CN210185680U

CN210185680U - Bone-knitting hollow nail assembly

Info

Publication number: CN210185680U
Application number: CN201920670485.3U
Authority: CN
Inventors: Hua Chen; 陈华; Peifu Tang; 唐佩福; Huiying Xue; 薛慧英; Yuanfeng Liu; 刘远风; Dong Chen; 陈东
Original assignee: Shenyang Dongya Medical Research Institute Co Ltd
Current assignee: Shenyang Dongya Medical Research Institute Co Ltd
Priority date: 2019-05-12
Filing date: 2019-05-12
Publication date: 2020-03-27
Anticipated expiration: 2029-05-12

Abstract

The utility model provides a bone-knitting hollow nail assembly, includes guide piece (1), cooperation hollow nail (2) and packing ring subassembly (3) outside the guide piece, its technical essential is: the guide piece (1) comprises a rod part (13) and a guide piece tip part (14) arranged at one end of the rod part (13), wherein the guide piece tip part (14) is formed by the vertex angles of three triangular guide piece tangent planes (11), and a guide piece thread (12) is arranged between the guide piece tangent plane (11) and the rod part (13); the hollow nail (2) comprises a pipe part (26), hollow nail tip parts (21) which are arranged at one end of the pipe part (26) and are circumferentially and uniformly distributed along the axis of the pipe part (26), and end heads (25) which are arranged at the other end of the pipe part (26), wherein screw holes communicated with the hollow part of the pipe part are formed in the end heads (25), hollow nail tangent planes are arranged between the hollow nail tip parts, and the end parts of the hollow nail tangent planes are respectively provided with opening parts. The novel clamping device has the advantages of simple and compact structure, stable and reliable fastening, low rejection of the machine body, convenience and rapidness in use, wide application range and the like.

Description

Bone-knitting hollow nail assembly

Technical Field

The utility model relates to a medical instrument for orthopedics, a hollow bone-knitting nail assembly specifically says so.

Background

The technical scheme of the traditional bone-knitting hollow nail assembly, such as the patella fracture internal fixation device disclosed in the utility model patent with the publication number of CN205514864U, specifically comprises an outer nail body and a titanium cable, wherein the outer nail body is provided with a through hole, an inner nail body is arranged in the through hole, the upper part of the inner nail body is provided with an external thread, and the inner side wall of the upper part of the outer nail body is provided with an internal thread matched with the external thread; set up the first titanium cable passageway that is linked together with the through-hole on the upper portion lateral wall of the outer nail body, first titanium cable passageway level sets up, has seted up second titanium cable passageway on the inside wall of through-hole, the vertical setting of second titanium cable passageway. However, the scheme can only be applied to patellar surgery due to the limitation of structural design, and has the defect of narrow application range, and the internal thread structure is adopted, so that the processing and manufacturing are not facilitated to a certain extent.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a hollow bone screw assembly, fundamentally has solved above-mentioned problem, and it has simple structure compactness, fastening reliable and stable, organism rejection low, convenient to use is swift, application scope advantage such as wide.

In order to achieve the above purpose, the utility model provides a following technical scheme: this bone-knitting hollow nail assembly includes guide piece, the cooperation hollow nail and the packing ring subassembly outside the guide piece, and its technical essential is:

the guide piece comprises a rod part and a guide piece tip part arranged at one end of the rod part, the guide piece tip part is formed by vertex angles of three triangular guide piece tangent planes, and guide piece threads are arranged between the guide piece tangent planes and the rod part;

the hollow nail comprises a pipe part, a hollow nail tip part which is arranged at one end of the pipe part and is circumferentially and uniformly distributed along the axis of the pipe part, and an end head which is arranged at the other end of the pipe part, wherein a screw hole communicated with the hollow part of the pipe part is arranged on the end head, a hollow nail tangent plane is arranged between the hollow nail tip part, and the end part of the hollow nail tangent plane is respectively provided with an opening part.

In order to facilitate the anastomosis of the hollow nail and the bone surface, the gasket assembly comprises a gasket I and a gasket II or a backing plate, and one side of the gasket I is provided with an arc surface matched with the end head.

