Ankle joint micro-fracture surgery instrument

Abstract

The utility model provides a kind of ankle joint microfracture surgery instrument, including bone drill assembly and sleeve, the bone drill assembly at least includes flexible connecting piece and drill bit, the drill bit is connected in the distal end of the flexible connecting piece;The bone drill assembly is rotatable and can be displaced and is matched in the sleeve;The distal end of the sleeve has end opening, and the end of the drill bit can be stretched out by the end opening;The sleeve includes sleeve body portion and the bending portion connected to the distal end of the sleeve body portion, the sleeve body portion is connected with the bending portion at angle, the force line of drill bit can be kept perpendicular with the cartilage under bone surface of target area, to improve surgical effect, also simultaneously reduce the risk of iatrogenic injury to surrounding healthy cartilage, can be applicable to some position tricky, processing of difficult to expose focus.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to a surgical instrument for ankle joint microfracture. Background Technology

[0002] Osteochondritis of the talus in the ankle joint is a common injury, often occurring in individuals with ankle fractures or sprains. Its pathological features include localized detachment of the articular cartilage of the talus, accompanied by subchondral bone involvement. Symptoms are usually not relieved by conservative treatment. Surgical intervention is typically required when there are free osteochondral fragments, severe bone marrow edema, secondary damage due to ligament instability, or when symptoms do not significantly improve after adequate conservative treatment.

[0003] Currently, treatment options for talus osteochondral injuries generally include bone marrow stimulation, autologous chondrocyte implantation, and cartilage transplantation. Bone marrow stimulation, including antegrade drilling, retrograde drilling, and microfracture techniques, is a commonly used clinical treatment. For small-area talus cartilage injuries (less than 1.5 cm²), bone marrow stimulation involves cleaning and scraping away the damaged tissue, then drilling holes in the subchondral bone of the cartilage defect area. This stimulates the release of bone marrow mesenchymal stem cells, which fill the cartilage defect to form fibrin clots, which can differentiate into fibrocartilage to achieve repair.

[0004] Among various bone marrow stimulation procedures, microfracture techniques are widely used in clinical practice due to their simplicity and cost-effectiveness, especially for lesions with a diameter <1.5 cm or a lesion area <1.5 cm. 2 Its efficacy in treating focal, small-area cartilage injuries has been widely recognized.

[0005] However, traditional microfracture surgery faces a key technical bottleneck. Currently, the angle of the microfracture cone is fixed, while the surface morphology of the talus injury area is complex and irregular. This makes it difficult to keep the force line of the tool perpendicular to the subchondral bone surface of the target area during operation. This angular deviation not only increases the risk of iatrogenic damage to the surrounding healthy cartilage, but also significantly reduces the surgical effectiveness, or even makes the operation ineffective, when dealing with some lesions in tricky locations and difficult to expose. Utility Model Content

[0006] Therefore, in response to at least one of the above problems, this utility model provides a surgical instrument for ankle joint microfracture.

[0007] This utility model is achieved using the following solution:

[0008] This utility model proposes an instrument for ankle joint microfracture surgery, comprising:

[0009] A bone drill assembly, the bone drill assembly including at least a flexible connector and a drill bit, the drill bit being connected to the distal end of the flexible connector;

[0010] The casing, in which the bone drill assembly is rotatably and displaceably fitted, has a distal end opening through which the end of the drill bit can extend; the casing includes a casing body and a bent portion connected to the distal end of the casing body, the bent portion having a bending angle relative to the axial direction of the casing body, thereby forming an angular connection between the casing body and the bent portion.

[0011] In one embodiment, the surgical instrument for ankle microfracture includes multiple cannulas, each cannulas having a different bending angle.

[0012] In one embodiment, the plurality of sleeves includes sleeves with bending angles of 10°, 30°, 50°, 70° or 90°.

[0013] In one embodiment, the bone drill assembly further includes a rigid connector made of metal, which is connected to the proximal end of the flexible connector.

[0014] In one embodiment, the flexible connector is a spring.

[0015] In one embodiment, the distal end of the sleeve is designed with a side opening for the discharge of drill bone debris.

[0016] In one embodiment, the drill bit is provided with a self-tapping groove.

[0017] In one embodiment, the distal end of the sleeve is provided with a tapered section, the diameter of which gradually decreases from the proximal end to the distal end.

[0018] In one embodiment, the surgical instrument for ankle microfractures further includes a handle connected to the proximal end of the cannula.

[0019] In one embodiment, the handle is a hollow structure with openings at both ends, and the bone drill assembly passes through the handle.

