Proximal femur lifting device for direct anterior approach hip replacement

Abstract

The invention discloses a proximal femur lifting device for direct anterior approach hip replacement, which belongs to the technical field of medical instruments and comprises a fixing unit, a multi-stage positioning arm, a base plate, a support column, a lifting slider, a stepping lifting mechanism and a prying and lifting support. The fixing unit is used for being installed on the operating bed side. The multi-stage positioning arm is connected with the fixing unit and the base plate and can adjust the position of the base plate; the supporting column is vertically erected on the base plate; the lifting sliding block is sleeved on the supporting column and is driven by the stepping lifting mechanism to lift; the prying and lifting support is fixed to the lifting sliding block, and a supporting clamping groove is formed in the prying and lifting support. By means of the structure, a stable force application fulcrum with the height and the angle capable of being adjusted in multiple directions is provided for the operation bone pry, the problems that in the prior art, operation is not stable, and control is difficult are solved, and safe, controllable and stable lifting of the proximal femur can be achieved.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, specifically to a proximal femoral elevation device for direct anterior approach hip replacement surgery. Background Technology

[0002] In direct anterior approach hip replacement surgery, the patient is usually positioned supine. While this position is beneficial for stabilizing the pelvis and allowing for more accurate placement of the artificial acetabulum, the proximal femur is located deep within the hip, making it difficult to safely and effectively lift and expose it during surgery. This is one of the challenges affecting the successful implementation of direct anterior approach hip replacement surgery.

[0003] Traditionally, surgeons have relied entirely on hand-held bone levers for manipulation. This method is not only unstable in terms of force application and prone to surgeon fatigue, but also suffers from drawbacks due to the lack of external support, making it difficult to control the force and direction of the lever application. These drawbacks include insufficient exposure of the proximal femur and potential damage to the tensor fasciae latae muscle. To provide support, simple supports have been attempted as external fulcrums in clinical practice, such as temporarily fixing metal rods to the side of the operating table. However, these simple supports are fixed in position and often difficult to adjust quickly during surgery. Their supporting ends often fail to form a stable and reliable connection with the bone lever, and there is a lack of convenient and effective means of adjusting the height and angle, making it impossible to quickly adjust the fulcrum to the optimal position according to the needs of the surgery. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a proximal femoral elevation device for direct anterior approach hip arthroplasty, which provides an external force fulcrum with easily adjustable spatial position for the bone lever during surgery to assist in the elevation of the proximal femur.

[0005] A proximal femoral elevation device for direct anterior approach hip arthroplasty includes a fixation unit, a multi-stage positioning arm, a base plate, a support column, a lifting slider, and a lever support. The fixation unit is detachably clamped and fixed to the side rail of the operating table. The multi-stage positioning arm includes at least two support rods connected sequentially by angle-adjustable joints, with the first end of the multi-stage positioning arm connected to the fixation unit. The base plate is fixedly connected to the end of the multi-stage positioning arm. The support column is vertically mounted on the base plate, with its lower end detachably connected to the base plate. The lifting slider has a through hole through which it is fitted onto the support column. The lifting slider is equipped with a manually driven step lifting mechanism for driving the lifting slider to move up and down along the support column. The lever support is fixedly mounted on one side of the lifting slider and has a support groove for supporting the bone lever to form an adjustable force application fulcrum.

[0006] Furthermore, horizontal insertion rods are fixed on both the upper and lower sides of the base plate. These horizontal insertion rods have an L-shaped structure, and the upper and lower horizontal insertion rods extend in opposite directions. The lower end of the support column has insertion holes that match the upper horizontal insertion rods, allowing the support column to be detachably connected to any horizontal insertion rod through these holes. This enables rapid reversal of the orientation of the support column and the prying support.

[0007] Furthermore, the stepping lifting mechanism includes toothed grooves, an operating handle, and a drive component. Multiple toothed grooves are arranged in a longitudinal array along the side of the support column. The operating handle is rotatably mounted on the lifting slider and is rotatably connected to the drive component via a rotating shaft. The drive component is located inside the lifting slider and has first and second locking teeth spaced apart. When the operating handle is rotated, the first and second locking teeth alternately engage with the toothed grooves to drive the lifting slider to move along the support column. This achieves precise step-by-step adjustment of the fulcrum height and allows for self-locking during adjustment to ensure operational safety.

[0008] Furthermore, the support slot is an arc-shaped groove. This better encloses and limits the bone pry bar body, preventing lateral slippage or torsion when force is applied.

