Fastening nail adapter and fastening nail guide assembly

Abstract

The utility model relates to a fastening nail adapter and a fastening nail guide component, the fastening nail adapter comprises a main body, one end part of the main body is provided with an accommodating cavity extending along the axial direction of the main body, the longitudinal section of the accommodating cavity is set to be circular, and the cavity wall of the accommodating cavity is provided with an elastic sheet capable of expanding along the radial direction of the accommodating cavity; the end of the containing cavity is provided with a guide cavity matched with the head of the fixing nail in shape. In a non-working state, the minimum distance between the elastic piece and the central axis of the containing cavity is smaller than the inner diameter of the containing cavity. In the working state, the head of the fixing nail is embedded into the containing cavity in a blind mode, the elastic piece expands and deforms in the radial direction, the expansion deformation generates reverse elastic force to clamp the fixing nail, and the body rotates relative to the fixing nail till the head of the fixing nail is embedded into the guide cavity. The operation efficiency is influenced.

Description

Technical Field

[0001] This utility model belongs to the field of medical device technology, specifically relating to a fixation nail adapter and a fixation nail guide assembly. Background Technology

[0002] In current orthopedic surgery, fixation screws are widely used as core connecting elements to achieve rigid fixation of surgical instruments and bone implants. To ensure effective placement of the fixation screws within the implant, a combination of adapters and manipulators (including electric and manual tools) is typically employed. To ensure efficient and stable power transmission from the manipulators to the fixation screws, the conventional approach is to design locking structures of specific shapes on the screws, such as flat or square shapes, and to design matching interfaces on the corresponding adapters to guarantee close cooperation between the two. However, existing technologies have certain limitations. During assembly, the fixation screws and adapters must first be aligned, a process that increases operational complexity and time costs, causing inconvenience in practical applications and impacting surgical efficiency. Utility Model Content

[0003] In view of the various shortcomings of the existing technology, a fixation pin adapter and a fixation pin guide assembly are proposed to solve the technical problem that the assembly of fixation pins and adapters is inconvenient and affects the efficiency of surgery.

[0004] To achieve the above objectives, this utility model provides the following technical solution:

[0005] In a first aspect, the present invention provides a fixing nail adapter, comprising a main body, wherein one end of the main body is provided with a receiving cavity extending along its axial direction, the longitudinal section of the receiving cavity is circular, the cavity wall of the receiving cavity is provided with an elastic sheet that can expand radially thereon, and the end of the receiving cavity is provided with a guide cavity adapted to the shape of the fixing nail head.

[0006] In the non-working state, the minimum distance between the elastic sheet and the central axis of the receiving cavity is less than the inner diameter of the receiving cavity;

[0007] In operation, the head of the fixed pin is blindly inserted into the receiving cavity, and the elastic sheet undergoes radial expansion deformation. This expansion deformation generates a reverse elastic force to clamp the fixed pin. The main body rotates relative to the fixed pin until the head of the fixed pin is inserted into the guide cavity.

[0008] The technical solution is further configured such that the elastic sheet extends along the axial direction of the main body, its root is connected to the main body, its end is set as a free end, and a gap is left between the elastic sheet and the cavity wall of the receiving cavity to provide redundant space for its radial expansion deformation.

[0009] The technical solution is further configured such that a plurality of elastic sheets are arranged circumferentially around the receiving cavity.

[0010] The technical solution is further configured such that a guide cone surface is provided at the opening of the receiving cavity.

[0011] The technical solution is further configured such that the main body is provided with a main body flushing hole extending radially therefrom, and the main body flushing hole is connected to the guide cavity and / or the receiving cavity.

[0012] The technical solution is further configured such that the free end of the elastic sheet is configured as an arc-shaped structure, and the cavity wall of the receiving cavity corresponding to the arc-shaped structure is provided with an arc-shaped surface.

[0013] Secondly, this utility model provides a fixing nail guide assembly, including a guide and the fixing nail adapter, wherein the guide has a guide through hole for the fixing nail adapter to pass through.

