CN205286506U

CN205286506U - Intramedullary nail

Info

Publication number: CN205286506U
Application number: CN201521130657.6U
Authority: CN
Inventors: 褚德余
Original assignee: SHANGHAI PUWEI MEDICAL INSTRUMENT FACTORY CO Ltd
Current assignee: SHANGHAI PUWEI MEDICAL INSTRUMENT FACTORY CO Ltd
Priority date: 2015-12-30
Filing date: 2015-12-30
Publication date: 2016-06-08
Anticipated expiration: 2025-12-30

Abstract

The utility model relates to an intramedullary nail, including the nail body and sealing cap, the sealing cap is the round platform form and the side is equipped with the external screw thread, the sealing cap left end is equipped with the hexagonal counter bore, the right -hand member uses the axis of sealing cap to offer the locking hole as the center, the shape in locking hole is unanimous with the profile of sealing cap. The side of sealing cap be provided with at least two with the communicating bar breach in locking hole, the bar breach uses the axis of sealing cap to distribute as central symmetry, the near -end embedding of the nail body the locking of sealing cap is downthehole. The utility model provides a no matter intramedullary nail is in intramedullary nail's implantation or takes out the in -process, can all effectively alleviate patient's misery. In addition, because the elastic design (allowable stress design) of sealing cap, medical personnel can use the nail body of corresponding size according to the skeleton size select of difference at certain within range, not only resources are saved but also facilitate the use and can realize good fixed effect, the design of revolving the groove of preventing of nail body surface face has then further realized the effect that prevents to follow closely the trunk circling.

Description

A kind of intramedullary pin

Technical field

This utility model belongs to technical field of medical instruments, particularly relates to a kind of intramedullary pin.

Background technology

Intramedullary pin is a kind of conventional Fracture internal fixaiion equipment, and it is generally used for the interior fixing of the long bone fractures such as metacarpal bone, radius, humerus, femur, tibia. Intramedullary pin of the prior art, one is that rivet nut is provided with through hole, and skeleton is fixed by screw from outside through the through hole of rivet nut. Another kind includes rivet nut and sealing cap, and described sealing cap is provided with external screw thread and rivet nut is flexibly connected with sealing cap; This kind of intramedullary pin namely by screwing in the minimally invasive hole of skeleton and withstanding rivet nut by sealing cap, and then realizes fixing skeleton. The advantage of above-mentioned intramedullary pin is in that following several respects: 1. can control the axial line of force of fracture site, intramedullary nail with lock is possible to prevent fracture rotation deformity, reduce the risk of inner matter fracture; 2. adopt Guan Bi and less invasive techniques, decrease postoperative infection rate; 3. periosteum blood is transported by minimizing destruction, the have somatomedin of ossification, the expansion marrow chip retained in hematoma have the factor promotion union of fracture such as autologous bone graft effect, muscle contraction generation fine motion offer mechanical stimulation; 4. center fix, flexible fastening, stress dispersion avoid stress force shelter reaction, refracture incidence rate is low; 5. fixation can early functional exercise and heavy burden; 6. in, fixing taking-up is by little otch, Wicresoft. But, while having above advantage, intramedullary pin of the prior art also exposes following problem: 1. in fixed effect, effect is undesirable; Easily rotating owing to being matched in clearance and rivet nut itself between through hole and screw rod or between rivet nut and sealing cap, screw is generally unsatisfactory to the locking effect of intramedullary pin, causes fracture to produce deformity, impact healing unavoidably; 2., owing to the size of intramedullary pin is fixed, cause the awkward waste that simultaneously also result in resource.

Utility model content

The purpose of this utility model is in that for deficiency of the prior art, it is provided that one is safe and reliable, easy to use and can realize good fixed effect intramedullary pin.

For solving above-mentioned technical problem, this utility model adopts the following technical scheme that

A kind of intramedullary pin, including rivet nut and sealing cap; Described sealing cap is round table-like and side is provided with external screw thread, and described sealing cap left end is provided with hexagonal counterbore, right-hand member and offers locking hole centered by the axis of sealing cap; The shape of described locking hole is consistent with the profile of sealing cap; The side of described sealing cap is provided with the bar v notch v that at least two communicates with described locking hole, and described bar v notch v is symmetrical centered by the axis of sealing cap; The near-end of described rivet nut embeds in the locking hole of described sealing cap.

Further, the far-end of described rivet nut is flat and longitudinal section is curved, and described rivet nut is cylindrical structure except far-end.

Further, the surface of described rivet nut is provided with more than one elongated decompression Plane, and described decompression Plane extends far-end from the near-end of rivet nut.

Further, the surface of described rivet nut is additionally provided with at least one anti-spin slot, axially arranged along rivet nut of described anti-spin slot.

The beneficial effects of the utility model are in that: the intramedullary pin that the utility model proposes, and its sealing cap and rivet nut design for split, no matter are in the implantation or taking-up process of intramedullary pin, can alleviate the misery of patient largely. Further, since the Flexible Design of sealing cap, medical personnel can select to use the rivet nut of corresponding size according to different skeletal size in certain scope; Not only economize on resources but also facilitate use, and good fixed effect can be realized; The design of the anti-spin slot on rivet nut surface then furthermore achieved that the effect preventing rivet nut from rotating.

