Kirschner wire sleeve device for muscle layer expansion

Abstract

The invention discloses a kirschner wire sleeve device for muscle layer expansion, which relates to the technical field of orthopedic surgery and comprises a kirschner wire, an expansion sleeve, a protective layer and a traction rod. The expansion sleeve is composed of a support and an expansion layer, a guide ring is arranged in the middle of the support, symmetrical connecting frames are arranged on the outer side of the guide ring, the expansion layer is sleeved outside the guide ring, and one end close to a skeleton is of an involute pipeline structure. After the Kirschner wire fixes the bone, the guide ring slides towards the bone along the Kirschner wire, the involute pipeline structure of the expansion layer enters the space between the Kirschner wire and the muscle layer, and the muscle layer is pushed away outwards to form an operation space. The protective layer can reduce direct friction between the muscle layer and the expansion layer, and the lubricant arranged in the protective layer can assist operation; the traction rod can stably control the expansion layer to be opened. The device is made of a biocompatible material and is provided with a buffer structure, the operation space can be flexibly adjusted, the operation safety, adaptability and efficiency are effectively improved, and the use pain point of a traditional kirschner wire sleeve device is solved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of orthopedic surgery, in particular to a Kirschner wire sleeve device for muscle layer expansion. BACKGROUND

[0002] As a core positioning and fixing instrument in orthopedic surgery, Kirschner wire (K-wire) has been tested for more than a hundred years and plays a key role in positioning and guiding and stable support in spine, limb fracture and multiple orthopedic surgeries. Its material has evolved from early copper and iron materials to stainless steel, and now the mainstream is titanium alloy and experimental biodegradable materials, which not only optimizes the strength and toughness, but also reduces postoperative rejection reaction through excellent biocompatibility, and adapts to long-term implantation needs.

[0003] In some surgeries, such as reduction of proximal humerus fracture in children, osteotomy for hallux valgus correction, etc., an operation space needs to be created around the Kirschner wire for other surgical instruments to operate in the operation space, at which time a muscle layer expansion device is needed to expand the muscle layer around the Kirschner wire.

[0004] However, the current muscle layer expansion device lacks targeted anti-injury structure and lubrication mechanism, which is easy to cause muscle incision, inflammation and postoperative atrophy due to instrument friction and sharp edge contact, and the insufficient biocompatibility may also cause foreign body rejection reaction; at the same time, the current muscle layer expansion device has weak guiding positioning and expansion adjustment ability, the expansion layer is difficult to achieve uniform expansion around the Kirschner wire, and the operation space position cannot be flexibly adjusted according to the surgical needs, which is easy to cause positioning deviation or out-of-control expansion range. SUMMARY

[0005] The application provides a Kirschner wire sleeve device for muscle layer expansion, which specifically comprises a Kirschner wire and an expansion sleeve, the Kirschner wire is fixed on the bone, and the expansion sleeve is sleeved outside the Kirschner wire and slides to the junction of the Kirschner wire and the bone from the outside to expand the muscle layer in the way, the expansion sleeve comprises a support and an expansion layer, the middle part of the support is provided with a guide ring, the expansion layer is sleeved outside at least one guide ring, the outside of the guide ring is provided with left-right symmetrical connecting frames, and the inner wall of the expansion layer is fixedly connected with the connecting frames, and the end of the expansion layer close to the bone is a gradually opening pipe structure.

[0006] After the Kirschner wire is fixed on the bone, the guide ring is sleeved outside the Kirschner wire and slides to the bone along the Kirschner wire, in the sliding process, the gradually opening pipe structure of the expansion layer enters between the Kirschner wire and the muscle layer, and pushes the muscle layer away from the outside of the Kirschner wire in the sliding process, until the end of the expansion layer close to the bone approaches the bone, and an operation space is formed in the expansion layer.

[0007] Preferably, a protective layer is also included, which is a highly elastic tubular structure that is fitted onto the outside of the Kirschner wire before the expansion sleeve is installed, and the expansion layer is inserted between the protective layer and the Kirschner wire.

[0008] Preferably, the protective layer has an inner cavity with a lubricant inside, the lubricant being either a silicone-based gel or a water-based gel; the protective layer has exudation pores that communicate with the outside and the inner cavity.

