Bone nail implantation depth measurer
By designing a bone screw implantation depth measuring device and utilizing the cooperation of a scale and fixation components, the problem of measuring the implantation depth of non-metallic bone screws has been solved, achieving surgical precision and safety, and protecting the health of patients and doctors.
Patent Information
- Application Number
- CN202423122435.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-17
- Publication Date
- 2026-02-10
- Estimated Expiration
- 2034-12-17
AI Technical Summary
Existing depth measuring devices cannot measure the implantation depth of non-metallic bone screws in real time during the implantation process, resulting in insufficient surgical precision and the inability to avoid problems of implantation that is too deep or too shallow.
A bone screw implantation depth measuring device was designed, comprising a scale, a bracket, and a fixation component. By aligning and fixing the scale with the length of the bone screw in real time, and using the fixation component to ensure the relative position of the scale and the bracket, the bone screw implantation depth can be measured in real time.
It enables precise measurement of the non-metallic bone screw implantation depth, ensuring surgical stability, avoiding implantation that is too deep or too shallow, protecting the health of patients and doctors, and reducing X-ray radiation exposure.
Smart Images
Figure CN223886974U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of medical devices, specifically relating to a bone screw implantation depth measuring device. Background Technology
[0002] Bone screws, also known as fracture fixation screws, are orthopedic implants commonly used to fix fractures or dislocations, helping bones restore their continuity and function. They can be screwed directly into two different bone fragments or fixation plates to fix and position the bone in a fracture, promoting healing. Bone screws have a wide range of applications, including fracture fixation in major areas such as the shoulder, elbow, hip, knee, and spine.
[0003] In current trauma orthopedic clinical practice, before implanting bone screws, holes are drilled in the bone. The screws are then screwed or hammered into the pre-drilled holes, and fixation is achieved using screws or other tools to ensure stability. In some surgeries, bone screws need to be implanted at specific depths or locations, requiring real-time measurement of the implantation depth to prevent insufficient or excessive implantation that could penetrate tissue or skin. X-ray irradiation is an important auxiliary method in bone screw implantation surgery, helping surgeons accurately locate the screws and ensure surgical precision. However, this method is only suitable for implanting metallic bone screws. For non-metallic bone screws, which are not visible under X-ray irradiation, their implantation depth cannot be tracked during the procedure.
[0004] Currently available depth measuring devices are used to measure the depth of the bone tunnel before implantation to select a bone screw of appropriate length. They cannot measure the implantation depth of the bone screw during the implantation process, and therefore cannot meet the needs of some special surgeries that require measuring the implantation depth of bone screws. Utility Model Content
[0005] This invention provides a bone screw implantation depth measuring device, which can measure the bone screw implantation depth in real time during the bone screw implantation process to ensure the smooth progress of the surgery.
[0006] To solve the above-mentioned technical problems, the technical solution provided by this utility model is as follows:
[0007] Furthermore, it includes a scale, a bracket, and a fixing component. One end of the bracket is detachably connected to the nail holder, and the other end of the bracket is slidably connected to the scale. The scale is arranged parallel to the nail holder, and the fixing component is arranged to lock and unlock the relative position of the scale and the bracket.
[0008] Furthermore, the fixing component includes a fixing clip, which is fixedly connected to the bracket and used to hold the scale.
[0009] Furthermore, the scale is elongated, with multiple slots on one side along its length. A sleeve is provided at the end of the bracket, and the scale is slidably fitted inside the sleeve along its length. The fixing component is configured to match within the slots to fix the relative position of the scale and the bracket.
[0010] Furthermore, the sleeve side surface is provided with a mounting hole, which communicates with the inside of the sleeve; the fixing component includes a positioning bead, which is fixed in the mounting hole, and the front end of the positioning bead has a ball bead, which matches in the slot.
[0011] Furthermore, the sleeve side surface is provided with a mounting hole, which communicates with the inside of the sleeve; the fixing component includes a positioning bead, which is fixed in the mounting hole, and the front end of the positioning bead has a ball bead, which matches in the slot.
[0012] Furthermore, the outer wall of the positioning bead has an external thread, the inner wall of the mounting hole has an internal thread, and the external thread matches the internal thread.
[0013] Furthermore, the fixing component includes a sliding sleeve, a spring, a through hole, and a ball bearing. The sliding sleeve is fitted onto the outer wall of the sleeve, the through hole is located in the middle of the inner wall of the sleeve, the ball bearing is located in the gap between the sleeve and the sliding sleeve and is accommodated in the through hole, one end of the spring is fixedly connected to the sleeve and the other end is fixedly connected to the inside of the sliding sleeve, the ball bearing matches the groove, the inner wall of the sliding sleeve is provided with a shallow groove along the length direction, and the scale is configured such that when the shallow groove is opposite to the position of the ball bearing, the scale can slide relative to the sleeve.