[0014] The technical solution is further configured to include a sleeve, which is coaxially sleeved around the accommodating cavity, and the sleeve and the end of the fixing pin adapter are relatively fixed by an axial limiting structure.

[0015] The technical solution is further configured such that the sleeve has an inner cavity with a circular longitudinal section, a portion of the fixing nail rod is threaded into the inner cavity, and the length of the fixing nail rod outside the sleeve is the length of the bone implant into which the fixing nail is inserted.

[0016] The technical solution is further configured such that the sleeve is provided with a sleeve flushing hole extending radially therefrom, and the sleeve flushing hole is connected to the guide cavity and / or the receiving cavity.

[0017] The beneficial effects of this utility model are:

[0018] 1. By setting a circular receiving cavity, during assembly, it is not necessary to align the direction of the fixation pin and the adapter. Simply align the fixation pin with the opening of the receiving cavity and insert it directly in any direction, achieving blind embedding of the fixation pin head into the receiving cavity; by setting an elastic plate, the fixation pin is clamped by the reverse elastic force generated by its radial expansion deformation. At this time, it only fixes and does not transmit power, and will not fall off; by setting a guide cavity, during the rotation of the main body relative to the fixation pin, the fixation pin head adaptively embeds into the guide cavity, at which time power is transmitted, realizing rapid assembly of the fixation pin and the adapter, which helps to improve surgical efficiency.

[0019] 2. By setting a cannula, which cooperates with the guide hole, the fixation screw is inserted into the bone implant. During clinical operation, it is only necessary to observe the distance between the end of the cannula and the bone surface. When the end of the cannula is close to the bone surface, the fixation screw is stopped. This helps to intuitively control the length of the fixation screw and avoid the unexpected risks caused by the fixation screw being inserted too deeply or too shallowly.

[0020] 3. By setting a sleeve and a guide hole, both the sleeve and the fixing pin adapter are guided, which extends the guide length of the fixing pin and makes the guide starting point closer to the bone surface, thus improving the guide accuracy. Attached Figure Description

[0021] Figure 1 This is an isometric view of the fixing nail adapter in an embodiment of this utility model;

[0022] Figure 2 This is a top view of the fixing nail adapter in an embodiment of this utility model;

[0023] Figure 3 yes Figure 2 Sectional view of AA;

[0024] Figure 4 This is an assembly diagram of the fixing pin adapter, fixing pin, and sleeve when the fixing pin head is embedded in the guide cavity in this embodiment of the utility model.

[0025] Figure 5 yes Figure 4 BB section view;

[0026] Figure 6 This is an assembly diagram of the fixing pin adapter, fixing pin, and sleeve when the fixing pin head is embedded in the receiving cavity in this embodiment of the utility model.

[0027] Figure 7 This is an axonometric view of the sleeve in an embodiment of this utility model;

[0028] Figure 8 This is a top view of the sleeve in an embodiment of this utility model;

[0029] Figure 9 yes Figure 8 CC section view.

[0030] In the attached drawings: 101, main body; 102, receiving cavity; 103, elastic sheet; 104, guide cone surface; 105, main body flushing hole; 106, guide cavity;

[0031] 201. Head; 202. Rod; 203. Tip;

[0032] 301. First inner cavity; 302. Second inner cavity; 303. First sleeve flushing hole; 304. Second sleeve flushing hole;

[0033] 100, Fixing pin adapter; 200, Fixing pin; 300, Sleeve. Detailed Implementation

[0034] To enable those skilled in the art to better understand the technical solution of this utility model, the technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings. Based on the embodiments in this application, other similar embodiments obtained by those skilled in the art without creative effort should all fall within the scope of protection of this application. Furthermore, directional terms mentioned in the following embodiments, such as "up," "down," "left," and "right," are only for reference to the directions in the accompanying drawings; therefore, the directional terms used are for illustrative purposes and not for limiting the invention.

[0035] The present invention will be further described below with reference to the accompanying drawings and preferred embodiments.

