CN117814894A

CN117814894A - Self-locking needle

Info

Publication number: CN117814894A
Application number: CN202410087878.7A
Authority: CN
Inventors: 潘振宇
Original assignee: Zhongnan Hospital of Wuhan University
Current assignee: Zhongnan Hospital of Wuhan University
Priority date: 2024-01-22
Filing date: 2024-01-22
Publication date: 2024-04-05

Abstract

The invention relates to the technical field of medical instruments, in particular to a self-locking needle. The self-locking needle comprises an inner needle and an outer needle, wherein one end of the inner needle is provided with a tip, the outer needle is a hollow needle body, the hollow needle body is sleeved outside the inner needle, the outer surface of the outer needle, which corresponds to one end part of the tip, is provided with self-locking threads, and the outer needle and the inner needle are locked or unlocked through a locking structure. The advantages are that: the structure design is simple and reasonable, the structural strength of the whole self-locking needle can be ensured, the fracture is difficult to occur, and meanwhile, the bone self-locking needle can be effectively coupled and fixed with the bone block, so that the subsequent bone block can be reset smoothly.

Description

Self-locking needle

Technical Field

The invention relates to the technical field of medical instruments, in particular to a self-locking needle.

Background

The Kirschner wire is a common internal fixation instrument for orthopaedics, which is a relatively wide instrument applied clinically, is generally used for fixing short and small fracture or tear-off fracture and other fracture fixation with low stress, and is also used for fixing temporary fracture blocks or assisting in reduction of fracture in orthopaedics operation.

At present, the most clinically used Kirschner wire is a smooth straight needle body, and after the tip of the Kirschner wire is drilled into bones, the Kirschner wire and bones are not tightly coupled, so that the interface between the Kirschner wire and the bones is easy to loosen and easy to slide during operation.

In addition, there is also an improvement to have the screw thread k shi needle, through the screw thread brill bone for k shi needle and the firm coupling of bone, but because k shi needle diameter is less, the department of cutting at screw thread and k shi needle smooth surface juncture easily takes place when clinical use, has consequently restricted the popularization and use of this kind of k shi needle.

Based on this, a new needle body needs to be developed to solve the problems that the needle body is not firmly fixed with bones and is easy to fall off, and the existing kirschner wire with threads is easy to break.

Disclosure of Invention

The invention aims to provide a self-locking needle which effectively overcomes the defects of the prior art.

The technical scheme for solving the technical problems is as follows:

the self-locking needle comprises an inner needle and an outer needle, wherein one end of the inner needle is provided with a tip, the outer needle is a hollow needle body, the hollow needle body is sleeved outside the inner needle, the outer surface of the end part of the outer needle, corresponding to the tip, is provided with self-locking threads, and the outer needle and the inner needle are locked or unlocked through a locking structure.

On the basis of the technical scheme, the invention can be improved as follows.

Further, the middle section of the inner needle is provided with a locking external thread, the inner wall of the middle section of the outer needle is provided with a locking internal thread, the locking external thread and the locking internal thread are screwed together, and the locking external thread and the locking internal thread form the locking structure.

Further, the thread pitches of the locking external thread and the locking internal thread are larger than the thread pitches of the self-locking threads.

Further, a screw hole is formed in the middle section of the outer needle, and the locking structure comprises a set screw screwed into the screw hole and used for being screwed to abut against or separate from the inner needle.

Further, the middle section of the outer needle is provided with a first pin hole with two sides penetrating through the middle section, the middle section of the inner needle is provided with a second pin hole matched with the first pin hole, the locking structure comprises a pin, and the pin penetrates through the first pin hole and the second pin hole.

Further, a drill connector is arranged at the end part of the outer needle, which is far away from the tip end, and the outer contour of the cross section of the drill connector is polygonal.

Further, the drill connector is provided with a through hole through which the inner needle passes.

Further, the drilling tool comprises a handle, wherein one end of the handle is provided with an assembly hole matched with the drilling tool connector, and the drilling tool connector is embedded into the assembly hole.

Further, one end of the outer needle is tapered.

Further, the diameter of the inner needle is 1.5-2.0mm, and the diameter of the outer needle is 2.0-3.5mm.

The beneficial effects of the invention are as follows: the structure design is simple and reasonable, the structural strength of the whole self-locking needle can be ensured, the fracture is difficult to occur, and meanwhile, the bone self-locking needle can be effectively coupled and fixed with the bone block, so that the subsequent bone block can be reset smoothly.

Drawings

FIG. 1 is a cross-sectional view of one embodiment of a self-locking needle of the present invention;

FIG. 2 is a cross-sectional view of another embodiment of the self-locking needle of the present invention;

FIG. 3 is a cross-sectional view of a further embodiment of the self-locking needle of the present invention;

FIG. 4 is a cross-sectional view of a further embodiment of the self-locking needle of the present invention;

fig. 5 is an enlarged view of the part a of fig. 1.

In the drawings, the list of components represented by the various numbers is as follows:

1. an inner needle; 2. an outer needle; 3. a handle; 11. a tip; 12. locking the external thread; 21. self-locking screw threads; 23. a set screw; 24. a pin; 25. drilling tool connector.

