprises a telescopic rod, a positioning assembly, a knee holder, and an inclination angle adjusting assembly mounted on the telescopic rod. The positioning assembly comprises a horizontally arranged guide rail, a positioning block slidingly arranged on the guide rail, and a plurality of positioning needles mounted on the bottom surface of the positioning block. The guide rail is fixed on the telescopic rod, and the positioning block can move along the guide rail.

[0007] The inclination angle adjusting assembly comprises a base, a knob, a swing rod, and an osteotomy block mounting plate. The osteotomy block mounting plate is provided with an interface for mounting the osteotomy block. The base is sleeved on the telescopic rod and has an adjustable spacing with the positioning assembly. The base comprises a first base body and a second base body. The outer diameter of the first base body is larger than that of the second base body. The knob is rotatably sleeved on the second base body. The top surface of the knob is provided with an arc-shaped groove. The distance from one end of the arc-shaped groove to the other end gradually increases from the center of rotation of the knob. The first base body is provided with a notch. The swing rod is located in the notch. The upper end of the swing rod is fixedly connected with the osteotomy block mounting plate. The lower end of the swing rod is inserted into the arc-shaped groove. The middle part of the swing rod is movably connected with the first base body through a horizontally arranged pin shaft.

[0008] Preferably, the top surface of the knob is provided with a positioning bead, the bottom surface of the first base is provided with a plurality of positioning holes matched with the positioning bead, and the rotating degree of the knob is controlled by rotating the knob to make the positioning bead enter different positioning holes.

[0009] Preferably, the positioning assembly further comprises a third adjusting screw, the third adjusting screw is threadedly installed on the positioning block, and the positioning block is fixed when the third adjusting screw abuts against the guide rail.

[0010] Preferably, the telescopic rod is vertically arranged, the telescopic rod comprises a fixed rod and a movable rod, the top end of the fixed rod is inserted into the inner hole of the movable rod, the movable rod is provided with a first adjusting screw, one end of the first adjusting screw abuts against the fixed rod, the length of the fixed rod inserted into the inner hole of the movable rod is adjustable by rotating the first adjusting screw, the guide rail and the base are installed on the movable rod, and the ankle holder is installed on the fixed rod.

[0011] Preferably, the inclination angle adjusting assembly further comprises a second adjusting screw, the base is provided with a transverse threaded hole, the second adjusting screw is installed in the transverse threaded hole and abuts against the movable rod to lock the position of the base on the movable rod, and the height of the base on the movable rod is adjustable by loosening the second adjusting screw.

[0012] Preferably, the inclination angle adjusting assembly further comprises a pressing plate and a spring, the pressing plate and the osteotomy block mounting plate are both provided with through holes and are sleeved on the movable rod through the through holes, the pressing plate is hinged to the osteotomy block mounting plate at the end close to the joint and is provided with an abutting part for pressing the osteotomy block, and the spring has two ends respectively abutting against the end of the pressing plate away from the joint and the osteotomy block mounting plate.

[0013] The utility model has the following beneficial effects:

[0014] The tibial osteotomy positioner provided by the utility model is fixed with the ankle joint of the human body through the ankle holder, is fixed with the end of the tibia through the positioning assembly, the inclination angle of the osteotomy block mounting plate relative to the tibia is changed by adjusting the knob in the inclination angle adjusting assembly, so that the inclination angle after osteotomy is adjusted, the distance between the inclination angle adjusting assembly and the positioning assembly is adjustable, and the length of osteotomy is adjusted.

[0015] The horizontal position and height of the positioning needle are adjustable, the osteotomy height and the inclination angle are adjustable, the osteotomy length is adjustable according to different patient anatomical forms, the inclination angle is adjusted at multiple angles, the needs of different patients are met, the adjustment range is large, the operation is simple, the positioning is accurate, the flexibility is high, the visual space is large, and the position is convenient for intraoperative measurement and adjustment. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is the schematic view of the tibial osteotomy positioner provided by the utility model embodiment and installed on the tibia;

[0017] Figure 2It is a partial structural diagram of the tibial osteotomy locator;

[0018] Figure 3 yes Figure 2 A cross-sectional view of a partial structure of a tibial osteotomy locator;

[0019] Figure 4 It is a three-dimensional image of the base;

[0020] Figure 5 This is a diagram of the knob;

