A deviation detection mechanism for a hip joint replacement femoral stem

Abstract

This invention discloses a femoral stem deviation detection mechanism for hip replacement, relating to the field of femoral stem deviation detection technology. It includes a detection frame and a femoral stem body placed inside the detection frame for dimensional deviation detection. Adaptor mechanisms are provided on both the upper and lower sides of the detection frame, and each adapter mechanism includes an adapter slider. A detection mechanism is located inside the detection frame, including a laser emitter and a laser receiver. A positioning mechanism is located below the detection frame, including a main positioning bracket and a secondary positioning bracket. This femoral stem deviation detection mechanism for hip replacement uses the main and secondary positioning brackets on the front and rear sides of the detection frame to position the femoral stem body. The adapter mechanisms move and adjust the light-shielding baffle, laser emitter, and laser receiver, and after cleaning the femoral stem body, they fit against its outer wall for deviation detection.

Description

Technical Field

[0001] This invention relates to the field of femoral stem deviation detection technology, specifically a deviation detection mechanism for femoral stem in hip replacement surgery. Background Technology

[0002] The femoral stem in hip replacement surgery is the core load-bearing component of an artificial hip joint. It is primarily used to replace the diseased or damaged upper femur. Inserted into the femoral medullary cavity during hip replacement surgery, it provides stable support for the artificial femoral head. The femoral stem is typically a slender rod, with its upper end connected to the artificial femoral head and its lower end inserted into the femoral medullary cavity. Its surface may have a microporous coating (such as titanium alloy or porous tantalum) or a hydroxyapatite coating to promote bone ingrowth and achieve biological fixation. Surgically implanted into the body, it aims to permanently replace the diseased upper femur and bear the body's load. The required femoral stem size varies depending on the patient's age, necessitating precise testing for dimensional deviations after molding and processing.

[0003] Application CN210464372U discloses a femoral stem fixation device. The connecting part is movably disposed above the base, and its top is provided with a connector for connecting to the mounting hole at the top of the femoral stem. The connector is vertically arranged with the measuring platform of the imaging measuring instrument, which can fix different models of femoral stems on the measuring platform of the imaging measuring instrument and keep the femoral stem upright on the measuring platform. After the femoral stem is upright, it is convenient to measure the size by imaging measurement and will not produce large measurement errors.

[0004] Application CN222724892U discloses a femoral stem detection device. The processing module adopts an embedded computer system and has a built-in dedicated algorithm. Based on the data information fed back after preliminary processing by the data acquisition module, it can quickly calculate the curvature of the femoral stem and compare and analyze the calculated curvature value with the standard curvature value, thereby accurately determining whether the femoral stem can make the artificial hip joint prosthesis form a good match with the patient's femoral anatomy.

[0005] However, the aforementioned dimensional deviation detection mechanism for femoral stem processing still has the following problems: it detects dimensional deviations of the femoral stem by laser scanning, but such deviation detection mechanism does not come into contact with the femoral stem during use, which makes it difficult to accurately identify the dimensional deviations by laser scanning. At the same time, the femoral stem is positioned and clamped on the side during the detection process, which affects the accuracy of the femoral stem in dimensional deviation detection.

[0006] Therefore, we propose a deviation detection mechanism for the femoral stem in hip replacement surgery to address the aforementioned problems. Summary of the Invention

[0007] The purpose of this invention is to provide a deviation detection mechanism for the femoral stem in hip replacement surgery. This addresses the problem that existing methods use laser scanning to detect dimensional deviations in the femoral stem, but these mechanisms do not contact the femoral stem during use, making it difficult to accurately identify dimensional deviations during laser scanning. Additionally, the femoral stem is held in place on its side during the detection process, which affects the accuracy of dimensional deviation detection.

