Three-dimension-extending intramedullary nail

Abstract

A three-dimension-extending intramedullary nail, which is made of memory metal, comprises a rod-shaped body, two distal ends formed at two ends of the rod-shaped body, and a plurality of bent portions on the rod-shaped body and between the two distal ends. Each of the bent portions is bent around a curve center and defines a reference plane whereon the bent portion and the curve center are disposed, and at least two of the reference planes of the bent portions are different. The three-dimension-extending intramedullary nail can be implanted into marrow cavity in one time and is applicable to the treatment of various fracture patients. In addition, the three-dimension-extending intramedullary nail is flexible and can be bent according to the curvature of the marrow cavity, thereby being applicable to the marrow cavity of different length. Moreover, the three-dimension-extending intramedullary nail can also form axial deformation to apply pressure upon fracture surface, thus to pull and pressure the fracture surface and promote bone regeneration and shorten fracture healing time.

Description

technical field [0001] The invention relates to the technical field of intramedullary nail medical equipment, in particular to a medical equipment with a three-dimensional fixed pressure memory intramedullary nail, which is used for treating long bone fractures and can increase the fixation effect on fractures. Background technique [0002] The general medical method used to treat long bone fractures is to implant an intramedullary nail in the bone marrow cavity to fix the bone at the fracture site, compress the broken surface of the bone, regenerate the bone and shorten the healing time. [0003] Please refer to Figure 1a to Figure 1c , which is an existing intramedullary nail 9 disclosed in the patent case of "Fork Self-propelled Intramedullary Nail" in Taiwan Announcement No. 578541. like Figure 1a As shown, the intramedullary nail 9 is a rod body, one end of which is provided with several fork rods 91 extending in different directions and showing an open shape, and th...

AI Technical Summary

Problems solved by technology

[0006] 1. The fixation effect is limited: due to the several forks 91 of the intramedullary nail 9, the opening angle is preset, which is easily limited by the size of the patient's bone marrow cavity or the state of elastic fatigue, so the opening angle is limited and the fixation effect is caused bad

[0007] 2. The fractures that can be treated are limited: because the bone marrow cavity at both ends of the long bone is relatively wide, the implantation process of the intramedullary nail 9 needs to be carried out in sections. After the intramedullary nail 9 passes through one end of the bone marrow cavity, At the broken part of the long bone, several prongs 91 are gradually opened during the implantation process, so the intramedullary nail 9 can only be applied to the treatment of fractures that are completely broken. does not provide treatment

[0008] 3. Complex structure: Since the intramedullary nail 9 needs to be provided with grooves 911 with varying depths on several prongs 91, the structure is complex, the manufacturing cost is high, and the intramedullary nail 9 that is too thin is more likely to fail to be processed. Therefore, the size of the intramedullary nail 9 that can be provided is limited, resulting in inconvenience in clinical application

[0009] 4. Cannot be implanted laterally from the long bone: The so-called lateral direction refers to the direction that deviates from the central axis of the marrow cavity of the long bone

Because the intramedullary nail 9 cannot be bent, the intramedullary nail 9 can only be implanted in the axial direction of the long bone, and it is not suitable for treating long bones such as femur and tibia with more complicated tissues and bones at both ends. Fracture accidents are very common clinically, so the practicability of the intramedullary nail 9 is not high

[0010] 5. Can’t be universally used for long bones of different lengths: Since the intramedullary nail 9 has a fixed length, the hospital needs to prepare various intramedullary nails 9 of different sizes for use in the marrow cavity of long bones of different sizes. The material management is very inconvenient, and it is easy to cause pressure on manufacturers to stock up

Furthermore, even if there are various intramedullary nails 9 of different length specifications, it is difficult to avoid the problem that the length cannot fully meet the requirements in clinical practice. At this time, most of them can only drill deeper holes in the patient's bone. , to meet the extra implantation depth required by the overly long intramedullary nail 9, that is, part of the excavated bone marrow is actually an unnecessary excessive injury to the patient

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