A kind of anatomical bone plate of coronoid process of ulna

Abstract

The invention provides an ulna coracoid process anatomical locking plate, and belongs to the field of medical instruments and apparatuses. The ulna coracoid process anatomical locking plate has good anatomical plasticity and can narrow the incision exposure range so as to reduce iatrogenic injuries. The ulna coracoid process anatomical locking plate comprises a steel plate body with bending radian of 44+ / -2.3 degrees. The steel plate body comprises a head part and a handle part which are integrally connected. The width of the head part is larger than that of the handle part, and the width gradually decreases from the front end of the head part to the tail end of the handle part. A first locking hole is formed in the head part, near row steel needle holes are formed between the first locking hole and the front end of the head part, a slide hole, a far-end locking hole and 2-3 second locking holes which are linearly arrayed are formed in the handle part, and the tangential angle between the central vertical line of the first locking hole and the plane where the lower surface of the first locking hole is located is 63+ / -5.4 degrees. The ulna coracoid process anatomical locking plate can be used for the restoration or reconstruction process of ulna coracoid process.

Description

technical field [0001] The invention relates to the field of medical instruments, in particular to an anatomical bone plate for the coronoid process of the ulna. Background technique [0002] The coronoid process of the ulna is an important part of the semilunar notch of the proximal ulna. Its existence prevents the possibility of displacement of the distal humerus anteriorly and inferiorly and the proximal ulna posteriorly. It is the main structure to maintain joint stability. Axial biomechanical experiments on cadaver specimens by Closkey et al showed that when the coronoid fracture fragment was greater than 50%, especially when the elbow joint flexed more than 60°, the elbow joint was significantly unstable. Therefore, restoring or reconstructing the height and shape of the coronoid process is crucial to the recovery of elbow joint function. [0003] At present, only the Acumed coronoid anatomical bone plate is used for the coronoid process of the ulna. It is mainly desi...

AI Technical Summary

Problems solved by technology

[0003] Currently, only the Acumed coronoid anatomical bone plate is available for the coronoid process of the ulna. Small steel plate, such as figure 1 As shown, because there is no locking screw in the proximal row, the stability of the steel plate is poor, and the bone block can only be fixed by extrusion, which is prone to fatigue fracture in the later stage, while the distal end needs to be fixed with two screws; the other is a large steel plate , the proximal screw is too far away, making it difficult to fix the coronoid tip fracture fragment; however, the distal screws of the two above-mentioned plates must be fixed on the medial side of the ulna, such as figure 2 As shown, this will increase the exposure range of the incision and increase the iatrogenic trauma

In addition, in the process of use, sometimes the metacarpal bone plate is used to replace the anatomical bone plate of the coronoid process of the ulna, such as image 3 However, because the metacarpal bone plate has no anatomical plasticity, and the screw itself has poor anti-rotation ability when it reaches the contralateral cortex, it is easy to break and fail

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