Distraction device in artificial total knee arthroplasty

Abstract

The utility model discloses a distraction device in an artificial total knee arthroplasty, which relates to the technical field of medical equipment and is characterized in that a straight handle, a crank and a grab handle are arranged, so that when two splints are attached and clamped on two sides of a thighbone, the two splints can be distrained; the straight handle, the crank and the grab handle form a U-shaped structure with an outwards-expanded opening, a large operable space can be provided for the middle of the femur, the total knee joint of a patient can be conveniently installed and operated, medical staff can operate the grab handle to drive the rotating disc to rotate through the crank and the straight handle, and therefore the angles of the straight handle, the crank and the grab handle are adjusted, and operation is convenient. More space is reserved above the thighbone, so that the surgical operation of the artificial total knee arthroplasty is facilitated; through the arrangement of the connecting ball, the angle between the clamping plate and the connecting disc can be automatically adjusted, so that the clamping plate can be better attached to different parts of the thighbone of the patient, and subsequent installation of the artificial total knee joint is facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of medical equipment, in particular to a distraction device in artificial total knee replacement surgery. Background Art

[0002] The knee joint is composed of the lower end of the femur, the upper end of the tibia and the patella. It is the largest and most complex joint in the human body and is a trochlear joint.

[0003] The knee is a joint in the lower limbs. The knee joint is the connecting part between the thigh and the calf. The hip joint and the knee joint play an important role in the activities of the lower limbs, but they are also prone to related diseases. When medical staff perform surgery on the patient's knee joint, they need to use certain bone fixation devices to perform the surgery. However, when medical staff limit the patient's knee joint bones, the limiting effect is insufficient, which affects the medical staff's later surgical treatment of the patient. In addition, the operation is inconvenient when the bones are clamped and limited, which will cause loss of manpower and material resources and affect the progress of the operation. Therefore, a distraction device is needed for knee replacement surgery.

[0004] After searching, a Chinese utility model patent with application number "CN202122409933.4" discloses a distraction device for total knee replacement surgery, including a connecting plate, the end of which is fixedly connected to a frame, a connecting block is slidably connected to the frame, a round rod is fixedly connected at the center of the end of the frame, and a rectangular rod is fixedly connected to the end of the round rod.

[0005] In combination with the prior art, it is found that after the distraction device in the above-mentioned total knee replacement surgery distracts the surgical incision site, the distraction device itself occupies a certain space, especially the position above the distracted femur is easily blocked (or partially blocked), which is not conducive to the doctor's installation of the artificial total knee joint in the femur, and may easily affect the surgical efficiency of the total knee replacement surgery. In addition, the distraction device is not easy to adjust its own shape after forming the support, and is inconvenient to use. Therefore, a distraction device for total knee replacement surgery is needed. Utility Model Content

[0006] The purpose of the present application is to provide a distraction device for total knee replacement surgery to solve the problems raised in the above-mentioned background technology.

[0007] To achieve the above-mentioned purpose, the present application provides the following technical solutions: a distraction device in total knee replacement surgery, comprising two symmetrically arranged splints;

[0008] The outer sides of the two splints are rotatably connected to the connection disks through spherical bodies, the outer sides of the two connection disks are rotatably connected to the rotating disks, and the circumferences of the two rotating disks are fixed with straight handles;

[0009] The ends of the two straight handles away from the rotating disk are rotatably connected to cranks, the ends of the two cranks away from the straight handles are fixed with grips, the ends of the two grips close to the cranks are hinged to each other, and a compression spring is fixed between the two grips;

[0010] The single-sided straight handle, the crank handle and the grip form a "U"-shaped structure with an outward-expanding opening.

[0011] Preferably, a groove is provided on the side of the connecting disk away from the clamping plate, the rotating disk is located in the groove, and a notch connected to the groove is provided on the side of the connecting disk close to the rotating disk. The notch is fan-shaped, and the straight handle is located between the two sides of the notch.

[0012] Preferably, a limiting groove is provided in the groove of the connecting plate, and a plurality of limiting grooves are provided and distributed along the fan-shaped inner circumference of the notch;

[0013] A mounting hole is provided on one side of the rotating disk close to the connecting disk, and a movable limiting component matched with the limiting groove is installed in the mounting hole.

