A segmented intramedullary nail main nail

Abstract

The present invention discloses a segmented intramedullary nail main nail. The segmented intramedullary nail main nail comprises: a distal main nail, a first connection portion is provided at its proximal end; a proximal main nail, a second connection portion is provided at its distal end, and the second connection portion can be sleeved on the first connection portion; a quick-install component is arranged on the proximal main nail and can connect the first connection portion and the second connection portion; the quick-install component comprises: a moving part, which is sleeve-shaped and sleeved on the second connection portion, and the moving part can move axially relative to the second connection portion along the proximal main nail; a return part, which is arranged on the second connection portion and can push the moving part to move toward the distal main nail; a connecting part, which is arranged on the second connection portion and can slide radially along the second connection portion, and the connecting part can be clamped on the first connection portion under the push of the moving part. The segmented intramedullary nail main nail of the present invention can realize the segmented implantation of the main nail into the medullary cavity, can reduce the deformation of the overall main nail, and is conducive to the accurate installation of the locking nail.

Description

Technical Field

[0001] The invention belongs to the technical field of orthopedic implants, and in particular relates to a segmented intramedullary nail main nail. Background Art

[0002] An intramedullary nail is an internal fixation device inside the human bone marrow cavity and is a commonly used medical device for treating fractures. The intramedullary nail includes a main nail and a locking nail, and screw holes are provided at both ends of the main nail. After the main nail is implanted into the intramedullary cavity, two locking nails are required to lock the two ends of the main nail on the bone respectively. When implanting the main nail, an opening needs to be made at one end of the bone, and then the intramedullary nail is implanted into the medullary cavity through the opening through surgical instruments. However, external force is required to impact the intramedullary nail axially during implantation, and due to the long length of the main nail, deformation is easily caused when the main nail is driven into the intramedullary nail, resulting in inaccurate distal positioning of the main nail, and the locking nail cannot be accurately screwed into the distal hole. Summary of the invention

[0003] In order to solve the above technical problems, the present invention provides a segmented intramedullary nail main nail, which can solve the problems in the prior art that the main nail is easily deformed when implanted into the medullary cavity and the locking nail cannot be accurately screwed into the distal hole.

[0004] A segmented intramedullary nail main nail, comprising:

[0005] A distal main nail, wherein the proximal end of the distal main nail is provided with a first connecting portion;

[0006] A proximal main nail, wherein the distal end of the proximal main nail is provided with a second connecting portion, and the second connecting portion can be sleeved on the first connecting portion;

[0007] A quick-install component, which is disposed on the proximal main nail and can connect the first connecting portion and the second connecting portion;

[0008] The quick-install components include:

[0009] A moving member, which is sleeve-shaped and sleeved on the second connecting portion, and the moving member can move relative to the second connecting portion along the axial direction of the proximal main nail;

[0010] a return member, which is disposed on the second connecting portion and is capable of pushing the moving member to move toward the distal main nail;

[0011] The connecting member is arranged on the second connecting portion and can slide along the radial direction of the second connecting portion. The connecting member can be clamped on the first connecting portion under the push of the moving member.

[0012] Preferably, in the above technical solution, a connecting hole is formed in the second connecting portion along the axial direction of the proximal main nail, and the first connecting portion can extend into the connecting hole and be connected to the second connecting portion through the connecting piece.

[0013] Preferably, the connecting member is a ball, a limiting hole is provided on the side wall of the second connecting part, the axis of the limiting hole is perpendicular to the axis of the second connecting part, the ball can enter and exit the limiting hole from one end of the limiting hole away from the connecting hole, and the end of the limiting hole close to the connecting hole can limit the ball from escaping from the limiting hole from this end.

[0014] Preferably, the inner wall of one end of the movable member close to the distal main nail is a trumpet-shaped structure, and the inner diameter of the trumpet-shaped structure close to the distal main nail is larger than the inner diameter away from the distal main nail. During the connection process of the first connecting part and the second connecting part, an accommodating space can be provided for the connecting part that is not connected to the first connecting part, and the connecting part can be continuously pressed against the first connecting part.

[0015] Preferably, the horn-shaped structure comprises a conical surface, an arc surface and a cylindrical surface which are sequentially connected from the proximal end to the distal end.

[0016] Preferably, the above technical solution is provided with a slot on the first connecting portion, the inner wall of the slot is a spherical surface and can fit with the surface of the connecting piece, and when the slot is opposite to the limiting hole and the connecting piece is installed at the same time, the distal main nail and the proximal main nail are connected to form the intramedullary nail main nail.

