Acetabulum angular distance ruler
By designing the acetabular angular scale, the problem of uncertainty in the acetabular cup placement angle during hip replacement is solved, and a fast and accurate preoperative planning method is provided, reducing the difficulty of the operation and improving the success rate.
Patent Information
- Application Number
- CN202420705025.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-08
- Publication Date
- 2024-12-27
- Estimated Expiration
- 2034-04-08
AI Technical Summary
In hip arthroplasty, there is uncertainty in the placement angle of the acetabular cup, which may be dislocated in the first replacement or special cases, and a rapid and accurate preoperative planning method is lacking to reduce the difficulty of the surgery.
An acetabular angle scale is designed, including a horizontal handrail, abduction distance measuring plate, positioning rod, central axis vertical rod, angle indicator bow plate and forward inclination pointer, which is read through locking devices and scales to assist medical care. The personnel accurately calculate and adjust the abduction angle and forward angle of the acetabular cup.
This equipment can quickly and accurately assist medical staff in planning the acetabular cup placement angle, reduce the difficulty of surgery, improve the success rate of surgery, and reduce the pain of patients.
Smart Images
Figure CN222237666U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of medical instruments, in particular to an acetabulum angle distance ruler. Background Art
[0002] Hip replacement is a surgical procedure for serious joint diseases, mainly used to treat femoral head necrosis, femoral neck subcapital fracture, congenital hip dysplasia and other serious hip diseases. When part of the hip joint structure cannot meet its functional requirements due to disease or injury, part or all of the femoral head and acetabulum need to be replaced with artificial joint components to restore the normal function of the joint.
[0003] Hip replacement consists of four main parts: acetabular cup, liner, femoral head and femoral stem. During the operation, the doctor will first saw off the worn femoral head, then grind it on one side of the acetabulum, then implant a metal acetabular cup and place a polyethylene or ceramic liner inside the acetabular cup. Next, implant a femoral stem on one side of the femoral medullary cavity and install the femoral head (metal or ceramic), which forms a complete artificial hip joint.
[0004] In traditional hip replacement surgery, the focus is on the angle of placement of the acetabular cup (depending on the surgeon's experience or surgical robot) and the angle of placement of the femoral stem. The placement of the femoral stem is 15 degrees anteversion, and the femoral moment has little adjustability due to its special physiological properties. Therefore, the most important thing is the placement of the acetabular cup, and the placement of the acetabular cup has two angles: abduction angle and anteversion angle. It varies from person to person. During the operation, the patient's fatness, acetabular hyperplasia and degree of defect, pelvic anterior and posterior tilt, spinal compensation and other factors, the size of the acetabular cup, the surgeon's position, visual distance, and angle factors, there is a certain degree of uncertainty in the placement of the acetabular cup. For first-time replacement or special cases, if the acetabular cup is not placed in the "safe zone", dislocation will occur. Although the acetabular fault tolerance rate is high, there are still some dislocation phenomena. The market lacks a method to quickly and accurately complete the preoperative planning of the acetabular cup placement angles of abduction and anteversion to reduce the difficulty of surgery. Utility Model Content
[0005] The utility model provides an acetabular angle distance ruler, which can quickly and accurately complete the two angles of the abduction angle and the anteversion angle of the acetabular cup placed in the preoperative plan.
[0006] The technical scheme of the utility model is: an acetabulum angle distance ruler, comprising a horizontal hand frame, an abduction distance measuring plate, a positioning rod, a vertical rod bracket, a central axis vertical rod, an angle indicating arch plate, an inclination pointer, and a locking device. The top of the horizontal hand frame is provided with an angle indicating arch plate, the bottom of the angle indicating arch plate is provided with a vertical rod bracket, the center of the vertical rod bracket is rotatably connected with an inclination pointer, the inclination pointer is provided with a locking device, the inclination pointer is locked with the angle indicating arch plate by the locking device, and the scale is read, the center back of the vertical rod bracket is rotatably connected with the central axis vertical rod, scales are provided on both sides of the horizontal hand frame, a through hole is provided in the middle of the horizontal hand frame, the abduction distance measuring plate slides in the through hole, locking devices are provided at both ends of the abduction distance measuring plate, the abduction distance measuring plate is locked with the horizontal hand frame by the locking device, and the scale is read, and the center of the abduction distance measuring plate is detachably connected with a positioning rod.
