Patellar trimming and fixation tools in knee replacement surgery

Abstract

A patellar trimming and fixation tool for knee replacement surgery is characterized in that it includes a tray for supporting the patella and a fixer with two ligament clamping parts. The tray of the fixer is provided with a concave cavity, which is larger at the top and smaller at the bottom. A support plate for supporting the ligament extends from the left and right sides of the outer periphery of the tray. A first handle also extends from the middle of the outer periphery of the tray. The two ligament clamping parts are respectively located on the left and right sides of the tray and correspond to each other, and bend and extend around the outer periphery of the tray. The left and right ligament clamping parts are each provided with a second handle. The two second handles are respectively located on both sides of the first handle and are hinged to the first handle so that the ligament clamping parts can cooperate with the support plate to clamp the ligament; the rear ends of the first handle and the second handle are both provided with finger rings.

Description

Technical Field

[0001] The present invention relates to a medical appliance, in particular to a patella repair and fixation tool in knee replacement surgery. Background Art

[0002] The patella, commonly known as the kneecap, is a sesamoid bone formed in the quadriceps tendon and the largest sesamoid bone in the body. It is flat, millet-shaped, and lies subcutaneously, making it easily palpable. It is broad at the top and pointed downwards at the bottom, with a rough front and a smooth back. It can move up and down, left and right. The patella articulates with the femur and forms part of the knee joint. The knee joint is a critical weight-bearing joint in the lower limb. Severe knee joint disease necessitates knee replacement surgery, which relieves pain, improves function, corrects deformities, and provides long-term stability. In previous knee replacement surgeries, patellar adjustment required using two towel clamps to hold the ligaments on both sides of the patella in opposite directions. This method of patellar fixation can easily cause partial tears in the patellar ligament. Furthermore, the resulting patella is unstable, hindering the surgical procedure, prolonging the repair time, and even resulting in failure. Summary of the Invention

[0003] In order to solve the problems existing in the above prior art, the present invention provides a patella repair and fixation tool in knee replacement surgery, which can stably fix the patella. The technical solution of the present invention is as follows:

[0004] A patellar trimming and fixation tool for knee replacement surgery includes a tray for supporting the patella and a fixer with two ligament clamping parts. The tray of the fixer is provided with a concave cavity, which is larger at the top and smaller at the bottom. A support plate for supporting the ligament extends from the left and right sides of the outer periphery of the tray. A first handle also extends from the middle of the outer periphery of the tray. The two ligament clamping parts are respectively located on the left and right sides of the tray and correspond to each other, and bend and extend around the outer periphery of the tray. The left and right ligament clamping parts are each provided with a second handle. The two second handles are respectively located on both sides of the first handle and are hinged to the first handle so that the ligament clamping parts can cooperate with the support plate to clamp the ligament; the rear ends of the first handle and the second handle are both provided with finger rings.

[0005] The tray is oval in shape, and the concave cavity of the tray is connected from top to bottom. The upper port and the lower port of the concave cavity are both oval in shape, the upper port of the concave cavity is larger than the lower port, and the inner wall of the concave cavity is used to support the patella.

[0006] When the first handle and the two second handles are clamped, the front end of the ligament clamping portion is located between the supporting plate and the front end of the tray.

[0007] The upper end surface of the supporting plate is perpendicular to the central axis of the tray and is lower than the upper end surface of the tray.

[0008] The front end surface of the ligament clamping portion is perpendicular to the axis of the second handle.

[0009] The surface of the ligament clamping portion opposite to the supporting plate is an arc surface, and the arc surface is bent toward the supporting plate, and the central angle corresponding to the arc surface is 30 to 40 degrees.

[0010] A stop arm is provided on the left and right sides of the first handle respectively, and a stop arm is provided on the side surfaces of the two second handles adjacent to the first handle respectively to cooperate with the stop arm of the first handle, and ratchets are provided on the stop arms.

[0011] The cross section of the ligament clamping portion is rectangular, and the width of the clamping surface of the ligament clamping portion is greater than the thickness of the ligament clamping portion.

[0012] The width of the second handle increases at the finger ring.

[0013] The above technical solution is adopted: it includes a tray for supporting the patella and a fixer with two ligament clamping parts. The tray of the fixer is provided with a concave cavity, which is larger at the top and smaller at the bottom. A support plate for supporting the ligament extends from the left and right sides of the outer periphery of the tray. A first handle also extends from the middle of the outer periphery of the tray. The two ligament clamping parts are respectively located on the left and right sides of the tray and correspond to each other, and extend around the outer periphery of the tray. The left and right ligament clamping parts are each provided with a second handle. The two second handles are respectively located on both sides of the first handle and are hinged to the first handle so that the ligament clamping parts can cooperate with the support plate to clamp the ligament. The rear ends of the first handle and the second handle are both provided with a finger ring. During knee replacement surgery, the patella is placed in the concave cavity of the tray. With the support of the tray, the patella is fixed more stably. The ligament is placed on the support plate and clamped by the two ligament clamping parts, so that local tearing of the patellar ligament will not occur. The present invention is simple and easy to use, has a simple structure, is easy to manufacture, and is convenient for implementation, promotion and application. Using the present invention in knee replacement surgery is conducive to the progress of the surgery, facilitates the medical staff to perform patellar trimming operations, shortens the trimming time, and greatly reduces the probability of surgical errors or even surgical failure.

