Mini square bone harvesting device for autologous bone grafting of ankle cartilage injury

Abstract

The utility model belongs to the technical field of medical apparatus and instruments, disclose a kind of for ankle joint cartilage injury autogenous bone transplantation's miniature square bone taking device.The for ankle joint cartilage injury autogenous bone transplantation's miniature square bone taking device including sleeve type cutter, handle component and moving part, the sleeve type cutter inside has polygonal cavity, the first end of sleeve type cutter is provided with the beveling of blade edge portion, the second end of sleeve type cutter is provided with adapter part;The handle component is along first direction extension setting, one end of handle component is connected with the adapter part;The moving part is slidably arranged in the polygonal cavity and can be moved along first direction, and the moving part is used to push out the bone bolt in the polygonal cavity.The utility model is used to intercept polygonal bone bolt, not only improve filling rate after transplantation, and the position between bone bolt can be limited by shape characteristics.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to a miniature square bone harvesting device for autologous bone transplantation of ankle cartilage damage. Background Technology

[0002] Bone grafting is a surgical procedure that transplants bone tissue into a patient's body to strengthen or fuse bone defects. It is commonly used for bone defects, nonunion fractures, filling cavities after curettage of bone diseases or tumors, and spinal and joint fusion. Autologous bone grafting, a clinically common procedure, has advantages such as good tissue compatibility, no transplant rejection, and strong osteoinduction, resulting in excellent bone fusion promotion.

[0003] Currently, the core step in autologous osteochondral grafting for treating ankle cartilage damage involves harvesting one or more cylindrical bone plugs from the patient's own non-weight-bearing area of ​​the ankle joint (such as the distal tibia) and then transplanting them to the damaged area. This procedure typically uses a hollow cylindrical bone harvesting instrument (ring drill).

[0004] However, this traditional cylindrical bone harvester has the following inherent drawbacks: Geometric mismatch: When the harvested circular bone plugs are placed in the damaged area of ​​the ankle joint, gaps remain between multiple plugs, forming a "Swiss cheese"-like structure. This reduces the load-bearing area and mechanical stability of the transplantation site, affecting long-term efficacy. Low filling rate: Even with tightly packed circular bone plugs, a 100% filling rate cannot be achieved; theoretically, the maximum filling rate is only 90.7%. Positioning and rotation issues: Circular bone plugs are about-center symmetrical, and their position cannot be determined by their shape after transplantation, potentially affecting biomechanical properties. Utility Model Content

[0005] The purpose of this invention is to provide a miniature square bone harvesting device for autologous bone transplantation in ankle cartilage injury, which is used to cut polygonal bone plugs. After transplantation, it not only improves the filling rate, but also defines the position between bone plugs through shape features.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] A miniature square bone harvesting device for autologous bone grafting in ankle cartilage damage includes:

[0008] A sleeve-type cutter has a polygonal cavity inside, a first end of the sleeve-type cutter is provided with a beveled cutting section with a cutting edge, and a second end of the sleeve-type cutter is provided with a connecting section.

[0009] A handle component, which extends along a first direction and one end of the handle component is connected to the adapter portion;

[0010] A movable component is slidably disposed within the polygonal cavity and capable of moving along the first direction; the movable component is used to push out the bone plug within the polygonal cavity.

[0011] As an alternative to a miniature square bone harvesting device for autologous bone transplantation in ankle cartilage damage, the handle has a sliding cavity, the sidewall of which has a strip-shaped hole extending along the first direction. One end of the movable member passes through the handle and is slidably disposed within the sliding cavity. The movable member has a pin hole. The miniature square bone harvesting device for autologous bone transplantation in ankle cartilage damage further includes:

[0012] A pin is provided, one end of which is inserted into the pin hole, and the other end of which passes through the strip hole and extends out of the handle.

[0013] As an alternative to a miniature square bone harvesting device for autologous bone transplantation in ankle cartilage damage, the outer wall of the handle is provided with depth scale indicators along the extension direction of the strip hole.

[0014] As an alternative to a miniature square bone harvesting device for autologous bone transplantation in ankle cartilage damage, the movable part is provided with a planar pushing part at one end of the polygonal cavity, and a limiting step part is provided inside the polygonal cavity, with the planar pushing part stopping at the limiting step part.

[0015] As an alternative to a miniature square bone harvesting device for autologous bone transplantation in ankle cartilage damage, the handle is provided with a first guide hole, the movable part is provided with a second guide hole, and the guide Kirschner wire can be sequentially inserted into the first guide hole, the sliding cavity and the second guide hole.