[0009] Preferably, the expansion layer has an opening section at the end near the bone, the opening section being composed of multiple highly elastic blades, the diameter of which is the same as the diameter of the end of the expansion layer away from the bone in the initial state; the opening section can be contracted into an gradually opening tube structure.

[0010] Preferably, the expansion layer also includes a traction rod, which is a rigid straight rod; the expansion layer has an opening section at one end near the bone, the opening section is composed of multiple highly elastic blades, and in the initial state, the opening section is an involute pipe structure; the expansion layer has a traction hole that penetrates the expansion layer, and the traction hole corresponds one-to-one with the blades of the opening section, and the traction rod can be inserted into the traction hole to drive the opening section to open.

[0011] Preferably, the end of the protective layer away from the bone has a gradually widening trumpet-shaped opening.

[0012] Preferably, the guide ring has guide grooves formed by inclined surfaces at both the upper and lower ends inside, which facilitates the guide ring being fitted onto the outside of the Kirschner wire.

[0013] Preferably, the connecting frame is made of an elastic material, and the connecting frame between the guide ring and the expansion layer is inclined and fixedly connected to both.

[0014] Preferably, the elastic deformation range of the protective layer is adapted to the radial dimensional changes of the expansion layer from a constricted involute tube structure to a fully open state, ensuring that the protective layer always closely adheres to and wraps around the outside of the expansion layer as the expansion layer slides along the Kirschner wire.

[0015] Preferably, the expansion layer has a buffer structure at the end of the tube near the bone to prevent cutting injuries to the muscle layer.

[0016] Beneficial effects

[0017] 1. This invention significantly improves the safety and reliability of muscle layer expansion procedures, effectively reducing surgical damage to human tissues. On one hand, the expansion layer is made of biocompatible metals such as titanium and titanium alloys, and cobalt-chromium alloys, which can match the adaptability of human tissues, reducing postoperative inflammation and rejection reactions. Furthermore, its end near the bone has a rounded corner or annular buffer structure, preventing cuts to the muscle layer during expansion. On the other hand, the design of the protective layer further optimizes operational safety—the highly elastic protective layer forms a diaphragm between the muscle layer and the expansion layer, reducing direct friction between them. Simultaneously, the lubricant built into the inner cavity of the protective layer can seep out through exudation holes to form a lubricating layer, facilitating smooth sliding of the expansion layer and providing convenience for subsequent removal of the protective layer, thus reducing traction and stimulation to the muscle tissue throughout the process. In addition, the involute channel structure of the expansion layer, combined with the centered positioning of the guide ring, allows the muscle layer to expand uniformly around the Kirschner wire, forming a regular operating space, laying the foundation for precise manipulation of orthopedic instruments on the bone.

[0018] 2. This invention possesses excellent flexibility and wide applicability, adapting to the needs of different surgical scenarios and improving surgical efficiency. From a structural adjustment perspective, the connecting frame of the stent is made of elastic material and connects the guide ring and the expansion layer at an angle, allowing the expansion layer to undergo slight translation after initial expansion. This enables flexible adjustment of the relative position of the operating space and the bone, meeting the operational needs of different surgical sites. From an expansion method perspective, the device offers multiple adaptation options—expansion can be achieved through the high elasticity and recovery force of the opening segment itself, suitable for scenarios with specific requirements for operating space area; alternatively, the opening segment can be driven to open by inserting a traction rod into the traction hole, avoiding changes in the operating space area due to external forces, ensuring stable expansion effects, and adapting to complex surgeries requiring larger instruments. Simultaneously, the guide groove design inside the guide ring facilitates quick mounting of the device onto the outside of the Kirschner wire screw, simplifying the assembly process and improving the overall convenience and efficiency of surgical operations. This solves the problems of irregular operating space and poor adaptability of traditional Kirschner wire screw cannula devices. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings of the embodiments will be briefly described below.

[0020] The accompanying drawings described below are only related to some embodiments of the invention and are not intended to limit the invention.

[0021] In the attached diagram:

[0022] Figure 1 A three-dimensional structural schematic diagram of a Kirschner wire sleeve device according to an embodiment of the present invention is shown.

