Intramedullary nail extractor

Abstract

The utility model discloses an intramedullary nail extractor which comprises a connecting rod, a sleeve and a locking piece. Wherein the head end of the connecting rod is used for being connected with the tail end of an intramedullary nail, a ball head is arranged at the tail end of the connecting rod, the tail end of the connecting rod penetrates through a penetrating hole in the top of the head end of the sleeve and enables the ball head to be located in the head end of the sleeve, and the locking piece is used for locking the ball head so that the connecting rod and the sleeve can be fixed. And the releasing device is used for releasing the ball head so that the ball head can rotate at will to adjust the direction of the connecting rod relative to the sleeve. The intramedullary nail extractor does not need to enlarge a surgical incision, can be accurately connected with a threaded hole in the tail end of the intramedullary nail to extract the intramedullary nail, is convenient and rapid to operate, and effectively reduces risks of surgical bleeding and infection.

Description

Technical Field

[0001] This utility model relates to orthopedic medical devices, specifically to an intramedullary nail removal device. Background Technology

[0002] Intramedullary nails are orthopedic internal fixation implants in the field of medical devices. The tail end of the intramedullary nail has a screw hole for connecting to the implantation device and the removal device.

[0003] Following intramedullary nailing surgery, the removal of the intramedullary nail needs to be scheduled based on the patient's recovery. Currently, the removal method involves connecting the threaded end of an intramedullary nail extractor to the threaded hole at the tail end of the intramedullary nail and pulling it out. However, in actual surgical practice, due to limitations imposed by the surgical incision and patient positioning, it is difficult to accurately align the intramedullary nail extractor with the threaded end, making removal impossible in a short time. This necessitates enlarging the surgical incision and repeating the procedure to achieve a proper connection. Clinically, these factors often lead to prolonged surgical time and increase the risk of surgical bleeding and infection. Utility Model Content

[0004] This invention aims to solve at least one of the technical problems existing in the prior art. Therefore, one objective of this invention is to provide an intramedullary nail removal device that does not require enlarging the surgical incision, can accurately connect to the threaded hole at the tail end of the intramedullary nail, removes the nail, and is convenient and quick to operate, effectively reducing the risk of surgical bleeding and infection.

[0005] An intramedullary nail extractor according to an embodiment of the present invention includes a connecting rod, a sleeve, and a locking member; wherein, the head end of the connecting rod is used to connect to the tail end of the intramedullary nail, the tail end of the connecting rod is provided with a ball head, the tail end of the connecting rod passes through a perforation on the top of the head end of the sleeve and the ball head is located inside the head end of the sleeve; the locking member is used to lock the ball head to fix the connecting rod to the sleeve, and to release the ball head so that the ball head can rotate arbitrarily to adjust the direction of the connecting rod relative to the sleeve.

[0006] In this embodiment of the intramedullary nail extractor, during use, the ball head is released by the locking member, allowing the ball to rotate in any direction to facilitate adjustment of the direction of the connecting rod relative to the sleeve, so that the direction of the connecting rod matches the direction of the intramedullary nail. The connecting rod is then connected and fixed to the tail end of the intramedullary nail. Next, the direction of the sleeve is adjusted and the ball head is locked by the locking member to fix the connecting rod to the sleeve. Finally, the intramedullary nail is pulled out by connecting the sliding hammer to the sleeve.

[0007] The intramedullary nail removal device of this invention has the following advantages: it does not require enlarging the surgical incision; by adjusting the direction of the connecting rod, it can be accurately connected and fixed to the tail end of the intramedullary nail; then, by adjusting the direction of the sleeve and locking the ball head with the locking member, the connecting rod and the sleeve are fixed together, and the intramedullary nail can be removed. The operation is convenient, the operation time is short, and the risk of surgical bleeding and infection is effectively reduced.

[0008] In some embodiments, the locking element is a push rod, which is axially disposed in the sleeve and the tail end of the push rod extends out of the tail end of the sleeve. The head end of the push rod is used to press the ball head, and the push rod is threadedly engaged with the sleeve.

[0009] In some embodiments, the push rod has a concave spherical surface at its head end that mates with the ball head.

[0010] In some embodiments, the sleeve is provided with an internal thread, and the push rod is provided with an external thread. The internal thread is located at the tail end or the middle of the sleeve, and correspondingly, the external thread is located at the tail end or the middle of the push rod.

[0011] In some embodiments, the inner surface of the top end of the sleeve is a concave arc surface adapted to the ball head, and the thickness of the top end of the sleeve gradually decreases from its root to the edge of the perforation.

[0012] In some embodiments, the ball head is connected to the middle body portion of the connecting rod by a transition connecting section, the transition connecting section passing through the through hole, the radial dimension of the transition connecting section being smaller than the radial dimension of the middle body portion, and a shoulder being formed between the transition connecting section and the middle body portion.