[0008] To achieve the above objectives, the present invention provides the following technical solution: a deviation detection mechanism for the femoral stem in hip replacement, comprising a detection frame and a femoral stem body placed inside the detection frame for detecting dimensional deviations; The detection frame is equipped with an adapter mechanism on both the upper and lower sides, and the adapter mechanism includes an adapter slider, and an adapter slide is fixedly installed on the inner side of the adapter slider. The internal structure of the testing frame contains a testing mechanism, which includes a laser emitter and a laser receiver. The laser emitter and laser receiver are arranged in an integrated structure with vertical symmetry on the left and right sides of the femoral stem body. The integrated structure of the laser emitter and laser receiver detects the deviation of different curvatures at the edge of the same femoral stem body by sliding. A positioning mechanism is provided below the testing frame, and the positioning mechanism includes a main positioning bracket and a secondary positioning bracket, which position the end of the femoral stem body.

[0009] Preferably, the adapter mechanism includes a transverse slide bar and a longitudinal slide bar, both of which are slidably installed on the upper and lower sides inside the testing frame. The transverse slide bar and the longitudinal slide bar form a staggered "+" shaped structure, which is used to adapt to the testing of femoral stem bodies of different specifications.

[0010] Preferably, the adapter mechanism includes a transverse slide bar and a longitudinal slide bar that are slidably disposed on the upper and lower sides inside the adapter slider. The adapter slider drives the transverse slide bar to slide back and forth inside the detection frame along the distribution direction of the longitudinal slide bar, and the adapter slider drives the longitudinal slide bar to slide left and right inside the detection frame along the distribution of the transverse slide bar.

[0011] Preferably, the adapter mechanism includes a guide threaded rod rotatably disposed on the upper left and right sides inside the testing frame, and the guide threaded rod is slidably disposed through the end of the upper transverse slide rod inside the testing frame. The outer wall of the lower transverse slide rod inside the testing frame is provided with a guide threaded groove, and the lower transverse slide rod is threadedly connected to the adapter slider through the guide threaded groove. The adapter mechanism includes an adapter elastic frame that is fixedly installed on the left and right sides of the outer end of the upper and lower adapter sliders. The outer end of the adapter elastic frame is attached to the left and right sides of the testing frame. The adapter elastic frame is used to synchronize the movement of the upper and lower adapter sliders to adapt to the testing operation of femoral stem bodies of different specifications.

[0012] Preferably, the detection mechanism includes a light-shielding baffle, which is disposed on the left and right sides inside the detection frame. The end bearing of the light-shielding baffle is rotatably mounted with a positioning shaft, and the positioning shaft is slidably mounted inside the adapter slide plate. The positioning shaft and the adapter slide plate are connected to each other by a reset spring, and the light-shielding baffles are close to each other in the initial state.

[0013] Preferably, the detection mechanism includes a positioning brush rod, which is disposed on the front and rear sides of the inner end of the light-shielding baffle. The laser emitter and the integrated laser receiver included in the detection mechanism are slidably mounted on the upper and lower ends of the left and right light-shielding baffles by a drive cylinder.

[0014] Preferably, the inner side of the positioning brush rod included in the detection mechanism is attached to and slides against the outer wall of the femoral stem body, and the irregular shape of the outer wall of the femoral stem body causes the positioning brush rod and the light-shielding baffle to rotate at different angles during the movement, and the inner wall of the positioning brush rod and the laser emitted by the laser emitter are distributed at the same horizontal level.

[0015] Preferably, the lower end of the sub-positioning bracket included in the positioning mechanism is fixedly installed at the rear center position of the detection frame, and an extension sleeve is slidably provided through the front of the bottom end of the sub-positioning bracket. The extension sleeve and the sub-positioning bracket are connected to each other by a contact spring, and the front end of the extension sleeve is fixedly connected to the lower end of the main positioning bracket.