[0020] The technical solution provided by this utility model has the following technical effects:

[0021] This invention provides a surgical instrument for ankle microfracture surgery, including a bone drill assembly and a cannula. The bone drill assembly includes at least a flexible connector and a drill bit, with the drill bit connected to the distal end of the flexible connector. The bone drill assembly is rotatable and displaceable within the cannula. The distal end of the cannula has an end opening through which the end of the drill bit can extend. The cannula includes a cannula body and a bent portion connected to the distal end of the cannula body. The cannula body and the bent portion are connected at an angle, allowing the force line of the drill bit to remain perpendicular to the subchondral bone surface of the target area, thereby improving surgical outcomes and reducing the risk of iatrogenic damage to surrounding healthy cartilage. This invention is suitable for treating lesions in difficult-to-visual locations. The ankle microfracture surgical instrument provided in this embodiment significantly improves the precision and safety of microfracture surgery. Its unique design ensures uniform and controllable drilling, effectively protecting surrounding normal cartilage tissue while significantly reducing the risk of drill heat generation and iatrogenic fractures. The uniform pores facilitate sufficient exudation of bone marrow fluid, creating better biological conditions for cartilage repair. Furthermore, the instrument is easy to operate, effectively shortening surgical time and accelerating postoperative recovery, making it an ideal choice for improving the safety and efficacy of ankle arthroscopic microfracture surgery. Attached Figure Description

[0022] Figure 1 This is a perspective view of the surgical instrument for ankle joint microfracture according to an embodiment of the present invention;

[0023] Figure 2 yes Figure 1 Enlarged view of point A in the middle;

[0024] Figure 3 This is a perspective view of the ankle joint microfracture surgical instrument of this embodiment from another direction;

[0025] Figure 4 This is a full sectional view of the surgical instruments for ankle microfracture surgery according to this embodiment;

[0026] Figure 5 This is a partially enlarged view of the distal end of the sleeve in this embodiment;

[0027] Figures 6-9 It is a partial view of the distal end of the casing with different bending angles. Detailed Implementation

[0028] To further illustrate the various embodiments, the present invention provides accompanying drawings. These drawings are part of the disclosure of the present invention and are mainly used to illustrate the embodiments, and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these drawings, those skilled in the art should be able to understand other possible implementations and the advantages of the present invention. Components in the drawings are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0029] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments.

[0030] like Figures 1-5 As shown, this embodiment provides a surgical instrument 1 for ankle joint microfracture surgery, including a cannula 10, a bone drill assembly 20, and a handle 30. The diameter of the cannula 10 is designed to at least partially accommodate the bone drill assembly 20; in some embodiments, the diameter of the cannula 10 is 1.5–2.5 mm.

[0031] The bone drill assembly 20 is rotatably and displaceably fitted within the cannula 10. The end of the ankle microfracture surgical instrument 1 closest to the operator (i.e., the surgeon) is defined as the proximal end, and the end closest to the patient as the distal end. The cannula 10 includes a cannula body 11 and a bent portion 12 connected to the distal end of the cannula body 11. The cannula body 11 and the bent portion 12 are connected at an angle. Figure 5 As shown, in this embodiment, the bending angle B of the bent portion 12 relative to the axial direction of the sleeve body portion 11 is 10°.

[0032] The bone drill assembly 20 includes a rigid connector 21, a flexible connector 22, and a drill bit 23 connected sequentially from proximal to distal. The drill bit 23 is connected to the distal end of the flexible connector 22, and the rigid connector 21 is connected to the proximal end of the flexible connector 22. The rigid connector 21 is connected to a power source via a transmission member, which provides power for rotational and axial displacement of the bone drill assembly 20. When the bone drill assembly 20 is housed within the cannula 10, the flexible connector 22 is located at the junction of the cannula body 11 and the bend 12, allowing the bone drill assembly 20 to fit within the angled connection of the cannula body 11 and the bend 12. The distal end of the cannula 10 has an end opening 13 through which the distal end of the drill bit 23 can extend, facilitating drilling operations during surgery. The cannula body 11 and the bent part 12 are connected at an angle, and the force line of the drill bit 23 can remain perpendicular to the subchondral bone surface of the target area, thereby improving the surgical effect and reducing the risk of iatrogenic damage to the surrounding healthy cartilage. It can be applied to the treatment of some lesions in tricky locations and difficult to expose.

[0033] In this embodiment, the bending angle B of the bent portion 12 relative to the axial direction of the sleeve body portion 11 is 10°, but it is not limited to this. For example, the bending angle of the bent portion 12 relative to the axial direction of the sleeve body portion 11 can also be 30°, 50°, 70°, or 90°, etc., respectively. Figures 6-9 The bending angles are shown as B1, B2, B3, or B4. Multiple sleeves 10 with different bending angles can be provided, allowing for the selection of different angles of the ankle microfracture surgical instrument 1 during surgery, thus enabling the ankle microfracture surgical instrument 1 to adapt to different angle requirements during surgery, ensuring that the force line of the drill 23 remains perpendicular to the subchondral bone surface of the target area.