[0007] Preferably, the central axis pole is divided into two sections, the front section is rotatably connected to the pole bracket, and the rear section is rotatably connected to the front section, a limit stop is provided at the connection, and the end of the rear section is bent and has a trumpet-shaped groove.
[0008] Preferably, the center of the central axis upright is aligned with the scale zero points on both sides of the horizontal hand support.
[0009] Preferably, a trumpet-shaped groove is provided at the end of the positioning rod.
[0010] Preferably, an angle conversion table is engraved on the handle portion of the horizontal hand support.
[0011] Preferably, the horizontal hand rest, the abduction distance measuring plate, the angle indicating arch plate, and the forward inclination pointer are made of medical stainless steel.
[0012] Preferably, the locking device is composed of a slider, a button, and a spring. The abduction distance measuring plate and the fore-inclination pointer are provided with a slide rail, the slider moves in the slide rail, a spring is provided between the slider and the inner wall of the slide rail, and a button is connected to the top of the slider.
[0013] Preferably, the central axis pole and the forward inclination pointer are hollowed out in the middle.
[0014] The principle of the utility model is as follows: before use, the patient is positioned, the operating table is adjusted in the side-lying position so that the line connecting the left and right anterior superior iliac spines is perpendicular to the ground, the horizontal hand frame is held by hand, the trunk is used as the longitudinal axis, perpendicular to the ground, and the central axis upright pole is used as the rotation center. When installing the acetabular cup, after determining the size of the acetabular cup, the required abduction angle is calculated, the conversion table is checked to determine the moving distance of the abduction distance measuring plate, and then the abduction angle distance measuring plate is adjusted to the required position, and then the anteversion pointer is adjusted to the required angle position point, the bottom of the central axis upright pole is clamped in the lower edge of the acetabular cup, and the aiming is adjusted from the central positioning hole of the abduction angle distance measuring plate while striking, and the striking is adjusted to the visible upper edge of the acetabular cup, and at the same time, the acetabular cup driving rod is aligned and adjusted from the hollowed-out part of the anteversion pointer until it is adjusted in place and struck in place, and then the positioning rod is clamped in the upper edge of the acetabular cup for confirmation, and the central axis upright pole is used as a reference for the front and back, up and down adjustment of the acetabular cup driving rod, and the abduction angle and anteversion angle of acetabular cups of different sizes are accurately installed with the angle designed before the operation as a guide.