[0014] Preferably, the movable limiting assembly comprises a limiting column and a limiting spring;

[0015] The limiting column is movably embedded in the mounting hole and one end thereof extends into the limiting groove, and the end of the limiting column located in the limiting groove is in the shape of a hemisphere;

[0016] The end of the limiting column is elastically connected to the top wall of the mounting hole through a limiting spring.

[0017] Preferably, the spherical body is a connecting ball, which is rollingly embedded in the side wall of the splint close to the connecting disk, and the end point of the connecting ball away from the splint is fixed to the side wall of the connecting disk close to the splint.

[0018] Preferably, a flexible block is fixed to each side of the two clamping plates close to each other, and cylindrical ribs protrude from the surface of the flexible block.

[0019] In summary, the technical effects and advantages of the utility model are:

[0020] 1. In the utility model, through the arrangement of the straight handle, the crank and the grip, when the two splints are fitted and clamped on both sides of the femur, the straight handle, the crank and the grip form a "U"-shaped structure with an outward-expanding opening, which can provide a larger operable space for the middle part of the femur, and is convenient for the installation and operation of the patient's total knee joint. The medical staff can also operate the grip to drive the turntable to rotate through the crank and the straight handle, so as to adjust the angles of the straight handle, the crank and the grip to free up more space above the femur, which is convenient for the surgical operation of total knee replacement.

[0021] 2. In the present invention, by setting the movable limit assembly and the limit groove, reference Figure 4As shown, when the doctor rotates the straight handle, the straight handle drives the turntable to rotate. At this time, the hemisphere at the end of the limit column overlaps with the opening of the limit slot, so that the limit column is squeezed and shrinks into the mounting hole, thereby separating the limit column from the limit slot, which facilitates the rotation of the turntable. When the movable turntable stops rotating after rotating a certain angle, the limit column is extended into another limit slot again due to the elastic force of the limit spring, thereby limiting the movable turntable, so that the movable turntable is not easily affected by the gravity of the straight handle, crank and handle and rotates during the operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0023] Figure 1 Schematic diagram of the three-dimensional structure in this embodiment;

[0024] Figure 2 This is an exploded view of the present embodiment after the handle is hidden;

[0025] Figure 3 It is a schematic diagram of the structure of the rotating disk oblique section and the movable limiter assembly in this embodiment;

[0026] Figure 4 Schematic diagram of the motion state of the movable limit assembly during the rotation of the turntable in this embodiment.

[0027] In the figure: 1. splint; 11. flexible block; 2. connecting plate; 21. notch; 22. limit groove; 3. turntable; 31. mounting hole; 4. straight handle; 5. crank; 6. grip; 7. compression spring; 8. connecting ball; 9. movable limit assembly; 91. limit column; 92. limit spring. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] Example: Reference Figure 1-3 The distraction device in total knee replacement surgery shown in the figure comprises two symmetrically arranged splints 1, and the shapes of the two splints 1 include but are not limited to circular, rectangular, etc.;

[0030] The outer sides of the two clamping plates 1 are rotatably connected to the connecting plates 2 through spherical bodies, the outer sides of the two connecting plates 2 are rotatably connected to the rotating plates 3, and the sides of the two rotating plates 3 are fixed with straight handles 4;

[0031] The ends of the two straight handles 4 away from the turntable 3 are rotatably connected to the crank 5, the ends of the two cranks 5 away from the straight handles 4 are fixed with grips 6, the ends of the two grips 6 close to the crank 5 are hinged to each other, and a compression spring 7 is fixed between the two grips 6;

[0032] The single-sided straight handle 4, the crank handle 5 and the grip 6 form a "U"-shaped structure with an opening that expands outward.

[0033] Based on the above structure, when the two splints 1 are clamped on both sides of the femur, the straight handle 4, the crank 5 and the grip 6 form a "U"-shaped structure with an outward-expanding opening, which can provide a larger operable space for the middle part of the femur, facilitating the installation and operation of the patient's total knee joint. Medical staff can also operate the grip 6 to drive the turntable 3 to rotate through the crank 5 and the straight handle 4, so as to adjust the angles of the straight handle 4, the crank 5 and the grip 6 to free up more space above the femur, thereby facilitating the surgical operation of total knee replacement.