[0023] Figure 2 An exploded view of a Kirschner wire sleeve device according to an embodiment of the present invention is shown.

[0024] Figure 3 A three-dimensional structural schematic diagram of the Kirschner wire sleeve device in its initial state according to an embodiment of the present invention is shown.

[0025] Figure 4 A cross-sectional view of the protective layer of a Kirschner wire sleeve device according to an embodiment of the present invention is shown.

[0026] Figure 5 A Kirschner wire sleeve device according to an embodiment of the present invention is shown. Figure 4 A schematic diagram of the three-dimensional structure at point A shown.

[0027] Figure 6 A top view of a Kirschner wire sleeve device according to an embodiment of the present invention is shown.

[0028] Figure 7 An assembly diagram of the support for the Kirschner wire sleeve device according to an embodiment of the present invention is shown.

[0029] Figure 8 An assembly diagram of the support for a Kirschner wire sleeve device according to another embodiment of the present invention is shown.

[0030] Figure 9 An assembly diagram of the expansion layer of a Kirschner wire sleeve device according to another embodiment of the present invention is shown.

[0031] Figure 10 A three-dimensional cross-sectional schematic diagram of the expansion layer of a Kirschner wire sleeve device according to another embodiment of the present invention is shown.

[0032] Figure 11 A schematic diagram of the Kirschner wire sleeve device in an open state according to another embodiment of the present invention is shown.

[0033] Figure 12 A top view of the Kirschner wire sleeve device in an open state according to another embodiment of the present invention is shown.

[0034] List of main reference numerals

[0035] 1. Kirschner wire;

[0036] 2. Protective layer; 201. Inner cavity; 202. Exudation hole;

[0037] 3. Bracket; 301. Guide ring; 302. Guide groove; 303. Connecting bracket;

[0038] 4. Expansion layer; 401. Opening section; 402. Traction hole;

[0039] 5. Towing rod. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0041] In this document, “illustrative” means “serving as an example, illustration or description”, and any illustration or implementation described herein as “illustrative” should not be construed as a more preferred or advantageous technical solution.

[0042] To keep the drawings concise, only the parts relevant to this application are shown schematically in each drawing, and they do not represent the actual structure of the product. In addition, to make the drawings concise and easy to understand, in some drawings, only one of the components with the same structure or function is shown schematically, or only one of them is labeled.

[0043] In this document, unless otherwise expressly specified and limited, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance; unless otherwise specified or explained, the term "multiple" refers to two or more; the terms "connected," "fixed," etc., should be interpreted broadly. For example, "connected" can be a fixed connection, a detachable connection, an integral connection, or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0044] Example: Please refer to Figures 1 to 12 :

[0045] This invention proposes a Kirschner wire cannula device for muscle layer expansion, comprising:

[0046] like Figure 1 and Figure 2 As shown, in this embodiment, the inlet diameter of the gradually opening channel structure of the expansion layer 4 is larger than the diameter of the Kirschner nail 1, and the diameter gradually increases in the direction away from the bone. The expansion layer 4 preferably uses a biocompatible metal, such as titanium and titanium alloys, cobalt-chromium alloys, medical stainless steel, etc., to match the adaptability of human tissue and reduce inflammation and rejection reactions.

[0047] It should be noted that at the end of the expansion layer 4 closest to the bone, the opening needs to be rounded or ring-shaped to prevent the edge of the expansion layer 4 opening from cutting the muscle layer.

[0048] The above operating space can be referenced. Figure 6The shaded area is used for other instruments to manipulate the bone.

[0049] The support 3 consists of a guide ring 301 and a connecting frame 303, and is installed inside the expansion layer 4. Generally, the guide ring 301 is located at the center of the expansion layer 4. When the support 3 is fitted on the outside of the Kirschner wire 1, the Kirschner wire 1 is also located at the center of the expansion layer 4, so that the muscle layer expands with the Kirschner wire 1 as the center, and the operating space formed after expansion is more regular and uniform.

[0050] In one embodiment, such as Figure 7 As shown, the guide ring 301 has guide grooves 302 formed by inclined surfaces at both the upper and lower ends, which facilitates the guide ring 301 being fitted onto the outside of the Kirschner nail 1.

