FAST ADJUST EXTERNAL FIXATION CONNECTION ROD

• US 20130123784A1
• Filed: 01/02/2013
• Published: 05/16/2013
• 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: Birch, John G., Ross, John David, Samchukov, Mikhail L., Cherkashin, Alexander M.
• Granted Patent: US 9,078,700 B2
• Time in Patent Office: Days
• US Class Current: 606/56
• 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 connecting rod for an external fixation device, the connecting rod defining a longitudinal axis and comprising:

a telescopic housing comprising;

a housing body having an axial bore defined therethrough;

a first joint coupled to an end portion of the housing body; and

a first rotating member received in the first joint, wherein the first rotating member is operable to rotate relative to the first joint about a first axis orthogonal to the longitudinal axis of the connecting rod, and the first rotating member comprises a first connection mechanism operable to releasably couple the first rotating member to a first ring;

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, the elongated member comprising;

a rod;

a second joint coupled to an end portion of the rod;

a second rotating member received in the second joint, wherein the second rotating member is operable to rotate relative to the second joint about a second axis orthogonal to the longitudinal axis of the connecting rod, and the second rotating member comprises a second connection mechanism operable to releasably couple the second rotating member to a second ring;

wherein, the first and second connection mechanisms are operable to substantially limit the rotational movement of the first and second rotating members, respectively; and

wherein at least one of the first and second rotating members comprises a slot, the respective connection mechanism is operable to releasably couple the respective rotating member to the respective fixator ring using a fastener passing through the slot and coupled to the respective rotating member, and the cooperation of the slot and the fastener limit the rotation of the respective rotating member.

2. The connecting rod of claim 1, wherein the first and second connection mechanisms each comprise a fastener aperture defined in the first and second rotating member, respectively, and further wherein each fastener aperture is operable to receive a ring fastener disposed through a bore defined in the first or second ring.

3. The connecting rod 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 connecting rod of claim 3, wherein the textured surface comprises parallel grooves defined therein.

5. The connecting rod 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 connecting rod of claim 5, wherein the textured surface comprises parallel grooves defined therein.

7. The connecting rod 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 the adjustment sleeve comprises a threaded radial bore, and further wherein the fastener comprises a screw inserted through the aperture of the telescopic housing and received in the threaded radial bore.

8. The connecting rod of claim 7, further comprising a washer having a central opening defined therein, the washer being disposed on an outer surface of the telescopic housing, and further wherein 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.

9. The connecting rod 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.

10. The connecting rod 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 having an internally threaded bore defined therethrough, wherein the threaded elongated member is disposed through the threaded bore of the rotation element of the adjustment mechanism, the external thread of the elongated member and the internal thread of the threaded bore mating with each other such that rotating the rotation element causes the threaded elongated member to translate along the longitudinal axis of the connecting rod.

11. The connecting rod of claim 10, 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.

12. 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 substantially 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 substantially limit the rotational movement of the second rotating member;

adjusting the longitudinal position of the adjustment sleeve relative to the telescopic housing, thereby rotating the first and second rotating members about first and second axes, respectively, wherein the first and second axes are both orthogonal to the longitudinal axis of the connecting rod;

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 substantially 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 substantially limit the rotational movement of the second rotating member;

wherein at least one of the first and second rotating members comprises a slot, the respective connection mechanism is operable to releasably couple the respective rotating member to the respective fixator ring using a fastener passing through the slot and coupled to the respective rotating member, and the cooperation of the slot and the fastener limit the rotation of the respective rotating member.

13. The method of claim 12, wherein the first and second connection mechanisms each comprise a fastener aperture defined in the first and second rotating member, 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 substantially limited.

14. The method of claim 12, 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.

15. The method of claim 12, 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.

16. A connecting rod for an external fixation device comprising:

a telescopic housing having a housing body, wherein a first portion of the housing body comprises a first axial bore defined therethrough, and a second portion of the housing body comprises a second axial bore defined therethrough, the first and second axial bores having first and second longitudinal axes, respectively, and further wherein the first and second longitudinal axes are parallel and coplanar;

first and second sleeves slidably disposed within the first and second axial bores, respectively, the first sleeve having an adjustment mechanism rotatably disposed on an end portion of the first sleeve; and

an elongated member coupled to the adjustment mechanism;

wherein the housing body comprises first and second apertures defined in walls of the first and second portions of the housing body, respectively, the first and second apertures being aligned along the first and second axes, respectively;

wherein a first fastener is disposed through the first aperture of the housing body and received in a fastener aperture defined in the first sleeve, and a second fastener is disposed through the second aperture of the housing body and received in a fastener aperture defined in the second sleeve, the first and second fasteners being operable to releasably couple the first and second sleeves to the housing body, respectively; and

wherein a joint coupled either to an end portion of the elongated member or an end portion of the second sleeve comprises a slot, a connection mechanism and a rotating member, the connection mechanism is operable to releasably couple the rotating member to a fixator ring using a fastener passing through the slot and coupled to the rotating member, and the cooperation of the slot and the fastener limit the rotation of the rotating member.

17. The connecting rod of claim 16, wherein the joint is coupled to an end portion of the elongated member.

18. The connecting rod of claim 16, wherein the joint is coupled to an end portion of the second sleeve.

19. The connecting rod of claim 16, wherein the second sleeve has a second adjustment mechanism rotatably disposed on an end portion of the second sleeve, the second adjustment mechanism being coupled to a second elongated member.

20. The connecting rod of claim 19, further comprising a second joint coupled to an end portion of the second elongated member.