CN213346174U

CN213346174U - Self-positioning type temporomandibular joint prosthesis

Info

Publication number: CN213346174U
Application number: CN202022123398.1U
Authority: CN
Inventors: 杨驰; 郑吉驷; 焦子先; 陈敏洁; 姜闻博
Original assignee: Ninth Peoples Hospital Shanghai Jiaotong University School of Medicine
Current assignee: Ninth Peoples Hospital Shanghai Jiaotong University School of Medicine
Priority date: 2020-09-24
Filing date: 2020-09-24
Publication date: 2021-06-04
Anticipated expiration: 2030-09-24

Abstract

A from location type temporomandibular joint false body, false body includes from top to bottom at least: a connected articular head member and mandibular handle member; the lower jaw handle piece comprises a lower jaw handle body, a front wing plate and a rear wing plate, and the upper end of the lower jaw handle body is connected with the joint head piece; one side of the prosthesis facing the human face after being implanted is taken as the front side, the front wing plate is arranged at the upper part of the front side of the mandible handle body, and the front wing plate can be individually attached to the sigmoid notch bone surface of the human body; the rear wing plate is arranged on the lower portion of the rear side of the mandible handle body and can be individually attached to the rear edge bone surface of the mandible of a human body. The front and rear wing plates of the prosthesis are individually attached to the lower jaw lifting support and the lower jaw rear edge, and the implantation position of the prosthesis is accurately determined through front and rear bidirectional self-positioning, so that the inter-jaw ligation in the operation is avoided, and the risk of infection of the prosthesis is greatly reduced. The prosthesis has the advantages of small design, reduced operation wound, shortened operation, and reduced operation difficulty.

Description

Self-positioning type temporomandibular joint prosthesis

Technical Field

The utility model relates to the field of medical equipment, concretely relates to from location type temporomandibular joint false body.

Background

The temporomandibular joint is the only joint of the maxillofacial region which is linked left and right, has rotary and sliding motions, and is one of the most complex joints of the human body in anatomy and motion. Temporomandibular joint disease is a common disease and frequently encountered disease, which is mainly manifested by joint area pain, restricted mouth opening, occlusion disorder, mandibular movement and dysfunction, etc., which seriously affects the functions of chewing, language, etc. of patients and even endangers the lives of patients. The affected joints need to be resected, such as late temporomandibular joint osteoarthropathy, severe idiopathic condylar absorption, ankylosis, comminuted fracture, partial joint tumors and the like, and the TMJ is reconstructed by utilizing autologous or allogeneic tissues so as to recover the form and the function of the joint to the maximum extent.

A Total Temporomandibular joint prosthesis (Total Temporomandibular joint prosthesis, full TMJ prosthesis) is one of the effective methods to restore the morphology and function of this joint. Especially has good clinical treatment effect on the lesions of middle and late TMJ osteoarthropathy, idiopathic condylar absorption, ankylosis, autologous bone transplantation failure, partial joint tumors, tumor-like tumors and the like. Currently, international mainstream products are standard Zimmer Biomet and custom TMJ Concepts; these 2 prostheses, respectively, have had little domestic application because of their inadequate fit to the Chinese joint structure and their high price (7-15 million RMB/side). The product of patent CN 205626192U, clinical preliminary tests prove its good safety and effectiveness. However, the three types of prosthesis are designed in a plate shape, and although TMJ Concepts and domestic prostheses are individually designed, the accurate position of the mandible is still difficult to accurately determine in the operation.

SUMMERY OF THE UTILITY MODEL

In view of the above-mentioned drawbacks of the prior art, it is an object of the present invention to provide a self-positioning temporomandibular joint prosthesis. The utility model discloses a self-align effect in its art can be realized to the false body for the false body is implanted more swiftly, accurate and high-efficient.

Self-align type temporomandibular joint false body, from top to bottom include at least: a connected articular head member and mandibular handle member; the lower jaw handle piece comprises a lower jaw handle body, a front wing plate and a rear wing plate, and the upper end of the lower jaw handle body is connected with the joint head piece; one side of the prosthesis facing the human face after being implanted is taken as the front side, the front wing plate is arranged at the upper part of the front side of the mandible handle body, and the front wing plate can be individually attached to the sigmoid notch bone surface of the human body; the rear wing plate is arranged on the lower portion of the rear side of the mandible handle body and can be individually attached to the rear edge bone surface of the mandible of a human body.

