CN103230311B - Combination type shoulder joint prosthesis - Google Patents

Abstract

The invention provides a combined shoulder joint prosthesis, comprising: a humerus stem, comprising a humerus stem distal part and a humerus stem proximal part, the humerus stem distal part and the humerus stem proximal part are detachably connected; the humerus head, Connects to the proximal humerus stem. Applying the technical scheme of the present invention, the humerus stem of the combined shoulder joint prosthesis is formed by connecting the distal part of the humerus stem and the proximal part of the humerus stem through sockets, and the proximal end of the humerus stem and the humerus stem of various specifications can be used during the operation. The distal ends are combined with each other to realize various combinations of the neck-shaft angle, retroversion angle and offset distance of the combined shoulder joint prosthesis. The effect after implantation of the shoulder joint prosthesis is more similar to the anatomical shape of the human body, which is conducive to postoperative rehabilitation.

Description

Modular shoulder prosthesis

technical field

The invention relates to the field of implanted prostheses in orthopedic surgery, in particular to a combined shoulder joint prosthesis.

Background technique

Shoulder arthritis, humeral head necrosis, and severe humeral head fractures are common shoulder orthopedic diseases. In modern medicine, the technology of performing shoulder joint replacement surgery to treat femoral head necrosis, shoulder arthritis, and humeral head fractures is quite mature. In the early cases of shoulder arthroplasty, the old humeral head and humeral stem prosthesis did not have adjustable mutual position (such as neck-shaft angle, retroversion and offset) design so that the replacement prosthesis could not achieve better anatomy performance, thereby affecting the range of motion of the shoulder joint after rehabilitation. If the mutual position adjustment between the humeral head and the humeral stem can be realized, the prosthesis can be closer to the anatomical structure of the human body, thereby further improving the postoperative effect. At present, there are several methods in the medical field for similar treatment, such as better preoperative design through imaging, more reasonable implantation angle design, selection of humeral head prosthesis with eccentric function, and so on. These technologies can achieve a certain degree of adjustment between the humeral stem and the humeral head. However, there are still few adjustable positions in these technologies, and there are not many matching specifications, which will adversely affect the range of motion of the shoulder joint after rehabilitation.

Contents of the invention

The present invention aims to provide a combined shoulder joint prosthesis to solve the problem in the prior art that the shoulder joint prosthesis has less adjustable positions and specifications, which affects the range of motion of the shoulder joint after rehabilitation.

In order to achieve the above object, the present invention provides a combined shoulder joint prosthesis, comprising: a humerus stem, comprising a humerus stem distal part and a humerus stem proximal part, the humerus stem distal part and the humerus stem proximal part are detachably Connection; humeral head, connected with the proximal part of the humerus stem.

Further, the distal part of the humerus stem is connected with the proximal part of the humerus stem through a slot.

Further, a slot is provided on the distal part of the humerus stem, and a protrusion is provided on the proximal part of the humerus stem.

Further, it also includes a set screw passing through the distal part of the humerus stem to abut against the proximal part of the humerus stem.

Further, the humeral head is connected with the proximal part of the humerus stem through a tapered hole.

Further, a truncated cone-shaped convex post is provided on the proximal part of the humerus stem, and a tapered hole that fits with the convex post is provided on the humeral head.

Further, there is an offset distance between the center of the humeral head and the extension line of the axis of the taper hole.

Further, there is an offset distance between the spherical center of the humeral head and the axis extension line of the proximal part of the humerus stem.

Further, the combined shoulder joint prosthesis is made of medical metal.

Applying the technical scheme of the present invention, the humerus stem of the combined shoulder joint prosthesis is formed by connecting the distal part of the humerus stem and the proximal part of the humerus stem through sockets, and the proximal end of the humerus stem and the humerus stem of various specifications can be used during the operation. The distal ends are combined with each other to realize various combinations of the neck-shaft angle, retroversion angle and offset distance of the combined shoulder joint prosthesis. The effect after implantation of the shoulder joint prosthesis is more similar to the anatomical shape of the human body, which is conducive to postoperative rehabilitation.

Description of drawings

The accompanying drawings constituting a part of the present application are used to provide a further understanding of the present invention, and the schematic embodiments and descriptions of the present invention are used to explain the present invention, and do not constitute an improper limitation of the present invention. In the attached picture:

Fig. 1 shows the assembled schematic diagram of the combined shoulder joint prosthesis of the present invention; And

Fig. 2 shows an exploded schematic view of the combined shoulder joint prosthesis of the present invention.

Detailed ways

It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and examples.

Referring to Fig. 1 and Fig. 2, the combined shoulder joint prosthesis of the present invention includes a humerus stem 1 and a humerus head 2, and the humerus stem 1 is connected by a humerus stem distal part 3 and a humerus stem proximal part 4 through a lug socket Formed, the humeral head 2 and the proximal part 4 of the humerus stem are locked through taper fitting.