[0015] The beneficial effects of the utility model are as follows: an acetabular angle distance ruler has a scientific and reasonable structural design, is simple and easy to use, and has low difficulty in getting started. It can assist medical staff to quickly and accurately complete the abduction angle and anteversion angle of the acetabular cup placed in preoperative planning, effectively reducing the difficulty of surgery, improving the success rate of surgery, and alleviating the pain of patients. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 It is a schematic diagram of the structure of the utility model;
[0017] Figure 2 for Figure 1 A partial enlarged view of the middle part;
[0018] Figure 3 for Figure 1 A partial enlarged view of part B in the middle;
[0019] Figure 4 It is a schematic diagram of the structure of the utility model;
[0020] Figure 5 This is the front view of the utility model;
[0021] Figure 6 It is the right view of the utility model;
[0022] Figure 7 This is a reference diagram of the use status of the utility model;
[0023] Figure 8 This is a reference diagram of the use status of the utility model;
[0024] In the figure, 101-horizontal hand frame, 102-extension distance measuring plate, 103-positioning rod, 104-pole bracket, 105-central axis pole, 106-angle indicating bow plate, 107-forward inclination pointer, 200-locking device, 201-slider, 202-button, 203-spring. DETAILED DESCRIPTION
[0025] The specific implementation of the utility model is as follows: Figure 1-Figure 6 As shown, an acetabulum angle distance ruler includes a horizontal hand frame 101, an abduction distance measuring plate 102, a positioning rod 103, a vertical rod support 104, a central axis vertical rod 105, an angle indicating arch plate 106, an anteversion pointer 107, and a locking device 200. The horizontal hand frame 101 has an angle indicating arch plate 106 on the top, and a vertical rod support 104 is provided below the angle indicating arch plate 106. The vertical rod support 104 is centrally connected to an anteversion pointer 107, and a locking device 200 is provided on the anteversion pointer 107. The locking device 200 is used to lock the anteversion pointer 107. 07 is locked with the angle indicating bow plate 106, and the scale is read. The back side of the center of the upright bracket 104 is rotatably connected with the central axis upright pole 105 in the vertical direction. There are scales on both sides of the horizontal hand frame 101. There is a through hole in the middle of the horizontal hand frame 101. The abduction distance measuring plate 102 slides in the through hole. There are locking devices 200 at both ends of the abduction distance measuring plate 102. The abduction distance measuring plate 102 is locked with the horizontal hand frame 101 by the locking device 200, and the scale is read. The center of the abduction distance measuring plate 102 is detachably connected with a positioning rod 103.
[0026] Example of use: Reference Figure 7-Figure 8 For example, if the diameter of the acetabular cup is L=40 mm, and the preoperatively planned abduction angle is a=25°, read the conversion table in Table 1, and the moving distance of the abduction distance measuring plate 102 is b=16.9047 mm. When in use, unlock the locking device 200, move the abduction distance measuring plate 102 to a suitable distance, loosen the locking device 200, clamp the central axis stand 105 on the lower edge of the acetabular cup, and hit the acetabular cup driving rod until the upper edge of the acetabular cup can be seen in the vertical direction of the through hole of the abduction distance measuring plate 102, and then adjust the acetabular cup driving rod to align with the preoperatively planned anteversion angle c and anteversion pointer 107.
[0027] Table 1
[0028]
[0029] Specifically, Figure 4As shown, the central axis rod 105 is divided into two sections, the front section is rotatably connected to the rod bracket 104, and the rear section is rotatably connected to the front section, and there is a limit stopper at the connection point, and the end of the rear section is bent and has a trumpet-shaped groove. The trumpet-shaped groove facilitates the central axis rod 105 to be clamped on the lower edge of the acetabular cup to prevent the central axis rod 105 from shifting during use, which affects the quality of surgery.
[0030] Specifically, Figure 5 As shown, the center of the central axis stand 105 is aligned with the scale zero points on both sides of the horizontal hand frame 101. The central axis stand 105 is used as a reference for adjusting the acetabular cup driving rod forward and backward and up and down, which helps to improve the surgical accuracy.
[0031] Specifically, a trumpet-shaped groove is provided at the end of the positioning rod 103. The trumpet-shaped groove facilitates the positioning rod 103 to be clamped on the upper edge of the acetabular cup, thereby preventing the positioning rod 103 from shifting during use, thereby affecting the quality of the operation.
[0032] Specifically, an angle conversion table is engraved on the handle portion of the horizontal hand frame 101. The angle conversion table facilitates medical staff to obtain various data and reduces the difficulty of use.
[0033] Specifically, the horizontal hand support 101, the abduction distance measuring plate 102, the angle indicating arch plate 106, and the forward inclination pointer 107 are made of medical stainless steel. The horizontal hand support 101, the abduction distance measuring plate 102, the angle indicating arch plate 106, and the forward inclination pointer 107 made of medical stainless steel are not easy to rust, have a long service life, and can be reused after disinfection.