As mentioned above, the utility model discloses a self-align type temporomandibular joint false body has following beneficial effect:

self-align type temporomandibular joint false body can effectively restore the normal anatomical structure of the condyle process, resume functions such as patient's chewing, speech, motion. The front wing plate and the rear wing plate are individually attached to the lower jaw lifting support and the lower jaw rear edge, the prosthesis implantation position is accurately determined through front and rear bidirectional self-positioning, jaw ligation in an operation is avoided, and the risk of prosthesis infection is greatly reduced. The rough or porous surface structure on the inner side of the prosthesis is beneficial to quickly and firmly forming osseointegration with bones, and the long-term stable effect of the prosthesis is maintained. The prosthesis has the advantages of small design, reduced operation wound, shortened operation, and reduced operation difficulty.

Drawings

Fig. 1 shows a front view of a mandible handle of a self-positioning temporomandibular joint prosthesis according to an embodiment of the invention.

Fig. 2 shows a rear view (medial side) of the mandibular stem component of the self-positioning temporomandibular joint prosthesis according to an embodiment of the invention.

Fig. 3 shows a view of the joint head of a self-positioning temporomandibular joint prosthesis according to an embodiment of the invention.

Fig. 4 shows a structural diagram of a self-positioning temporomandibular joint prosthesis according to an embodiment of the invention.

Fig. 5 shows a structural view (medial side) of a self-positioning temporomandibular joint prosthesis according to an embodiment of the invention.

Description of the element reference numerals

1 Joint head piece

2 lower jaw handle piece

21 mandible handle body

22 front wing plate

23 rear wing panel

3 nail hole

a front side

b rear side

Detailed Description

The following description is provided for illustrative purposes, and other advantages and features of the present invention will become apparent to those skilled in the art from the following detailed description.

Please refer to fig. 1 to 5. It should be understood that the structure, ratio, size and the like shown in the drawings attached to the present specification are only used for matching with the content disclosed in the specification, so as to be known and read by those skilled in the art, and are not used for limiting the limit conditions that the present invention can be implemented, so that the present invention has no technical essential meaning, and any structure modification, ratio relationship change or size adjustment should still fall within the scope that the technical content disclosed in the present invention can cover without affecting the function that the present invention can produce and the purpose that the present invention can achieve. Meanwhile, the terms such as "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for convenience of description, and are not intended to limit the scope of the present invention, and changes or adjustments of the relative relationship thereof may be made without substantial technical changes, and the present invention is also regarded as the scope of the present invention.

As shown in fig. 4 and 5, an embodiment of the present invention provides a self-positioning temporomandibular joint prosthesis, which at least comprises, from top to bottom: a connected articular head piece 1 and mandibular handle piece 2; as shown in fig. 1, the mandibular handle member 2 comprises a mandibular handle body 21, a front wing plate 22 and a rear wing plate 23, the mandibular handle body 21 being connected at its upper end to the articular head member 1; the side, facing the human face, of the implanted prosthesis is taken as the front side, the front wing plate 22 is arranged at the upper part of the front side of the mandible handle body 21, and the front wing plate can be individually attached to the sigmoid notch bone surface of the human body; the rear wing plate 23 is arranged at the lower part of the rear side of the mandible handle body 22, and the rear wing plate 23 can be individually attached to the posterior mandible edge bone surface of a human body.

The front wing plate plays a role in positioning the front end of the prosthesis automatically, and the rear wing plate plays a role in positioning the rear end of the prosthesis automatically; the front wing plate and the rear wing plate are individually attached to the mandible lifting support and the mandible rear edge, and the prosthesis implantation position can be accurately determined through front-back bidirectional self-positioning.

Optionally, the length of the mandible handle body 21 is 40-60 mm; and/or the width is 10-20 mm. Small volume and convenient operation.

The length of the mandible handle body 21 refers to the distance from the joint of the mandible handle body 21 and the joint head piece to the end of the mandible handle body. The width direction of the mandible handle body 21 is vertical to the length direction of the mandible handle body.

Optionally, the front wing panel 22 has a length of 5-10mm and/or a width of 5-10 mm. The positioning function is convenient to realize.

The longitudinal direction of the front wing plate 22 is the same as the longitudinal direction of the mandible handle body 21. The width direction of the front flap 22 is perpendicular to the longitudinal direction of the front flap 22.

Alternatively, the front panel may have a taper. The front wing plate extends in the direction far away from the mandible handle body, and the side surface of the front wing plate is uniformly contracted towards the central axis direction of the front wing plate.

Optionally, the length of the rear wing plate 23 is 10-15 mm; and/or a width of 5-10 mm. The positioning function is convenient to realize.

The longitudinal direction of the rear wing plate 23 is the same as the longitudinal direction of the mandible handle body 21. The width direction of the rear flap 23 is perpendicular to the length direction of the rear flap 23.