[0051] It should be noted that in the above embodiments, when the end of the expansion layer 4 near the bone enters between the muscle layer and the Kirschner screw 1, it is generally necessary to first expand the area between the muscle layer and the Kirschner screw 1 to form an entrance for the expansion layer 4. Since this expansion is only on the surface of the muscle layer, conventional expansion methods, such as traction expansion, can be used.

[0052] like Figure 3 and Figure 4 As shown, in another embodiment, before the expansion sleeve is installed on the Kirschner screw 1, a protective layer 2 can be first fitted on the outside of the Kirschner screw 1. The protective layer 2 is a highly elastic tubular structure with a gradually opening trumpet-shaped opening at the end away from the bone. When the expansion layer 4 is installed on the outside of the Kirschner screw 1, it can be guided by the trumpet-shaped opening of the protective layer 2 and slide downward, so that the protective layer 2 will undergo elastic deformation under the compression action on the inside and wrap around the outside of the expansion layer 4, forming a diaphragm between the muscle layer and the expansion layer 4.

[0053] In the above embodiments, such as Figure 5 As shown, an inner cavity 201 can also be provided inside the protective layer 2. A lubricant, such as a silicone-based or water-based gel, can be placed in the inner cavity 201. During the process of the expansion layer 4 sliding along the Kirschner wire 1, it will also squeeze the protective layer 2, thereby causing the lubricant in the inner cavity 201 to seep out through the seepage holes 202 on the inner cavity 201, forming a lubricating layer between the muscle layer and the protective layer 2, which makes it easier for the protective layer 2 to be withdrawn after the expansion layer 4 reaches the predetermined position.

[0054] The mention here of protective layer 2 being removed between the muscle layer and expansion layer 4 specifically refers to expansion layer 4 in another embodiment, such as... Figure 9As shown, in this embodiment, the expansion layer 4 has an opening section 401 at the end near the bone. The opening section 401 is composed of multiple highly elastic blades. In the initial state, the diameter of the opening section 401 is the same as the diameter of the end of the expansion layer 4 away from the bone. When needed, the elasticity of the opening section 401 causes it to contract into an involute tube structure and enter between the protective layer 2 and the Kirschner screw 1. The elastic deformation range of the protective layer 2 adapts to the radial dimension change of the expansion layer 4 from the contracted involute tube structure to the fully open state. At this time, the protective layer 2 has a limit to elastic deformation. This limit further restricts the opening range of the opening section 401 until the opening section 401 reaches the area around the bone. After the protective layer 2 is removed, the opening section 401 tends to return to its initial state, expanding the muscle layer. Compared with the expansion layer 4 that directly uses the opening of the involute tube structure, this method can form a larger operating space inside the expansion layer 4, which is suitable for situations where other instruments with larger volumes need to be used.

[0055] Based on the above embodiments, in order to solve the problem that the expanded operating space area is unstable and prone to area change under external forces when using the elasticity of the opening segment 401 for expansion, the following methods can also be used to achieve stable expansion, such as... Figure 10 and 11 As shown, a flexible opening segment 401 is also used, but in this embodiment, the initial state of the opening segment 401 is also a gradually opening and closing state. The expansion layer 4 also has traction holes 402 penetrating through it. Each traction hole 402 corresponds to a blade of the opening segment 401. After the expansion layer 4 approaches the bone, a rigid traction rod 5 is inserted into the traction hole 402. The traction rod 5 opens the opening segment 401, achieving expansion. Using this method, a stable operating space can be formed, ensuring that other instruments can be operated within this space. Figure 12 The shaded area is shown.

[0056] This device also uses another type of support 3, which allows for slight translation of the expansion layer 4 after expansion, adjusting the relative position of the operating space to the bone, such as... Figure 8 As shown, the connecting frame 303 is made of elastic material, and the connecting frame 303 between the guide ring 301 and the expansion layer 4 is inclined to connect the two.