[0034] It should be noted that the connection between the straight handle 4 and the crank 5 is realized by an adjustable connection structure commonly used in the prior art and suitable for the present embodiment, such as a hexagon socket bolt (or ordinary bolt) in combination with a nut for connection, which ensures the connection stability between the straight handle 4 and the crank 5 and facilitates further adjustment of the connection angle between the straight handle 4 and the crank 5, thereby flexibly adjusting the outward-expanded "U"-shaped structural space of the expansion device, which is more conducive to the surgeon's surgical operation of total knee replacement.

[0035] Furthermore, a groove is provided on the side of the connecting disk 2 away from the splint 1, and the turntable 3 is located in the groove. A notch 21 connected to the groove is also provided on the side of the connecting disk 2 close to the turntable 3. The notch 21 is fan-shaped, and the straight handle 4 is located between the two sides of the notch 21. By setting the notch 21, the rotation angle of the straight handle 4 is limited, thereby preventing the straight handle 4 from rotating too much and causing damage to the patient's body (surgical incision).

[0036] In order to facilitate the limiting of the rotating disk 3 after rotation, a limiting groove 22 is provided in the groove of the connecting disk 2. A plurality of limiting grooves 22 are provided and distributed along the fan-shaped inner circumference of the notch 21.

[0037] A mounting hole 31 is provided on one side of the rotating disk 3 close to the connecting disk 2. A movable limiting assembly 9 adapted to the limiting groove 22 is installed in the mounting hole 31. The movable limiting assembly 9 includes a limiting column 91 and a limiting spring 92.

[0038] The limiting column 91 is movably embedded in the mounting hole 31 and one end of the limiting column 91 extends into the limiting groove 22. The end of the limiting column 91 located in the limiting groove 22 is in a hemispherical shape.

[0039] The end of the limiting column 91 is elastically connected to the inner top wall of the mounting hole 31 through a limiting spring 92 .

[0040] By setting the movable limit assembly 9 and the limit slot 22, refer to Figure 4 As shown, when the doctor rotates the straight handle 4, the straight handle 4 drives the turntable 3 to rotate. At this time, the hemisphere at the end of the limit column 91 overlaps with the opening of the limit groove 22, so that the limit column 91 is squeezed and shrinks into the mounting hole 31, and then the limit column 91 is separated from the limit groove 22, which is convenient for the rotation of the turntable 3. When the movable turntable 3 stops rotating after rotating a certain angle (when the mounting hole 31 corresponds to another limit groove 22), the limit column 91 is extended into the other limit groove 22 again by the elastic force of the limit spring 92, thereby limiting the movable turntable 3, so that the movable turntable 3 is not easily affected by the gravity of the straight handle 4, the crank 5 and the handle 6 during the operation.

[0041] It should be further explained that the hemispherical body at the end of the limiting column 91 just stays at the opening of the limiting groove 22 (such as Figure 4 As shown), in order to ensure the limiting effect of the movable turntable 3, multiple groups of movable limiting components 9 can be installed on the movable turntable 3 to enhance the limiting effect of the movable turntable 3.

[0042] Furthermore, the spherical body is a connecting ball 8. In this embodiment, the connecting ball 8 is an elliptical sphere (such as Figure 2 As shown), during actual use, the shape of the connecting ball 8 can be flexibly set according to the rotation angle requirements of the splint 1, so that the splint 1 can be rotated to different angles. The connecting ball 8 is rollingly embedded in the side wall of the splint 1 close to the connecting disk 2, and the end point of the connecting ball 8 away from the splint 1 is fixed to the side wall of the connecting disk 2 close to the splint 1. Through the setting of the connecting ball 8, the angle between the splint 1 and the connecting disk 2 can be automatically adjusted, so that the splint 1 can better fit different parts of the patient's femur, which is convenient for the subsequent installation of the artificial total knee joint.