[0016] As an alternative to a miniature square bone harvesting device for autologous bone transplantation in ankle cartilage damage, the sleeve-type cutter is made of stainless steel.

[0017] As an alternative to a miniature square bone harvesting device for autologous bone transplantation in ankle cartilage damage, the adapter is provided with an internal thread interface, one end of the handle is provided with an external thread, and the handle is threadedly connected to the sleeve-type cutter.

[0018] As an alternative to a miniature square bone harvesting device for autologous bone transplantation in ankle cartilage damage, the adapter is provided with an insertion interface, one end of the handle is provided with an insertion part, and the handle is inserted into the sleeve-type cutter.

[0019] As an alternative to a miniature square bone harvesting device for autologous bone transplantation in ankle cartilage damage, the outer wall of the handle is provided with an anti-slip structure.

[0020] As an alternative to a miniature square bone harvesting device for autologous bone transplantation in ankle cartilage damage, the anti-slip structure includes anti-slip protrusions, anti-slip grooves, or anti-slip patterns.

[0021] The beneficial effects of this utility model are:

[0022] This invention provides a miniature square bone harvesting device for autologous bone grafting in ankle cartilage damage. The second end of a sleeve-type cutter has an adapter, and a handle extending along a first direction connects to the adapter. This not only facilitates holding and striking the handle but also prevents direct striking force from acting on the sleeve-type cutter. The first end of the sleeve-type cutter has a beveled cutting section with a blade. The sleeve-type cutter has a polygonal cavity inside, allowing it to cut polygonal bone plugs in the harvesting area under striking force. After cutting, pushing the movable part pushes out the polygonal bone plugs located in the polygonal cavity, facilitating their rapid detachment from the device and simplifying the bone grafting procedure, thus shortening the operation time. During the bone grafting procedure, the polygonal bone plugs can make face-to-face contact, improving the filling rate. Furthermore, the shape of the polygonal bone plugs limits their position, preventing misalignment and promoting wound healing. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of this utility model and these drawings without creative effort.

[0024] Figure 1 This is an assembly diagram of a miniature square bone harvesting device for autologous bone transplantation of ankle cartilage damage in an embodiment of this utility model.

[0025] Figure 2 This is a first exploded view of a miniature square bone harvesting device for autologous bone transplantation of ankle cartilage damage in an embodiment of this utility model.

[0026] Figure 3 This is a second exploded view of the miniature square bone harvesting device for autologous bone transplantation of ankle cartilage damage in an embodiment of this utility model.

[0027] Figure 4 This is a cross-sectional view of a miniature square bone harvesting device for autologous bone transplantation of ankle cartilage damage in an embodiment of this utility model.

[0028] Figure label:

[0029] 1. Sleeve-type cutter; 2. Handle component; 3. Moving component; 4. Pin component; 41. Clearance through hole;

[0030] 11. Polygonal cavity; 111. Limiting step section; 12. Beveled section; 121. Blade section; 13. Adapter section;

[0031] 21. Sliding cavity; 22. Strip-shaped hole; 23. First guide through hole; 24. Depth scale indicator line;

[0032] 31. Pin hole; 32. Planar push part; 33. Second guide through hole. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0034] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium; or the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0035] In the description of this utility model, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0036] The embodiments of this utility model are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar parts or parts having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0037] Bone grafting, as an important orthopedic treatment, is based on the principle of precisely transplanting specially treated bone tissue into areas of the patient's body with bone defects, requiring enhanced support, or promoting bone fusion through meticulous surgical procedures. This technique has a wide range of applications in orthopedic clinical practice, commonly used to address bone defects, handle complex cases of nonunion fractures, fill cavities created after the removal of bone diseases or tumors, and achieve effective fusion of the spine and joints.

[0038] Among various bone grafting methods, autologous bone grafting, commonly used in clinical practice, is highly favored due to its unique advantages. Autologous bone originates from the patient's own body, thus possessing excellent tissue compatibility. This means that the transplanted bone tissue can perfectly integrate with the patient's own skeleton, without triggering a rejection reaction. Simultaneously, autologous bone also has a strong osteoinductive effect, stimulating surrounding tissues to produce new bone cells, thereby significantly enhancing the bone fusion effect and providing strong support for the patient's bone recovery.

[0039] Specifically, in the subfield of treating ankle cartilage damage, autologous osteochondral grafting has become an effective treatment method. In the core step of this procedure, the surgeon carefully removes one or more cylindrical bone plugs from a non-weight-bearing area of ​​the patient's own ankle (such as the distal tibia) using specialized medical instruments. These bone plugs, after careful processing, are accurately transplanted to the damaged area of ​​the ankle joint to fill the cartilage defect and promote the recovery of joint function. To achieve this goal, surgeons typically use a hollow cylindrical bone harvester, which is widely used in clinical practice due to its peculiar shape.