As shown in FIG. 2 , the inner tapered surface of the humeral head 2 cooperates with the upper end tapered surface of the humeral stem 1 , and the locking of the humeral head 2 and the humeral stem 1 can be achieved by maintaining a certain taper. The upper end of the proximal part of the humerus stem 4 protrudes from a frustum-shaped convex post with a certain taper, which is matched and locked with the inner taper hole on the humeral head 2 . The ball center of the humeral head 2 is not on the axis extension line of the taper hole of the humeral head 2, and has a certain offset distance, so that the humeral head 2 and the humeral stem 1 have various relative positions when the humeral head 2 rotates around the taper hole. The distal part of the humerus stem 3 is matched with the proximal part of the humerus stem 4 through the projection socket, for example, a groove is provided on the distal part of the humerus stem 3 , and a protrusion is provided on the proximal part of the humerus stem 4 . Preferably, for a firm fit, a "soil"-shaped or "I"-shaped protrusion can be provided on the proximal humeral stem part 4, and a groove of a corresponding shape can be provided on the distal humeral stem part 3. The set screw 5 passes through the distal part of the humerus stem 3 and abuts against the proximal part of the humerus stem 4, and tightening can lock the distal part of the humerus stem 3 and the proximal part of the humerus stem 4 to prevent the two from sliding relative to each other. The upper surface and the lower spherical surface of the proximal humeral stem part 4 are designed to have a certain angle, corresponding to the sagittal plane and the coronal plane. The proximal part 4 of the humerus stem and the distal part 3 of the humerus stem of various specifications can be combined, so that the combined shoulder joint prosthesis can have various neck-shaft angles or retroversion angles and offset distances.

Preferably, the processing method of the combined shoulder joint prosthesis of the present invention may be precision casting, welding, mechanical cutting, electrical discharge machining and the like.

Preferably, the combined shoulder joint prosthesis of the present invention is made of medical metals, including but not limited to titanium and titanium alloys, cobalt alloys, stainless steel, tantalum metals, and magnesium alloys. Such metal materials are listed in ISO- The 583 series of international standards have provisions, and its biocompatibility has been confirmed by many years of practice in orthopedic implant applications at home and abroad.

From the above description, it can be seen that the present invention achieves the following technical effects:

1. In the combined shoulder joint prosthesis of the present invention, the inner conical surface of the humeral head and the upper conical surface of the humeral stem cooperate to realize the locking of the humeral head and the humeral stem. Offset, so that the humeral head and humeral stem have various relative positions when the humeral head rotates.

2. The humerus stem is composed of the distal part of the humerus stem and the proximal part of the humerus stem connected through a slot. The proximal end of the humerus stem and the distal end of the humerus stem of different specifications can be combined with each other, and there are many kinds of combined shoulder joint prosthesis. Neck Shaft Angle, Caster Angle, and Offset.

The invention provides a variety of adjustable positions and specifications, improves the matching degree between the shoulder joint prosthesis and the patient's physiological part, and is beneficial to the postoperative rehabilitation of the patient.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (7)

1. A combined shoulder prosthesis, characterized in that it comprises: The humerus stem (1) comprises a humerus stem distal part (3) and a humerus stem proximal part (4), and the humerus stem distal part (3) is detachably connected to the humerus stem proximal part (4) ; The humeral head (2) is connected with the proximal part (4) of the humerus handle; The distal part of the humerus stem (3) is connected with the proximal part of the humerus stem (4) through a socket; A slot is set on the distal part of the humerus stem (3), and a bump is set on the proximal part of the humerus stem (4), the bump is in the shape of "earth" or "I", and the slot It is in the corresponding "earth" or "work" shape. 2. The combined shoulder joint prosthesis according to claim 1, further comprising a set screw (5), which passes through the distal end piece (3) of the humerus stem and abuts against the proximal end of the humerus stem pieces (4). 3. The combined shoulder joint prosthesis according to claim 1, characterized in that, the humeral head (2) is connected to the proximal humeral stem (4) through a tapered hole. 4. The combined shoulder joint prosthesis according to claim 3, characterized in that, a truncated cone-shaped boss is set on the proximal end piece of the humerus handle (4), and the humeral head (2) is set with the Tapered hole for boss fit. 5. The combined shoulder joint prosthesis according to claim 4, characterized in that there is an offset between the spherical center of the humeral head (2) and the axis extension line of the taper hole. 6. The combined shoulder joint prosthesis according to claim 1, characterized in that there is an offset between the center of the humeral head (2) and the axis extension of the proximal humerus stem (4) . 7. The combined shoulder joint prosthesis according to claim 1, wherein the combined shoulder joint prosthesis is made of medical metal.