Optionally, as shown in fig. 2, one surface of the lower jaw handle 2, which is attached to the autogenous bone, is an inner side surface, and the inner side surface of the lower jaw handle 2 is a rough surface or is provided with a porous structure layer. Is favorable for forming firm osseointegration with the bone.

The thickness of the porous structure layer is 0.5-1 mm. The porous structure layer comprises a plurality of blind holes, and the pore size of the blind holes is 400-800 mu m.

The inner side surface of the lower jaw handle member 2 is a rough surface, which means that the inner side surface of the lower jaw handle member 2 is an uneven surface, and Ra is 1.5-3.0 μm.

Optionally, the thickness of the porous structure layer is 0.5-1 mm.

Further, a nail hole 3 is formed in the lower jaw handle body 21. For fixation.

Optionally, the number of the nail holes 3 on the mandible handle body 21 is 5-7.

In one embodiment, the front wing panel 22 is provided with nail holes.

Optionally, the number of the nail holes 3 on the front wing plate 22 is 1-2.

The joint head piece 1 can move relative to a human body glenoid fossa or a glenoid prosthesis implanted into a human body, and the structure and the motion function of the temporomandibular joint are restored.

The joint head piece is of a hollow cylindrical structure. May be cylindrical.

The diameter of the articular head piece may be 8-12 mm; the height may be 10-14 mm.

The hollow structure can reduce weight. The connecting end of the joint head piece and the lower jaw handle piece is taken as the bottom end, the bottom surface area of the hollow cavity of the joint head piece is larger than the area of the upper surface of the lower jaw handle piece, and the taper can be 8-10 degrees

The lower jaw handle piece is connected with the end part of the lower jaw handle piece in a nesting mode. A taper connection may be utilized.

By "individualized" is meant herein that the autogenous bones of the user differ in shape, and the prosthesis or parts of the prosthesis can be adapted to different users. Alternatively, the autologous bone of the user may be scanned by CT scanning or the like, followed by building a three-dimensional model and designing a prosthesis prototype, which is obtained by 3D printing and 5-axis finishing, or a component of the prosthesis.

When in use, the prosthesis is placed at the lower jaw lifting position of a human body through the front wing plate and the rear wing plate, and then the bone nail is driven into the nail hole for fixing.

The above embodiments are merely illustrative of the principles and effects of the present invention, and are not to be construed as limiting the invention. Modifications and variations can be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which may be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.

Claims

1. A self-positioning temporomandibular joint prosthesis, characterised in that it comprises, from top to bottom, at least: a joint head piece (1) and a lower jaw handle piece (2) which are connected; the lower jaw handle piece (2) comprises a lower jaw handle body (21), a front wing plate (22) and a rear wing plate (23), and the upper end of the lower jaw handle body (21) is connected with the joint head piece (1); one side of the prosthesis facing the face of a human body after being implanted is taken as the front side, the front wing plate (22) is arranged at the upper part of the front side of the mandible handle body (21), and the front wing plate can be individually attached to the sigmoid notch bone surface of the human body; the rear wing plate (23) is arranged at the lower part of the rear side of the mandible handle body (21), and the rear wing plate (23) can be individually attached to the rear edge bone surface of the mandible of a human body.

2. The self-positioning temporomandibular joint prosthesis according to claim 1, characterised in that the length of the mandibular stem body (21) is 40-60 mm; and/or the width is 10-20 mm.

3. The self-positioning temporomandibular joint prosthesis according to claim 1, characterised in that the anterior wing plate (22) has a length of 5-10mm and/or a width of 5-10 mm.

4. The self-positioning temporomandibular joint prosthesis according to claim 1, characterised in that the posterior wing plate (23) has a length of 10-15 mm; and/or a width of 5-10 mm.

5. The self-positioning temporomandibular joint prosthesis according to claim 1, characterised in that the side of the mandibular stem member (2) that is intended to engage the autogenous bone is the medial side and the medial side of the mandibular stem member (2) is a rough surface or provided with a porous structural layer.

6. The self-positioning temporomandibular joint prosthesis of claim 5, where the thickness of the porous structural layer is between 0.5 and 1 mm.

7. The self-positioning temporomandibular joint prosthesis according to claim 1, characterised in that the mandibular stem body (21) is provided with a nail hole (3).

8. The self-positioning temporomandibular joint prosthesis according to claim 7, characterised in that the number of peg holes (3) on the mandible handle body (21) is 5-7.

9. The self-positioning temporomandibular joint prosthesis of claim 1 where the anterior wing plate (22) is provided with peg holes.

10. The self-positioning temporomandibular joint prosthesis according to claim 9, characterised in that the number of peg holes (3) on the anterior wing plate (22) is 1-2.