[0009] Furthermore, the support slot is a U-shaped groove with one end open, and its open end extends to the edge of the prying support.

[0010] Furthermore, the support slot is a waist-shaped hole with closed ends, which provides a limit for the bone lever and can effectively prevent it from accidentally coming out when prying with great force.

[0011] Furthermore, the angle adjustment joint includes a clamping socket and a locking element. The end of the support rod is provided with a ball head, which is accommodated in the clamping socket. The locking element is used to lock and clamp the ball head, which can be flexibly adjusted at multiple angles and provides stable support after locking.

[0012] Furthermore, the fixing unit includes a body with a C-shaped slot for engaging with the slide bar on the side of the operating table; a threaded through hole is formed on the outer wall of the C-shaped slot, and a fastening bolt is connected to the threaded through hole. This allows it to be securely clamped onto the operating table track.

[0013] Furthermore, the multi-stage positioning arm includes three struts connected sequentially by angle-adjustable joints, allowing for flexible adaptation to different patient positions and surgical incision locations.

[0014] Furthermore, it also includes a bone pry bar, which comprises a handle and a working end with a forked structure; the working end has an arc-shaped cross-section; the section of the bone pry bar that contacts the support slot has multiple notches on both sides to form an anti-slip structure; the handle has finger holes for inserting fingers. It forms a stable fit with the support slot of the device, facilitating the application of force.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] 1. By setting up a fixed unit, multi-stage positioning arm, base plate, support column, lifting slider and pry support, the bone pryer provides a stable and reliable external force application fulcrum, improving the stability of force application.

[0017] 2. By adjusting the angle of the multi-stage positioning arm and the height of the lifting slider, the spatial position of the force application fulcrum can be conveniently and multi-directionally adjusted to meet the needs of different surgical stages, patient positions, and surgeon operating habits.

[0018] 3. The pry bar and its support slots provide a support structure for the bone pry bar and effectively prevent slippage when force is applied. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present invention.

[0020] Figure 2 yes Figure 1 A first-view structural schematic diagram of the central base plate.

[0021] Figure 3 yes Figure 1 A structural schematic diagram of the middle base plate from a second perspective.

[0022] Figure 4 yes Figure 1 Exploded view of the stepper lifting mechanism.

[0023] Figure 5 yes Figure 1 Side view of the middle stepping lifting mechanism.

[0024] Figure 6 This is a schematic diagram of the structure of Embodiment 2 of the present invention.

[0025] Figure 7 yes Figure 6 A schematic diagram of the structure of the central pry bar support.

[0026] Figure 8 This is a schematic diagram of the bone lever of the present invention.

[0027] Figure 9 This is a diagram showing the state of the device of the present invention connected to the operating table.

[0028] The diagram is labeled as follows: 1. Fixed unit; 2. Multi-stage positioning arm; 201. Support rod; 202. Angle adjustment joint; 203. Ball head; 204. Clamping socket; 205. Locking component; 3. Base plate; 4. Support column; 5. Lifting slider; 6. Stepping lifting mechanism; 601. Gear groove; 602. Operating handle; 603. Drive component; 604. First locking tooth; 605. Second locking tooth; 7. Prying support; 8. Support slot; 9. Insert rod; 10. Insertion hole; 101. C-shaped slot; 102. Fastening bolt; 11. Through hole; 14. Bone pry; 1401. Handle; 1402. Working end; 1403. Finger hole; 1404. Anti-slip structure. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0030] It should be noted that in the description of this invention, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or the number of indicated technical features. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include one or more of that feature. Furthermore, the directional terms such as "upper," "lower," "left," "right," "top," and "bottom" used in the specification and drawings are based on the directional relationships of the specific embodiments shown in the drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on the invention.

[0031] Example 1:

[0032] like Figures 1-5 As shown, the proximal femoral elevation device for direct anterior approach hip arthroplasty in this embodiment includes a fixation unit 1, a multi-stage positioning arm 2, a base plate 3, a support column 4, a lifting slider 5, a stepping lifting mechanism 6, and a prying support 7.

[0033] like Figure 9 As shown, the fixing unit 1 is used to detachably fix the entire device to the side rail of the operating table. The fixing unit 1 includes a body with a C-shaped groove 101 formed on the body for engaging with the side slide bar of the operating table; a threaded through hole is provided on the outer wall of the C-shaped groove 101, and a fastening bolt 102 is screwed into the threaded through hole. In use, the C-shaped groove 101 is engaged with the side slide bar, and the fastening bolt 102 is tightened, with its end pressing against the slide bar. The clamping force between the inner wall of the C-shaped groove 101 and the end of the bolt securely locks the device. Its function is to provide a stable installation for the device and ensure that the device will not move when a prying force is applied.

