A Combined Spiral Reinforced Bone Anchor

Abstract

The invention discloses a combined spiral reinforced bone anchor, which belongs to the field of medical instruments. The combined spiral-reinforced bone anchor of the present invention includes two parts: an anchor and a helical screw. The anchor includes an anchor head and an anchor main body. The helical screw includes a helical main body. head with a tail for helical screw rotation implantation at the rear. The present invention organically combines the anchor and the helix. When using the anchor, the anchor is driven in first, and then the helix is ​​screwed in. The helix is ​​used to provide the holding force of the anchor in the bone. It can effectively disperse stress and cause little damage to bone; in addition, the distance and quantity of anchor implantation are limited, and the anchor implantation density can be higher, which is especially suitable for tendon suture fixation in patients with osteoporosis ; and if the anchor is loose, it can be reimplanted in situ by replacing the screw with a larger diameter, and the operation is simpler and more flexible.

Description

technical field [0001] The invention relates to a medical bone anchor, more specifically to a combined helical reinforced bone anchor, in particular to a minimally invasive suture anchor for repairing tendon damage. Background technique [0002] Complete or partial separation of ligaments, tendons, or other soft tissues from the bone to which they are attached is a relatively common injury. Partial separations can usually be treated conservatively with satisfactory results, but complete separations require surgical treatment to complete the soft tissue repositioning of the bone. attached. A suture anchor is a miniature device used to connect soft tissues such as tendons and ligaments to bones in surgical operations. It can fix the damaged tendon stump to bone tissue to restore the normal structure and joint function of the tendon. Through tendon-bone healing final fixed purpose. [0003] The process of tendon-bone healing requires a certain contact area and firm contact st...

AI Technical Summary

Problems solved by technology

However, the anchors in the prior art often encounter the following problems when they are used: 1. The holding force of the anchor is weak, and the anchor is often loosened or pulled out during or after the operation, resulting in failure of fixation. Cases of osteopenia or osteoporosis; 2. When the anchors are implanted in the bone, a certain distance between the anchors needs to be kept, otherwise the fixation strength will be affected, which limits the number of anchors implanted; 3. Once the anchors occur After loosening and pulling out, it is difficult to re-implant in situ, and the anchor needs to be re-implanted at a position far away from the original hole, which not only increases the difficulty of operation, but also seriously affects the reliability of intraoperative fixation; 4. Anchor fixation more bone damage

The above-mentioned patent application designs the bone screw as a helical structure, which to a certain extent solves the shortcomings of the traditional thread structure or protruding wing-shaped anchors such as the limited implantation position and quantity, and more bone damage. However, the bone screw The implanted part is a spiral filament-like structure, and its anchoring strength is low. The end of the bone screw close to the bone plate or suture has a large degree of freedom of deformation, which affects its anchoring strength; and the holding force of the implanted part is from outward to outward. The inside changes. Generally speaking, the holding force on the inside is greater, while the holding force on the outside is reduced due to the low local strength of the helical filament structure. Therefore, it is easy to loosen the bone on the outside during use, especially for For patients with osteopenia or osteoporosis, the anchoring strength needs to be further improved

Images