[0016] Preferably, the positioning mechanism includes a main positioning bracket that is slidably mounted at the center of the front of the testing frame, and the upper ends of the main positioning bracket and the secondary positioning bracket both extend into the interior of the testing frame. The main positioning bracket and the secondary positioning bracket abut against the ends of femoral stem bodies of different specifications through the inner positioning liner, which is used for positioning during dimensional deviation detection.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: This deviation detection mechanism for the femoral stem in hip replacement uses the main positioning bracket and the secondary positioning bracket on the front and rear sides inside the detection frame to position the femoral stem body. The adapter mechanism moves and adjusts the light-shielding baffle, laser emitter, and laser receiver, and performs deviation detection by fitting them against the outer wall after cleaning the femoral stem body. The specific details are as follows: 1. Slide the main positioning bracket at the front of the inside of the testing frame forward. This will cause the extension sleeve fixed at the bottom to stretch the contact spring, thereby increasing the distance between it and the secondary positioning bracket. Then, place the femoral stem body in a front-to-back position between the light-shielding baffles on the left and right sides inside the testing frame. Make the end of the femoral stem body contact the main positioning bracket and the secondary positioning bracket respectively. This will cause the main positioning bracket to move back to its original position through the reverse contraction of the contact spring, so that the inner anti-slip liner can position the femoral stem body.

[0018] 2. The adapter slider and adapter slide move the detection mechanism to adapt to the femoral stem body of different specifications and processing shapes for detection. The guide thread rod drives the upper longitudinal slide rod and the adapter slider that runs through the middle to move in the front and back directions; the lower transverse slide rod drives the adapter slider to slide in the front and back directions through the guide thread groove, so that the adapter slider and adapter slide drive the inner detection mechanism to move in the left and right and front and back directions.

[0019] Furthermore, the adapter elastic frame drives the adapter slider below to move, so that the adapter sliders on the upper and lower sides can move and adjust synchronously, thereby ensuring that the laser emitters and laser receivers distributed on the upper and lower sides are always in a vertical position to receive and position the emitted laser.

[0020] 3. The light-shielding baffles are located on the left and right sides of the femoral stem body. The longitudinal slide rod with guide thread grooves rotates, which drives the adapter slider and adapter slide plate to move in the front and back direction. This causes the positioning brush rod to move against the outer wall of the femoral stem body, which helps to clean the powder and dust on the outside of the femoral stem body before the laser detection operation, thereby avoiding affecting the deviation detection of the femoral stem body.

[0021] 4. The positioning brush rod is pressed against the outer arc of the femoral stem body. After it fits the outer wall of the femoral stem body, it drives the light-shielding baffle to rotate at the inner end of the positioning shaft, thereby adjusting the fit to avoid affecting the accuracy of the test due to changes in the curvature of the side of the femoral stem body.

[0022] Furthermore, the laser emitter emits a detection laser downwards, and the laser receiver receives the laser. The emitted laser is positioned at the center of the light-shielding baffle and is in contact with the side of the femoral stem body. This is to block the laser when there are dimensional deviations such as bulges or deformations on the side of the femoral stem body, so that the laser receiver cannot receive the laser for alarm and detection.

[0023] The laser emitter and receiver, which are integrated into one structure, move towards the side of the femoral stem body. When the laser reaches the side without being blocked, the movement path is calculated. The length of the movement path is compared with the standard value of the center of the arc of the femoral stem body at that position to determine the offset data of that position. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the present invention; Figure 2 This is a schematic diagram of the structure adapted for skateboard mounting in this invention; Figure 3 This is a schematic diagram of the installation structure of the guide thread rod of the present invention; Figure 4 For the present invention Figure 3 Enlarged structural diagram at point A in the middle; Figure 5 This is a schematic diagram of the three-dimensional structure of the slider adapted to this invention; Figure 6 This is a schematic diagram of the three-dimensional structure of the light-shielding baffle of the present invention; Figure 7 For the present invention Figure 6 Enlarged structural diagram at point B; Figure 8 This is a three-dimensional structural diagram of the light-shielding baffle and positioning shaft of the present invention; Figure 9 For the present invention Figure 8 Enlarged structural diagram at point C; Figure 10 This is a schematic diagram of the main positioning bracket and the secondary positioning bracket of the present invention for positioning the femoral stem body; Figure 11 This is a schematic diagram of the femoral stem body measurement structure of the present invention; Figure 12 For the present invention Figure 11 Enlarged structural diagram at point D.