[0036] Example 1:

[0037] According to an embodiment of this utility model, a fixing nail adapter is provided. Please refer to [link / reference]. Figures 1 to 3 The device includes a main body 101, one end of which is provided with a receiving cavity 102 extending along its axial direction. The longitudinal section of the receiving cavity 102 is circular. An elastic sheet 103 that can expand radially is provided on the cavity wall of the receiving cavity 102. The end of the receiving cavity 102 is provided with a guide cavity 106 that is adapted to the shape of the head of the fixing nail.

[0038] Furthermore, the main body 101 is made of medical-grade stainless steel, which has good biocompatibility and mechanical strength. The main body 101 is cylindrical in shape, with a receiving cavity 102 at one end, which extends along the axial direction of the main body 101, and a power interface at the other end for connection to electric or manual operating tools.

[0039] Furthermore, an elastic sheet 103 is provided on the cavity wall of the receiving cavity 102. The elastic sheet 103 extends axially along the main body 101, with its root connected to the main body 101 and its end set as a free end. The elastic sheet 103 has good elastic deformation capability and recovery performance. A gap is left between the elastic sheet 103 and the cavity wall of the receiving cavity 102 to provide redundant space for its radial expansion deformation, ensuring that the elastic sheet 103 is not obstructed by the cavity wall of the receiving cavity 102 when expanding radially.

[0040] Specifically, the elastic sheet 103 is formed by wire cutting part of the cavity wall of the receiving cavity 102. At the same time, in order to ensure that the elastic sheet 103 has good elastic deformation ability and recovery performance, the cavity wall of the receiving cavity 102 is thinned, that is, the end of the main body 101 where the receiving cavity 102 is set is set as a variable diameter structure.

[0041] Furthermore, the shape of the guide cavity 106 perfectly matches the shape of the fixing pin head, ensuring a secure connection after the fixing pin head is inserted, without loosening or falling off.

[0042] Specifically, the head shape of the fixing pin is generally designed as an AO interface, a straight interface, a square interface, a triangular interface, etc., and the guide cavity 106 is designed to be a shape that matches the above interfaces.

[0043] In one embodiment of the fixing nail adapter, please refer to... Figures 1 to 3 Several elastic sheets 103 are arranged around the circumference of the receiving cavity 102. The multiple elastic sheets 103 are evenly distributed around the circumference of the receiving cavity 102. This even distribution design ensures that the force is uniform when the fixing nail head is inserted, thus improving the stability of the connection.

[0044] Specifically, in this embodiment, there is one elastic sheet 103. In some other embodiments, there may be two, three or more elastic sheets 103.

[0045] In one embodiment of the fixing nail adapter, please refer to... Figures 1 to 3 The opening of the receiving cavity 102 is provided with a guide cone surface 104. The function of the guide cone surface 104 is to guide the head of the fixing nail to accurately embed into the receiving cavity 102, reducing the difficulty of operation and improving the success rate of embedding.

[0046] In one embodiment of the fixing nail adapter, please refer to... Figures 1 to 3 The main body 101 is provided with a main body flushing hole 105 extending radially therefrom. The main body flushing hole 105 is connected to the guide cavity 106 and / or the receiving cavity 102 to facilitate postoperative tool cleaning.

[0047] Specifically, the main body 101 is provided with a main body flushing hole 105, which is located at the end of the guide cavity 106 away from the receiving cavity 102. Since the main body flushing hole 105 is located at the far end of the guide cavity 106, the flushing fluid flows through the guide cavity 106 for a maximum length, thus improving the flushing effect.

[0048] Specifically, the main body 101 may also be provided with multiple main body flushing holes 105, which are evenly distributed around the circumference of the main body.

[0049] In one embodiment of the fixing nail adapter, please refer to... Figures 1 to 3 The free end of the elastic sheet 103 is configured as an arc-shaped structure, and the cavity wall of the corresponding receiving cavity 102 is provided with an arc-shaped surface. The arc-shaped structure disperses the stress concentration at traditional right angles or sharp corners into a continuous gradient distribution, avoiding the initiation of micro-cracks; the arc-shaped surface can serve as a guide track for the elastic sheet 103 during reset, reducing frictional losses; the double-arc matching structure significantly improves stress distribution and motion stability.