[0034] The handle 30 is connected to the proximal end of the sleeve 10. The handle 30 is a hollow structure with openings at both ends. The bone drill assembly 20 is set through the handle 30. The handle 30 allows for convenient and stable gripping, preventing shaking during drilling.

[0035] In this embodiment, the flexible connector 22 is a spring. Springs transmit large torques and are readily available. However, it is not limited to this; the flexible connector 22 can also be a flexible shaft, etc. The rigid connector 21 is made of metal. Of course, in some embodiments, the rigid connector 21 can be omitted, and the transmission can be directly performed using the flexible connector 22, which is also a feasible technical solution. In this embodiment, the rigid connector 21 in the bone drill assembly 20 increases the overall rigidity of the bone drill assembly 20, which is beneficial for the drilling operation of the bone drill assembly 20, and makes it easier to connect to a power source, such as an electric drill, through the rigid connector 21.

[0036] The distal end of the sleeve 10 is designed with a side opening 14 to facilitate the removal of drilled bone debris. The drill bit 23 is provided with a self-tapping groove to facilitate drilling into bone or cartilage tissue and can cooperate with the side opening 14 to facilitate debris removal.

[0037] The distal end of the cannula 10 is provided with a tapered section 101, the diameter of which gradually decreases from the proximal end to the distal end, thereby facilitating passage through the surgical inlet. In one embodiment, the tapered section 101 serves as a bend 12.

[0038] During use, the patient lies supine. Palpation of the medial malleolus and tibialis anterior tendon in the lower limb serves as a landmark for the anteromedial approach. Palpation of the lateral malleolus and extensor digitorum longus muscles in the lower limb confirms the landmark for the anterolateral approach, establishing the surgical approach. The ankle microfracture surgical instrument 1 is inserted into the left ankle joint cavity through the anterolateral approach. One hand holds the handle 30, while the other hand holds an electric drill as a power source to perform microfracture surgery in the ankle joint cavity.

[0039] The ankle arthroscopic microfracture surgical instrument 1 provided in this embodiment significantly improves the precision and safety of microfracture surgery. Its unique design ensures uniform and controllable drilling, effectively protecting surrounding normal cartilage tissue while greatly reducing the risk of drill heat generation and iatrogenic fractures. The uniform channels facilitate sufficient exudation of bone marrow fluid, creating better biological conditions for cartilage repair. In addition, the instrument is easy to operate, effectively shortening the operation time and thus accelerating postoperative recovery, making it an ideal choice for improving the safety and efficacy of ankle arthroscopic microfracture surgery.

[0040] Although the present invention has been specifically shown and described in conjunction with preferred embodiments, those skilled in the art should understand that various changes in form and detail may be made to the present invention without departing from the spirit and scope of the present invention as defined in the appended claims, and all such changes shall be within the scope of protection of the present invention.

Claims

1. An instrument for ankle joint microfracture surgery, characterized in that, include: A bone drill assembly, the bone drill assembly including at least a flexible connector and a drill bit, the drill bit being connected to the distal end of the flexible connector; The casing, in which the bone drill assembly is rotatably and displaceably fitted, has a distal end opening through which the end of the drill bit can extend; the casing includes a casing body and a bent portion connected to the distal end of the casing body, the bent portion having a bending angle relative to the axial direction of the casing body, thereby forming an angular connection between the casing body and the bent portion.

2. The surgical instrument for ankle joint microfracture according to claim 1, characterized in that: The surgical instruments for ankle microfracture include multiple cannulas, each with a different bending angle.

3. The surgical instrument for ankle joint microfracture according to claim 2, characterized in that: The plurality of sleeves includes sleeves with a bending angle of 10°, 30°, 50°, 70° or 90°.

4. The surgical instrument for ankle joint microfracture according to claim 1, characterized in that: The bone drill assembly also includes a rigid connector, which is made of metal and is connected to the proximal end of the flexible connector.

5. The surgical instrument for ankle joint microfracture according to claim 1, characterized in that: The flexible connector is a spring.

6. The surgical instrument for ankle joint microfracture according to claim 1, characterized in that: The distal end of the sleeve is designed with a side opening for the discharge of drill bone debris.

7. The surgical instrument for ankle joint microfracture according to claim 6, characterized in that: The drill bit is equipped with a self-tapping groove.

8. The surgical instrument for ankle joint microfracture according to claim 1, characterized in that: The distal end of the sleeve is provided with a tapered section, the diameter of which gradually decreases from the proximal end to the distal end.

9. The surgical instrument for ankle joint microfracture according to claim 1, characterized in that: The surgical instrument for ankle microfractures also includes a handle connected to the proximal end of the cannula.

10. The surgical instrument for ankle joint microfracture according to claim 9, characterized in that: The handle is a hollow structure with openings at both ends, and the bone drill assembly is disposed through the handle.

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