[0017] The above technical solution is preferred, wherein two symmetrical sliding grooves are provided on the side wall of the second connecting portion, and two symmetrical limiting members are provided on the moving member, and the two limiting members protrude from the inner wall of the moving member and can extend into the connecting hole through the two sliding grooves respectively.

[0018] Preferably, the proximal end of the connecting hole is formed with a step surface, and the return member is arranged in the connecting hole and sandwiched between the step surface and the limiting member.

[0019] Preferably, the above technical solution is that the limiting member is a top screw fixed on the moving member.

[0020] Preferably, the return member is a spring.

[0021] The advantages and positive effects of the present invention are as follows: the segmented intramedullary nail main nail provided by the present invention comprises a distal main nail, a proximal main nail and a quick-install component, the quick-install component comprises a moving part, a restoring part and a connecting part, when the distal main nail is inserted into the proximal main nail, the connecting part is lifted to push the moving part to move proximally, after the connecting part is clamped into the first connecting part, the moving part moves distally under the action of the restoring part to clamp the outer surface of the connecting part, the operator only needs to perform a simple insertion to complete the connection between the distal main nail and the proximal main nail, the operation is convenient, and the segmented implantation of the main nail into the medullary cavity can be realized, since the length of the main nail implanted each time is shortened, the deformation of the overall main nail can be reduced, which is conducive to the accurate installation of the locking nail. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic structural diagram of a segmented intramedullary nail main nail provided in an embodiment of the present invention;

[0023] Figure 2 yes Figure 1 A partial enlarged view of the middle A;

[0024] Figure 3 yes Figure 2 A partial enlarged view of point B in the middle;

[0025] Figure 4 It is a schematic diagram of the position relationship between the slot and the limiting hole after the proximal main nail and the distal main nail are connected.

[0026] Among them: 1. Distal main nail; 2. Proximal main nail; 3. Quick-install components;

[0027] 11. first connecting part; 21. second connecting part; 22. first through hole; 31. moving part; 32. restoring part; 33. connecting part; 34. trumpet-shaped structure; 35. limiting part;

[0028] 111, slot; 211, connecting hole; 212, slide groove; 213, limiting hole; 2131, first hole; 2132, second hole; 341, conical surface; 342, arc surface; 343, cylindrical surface. DETAILED DESCRIPTION

[0029] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0030] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0031] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0032] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0033] In order to solve the problem in the prior art that the main nail of the intramedullary nail is long and is easily deformed when being driven into the main nail of the intramedullary nail, thereby causing inaccurate distal positioning and the locking nail being unable to be accurately screwed into the distal hole, the present embodiment provides a segmented main nail of the intramedullary nail, such as Figure 1 and Figure 2As shown, the segmented intramedullary nail main nail includes a distal main nail 1, a proximal main nail 2 and a quick-install component 3, wherein the distal main nail 1 is used to be implanted in the distal end of the medullary cavity, the proximal main nail 2 is used to be implanted in the proximal end of the medullary cavity, and the quick-install component 3 is used to achieve the connection between the distal main nail 1 and the proximal main nail 2, and to achieve quick installation. The proximal end of the distal main nail 1 is provided with a first connecting portion 11; the distal end of the proximal main nail 2 is provided with a second connecting portion 21, and the first connecting portion 11 and the second connecting portion 21 are connected through the quick-install component 3; the quick-install component 3 can be arranged on the first connecting portion 11 or the second connecting portion 21, and the quick-install component 3 is preferably arranged on the second connecting portion 21 of the proximal main nail 2 in this embodiment. The quick-release component 3 includes a moving part 31, a restoring part 32 and a connecting part 33. The moving part 31 is sleeve-shaped and is sleeved on the second connecting part 21. The moving part 31 can move axially along the proximal main nail 2 relative to the second connecting part 21; the restoring part 32 is arranged on the second connecting part 21 and can push the moving part 31 to move toward the distal main nail 1; the connecting part 33 is arranged on the second connecting part 21 and can slide radially along the second connecting part 21. The connecting part 33 can be clamped on the first connecting part 11 under the push of the moving part 31. When the distal main nail 1 is inserted into the proximal main nail 2, the connecting piece 33 is lifted up and pushes the moving piece 31 to move proximally. After the connecting piece 33 is clamped into the first connecting part 11, the moving piece 31 moves distally under the action of the return piece 32 and clamps the outer surface of the connecting piece 33. The operator only needs to perform a simple insertion to complete the connection between the distal main nail 1 and the proximal main nail 2. The operation is convenient, and the segmented implantation of the intramedullary nail main nail into the medullary cavity can be realized, which can reduce the deformation of the overall intramedullary nail main nail and is conducive to the accurate installation of the locking nail.