[0021] Figure 6 This is a top view of the knob. DETAILED DESCRIPTION

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0023] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0024] like Figures 1 to 6 As shown, this embodiment discloses a tibial osteotomy positioner, comprising a telescopic rod, and also comprising a positioning assembly 1, an ankle hugger 2 and an inclination adjustment assembly 3 installed on the telescopic rod. The ankle hugger 2 can be purchased on the market. The telescopic rod is vertically arranged, and the telescopic rod comprises a fixed rod 4 and a movable rod 5. The top end of the fixed rod 4 is inserted into the inner hole of the movable rod 5 (or the bottom end of the movable rod 5 is inserted into the inner hole of the fixed rod 4). A first adjusting screw 6 is installed in the transverse threaded hole on the movable rod 5. One end of the first adjusting screw 6 is against the fixed rod 4. By rotating the first adjusting screw 6, the length of the fixed rod 4 inserted into the inner hole of the movable rod 5 can be adjusted, thereby achieving adjustable length of the telescopic rod.

[0025] The positioning assembly 1 comprises a horizontally arranged guide rail 7 mounted at the top end of the fixed rod 4, a positioning block 8 slidingly arranged on the guide rail 7, a plurality of positioning pins 9 mounted at the bottom surface of the positioning block 8, and a third adjusting screw 10 threadedly mounted on the positioning block 8 and abutting against the guide rail 7 at one end. By loosening the third adjusting screw 10, the position of the positioning block 8 on the guide rail 7 can be changed. Specifically, the guide rail 7 in the embodiment is a T-shaped guide rail 7, and the positioning block 8 is provided with a T-shaped sliding groove, and the positioning block 8 is sleeved on the T-shaped guide rail 7 through the T-shaped sliding groove. According to the position of the tibial spine of the patient, the position of the positioning block 8 is adjusted by the third adjusting screw 10, so that the position of the positioning pins 9 is adjusted steplessly. In other embodiments, the guide rail 7 can also have other structures.

[0026] The inclination adjusting assembly 3 comprises a base 11, a knob 12, a second adjusting screw 13, a swing lever 14, a pressing plate 15, an osteotomy block mounting plate 17, a spring 18, and a clasp 19. The osteotomy block mounting plate 17 is provided with an interface 20 at one end for mounting an osteotomy block 16 (i.e. an osteotomy cutter), and the pressing plate 15 is hingedly connected to the osteotomy block mounting plate 17 at one end close to the interface 20 and is provided with a pressing portion 21 for pressing the osteotomy block 16. The pressing plate 15 and the osteotomy block mounting plate 17 are both provided with through holes for loosely sleeving on the movable rod 5, and the diameters of the through holes are greater than the outer diameter of the fixed rod 4, so that the pressing plate 15 and the osteotomy block mounting plate 17 have a space for tilting at a certain angle. The spring 18 abuts against one end of the pressing plate 15 away from the interface 20 and the osteotomy block mounting plate 17 at two ends, respectively. The spring 18 causes the one end of the pressing plate 15 away from the interface 20 to be raised, and the pressing portion 21 presses the osteotomy block 16. By pressing the pressing plate 15, the spring 18 is compressed, the osteotomy block 16 is released from the pressing of the pressing portion 21, and thus the osteotomy block 16 can be removed. In other embodiments, the osteotomy block 16 can also be fixed by other ways, for example, by screwing, and thus the pressing plate 15 and the spring 18 are not necessary.

[0027] The base 11 is sleeved on the movable rod 5, and the base 11 is provided with a transverse threaded hole. The second adjusting screw 13 is mounted in the transverse threaded hole and abuts against the movable rod 5 to lock the position of the base 11 on the movable rod 5. By loosening the second adjusting screw 13, the height of the base 11 on the movable rod 5 can be adjusted. The base 11 comprises a first base body 111 and a second base body 112. The outer diameter of the first base body 111 is greater than the outer diameter of the second base body 112. The knob 12 is sleeved on the second base body 112. The second base body 112 is provided with the clasp 19, and the bottom surface of the knob 12 abuts against the clasp 19. The top surface of the knob 12 abuts against the bottom surface of the first base body 111.