Detailed Description

The principles and features of the present invention are described below with reference to the drawings, the examples are illustrated for the purpose of illustrating the invention and are not to be construed as limiting the scope of the invention.

Examples: as shown in fig. 1, 2 and 3, the self-locking needle of this embodiment includes an inner needle 1 and an outer needle 2, one end of the inner needle 1 is provided with a tip 11, the outer needle 2 is a hollow needle body, the hollow needle body is sleeved outside the inner needle 1, the outer surface of the end of the outer needle 2 corresponding to the tip 11 is provided with a self-locking thread 21, and the outer needle 2 and the inner needle 1 are locked or unlocked by a locking structure.

The clinical application process is as follows:

in the minimally invasive surgery, the other end of the inner needle 1 is connected with a drilling tool, the tip 11 of the inner needle 1 is drilled into a bone (bone block) to be fixed, then the outer needle 2 is sleeved along the inner needle 1, in the rotating process, the self-locking thread 21 at one end of the outer needle 2 is screwed with the wall of the drilled hole in the bone where the tip 11 is located, the self-locking thread 21 at the other end of the outer needle 2 is effectively coupled with the wall of the drilled hole in the bone where the tip 11 is located, the outer needle 2 is firmly connected with the bone, in the process, the outer needle 2 and the inner needle 1 are synchronously locked through a locking structure, so that the inner needle 1 and the outer needle 2 can be effectively connected with the bone, and then the other end of the outer needle 2 is operated to drive the bone to reset. The whole structural design is simple and reasonable, the structural design of the outer needle 2 is sleeved outside the inner needle 1, so that the structural strength of the whole self-locking needle can be ensured, breakage is not easy to occur, meanwhile, the self-locking thread 21 of the outer needle 2 can be fixedly coupled with a bone block effectively, and meanwhile, the inner needle and the outer needle are locked through the locking structure, so that the subsequent bone block is reset smoothly.

In this embodiment, the locking structure at least includes the following structural forms:

1) As shown in fig. 1, a locking external thread 12 is provided in the middle section of the inner needle 1, a locking internal thread is provided in the inner wall of the middle section of the outer needle 2, and the locking external thread 12 is screwed with the locking internal thread, and the locking external thread and the locking internal thread form the locking structure together.

In the above scheme 1), after the outer needle 2 is sleeved outside the inner needle 1, one end of the outer needle 2 is pushed toward the tip 11 along the inner needle 1 until one end of the outer needle 2 is about to enter the bore hole where the tip 11 is located (at this time, the locking male thread 12 is just close to the locking female thread), then, the outer needle 2 is operated to be screwed relative to the inner needle 1 so that the locking male thread 12 and the locking female thread are coupled, and simultaneously, the self-locking thread 21 at one end of the outer needle 2 is screwed into the bone bore hole where the tip 11 is located and screwed (coupled) with the inner wall of the bore hole, so that after the locking male thread 12 is screwed into place with the locking female thread, the self-locking thread 21 is also screwed into place in the bore hole, thereby tightly connecting the whole inner and outer needles with the bone. The whole structure is simple in design, no additional structure is added, the operation is simple and quick, and only the outer needle 2 is required to be rotated.

In this embodiment, the pitch of the locking male screw 12 and the locking female screw is larger than the pitch of the self-locking screw 21. The locking internal thread and the locking external thread 12 are both threads with larger screw pitches, and only the locking internal thread and the locking external thread are matched with threaded connection, so that the locking internal thread and the locking external thread can be self-locked, and the coupling self-locking between the outer needle 2 and the inner needle 1 is simpler and quicker due to the larger screw pitch design.

2) As shown in fig. 2, the middle section of the outer needle 2 is provided with a screw hole, the locking structure includes a set screw 23, and the set screw 23 is screwed into the screw hole and is used for being screwed against or separated from the inner needle 1. The supplementary ones are: when the whole self-locking needle is required to be removed, the outer needle 2 is reversely rotated, so that the locking inner thread and the locking outer thread 12 are mutually separated, meanwhile, the self-locking thread 21 is separated from the drilling hole, the outer needle 2 is removed, and then the inner needle 1 is pulled out.

In the above scheme 2), after the self-locking thread 21 which is screwed to one end of the inner needle 1 relative to the outer needle 2 is operated to be tightly connected with the drilling hole where the tip 11 is located, the set screw 23 is screwed into the screw hole in the middle section of the outer needle 2, the inner needle 1 and the outer needle 2 can be relatively fixed by operating the set screw 23 to tightly prop against the surface of the inner needle 1, and the structural design is simpler in processing and production, and the operation is simpler and faster. The supplementary ones are: when the whole self-locking needle needs to be removed, the set screw 23 is reversely rotated to be separated from the screw hole, then the outer needle 2 is taken down, and the inner needle 1 is pulled out.

3) As shown in fig. 3, the middle section of the outer needle 2 is provided with a first pin hole through which two sides penetrate, the middle section of the inner needle 1 is provided with a second pin hole adapted to the first pin hole, the locking structure comprises a pin 24, and the pin 24 penetrates through the first pin hole and the second pin hole.

