Intramedullary nail extractor

Abstract

The utility model relates to an intramedullary nail extractor which comprises a nail extractor body, an expansion control piece and an expansion piece, the expansion piece is arranged at one end of the nail extractor body, and a nail pulling structure used for pulling an intramedullary nail is arranged at the other end of the nail extractor body. The expansion piece can expand to clamp the inner wall of the intramedullary nail, and the expansion control piece controls expansion of the expansion piece. Under the control of the expansion control piece, the expansion piece expands to the position where the inner wall of the intramedullary nail is clamped, and stable connection between the nail taking device body and the intramedullary nail is achieved. The nail pulling structure is used for pulling the intramedullary nail; the hollow intramedullary nail extractor can be used for extracting hollow intramedullary nails of different parts, different manufacturers and different brands.

Description

Technical Field

[0001] The utility model relates to the field of intramedullary nails, in particular to an intramedullary nail extractor. Background Art

[0002] Fractures of the tubular bones of the extremities are common orthopedic diseases, mostly caused by traffic accidents, falls from heights and other accidents. After the tubular bone fractures, due to the traction of muscles, shortening and angulation displacement often occur. Non-surgical treatment is difficult to maintain good alignment and linearity of the tubular bone, so surgical treatment is required. Intramedullary nail internal fixation for the treatment of tubular bone fractures has the advantages of minimally invasive and axial fixation, can provide better biomechanical strength, and is commonly used clinically.

[0003] For fractures of the tubular bones of the long bones of the extremities, there are various brands and manufacturers of intramedullary nails for fractures in different parts. The inner diameters of the hollow intramedullary nails and the thread pitches of the tail nails in different parts are different. Therefore, when removing the intramedullary nail after fracture healing, different special extractors are often required to complete the removal of the intramedullary nail. In some clinical cases where the nail is removed many years after the operation, due to the update and replacement of the hollow intramedullary nails, it may be difficult to find the nail extractor originally supporting the intramedullary nail, and even the original manufacturer, brand and special instruments cannot be found. This often brings trouble to clinical work.

[0004] When removing the intramedullary nail after fracture healing, various problems leading to difficult nail removal are often encountered, including: the connecting threads at the tails of intramedullary nails of different manufacturers and brands in different parts are different (the pitch and diameter are inconsistent), the inner threads at the tail of the intramedullary nail are deformed and the threads are stripped when the tail locking nail is screwed in, or the connecting external threads of the extraction rod of the extractor are deformed due to repeated use, making it difficult to connect well with the threads at the tail of the intramedullary nail, and there is more osteophyte hyperplasia and scar formation around the tail of the intramedullary nail, etc., resulting in that the original factory-supplied extractor cannot be well connected with the threads at the tail of the intramedullary nail in the original direction. The above uncertain factors may lead to an extended operation time, increased bleeding, an increased infection rate, or adverse consequences such as iatrogenic fractures and the inability to smoothly remove the intramedullary nail. Content of the Utility Model

[0005] The purpose of the utility model is to overcome the deficiencies of the prior art and provide an intramedullary nail extractor, which can realize the extraction of hollow intramedullary nails in different parts, of different manufacturers and brands.

[0006] The purpose of the utility model is achieved by the following technical solutions:

[0007] The intramedullary nail extractor includes an extractor body, an expansion control member and an expansion member. The expansion member is arranged at one end of the extractor body, and a nail extraction structure for extracting the intramedullary nail is arranged at the other end of the extractor body; the expansion member can expand to clamp the inner wall of the intramedullary nail, and the expansion control member controls the expansion of the expansion member.

[0008] Furthermore, the expansion member is an expansion outer sheath which is sleeved outside the nail extractor body; a plurality of expansion parts are arranged at one end of the expansion outer sheath, a conical expander is arranged at one end of the nail extractor body close to the expansion member, and the expansion outer sheath moves towards the conical expander under the control of the expansion control member so that the expansion parts expand outwards under the action of the conical expander.

[0009] Furthermore, the conical expander is trumpet-shaped.

[0010] Furthermore, the expansion control member is arranged above the expansion outer sheath, the expansion control member is provided with a through hole, the nail extractor body passes through the through hole, an external thread is arranged on the outer wall of the nail extractor body, and an internal thread matching the external thread is arranged in the through hole.

[0011] Furthermore, the distance between the lower edge of the external thread and the bottom of the conical expander is less than the distance between the top of the expansion outer sheath and the bottom of the expansion part.

[0012] Furthermore, the expansion control member is a hexagonal nut.

[0013] Furthermore, the nail extractor body is a driving and extracting rod.

[0014] Furthermore, the nail pulling structure includes a sliding hammer and a limiting member; the sliding hammer is sleeved outside the nail extractor body, and the limiting member is detachably connected to the end of the nail extractor body.