[0014] Furthermore, a positioning block is provided on the inner wall of the sleeve, and the positioning block and the ball are respectively located on both sides of the scale.
[0015] Furthermore, the diameter of the through hole is smaller than the diameter of the ball.
[0016] Furthermore, a baffle is provided on the outer wall of the sleeve, and an annular groove is provided on the inner wall of one end of the sliding sleeve. The groove has an annular bottom surface perpendicular to the inner wall of the sliding sleeve. The spring is accommodated in the groove, with one end fixedly connected to the baffle and the other end fixedly connected to the bottom surface.
[0017] Furthermore, when the spring is in a relaxed state, the ball is configured to protrude to its maximum height from the through hole toward the inside of the sleeve under the squeezing action of the inner wall of the sliding sleeve, so as to match the slot; when the spring is compressed, the ball is configured to contact the shallow groove, so that the height of the ball protruding toward the inside of the sleeve is reduced, so that the scale slides in the sleeve.
[0018] The beneficial effects of this invention are as follows: This invention provides a bone screw implantation depth measuring device. By adjusting the scale to be the same length as the bone screw, the implantation depth can be directly detected through the scale reading during the implantation process, ensuring that the bone screw is implanted to the predetermined depth and avoiding damage to surrounding tissues or secondary injury. This structure is simple and convenient to operate for measuring depth. This invention provides two structures for adjusting and fixing the scale to ensure both flexibility of adjustment and firmness of fixation, thus guaranteeing the stability of the surgery. The design of this invention can be used for bone screw implantation surgeries of various materials, eliminating the need to consider the X-ray radiolucency of the bone screw, helping doctors to make precise positioning, and protecting the health of both patients and doctors by reducing radiation exposure. Attached Figure Description
[0019] Figure 1 This is a structural diagram of the bone screw implantation depth measuring device of this utility model during use;
[0020] Figure 2 This is a side view of the scale ruler of this utility model (with the slot surface);
[0021] Figure 3 This is a structural diagram of the other side of the ruler of this utility model (with scale surface).
[0022] Figure 4 This is a cross-sectional view of the bone screw implantation depth measuring device according to the first embodiment of this utility model;
[0023] Figure 5 This is an enlarged view of the structure of the fixing component in the first embodiment of the present invention;
[0024] Figure 6 This is a cross-sectional view of the bone screw implantation depth measuring device according to the second embodiment of this utility model (without springs).
[0025] Figure 7 This is a cross-sectional view of the bone screw implantation depth measuring device according to the second embodiment of this utility model;
[0026] Figure 8 This is a side view of the bracket according to the second embodiment of the present invention.
[0027] The reference numerals in the figures include:
[0028] 100—Bracket 110—Sleeve 120—Fixing Claw
[0029] 200—Nail holder; 300—Scale; 310—Slot
[0030] 320—graduation; 400—bone screw; 510—positioning bead
[0031] 511—Ball ball; 520—Sliding sleeve; 530—Spring
[0032] 540—Ball bearing; 521—Shallow groove; 523—Groove
[0033] 522—Bottom surface 111—Mounting hole 112—Baffle
[0034] 113—Location Block Detailed Implementation
[0035] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model 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 of the present utility model and are not intended to limit the present utility model.
[0036] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.
[0037] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model 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 this utility model.
[0038] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.
[0039] like Figure 1The diagram shows the structure of a bone screw implantation depth measuring device according to a first embodiment of this utility model. It mainly includes a bracket 100, a scale 300, and a fixing component (not labeled in the figure). One end of the bracket 100 is provided with a fixing claw 120 for detachable connection with the screw holder 200, and the other end is provided with a sleeve 110. The central axis of the sleeve 110 is parallel to the central axis of the fixed screw holder 200. The sleeve 110 has a hollow interior to accommodate the scale 300. Figure 2 and Figure 3 As shown, the scale 300 is a long strip structure with two large side surfaces. Multiple slots 310 are arranged closely along the length of one side, forming an arc shape. The other side of the scale 300 has graduations 320, which begin marking from the end of the scale 300. The scale 300 is slidably fitted into the sleeve 110 along its length and can be fixed in place by fitting it into the corresponding slots 310 using a fixing component. In actual operation, after the nail holder 200 is fixed with the fixing claw 120, the clamping part of the nail holder 200 and the bone nail 400 is coplanar with the end of the sleeve 110. When the scale 300 is adjusted so that the length of the extension of the sleeve 110 is the same as the length of the bone nail 400, the scale 300 is fixed by the fixing component. During the implantation process, the implantation depth of the bone nail 400 can be measured in real time by observing the scale 320 of the scale 300 corresponding to the bone nail 400.
