MXPA00010094A - Bone augmentation device - Google Patents

Abstract

The bone augmentation device is used for attachment of soft tissues to bone by means of sutures. It comprises a curved bone plate (1) with several through holes (2). The bone plate (1) lies in a curved plane (3) having a curvature RPL in the range of 25 to 100 mm. The edges (4) of the plate (1) are rounded with a curvature REP in the range of 0,2 to 0,7 mm and the edges (5) of the through holes (2) are rounded with a curvature REH in the range of 0,2 to 0,8 mm. The device according to the invention prevents the suture from cutting through the bone and prevents gapping between the soft tissue (tendon) and bone which would result in a poor healing. The consequence is that a stable repair will facilitate healing.

Description

A DEVICE FOR THE FIXING OF SOFT TISSUES TO BONES BY MEANS OF SUTURES This invention relates to a device for the attachment of soft tissues to bones according to the exordium of claim 1. Such fixation devices are used for the attachment of soft tissues to bones by means of commonly used sutures. The fixation of soft tissues to bones is a technique frequently required in orthopedic surgical procedures. This technique is used in the repair of soft tissue avulsions of bones, as well as in reconstruction procedures. The fixation devices are used particularly for the fixation to bones of tendons to vul les, joints, ligaments, joint capsules. These devices are indicated for the following fields of application: A) Instability of the shoulder and tearing of the rotator cuff The shoulder is dislocated more frequently than other human joints, causing Limitation of pain movement in athletes and non-athletes of all ages.

B) Inestability of the knee C) Tenodesis and repair of the ligaments of the foot, ankle and wrist. A prior art procedure for the fixation of soft tissues to bones is a classic Bankart procedure that is a widely accepted method for treating anterior or inferior gleno-humeral instability of the shoulder. This procedure uses sutures that are inserted directly through the shoulder. of transoseous tunnels. While surgical exposure involves minimal trauma and incision in the skin and leads to excellent clinical results with reported recurrence rate of only 3.5 to 4.0%, the procedure of re-ligating the ligament or torn tendon can be slow and difficult. Although there are modifications that reduce the operating time for the standard repair of the rotator cuff and the Bankart lesion, these approaches are technically demanding. Another known method for the fixation of soft tissues to bones is the use of clamps surgical, which has however, the tendency to cut through the bone and tendon. The claimed invention has the purpose of solving the previously described problems. The present invention provides a device for the attachment of soft tissues to bones as defined in claim 1. The device according to the invention prevents the suture cut through the bone and that openings are formed between the soft tissue (tendon) and the bone, resulting in a difficult healing. The consequence is that a stable repair will facilitate healing. The device according to the invention consists of a curved plate having a curvature RPL in the range of 25 to 100 mm. For application to the humerus, the RPL curvature should be in the range of 35 to 70 mm, preferably in the range 45 to 55 mm. To prevent damage to the suture at the edges of the plate, the edges on the outer periphery of the plate are rounded with a curvature RP1 in the range of 0.2 to 0.7 mm, and the The edges of the through holes are rounded with a curvature RBs in the range of 0.2 to 0.8 mm. The curvature RBp of the peripheral edge is selected rather in the range of 0.25 to 0.50 mm and preferably in the range of 0.3 to 0.4 mm. The RBA curvature of the edges of the through holes is chosen in the range of 0.30 to 0.50 mm and, more preferably, in the range of 0.35 to 0.45 mm. The maximum thickness of the plate is less than 1 mm and preferably less than 0.75 mm. The maximum area F of the convex surface of the plate, including the area of the through holes, should be in the range of 100 - 250 mm, preferably in the range of 125 - 175 mm2. The device according to the invention needs at least one through hole and preferably at least two through holes. For many applications four to seven through holes are ideal. The through holes should have a diameter in the range of 1.70 to 2.0 mm preferably in the range of 1.80 to 1.90 mm. The minimum distance between two centers of the through holes is in the range of 3.0 to 4.0 mm and preferably in the range of 3.4 to 3.8 mm The device can be made of any recognized implant material, but titanium is preferred because it can withstand higher loads compared to plastic materials. Alternatively, titanium offers the possibility of designing plates with reduced thickness.

The different features and novelty that characterize the invention are pointed out particularly in the appended claims forming part of this disclosure. For a better understanding of the invention, its operational advantages and the specific objectives achieved by its use, reference should be made to the accompanying drawings, examples and descriptive material, in which preferred embodiments of the invention are illustrated and described. In the drawings: Figure 1 is a top plan view of the device according to the invention; Figure 2 is a section along line 11-1 of Figure 1; and Figure 3 is a section along the line III-II of Figure 1. Figures 1 to 3 show a device for 1 fixation of soft tissues to bones by suture means consisting of a curved plate 1 made entirely of titanium with a thickness of 0.7 mm. The plate 1 is provided with seven through holes 2 having a diameter of 1.85 mm whose centers are separated from one another in a regular manner at 3.6 mm. The plate 1 is located in a curved plane 3 having a curvature RBp of 50 mm. The outer edge 4 of the plate is rounded with a curvature RBp of 0.35 mm and the edges 5 of the through holes 2 are also rounded with a curvature RBA of 0.4 mm. The plate 1 has a maximum area F of the convex surface, including the area of the through holes 2, approximately 150 mm. A brief description of the method of operation with the device according to the invention follows. First, the surgeon chooses the tendon fixation site. Using a wick, a depression is selected that will later receive the tendon stump. Holes are formed in the bone. Stitches are formed in the tendon, the ends of the sutures pass through the holes in the bones. The sutures are passed through the appropriate holes of the fixation device. When adjusting the knots the avulsed tendon and the fixation device are pulled on the bone. The resulting repair is very stable. and does not allow any opening between the tendon and the bone. While the foregoing description and drawings represent the preferred embodiments of the invention, it will be obvious to those skilled in the art that various changes and modifications of the invention may be made without departing from the true spirit and scope thereof.

Claims (5)

1. CLAIMS 1. Augmentation device for the bone for the attachment of soft tissues to the bone by means of sutures, comprising a curved bone plate with rounded edges and with at least one through hole, characterized in that A) the bone plate is located in a curved plane having a curvature RP in the range of 25 to 100 mm; B) the rounded edges of the plate have REP curvature in the range of 0.2 to 0.7 mm; C) the edges of the through holes are rounded with a REH curvature in the range of 0.2 to 0.8 mm; D) the bone plate is made of a non-resorbable implant material
2. 2. Device according to the rei indication 1, characterized in that the curvature of RP1 of the plane is in the range of 35 to 70 mm, preferably in the range of 45 to 55 mm.
3. 3. Device according to claim 1 or 2, characterized in that the REP curvature of the edges is in the range of 0.25 to 0.50 mm, preferably in the range of 0.3 to 0.4 mm.
4. 4. Device according to one of claims 1 to 3, characterized in that the curvature of REH of the edges is in the range of 0.30 to 0.50 mm, preferably in the range of 0.35 to 0.45 mm.
5. 5. Device according to one of claims 1 to 4, characterized in that the maximum thickness of the plate is below 1 mm, preferably below 0.75 mm.