[0034] In this embodiment, the moving member 31 is sleeve-shaped, and the inner wall of one end close to the distal main nail 1 is a trumpet-shaped structure 34. The inner diameter of the trumpet-shaped structure 34 close to the distal main nail 1 is larger than the inner diameter away from the distal main nail 1. During the connection process between the first connecting portion 11 and the second connecting portion 21, it can provide an accommodating space for the connecting member 33 not connected to the first connecting portion 11, and can also continuously press the connecting member 33 on the first connecting portion 11. The trumpet-shaped structure 34 includes a conical surface 341, an arc surface 342, and a cylindrical surface 343 connected in sequence from the proximal end to the distal end.

[0035] In this embodiment, the connecting member 33 is a ball. A limiting hole 213 is provided on the side wall of the second connecting portion 21. The axis of the limiting hole 213 is perpendicular to the axis of the second connecting portion 21. The ball can enter and exit the limiting hole 213 from the end of the limiting hole 213 away from the connecting hole 211, and the end of the limiting hole 213 close to the connecting hole 211 can prevent the ball from escaping from the limiting hole 213. Figure 3 and Figure 4As shown, the specific limiting hole 213 is a stepped hole, which includes a first hole 2131 and a second hole 2132. The first hole 2131 is a cylindrical hole, and the inner wall of the second hole 2132 is a partial spherical surface. The diameter of the first hole 2131 is greater than the maximum diameter of the second hole 2132 and greater than or equal to the diameter of the ball. The second hole 2132 is connected to the connecting hole 211, and the first hole 2131 is arranged at an end away from the connecting hole 211. The curvature radius of the second hole 2132 is smaller than the radius of the ball, so that the second hole 2132 can limit the ball from escaping from the limiting hole 213 in the direction of the connecting hole 211.

[0036] The first connecting part 11 is provided with a slot 111, the inner wall of the slot 111 is spherical, the connecting member 33 can be partially inserted into the slot 111 under the pressure of the trumpet-shaped structure 34 of the moving member 31, the surface of the connecting member 33 is in contact with the inner wall of the slot 111, and the proximal main nail 2 is connected with the distal main nail 1. The number of the slot 111 and the limiting hole 213 are both one, and when the slot 111 is opposite to the limiting hole 213 and the connecting member 33 is inserted at the same time, the distal main nail 1 and the proximal main nail 2 are connected as the intramedullary nail main nail, which can avoid the connection dislocation of the distal main nail 1 and the proximal main nail 2, and can ensure that the overall appearance of the intramedullary nail main nail meets the design requirements.

[0037] The return member 32 can be a spring, a hydraulic rod or a pneumatic rod, etc. In this embodiment, a spring is selected.

[0038] The second connecting part 21 is provided with a connecting hole 211 along the axial direction of the proximal main nail 2, and the first connecting part 11 can extend into the connecting hole 211 and be connected to the second connecting part 21 through the connecting member 33. Two symmetrical slide grooves 212 are provided on the side wall of the second connecting part 21, and two symmetrical limit members 35 are provided on the moving member 31. The two limit members 35 protrude from the inner wall of the moving member 31 and can extend into the connecting hole 211 through the two slide grooves 212 respectively. Specifically, the limit members 35 are top screws fixed on the moving member 31. The top screw is passed through the moving member 31. The top screw can be connected to the side wall of the moving member 31 by welding or threading.

[0039] A step surface is formed at the proximal end of the connecting hole 211, and the return member 32 is arranged in the connecting hole 211 and clamped between the step surface and the stop member 35. The proximal main nail 2 is provided with a first through hole 22 along the axial direction of the proximal main nail 2 for cooperating with the surgical instrument. The first through hole 22 is connected to the connecting hole 211, and the inner diameter of the connecting hole 211 is larger than the inner diameter of the first through hole 22, so that the above-mentioned step surface is formed at the end where the connecting hole 211 is connected to the first through hole 22. In this embodiment, one end of the spring is pressed against the step surface, and the other end is pressed against the top screw.

[0040] In this embodiment, the diameter of the ball is greater than the first size and less than or equal to the second size, wherein the first size refers to the maximum distance from the inner wall of the moving part 31 to the outer wall of the second connecting part 21, and the second size refers to the sum of the first size and the side wall thickness of the second connecting part 21.