[0040] Preferably, the radius of each arc-shaped slot 310 is 0.8~1.2mm, and the center distance between adjacent slots 310 is 0.5~1.5mm. The smaller size design can ensure the accuracy of measurement.
[0041] like Figure 4 and Figure 5 As shown, the bone screw 400 implantation depth measuring device of the first embodiment of this utility model has a mounting hole 111 on the side surface of the sleeve 110, which communicates with the hollow interior of the sleeve 110. The fixing component is a positioning bead 510, which is disposed in the mounting hole 111. The front end of the positioning bead 510 has a ball bead 511, which can be matched in the slot 310 to achieve positioning. The outer wall of the positioning bead 510 has external threads, and the inner wall of the mounting hole 111 has internal threads. The internal and external threads match to fix the positioning bead 510 in the mounting hole 111. Threadlocker can also be added to strengthen the fixation.
[0042] In this embodiment, the cross-sectional area of the hollow structure of the sleeve 110 is slightly larger than that of the scale 300, allowing the scale 300 to slide along its length within the sleeve 110. When no external force is applied, the positioning bead 510 can be positioned within the slot 310 by matching the ball bead 511. Under greater external force, the scale 300 can slide to adjust its extension from the sleeve 110 to match the length of the bone screw 400. Then, during implantation, the implantation depth can be read by measuring the scale 320 on the scale 300 at the junction of the implanted and unimplanted portions of the bone screw 400.
[0043] like Figure 6-8 The diagram shows the structure of the bone screw implantation depth measuring device according to the second embodiment of this utility model. The fixing component includes a sliding sleeve 520, a spring 530, a through hole, and a ball bearing 540. The sliding sleeve 520 is sleeved on the outer wall of the sleeve 110. A baffle 112 is provided on the outer wall of the sleeve 110. An annular groove 523 is provided on the inner wall of one end of the sliding sleeve 520. The groove 523 has an annular bottom surface 522 that is perpendicular to the inner wall of the sliding sleeve 520. The spring 530 is accommodated in the groove 523, with one end fixedly connected to the baffle 112 and the other end fixedly connected to the bottom surface 522. Therefore, the sliding sleeve 520 can slide back and forth relative to the sleeve 110 under the action of external force.
[0044] like Figure 6 As shown, a through hole is located in the middle of the sleeve 110. The ball bearing 540 is located in the gap between the sleeve 110 and the sliding sleeve 520, and a portion of it is accommodated in the through hole. The diameter of the ball bearing 540 is larger than the diameter of the through hole, so that the ball bearing 540 can only move radially within the through hole, and only a portion of it can enter the hollow structure of the sleeve 110, but cannot completely enter the hollow structure of the sleeve 110 from the through hole, thus preventing the ball bearing 540 from coming out. A shallow groove 521 is provided along the length direction in the middle of the inner wall of the sliding sleeve 520. When the spring 530 is in a relaxed state, the ball 540 protrudes to its maximum height from the through hole toward the inside of the sleeve 110 under the squeezing action of the inner wall of the sliding sleeve 520, so as to match the groove 310 to fix the scale 300. When the spring 530 is compressed, the sliding sleeve 520 slides relative to the sleeve 110, so that the shallow groove 521 is aligned with the ball 540, and the height of the ball 540 protruding toward the inside of the sleeve 110 is reduced, so that the scale 300 can slide inside the sleeve 110.
[0045] like Figure 6 As shown, a positioning block 113 is provided on the inner wall of the sleeve 110. The positioning block 113 and the ball bearing 540 are located on both sides of the scale 300, respectively, to hold the scale 300 and prevent it from rotating inside the sleeve 110.
[0046] In the actual operation of this embodiment, in the initial state, the spring 530 is in a relaxed state, the ball 540 protrudes to the maximum height towards the inside of the sleeve 110 and matches the corresponding slot 310, and the scale 300 is fixed under the clamping of the ball 540 and the positioning block 113; push the sliding sleeve 520 to make it slide relative to the sleeve 110, so that the shallow groove 521 is opposite to the ball 540, and the height of the ball 540 protruding towards the inside of the sleeve 110 decreases, so that the scale 300 can slide in the sleeve 110. Manually adjust the length of the scale 300 extending out of the sleeve 110 to be consistent with the length of the bone nail 400, release the sliding sleeve 520, so that it returns to the initial state under the action of the spring 530, the ball 540 matches into the corresponding slot 310, and the scale 300 is fixed.
