Sleeve Type Ultra-thin Bone Fixation Pin

Abstract

A sleeve-type superfine diameter osteofixation needle (100), comprising a power assisting sleeve (116, 214) and a superfine diameter osteofixation needle (102, 202) disposed in the power assisting sleeve (116, 214), one end of the power assisting sleeve (116, 214) being provided with an adapter seat (112, 212) to connect to a rotor of a drive electric motor (122), and another end being provided with a detachable rigid connection apparatus, the power assisting sleeve (116, 214) being fixed to the osteofixation needle (102, 202) by means of the rigid connection apparatus, and the rigid connection apparatus limiting extension of a needle tip (104) of the osteofixation needle (102, 202) from the power assisting sleeve (116, 214) to a set length. Starting the electric motor (122) can cause the electrically driven osteofixation needle (100) to enter a bone by means of percutaneous self-tapping drilling, and after the needle tip (104) of the osteofixation needle (102, 202) extending from the power assistance sleeve (116, 214) penetrates a target bone, detaching the rigid connection apparatus from a distal end of the power assistance sleeve (116, 214), removing the power assistance sleeve (116, 214) from the osteofixation needle (102, 202); finally, screwing into an anchor bone matrix by means of needle-holding forceps gripping a screw thread section (106) of a back part of the osteofixation needle (102, 202). Feasibility of percutaneous anchor needle puncturing is realized for small animal bone fracture and bone malformation models and clinical osteofixation of small bone breaks in specific parts, including hand and foot; the method is simple and convenient, time-saving and efficient, causes little surgical trauma, and needle anchoring stability is reliable.

Description

technical field [0001] The invention relates to a medical device, specifically for the establishment of experimental animal fracture and segmental bone defect models, as well as for the purpose of medical repair of fracture bone defects in specific parts such as hands and feet in clinical medicine. And clinical hands, feet, wrists, ankles and other small bones and multi-joint tendons and nerve-intensive parts of the bone environment to implement bone fixation special surgical instruments. Background technique [0002] External fixation techniques for fractures and bone defects are widely used in orthopedics and bone trauma repair operations. However, laboratory small animal orthopedic procedures, such as tibial external fixation of the lower leg in mice, are limited by the lack of bone fixation instruments suitable for use in the small tibial environment in the study of bone-based disciplines in human life sciences. This directly makes it difficult for researchers to use ex...

AI Technical Summary

Problems solved by technology

However, the current reality faced by the laboratory is that the toughness of the tibia means that smaller needles (eg, 30G gauge, 0.30mm diameter) may bend or become weak when drilling into bone tissue and fail to penetrate the bone.

Therefore, we have to risk iatrogenic fractures that may be caused by small tibial bone punctures, and are forced to use larger and stronger bone puncture needles; Can replace a new puncture needle and continue to drill, and often need several needles in succession to complete the drilling and puncture; this method can only be operated on young animals whose bone tissue is not very tough

In addition, because the puncture needle is too thin, it can only be carefully drilled into the bone by hand, and cannot be driven by a motor.

Repeating the time-consuming manual drilling of multiple needles increases the risk of surgical trauma and infection; this method is very prone to needle failure, iatrogenic fractures, or loosening of implanted needles; finally, this operation requires well-trained Highly skilled professionals often need to invest a lot of training and learning time, which greatly increases the overall cost of animal experiments

[0006] Similarly, in the fixation surgery for tension band and stress bone fracture reduction and bone defect repair in the hands, feet, wrists, ankles and other parts of clinical medicine, because the bones in these positions are small and the tendon nerves are densely distributed, traditional steel plates and The screw internal fixation technique has a large surgical trauma, and the stability of small bone blocks or bone fragments is poor for a certain period of time. The probability of local nerve and extensor tendon damage during fixation is high; it affects the effect of surgical fixation, and the time for functional exercise is delayed, especially after bone healing. Need to perform another skin-opening and invasive surgery to remove the metal fixture

These deficiencies have led to more stringent, time-consuming and expensive professional technical requirements for hand, ankle, wrist and ankle trauma repair.

However, there are two obvious complications with the use of Kirschner wires, namely, the protruding ends of the Kirschner wires irritate the surrounding soft tissue and the displacement of the Kirschner wires.

In addition, in actual operation and application, the minimum diameter of the electric drill that can penetrate into the bone Kirschner wire is 0.8mm. If the diameter is too small, the needle body will be too thin to be held by electric tools, or the needle body will be too soft and easy to bend and cannot be powered. drill into bone

Therefore, the traditional Kirschner wire anchor fixation method, the soft tissue irritation caused by the protruding tail end and the disadvantages of easy slippage caused by needle withdrawal limit the wide application of Kirschner wire technology in the field of clinical bone fixation.

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