Accompanying drawing explanation

Fig. 1 is rivet nut schematic diagram of the present utility model.

Fig. 2 is the axonometric chart of this utility model sealing cap.

Fig. 3 is the amplification assumption diagram of this utility model sealing cap.

Fig. 4 is the left view after this utility model sealing cap amplifies.

In figure: 1-rivet nut, the anti-spin slot of 11-, 12-decompression Plane; 2-sealing cap, 21-hexagonal counterbore, 22-locking hole, 23-bar v notch v.

Detailed description of the invention

Preferred embodiment of the present utility model is described in detail below in conjunction with accompanying drawing.

Refer to Fig. 1 to Fig. 4, the utility model discloses a kind of intramedullary pin, including rivet nut 1 and sealing cap 2; Described sealing cap 1 is provided with external screw thread in round table-like and side, and described sealing cap 2 left end is provided with hexagonal counterbore 21, right-hand member and offers locking hole 22 centered by the axis of sealing cap 1; The shape of described locking hole 22 is consistent with the profile of sealing cap 2; The side of described sealing cap 2 is provided with the bar v notch v 23 that at least two communicates with described locking hole 22, and described bar v notch v 23 is symmetrical centered by the axis of sealing cap 2; The near-end of described rivet nut 1 embeds in the locking hole of sealing cap 2 22.

Preferably, the far-end of described rivet nut 1 is flat and longitudinal section is curved, and described rivet nut 1 is cylindrical structure except far-end, and the entirety of described intramedullary pin is strip. Certainly, the diameter of section of intramedullary pin progressively can also be reduced to near-end by far-end; Described intramedullary pin is preferably used elastomeric material.

Preferably, the surface of described rivet nut 1 is provided with more than one elongated decompression Plane 12, and described decompression Plane 12 extends far-end from the near-end of rivet nut 1. The purpose of design of decompression Plane 12 is in that to alleviate the fastening pressure of intramedullary pin self; It is also possible to alleviate the misery of patient to a certain extent.

Preferably, the surface of described rivet nut 1 is additionally provided with at least one anti-spin slot 11, axially arranged along rivet nut 1 of described anti-spin slot 11.The design of anti-spin slot 11 then furthermore achieved that the good of skeleton is fixed by intramedullary pin.

In prior art, intramedullary pin is one-body molded, it is impossible to use flexibly; Intramedullary pin is highly difficult when taking out simultaneously, and patient causes second time damage unavoidably; Further, since intramedullary pin easily rotates, cause intramedullary pin that fracture is fixing loosely, often result in operative failure or be repeatedly performed. By such scheme, intramedullary pin is decomposed into rivet nut 1 and sealing cap 2 two parts, and owing to sealing cap 2 is truncated cone-shaped and the bar v notch v 23 being communicated with locking hole 22, medical personnel can select to use the rivet nut 1 of corresponding size according to different skeletal size in certain scope, both flexible, economize on resources again. Further, since the Flexible Design of sealing cap 2, while sealing cap 2 screws in skeleton, also effectively achieve the locking to rivet nut 1. Further, owing to the left end of sealing cap is provided with self tapping hexagonal counterbore, while facilitating intramedullary pin to screw in, screwing out, can be prevented effectively from and patient is caused secondary damage.

Here description of the present utility model and application is illustrative, is not wishing to limit in the above-described embodiments scope of the present utility model. It should be appreciated by the person skilled in the art that when without departing from spirit of the present utility model or substitutive characteristics, this utility model can in other forms, structure, layout, ratio, and realize with other assembly, material and parts. When without departing from this utility model scope and spirit, it is possible to embodiments disclosed herein is carried out other deformation and changes.

Claims

1. an intramedullary pin, it is characterised in that: include rivet nut and sealing cap; Described sealing cap is round table-like and side is provided with external screw thread, and described sealing cap left end is provided with hexagonal counterbore, right-hand member and offers locking hole centered by the axis of sealing cap; The shape of described locking hole is consistent with the profile of sealing cap; The side of described sealing cap is provided with the bar v notch v that at least two communicates with described locking hole, and described bar v notch v is symmetrical centered by the axis of sealing cap; The near-end of described rivet nut embeds in the locking hole of described sealing cap.

2. intramedullary pin according to claim 1, it is characterised in that: the far-end of described rivet nut is flat and longitudinal section is curved, and described rivet nut is cylindrical structure except far-end.

3. intramedullary pin according to claim 1, it is characterised in that: the surface of described rivet nut is provided with more than one elongated decompression Plane, and described decompression Plane extends far-end from the near-end of rivet nut.

4. intramedullary pin according to any one of claim 1 to 3, it is characterised in that: the surface of described rivet nut is additionally provided with at least one anti-spin slot, axially arranged along rivet nut of described anti-spin slot.