CN205286506U - Intramedullary nail - Google Patents

Abstract

The utility model relates to an intramedullary nail, comprising a nail body and a sealing cap; the sealing cap is in the shape of a circular platform and has external threads on the side, the left end of the sealing cap is provided with a hexagonal counterbore, and the right end of the sealing cap is centered on the axis of the sealing cap A locking hole is provided; the shape of the locking hole is consistent with the outline of the sealing cap. The side of the sealing cap is provided with at least two strip-shaped notches communicating with the locking hole, and the strip-shaped notches are symmetrically distributed around the axis of the sealing cap; the proximal end of the nail body is embedded in the sealing cap in the locking hole. The intramedullary nail proposed by the utility model can effectively relieve the suffering of patients no matter in the process of implanting or taking out the intramedullary nail. In addition, due to the elastic design of the cap, the medical staff can choose to use the nail body of the corresponding size according to different bone sizes within a certain range, which not only saves resources but is convenient to use and can achieve a good fixing effect; the anti-rotation of the surface of the nail body The design of the groove further realizes the effect of preventing the nail body from rotating.

Description

an intramedullary nail

technical field

The utility model belongs to the technical field of medical instruments, in particular to an intramedullary nail.

Background technique

Intramedullary nail is a commonly used fracture internal fixation device, which is generally used for internal fixation of long bone fractures such as metacarpal, radius, humerus, femur, and tibia. In the intramedullary nail in the prior art, one is that the nail body is provided with a through hole, and the screw passes through the through hole of the nail body from the outside to fix the bone. The other includes a nail body and a cap, the cap is provided with external threads and the nail body and the cap are movably connected; this kind of intramedullary nail is screwed into the minimally invasive hole of the bone and withstands the nail body, And then realize the fixation to the bone. The advantages of the above-mentioned intramedullary nails lie in the following aspects: 1. It can control the axial line of force at the fracture site, and the interlocking intramedullary nail can prevent the rotation deformity of the fracture and reduce the risk of fracture of the implant; 2. It adopts closed and minimally invasive techniques , reducing the rate of surgical infection; 3. Reduce the damage to the periosteal blood supply, retain the growth factors with osteogenic effects in the hematoma, the reamed debris has the effect of autologous bone grafting, and the muscle contraction produces fretting to provide mechanical stimulation and other factors to promote Fracture healing; 4. Central fixation, elastic fixation, stress dispersion to avoid stress shielding effect, and low incidence of re-fracture; 5. Firm fixation can enable early functional exercise and weight bearing; 6. Internal fixation is removed through a small incision, minimally invasive. However, while having the above advantages, the intramedullary nails in the prior art have also exposed the following problems: 1. The fixation effect is not ideal; Because of the clearance fit and the nail itself is easy to rotate, the locking effect of the screw on the intramedullary nail is usually not ideal, which will inevitably cause deformity at the fracture site and affect the healing; 2. Due to the fixed size of the intramedullary nail, it is inconvenient to use and also Caused a waste of resources.

Utility model content

The purpose of the utility model is to provide a safe, reliable, easy-to-use intramedullary nail capable of achieving a good fixation effect in view of the deficiencies in the prior art.

In order to solve the above technical problems, the utility model adopts the following technical solutions:

An intramedullary nail, comprising a nail body and a sealing cap; the sealing cap is in the shape of a truncated cone and has external threads on the side, a hexagonal counterbore is provided at the left end of the sealing cap, and a locking hole is provided at the right end centering on the axis of the sealing cap. hole; the shape of the locking hole is consistent with the outline of the sealing cap; the side of the sealing cap is provided with at least two bar-shaped notches communicating with the locking hole, and the bar-shaped notches are centered on the axis of the sealing cap The center is distributed symmetrically; the proximal end of the nail body is inserted into the locking hole of the sealing cap.

Further, the distal end of the nail body is flat and has an arc-shaped longitudinal section, and the nail body is cylindrical except for the distal end.

Further, the surface of the nail body is provided with more than one strip-shaped decompression plane, and the decompression plane extends from the proximal end to the distal end of the nail body.

Further, at least one anti-rotation groove is provided on the surface of the nail body, and the anti-rotation groove is arranged along the axial direction of the nail body.