[0013] In some embodiments, the intermediate main body has opposing planes for connecting to locking wrenches.

[0014] In some embodiments, the head end of the connecting rod is provided with a guide post and a threaded post, the guide post being located at the front end of the threaded post, and the threaded post being used for fixed connection with the threaded hole at the tail end of the intramedullary nail.

[0015] In some embodiments, the sleeve is provided with a protruding ring portion for blocking the sliding hammer.

[0016] In some embodiments, the convex ring portion is located at the tail end of the sleeve.

[0017] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0019] Figure 1 This is a schematic diagram of the intramedullary nail removal device of this utility model;

[0020] Figure 2 This is a cross-sectional view of the intramedullary nail removal device of this utility model in the locked state;

[0021] Figure 3 This is a cross-sectional view of the intramedullary nail remover of this utility model in its released state;

[0022] Figure 4 This is a schematic diagram of the connecting rod of the intramedullary nail removal device of this utility model;

[0023] Figure 5 This is a schematic diagram of the sleeve of the intramedullary nail removal device of this utility model;

[0024] Figure 6 This is a schematic diagram of a reversed state of the intramedullary nail removal device of this utility model.

[0025] Figure label:

[0026] Connecting rod 1; ball head 101; transition connecting section 102; annular groove 1021; intermediate main body 103; plane 1031; threaded post 104; guide post 105; sleeve 2; through hole 201; concave arc surface 202; convex arc surface 203; convex ring part 204; locking part 3; concave spherical surface 301. Detailed Implementation

[0027] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0028] The following is combined Figures 1 to 6 This invention describes an intramedullary nail removal device according to an embodiment of the present invention.

[0029] like Figures 1 to 6As shown, the intramedullary nail extractor according to an embodiment of the present invention includes a connecting rod 1, a sleeve 2, and a locking member 3. The head end of the connecting rod 1 is used to connect to the tail end of the intramedullary nail, and the tail end of the connecting rod 1 is provided with a ball head 101. The tail end of the connecting rod 1 passes through a perforation 201 on the top of the head end of the sleeve 2, with the ball head 101 located inside the head end of the sleeve 2. The locking member 3 is used to lock the ball head 101 to fix the connecting rod 1 to the sleeve 2, and to release the ball head 101 so that the ball head 101 can rotate arbitrarily to adjust the direction of the connecting rod 1 relative to the sleeve 2.

[0030] In this embodiment of the intramedullary nail extractor, during use, the ball head 101 is released by the locking member 3, allowing the ball head 101 to rotate in any direction. This facilitates adjustment of the direction of the connecting rod 1 relative to the sleeve 2, matching the direction of the connecting rod 1 with the direction of the intramedullary nail. The connecting rod 1 is then connected and fixed to the tail end of the intramedullary nail. Next, the direction of the sleeve 2 is adjusted, and the ball head 101 is locked by the locking member 3, fixing the connecting rod 1 to the sleeve 2. Finally, the sliding hammer is connected to the sleeve 2 to pull out the intramedullary nail.

[0031] The intramedullary nail extractor of this invention has the following advantages: it does not require enlarging the surgical incision; by adjusting the direction of the connecting rod 1, it can be accurately connected and fixed to the tail end of the intramedullary nail; then, by adjusting the direction of the sleeve 2 and locking the ball head 101 with the locking member 3, the connecting rod 1 and the sleeve 2 are fixed, and the intramedullary nail can be removed. The operation is convenient, the operation time is short, and the risk of surgical bleeding and infection is effectively reduced.

[0032] In some embodiments, the locking element 3 is a push rod, which is axially disposed in the sleeve 2 with its tail end extending beyond the tail end of the sleeve 2. The head end of the push rod is used to press against the ball head 101, and the push rod is threadedly engaged with the sleeve 2. When it is necessary to lock the ball head 101, the push rod is screwed in towards the head end of the sleeve 2, thereby pressing against the ball head 101. When it is necessary to release the ball head 101, the push rod is screwed out towards the tail end of the sleeve 2, thereby separating the push rod from the ball head 101. At this time, the ball head 101 can rotate in any direction within the head end of the sleeve 2.

[0033] In some embodiments, the push rod has a concave spherical surface 301 at its tip that mates with the ball head 101. This allows the push rod to better wrap around the ball head 101, thereby reliably pressing the ball head 101.

[0034] In some embodiments, the sleeve 2 is provided with an internal thread, and the push rod is provided with an external thread. The internal thread is located at the tail end or middle of the sleeve 2, and correspondingly, the external thread is located at the tail end or middle of the push rod. Through the engagement of the internal thread of the sleeve 2 and the external thread of the push rod, the axial forward and axial backward movement of the push rod can be easily realized, so as to lock and release the ball head 101 by the push rod.

