Fast adjust external fixation connection rod

• US 9,456,849 B2
• Filed: 07/13/2015
• Issued: 10/04/2016
• Est. Priority Date: 02/12/2008
• Status: Active Grant

• Current Assignee: Texas Scottish Rite Hospital for Children
• Original Assignee: Texas Scottish Rite Hospital for Children
• Inventors: Ross, John David, Samchukov, Mikhail L., Cherkashin, Alexander M., Birch, John G.
• Primary Examiner(s): PLIONIS, NICHOLAS J
• Application Number:
  US14/798,334
• Publication Number:
  US 20150313641A1
• Time in Patent Office: 449 Days
• Field of Search: 606/56
• US Class Current: 1/1
• CPC Class Codes: A61B 17/62 Ring frames, i.e. devices extending around the bones to be positioned A61B17/6433 , A61B17/66 take precedence
• CPC Class Codes: A61B 17/6475 the connecting rod being threaded
• CPC Class Codes: A61B 2017/00991 Telescopic means
• CPC Class Codes: A61B 2017/564 Methods for bone or joint treatment

Abstract

The present disclosure provides various embodiments of an external fixation connection rod having articulatable joints that can be attached to external supports, such as rings. In some embodiments, the fixation connection rod includes a telescopic rod and connecting mechanisms for coupling the joints of the connection rod to the external supports. and the connecting mechanisms are operable to substantially lock the orientation of the joints. In some other embodiments, the connection rod includes a housing having parallel axial bores defined therethrough and sleeves slidably disposed in the axial bores. Also included in the present disclosure are methods of maintaining the orientation of first and second fixator rings for immobilizing bone segments.

Claims

1. A method of maintaining the orientation of first and second rings for immobilizing bone segments, comprising:

providing a connecting rod having a longitudinal axis and comprising;

a telescopic housing comprising an axial bore defined therethrough;

an adjustment sleeve slidably disposed within the axial bore, the adjustment sleeve and the telescopic housing being releasably coupled by a fastener; and

an elongated member coupled to the adjustment sleeve;

wherein a first joint is coupled to an end portion of the housing, and a first rotating member is received in the first joint, and further wherein the first rotating member comprises a first connection mechanism operable to releasably couple the first rotating member to the first ring and limit the rotational movement of the first rotating member; and

wherein a second joint is coupled to an end portion of the elongated member, and a second rotating member is received in the second joint, and further wherein the second rotating member comprises a second connection mechanism operable to releasably couple the second rotating member to the second ring and limit the rotational movement of the second rotating member;

adjusting the longitudinal position of the adjustment sleeve relative to the telescopic housing;

releasably coupling the adjustment sleeve to the telescopic housing using a sleeve fastener;

using the first connection mechanism to releasably couple the first rotating member to the first ring and limit the rotational movement of the first rotating member; and

using the second connection mechanism to releasably couple the second rotating member to the second ring and limit the rotational movement of the second rotating member;

wherein the first and second connection mechanisms are operable to releasably couple the respective rotating member to the respective fixator ring using a fastener, the fastener being disposed at least partially in the respective rotating member; and

wherein at least one of the first and second joints includes a channel defined in a wall of the joint, and the respective fastener includes a threaded end disposed through the channel thereby limiting the rotation of the respective rotating member in a first direction about the joint while allowing a greater range of motion in a second direction about the joint.

2. The method of claim 1, wherein the first and second connection mechanisms each comprise a fastener aperture defined in the first and second rotating members, respectively, and wherein the method further comprises:

disposing ring fasteners through bores defined in the first and second ring and into the fastener apertures of the first and second rotating members, whereby the rotational movements of the first and second rotating members are limited.

3. The method of claim 2, wherein the first joint comprises a textured surface operable to provide frictional contact with a surface of the first ring.

4. The method of claim 3, wherein the textured surface of the first joint comprises parallel grooves defined therein.

5. The method of claim 2, wherein the second joint comprises a textured surface operable to provide frictional contact with a surface of the second ring.

6. The method of claim 5, wherein the textured surface of the second joint comprises parallel grooves defined therein.

7. The method of claim 1, wherein the telescopic housing comprises an aperture defined in a wall of the housing, the aperture extending longitudinally along the housing, and wherein the method further comprises monitoring acute translation of the adjustment sleeve relative to the telescopic housing.

8. The method of claim 1, wherein the adjustment sleeve comprises an aperture defined in a wall of the adjustment sleeve, the aperture extending longitudinally along the adjustment sleeve, and wherein the method further comprises monitoring gradual translation of the elongated member relative to the adjustment sleeve.

9. The method of claim 1, wherein the channel includes a slot, and the threaded end of the fastener is disposed through the slot.

10. The method of claim 1, wherein

at least one of the first and second joints comprise a socket,

the socket comprises a plurality of recessed portions defined in the wall of the socket,

the channel is provided by at least one of the recessed portions,

the recessed portions respectively comprise an opening toward an end portion of the connecting rod and away from a central portion of the connecting rod,

the respective rotating member comprises a ball member, and

the ball member is disposed in the socket.

11. The method of claim 1, wherein the elongated member is an externally threaded elongated member threadably coupled to the adjustment sleeve.

12. The method of claim 1, wherein

the elongated member is an externally threaded elongated member,

the adjustment sleeve comprises an adjustment mechanism having a rotation element,

the rotation element has an internally threaded bore defined therethrough,

the threaded elongated member is disposed through the threaded bore of the rotation element of the adjustment mechanism, and

the external thread of the elongated member and the internal thread of the threaded bore mate with each other such that rotating the rotation element causes the threaded elongated member to translate along the longitudinal axis of the connecting rod.

13. The method of claim 12, wherein the adjustment mechanism is rotatably coupled to an end portion of the adjustment sleeve, the adjustment mechanism being operable to rotate but not translate relative to the end portion of the adjustment sleeve.

14. The method of claim 1, wherein

the telescopic housing comprises an aperture defined in a wall of the housing, the aperture extending longitudinally along the housing,

the adjustment sleeve comprises a threaded radial bore, and

the fastener comprises a screw inserted through the aperture of the telescopic housing and received in the threaded radial bore.

15. The method of claim 14, wherein

the connecting rod further comprises a washer having a central opening defined therein, the washer being disposed on an outer surface of the telescopic housing, and

the screw is inserted through the central opening of the washer, through the aperture of the telescopic housing, and received in the threaded radial bore.

16. The method of claim 1, wherein the adjustment sleeve comprises an aperture defined in a wall of the adjustment sleeve, the aperture extending longitudinally along the adjustment sleeve.

17. The method of claim 1, wherein the channel is provided such that a center axis of the fastener is capable of aligning with a center axis of the elongated member.