The beneficial effect of the utility model is that: the intramedullary nail proposed by the utility model has a separate design of the sealing cap and the nail body, which can greatly reduce the pain of the patient during the implantation or removal of the intramedullary nail. pain. In addition, due to the elastic design of the cap, the medical staff can choose to use the nail body of the corresponding size according to different bone sizes within a certain range; it saves resources and is convenient to use, and can achieve a good fixation effect; The design of the spiral groove further realizes the effect of preventing the nail body from rotating.

Description of drawings

Fig. 1 is the nail body schematic diagram of the present utility model.

Fig. 2 is a perspective view of the sealing cap of the present utility model.

Fig. 3 is an enlarged structural diagram of the sealing cap of the present invention.

Fig. 4 is an enlarged left view of the sealing cap of the present invention.

In the figure: 1-nail body, 11-anti-rotation groove, 12-decompression plane; 2-sealing cap, 21-hexagonal counterbore, 22-locking hole, 23-strip notch.

detailed description

Preferred embodiments of the present utility model will be described in detail below in conjunction with the accompanying drawings.

Please refer to Fig. 1 to Fig. 4, the utility model discloses an intramedullary nail, comprising a nail body 1 and a cap 2; There is a hexagonal counterbore 21, and a locking hole 22 is opened at the right end centering on the axis of the sealing cap 1; the shape of the locking hole 22 is consistent with the outline of the sealing cap 2; the side of the sealing cap 2 is provided with at least two The strip-shaped notch 23 communicating with the locking hole 22 is symmetrically distributed around the axis of the cap 2 ; the proximal end of the nail body 1 is inserted into the locking hole 22 of the cap 2 .

As a preferred solution, the distal end of the nail body 1 is flat and has an arc-shaped longitudinal section, the nail body 1 is cylindrical except for the distal end, and the intramedullary nail is in the shape of a strip as a whole. Of course, the cross-sectional diameter of the intramedullary nail can also be gradually reduced from the distal end to the proximal end; the intramedullary nail is preferably made of elastic material.

As a preferred solution, the surface of the nail body 1 is provided with more than one strip-shaped decompression plane 12 , and the decompression plane 12 extends from the proximal end to the distal end of the nail body 1 . The purpose of the design of the decompression plane 12 is to reduce the fastening pressure of the intramedullary nail itself; meanwhile, it can also relieve the pain of the patient to a certain extent.

As a preferred solution, at least one anti-rotation groove 11 is provided on the surface of the nail body 1 , and the anti-rotation groove 11 is arranged along the axial direction of the nail body 1 . The design of the anti-rotation groove 11 further realizes the good fixation of the bone by the intramedullary nail.

In the prior art, the intramedullary nail is integrally formed, which cannot be used flexibly; at the same time, it is very difficult to remove the intramedullary nail, which will inevitably cause a second injury to the patient; in addition, because the intramedullary nail is easy to rotate, the intramedullary nail will cause damage to the fracture site. Inadequate fixation often leads to failed or repeated operations. Through the above scheme, the intramedullary nail is decomposed into nail body 1 and sealing cap 2, and since the sealing cap 2 is in the shape of a truncated cone and is provided with a strip-shaped gap 23 connected to the locking hole 22, the medical staff can use it within a certain range according to the The nail body 1 of the corresponding size is selected for different bone sizes, which is flexible and convenient, and saves resources. In addition, due to the elastic design of the cap 2, the locking of the nail body 1 is also effectively realized when the cap 2 is screwed into the bone. Furthermore, since the left end of the sealing cap is provided with a self-tapping hexagonal counterbore, while facilitating the screwing in and out of the intramedullary nail, it can effectively avoid secondary damage to the patient.

The description and application of the present invention here are illustrative, and are not intended to limit the scope of the present invention to the above-mentioned embodiments. It should be clear to those skilled in the art that, without departing from the spirit or essential characteristics of the present invention, the present invention can be realized in other forms, structures, arrangements, proportions, and with other components, materials and parts. Other modifications and changes may be made to the embodiments disclosed herein without departing from the scope and spirit of the invention.

Claims (4)

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.