[0025] In the diagram: 1. Detection frame; 2. Femoral stem body; 3. Adaptor slider; 4. Adaptor slide plate; 5. Laser emitter; 6. Laser receiver; 7. Main positioning bracket; 8. Secondary positioning bracket; 9. Transverse slide bar; 10. Longitudinal slide bar; 11. Guide threaded rod; 12. Guide threaded groove; 13. Light-shielding baffle; 14. Positioning pivot; 15. Return spring; 16. Positioning brush rod; 17. Adaptor elastic frame; 18. Extension sleeve; 19. Contact spring. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] Please see Figures 1-12 The present invention provides the following technical solution: Example 1: In order to solve the problems existing in the deviation detection of the femoral stem body 2, this example discloses the following technical solution: a deviation detection mechanism for the femoral stem of hip replacement, including a detection frame 1 and a femoral stem body 2 placed inside the detection frame 1 for dimensional deviation detection; a positioning mechanism is provided below the detection frame 1, and the positioning mechanism includes a main positioning bracket 7 and a secondary positioning bracket 8, and the main positioning bracket 7 and the secondary positioning bracket 8 are positioned for the end of the femoral stem body 2.

[0028] The positioning mechanism includes a secondary positioning bracket 8 whose lower end is fixedly installed at the rear center of the testing frame 1. An extension sleeve 18 is slidably provided through the front of the bottom end of the secondary positioning bracket 8. The extension sleeve 18 and the secondary positioning bracket 8 are connected to each other by a contact spring 19. The front end of the extension sleeve 18 is fixedly connected to the lower end of the main positioning bracket 7. The positioning mechanism includes a main positioning bracket 7 which is slidably installed at the center of the front of the testing frame 1. The upper ends of the main positioning bracket 7 and the secondary positioning bracket 8 both extend into the interior of the testing frame 1. The main positioning bracket 7 and the secondary positioning bracket 8 abut against the ends of femoral stem bodies 2 of different specifications through the inner positioning liner, which is used for positioning during dimensional deviation detection.

[0029] like Figure 1 , Figure 10 As shown, when it is necessary to detect dimensional deviations of femoral stem bodies 2 of different specifications, the femoral stem body 2 is first placed longitudinally and inserted into the interior of the testing frame 1 from front to back. Then, the main positioning bracket 7 in the center of the front of the testing frame 1 is manually slid outward. The main positioning bracket 7 drives the extension sleeve 18 and the contact spring 19 fixed at the bottom to slide forward, so that the femoral stem body 2 passes through the pointed part at the rear end between the light-shielding baffles 13 on the left and right sides. Then, the rear end of the femoral stem body 2 is placed against the upper inner side of the secondary positioning bracket 8. At the same time, the main positioning bracket 7 and the extension sleeve 18 slide backward through the contraction of the contact spring 19, thereby driving the main positioning bracket 7 to abut against the front end of the femoral stem body 2, so that the main positioning bracket 7 and the secondary positioning bracket 8 can position the femoral stem body 2 and avoid misalignment during subsequent dimensional deviation detection, which would affect the accuracy of the data.

[0030] Example 2: To solve the problems existing in the deviation detection of the femoral stem body 2, this example discloses the following technical solution: the upper and lower sides of the inside of the detection frame 1 are provided with an adapter mechanism, and the adapter mechanism includes an adapter slider 3, and an adapter slide plate 4 is fixedly installed on the inner side of the adapter slider 3; the adapter mechanism includes a transverse slide rod 9 and a longitudinal slide rod 10, and the transverse slide rod 9 and the longitudinal slide rod 10 are slidably installed on the upper and lower sides inside the detection frame 1, and the transverse slide rod 9 and the longitudinal slide rod 10 form a cross-shaped structure with vertical misalignment, and the transverse slide rod 9 and the longitudinal slide rod 10 are used to adapt to the detection of femoral stem bodies 2 of different specifications.

