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Built-in intramedullary fixing device

A fixation device, built-in technology, applied in the direction of internal fixator, fixator, internal bone synthesis, etc., can solve the problems of reducing the rate of surgical infection, high patient pressure, and high fracture healing rate, and achieves preservation of soft tissue attachment and medullary cavity wall. Less damage and less damage to microcirculation

Inactive Publication Date: 2018-12-14
陈聚伍
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Internal fixation methods for fractures are nothing more than steel plates and intramedullary nails. Plate internal fixation has the advantages of simple operation and short learning period, but the trauma is large, the probability of accidental injury is high, infection and nonunion, delayed union, broken nails and broken plates occur from time to time. The posterior scar is large, which affects the appearance and does not conform to the principle of minimally invasive. The intramedullary nail adopts closed and minimally invasive technology. The locking intramedullary nail can prevent the fracture rotation deformity and reduce the risk of fracture of the implant; reduce the surgical infection rate; promote fracture The healing rate is high; the central fixation avoids the effect of stress shielding, and the incidence of re-fracture is low; it conforms to the principle of minimal invasiveness and is the current development direction, but it is difficult to operate and learn, and it is difficult to lock the distal end of the intramedullary nail. However, none of them are anatomically reduced, non-union and delayed union may occur, and the pressure on the patient is high

Method used

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  • Built-in intramedullary fixing device
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  • Built-in intramedullary fixing device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Embodiment 1: as figure 1 The shown built-in intramedullary fixation device is suitable for the fixation of long and short tubular bone fractures of limbs, wherein the intramedullary support rod 1 can be installed in the medullary cavity 15 and can slide freely. The inner support rod is a smooth equal-diameter rod, and its two ends are smooth or have a taper to facilitate assembly. Such as Image 6 As shown, in this embodiment, the intramedullary support rod 1 with a triangular cross-section is preferably used.

[0035] On the three sides of the main body of the intramedullary support rod 1 , a rack 3 is arranged in the middle of at least one side, and the rack 3 is parallel to the axial direction. At the same time, if figure 2 As shown, the radial screw holes 2 are uniformly distributed along the radial direction at equal intervals d in the region of the rack 3, and the centers of the radial screw holes 2 are located on the same generatrix.

[0036] When using thi...

Embodiment 2

[0045] Embodiment 2: on the basis of embodiment 1, adopt such as image 3 with Figure 4 As shown in the positioning installation frame 4 , the main rod of the positioning installation frame 4 is parallel to the intramedullary support rod 1 . Positioning holes 8 are distributed at equal intervals d on the main rod of the positioning mounting frame 4, and the positioning holes 8 of the external positioning mounting frame 4 are used to determine the positions of the radial screw holes 2 on the built-in intramedullary support rod 1 .

[0046] Such as image 3 As shown, an initial positioning pin 5 is fixedly installed in one of the positioning holes 8 , and a side key 6 is provided on the side of the initial positioning pin 5 . At the same time, a keyway 7 is provided on the inner wall of at least one radial screw hole 2 of the intramedullary support rod 1 , the initial positioning pin 5 can be matched and inserted into the radial screw hole 2 , and the side key 6 and the keyw...

Embodiment 3

[0047] Embodiment 3: On the basis of Embodiment 1 or 2, the intramedullary support rod 1 is a variable prism type, see respectively Figure 5 The regular hexagonal prism shown, Figure 7 The square prism shown and Figure 8 Circular or semicircular prisms as shown. The prismatic design can especially adopt the triangular design, the ridgeline of the medullary cavity 15 is in the most stable contact, the wall of the medullary cavity 15 is least damaged, and the microcirculation is least damaged. The intramedullary support rod 1 is fixed to the backbone through screws, and has the characteristics of firm and stable fixation.

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Abstract

The invention discloses a built-in intramedullary fixing device. The fixing device includes an intramedullary support rod which can be mounted within a medullary space, wherein at least one rack parallel to the axial direction is arranged on a main body of the intramedullary support rod, radial screw holes are arranged in the rack area in the radial direction, and each radial screw hole is matchedwith a radial locking pin and is further equipped with a shifting tool that can be engaged with the rack. The fixing device has advantages of an intramedullary nail and a steel plate and further avoids disadvantages of the intramedullary nail and the steel plate, repositioning the fracture under direct vision can achieve anatomic reduction, soft tissue adhesion of a fracture block can be retained, blood supply is maintained, the intramedullary support rod is implanted from a fracture end, operation is simple and easy to learn, and the implanting orientation of the intramedullary support rod can be flexibly adjusted according to the fracture type to facilitate use of screws to fix the fracture.

Description

Technical field: [0001] The invention belongs to the technical field of fracture fixation instruments, and in particular relates to a built-in intramedullary fixation device. Background technique: [0002] Internal fixation methods for fractures are nothing more than steel plates and intramedullary nails. Plate internal fixation has the advantages of simple operation and short learning period, but the trauma is large, the probability of accidental injury is high, infection and nonunion, delayed union, broken nails and broken plates occur from time to time. The posterior scar is large, which affects the appearance and does not conform to the principle of minimally invasive. The intramedullary nail adopts closed and minimally invasive technology. The locking intramedullary nail can prevent the fracture rotation deformity and reduce the risk of fracture of the implant; reduce the surgical infection rate; promote fracture The healing rate is high; the central fixation avoids the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B17/72
CPCA61B17/7283
Inventor 陈聚伍
Owner 陈聚伍
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