[0015] Furthermore, the limiting member is screwed to the end of the nail extractor body.

[0016] Furthermore, the limiting member is a large head screw or a large head nut.

[0017] The beneficial effects of the utility model are as follows:

[0018] Under the control of the expansion control member, the expansion member expands to clamp the inner wall of the intramedullary nail, realizing the firm connection between the nail extractor body and the intramedullary nail; the intramedullary nail is pulled out by the nail pulling structure; the extraction of the hollow intramedullary nails at different parts, different manufacturers and brands can be realized. Description of the Drawings

[0019] Figure 1 is a schematic structural diagram of the utility model;

[0020] Figure 2 is Figure 1 the enlarged view at A in

[0021] Figure 3 is a schematic structural diagram of the nail extractor body;

[0022] Figure 4 is a schematic structural diagram of the expansion outer sheath;

[0023] Figure 5 Schematic structural diagram of the expansion control member;

[0024] Figure 6 Schematic structural diagram of the sliding hammer.

[0025] In the figure, 1 - nail extractor body, 2 - expansion outer sheath, 3 - conical expander, 4 - expansion part, 5 - expansion control member, 6 - sliding hammer, 7 - limiting member, 8 - external thread, 9 - internal thread. Specific embodiments

[0026] The following uses specific examples to illustrate the implementation manners of the present utility model. Those skilled in the art can easily understand other advantages and effects of the present utility model from the content disclosed in this specification. The present utility model can also be implemented or applied through other different specific implementation manners. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present utility model. It should be noted that, without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0027] It should be noted that the diagrams provided in the following embodiments only illustrate the basic concept of the present utility model in a schematic manner. Therefore, only the components related to the present utility model are shown in the diagrams, rather than being drawn according to the number, shape, and size of the components in actual implementation. The types, quantities, and ratios of the components in actual implementation can be arbitrarily changed, and the component layout type may also be more complex.

[0028] Embodiment 1:

[0029] As Figures 1 to 6 shown, an intramedullary nail extractor includes a nail extractor body 1, an expansion control member 5, and an expansion member. The expansion member is provided at one end of the nail extractor body 1, and a nail extraction structure for extracting the intramedullary nail is provided at the other end of the nail extractor body 1; the expansion member can expand to clamp the inner wall of the intramedullary nail, and the expansion control member 5 controls the expansion of the expansion member.

[0030] Under the control of the expansion control member 5, the expansion member expands to clamp the inner wall of the intramedullary nail, realizing the firm connection between the nail extractor body 1 and the intramedullary nail; the intramedullary nail is extracted through the nail extraction structure; the extraction of the hollow intramedullary nails at different parts, different manufacturers, and brands can be realized.

[0031] The expansion member is an expansion outer sheath 2, and the expansion outer sheath 2 is sleeved outside the nail extractor body 1; a plurality of expansion parts 4 are provided at one end of the expansion outer sheath 2, a conical expander 3 is provided at the end of the nail extractor body 1 close to the expansion member, and the expansion outer sheath 2 moves towards the conical expander 3 under the control of the expansion control member 5, so that the expansion parts 4 expand outwards under the action of the conical expander 3.

[0032] The conical expander 3 is trumpet-shaped.

[0033] The expansion control member 5 is provided above the expansion outer sheath 2. The expansion control member 5 is provided with a through hole. The nail extractor body 1 passes through the through hole. An external thread 8 is provided on the outer wall of the nail extractor body 1, and an internal thread 9 matching the external thread 8 is provided in the through hole.

[0034] The distance between the lower edge of the external thread 8 and the bottom of the conical expander 3 is less than the distance between the top of the expansion outer sheath 2 and the bottom of the expansion part 4.

[0035] The external thread 8 is provided at the lower one-third of the driving and extracting rod, and the lower edge of the external thread 8 is continuous with the conical expander 3.

[0036] The expansion control member 5 is a hexagonal nut.

[0037] [[ID=1⑥]]The nail extractor body 1 is a driving and extracting rod.

[0038] The nail extraction structure includes a sliding hammer 6 and a limiting member 7; the sliding hammer 6 is sleeved outside the nail extractor body 1, and the limiting member 7 is detachably connected to the end of the nail extractor body 1.

[0039] The limiting member 7 is screwed to the end of the nail extractor body 1.

[0040] The limiting member 7 is a large-headed screw or a large-headed nut.

[0041] The sliding hammer 6 removes the intramedullary nail connected to the driving and extracting rod and the expansion outer sheath 2 by hammering the large-headed screw outward. The sliding hammer 6 can pull out the entire intramedullary nail through the nail extractor body 1 by the coaxial outward sliding driving and extracting force.