[0040] However, while this traditional cylindrical bone harvester meets surgical needs to some extent, it has some inherent drawbacks that cannot be ignored. First, the geometric mismatch is particularly prominent. Because the harvested bone boluses are circular, when these circular boluses are placed into the damaged area of ​​the ankle joint, gaps that cannot be filled are often left between multiple boluses. The presence of these gaps creates a "Swiss cheese"-like structure in the transplant area, which not only significantly reduces the weight-bearing area of ​​the transplant area but also severely affects its mechanical stability, thus adversely impacting long-term efficacy.

[0041] Secondly, low filling rate is also a major challenge faced by traditional cylindrical bone harvesters. Even if the surgeon arranges the circular bone plugs tightly during the operation, it is difficult to achieve a 100% filling rate. Theoretically, the maximum filling rate of circular bone plugs is only 90.7%, which means that a considerable portion of the damaged area cannot be effectively filled, thus affecting the overall surgical outcome.

[0042] Finally, the issue of positioning rotation cannot be ignored. Due to the centrally symmetrical nature of round bone plugs, their position cannot be accurately determined by their shape after transplantation. This can lead to unnecessary rotation or displacement of the bone plug within the transplant area, affecting biomechanical properties and posing a potential threat to the patient's recovery process.

[0043] To improve the filling rate after transplantation and to define the position between bone plugs through shape features, this embodiment provides a miniature square bone harvesting device for autologous bone transplantation in ankle cartilage damage. The following is a combination of... Figures 1 to 4 This embodiment will be described in detail. It should be noted that the first direction mentioned in this embodiment is... Figure 1 The X direction in the equation.

[0044] The miniature square bone harvesting device for autologous bone transplantation in ankle cartilage damage in this embodiment mainly comprises three parts: a sleeve-type cutter 1, a handle 2, and a movable part 3. These parts work together to achieve a smooth bone harvesting operation. The sleeve-type cutter 1, as a key component of this miniature square bone harvesting device for autologous bone transplantation in ankle cartilage damage, has a unique internal structure. The sleeve-type cutter 1 has a polygonal cavity 11. The polygonal shape better conforms to the morphological characteristics of human bones, helping to more accurately cut bone plugs that meet specific shape requirements during the bone harvesting process. For example, depending on the bone harvesting requirements, the polygonal cavity 11 can be triangular, square, etc., without further limitations. The first end of the sleeve-type cutter 1 is provided with a beveled cutting section 12 with a blade 121. The blade 121 is extremely sharp and can quickly cut into bone tissue under impact. The design of the beveled cutting section 12 further optimizes the cutting effect, making the cutting process smoother, reducing resistance during cutting, and thus reducing damage to surrounding tissues. During bone harvesting, the oblique cutting section 12 can precisely cut along the predetermined trajectory, ensuring that the edges of the harvested bone plug are neat, providing high-quality bone material for subsequent bone grafting surgery. The second end of the sleeve-type cutter 1 is provided with a connecting section 13, which is an important hub connecting the sleeve-type cutter 1 and the handle 2, laying the foundation for the structural stability and ease of operation of the entire device.

[0045] The handle 2 extends along a first direction, with one end connected to the adapter 13. This design integrates the handle 2 and the sleeve-type cutter 1 into a single unit, facilitating operation by medical personnel. The ergonomic design of the handle 2, extending along the first direction, allows medical personnel to easily grip it and perform various maneuvers. In actual surgery, the handle 2 not only provides a stable grip point for medical personnel, enabling them to apply force accurately, but also prevents direct impact force on the sleeve-type cutter 1. Direct impact force on the sleeve-type cutter 1 could lead to uneven stress on the cutter, affecting cutting accuracy and potentially damaging it. The handle 2, through the adapter 13, evenly transmits the impact force to the sleeve-type cutter 1, ensuring the stability and accuracy of the cutting process and extending the device's lifespan.