[0014] When the first handle and the two second handles are clamped, the front end of the ligament clamping portion is located between the support plate and the front end of the tray, so as to prevent the ligament clamping portion from being too long and touching other human tissues.

[0015] The surface of the ligament clamping portion opposite to the support plate is an arc surface, and the arc surface is bent toward the support plate, which makes it easier to clamp the ligament. The central angle corresponding to the arc surface is 30 to 40 degrees.

[0016] A stop arm is provided on the left and right sides of the first handle respectively, and a stop arm is provided on the side of the two second handles adjacent to the first handle to cooperate with the stop arm of the first handle. The stop arms are provided with ratchets, and the first handle and the second handle can be fixed by the cooperation of the two stop arms.

[0017] The cross section of the ligament clamping portion is rectangular, and the width of the clamping surface of the ligament clamping portion is greater than the thickness of the ligament clamping portion, so as to prevent the shear force of the ligament clamping portion from being too large and causing the ligament to be clamped off.

[0018] The width of the second handle is increased at the finger ring, which makes it easier to hold, improves comfort, and avoids hand pain during use.

[0019] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the present invention;

[0021] Figure 2 for Figure 1 AA direction schematic diagram;

[0022] Figure 3 It is a structural schematic diagram when the first handle and the second handle are clamped. DETAILED DESCRIPTION

[0023] An embodiment of the patella repair and fixation tool in knee replacement surgery of the present invention:

[0024] See also Figure 1-Figure 3A patellar trimming and fixation tool for knee replacement surgery includes a tray 1 for supporting the patella and a fixture with two ligament clamping parts 2. The tray 1 of the fixture is provided with a concave cavity 3, which is larger at the top and smaller at the bottom. The tray 1 is elliptical, and the concave cavity 3 of the tray 1 is continuous from top to bottom. The upper and lower ends of the concave cavity 3 are both elliptical, with the upper end of the concave cavity 3 being larger than the lower end. The inner wall of the concave cavity 3 is a concave curved surface, and the inner wall of the concave cavity 3 is used to support the patella, while the lower end of the concave cavity 3 is used to make way for the protruding part of the patella. A support plate 4 for supporting the ligaments extends from the left and right sides of the outer periphery of the tray 1. The upper end surface of the support plate 4 is perpendicular to the central axis of the tray 1 and is lower than the upper end of the tray 1. A first handle 5 is also extended from the middle of the outer periphery of the tray 1. The two ligament clamping parts 2 are respectively located on the left and right sides of the tray 1 and correspond to each other, and are bent and extended around the outer periphery of the tray 1. The left and right ligament clamping parts 2 are each provided with a second handle 6. The two second handles 6 are respectively located on both sides of the first handle 5 and are hinged to the first handle 5, so that the ligament clamping part 2 can cooperate with the support plate 4 to clamp the ligament, and the two second handles 6 do not interfere with each other. In this way, the strength of the two second handles 6 to fix the ligament can be controlled separately. Because the thickness of the ligaments on the upper and lower sides of the patella is uneven, the strength applied by the ligament clamping part to fix the ligament needs to be adjusted with the different clamping depths of the second handles 6 on the same side; the rear ends of the first handle 5 and the second handle 6 are both provided with finger rings 7, and the holes of the finger rings of the first handle 5 and the second handle 6 do not overlap. The width of the second handle 6 is increased at the finger ring, which is convenient for holding, improves comfort, and avoids hand pain when using. A stop arm is provided on the left and right sides of the first handle 5, respectively. A stop arm is provided on each side of the two second handles 6 adjacent to the first handle 5 to cooperate with the stop arm of the first handle 5. The stop arms are provided with ratchets, and the first handle 5 and the second handle 6 can be fixed by the cooperation of the two stop arms. When the first handle 5 and the two second handles 6 are clamped, the front end of the ligament clamping part 2 is located between the support plate 4 and the front end of the tray 1 to prevent the ligament clamping part 2 from being too long and touching other human tissues. The front end surface of the ligament clamping part 2 is perpendicular to the axis of the second handle 6 to clamp as much ligament as possible. The surface of the ligament clamping part 2 opposite to the support plate 4 is an arc surface, and the arc surface is bent toward the support plate 4, which is more convenient for clamping the ligament. The central angle corresponding to the arc surface is 30 to 40°. In this embodiment, the central angle corresponding to the arc surface is 35°. The ligament clamping portion 2 has a rectangular cross-section, and the width of the clamping surface of the ligament clamping portion 2 is greater than its thickness, to prevent excessive shear force from the ligament clamping portion 2, which could cause the ligament to be severed. In this embodiment, the width of the clamping surface of the ligament clamping portion 2 is 6.5 mm, the thickness of the ligament clamping portion 2 is 4 mm, the height of the tray is 15 mm, the tray wall thickness is 5 mm, the major axis of the upper end of the tray outer wall is 60 mm, the minor axis of the upper end of the tray outer wall is 50 mm, the support plate 4 is 5 mm thick, and the first handle 5 is 120 mm long.The inner surface of the tray and the upper end surface of the support plate are polished to prevent pinching. The clamping surface of the ligament clamping part is roughened, which can stably fix the ligament during pressing and prevent the ligament from slipping. When performing knee replacement surgery, the patella is placed in the concave cavity 3 of the tray 1. With the support of the tray 1, the patella is fixed more stably. The ligament is placed on the support plate 4 and clamped by the two ligament clamping parts 2, so that local tearing of the patellar ligament will not occur. The present invention is simple and easy to use, has a simple structure, is easy to manufacture, and is easy to implement and promote. The use of the present invention in knee replacement surgery is conducive to the progress of the operation, facilitates the medical staff to perform patellar trimming operations, shortens the trimming time, and greatly reduces the probability of surgical errors or even surgical failure.

