Threaded Joint for Supporting and Stabilizing a Rear Fracture of the Pelvic Ring or for Stabilizing and Stiffening the Sacroiliac Joint

Abstract

Threaded joints for supporting and stabilizing a rear fracture of the pelvic ring or for stabilizing and stiffening the sacroiliac joint, either with a threaded bar in connection with threaded nuts or a screw in connection with the sacrum. The threaded joints are characterized by secure support and stabilization of a rear fracture of the pelvic ring or by secure stabilization and stiffening of the sacroiliac joint. The threaded joint as an implant is either a threaded bar in connection with threaded nuts for supporting the rear fracture of the pelvic ring or a screw in connection with the sacrum. There is a washer located between the ilium and the threaded nut or the screw head, the side of the washer that faces the ilium being mutually oblique in at least two planes and the oblique surfaces being arranged at an angle to each another.

Claims

1. Threaded joint for supporting and stabilising a posterior pelvic ring fracture, or for stabilising and stiffening the sacroiliac joint, either using a threaded rod (1) in conjunction with threaded nuts, or a screw (11) in conjunction with the sacrum, characterised in that a washer (2) is located between the ilium and the threaded nut or the screw head, in that the face (3) of the washer (2) that faces the ilium is mutually inclined in at least two planes, the inclines being arranged at an angle to one another, and in that the washer (2) has an opening (4) for the passage of a region of the threaded rod (1) or of the screw (11), the opening (4) being widened in the direction of the ilium.

2. Threaded joint according to claim 1, characterised in that the faces (3) and the openings (4) of the washer (2) that face the ilium mirror one another for placement on the left ilium and on the right ilium.

3. Threaded joint according to claim 1, characterised in that the incline is a straight line or an arch in cross section.

4. Threaded joint according to claim 1, characterised in that the inner wall of the opening (4) is a cone.

5. Threaded joint according to claim 1, characterised in that the face (3) of the washer (2) that faces the ilium has at least one elongate recess for supporting the attachment of the washer (2) to the periosteum.

6. Threaded joint according to claim 1, characterised in that the screw (11) has a conical screw head (12).

7. Threaded joint according to claim 6, characterised in that the screw (11) has the conical screw head (12), a cylindrical shank (13) and a thread (14).

8. Threaded joint according to claim 6, characterised in that the screw (11) has a continuous channel (15) having at least one outlet opening (16) in the region of the thread (14).

9. Threaded joint according to claim 1, characterised in that the face (5) of the washer (2) that faces away from the ilium has at least two of the holes (7) which are used for positioning on the ilium in order to releasably engage projections (9) of a positioning sleeve (8).

10. Threaded joint according to claim 9, characterised in that the projections (9) are axial extensions of the positioning sleeve (8).

11. Threaded joint according to claim 1, characterised in that the inclines of the washer (2) are adapted to the ilium in the region of the ala ossis ilii.

12. Threaded joint according to claim 1, characterised in that the washer (2) and an alignment arm (10) of the positioning sleeve (8) which is connected to the washer (2) are arranged such that the alignment arm (10) points towards the ventral edge of the joint socket of the hip joint.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In the drawings:

[0031] FIG. 1 shows a threaded joint for supporting a posterior pelvic ring fracture,

[0032] FIG. 2 shows a side view of the pelvis with a washer on the ilium,

[0033] FIG. 3 shows a washer of a threaded joint for supporting a posterior pelvic ring fracture or for stabilising the sacroiliac joint,

[0034] FIG. 4 shows a plan view of a washer,

[0035] FIG. 5 shows washers of a threaded joint for supporting a posterior pelvic ring fracture,

[0036] FIG. 6 shows a sectional view of a washer having two holes which are used for positioning on the hip bone in order to releasably engage projections of a positioning sleeve

[0037] FIG. 7 shows a washer having a positioning sleeve,

[0038] FIG. 8 shows a screw for stabilising the sacral fracture and/or stiffening the sacroiliac joint, and

[0039] FIG. 9 shows a sectional view of a screw for stabilising the sacral fracture and/or stiffening the sacroiliac joint.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0040] A threaded joint for supporting a posterior pelvic ring fracture substantially consists of a threaded rod 1 in conjunction with threaded nuts and anatomically shaped washers 2.

[0041] FIG. 1 schematically shows a threaded joint for supporting a posterior pelvic ring fracture.

[0042] The washers 2 are located between the ilium of the pelvis and the known threaded nuts. The threaded nuts are not shown in FIG. 1.

[0043] FIG. 2 schematically shows a side view of the pelvis having a washer 2 on the ilium.

[0044] One washer 2 rests on the ilium in each case.

[0045] FIG. 3 schematically shows a washer 2 of a threaded joint for supporting a posterior pelvic ring fracture or for stabilising the sacroiliac joint.

[0046] The face 3 of the washer 2 that faces the ilium is mutually inclined in at least two planes, the inclines being arranged at an angle to one another. The incline is a straight line and/or an arch in cross section. The washer 2 also has an opening 4 for the passage of a region of the threaded rod 1 or of a screw 11. The opening 4 is widened in the direction of the ilium, and in particular is conical. The face 5 of the washer 2 that is opposite the ilium, and the threaded rod 1 which passes through the opening 4 form a right angle or an approximate right angle.

[0047] FIG. 4 schematically shows a plan view of a washer 2.

[0048] The face 3 of the washer 2 that faces the ilium has two elongate recesses for supporting the attachment of the washer 2 to the periosteum. The recesses are grooves 6, it being possible for one groove 6a to have a V-shape in cross section, and the other groove 6b to have an L-shape in cross section.

[0049] FIG. 5 schematically shows washers 2 of a threaded joint for supporting a posterior pelvic ring fracture.

[0050] The faces 3 and openings 4 of the washers 2 that face the ilium mirror one another for placement on the left ilium and on the right ilium. For this purpose said washers can be marked with an R for right and an L for left.

[0051] FIG. 6 schematically shows a sectional view of a washer 2 having two of the holes 7 which are used for positioning on the ilium in order to releasably engage projections of a positioning sleeve.

[0052] The face 5 of the washer 2 that faces away from the hip bone has at least two of the holes 7 which are used for positioning on the hip bone in order to releasably engage projections 9 of a positioning sleeve 8.

[0053] FIG. 7 schematically shows a washer 2 having the positioning sleeve 8.

[0054] The projections 9 are axial extensions of the positioning sleeve 8. The inclines of the washer 2 are adapted to the ilium in the region of the ala ossis ilii. The washer 2 and an alignment arm 10 of the positioning sleeve 8 connected to the washer 2 are arranged such that the alignment arm 10 points towards the ventral edge of the joint socket of the hip joint.

[0055] In one embodiment, a threaded joint for stabilising the sacroiliac joint can consist of a washer 2 and a screw 11 in conjunction with the sacrum.

[0056] For this purpose, the opening 4 of the washer 2 is used for the passage of the screw 11.

[0057] FIG. 8 schematically shows a screw 11 for stabilising the sacral fracture and/or stiffening the sacroiliac joint.

[0058] The screw 11 has a conical screw head 12, which allows the alignment and placement of the screw 11 through the opening 4 in the washer 2 into the sacrum, in the case of normal anatomy and in the case of dysmorphism of the sacrum. Furthermore, the screw 11 has a cylindrical shank 13 and a thread 14.

[0059] FIG. 9 schematically shows a sectional view of a screw 11 for stabilising the sacral fracture and/or stiffening the sacroiliac joint.

[0060] The screw 11 has a continuous channel 15 having at least one outlet opening 16 in the region of the thread 14.