[0046] The movable component 3 is slidably positioned within the polygonal cavity 11 and can move along a first direction. The movable component 3 is used to eject the bone plug within the polygonal cavity 11. This movable component 3 plays a crucial role in the bone harvesting process. After the sleeve-type cutter 1 completes the cutting of the polygonal bone plug in the harvesting area under a striking action, the bone plug remains within the polygonal cavity 11. At this point, by pushing the movable component 3, an outward thrust is generated, smoothly ejecting the polygonal bone plug located within the polygonal cavity 11. The design of the movable component 3 makes the ejection of the bone plug easier and faster. Compared to traditional miniature square bone harvesting devices used for autologous bone grafting in ankle cartilage damage, it eliminates the need for medical personnel to use additional tools to remove the bone plug, significantly saving surgical time. Simultaneously, the sliding configuration of the movable component 3 ensures smooth ejection, preventing damage to the bone plug during the process and ensuring its integrity, thus guaranteeing the success of the bone grafting surgery. During the bone harvesting phase, the bone plug will press against the movable part 3. As the depth of the sleeve-type cutter 1 into the bone harvesting area increases, the movable part 3 is gradually retracted into the polygonal cavity 11 along the first direction. After the harvesting is completed, the movable part 3 is pushed in the opposite direction of the first direction so that the movable part 3 can push out the bone plug.

[0047] In summary, the miniature square bone harvesting device for autologous bone grafting in ankle cartilage damage provided by this invention makes the bone harvesting process more efficient during bone grafting surgery. The oblique cutting portion 12 of the sleeve-type cutter 1, in conjunction with the polygonal cavity 11, can quickly and accurately cut polygonal bone plugs under percussion. The extension function of the movable part 3 further accelerates the removal speed of the bone plugs. The entire bone harvesting process is completed in one go, greatly shortening the operation time. For patients, shorter operation time means less exposure time on the operating table, reducing surgical risks and the probability of complications; for medical staff, it improves surgical efficiency, enabling them to serve more patients. During bone grafting surgery, the polygonal bone plugs can achieve face-to-face contact. Compared to traditional irregular bone blocks, this face-to-face contact method can more tightly fill the bone graft area, greatly improving the filling rate. A high filling rate means that the bone graft area can receive more adequate support and repair, providing a good environment for bone growth and healing. Furthermore, the shape characteristics of the polygonal bone plugs can also define the position between them. Each polygonal bone plug has its specific shape and angle, and they interlock with each other in the bone graft area, like assembling a kit. Figure 1 In this way, it can be accurately fixed in the corresponding position, avoiding displacement of the bone plug. Stable fixation of the bone plug helps maintain the shape and structure of the bone graft area, promotes the growth and fusion of bone cells, and thus accelerates wound healing. The design of this miniature square bone harvesting device for autologous bone grafting in ankle cartilage damage fully considers the protection of surrounding tissues. The oblique cutting section 12 of the sleeve-type cutter 1 reduces resistance during cutting, minimizing traction and damage to surrounding tissues. Simultaneously, the design of the handle 2 prevents direct impact force on the sleeve-type cutter 1, reducing potential accidental damage to surrounding tissues due to uneven force distribution on the cutter. During surgery, reducing tissue damage not only alleviates patient suffering but also reduces the risk of postoperative complications such as infection, improving the safety and success rate of the surgery.

[0048] For example, in this embodiment, the polygonal cavity 11 of the sleeve-type cutter 1 is square, and its size is designed in various specifications (such as 8mm x 8mm, 10mm x 10mm, 12mm x 12mm) according to surgical needs. Before bone grafting surgery, doctors need to formulate a detailed surgical plan based on the patient's specific condition and bone defect, including determining the size and shape of the required bone plug. The multiple specifications of the square polygonal cavity 11 provide doctors with more choices, enabling them to accurately select the appropriate size bone plug according to the actual situation. During the operation, the regular shape of the square bone plug also facilitates the doctor's positioning and placement, reducing the difficulty of the operation and the operation time. Doctors can implant the bone plug into the bone defect site more quickly and accurately, improving the efficiency and success rate of the operation. Different bone grafting surgeries have different requirements for the size of the bone plug. Smaller 8mm x 8mm bone plugs are suitable for repairing some small-area bone defects, such as bone grafting surgery in small joints of fingers and toes. This small-sized bone plug can accurately fill the defect area, reduce interference with surrounding normal tissues, and reduce surgical trauma. Larger bone plugs, such as those in the 10mm x 10mm and 12mm x 12mm sizes, are more suitable for large-area bone defects, such as in bone grafting surgeries of the hip and knee joints. Larger plugs provide more bone volume, enhancing bone support and stability, and promoting bone healing and regeneration. The variety of sizes allows this miniature square bone harvesting device for autologous bone grafting in ankle cartilage damage to be widely used in different types of bone grafting surgeries, meeting the personalized needs of different patients. The regular shape and multiple sizes of the square bone plugs help improve the stability and filling rate of the bone graft. During the bone grafting process, the square bone plugs can fit tightly together to form a stable structure. Compared to cylindrical bone blocks, the contact area between square bone plugs is larger, better able to withstand external forces, and reduce plug displacement and loosening. At the same time, the various sizes of bone plugs can be flexibly combined and filled according to the specific shape and size of the bone defect, making the grafted area denser and improving the filling rate. A high filling rate provides better conditions for bone growth and repair, promotes osteocyte proliferation and differentiation, and accelerates the bone healing process. Precise sizing and regular shape help reduce surgical risks and the incidence of complications. During bone harvesting, using a suitably sized square-shaped incision cutter minimizes damage to surrounding tissues and avoids unnecessary trauma caused by incision cutters that are too large or too small. During bone grafting, regularly shaped bone plugs can be more accurately implanted into the defect site, reducing pressure and damage to surrounding nerves, blood vessels, and other important structures. Furthermore, a stable bone graft structure and a high filling rate can reduce the likelihood of postoperative complications such as nonunion and bone resorption, improving surgical success rates and patient recovery quality. In actual surgery, surgeons can quickly select the appropriate size of the telescopic incision cutter based on preoperative planning, eliminating the need for extensive time spent trimming and shaping the bone fragments.The rapid acquisition and accurate implantation of square bone plugs made the entire surgical procedure smoother and significantly shortened the operation time. For patients, shorter operation time means less exposure time on the operating table, reducing the risk of anesthesia and infection; for medical staff, it improves surgical efficiency, enabling them to serve more patients.

