# US 5,944,757 A · Total trochitero-acromial shoulder prosthesis

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 5,944,757 A
- Document ID: US5944757A
- Status: Granted
- Kind: A
- Application number: 08/836,629
- Filed: 1997-05-01
- Granted: 1999-08-31
- Earliest claimed: 1995-09-22
- Assignees: Medinov-Amp
- Inventors: Paul Marie Grammont
- Web page: https://patentgrep.com/patent/US5944757A

## CPC

- A61F 2/40: for shoulders
- A61F 2/30767: {Special external or bone-contacting surface, e.g. coating for improving bone ingrowth}
- A61F 2/4003: {Replacing only the epiphyseal or metaphyseal parts of the humerus, i.e. endoprosthesis not comprising an entire humeral shaft (replacing only the epiphyseal or metaphyseal parts of the femur A61F2/3601)}
- A61F 2002/30154: {square}
- A61F 2002/30224: {cylindrical}
- A61F 2002/30616: {Sets comprising a plurality of prosthetic parts of different sizes or orientations}
- A61F 2002/3082: {Grooves}
- A61F 2002/30822: {Circumferential grooves}
- A61F 2002/30841: {Sharp anchoring protrusions for impaction into the bone, e.g. sharp pins, spikes}
- A61F 2002/30878: {with non-sharp protrusions, for instance contacting the bone for anchoring, e.g. keels, pegs, pins, posts, shanks, stems, struts}
- A61F 2002/4018: {Heads or epiphyseal parts of humerus}
- A61F 2002/4088: {Acromial components}
- A61F 2002/4631: {the prosthesis being specially adapted for being cemented}
- A61F 2230/0021: square
- A61F 2230/0069: cylindrical
- A61F 2310/00017: Iron- or Fe-based alloys, e.g. stainless steel
- A61F 2310/00604: Coating made of aluminium oxide or hydroxides
- A61F 2310/00622: Coating made of chromium oxide or hydroxides
- A61F 2310/00796: Coating or prosthesis-covering structure made of a phosphorus-containing compound, e.g. hydroxy(l)apatite
- A61F: FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS (dental prosthetics A61C)

## Abstract

Total trochitero-acromial shoulder prosthesis comprising two elements, namely, a trochiterian element (13), having the shape of a convex spherical sector, and equipped with means for fastening to the site of the trochiter, and an acromial element (12) having a bearing surface for the trochiterian element (13) and equipped with means for fastening to the lower face of the acromion, in such a way as to cover the afore-mentioned trochiterian element, and whose dimensions are such that the acromional element remains free to move, without overshooting the clavicle, as one with the acromion, once the latter has been sectioned at the level of the pillar of the scapular spine and a method of using the same.

## Claims

### Claim 1

Method for implanting a total trochitero-acromial shoulder prosthesis comprising a trochiterian element having the shape of a convex spherical sector and equipped with means for fastening to the site of the trochiter, and an acromial element (12) having a bearing surface for the trochiterian element (13) and equipped with means for fastening to the lower face of the acromion, the acromial element being configured to cover the trochiterian element and being dimensioned to remain free to move, without overshooting the clavicle, as one with the acromion, the latter having been sectioned at the level of the pillar of the scapular spine, the method comprising implanting the trochiterian element, sectioning the acromion at the level of the pillar of the scapular spine, and fastening the acromial prosthesis element under the acromion, such that the prosthesis remains free in relation to the scapular spine so as to act as a patelliform articulation.

### Claim 2 (depends on 1)

The method of claim 1 wherein the acromial prosthesis element (12) does not overshoot the lower face of the part of the acromion which has been released from the scapular spine by sectioning at the level of the pillar.

### Claim 3 (depends on 1)

Method according to claim 1, wherein the tension of the muscles of the rotator cuff of the shoulder is controlled by acting on the thickness of the acromial element.

### Claim 4

Total trochitero-acromial shoulder prosthesis comprising: a trochiterian element (13) having the shape of a convex spherical sector and equipped with means for fastening to the site of the trochiter, and an acromial element (12) having a bearing surface for the trochiterian element (13) and equipped with means for fastening to the lower face of the acromion, the acromial element being configured to cover the trochiterian element and being dimensioned to remain free to move, without overshooting the clavicle, as one with the acromion, the latter having been sectioned at the level of the pillar of the scapular spine.

### Claim 5 (depends on 4)

Prosthesis according to claim 4, wherein the said bearing surface is concave.

### Claim 6 (depends on 4)

Prosthesis according to claim 4, wherein the said bearing surface has a radius substantially equal to that of the sector of the trochiterian element.

### Claim 7 (depends on 4)

Prosthesis according to claim 4, wherein the acromial element (12) dimensioned to cover the whole of the lower face of the released part of the acromion.

### Claim 8 (depends on 4)

Prosthesis according to claim 4, wherein an upper face (12b) of the acromial element (12) is designed to match the lower face of the acromion and the fastening means (12c) is adapted to be fastened in holes formed in the lower face of the acromion.

### Claim 9 (depends on 4)

Prosthesis according to claim 4, wherein the thickness of the acromial element is of the order of 8 to 10 mm.

### Claim 10 (depends on 4)

Prosthesis according to claim 4, wherein the fastening means of the trochiterian element (13) comprises one or more anchoring pins.

### Claim 11 (depends on 4)

Prosthesis according to claim 4, wherein the trochiterian element is made in the form of a spherical cap.

### Claim 12 (depends on 4)

Prosthesis according to claim 4, wherein the trochiterian element and/or the acromial element is made of metal, or of high-density polyethylene.

### Claim 13 (depends on 12)

Prosthesis according to claim 12, wherein a bonding face of the trochiterian element (13) and/or of the acromial element (12) is treated or covered with a material facilitating bonding to a sealing cement and osseous integration.

### Claim 14 (depends on 4)

Prosthesis according to claim 4, wherein a bonding face of the trochiterian element (13) and/or of the acromial element (12) is covered with hydroxyapatite.