[0028] The top surface of the knob 12 is provided with an arcuate groove 22. The distance between this arcuate groove 22 and the knob 12's rotation center gradually increases from one end to the other. In other words, the arcuate groove 22 is a non-circular shape, such as a spiral or involute. A notch 113 is provided on the side of the first base 111. The rocker arm 14 is positioned within this notch 113. The upper end of the rocker arm 14 is fixedly connected to the osteotomy block mounting plate 17, while the lower end of the rocker arm 14 is inserted into the arcuate groove 22. The middle portion of the rocker arm 14 is movably connected to the first base 111 via a horizontally disposed pin 23. When the knob 12 is rotated, the lower end of the rocker arm 14 moves along the arcuate groove 22, which drives the lower end of the rocker arm 14 gradually away from or closer to the knob 12's rotation center, causing the rocker arm 14 to rotate about the pin 23. This causes the upper end of the rocker arm 14 to rotate the osteotomy block mounting plate 17, thereby adjusting the inclination angle of the osteotomy block 16, specifically the osteotomy tilt angle.

[0029] A positioning bead 24 is mounted on the top surface of the knob 12, and the bottom surface of the first base 111 is provided with a plurality of positioning holes 25 that match the positioning bead 24. By rotating the knob 12, the positioning bead 24 enters a different positioning hole 25, thereby controlling the degree of rotation of the knob 12. Each positioning hole 25 corresponds to a commonly used posterior tilt angle in tibial osteotomy surgery, such as 30° and 60°, and the knob is provided with scales corresponding to these angles.

[0030] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate from the spirit and scope of the technical solutions of the embodiments of the present invention. Therefore, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present invention.

Claims

1. A tibial osteotomy locator, characterized in that: The invention comprises a telescopic rod, a positioning assembly, an ankle holding device and an inclination adjustment assembly installed on the telescopic rod, the positioning assembly comprising a horizontally arranged guide rail, a positioning block slidably arranged on the guide rail, and a plurality of positioning pins installed on the bottom surface of the positioning block. The guide rail is fixed on the telescopic rod, and the positioning block can move along the guide rail. The inclination adjustment assembly includes a base, a knob, a rocker arm, and an osteotomy block mounting plate. The osteotomy block mounting plate is provided with an interface for installing the osteotomy block. The base is sleeved on the telescopic rod and the distance between the base and the positioning assembly is adjustable. The base includes a first base and a second base. The outer diameter of the first base is larger than the outer diameter of the second base. The knob is rotatably sleeved on the second base. The top surface of the knob is provided with an arc groove. The distance from one end of the arc groove to the other end and the rotation center of the knob gradually increases. A notch is provided on the side of the first base, and the rocker arm is located in the notch. The upper end of the rocker arm is fixedly connected to the osteotomy block mounting plate, and the lower end of the rocker arm is inserted into the arc groove. The middle part of the rocker arm is movably connected to the first base through a horizontally arranged pin shaft.

2. The tibial osteotomy locator according to claim 1, characterized in that: A positioning bead is installed on the top surface of the knob, and a plurality of positioning holes matching the positioning bead are provided on the bottom surface of the first base body. By rotating the knob, the positioning bead enters different positioning holes, thereby controlling the rotation degree of the knob.

3. The tibial osteotomy locator according to claim 1, characterized in that: The positioning assembly also includes a third adjusting screw, which is installed on the positioning block through a thread. When one end of the third adjusting screw presses against the guide rail, the positioning block is fixed. By loosening the third adjusting screw, the position of the positioning block on the guide rail can be moved.

4. The tibial osteotomy locator according to claim 1, characterized in that: The telescopic rod is arranged vertically and includes a fixed rod and a movable rod. The top end of the fixed rod is inserted into the inner hole of the movable rod. A first adjusting screw is installed on the movable rod. One end of the first adjusting screw is against the fixed rod. By rotating the first adjusting screw, the length of the fixed rod inserted into the inner hole of the movable rod can be adjusted. The guide rail and the base are installed on the movable rod, and the ankle hugger is installed on the fixed rod.

5. The tibial osteotomy locator according to claim 4, characterized in that: The inclination adjustment assembly also includes a second adjusting screw. A transverse threaded hole is provided on the base. The second adjusting screw is installed in the transverse threaded hole and abuts against the movable rod to lock the position of the base on the movable rod. By loosening the second adjusting screw, the height of the base on the movable rod can be adjusted.

6. The tibial osteotomy positioner according to claim 1, characterized in that: The inclination adjustment assembly also includes a pressure plate and a spring. Both the pressure plate and the osteotomy block mounting plate are provided with through holes and are sleeved on the movable rod through the through holes. The pressure plate is hinged to the osteotomy block mounting plate at one end close to the interface and is provided with a pressing portion for pressing the osteotomy block. The two ends of the spring respectively push the pressure plate away from the end of the interface and the osteotomy block mounting plate.

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