[0031] The adapter mechanism includes a transverse slide bar 9 and a longitudinal slide bar 10 that are slidably disposed on the upper and lower sides inside the adapter slider 3. The adapter slider 3 drives the transverse slide bar 9 to slide back and forth inside the inspection frame 1 along the distribution direction of the longitudinal slide bar 10, and the adapter slider 3 drives the longitudinal slide bar 10 to slide left and right inside the inspection frame 1 along the distribution of the transverse slide bar 9. The adapter mechanism includes guide threaded rods 11 that are rotatably disposed on the upper left and right sides inside the inspection frame 1, and the guide threaded rods 11 are slidably disposed inside the upper left and right sides of the inspection frame 1. The end of the transverse slide bar 9 and the outer wall of the transverse slide bar 9 inside the inner side of the testing frame 1 are provided with guide thread grooves 12, and the lower transverse slide bar 9 is threadedly connected to the adapter slider 3 through the guide thread grooves 12; the adapter mechanism includes adapter elastic frames 17 fixedly installed on the left and right sides of the outer ends of the upper and lower adapter sliders 3, and the outer ends of the adapter elastic frames 17 are attached to the left and right sides of the testing frame 1. The adapter elastic frames 17 are used to synchronize the movement of the upper and lower adapter sliders 3 to adapt to the testing operation of femoral stem bodies 2 of different specifications.

[0032] like Figures 3-5 As shown, the adapter mechanism includes an adapter slider 3 and an adapter slide plate 4, which drive the detection mechanism to move in the left-right and front-back directions. This is used to adapt to and detect femoral stem bodies 2 of different specifications and processing shapes. The motor at the top of the detection frame 1 drives the guide thread rods 11 connected to the left and right sides by the pulley assembly to rotate. The transverse slide rod 9, which is threaded to the guide thread rod 11, is positioned by the detection frame 1 so that the upper longitudinal slide rod 10 drives the adapter slider 3, which passes through the middle, to move in the front-back direction. The lower transverse slide rod 9 is driven to rotate by the motor, which drives the adapter slider 3, which is connected to the outer wall by the guide thread groove 12, to slide in the front-back direction. This allows the adapter slider 3 and the adapter slide plate 4 to drive the inner detection mechanism to move in the left-right and front-back directions.

[0033] The upper adapter slider 3 moves the lower adapter slider 3 through the left and right adapter elastic frames 17, so that the upper and lower adapter sliders 3 can move and adjust synchronously, and the laser emitter 5 and laser receiver 6 distributed on the upper and lower sides can always be in a vertical state to receive and position the emitted laser.

[0034] Example 3: To address the existing problems in deviation detection of the femoral stem body 2, this example discloses the following technical solution: A detection mechanism is provided inside the detection frame 1, and the detection mechanism includes a laser emitter 5 and a laser receiver 6. The laser emitter 5 and the laser receiver 6 are arranged in an integrated structure with vertical symmetry on the left and right sides of the femoral stem body 2. The integrated structure of the laser emitter 5 and the laser receiver 6 detects deviations of different curvatures at the same edge of the femoral stem body 2 by sliding. The detection mechanism includes a light-shielding baffle 13, which is arranged on the left and right sides inside the detection frame 1. The end bearing of the light-shielding baffle 13 is rotatably mounted with a positioning shaft 14, and the positioning shaft 14 is slidably mounted inside the adapter slide plate 4. The positioning shaft 14 and the adapter slide plate 4 are connected to each other by a return spring 15. In the initial state, the light-shielding baffles 13 are close to each other.

[0035] The detection mechanism includes a positioning brush rod 16, which is located on the front and rear sides of the inner end of the light-shielding baffle 13. The laser emitter 5 and the integrated laser receiver 6 included in the detection mechanism are slidably mounted on the upper and lower ends of the left and right light-shielding baffles 13 via a drive cylinder. The inner side of the positioning brush rod 16 is attached to and slides against the outer wall of the femoral stem body 2. The irregular shape of the outer wall of the femoral stem body 2 causes the positioning brush rod 16 and the light-shielding baffle 13 to rotate at different angles during the movement. The inner wall of the positioning brush rod 16 and the laser emitted by the laser emitter 5 are distributed at the same horizontal level.