[0050] In the non-working state, the minimum distance between the elastic plate 103 and the central axis of the receiving cavity 102 is less than the inner diameter of the receiving cavity 102. This design requires the head of the fixing nail to overcome the resistance of the elastic plate 103 when it is inserted into the receiving cavity 102, thereby producing a fastening effect.

[0051] In operation, there is no need to align the fixing pin with the adapter. Simply align the fixing pin with the opening of the receiving cavity 102 and insert it directly from any direction. This allows the fixing pin head to be blindly inserted into the receiving cavity 102. Please refer to [link / reference]. Figure 6 During this process, the elastic sheet 103 undergoes radial expansion deformation, generating a reverse elastic force. This reverse elastic force clamps the fixation pin, providing fixation without transmitting power and preventing it from falling off. The fixation pin is placed at the desired bone surface position, and the electric or manual operating tool is activated and gently pressed down. At this time, the interface direction of the fixation pin remains unchanged, and the main body 101 rotates relative to the fixation pin. During this process, the head of the fixation pin adaptively embeds into the guide cavity 106. Please refer to [link to relevant documentation]. Figure 4 as well as Figure 5 At this point, power is transmitted to enable rapid assembly of the fixation pins and adapters, which helps improve surgical efficiency.

[0052] Example 2:

[0053] According to an embodiment of this utility model, a fixing pin guide assembly is provided. Please refer to [link / reference]. Figures 1 to 6 It includes a guide and the fixing pin adapter 100, wherein the guide has a guide through hole for the fixing pin adapter 100 to pass through, and the guide through hole guides the fixing pin adapter 100 equipped with the fixing pin 200.

[0054] Furthermore, the guide is a mature existing technology, and its specific structure can be referred to CN222787814U, a surgical guide tool and surgical robot. This patent document discloses that "the second guide through hole 21 can guide cylindrical instruments such as drill bits". Here, the second guide through hole is equivalent to the guide through hole in this application.

[0055] In one embodiment of the fixing pin guide assembly, please refer to... Figures 1 to 9 It also includes a sleeve 300, which is coaxially sleeved around the receiving cavity 102. The sleeve 300 and the end of the fixation pin adapter 100 are relatively fixed by an axial limiting structure. By setting the sleeve 300, the guide hole guides both the sleeve 300 and the fixation pin adapter 100, thereby extending the guide length of the fixation pin 200, making the guide starting point closer to the bone surface, and improving the guide accuracy.

[0056] Furthermore, the 300 sleeve is made of medical-grade stainless steel, which has good biocompatibility and mechanical strength.

[0057] Furthermore, the outer diameter of the sleeve 300 is equal to the outer diameter of the fixing pin adapter 100 to achieve a smooth connection. At the same time, the connection between the two is fixed by welding and is finely polished.

[0058] In one embodiment of the fixing pin guide assembly, please refer to... Figures 1 to 9 The sleeve 300 has a circular inner cavity inside, which includes a first inner cavity 301 and a second inner cavity 302. The inner diameter of the first inner cavity 301 is different from that of the second inner cavity 302 to form an axial limiting structure. The end of the fixing pin adapter 100 is embedded in the first inner cavity 301 and abuts against the axial limiting structure to achieve relative axial fixation of the sleeve 300 and the fixing pin adapter 100.

[0059] Furthermore, the fixing pin 200 includes a head 201, a rod 202, and a tip 203 in sequence. The head 201 is configured as a locking structure of a specific shape, which is adapted to the shape of the guide cavity 106. The rod 202 passes through the receiving cavity 102 and the second inner cavity 302 and extends to the outside of the sleeve 300. A thread is provided on a part of the surface of the rod 202.

[0060] Furthermore, a portion of the threaded rod 202 is embedded in the second inner cavity 302, and the length of the rod 202 outside the sleeve 300 is the length of the fixation nail 200 to be implanted into the bone implant. In other words, by pre-setting a portion of the length of the fixation nail 200 inside the sleeve 300 and the fixation nail adapter 100, the length of the exposed portion of the fixation nail 200 is the planned length of the bone implant.