[0034] The multi-stage positioning arm 2 is connected to the fixing unit 1 and is used to adjust the front-back and left-right positions of the force application fulcrum over a wide range in the horizontal plane. It consists of at least two support rods 201 connected sequentially via angle adjustment joints 202. In this embodiment, three support rods 201 are used. The ends of the support rods 201 are provided with ball heads 203. The angle adjustment joints 202 are ball joints, including clamping sockets 204 for accommodating the ball heads 203 and locking elements 205. By loosening the locking elements 205, the included angle between each support rod 201 can be freely adjusted, thereby positioning the base plate 3 at the end in the desired horizontal position; after adjustment, tightening the locking elements 205 drives the distance between the two sides of the clamping sockets 204 to clamp and fix the ball heads 203, locking the posture of the entire multi-stage positioning arm 2. This structure allows the doctor to flexibly adjust the fulcrum to the optimal starting position on the proximal side of the femur according to the patient's body shape and incision location.

[0035] The base plate 3 is fixedly connected to the end of the multi-stage positioning arm 2 to enhance adaptability and stability. Horizontal insertion rods 9 are symmetrically fixed on the upper and lower sides of the base plate 3. The horizontal insertion rods 9 have an L-shaped structure, and their extension directions are opposite. The lower end of the support column 4 has insertion holes 10 that match the horizontal insertion rods 9. By inserting the horizontal insertion rods 9 on the upper side of the base plate 3 into the insertion holes 10 at the lower end of the support column 4, or by flipping the base plate 3 and inserting it into the lower horizontal insertion rods 9, the support column 4 and the base plate 3 can be quickly connected and their directions changed. First, when the support column 4 is connected to the upper horizontal insertion rod 9, the lower horizontal insertion rod 9 of the base plate 3 can be embedded in the soft operating table mattress, increasing friction and preventing the device from sliding. Second, the direction of the lever support 7 can be quickly adjusted, allowing the surgeon to flexibly adjust the optimal position of the force fulcrum of the bone lever 14 according to the actual surgical approach and force application habits.

[0036] The lifting slider 5 is fitted onto the support column 4 through its through hole 11 and can slide along the axial direction of the support column 4. Its main function is to connect the final force-applying component and to adjust the fulcrum height.

[0037] A stepping lifting mechanism 6 is mounted on the lifting slider 5 to drive the slider 5 to rise and fall and stably stop it at the desired height. This mechanism specifically includes multiple toothed slots 601 arranged longitudinally on the side of the support column 4; an operating handle 602 rotatably mounted on the lifting slider 5; and a drive component 603 located inside the lifting slider 5 and connected to the operating handle 602's pivot. The drive component 603 has first locking teeth 604 and second locking teeth 605 spaced apart. Reciprocatingly moving the operating handle 602 causes the drive component 603 to rotate reciprocally, causing the first locking teeth 604 and second locking teeth 605 to alternately engage with the toothed slots 601, thereby pushing the lifting slider 5 to rise and fall stepwise along the support column 4. Due to the alternating engagement of the double locking teeth, at least one locking tooth of the lifting slider 5 is engaged with the toothed slot 601 at any given time, achieving self-locking during movement, allowing the fulcrum to rise controllably, and enabling gradual lifting of the proximal femur.

[0038] The lifting support 7 is fixedly mounted on one side of the lifting slider 5 and serves as a component providing an external force fulcrum for the bone pry bar 14. It is equipped with a support groove 8 for holding the bone pry bar 14. In this embodiment, the support groove 8 is designed as a U-shaped groove with one open end, extending to the edge of the lifting support 7. This U-shaped groove is preferably an arc-shaped groove, allowing the two ends of the upper sidewall of the support groove 8 to better abut against the upper surface of the bone pry bar 14, preventing accidental lateral sliding or twisting of the bone pry bar 14 during force application, and ensuring the stability and controllability of the lifting action.

[0039] like Figure 8 As shown, the bone lever 14 has a structure of a certain width, including a handle 1401 and a working end 1402 with a forked structure. The working end 1402 can be easily inserted into the bone gap or under the bone, providing a stable point of force for levering and preventing slippage when force is applied. The cross-section of the working end 1402 is arc-shaped, which better fits the anatomical contour of the proximal femur, increases the contact area, and disperses the levering pressure. The section of the bone lever 14 that contacts the support groove 8 has multiple notches on both sides to form an anti-slip structure 1404, which is used to increase the stability of the bone lever 14 in the support groove 8 and prevent slippage when force is applied. The handle 1401 has a finger hole 1403 for inserting fingers, which makes it easy for the operator to insert fingers and hold them firmly and apply force.