[0049] Furthermore, a sliding cavity 21 is provided within the handle 2. The side wall of the sliding cavity 21 has a strip-shaped hole 22 extending along the first direction, which is a key guiding structure in the entire design. The extending direction of the strip-shaped hole 22 is consistent with the movement direction of the movable part 3, setting a clear trajectory for the movement of the movable part 3. The strip-shaped hole 22 ensures that the pin 4 on the movable part 3 slides smoothly within it, and effectively restricts the offset of the movable part 3 in other directions, ensuring that the movable part 3 always moves in a straight line along the first direction. As the core component for pushing the bone plug, one end of the movable part 3 passes through the handle 2 and is slidably positioned within the sliding cavity 21 (i.e., the front end of the movable part 3 penetrates the polygonal cavity 11 of the sleeve-type cutter 1, while the rear end of the movable part 3 moves in a controlled manner within the sliding cavity 21). The pin hole 31 provided on the movable part 3 is the key connection point for the pin 4. The miniature square bone harvesting device for autologous bone grafting in ankle cartilage damage also includes a pin 4. One end of the pin 4 is inserted into a pin hole 31, and the other end passes through a strip hole 22 and extends out of the handle 2. This forms a stable connection and motion constraint between the movable part 3 and the handle 2. This design ensures that the movable part 3 maintains a stable linear motion state during movement through the cooperation of the pin 4 and the strip hole 22, avoiding operational errors caused by motion deviation.

[0050] The pin 4 passes through the strip hole 22 and inserts into the pin hole 31. This design cleverly restricts the freedom of movement of the movable part 3. During the surgical procedure, when medical staff push the movable part 3, the pin 4 can only move along the first direction within the strip hole 22, thus ensuring that the movable part 3 can only move in a straight line along this preset direction. This strict motion constraint avoids wobbling or deviation of the movable part 3 during movement, greatly improving the stability and precision of the movement. For example, when pushing out the polygonal bone plug, stable movement ensures that the bone plug is evenly and smoothly detached from the polygonal cavity 11, avoiding problems such as bone plug jamming or damage due to unstable movement of the movable part 3, providing a reliable guarantee for the smooth progress of the surgery. When it is necessary to push out the polygonal bone plug, the pin 4 extending from the handle 2 plays an important pushing handle role. Medical staff can directly grasp the pin 4 and push the pin 4 and the movable part 3 simultaneously by applying a pushing force. This design eliminates the trouble of needing additional tools or complex operations to push the movable part 3 in traditional devices, making the operation simpler and faster. In situations where surgical time is limited, convenient operation can significantly shorten the time required to remove the bone plug, improving surgical efficiency. Simultaneously, the ergonomic design of the pin 4 allows medical staff to easily apply force, reducing operator fatigue and further enhancing the surgical experience.