[0034] Specifically, Figure 2 , Figure 3 As shown, the locking device 200 is composed of a slider 201, a button 202, and a spring 203. The abduction distance measuring plate 102 and the inclination pointer 107 have a slide rail, the slider 201 moves in the slide rail, a spring 203 is arranged between the slider 201 and the inner wall of the slide rail, and the top of the slider 201 is connected with a button 202. In the above technical solution, when the medical staff operates, they only need to press the button 202 and press the spring 203 to adjust the relevant parameters. After adjusting to the appropriate parameters, release the button 202, the spring 203 presses the slider 201, and the abduction distance measuring plate 102 and the inclination pointer 107 no longer move.
[0035] Specifically, Figure 4 As shown, the central axis stand 105 and the anteversion pointer 107 are hollowed out in the middle. Through the hollowed out central axis stand 105 and the anteversion pointer 107, medical staff can quickly observe the acetabular cup driving rod position, thereby improving the usability of the acetabular angle distance ruler.
[0036] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection of the utility model is defined by the attached claims and their equivalents.
Claims
1. An acetabular angle distance ruler, characterized in that: The invention comprises a horizontal hand frame (101), an abduction distance measuring plate (102), a positioning rod (103), a vertical pole bracket (104), a central axis vertical pole (105), an angle indicating arch plate (106), a forward inclination pointer (107), and a locking device (200). The horizontal hand frame (101) has an angle indicating arch plate (106) at the top, the vertical pole bracket (104) is disposed below the angle indicating arch plate (106), the vertical pole bracket (104) is centrally connected to a forward inclination pointer (107), and the forward inclination pointer (107) is provided with a locking device (200). The forward inclination pointer (107) is locked by the locking device (200). 7) is locked with the angle indicating bow plate (106) and the scale is read. The back side of the center of the upright support (104) is rotatably connected with the central axis upright support (105) in the vertical direction. The horizontal hand frame (101) has scales on both sides. The middle of the horizontal hand frame (101) has a through hole. The abduction distance measuring plate (102) slides in the through hole. The two ends of the abduction distance measuring plate (102) are provided with locking devices (200). The abduction distance measuring plate (102) and the horizontal hand frame (101) are locked by the locking devices (200) and the scale is read. The center of the abduction distance measuring plate (102) is detachably connected with a positioning rod (103).
2. The acetabular angle ruler according to claim 1, characterized in that: The central axis pole (105) is divided into two sections, the front section is rotatably connected to the pole bracket (104), and the rear section is rotatably connected to the front section. A limit stop is provided at the connection point, and the rear section has a bent end and a trumpet-shaped groove.
3. The acetabular angle ruler according to claim 2, characterized in that: The center of the central axis upright rod (105) is aligned with the scale zero points on both sides of the horizontal hand frame (101).
4. The acetabular angle ruler according to claim 1, characterized in that: The end of the positioning rod (103) is provided with a trumpet-shaped groove.
5. The acetabular angle ruler according to claim 1, characterized in that: An angle conversion table is engraved on the handle portion of the horizontal hand frame (101).
6. The acetabular distance ruler according to claim 1, characterized in that: The horizontal hand support (101), the abduction distance measuring plate (102), the angle indicating arch plate (106), and the forward inclination pointer (107) are made of medical stainless steel material.
7. The acetabular angle ruler according to claim 1, characterized in that: The locking device (200) is composed of a slider (201), a button (202), and a spring (203); a slide rail is provided in the abduction distance measuring plate (102) and the forward inclination pointer (107); the slider (201) moves in the slide rail; a spring (203) is provided between the slider (201) and the inner wall of the slide rail; and the top of the slider (201) is connected to the button (202).
8. The acetabular angle ruler according to claim 1, characterized in that: The central axis upright pole (105) and the forward inclination pointer (107) are hollowed out in the middle.