Total temporomandibular joint prosthesis

Abstract

The invention discloses a total temporomandibular joint prosthesis. The total temporomandibular joint prosthesis comprises a mandible prosthesis, a condyloid process head prosthesis, a glenoid fossa bottom prosthesis and a glenoid fossa fossa prosthesis; the mandible prosthesis comprises a head part, a neck part and a lifting and supporting fixing part; the condyloid process head prosthesis is of a hollow ball body, and the hollow part is in a shape of a circular platform in match with the head part of the mandible prosthesis, and thus the head part of the mandible prosthesis is perfectly connected with the condyloid process head prosthesis; the glenoid fossa bottom prosthesis comprises a zygomatic arch fixing part and a connecting part; the glenoid fossa fossa prosthesis is cuboid, and clamping strips are arranged at the left side edge and the right side edge of the glenoid fossa fossa prosthesis; the clamping strips are connected with clamping slots in the fossa surface at a connecting part of the glenoid fossa bottom prosthesis by an inserting and drawing manner; the bottom surface of the glenoid fossa fossa prosthesis is a circular concave surface and is clung to the condyloid process head prosthesis. With the adoption of the total temporomandibular joint prosthesis, the postoperative wound can be reduced; the stability is high; the characteristic that the glenoid fossa of Chinese people is deeper than that of occidental; the articular tubercle is avoided grinding which leads to damage to basis cranii in operation.

Description

technical field [0001] The invention belongs to medical equipment, and more specifically relates to a total temporomandibular joint prosthesis. Background technique [0002] Temporomandibular joint (TMJ) disease is a common and frequently-occurring disease, and its incidence rate can reach more than 28% in foreign countries. It is one of the most common diseases in oral and maxillofacial surgery, mainly including TMJ structural disorder, bone joint diseases, infectious arthritis, joint developmental diseases and their corresponding maxillofacial deformities, joint fractures, ankylosis, dislocations, tumors, etc. The clinical manifestations are mainly spontaneous pain in the joint area, limited mouth opening, joint murmur, occlusal disorder, abnormal mandibular movement and dysfunction, which seriously affect the patient's chewing, language and other functions, and even endanger the patient's life. [0003] For middle and advanced TMJ osteoarthropathy, severe inflammatory or...

AI Technical Summary

Problems solved by technology

Since the standard prosthesis is designed according to the jaw shape of Europeans and Americans, the following design deficiencies are found in clinical application: ① The prosthesis cannot be well matched with the bone shape of the operation area, so the prosthesis itself is easy to Bending and deformation may increase the risk of bone resorption. In order to make it fit the jaw as much as possible during the operation, a large amount of bone needs to be ground (that is, "cutting the foot to fit the shoe"), which will inevitably increase trauma and affect the treatment effect; ② Glenoid prosthesis fixation The shank is designed with two rows of screw holes, but because the lateral surface of the root of the zygomatic arch in Chinese is narrow, only one row of screws can be fixed, resulting in poor retention, which is a design deficiency; ③The screw holes of the mandibular fixation plate Too low is also one of the reasons for poor retention; ④ Due to wear and metal fatigue after long-term use, it is necessary to remove all the original implants when replacing the joint, resulting in bone loss and difficulty in re-repositioning

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