[0036] like Figures 6-9 As shown, after the femoral stem bodies 2 of different specifications are positioned by the positioning mechanism under the detection frame 1, the light-shielding baffles 13 included in the detection mechanism are located on the left and right sides of the femoral stem bodies 2. When performing specification deviation detection, the longitudinal slide rod 10 with the guide thread groove 12 below rotates to drive the adapter sliders 3 and adapter slide plates 4 on the upper and lower sides to move in the front and back direction. The light-shielding baffles 13 installed above the adapter slide plates 4 drive the positioning brush rod 16 to move against the outer wall of the femoral stem body 2, which helps to clean the powder and dust on the outside of the femoral stem body 2 before the laser detection operation, thereby avoiding affecting the deviation detection of the femoral stem body 2.

[0037] Furthermore, the positioning brush rod 16 on the inner side of the light-shielding baffle 13 is always in contact with the outer wall of the femoral stem body 2. When the light-shielding baffle 13 moves back and forth, the outer arc of the femoral stem body 2 abuts against the positioning brush rod 16. After the positioning brush rod 16 is in contact with the outer wall of the femoral stem body 2, it drives the light-shielding baffle 13 to rotate at the inner end of the positioning shaft 14, thereby adjusting the fit to avoid affecting the accuracy of the detection due to changes in the arc of the side of the femoral stem body 2.

[0038] Furthermore, the laser emitter 5, installed on the upper inner side of the light-shielding baffle 13, emits a detection laser downwards, while the laser receiver 6, located on the lower inner side of the light-shielding baffle 13, receives the emitted laser. The laser emitter 5 and the laser receiver 6 move and rotate with the light-shielding baffle 13. The emitted laser is positioned at the center of the light-shielding baffle 13 and is in contact with the side of the femoral stem body 2. This allows the laser to be blocked when there are dimensional deviations such as protrusions or deformations on the side of the femoral stem body 2, thus preventing the laser receiver 6 from receiving the laser for alarm and detection.

[0039] like Figure 11 As shown, during laser detection of the same femoral stem body 2, the curvature of its side varies depending on replacement requirements. When the light-shielding baffle 13 moves the integrated laser emitter 5 and laser receiver 6 to the side of the femoral stem body 2 with a larger curvature, the positioning brush rod 16 inside the light-shielding baffle 13 adheres to the side of the femoral stem body 2. However, when there are different curvatures, the laser emitted by the laser emitter 5 and laser receiver 6 cannot adhere to the side of the femoral stem body 2 (e.g., Figure 12 As shown), at this time, the integrated laser emitter 5 and laser receiver 6 are pushed by the cylinder structure in the light shield 13, so that the laser emitter 5 and laser receiver 6 will move the emitted laser closer to the side of the femoral stem body 2. When the laser reaches the side without being blocked, the laser movement path is calculated and the length of the movement path is compared with the standard value of the center of the arc of the femoral stem body 2 at that position to determine the offset data of that position.

[0040] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A deviation detection mechanism for the femoral stem in hip replacement, comprising a detection frame (1) and a femoral stem body (2) placed inside the detection frame (1) for detecting dimensional deviations. Its features are, Also includes: The detection frame (1) is provided with an adapter mechanism on both the upper and lower sides inside, and the adapter mechanism includes an adapter slider (3), and an adapter slide plate (4) is fixedly installed on the inner side of the adapter slider (3). The detection frame (1) is equipped with a detection mechanism, which includes a laser emitter (5) and a laser receiver (6). The laser emitter (5) and the laser receiver (6) are arranged in an integrated structure with vertical symmetry on the left and right sides of the femoral stem body (2). The integrated structure of the laser emitter (5) and the laser receiver (6) detects the deviation of different curvatures at the edge of the same femoral stem body (2) by sliding. A positioning mechanism is provided below the detection frame (1), and the positioning mechanism includes a main positioning bracket (7) and a secondary positioning bracket (8), and the main positioning bracket (7) and the secondary positioning bracket (8) are positioned at the end of the femoral stem body (2).

2. The deviation detection mechanism for the femoral stem in hip replacement surgery according to claim 1, characterized in that: The adapter mechanism includes a transverse slide bar (9) and a longitudinal slide bar (10), and both the transverse slide bar (9) and the longitudinal slide bar (10) are slidably installed on the upper and lower sides inside the testing frame (1). The transverse slide bar (9) and the longitudinal slide bar (10) form a cross-shaped structure with the upper and lower parts staggered. The transverse slide bar (9) and the longitudinal slide bar (10) are adapted to the testing of femoral stem bodies (2) of different specifications.