In the above scheme 3), after the outer needle 2 is operated to be tightly connected with the self-locking thread 21 at one end of the inner needle 1 and the drill hole where the tip 11 is located, the first pin hole and the second pin hole are aligned (the alignment can be achieved by the rotation of the outer needle 2 operated by a medical staff), and a pin 24 is penetrated through the first pin hole and the second pin hole, so that the outer needle 2 and the inner needle 1 are not relatively displaced, that is, the outer needle 2 and the inner needle 1 are locked with each other. The supplementary ones are: when the whole self-locking needle is required to be removed, the pin 24 is pulled out, the outer needle 2 is reversely rotated to be separated from the drilled hole, then the outer needle 2 is taken down, and the inner needle 1 is pulled out.

As a preferred embodiment, the end of the outer needle 2, which is far from the tip 11, is provided with a drill connector 25, and the outer contour of the cross section of the drill connector 25 is polygonal.

In the above embodiment, a drill connector 25 adapted to the drill is disposed at the end of the outer needle 2 away from the tip 11, so that the outer needle 2 is convenient to connect with the drill, and the outer needle 2 is driven to rotate relative to the inner needle 1 by operating the drill, so that the self-locking thread 21 at one end of the outer needle 2 is screwed into the drill hole to be tightly matched.

In this embodiment, the drill connector 25 is provided with a through hole through which the inner needle 1 passes. The device is suitable for the size configuration that the inner needle 1 is longer than the outer needle 2.

As a preferred embodiment, as shown in fig. 4, the portable electric drill further comprises a handle 3, wherein one end of the handle 3 is provided with an assembly hole adapted to the drill connector 25, and the drill connector 25 is embedded in the assembly hole.

In the above embodiment, the whole self-locking needle is provided with a detachable handle 3, when the outer needle 2 is sleeved outside the inner needle 1 and needs to be screwed into a drilled hole, the handle 3 is inserted into the drill connector 25, and then the handle 3 is held to drive the outer needle 2 to manually screw in, so that the self-locking thread 21 at one end of the outer needle 2 is tightly matched with the drilled hole on the bone.

As a preferred embodiment, as shown in fig. 5, one end portion of the outer needle 2 is tapered (in the figure, b means the tapered structure).

In the above embodiment, one end of the outer needle 2 is tapered, so that the end of the outer needle 2 can more easily enter the drill hole where the tip 11 is located, and the self-locking thread 21 can be easily screwed in later.

In this embodiment, the diameter of the inner needle 1 is 1.5-2.0mm, and the diameter of the outer needle 2 is 2.0-3.5mm.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.

Claims

1. A self-locking needle, characterized in that: including interior needle (1) and outer needle (2), the one end of interior needle (1) is equipped with pointed end (11), outer needle (2) are hollow needle body, and its cover is located outside interior needle (1), outer needle (2) correspond the surface of the one end tip of pointed end (11) is equipped with auto-lock screw thread (21), outer needle (2) are through locking structure locking or unblock with interior needle (1).

2. A self-locking needle as claimed in claim 1, wherein: the middle section of the inner needle (1) is provided with a locking external thread (12), the inner wall of the middle section of the outer needle (2) is provided with a locking internal thread, the locking external thread (12) and the locking internal thread are screwed together, and the locking external thread and the locking internal thread jointly form the locking structure.

3. A self-locking needle as claimed in claim 2, wherein: the thread pitch of the locking external thread (12) and the locking internal thread is larger than the thread pitch of the self-locking thread (21).

4. A self-locking needle as claimed in claim 1, wherein: the middle section of the outer needle (2) is provided with a screw hole, the locking structure comprises a set screw (23), and the set screw (23) is screwed in the screw hole and used for being screwed against or separated from the inner needle (1).

5. A self-locking needle as claimed in claim 1, wherein: the middle section of outer needle (2) is equipped with the both sides and runs through its first pinhole, the middle section of inner needle (1) be equipped with the second pinhole of first pinhole adaptation, locking structure includes pin (24), pin (24) run through first pinhole and second pinhole.

6. A self-locking needle as claimed in claim 1, wherein: the end part of one end of the outer needle (2) far away from the tip (11) is provided with a drilling tool connector (25), and the outer contour of the cross section of the drilling tool connector (25) is polygonal.

7. A self-locking needle as defined in claim 6, wherein: the drill connector (25) is provided with a through hole for the inner needle (1) to pass through.

8. A self-locking needle as defined in claim 6, wherein: the drilling tool is characterized by further comprising a handle (3), wherein an assembly hole matched with the drilling tool connector (25) is formed in one end of the handle (3), and the drilling tool connector (25) is embedded into the assembly hole.

9. A self-locking needle as claimed in claim 1, wherein: one end of the outer needle (2) is tapered.

10. A self locking needle according to any one of claims 1 to 9, wherein: the diameter of the inner needle (1) is 1.5-2.0mm, and the diameter of the outer needle (2) is 2.0-3.5mm.