Contrallable micromotion cross-locking intramedullary nail

A technology of intramedullary nailing and interlocking, applied in the field of intramedullary bone-synthesizing devices and micro-motion interlocking intramedullary nails, can solve the problems of unfavorable callus formation, failure to meet fracture stress stimulation gradually strengthened, and weakening of physiological stress stimulation, etc. To achieve the effect of improving healing effect, enhancing healing effect, promoting reconstruction and healing

Inactive Publication Date: 2006-08-09
SOUTHERN MEDICAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this technical solution obviously has the following deficiencies: 1. "Physiological stress stimulation exists all the time during the whole fracture healing process", so it is unfavorable to callus formation in the early stage of fracture, and may even cause bone resorption; Once the intramedullary nail is shortened under the action of external force, it is difficult to return, which weakens the stimulating effect of the physiological stress and significantly deteriorates the effect
According to the technical solution, the elastic element has a small amount of elastic deformation under the action of the external force generated by the limb movement of the fractured person. Once the external force is removed, the length of the intramedullary nail can be restored immediately, which effectively overcomes the second problem of the above-mentioned invention patent. However, the first disadvantage of the above-mentioned invention patents is still unavoidable
In addition, this technical solution also has the fact that the intensity of the stress stimulus produced is constant (the elastic deformation of the elastic element is constant), which cannot meet the requirements of the gradual strengthening of the stress stimulus for the gradual healing of fractures.

Method used

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  • Contrallable micromotion cross-locking intramedullary nail
  • Contrallable micromotion cross-locking intramedullary nail
  • Contrallable micromotion cross-locking intramedullary nail

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0022] This embodiment is a specific embodiment in which a degradable bioactive material 5 (Ruibang Gutai) is provided in the locking nail hole 3 at the distal end of the intramedullary nail. see figure 1 and figure 2 and combine image 3 The outer structure and shape of the entire intramedullary nail, the guide pin hole 1 set at the axis, the tail nail hole 2 set at the tail and the proximal locking nail hole 4 are the same as those of the known intramedullary nails. The structure of the locking nail holes 3 at the two ends has been improved. The distal locking nail holes 3 are all waist-shaped long holes, and the holes are filled with degradable bioactive materials 5 (Ruibang Gutai), and the degradable bioactive materials are reserved for interspersed locking nails during installation. Hole 6. The reserved hole 6 for inserting the locking nail can be made by the following two methods: 1. First, expand the hole 1 of the guide pin hole 1 at the distal end of the intramedu...

example 2

[0026] This embodiment is a specific embodiment in which a degradable bioactive material 5 (hydroxyapatite) is provided in the locking nail hole 4 at the proximal end of the intramedullary nail. See Figure 4 and Figure 5 and combine Image 6, in order to make the biodegradable bioactive material 5 tightly combined with the intramedullary nail body, so that it will not be separated due to the movement of the limb of the fractured person, in this example, the proximal locking nail hole 4 is processed into a waist-shaped long hole, and the hole wall faces the intramedullary The inner body of the nail expands into an arc shape, so that the degradable bioactive material 5 injected therein forms a flat drum shape. In order to further improve the reliability of the combination of the degradable bioactive material 5 and the intramedullary nail body, the guide pin hole 1 at the proximal end of the intramedullary nail is expanded by 3 mm in the radial direction of the intramedullary n...

example 3

[0028] This embodiment is a specific embodiment in which both the distal locking nail hole 3 and the proximal locking nail hole 4 of the intramedullary nail are provided with a degradable bioactive material 5 (polylactic acid). see Figure 7 and Figure 8 , the structural shape of the proximal locking nail hole 4 and the distal locking nail hole 3 and the manufacturing method of the reserved hole 6 are the same as in Example 2, the difference is that the distal locking nail hole 3 and the proximal locking nail hole 4 places The diameter of the guide pin hole 1 does not expand into the intramedullary nail body. Other preparation methods can be implemented with reference to Example 1. The mechanism of the technical solution described in this embodiment providing stress stimulation to the fracture and the technical effect it can achieve can be easily understood by the public by using the known biomechanical principles in conjunction with the accompanying drawings.

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Abstract

The present invention discloses a controllable micromovement interlocked intramedullary nail. Said interlocked intramedullary nail includes an intramedullary nail, and it is characterized by that a degradable bio-active material for covering, supporting and locking said intramedullary nail is set in distal nail-locking hole or proximal nail-locking hole or in distal and proximal nail-locking hole, after the degradable bio-active material is degraded, between the intramedullary nail and nail-locking hole an axial gap is existed. Said invention can further raise the fracture union effect.

Description

Technical field: [0001] The invention relates to an appliance for bone setting, in particular to an intramedullary bone setting device, in particular to a micro-motion interlocking intramedullary nail. Background technique: [0002] At present, interlocking intramedullary nails are commonly used at home and abroad. Because of the addition of proximal and distal interlocking screws, the internal fixation has a long working length, reliable fixation, good anti-rotation and longitudinal stability. Prevents shortening of fractures and restores the advantage of limb length. However, when it is applied to the treatment of fractures, it is easy to produce stress shielding of the fixed bone, resulting in osteoporosis, slow formation of callus, small amount of callus, slow fracture healing, and easy refracture after removal of the fixation. Aiming at the problem of interlocking intramedullary nails, Wang Jiaqi et al. used dynamic fixation method for reoperation, and removed the inte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B17/72A61B17/86
Inventor 李鉴轶赵卫东
Owner SOUTHERN MEDICAL UNIVERSITY
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