[0043] Furthermore, a flexible block 11 is fixed on one side of the two splints 1 that are close to each other. The flexible block 11 is made of a flexible material commonly used in the prior art and suitable for the present embodiment, has a certain elasticity and meets the requirements of surgical hygiene. Cylindrical ribs protrude from the surface of the flexible block 11. Through the setting of the flexible block 11, hard friction between the splint 1 and the patient's femur is avoided, thereby avoiding damage to the patient's knee joint femur during surgery.

[0044] Working principle of the utility model: in daily use, after cutting the damaged knee joint bone of the patient, the medical staff holds the handle 6 to open the two splints 1, and makes the two splints 1 open the muscles and blood vessels of the patient's knee and then clamp them on the femur on the patient's knee joint, so as to open the surgical incision, which is convenient for the subsequent installation of artificial total knee joint. When the two splints 1 are clamped on both sides of the femur, the straight handle 4, the crank 5 and the handle 6 form a "U"-shaped structure with an outward expansion, which can provide a large operable space for the middle part of the femur, which is convenient for the patient's During the installation operation of the total knee joint, the medical staff can also operate the handle 6 to drive the turntable 3 to rotate through the crank 5 and the straight handle 4, so as to adjust the angles of the straight handle 4, the crank 5 and the handle 6 to leave more space above the femur, which is convenient for the surgical operation of total knee replacement; when the movable turntable 3 stops rotating after rotating a certain angle, the limit column 91 is extended into another limit groove 22 again by the elastic force of the limit spring 92, thereby limiting the movable turntable 3, so that the movable turntable 3 is not easily affected by the gravity of the straight handle 4, the crank 5 and the handle 6 to rotate during the operation.

[0045] Finally, it should be noted that the above is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present utility model shall be included in the protection scope of the present utility model.

Claims

1. A distraction device for total knee replacement surgery, comprising two symmetrically arranged splints (1), characterized in that: The outer sides of the two clamping plates (1) are rotatably connected to a connecting disk (2) via a spherical body, the outer sides of the two connecting disks (2) are rotatably connected to a rotating disk (3), and the circumferences of the two rotating disks (3) are fixed with a straight handle (4); The ends of the two straight handles (4) away from the rotating disk (3) are rotatably connected to a crank (5), the ends of the two cranks (5) away from the straight handles (4) are fixed with a grip (6), the ends of the two grips (6) close to the crank (5) are hinged to each other, and a compression spring (7) is fixed between the two grips (6); The straight handle (4), the crank handle (5) and the grip (6) on one side form a "U"-shaped structure with an opening that expands outwards.

2. The distraction device for total knee replacement according to claim 1, characterized in that: A groove is formed on the side of the connection disk (2) away from the clamping plate (1), and the rotating disk (3) is located in the groove. A notch (21) connected to the groove is formed on the side of the connection disk (2) close to the rotating disk (3), and the notch (21) is fan-shaped. The straight handle (4) is located between two sides of the notch (21).

3. The distraction device for total knee replacement according to claim 2, characterized in that: A limiting groove (22) is provided in the groove of the connecting plate (2), and a plurality of the limiting grooves (22) are provided and distributed along the fan-shaped inner circumference of the notch (21); A mounting hole (31) is provided on one side of the rotating disk (3) close to the connecting disk (2), and a movable limiting component (9) adapted to the limiting groove (22) is installed in the mounting hole (31).

4. The distraction device for total knee replacement according to claim 3, characterized in that: The movable limiting assembly (9) comprises a limiting column (91) and a limiting spring (92); The limiting column (91) is movably embedded in the mounting hole (31) and one end of the limiting column (91) extends into the limiting groove (22); the end of the limiting column (91) located in the limiting groove (22) is in the shape of a hemisphere; The end of the limiting column (91) is elastically connected to the inner top wall of the mounting hole (31) via a limiting spring (92).

5. The distraction device for total knee replacement according to claim 1, characterized in that: The spherical body is a connecting ball (8), which is rollingly embedded in the side wall of the clamping plate (1) close to the connecting disk (2), and the end point of the connecting ball (8) away from the clamping plate (1) is fixed to the side wall of the connecting disk (2) close to the clamping plate (1).

6. The distraction device for total knee replacement according to claim 1, characterized in that: A flexible block (11) is fixed to each of the two clamping plates (1) on one side close to each other, and cylindrical ribs protrude from the surface of the flexible block (11).

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