[0040] Example 2:

[0041] like Figures 6-7 As shown, the main difference between this embodiment and Embodiment 1 lies in the specific shape of the support slot 8 on the prying support 7. In this embodiment, the support slot 8 is a waist-shaped hole closed at both ends. The advantage of this structure is that it provides a completely enclosed limiting environment for the bone pry 14, which can more effectively prevent the bone pry 14 from accidentally coming out of the slot when subjected to violent force, making it suitable for scenarios that require the application of a large prying force.

[0042] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A proximal femoral elevation device for direct anterior approach hip arthroplasty, characterized in that, include: The fixing unit (1) is used to detachably clamp and fix to the side rail of the operating table; A multi-stage positioning arm (2) includes at least two support rods (201) connected in sequence by angle adjustment joints (202), and the first end of the multi-stage positioning arm (2) is connected to the fixing unit (1). The base plate (3) is fixedly connected to the end of the multi-stage positioning arm (2); A support column (4) is vertically mounted on a base plate (3), and the lower end of the support column (4) is detachably connected to the base plate (3). The lifting slider (5) has a through hole (11). The lifting slider (5) is fitted onto the support column (4) through the through hole (11). The lifting slider (5) is provided with a manually driven step lifting mechanism (6) for driving the lifting slider (5) to rise and fall along the support column (4). The pry support (7) is fixedly installed on one side of the lifting slider (5). The pry support (7) is provided with a support slot (8) for supporting the bone pry, so as to form an adjustable force application fulcrum.

2. The proximal femoral elevation device according to claim 1, characterized in that, The base plate (3) is fixed with horizontal rods (9) on both the upper and lower sides. The horizontal rods (9) are L-shaped and extend in opposite directions on the upper and lower sides. The lower end of the support column (4) is provided with a socket (10) that matches the upper horizontal rod (9). The support column (4) can be detachably connected to any horizontal rod (9) through the socket (10).

3. The proximal femoral elevation device according to claim 1, characterized in that, The stepping lifting mechanism (6) includes a toothed groove (601), an operating handle (602), and a driving member (603). The toothed groove (601) is provided in multiple ways and is arranged in a longitudinal array along the side of the support column (4). The operating handle (602) is rotatably mounted on the lifting slider (5). The operating handle (602) is rotatably connected to the driving member (603) through a rotating shaft. The driving member (603) is located inside the lifting slider (5). The driving member (603) is provided with a first locking tooth (604) and a second locking tooth (605) at intervals. When the operating handle (602) is rotated, the first locking tooth (604) and the second locking tooth (605) can alternately mesh with the toothed groove (601) to drive the lifting slider (5) to move along the support column (4).

4. The proximal femoral elevation device according to claim 1, characterized in that, The support slot (8) is an arc-shaped slot.

5. The proximal femoral elevation device according to claim 1, characterized in that, The support slot (8) is a U-shaped slot with one end open, and its open end extends to the edge of the prying support (7).

6. The proximal femoral elevation device according to claim 1, characterized in that, The support slot (8) is a waist-shaped hole closed at both ends.

7. The proximal femoral elevation device according to claim 1, characterized in that, The angle adjustment joint (202) includes a clamping socket (204) and a locking member (205). The end of the support rod (201) is provided with a ball head (203). The ball head (203) is housed in the clamping socket (204). The locking member (205) is used to lock and clamp the ball head (203).

8. The proximal femoral elevation device according to claim 1, characterized in that, The fixing unit (1) includes a body, which is provided with a C-shaped slot (101) for inserting a sliding rod on the side of the operating table; a threaded through hole is provided on the outer wall of the C-shaped slot (101), and a fastening bolt (102) is connected to the threaded through hole.

9. The proximal femoral elevation device according to claim 1, characterized in that, The multi-stage positioning arm (2) includes three support rods (201) connected sequentially by the angle adjustment joint (202).

10. The proximal femoral elevation device according to any one of claims 1 to 9, characterized in that, It also includes a bone pry bar (14), which includes a handle (1401) and a working end (1402) with a fork-shaped structure; the working end (1402) has an arc-shaped cross section; the section of the bone pry bar (14) that contacts the support slot (8) has multiple notches on both sides to form an anti-slip structure (1404); the handle (1401) has a finger hole (1403) for inserting a finger.

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