[0057] The above description is merely a specific embodiment of this application. Under the guidance of the above teachings, those skilled in the art can make other improvements or modifications based on the above embodiments. Those skilled in the art should understand that the above specific description is only to better explain the purpose of this application, and the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A Kirschner wire cannula device for muscle layer expansion, comprising a Kirschner wire (1) and an expansion cannula, wherein the Kirschner wire (1) is fixed to a bone, and the expansion cannula is fitted over the outside of the Kirschner wire (1) and slides from the outside to the junction of the Kirschner wire (1) and the bone to expand the muscle layer along the path, characterized in that, The expansion sleeve includes a support (3) and an expansion layer (4). The support (3) has a guide ring (301) in the middle. The expansion layer (4) is fitted on the outside of at least one guide ring (301). The guide ring (301) has symmetrical connecting frames (303) on the left and right sides on the outside. The inner wall of the expansion layer (4) is fixedly connected to the connecting frame (303). The end of the expansion layer (4) near the bone has an involute tube structure. After the Kirschner screw (1) is fixed to the bone, the guide ring (301) is fitted on the outside of the Kirschner screw (1) and slides along the Kirschner screw (1) toward the bone. During the sliding process, the involute channel structure of the expansion layer (4) enters between the Kirschner screw (1) and the muscle layer, and pushes the muscle layer toward the outside of the Kirschner screw (1) during the sliding process until the end of the expansion layer (4) close to the bone approaches the bone, forming an operating space inside the expansion layer (4).

2. The Kirschner wire cannula device for muscle layer expansion according to claim 1, characterized in that, It also includes a protective layer (2), which is a highly elastic tubular structure. It is fitted on the outside of the Kirschner nail (1) before the expansion sleeve is installed, and the expansion layer (4) is inserted between the protective layer (2) and the Kirschner nail (1).

3. The Kirschner wire cannula device for muscle layer expansion according to claim 2, characterized in that, The protective layer (2) has an inner cavity (201) inside, and the inner cavity (201) contains a lubricant, which includes any one of silicone gel and water gel; the protective layer (2) has an exudation hole (202) that communicates with the outside and the inner cavity (201).

4. The Kirschner wire cannula device for muscle layer expansion according to claim 1, characterized in that, The expansion layer (4) has an opening section (401) at one end near the bone. The opening section (401) is composed of multiple highly elastic blades. In the initial state, its diameter is the same as the diameter of the expansion layer (4) at the end away from the bone. The opening section (401) can be contracted into an opening pipe structure.

5. The Kirschner wire cannula device for muscle layer expansion according to claim 1, characterized in that, It also includes a traction rod (5), which is a rigid straight rod; the expansion layer (4) has an opening section (401) at one end near the bone, which is composed of multiple highly elastic blades. In the initial state, the opening section (401) is an involute pipe structure; the expansion layer (4) has a traction hole (402) that penetrates the expansion layer (4), and the traction hole (402) corresponds one-to-one with the blades of the opening section (401). The traction rod (5) can be inserted into the traction hole (402) to drive the opening section (401) to open.

6. A Kirschner wire cannula device for muscle layer expansion according to claim 2, characterized in that, The protective layer (2) has a gradually opening trumpet-shaped opening at the end away from the bone.

7. The Kirschner wire cannula device for muscle layer expansion according to claim 1, characterized in that, The guide ring (301) has guide grooves (302) formed by inclined surfaces at both the upper and lower ends inside, which facilitates the guide ring (301) to be fitted onto the outside of the Kirschner nail (1).

8. The Kirschner wire cannula device for muscle layer expansion according to claim 1, characterized in that, The connecting frame (303) is made of elastic material, and the connecting frame (303) between the guide ring (301) and the expansion layer (4) is in an inclined state and fixedly connected to both.

9. A Kirschner wire cannula device for muscle layer expansion according to claim 2, characterized in that, The elastic deformation range of the protective layer (2) is adapted to the radial dimension change of the expansion layer (4) from the constricted involute pipe structure to the fully open state, ensuring that the protective layer (2) always closely adheres to and wraps the outside of the expansion layer (4) during the sliding process of the expansion layer (4) along the Kirschner nail (1).

10. A Kirschner wire cannula device for muscle layer expansion according to claim 1, characterized in that, The expansion layer (4) has a buffer structure at the end of the tube near the bone to avoid cutting the muscle layer.

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