[0025] When performing knee replacement surgery, the patient's knee joint is first straightened to 180 degrees, and then the patella is turned outward. Then, the present invention is held in hand, and the patella is supported by the tray 1, so that the front of the patella is placed on the tray 1 with the joint surface facing up. The lower end of the tray 1 is used to make way for the front of the patella, and the patella is supported by the inner wall of the tray 1. At the same time, the ligament is placed on the support plate 4, and then the ligament surface is clamped with two ligament clamping parts 2. The two ligament clamping parts 2 can control the clamping force respectively, and then the position of the first handle 5 and the second handle 6 is fixed with the stop arm 8, and the patella can be trimmed.

Claims

1. A patellar trimming and fixation tool for knee replacement surgery, characterized by: The invention relates to a fixer comprising a tray (1) for supporting the patella and two ligament clamping parts (2), wherein the tray (1) of the fixer is provided with a concave cavity (3), wherein the concave cavity (3) is larger at the top and smaller at the bottom, and the tray (1) is elliptical, and the concave cavity (3) of the tray (1) is connected from top to bottom, and the upper end and the lower end of the concave cavity (3) are both elliptical, and the upper end of the concave cavity (3) is larger than the lower end, and the inner wall of the concave cavity (3) is used to support the patella, and a support plate (4) for supporting the ligament is extended from the left and right sides of the outer periphery of the tray (1), and a first handle (5) is further extended from the middle of the outer periphery of the tray (1), and the two ligament clamping parts (2) are respectively located on the left and right sides of the tray (1) and corresponding to the ligament clamping parts. , and bends and extends around the outer periphery of the tray (1), the surface of the ligament clamping portion (2) opposite to the support plate (4) is an arc surface, and the arc surface is bent toward the support plate (4), and the central angle corresponding to the arc surface is 30 to 40 degrees, the cross-section of the ligament clamping portion (2) is rectangular, and the width of the clamping surface of the ligament clamping portion (2) is greater than the thickness of the ligament clamping portion (2), the left and right ligament clamping portions (2) are each provided with a second handle (6), the two second handles (6) are respectively located on both sides of the first handle (5) and are hinged to the first handle (5), so that the ligament clamping portion (2) can cooperate with the support plate (4) to clamp the ligament; the rear ends of the first handle (5) and the second handle (6) are both provided with a finger ring (7).

2. The patella repair and fixation tool for knee replacement surgery according to claim 1, characterized in that: When the first handle (5) and the two second handles (6) are clamped, the front end of the ligament clamping portion (2) is located between the support plate (4) and the front end of the tray (1).

3. The patella repair and fixation tool for knee replacement surgery according to claim 1, characterized in that: The upper end surface of the support plate (4) is perpendicular to the central axis of the tray (1) and is lower than the upper end of the tray (1).

4. The patella repair and fixation tool for knee replacement surgery according to claim 1, characterized in that: The front end surface of the ligament clamping portion (2) is perpendicular to the axis of the second handle (6).

5. The patella repair and fixation tool for knee replacement surgery according to claim 1, characterized in that: A stop arm is provided on the left and right sides of the first handle (5), respectively. A stop arm is provided on the side surfaces of the two second handles (6) adjacent to the first handle (5) to cooperate with the stop arm of the first handle (5), and ratchets are provided on the stop arms.

6. The patella repair and fixation tool for knee replacement surgery according to claim 1, characterized in that: The width of the second handle (6) increases at the finger ring.

Images