3. The deviation detection mechanism for the femoral stem in hip replacement surgery according to claim 2, characterized in that: The adapter mechanism includes a transverse slide bar (9) and a longitudinal slide bar (10) which are slidably disposed on the upper and lower sides inside the adapter slider (3). The adapter slider (3) drives the transverse slide bar (9) to slide back and forth inside the detection frame (1) along the distribution direction of the longitudinal slide bar (10), and the adapter slider (3) drives the longitudinal slide bar (10) to slide left and right inside the detection frame (1) along the distribution of the transverse slide bar (9).

4. The deviation detection mechanism for the femoral stem in hip replacement surgery according to claim 3, characterized in that: The adapter mechanism includes a guide thread rod (11) rotatably mounted on the upper left and right sides inside the testing frame (1), and the guide thread rod (11) slides through the end of the upper transverse slide rod (9) inside the testing frame (1). The outer wall of the lower transverse slide rod (9) inside the testing frame (1) is provided with a guide thread groove (12), and the lower transverse slide rod (9) is threadedly connected to the adapter slider (3) through the guide thread groove (12). The adapter mechanism includes an adapter elastic frame (17) fixedly installed on the left and right sides of the outer end of the upper and lower adapter sliders (3), and the outer end of the adapter elastic frame (17) is attached to the left and right sides of the testing frame (1). The adapter elastic frame (17) is used to synchronize the movement of the upper and lower adapter sliders (3) to adapt to the testing operation of femoral stem bodies (2) of different specifications.

5. The deviation detection mechanism for the femoral stem in hip replacement surgery according to claim 1, characterized in that: The detection mechanism includes a light-shielding baffle (13), which is located on the left and right sides inside the detection frame (1). The end bearing of the light-shielding baffle (13) is rotatably mounted with a positioning shaft (14), which is slidably mounted inside the adapter slide plate (4). The positioning shaft (14) and the adapter slide plate (4) are connected to each other by a reset spring (15). In the initial state, the light-shielding baffles (13) are close to each other.

6. The deviation detection mechanism for the femoral stem in hip replacement surgery according to claim 5, characterized in that: The detection mechanism includes a positioning brush rod (16), which is located on the front and rear sides of the inner end of the light-shielding baffle (13). The laser emitter (5) and the integrated laser receiver (6) included in the detection mechanism are slidably installed on the upper and lower ends of the left and right light-shielding baffles (13) by a drive cylinder.

7. The deviation detection mechanism for the femoral stem in hip replacement surgery according to claim 6, characterized in that: The inner side of the positioning brush rod (16) included in the detection mechanism is attached to and slides against the outer wall of the femoral stem body (2). The irregular shape of the outer wall of the femoral stem body (2) causes the positioning brush rod (16) and the light shield (13) to rotate at different angles during the movement. The inner wall of the positioning brush rod (16) and the laser emitted by the laser emitter (5) are distributed at the same horizontal level.

8. The deviation detection mechanism for the femoral stem in hip replacement surgery according to claim 1, characterized in that: The lower end of the sub-positioning bracket (8) included in the positioning mechanism is fixedly installed at the rear center position of the detection frame (1), and an extension sleeve (18) is slidably provided at the front of the bottom end of the sub-positioning bracket (8). The extension sleeve (18) and the sub-positioning bracket (8) are connected to each other by a contact spring (19), and the front end of the extension sleeve (18) is fixedly connected to the lower end of the main positioning bracket (7).

9. A deviation detection mechanism for the femoral stem in hip replacement surgery according to claim 8, characterized in that: The positioning mechanism includes a main positioning bracket (7) which is slidably installed at the center of the front of the testing frame (1). The upper ends of the main positioning bracket (7) and the upper ends of the auxiliary positioning bracket (8) extend into the interior of the testing frame (1). The main positioning bracket (7) and the auxiliary positioning bracket (8) abut against the ends of the femoral stem bodies (2) of different specifications through the inner positioning liner, which is used for positioning during dimensional deviation detection.

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