Internal pelvic fixator

Patent metadata

Field	Value
Publication number	US-2018177531-A1
Application number	US-201615736102-A
Country	US
Kind code	A1
Filing date	Jun 22, 2016
Priority date	Jun 22, 2015
Publication date	Jun 28, 2018
Grant date	—

Abstract

A system and method for internal pelvic fixation. Guide wires can be inserted through guides and opposing sides of a pelvic bone, and can indicate a depth for driving bone screws into the pelvic bone. Offset rod tools positioned about each guide can assist in determining an offset distance between an implant rod and the pelvic bone. A template rod may be coupled to the offset rod tools and used to select a length for the implant rod. Clamps can be coupled to the bone screws, the clamps having multiple axes of rotation, the angular positions of the clamps being secured by the tightening of a single nut of each clamp. Joysticks used to tighten the nuts can be coupled to a reduction holder mechanism that can decrease at least an axial distance between the clamps, and thus pelvic bones, before locking of the clamps via tightening of the nuts.

First claim

1 . An internal pelvic fixation apparatus for maintaining a reduction of bone structures of a pelvic bone, the apparatus comprising:
a first clamp structured to be selectively adjustably rotatable about a first axis, at least a portion of the first clamp also being selectively adjustable about a second axis, the first axis being non-parallel to the second axis, the first clamp having a first clamp bore having a first uncompressed size when the first clamp is in an unlocked state and a first compressed size when the first clamp is in a locked state; a second clamp structured to be selectively adjustably rotatable about a third axis, at least a portion of the second clamp also being selectively adjustable about a fourth axis, the third axis being non-parallel to the fourth axis, the second clamp having a second clamp bore having a second uncompressed size when the second clamp is in an uncompressed state and a second compressed size when the second clamp is in a locked state; and an implant rod sized to extend to opposing sides of the pelvis bone, the implant rod having a first end and a second end, the first end sized for adjustable insertion through the first clamp bore, the second end sized for adjustable insertion through the second clamp bore, wherein the first compressed size of the first clamp bore and the second compressed size of the second clamp bore are sized to exert a compression force on the implant rod that prevents movement of the implant rod relative to the first and second clamps.

2 . The apparatus of claim 1 , wherein the first axis is a central longitudinal axis of a first bone screw that is structured to be driven into a first side of the pelvis bone and the second axis is a central longitudinal of a second bone screw, the second bone screw structured to be driven into a second side of the pelvis bone, and wherein the implant rod is configured to accommodate bending of the implant rod during an implant procedure to generally match a patient anatomy.

3 . The apparatus of claim 2 , wherein the first clamp includes a first clamping segment and a second clamping segment, the first clamping segment structured to be rotatable about the first axis when the first clamp is in the unlocked state and to be secured at an angular position relative to the first axis when the first clamp is in the locked state, the first clamping segment having a first segment bore that extends along the second axis, at least a portion of the second clamping segment extending into the first segment bore and being rotatable about the second axis, the first clamp bore positioned in a portion of the second clamping segment.

4 . The apparatus of claim 3 , wherein the first axis is arranged substantially perpendicular to the second axis, and further wherein the angular position of the first clamp about the first axis and the second clamping segment about the second axis are both retained by the first clamp being placed in the locked state.

5 . The apparatus of claim 3 , wherein the second clamp includes a third clamping segment and a fourth clamping segment, the third clamping segment structured to be rotatable about the third axis when the second clamp is in the unlocked state and to be secured at an angular position relative to the third axis when the second clamp is in the locked state, the third clamping segment having a third segment bore that extends along the fourth axis, at least a portion of the fourth clamping segment extending into the third segment bore and being rotatable about the fourth axis, the second clamp bore positioned in a portion of the fourth clamping segment.

6 . The apparatus of claim 5 , wherein the third axis is arranged substantially perpendicular to the fourth axis, and further wherein the angular position of the second clamp about the third axis and the fourth clamping segment about the fourth axis are both retained by the second clamp being placed in the locked state.

7 . The apparatus of claim 1 , further comprising at least one joystick, the at least one joystick having a handle, a body portion, and an engagement member, the handle extending through at least a portion of the body portion and coupled to the engagement member, the engagement member being axially displaceable by axial displacement of the handle relative to the body portion, the engagement member further being rotatable by rotation of the handle, the engagement member being configured to be removably coupled to at least one of the first and second clamps in a manner that translates rotational movement of the engagement member to a nut of the first or second clamp.

8 . The apparatus of claim 7 , wherein the at least one joystick further includes an engagement member coupled to the body portion, the engagement member having a cavity positioned between a first end and a second end of the engagement member, at least a portion of the engagement body sized for axial and rotational displacement within the cavity, the second end of the engagement member having a recess sized to engage a bone screw that is coupled to one of the first and second clamps in a manner that prevents rotation of the bone screw as the engagement body is coupled to and rotates the nut of the first or second clamp.

9 . The apparatus of claim 7 , wherein the body portion of the at least one joystick includes a grip section.

10 . The apparatus of claim 7 , further comprising a reduction holder mechanism having a strut mechanism, a first pivotal coupler, and a second pivotal coupler, the first and second pivotal couplers pivotally connected to opposing ends of the strut mechanism, the first and second pivotal couplers each having an opening sized to receive insertion of a portion of the at least one joystick, the strut mechanism structured to adjust an axial distance between at least the first and second pivotal couplers.

11 . The apparatus of claim 10 , wherein the first and second pivotal couplers each include a lock mechanism, the lock mechanism being displaceable between a first position and a second position, the lock mechanism structured to retain the received portion of the at least one joystick when the lock mechanism is in the second position.

12 . The apparatus of claim 10 , wherein the strut mechanism includes a lock device that is adjustable between a locked state and an unlocked state, the lock device structured to prevent adjustment of an axial length of the strut mechanism when the lock device is in the locked state.

13 . An internal pelvic fixation kit, comprising:
at least one template rod sized to extend at least between opposing sides of a pelvis bone of a patient, the at least one template rod being manually bendable during implantation to generally conform to the anatomy of the patient; a first clamp and a second clamp, the first and second clamps structured for selective and lockable rotation about one or more axes, the first and second clamps each having a clamping bore, the clamping bore being selectively adjustable between an uncompressed state and a compressed state; at least one implant rod, the clamping bore of the first and second clamps sized to receive insertion of an end of the at least one template rod and to exert a clamping force on the at least one template rod when the clamping bore is in the compressed state; and at least one guide sized to be positioned adjacent to a portion of the pelvis bone, the at least one guide having indicia indicative of an offset position from placement of at least one of following away from the pelvis bone: a) the first clamp, b) the second clamp, c) the at least one template rod, and d) the at least one implant rod.

14 . The kit of cl

Assignees

• Smith & Nephew Inc

Inventors

• Ritchey Nick
• Ferguson Joe
• Brownhill James

Classifications

• A61B17/6441

  Bilateral fixators, i.e. with both ends of pins or wires clamped · CPC title

• A61B17/66

  {Alignment}, compression or distraction mechanisms · CPC title

• A61B17/8863

  Apparatus for shaping or cutting osteosynthesis equipment by medical personnel · CPC title

• A61B17/6433

  specially adapted for use on body parts other than limbs, e.g. trunk or head · CPC title

• A61B17/8875

  Screwdrivers, spanners or wrenches · CPC title