[0051] Furthermore, the outer wall of the handle 2 is provided with depth scale indicators 24 along the extension direction of the strip hole 22. These scale lines are arranged in an orderly manner along the extension direction of the strip hole 22, and each scale represents a specific depth value, providing a clear reference for the depth of bone plug removal. The pin 4 also acts as a pointer in this design. When medical personnel use the miniature square bone harvesting device for autologous bone grafting in ankle cartilage damage to perform the tapping and removal operation, the pin 4 moves within the strip hole 22 along with the movable part 3, and the end of the pin 4 extending out of the handle 2 corresponds precisely to the depth scale indicator 24. This design makes the pin 4 not only a component connecting the movable part 3 and ensuring the direction of movement, but also a visual indicator of the removal depth.

[0052] During the tapping and resection procedure, medical staff can observe the depth scale corresponding to the pin 4 in real time to clearly understand the current resection depth of the bone plug. By comparing it with the pre-set target resection depth, they can adjust the tapping force and frequency in a timely manner to ensure the accurate length of the resected bone plug. For example, when a 10mm deep bone plug needs to be resected, medical staff can stop tapping immediately when the pin 4 corresponds to the 10mm mark, based on the depth scale indicator line 24, thus accurately obtaining the required length of bone plug. This precise resection method greatly improves the success rate and efficiency of the surgery, reducing repeated operations and complications caused by inaccurate resection. Bone resources in the human body are limited and precious, especially in special circumstances, such as when the patient's own bone reserve is insufficient or multiple bone grafting surgeries are required. The rational use of every inch of bone tissue is particularly important. Traditional osteotomy methods, due to the lack of precise depth control, often result in excessively long resected bone plugs, causing unnecessary waste of bone tissue. The application of the depth scale indicator line 24 allows medical staff to precisely remove bone thrombi according to surgical requirements, avoiding over-removal. Taking hip bone grafting surgery as an example, if the removed bone thrombi are too long, they may damage the surrounding healthy bone structure, affecting hip joint stability and functional recovery. Furthermore, the wasted bone tissue cannot be used for bone grafting in other areas, increasing patient suffering and medical costs. With the precise guidance of the depth scale indicator line 24, medical staff can accurately control the resection depth, obtaining only the necessary amount of bone, meeting surgical requirements while maximizing the protection of the patient's bone resources, thus optimizing the use of medical resources.

[0053] For medical staff, the depth scale indicator line 24 provides clear operational guidance, enhancing their confidence and control during surgery. When facing complex surgical situations, a clear depth reference allows them to operate more calmly, reducing tension and anxiety caused by uncertainty.

[0054] Furthermore, a planar pushing part 32 is provided at one end of the polygonal cavity 11 for the movable part 3, and a limiting step part 111 is provided inside the polygonal cavity 11. The planar pushing part 32 stops at the limiting step part 111. This planar pushing part 32 has a flat and smooth surface. During the process of pushing out the bone plug, medical staff can apply pushing force more conveniently and directly. Because the planar pushing part 32 provides a large contact area, medical staff can hold and push the movable part 3 more stably, avoiding unstable force application or slippage caused by a small contact area. For example, during surgery, when it is necessary to push out the cut bone plug from the polygonal cavity 11, the bone plug can be pushed out smoothly with a uniform and stable force, greatly improving the convenience and efficiency of the operation. The limiting step part 111 and the planar pushing part 32 cooperate with each other to play an important role in accurately limiting the cutting depth of the sleeve-type cutter 1. When the sleeve-type cutter 1 is cutting the bone plug, as the movable part 3 moves, the planar pushing part 32 will gradually approach the limiting step part 111. When the planar pushing part 32 stops at the limiting step part 111, it indicates that the sleeve-type cutter 1 has reached the preset cutting depth. This design avoids damage to surrounding normal tissue due to excessive cutting depth, or failure to obtain a bone plug of sufficient length due to insufficient cutting depth. For example, in some bone grafting surgeries with strict requirements for bone volume, precise cutting depth can ensure that the obtained bone plug is of appropriate size, meeting the needs of surgical repair while minimizing additional damage to the patient's bone, thus improving the safety and effectiveness of the surgery.