[0061] Specifically, if the total length of the fixation screw 200 is L mm and the planned length of the bone implant is A mm, then the (LA) mm length is preset inside the cannula 300 and the fixation screw adapter 100. During clinical operation, it is only necessary to observe the distance between the end of the cannula 300 and the bone surface. When the end of the cannula 300 is close to the bone surface, the implantation of the fixation screw 200 is stopped. This helps to intuitively control the implantation length of the fixation screw 200 without relying on the operator's personal experience and skill level, thus avoiding unexpected risks caused by implanting the fixation screw 200 too deeply or too superficially.

[0062] In one embodiment of the fixing pin guide assembly, please refer to... Figures 1 to 9 The sleeve 300 is provided with a sleeve flushing hole extending radially therefrom, and the sleeve flushing hole is connected to the guide cavity 106 and / or the receiving cavity 102.

[0063] Furthermore, the cannula irrigation port includes a first cannula irrigation port 303 and a second cannula irrigation port 304. The first cannula irrigation port 303 is provided at the free end of the elastic sheet 103, and the second cannula irrigation port 304 is provided at the root of the elastic sheet 103 to form an irrigation channel for easy cleaning of instruments after surgery.

[0064] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0065] Optionally, specific examples in this embodiment can refer to the examples described in the above embodiments, and will not be repeated here.

[0066] The sequence numbers of the embodiments in this application are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0067] In the above embodiments of this application, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0068] The above description is only a preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A fixing nail adapter, characterized in that, The device includes a main body, one end of which is provided with a receiving cavity extending along its axial direction. The longitudinal section of the receiving cavity is circular. An elastic sheet that can expand radially is provided on the cavity wall of the receiving cavity. The end of the receiving cavity is provided with a guide cavity adapted to the shape of the head of the fixing nail. In the non-working state, the minimum distance between the elastic sheet and the central axis of the receiving cavity is less than the inner diameter of the receiving cavity; In operation, the head of the fixed pin is blindly inserted into the receiving cavity, and the elastic sheet undergoes radial expansion deformation. This expansion deformation generates a reverse elastic force to clamp the fixed pin, and the main body rotates relative to the fixed pin until the head of the fixed pin is inserted into the guide cavity.

2. The fixing nail adapter according to claim 1, characterized in that, The elastic sheet extends along the axial direction of the main body, with its root connected to the main body and its end set as a free end. A gap is left between the elastic sheet and the cavity wall of the receiving cavity to provide redundant space for its radial expansion deformation.

3. The fixing nail adapter according to claim 2, characterized in that, Several elastic sheets are arranged circumferentially around the receiving cavity.

4. The fixing nail adapter according to claim 1, characterized in that, A guide cone surface is provided at the opening of the receiving cavity.

5. The fixing nail adapter according to claim 1, characterized in that, The main body is provided with a main body flushing hole extending radially therefrom, and the main body flushing hole is connected to the guide cavity and / or the receiving cavity.

6. The fixing nail adapter according to claim 2 or 3, characterized in that, The free end of the elastic sheet is configured as an arc-shaped structure, and the cavity wall of the receiving cavity corresponding to the arc-shaped structure is provided with an arc-shaped surface.

7. A fixing pin guide assembly, characterized in that, It includes a guide and a fixing pin adapter as described in any one of claims 1-6, wherein the guide has a guide through hole for the fixing pin adapter to pass through.

8. The fixing pin guide assembly according to claim 7, characterized in that, It also includes a sleeve, which is coaxially sleeved around the periphery of the receiving cavity, and the sleeve and the end of the fixing pin adapter are relatively fixed by an axial limiting structure.

9. The fixing pin guide assembly according to claim 8, characterized in that, The sleeve has an inner cavity with a circular longitudinal section. Part of the screw rod is threaded into the inner cavity, and the length of the screw rod outside the sleeve is the length of the bone implant into which the screw is inserted.

10. The fixing pin guide assembly according to claim 8 or 9, characterized in that, The sleeve is provided with a sleeve flushing hole extending radially therefrom, and the sleeve flushing hole is connected to the guide cavity and / or the receiving cavity.

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