[0035] In some embodiments, the inner surface of the top end of the sleeve 2 is a concave arc surface 202 adapted to the ball head 101, and the outer surface of the top end of the sleeve 2 is a convex arc surface 203. The thickness of the top end of the sleeve 2 gradually decreases from its root to the edge of the perforation 201. This facilitates the directional adjustment of the connecting rod 1 and avoids interference between the connecting rod 1 and the sleeve 2.

[0036] In some embodiments, the ball head 101 is connected to the middle body portion 103 of the connecting rod 1 via a transition connecting section 102. The transition connecting section 102 passes through the through hole 201, and the radial dimension of the transition connecting section 102 is smaller than the radial dimension of the middle body portion 103. The ball head 101, the transition connecting section 102, and the middle body portion 103 together form an annular groove 1021, and the top of the head end of the sleeve 2 is confined within the annular groove 1021. This facilitates the directional adjustment of the connecting rod 1.

[0037] In some embodiments, the intermediate main body 103 is provided with opposing planes 1031 for connecting to a locking wrench. By providing the planes 1031 on the intermediate main body 103, it is convenient to connect the connecting rod 1 to the locking wrench, and the connecting rod 1 can be easily connected to the intramedullary nail by operating the locking wrench.

[0038] In some embodiments, the head end of the connecting rod 1 is provided with a guide post 105 and a threaded post 104. The guide post 105 is located at the front end of the threaded post 104, and the threaded post 104 is used for fixed connection with the threaded hole at the tail end of the intramedullary nail. By providing the guide post 105, it can be ensured that the threaded post 104 is accurately connected to the threaded hole at the tail end of the intramedullary nail, and misalignment and jamming of the threads of the threaded post 104 and the threaded hole at the tail end of the intramedullary nail can be avoided.

[0039] Preferably, the head end of the guide post 105 is tapered.

[0040] In some embodiments, the sleeve 2 is provided with a protruding ring portion 204 for blocking the sliding hammer. In use, the sliding hammer engages with the sleeve 2 and abuts against the front end face of the protruding ring portion 204, and the intramedullary nail is pulled out by operating the sliding hammer.

[0041] In some embodiments, the protruding ring 204 is located at the tail end of the sleeve 2, and the position of the protruding ring 204 is reasonably set.

[0042] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0043] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. An intramedullary nail extractor, characterized in that, The connecting rod is connected with the tail end of the intramedullary nail, the tail end of the connecting rod is provided with a ball head, the tail end of the connecting rod passes through a through hole on the top of the head end of the sleeve and the ball head is located in the head end of the sleeve, the locking member is used for locking the ball head to fix the connecting rod and the sleeve and releasing the ball head to make the ball head rotate randomly to adjust the direction of the connecting rod relative to the sleeve.

2. The intramedullary nail extractor according to claim 1, wherein, The locking member is a push rod, the push rod is axially arranged in the sleeve and the tail end of the push rod extends out of the tail end of the sleeve, the head end of the push rod is used for pressing the ball head, and the push rod is threadedly connected with the sleeve.

3. The intramedullary nail extractor according to claim 2, wherein, The head end of the push rod is provided with a concave spherical surface matched with the ball head.

4. The intramedullary nail extractor of claim 2, wherein, The sleeve is provided with an internal thread, the push rod is provided with an external thread, the internal thread is located at the tail end or the middle part of the sleeve, and the external thread is correspondingly located at the tail end or the middle part of the push rod.

5. The intramedullary nail extractor of Claim 1, wherein, The inner surface of the top of the head end of the sleeve is a concave arc surface matched with the ball head, and the thickness of the top of the head end of the sleeve gradually decreases from the root thereof to the edge of the through hole.

6. The intramedullary nail extractor of any of claims 1-5, wherein, The ball head and the middle main body part of the connecting rod are connected through a transition connecting section, the transition connecting section passes through the through hole, the radial dimension of the transition connecting section is smaller than that of the middle main body part, and a shoulder is formed between the transition connecting section and the middle main body part.

7. The intramedullary nail extractor of claim 6, wherein, The middle main body part is provided with planes opposite to each other for connecting a locking wrench.

8. The intramedullary nail extractor of any of claims 1-5, wherein, The head end of the connecting rod is provided with a guide column and a threaded column, the guide column is located at the front end of the threaded column, and the threaded column is used for fixedly connecting with the threaded hole of the tail end of the intramedullary nail.

9. The intramedullary nail extractor of any of claims 1-5, wherein, The sleeve is provided with a convex ring part for blocking a slide hammer.

10. The intramedullary nail extractor of Claim 9, wherein, The convex ring part is located at the tail end of the sleeve.

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