Miniature external metacarpus and phalanx fixation support

Abstract

In order to find a simple and effective treatment method for the metacarpal and phalanx fractures of the hand, especially the open fractures near the joints and combined with local trauma and contamination, the present invention designs a miniature metacarpal and phalanx external fixation bracket, which includes two clamping blocks, namely clamping Block 1 and clamping block 2, the two clamping blocks are connected by a connecting rod; the clamping block 2 is provided with a through hole, and one end of the connecting rod extends into the clamping block 1, and the vertical direction of the through hole of the clamping block 2 A screw hole is provided, and the screw hole communicates the through hole with the outside of clamping block 2, and a compression screw is screwed into the screw hole to fix the connecting rod. By fixing the holding force against the bone, the mechanical reset and strong fixation force of the external connecting rod is transmitted to the bone in the body, so that it can be moved or fixed according to the needs of fracture or joint reset. It has the characteristics of small trauma, stable and reliable fixation.

Description

technical field [0001] The present invention relates to a fracture fixation device, in particular to an external fixation device that can be used for palm and phalanx fractures of human hands. Background technique [0002] Metacarpal and phalanx fractures are the result of direct violence from hand trauma. They have a high incidence in fractures and are often accompanied by combined injuries of tendons, nerves, and blood vessels. Metacarpal and phalanx fractures have the common characteristics of tubular fractures of limbs, and there are also Its particularity is that the metacarpal and phalanx bones are short, participate in many joints, have high functional requirements, have a great impact on the shape, and the tissue structure around the bone is complex. Small displacement and angulation after fracture will affect the function of the hand. [0003] Therefore, the treatment of complex metacarpal and phalanx fractures involving the articular surface has always been a diffi...

AI Technical Summary

Problems solved by technology

However, for metacarpophalangeal fractures, especially near joints and open fractures with local trauma and contamination, there is currently no effective fixation method. For closed and stable fractures, external fixation with plaster or splint after manual reduction is often used; After reduction of open and unstable fractures, treatment methods such as Kirschner wire and plate internal fixation are used

[0004] The maximum recovery function has always been the direction of efforts in the treatment of metacarpal and phalanx fractures. It has been found in clinical practice that some patients with metacarpal and phalanx fractures have soft tissue embedded due to the interference of flexor and extensor tendons, and closed reduction is difficult. The fixation time is long and the functional recovery is not good

Among them: Internal fixation with Kirschner wires for the treatment of metacarpal and phalanx fractures is suitable for fractures of the metacarpal head and transverse and short oblique fractures of the middle and proximal phalanges. , the internal fixation is easy to remove, but it is prone to loosening and slipping, and cannot achieve reliable internal fixation

When a single Kirschner wire is fixed, it is difficult to control the rotation, and the fracture ends are easy to separate. It often needs to pass through the joint for fixation, which is not conducive to early functional exercise and affects functional recovery. Cross-joint fixation can also lead to joint dysfunction; crossed Kirschner wires During fixation, although the stability is good, it can prevent rotation, but there is no pressurization effect on the fracture end, which will also affect the fracture healing, and postoperative external fixation with plaster support is easy to cause joint stiffness, malunion and nonunion, etc. Seriously affect the rehabilitation of hand function, and because the medullary cavity is small, it is difficult to grasp the angle of needle insertion, and it is difficult to perform needle insertion during surgery, which requires high technical skills for the surgeon

[0005] The micro-plate is thin, small and strong, and it is used for internal fixation of metacarpal and phalanx fractures, which basically meets the three requirements proposed by the International Society of Internal Fixation (AO) for the treatment of metacarpal and phalanx fractures: ①Strive for anatomical reduction; ②Lightweight and firm fixation; ③Early activities and functional exercises; however, due to the small size of the palm and phalanx, the miniature steel plate sometimes leads to tendon adhesion, bone nonunion, soft tissue damage, and exposed steel plate due to the small size of the palm and phalanx, and affects the flexion and extension function. The damage to the blood supply of the fracture should be minimized, repeated drilling and tapping should be avoided, and doctors are required to have certain surgical skills; after the fracture heals, it is necessary to re-cut and remove the plate and screw, which is more troublesome than other fixation methods, and the medical cost is higher than that of Kirschner wires. Internal fixation is expensive and unaffordable for some patients

[0006] When Kirschner wires and steel plates cannot be effectively fixed, the traditional treatment plan can only be fixed with a plaster cast, which affects hand function, and is not conducive to dressing changes, flap coverage, and repair of tendon and bone defects.

[0007] The current fracture reduction and fixation method often requires two-stage joint fusion because the fingers cannot be exercised early after surgery, or because of traumatic arthritis joint pain, so a new reduction and fixation device or method is needed to achieve more Satisfactory treatment and functional restoration effect

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