[0041] The working process of this embodiment is as follows: during surgery, the distal main nail 1 is first matched with the instrument and implanted into the medullary cavity; then the proximal main nail 2 is matched with the instrument and implanted into the medullary cavity, and connected to the distal main nail 1. The connection with the distal main nail 1 is specifically to sleeve the second connecting part on the first connecting part 11. During this process, the first connecting part 11 lifts the ball, and the ball is lifted and contacts the arc surface 342 and pushes the moving part 31 to slide proximally relative to the second connecting part 21. The top screw compresses the spring, and by adjusting the angle of the proximal main nail 2, when the ball falls into the slot 111, the ball no longer moves, and the pushing force of the ball on the moving part 31 disappears. Under the action of the spring elastic force, the moving part 31 moves in the direction close to the distal main nail 1, pressing the ball against the slot 111, thereby realizing the connection between the proximal main nail 2 and the distal main nail 1. The proximal main nail 2 and the distal main nail 1 of the segmented intramedullary nail main nail in this embodiment can not only achieve quick connection, but also reduce deformation during surgical implantation, thereby ensuring accurate installation of the locking nail.

[0042] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A segmented intramedullary nail main nail, It is characterized in that include: A distal main nail (1), wherein a first connecting portion (11) is provided at the proximal end of the distal main nail (1); A proximal main nail (2), wherein a second connecting portion (21) is provided at the distal end of the proximal main nail (2), and the second connecting portion (21) can be sleeved on the first connecting portion (11); A quick-install component (3), which is arranged on the proximal main nail (2) and is capable of connecting the first connecting portion (11) and the second connecting portion (21); The quick-install component (3) comprises: A moving member (31) which is sleeve-shaped and sleeved on the second connecting portion (21), wherein the moving member (31) can move relative to the second connecting portion (21) along the axial direction of the proximal main nail (2); a return member (32), which is arranged on the second connecting portion (21) and is capable of pushing the moving member (31) to move toward the distal main nail (1); a connecting member (33) which is arranged on the second connecting portion (21) and is capable of sliding along the radial direction of the second connecting portion (21); the connecting member (33) is capable of being clamped on the first connecting portion (11) under the push of the moving member (31); The inner wall of one end of the moving member (31) close to the distal main nail (1) is a trumpet-shaped structure (34), and the inner diameter of the trumpet-shaped structure (34) close to the distal main nail (1) is larger than the inner diameter away from the distal main nail (1). During the connection process between the first connecting part (11) and the second connecting part (21), it is possible to provide an accommodation space for the connecting member (33) not connected to the first connecting part (11), and to continuously press the connecting member (33) against the first connecting part (11); The trumpet-shaped structure (34) comprises a conical surface (341), an arc surface (342) and a cylindrical surface (343) which are sequentially connected from the proximal end to the distal end.

2. The segmented intramedullary nail according to claim 1, Features: The second connecting portion (21) is provided with a connecting hole (211) along the axial direction of the proximal main nail (2), and the first connecting portion (11) can extend into the connecting hole (211) and be connected to the second connecting portion (21) via the connecting piece (33).

3. The segmented intramedullary nail according to claim 2, Features: The connecting member (33) is a ball bearing, and a limiting hole (213) is provided on the side wall of the second connecting portion (21), the axis of the limiting hole (213) is perpendicular to the axis of the second connecting portion (21), the ball bearing can enter and exit the limiting hole (213) from one end of the limiting hole (213) away from the connecting hole (211), and the end of the limiting hole (213) close to the connecting hole (211) can limit the ball bearing from escaping from the limiting hole (213) from this end.

4. The segmented intramedullary nail according to claim 3, Features: The first connecting portion (11) is provided with a slot (111), the inner wall of the slot (111) is spherical and can fit with the surface of the connecting piece (33); when the slot (111) is opposite to the limiting hole (213) and the connecting piece (33) is inserted at the same time, the distal main nail (1) and the proximal main nail (2) are connected to form the intramedullary nail main nail.

5. The segmented intramedullary nail according to claim 2, Features: Two symmetrical sliding grooves (212) are provided on the side wall of the second connecting portion (21), and two symmetrical limiting members (35) are provided on the moving member (31). The two limiting members (35) protrude from the inner wall of the moving member (31) and can extend into the connecting hole (211) through the two sliding grooves (212) respectively.

6. The segmented intramedullary nail according to claim 5, Features: A step surface is formed at the proximal end of the connection hole (211), and the return member (32) is arranged in the connection hole (211) and sandwiched between the step surface and the limiting member (35).

7. The segmented intramedullary nail according to claim 5, Features: The limiting member (35) is a top screw fixed on the moving member (31).

8. The segmented intramedullary nail according to claim 1, Features: The return member (32) is a spring.

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