[0042] The outer diameter of the expansion outer sheath 2 is smaller than the inner diameter of the intramedullary nail, and the outer diameter of the expansion outer sheath 2 has different sizes.

[0043] The driving and extracting rod is connected to the expansion outer sheath 2 with different outer diameters, so as to determine the expansion pressure locking of intramedullary nails with different inner diameters. The expansion pressure is tightened through the external thread 8 and the expansion control member 5; it is suitable for intramedullary nails with different hollow inner diameters, including femoral intramedullary nails, tibial intramedullary nails, humeral intramedullary nails, etc.

[0044] The outer diameter of the expander before expansion is smaller than the inner diameter of the intramedullary nail. The nail extractor body 1 and the expander can be directly inserted into the hollow intramedullary nail. The intramedullary nail is clamped by the expander for driving and extracting the nail, which has more extensive clinical practicability.

[0045] Usage method:

[0046] 1. Connection:

[0047] 1) Insert the staple remover body 1 into the hollow intramedullary nail, and sleeve the expansion outer sheath 2 with a suitable diameter between the staple remover body 1 and the hollow intramedullary nail;

[0048] 2) Screw in the expansion control member 5. After tightening the expansion control member 5, the expansion portion 4 of the expansion outer sheath 2 expands outward under the action of the conical expander 3 until it clamps the inner wall of the intramedullary nail;

[0049] 3) Sleeve the sliding hammer 6 onto the extraction rod;

[0050] 4) Tighten the limiting member 7 at the end of the extraction rod.

[0051] 2. Extraction: Use the sliding hammer 6 to extract the limiting member 7 outward, and extract the extraction rod, the expansion outer sheath 2 and the hollow intramedullary nail out of the tubular bone together; the nail removal is completed.

[0052] Directly insert the staple remover body 1 and the expansion outer sheath 2 into the hollow intramedullary nail, and statically press the expansion portion 4 of the expansion outer sheath 2 against the inner wall of the intramedullary nail by tightening the expansion control member 5. The advantage of this is that there is no need to consider the manufacturer, shape, or whether the internal thread 9 of the hollow intramedullary nail is stripped. It can be directly inserted into the hollow intramedullary nails of different parts, manufacturers, and brands. In theory, it can be applied to the nail removal of common hollow intramedullary nails in the extremities. At the same time, the slightly smaller diameter of the staple remover body 1 makes it easier to enter the hollow intramedullary nail and then expand and press. This ensures the consistency of the contact surface and the force line of the connection.

[0053] The above-described embodiments only represent the specific implementation manners of the present utility model, and the description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent of the present utility model. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present utility model, several modifications and improvements can still be made, and these all belong to the protection scope of the present utility model.

Claims

1. Intramedullary nail extractor, characterized by: It includes a nail extractor body, an expansion control member, and an expansion member. The expansion member is provided at one end of the nail extractor body, and a nail extraction structure for extracting the intramedullary nail is provided at the other end of the nail extractor body; the expansion member can expand to clamp the inner wall of the intramedullary nail, and the expansion control member controls the expansion of the expansion member.

2. The intramedullary nail extractor according to claim 1, characterized in that: The expansion member is an expansion outer sheath, and the expansion outer sheath is sleeved outside the nail extractor body; a plurality of expansion portions are provided at one end of the expansion outer sheath, and a conical expander is provided at one end of the nail extractor body near the expansion member. The expansion outer sheath moves towards the conical expander under the control of the expansion control member, so that the expansion portions expand outwards under the action of the conical expander.

3. The intramedullary nail extractor according to claim 2, characterized in that: The conical expander is trumpet-shaped.

4. The intramedullary nail extractor according to claim 2, wherein: The expansion control member is provided above the expansion outer sheath. The expansion control member is provided with a through hole, and the nail extractor body passes through the through hole. An external thread is provided on the outer wall of the nail extractor body, and an internal thread matching the external thread is provided in the through hole.

5. The intramedullary nail extractor according to claim 4, wherein: The distance between the lower edge of the external thread and the bottom of the conical expander is less than the distance between the top of the expansion outer sheath and the bottom of the expansion portion.

6. The intramedullary nail extractor according to claim 4, wherein: The expansion control member is a hexagonal nut.

7. The intramedullary nail extractor according to claim 1, wherein: The nail extractor body is a driving and extracting rod.

8. The intramedullary nail extractor according to claim 1, wherein: The nail extraction structure includes a sliding hammer and a limiting member; the sliding hammer is sleeved outside the nail extractor body, and the limiting member is detachably connected to the end of the nail extractor body.

9. The intramedullary nail extractor according to claim 8, characterized in that: The limiting member is screwed to the end of the nail extractor body.

10. The intramedullary nail extractor according to claim 9, characterized in that: The limiting member is a large-headed screw or a large-headed nut.

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