In order to further improve the fixing stability of the hollow nail, one side of the gasket II back to the gasket I is provided with a plurality of columnar bulges along the circumferential direction.

In order to enlarge the bone surface contact area during fixation, one side of the backing plate is provided with an inclined surface, the inclined surface is provided with a plurality of backing plate bulges, and the longitudinal section of the backing plate is in a right trapezoid shape.

The utility model has the advantages that: different from the existing bone-knitting hollow nail assembly, the guiding piece is only provided with an external thread structure at the fixed end of the bone so as to improve the fixation firmness and is not used for fixing the hollow screw. The hollow screw is not provided with an internal thread structure matched with the guide piece, so that the processing is facilitated. Through setting up the guiding piece, can improve the degree of accuracy of coaptation, the instability of front end when having avoided hollow nail screw in skeleton can be accomplished the operation by a single person. When the bone joint is used, the guide piece with the tip is fixed on one bone, and the other bone is fixed on the bone along the guide piece through the hollow nail, so that the bone joint can be completed, and the use is convenient and quick. The inner side of the end of the hollow screw is of an arc structure and can be matched with the arc surface of the gasket I to achieve the purpose of anastomosis. The other side of the gasket I is of a plane structure and can be matched with the corresponding plane structure of the gasket II or the backing plate, and the other side of the gasket II or the other side of the backing plate is provided with a protruding structure, so that the contact area with the bone surface can be increased, and the fit degree of the whole device and the bone surface is further increased. Therefore, the bone fracture surgical instrument can be used as most bone fracture surgical instruments and has a wider application range.

Drawings

Fig. 1 is an isometric side view structural schematic diagram of the present invention.

Fig. 2 is a schematic diagram I of the exploded structure of the present invention.

Fig. 2a is a partially enlarged schematic structural view of a portion a in fig. 2.

Fig. 2B is a partially enlarged structural diagram of a portion B in fig. 2.

Fig. 3 is a schematic diagram II of the exploded structure of the present invention.

Fig. 3a is a partially enlarged schematic structural view of a portion C in fig. 3.

Description of reference numerals:

1, a guide part; 11 cutting a guide piece; 12 a guide thread; 13 a guide light bar part; 14 a guide tip; 2, hollow nails; 21 hollow nail tip; 22 cutting a hollow nail into a section; 23 hollow nail threads; 24 gap parts; 25 ends; 26 hollow nail polish rod parts;

27 screw holes; 3a gasket assembly; 31 a gasket I; 311 an arc-shaped surface; 32 a gasket II; 321 columnar protrusions; 322 washer II through hole; 33 backing plates; 331 a backing plate through hole; 332 pad projection; 333 beveled.

Detailed Description

The following describes the present invention in detail with reference to fig. 1 to 3 by way of specific embodiments. The bone pin assembly comprises a guide 1, a pin 2 fitted outside the guide and a washer assembly 3. The guide 1 comprises a rod part 13 and a guide tip part 14 arranged at one end of the rod part 13, wherein the guide tip part 14 is formed by the vertex angles of three triangular guide tangent planes 11, and a guide thread 12 is arranged between the guide tangent planes 11 and the rod part 13. The hollow nail 2 comprises a pipe part 26, hollow nail tip parts 21 which are arranged at one end of the pipe part 26 and are uniformly distributed along the axial direction of the pipe part 26, and an end head 25 arranged at the other end of the pipe part 26, wherein a screw hole 27 communicated with the hollow part of the pipe part 26 is arranged on the end head 25, hollow nail tangent planes 22 are arranged between the hollow nail tip parts 21, and the end parts of the hollow nail tangent planes 22 are respectively provided with a gap part 24.

As shown in fig. 2b, the washer assembly 3 comprises a washer I31 and a washer II32 or a backing plate 33, and the washer I31 is provided with an arc-shaped surface 311 on one side for cooperating with the head 25. To match different bone surface morphologies, a combination of the following two types of washers is generally used.

