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Cross screw system supported and fixed on femoral neck cortical bone

A technology for fixing screws and cortical bone, which is applied in the field of medical devices to achieve the effect of good bending resistance and strong pullout resistance

Active Publication Date: 2021-10-15
WUXI NO 9 PEOPLES HOSPITAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the deficiencies in the performance of existing internal fixation devices for femoral neck fractures, especially the shortcomings of existing internal fixators such as the inability to use screws for patients with obvious osteoporosis, and based on the characteristics of the femoral neck bone anatomy and existing research results, The invention provides a cross screw system supported and fixed on the cortical bone of the femoral neck. The system has strong compression resistance, bending resistance, shear resistance, rotation resistance and pull-out resistance, and its mechanical strength and stability are similar to those of hollow screws. Combined with reconstruction plate internal fixation, it is superior to the existing single internal fixator, and can obtain reliable stability even for patients with obvious osteoporosis; it also has a sliding compression effect

Method used

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  • Cross screw system supported and fixed on femoral neck cortical bone
  • Cross screw system supported and fixed on femoral neck cortical bone
  • Cross screw system supported and fixed on femoral neck cortical bone

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Example 1: (fixed by two fixing screws)

[0030] The cross screw system is supported and fixed on the cortical bone of the femoral neck. The operation was carried out under X-ray fluoroscopy monitoring (C-arm X-ray machine). First, the femoral neck fracture was reduced by traction. After the fracture was confirmed to be satisfactory by anteroposterior and lateral fluoroscopy, this screw system was used for fixation. First, according to the size of the patient's bone and the position of the fracture line in the X-ray fluoroscopy image, design and select a horizontal screw with a suitable screw diameter, length and through-hole position. According to the design, it would be the best if the designed horizontal screws and fixation screws are printed by 3D printing technology before operation, which can shorten the operation time and improve the accuracy of screw implantation. Under fluoroscopy, insert the guide wire into the femoral neck as close to the upper part of the f...

Embodiment 2

[0031] Example 2: (fixed with four vertical screws)

[0032] The cross screw system is supported and fixed on the cortical bone of the femoral neck. If the patient has severe osteoporotic changes, especially the femoral neck cortical bone is very thin, on the basis of the two fixation screws in Example 1, one fixation screw is added on each side of the fracture, as in Figure 5 . Use the aimer to insert a guide pin into the groove on the right side of the first through hole of the horizontal screw, use an electric drill to ream the hole along the guide pin, measure the length of the screw (for example, 13cm), tap the thread, and select the front thread diameter of 3.2mm, A vertical screw with a length of 2 cm, a rear thread diameter of 7.5 mm, and a length of 12 cm was screwed in along the guide wire to fix the proximal end of the femoral neck fracture. At the same time, use the aimer to insert a guide pin into the groove of the second through hole on the right side of the h...

Embodiment 3

[0033] Example 3: (fixed with three vertical screws)

[0034] The cross screw system is supported and fixed on the cortical bone of the femoral neck. If the patient is a young patient with more postoperative activities, or is heavier or has mild osteoporotic changes, and requires greater bending resistance, on the basis of the above two vertical screw fixations, add a fixation screw to the proximal end of the fracture Fixation increases internal fixation strength, such as Image 6 . Use the aimer to insert a guide pin into the groove on the right side of the second through hole of the horizontal screw, use an electric drill to ream the hole along the guide pin, measure the length of the screw (for example, 13cm), tap, and select the front thread diameter 3.2 mm, length 2cm, rear thread diameter 7.5mm, length 12cm vertical screw, screw the screw along the guide wire to the proximal end of the femoral neck fracture for fixation.

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Abstract

The invention particularly relates to a crossed screw system supported and fixed on a femoral neck cortical bone, and belongs to the technical field of medical instruments. The crossed screw system comprises a horizontal screw and a plurality of fixing screws; a screw body of the horizontal screw is provided with a through hole, one end of each fixing screw penetrates through the through hole of the horizontal screw, the horizontal screw is supported and fixed on a cortical bone above the femoral neck, and the other end of the fixing screw is fixed on a cortical bone below the femoral neck. The system has high compression resistance, bending resistance, shearing resistance, rotation resistance and pullout resistance, the mechanical strength and stability are similar to those of internal fixation through combination of a hollow screw and a reconstruction steel plate, the femoral neck fracture internal fixator is superior to an existing single femoral neck fracture internal fixator, and even patients suffering from obvious osteoporosis can obtain reliable stability; and a sliding pressurization effect is also achieved.

Description

technical field [0001] The invention relates to a cross screw system supported and fixed on the cortical bone of the femoral neck, which belongs to the technical field of medical devices. Background technique [0002] Femoral neck fracture is a common clinical fracture and frequently-occurring disease, especially one of the most common fractures in the elderly. The fatality rate of femoral neck fracture in the elderly is 60% within 1 year after conservative treatment. Therefore, if there is no surgical contraindication for femoral neck fracture, early treatment is recommended operation treatment. For the vast majority of patients with femoral neck fractures, hip-preserving internal fixation is the first choice. Only when the patients are too old (>70-75 years old) and have severe osteoporotic changes, joint replacement is the first choice. The existing internal fixation methods for femoral neck fractures include: multiple cannulated compression screws, dynamic hip screw ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B17/74A61B17/72
CPCA61B17/744
Inventor 丁燕萍殷渠东冯锦华刘宇
Owner WUXI NO 9 PEOPLES HOSPITAL
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