[0047] This utility model provides a bone screw implantation depth measuring device according to a third embodiment. Its general structure is basically the same as the first two embodiments. The difference is that the fixing component in this embodiment is a fixing clip, which is fixedly connected to the bracket 100 and used to hold and fix the scale 300. The fixing clip can be an alligator clip, spring clip, pliers clip or other types of clips, while the scale 300 can be any shape that is convenient for clamping and fixing.
[0048] The above content is only a preferred embodiment of this utility model. For those skilled in the art, many changes can be made in the specific implementation and application scope based on the concept of this utility model. As long as these changes do not depart from the concept of this utility model, they all fall within the protection scope of this utility model.
Claims
1. A bone screw implantation depth measuring device, characterized in that, The device includes a scale (300), a bracket (100), and a fixing component. One end of the bracket (100) is detachably connected to a nail holder (200), and the other end of the bracket (100) is slidably connected to the scale (300). The scale (300) is arranged parallel to the nail holder (200). The fixing component is arranged to lock and unlock the relative position of the scale (300) and the bracket (100).
2. The bone screw implantation depth measuring device according to claim 1, characterized in that, The fixing component includes a fixing clip, which is fixedly connected to the bracket (100) and used to hold the scale (300).
3. The bone screw implantation depth measuring device according to claim 1, characterized in that, The ruler (300) has multiple slots (310) along its length on one side, and a sleeve (110) is provided at the end of the bracket (100). The ruler (300) is slidably fitted into the sleeve (110) along its length. The fixing component is configured to match the slots (310) to fix the relative position of the ruler (300) and the bracket (100).
4. The bone screw implantation depth measuring device according to claim 3, characterized in that, The sleeve (110) has a mounting hole (111) on its side surface, which communicates with the inside of the sleeve (110); the fixing component includes a positioning bead (510) which is fixed in the mounting hole (111), and the front end of the positioning bead (510) has a ball bead (511) which matches in the slot (310).
5. The bone screw implantation depth measuring device according to claim 4, characterized in that, The outer wall of the positioning bead (510) has an external thread, and the inner wall of the mounting hole (111) has an internal thread, with the external thread matching the internal thread.
6. The bone screw implantation depth measuring device according to claim 3, characterized in that, The fixing assembly includes a sliding sleeve (520), a spring (530), a through hole, and a ball (540). The sliding sleeve (520) is sleeved on the outer wall of the sleeve (110). The through hole is located in the middle of the inner wall of the sleeve (110). The ball (540) is located in the gap between the sleeve (110) and the sliding sleeve (520) and is accommodated in the through hole. One end of the spring (530) is fixedly connected to the sleeve (110), and the other end is fixedly connected to the inside of the sliding sleeve (520). The ball (540) matches the slot (310). A shallow groove (521) is provided on the inner wall of the sliding sleeve (520) along the length direction. The scale (300) is configured to slide relative to the sleeve (110) when the shallow groove (521) and the ball (540) are positioned opposite each other.
7. The bone screw implantation depth measuring device according to claim 6, characterized in that, The inner wall of the sleeve (110) is provided with a positioning block (113), and the positioning block (113) and the ball (540) are respectively located on both sides of the scale (300).
8. The bone screw implantation depth measuring device according to claim 7, characterized in that, The diameter of the through hole is smaller than the diameter of the ball (540).
9. The bone screw implantation depth measuring device according to claim 8, characterized in that, The outer wall of the sleeve (110) is provided with a baffle (112), and the inner wall of one end of the sliding sleeve (520) is provided with an annular groove (523). The groove (523) has an annular bottom surface (522) perpendicular to the inner wall of the sliding sleeve (520). The spring (530) is accommodated in the groove (523), with one end fixedly connected to the baffle (112) and the other end fixedly connected to the bottom surface (522).
10. The bone screw implantation depth measuring device according to claim 7, characterized in that, When the spring (530) is in a relaxed state, the ball (540) is configured to protrude to the maximum height from the through hole toward the inside of the sleeve (110) under the squeezing action of the inner wall of the sliding sleeve (520) to match the groove (310); when the spring (530) is compressed, the ball (540) is configured to contact the shallow groove (521), so that the height of the ball (540) protruding toward the inside of the sleeve (110) decreases, so that the scale (300) slides in the sleeve (110).