[0055] Furthermore, the handle 2 is provided with a first guide hole 23 extending in a first direction, and the movable part 3 is provided with a second guide hole 33 extending in the first direction. The guide Kirschner wire can be sequentially inserted into the first guide hole 23, the sliding cavity 21, and the second guide hole 33. In surgical procedures requiring extremely high stability, the guide Kirschner wire plays an indispensable and crucial role. One end of the guide Kirschner wire is fixed, for example, at a specific location on the patient's bone or on a fixation device on the operating table, while the other end is sequentially inserted into the first guide hole 23, the sliding cavity 21, and the second guide hole 33. Utilizing the classic guiding principle of guide post and guide hole, the miniature square bone harvesting device for autologous bone transplantation in ankle cartilage damage moves precisely along the extension direction of the guide Kirschner wire under strict guidance. This guiding method has several technical advantages. First, it greatly improves the harvesting accuracy of the miniature square bone harvesting device for autologous bone transplantation in ankle cartilage damage. Under the constraint of the guide Kirschner wire, the movement trajectory of the device is strictly limited, avoiding device deviation caused by manual operation or external factors. This allows the sleeve-type cutter 1 to accurately reach the target resection position and obtain the required bone plug. Secondly, it enhances the stability of the device. The guide Kirschner wire provides a stable reference axis for the device, reducing swaying and vibration during movement, making the surgical operation smoother and more reliable. For example, in some complex spinal bone grafting surgeries, the requirements for resection accuracy and device stability are extremely high. The application of the guide Kirschner wire can effectively meet these requirements, improving the success rate of the surgery and the patient's recovery. Furthermore, the pin 4 is provided with a clearance through hole 41, which facilitates the passage of the guide Kirschner wire through the pin 4.

[0056] For example, the sleeve-type cutter 1 is made of stainless steel. Stainless steel contains alloying elements such as chromium, which can form a dense and stable oxide film on its surface. This oxide film acts as a natural protective barrier, effectively preventing oxygen, moisture, and other corrosive substances from contacting the stainless steel substrate. In medical environments, the sleeve-type cutter 1 frequently comes into contact with various bodily fluids, disinfectants, and other corrosive substances. If ordinary metal materials are used, long-term contact with these substances can easily lead to oxidation, rust, and other corrosion phenomena, which not only affect the appearance of the cutter but also reduce its mechanical properties, causing problems such as breakage and accelerated wear during use. The stainless steel sleeve-type cutter 1, with its excellent corrosion resistance, can maintain stable performance in complex medical environments for a long time, greatly extending the cutter's service life, reducing the frequency of replacement due to cutter damage, and lowering medical costs. In bone embolus removal surgery, the sleeve-type cutter 1 needs to withstand significant forces to cut bone tissue. If the cutter's strength and hardness are insufficient, it is prone to deformation, bending, or even breakage during the cutting process, making it impossible to accurately and effectively complete the bone embolus removal task. The stainless steel sleeve-type cutter 1, with its high strength and hardness, can easily withstand the enormous stress generated during bone cutting, maintaining the shape and size of the cutter to ensure cutting precision and effectiveness. For example, when cutting harder cortical bone, the stainless steel cutter can quickly and cleanly cut the bone without problems such as uneven cutting or rough surfaces. Stainless steel has good biocompatibility and will not produce significant toxic or irritating reactions to human tissue. When the stainless steel sleeve-type cutter 1 comes into contact with human bone and surrounding tissues, it will not cause adverse reactions such as allergies or inflammation, minimizing additional harm to the patient. This is crucial for bone embolectomy surgeries that require prolonged contact with human tissue, aiding in postoperative recovery and rehabilitation.

[0057] In some applications, the adapter 13 is equipped with an internal threaded interface, and one end of the handle 2 is equipped with an external thread, connecting the handle 2 to the sleeve-type cutter 1 via a threaded connection. This threaded connection ensures a tight and stable connection between the handle 2 and the sleeve-type cutter 1. Threaded connections offer several significant advantages. First, they provide strong connection force, ensuring that the handle 2 and the sleeve-type cutter 1 do not loosen or separate during bone thrombus removal. When cutting harder bone tissue, a large force is required; if the connection is not secure, the cutter may wobble, affecting cutting accuracy and even causing unnecessary damage to surrounding tissues. The threaded connection, with its reliable connection performance, effectively avoids this situation, ensuring the smooth progress of the surgery.

[0058] In other applications, the adapter 13 is equipped with a plug-in interface, and one end of the handle 2 is also equipped with a plug-in portion, allowing the handle 2 to plug into the sleeve-type cutter 1. The plug-in connection is characterized by its ease of operation and speed. In surgical procedures, time is of the essence, especially in emergency surgeries or situations requiring rapid completion; the plug-in connection significantly reduces assembly time. The surgeon simply inserts the plug-in portion of the handle 2 accurately into the plug-in interface of the adapter 13 to complete the connection, eliminating the need for complex threading. Furthermore, the plug-in connection offers flexibility. When it is necessary to change to different specifications or types of sleeve-type cutters 1 according to different surgical needs, the plug-in connection makes the replacement process easier and faster. The surgeon can quickly disassemble the existing cutter and install the new one, improving surgical efficiency and adaptability.