When the facet contact area is small, washer I31 fits washer II32 with washer II through hole 322. The side of the gasket II32 opposite to the gasket I31 is provided with a plurality of columnar protrusions 321 along the circumferential direction. To improve the fit of the washer II32 with the bone surface.

When the bone-surface contact area is large, the washer I31 fits the shim plate 33 having the shim plate through hole 331. The inclined plane 333 is arranged on one side of the backing plate 33, a plurality of backing plate bulges 332 are arranged on the inclined plane 333, and the longitudinal section of the backing plate 33 is in a right trapezoid shape. The hollow pin 2 penetrates the entire backing plate 33 through the backing plate through hole 331, and the inclined surface 333 is in contact with the bone surface (not shown) to compensate for the bone surface vacancy, thereby improving the stability of fixation. The protrusions 332 on the inclined surface can match with the uneven shape of the bone surface, so as to further improve the fitting degree of the backing plate 33 and the bone surface. When the backing plate 33 is made of medical non-metallic material with better toughness, the fit between the backing plate 33 and the bone surface can be further improved.

Taking the example of joining two bones A and B (not shown in the figure), when in use, holes are drilled in the bones A in advance, so that the hollow nail 2 just can penetrate through and be limited in the holes, and the holes are limited along the vertical direction of the central shaft of the hollow nail 2 (the polished rod part of the hollow nail 2 can still rotate in the holes); penetrating the tip 14 of the guide 1 into the bone B; the point 21 of the hollow nail 2 and the point 14 of the guide 1 are in the same direction, under the guiding action of the guide 1, the hollow nail 2 aligns the interface of the bone A and the bone B (at this time, the gasket I31 and the gasket II32 or the cushion plate 33 are sleeved on the polish rod 26 of the hollow nail 2), and the front end of the hollow nail 2 is screwed into the bone B by using a hexagonal wrench, so that the fixation of the bones A and B can be completed. At this point, bone A is firmly held between the washer II32 or washer 33 and the cannulated nail threads 23.

In order to prevent the hollow nail 2 from spinning in the bone, a triangular hollow nail tip 21 is provided. To facilitate the use of the hollow nail 2, a cutting surface 22 and a notch 24 are provided between the tips 21 to guide bone fragments escaping during the screwing-in process, thereby reducing resistance.

The above embodiments are exemplified by socket head cap screws, which are conventional in the art, and it will be apparent to those skilled in the art that other conventional screw hole configurations may be used to effect the threading of the socket head cap screws.

Claims

1. A hollow bone screw assembly comprising a guide (1), a hollow screw (2) fitted outside the guide and a washer assembly (3), characterized in that:

the guide piece (1) comprises a rod part (13) and a guide piece tip part (14) arranged at one end of the rod part (13), wherein the guide piece tip part (14) is formed by the vertex angles of three triangular guide piece tangent planes (11), and a guide piece thread (12) is arranged between the guide piece tangent plane (11) and the rod part (13);

the hollow nail (2) comprises a pipe part (26), hollow nail tip parts (21) which are arranged at one end of the pipe part (26) and are circumferentially and uniformly distributed along the axis of the pipe part (26), end heads (25) which are arranged at the other end of the pipe part (26), screw holes (27) communicated with the hollow parts of the pipe part (26) are formed in the end heads (25), hollow nail tangent planes (22) are arranged between the hollow nail tip parts (21), and the end parts of the hollow nail tangent planes (22) are respectively provided with opening parts (24).

2. The bone pin assembly of claim 1, wherein: the gasket assembly (3) comprises a gasket I (31) and a gasket II (32) or a backing plate (33), and one side of the gasket I (31) is provided with an arc-shaped surface (311) matched with the end head (25).

3. The bone pin assembly of claim 2, wherein: and a plurality of columnar protrusions (321) are arranged on one side of the gasket II (32) back to the gasket I (31) along the circumferential direction.

4. The bone pin assembly of claim 2, wherein: an inclined plane (333) is arranged on one side of the backing plate (33), a plurality of backing plate bulges (332) are arranged on the inclined plane (333), and the longitudinal section of the backing plate (33) is in a right trapezoid shape.