Means for taking-out broken nail from inner-bone

Abstract

An intrabony broken nail taking-off device is composed of main tubular body, front saw end, tail end, buffering node, force releasing window, push rod, screw bolt and nut. Its advantages are convenient operation, simple structure, and no damage to tissue and bone.

Description

Technical field [0001] The invention relates to a medical instrument for orthopedics, which is an instrument for taking out broken nails in bone. Background technique [0002] In traditional clinical orthopedic surgery for broken nails, because the broken nails remaining in the bone are tightly combined with the bone tissue, in order to remove the broken nails remaining in the deep part of the cortical bone, usually, the operation needs to be performed on the bone tissue with high hardness. Perform invasive operations such as splitting, chiseling, picking, etc., and reach a certain range and depth, expose a certain length of the residual broken nail in the bone, and leave a certain gap between the broken nail and bone tissue before the instrument can be penetrated and taken out. Bone defects are often caused; and some broken nails are often stuck in the deep bone compact around the fracture for a long time due to the special location and extremely difficult operation to remo...

AI Technical Summary

Problems solved by technology

[0002] In traditional clinical orthopedic surgery for broken nails, because the broken nails remaining in the bone are tightly combined with the bone tissue, in order to remove the broken nails remaining in the deep part of the cortical bone, usually, the operation needs to be performed on the bone tissue with high hardness. Perform invasive operations such as splitting, chiseling, picking, etc., and reach a certain range and depth, expose a certain length of the residual broken nail in the bone, and leave a certain gap between the broken nail and bone tissue before the instrument can be penetrated and taken out. Bone defects are often caused; and some broken nails are often stuck in the deep bone compact around the fracture for a long time due to the special location and extremely difficult operation to remove; Excessive force can easily cause too much damage to the bone tissue around the broken nail, and the wound edge and wall are uneven, and due to the vibration generated when chiseling, splitting, and deboning the tissue, the force bearing at both ends of the fracture is uneven, and it is easy to cause fractures The gap and surrounding callus and other reparative new tissues fall off, the fracture fragments shift, and even split fractures around the broken nail may occur; some broken nails are due to irregular operations, fixing the bone nail on the fracture line or Movable broken nails are formed on the easily movable fracture fragments, and the stumps of the broken nails remain around the fracture gap, which often easily lead to malunion of fractures, delayed bone union, nonunion or even osteonecrosis; during operation, Such broken nails are prone to axial displacement, and improper operation can easily lead to complications such as bone marrow tissue destruction and fat liquefaction. If the surgical field is exposed for too long, it is easy to be infected and form osteomyelitis.

[0003] Utility model patent 00237495.1 discloses a "trephine type residual nail remover", but this technical solution has: 1. The vibration force of the electric drill impacts or vibrates around the fracture, so that the repairing bone tissue is removed during the nail removal process. Loosening or falling off in the center; the amplitude generated when the extractor drill cuts into the bone tissue causes the main body and the motor of the electric drill to resonate and deform; 2. The wall thickness of the main body is only 0.5mm, and it is difficult to overcome the resistance of the cortical bone when entering the bone; 3. The "upper end of the main body" of the device emphasizes the "two chutes split apart" and further destroys its overall strength, making it easy to distort and deform when entering the cortical bone, making it impossible to complete the whole process of removing the residual nail; 4. Inside the chute (i.e. the inner main body) without a push rod and its corresponding devices. It has been proved by clinical experiments and actual operations that the bone tissue brought out when the residual nail is taken out is closely connected with the tube wall and it is difficult to push it out without a push-out device; 5. The overall setting lacks restrictions The device penetrates deep into the bone, and it is very easy to damage the contralateral extrabone tissue when removing the nail.

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