Adjustable cylindrical bone taking device for femoral head necrosis

Abstract

The invention discloses an adjustable cylindrical bone taking device for femoral head necrosis. The adjustable cylindrical bone taking device comprises an annular bone taking drill; a hollow bad bone scraping rod is arranged in the annular bone taking drill in a sleeved mode; a bone scraping limiting box is installed outside the hollow bad bone scraping rod; an opening control switch and a position adjusting control switch are installed outside the bone scraping limiting box; two bone scraping knives are installed at the bottom end of the hollow bad bone scraping rod; one corners of the top ends of the two bone scraping knives are connected through a connecting ring; position adjusting sawteeth are installed outside the bone scraping knives; a position adjusting gear is installed inside the hollow bad bone scraping rod; and the bone scraping knives are controlled by the opening control switch to open and rotate to scrape the necrotic femoral head after reaching a necrotic area through the annular bone taking drill, and then the position adjusting gear is controlled by the position adjusting control switch to be matched with the position adjusting sawteeth to adjust the bone scraping range of the bone scraping knives so as to adapt to uncertainty of the size and position of the osteonecrosis area, and dead bones in the femoral head are thoroughly and effectively removed.

Description

technical field [0001] The invention belongs to the technical field of medical devices, and in particular relates to an adjustable cylindrical bone extractor for necrosis of the femoral head. Background technique [0002] Femoral head necrosis, also known as avascular necrosis of the femoral head, is one of the most common clinical orthopedic patients. It mostly occurs in young and middle-aged men aged 30 to 50. For patients with necrosis, if treatment measures are not taken as soon as possible, it will lead to femoral head collapse or osteoarthritis. Finally, artificial hip replacement has to be performed. Early minimally invasive treatment of femoral head necrosis is the current trend of femoral head necrosis treatment. When femoral head core decompression is used to treat femoral head necrosis, a bone tunnel must be opened in the femoral head, but the opening of the bone tunnel is too small, coupled with the physiological and anatomical characteristics of the femoral head...

AI Technical Summary

Problems solved by technology

[0002] Femoral head necrosis, also known as avascular necrosis of the femoral head, is one of the most common clinical orthopedic patients. It mostly occurs in young and middle-aged men aged 30 to 50. For patients with necrosis, if treatment measures are not taken as soon as possible, it will lead to femoral head collapse or osteoarthritis. Finally, artificial hip replacement has to be performed. Early minimally invasive treatment of femoral head necrosis is the current trend of femoral head necrosis treatment. When femoral head core decompression is used to treat femoral head necrosis, a bone tunnel must be opened in the femoral head, but the opening of the bone tunnel is too small, coupled with the physiological and anatomical characteristics of the femoral head, resulting in the removal of the necrotic femoral head. It needs to be repeated many times, and it is difficult to remove it completely. Most of the existing operating instruments for scraping necrotic femoral head are fixed and enlarged structures. The area of ​​the necrotic femoral head is uncertain. To completely and effectively remove the sequestrum in the femoral head, the curettage area should be much larger than the area of ​​the necrotic femoral head, which increases the need for follow-up treatment. Difficulty, it will also delay the patient's recovery, increase the cost of treatment and the risk of recovery or recovery

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