DEVICE FOR PLACING A RECEIVING PART ONTO A HEAD OF A BONE ANCHORING ELEMENT

• US 20150257798A1
• Filed: 03/11/2015
• Published: 09/17/2015
• Est. Priority Date: 03/14/2014
• Status: Active Grant

• Current Assignee: Biedermann Technologies GmbH & Co. KG
• Original Assignee: Biedermann Technologies GmbH & Co. KG
• Inventors: Biedermann, Lutz, Matthis, Wilfried, Dandanopoulos, Dimosthenis, Biedermann, Timo
• Granted Patent: US 10,258,390 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: A61B 17/7076 for driving, positioning or assembling spinal clamps or bone anchors specially adapted for spinal fixation
• CPC Class Codes: A61B 17/7082 for driving, i.e. rotating, screws or screw parts specially adapted for spinal fixation, e.g. for driving polyaxial or tulip-headed screws driving other bone screws A61B17/8875

Abstract

A device for placing a receiving part of a bone anchoring device onto a head of a bone anchoring element, comprising: a holding device, a collet having a longitudinal axis and being held by the holding device, wherein the collet includes a distal end portion configured to be flexibly expanded and/or compressed in a radial direction perpendicular to the longitudinal axis, wherein an engagement feature is provided at an outer contour of the distal end portion of the collet configured to engage a portion of an inner wall formed in a rod receiving channel or a bore of a receiving part.

Claims

1. A device for placing a receiving part of a bone anchoring device onto a head of a bone anchoring element, comprising:

a holding device,

a collet having a longitudinal axis and being held by the holding device, wherein the collet includes a distal end portion configured to be flexibly expanded and/or compressed in a radial direction perpendicular to the longitudinal axis,

wherein an engagement feature is provided at an outer contour of the distal end portion of the collet configured to engage a portion of an inner wall formed in a rod receiving channel or a bore of a receiving part.

2. The device of claim 1, further comprising

a plunger configured to selectively lock and release the distal end portion of the collet at the receiving part, when the engagement feature engages the portion of the inner wall formed in the receiving part.

3. The device of claim 2, wherein

the collet is configured to be movable with respect to the plunger in a direction along its longitudinal axis between at least

a first lock position, in which the distal end portion of the collet is prevented by a portion of the plunger from being compressed, and

a second release position in which the distal end portion may be resiliently compressed.

4. The device of claim 2, wherein the plunger is fixedly coupled to the holding device.

5. The device of claim 2, wherein

the collet is movably held by the holding device and has a tubular shape;

and

the plunger has a rod-shape and at least partially extends through the collet.

6. The device of claim 5, wherein

the plunger is coupled to the holding device via a fixation device extending though an oblong aperture formed in the tubular-shaped collet.

7. The device of claim 2, further comprising:

a resilient member, which is coupled between the holding device and a proximal end portion provided at the collet so as to urge the collet into a proximal direction in order to establish the first lock position.

8. The device of claim 7, wherein

the plunger has a tip portion, which is configured, in the first lock position, to enter the distal end portion of the collet such as to prevent compression thereof.

9. The device of claim 8, wherein

the tip portion of the plunger further comprises a tapered or conical portion configured to further expand the distal end portion of the collet in addition to preventing compression.

10. The device of claim 7, further comprising

an operation portion, which is removably connected, fixed to, or integrally formed with the proximal portion provided at the collet configured to allow an operator to move the collet with respect to the holding device and plunger against an urging force of the resilient member to establish the second release position.

11. The device of claim 7, wherein

the receiving part of the bone anchoring device further includes the bore extending from a first end to a second end of the receiving part, the rod receiving channel extending from the first end, and a seat providing an accommodation space for a head of the bone anchoring element is formed at the second end, wherein an inner cap is movably disposed within the accommodation space, which inner cap includes a flexible head receiving portion configured to resiliently clamp the head, and

the resilient member is configured to be tensioned by a force in order to achieve a state, when the plunger releases the distal end portion, which force is less than a clamping force exerted by the flexible head receiving portion of the inner cap.

12. The device of claim 1, wherein

the distal end portion of the collet includes two or more flexible tongues, which are configured to be flexibly expanded and/or compressed in a radial direction perpendicular to the longitudinal axis.

13. The device of claim 1, wherein

the engagement feature is a protrusion or latching recess, which is configured to latch into a corresponding latching recess or protrusion, respectively, provided at the inner wall of the receiving part.

14. The device of claim 13, wherein two or more of the engagement features are provided.

15. A receiving part for connecting a bone anchoring element having a head and a shank to a spinal rod, comprising:

a bore extending from a first end to a second end of the receiving part and comprising an inner wall,

a rod receiving channel extending from the first end and comprising an inner wall,

an opening of the bore provided at the second end and being configured to allow introducing the head into the bore, and

a seat formed adjacent the opening and providing an accommodation space for the head of the bone anchoring element,

wherein the inner wall of the rod receiving channel or the inner wall of the bore comprises an engagement feature configured to engage a corresponding engagement feature of a device for placing a receiving part onto a head of a bone anchoring element.

16. The receiving part of claim 15, further comprising

an inner cap comprising a flexible head receiving portion configured to resiliently clamp the head, the inner cap being movably disposed within the accommodation space.