[0059] Furthermore, to enhance the grip stability of the handle 2 during use, an anti-slip structure is provided on the outer wall surface of the handle 2. Exemplarily, the anti-slip structure includes various forms such as anti-slip protrusions, anti-slip grooves, or anti-slip patterns. Anti-slip protrusions are typically distributed in regular or irregular shapes on the outer wall surface of the handle 2, increasing the surface roughness and allowing the doctor to feel stronger friction when gripping. Anti-slip grooves are formed by creating grooves of a certain depth and width on the surface of the handle 2, creating an uneven surface that also increases friction during gripping. Anti-slip patterns exist on the surface of the handle 2 in the form of specific patterns or textures, such as stripes or grid patterns, which not only provide anti-slip properties but also enhance the aesthetics of the handle 2. During bone thrombectomy, the doctor needs to apply a certain amount of force to control the movement of the cutting blade. If the surface of the handle 2 is smooth, it is easy for the handle 2 to slip due to sweaty hands or uneven force, thus affecting the accuracy and safety of the surgery. The anti-slip structure effectively increases the friction between the doctor's hand and the handle 2, allowing the doctor to hold the handle 2 more stably and firmly, ensuring the accuracy of the operation even during long surgeries or when the hands are sweaty.

[0060] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A miniature square bone harvesting device for autologous bone transplantation in ankle cartilage injury, characterized in that, include: A sleeve-type cutter (1) has a polygonal cavity (11) inside. The first end of the sleeve-type cutter (1) is provided with a beveled cutting part (12) having a blade part (121), and the second end of the sleeve-type cutter (1) is provided with a connecting part (13). A handle (2) is provided extending along a first direction, and one end of the handle (2) is connected to the adapter (13); Movable component (3), which is slidably disposed in the polygonal cavity (11) and can move along the first direction, is used to push out the bone plug in the polygonal cavity (11).

2. The miniature square bone harvesting device for autologous bone transplantation in ankle cartilage injury according to claim 1, characterized in that, The handle (2) is provided with a sliding cavity (21), and the side wall of the sliding cavity (21) is provided with a strip-shaped hole (22) extending along the first direction. One end of the movable part (3) passes through the handle (2) and is slidably disposed in the sliding cavity (21). The movable part (3) is provided with a pin hole (31). The miniature square bone harvesting device for autologous bone transplantation for ankle cartilage injury further includes: A pin (4) is inserted into the pin hole (31) at one end and passes through the strip hole (22) and extends out of the handle (2) at the other end.

3. The miniature square bone harvesting device for autologous bone transplantation in ankle cartilage injury according to claim 2, characterized in that, The outer wall surface of the handle (2) is provided with a depth scale indicator line (24) along the extension direction of the strip hole (22).

4. The miniature square bone harvesting device for autologous bone transplantation in ankle cartilage injury according to claim 3, characterized in that, The movable part (3) is provided with a planar pushing part (32) at one end of the polygonal cavity (11), and a limiting step part (111) is provided inside the polygonal cavity (11), and the planar pushing part (32) stops at the limiting step part (111).

5. The miniature square bone harvesting device for autologous bone transplantation in ankle cartilage injury according to claim 2, characterized in that, The handle (2) is provided with a first guide through hole (23), and the movable part (3) is provided with a second guide through hole (33). The guide Kirschner wire can be sequentially inserted into the first guide through hole (23), the sliding cavity (21), and the second guide through hole (33).

6. The miniature square bone harvesting device for autologous bone transplantation in ankle cartilage injury according to claim 1, characterized in that, The sleeve-type cutter (1) is made of stainless steel.

7. The miniature square bone harvesting device for autologous bone transplantation in ankle cartilage injury according to claim 1, characterized in that, The adapter (13) is provided with an internal thread interface, and one end of the handle (2) is provided with an external thread. The handle (2) is threadedly connected to the sleeve-type cutter (1).

8. The miniature square bone harvesting device for autologous bone transplantation in ankle cartilage injury according to claim 1, characterized in that, The adapter (13) is provided with a plug-in interface, and one end of the handle (2) is provided with a plug-in part. The handle (2) is plugged into the sleeve-type cutter (1).

9. The miniature square bone harvesting device for autologous bone transplantation in ankle cartilage injury according to any one of claims 1-8, characterized in that, The outer wall surface of the handle (2) is provided with an anti-slip structure.

10. The miniature square bone harvesting device for autologous bone transplantation in ankle cartilage injury according to claim 9, characterized in that, The anti-slip structure includes anti-slip protrusions, anti-slip grooves, or anti-slip patterns.

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