Rod reduction device
First Claim
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1. An orthopedic rod reduction device comprising:
- an actuator having a drive surface;
a rod engagement element for engaging a rod and moving the rod upon movement of the actuator, anda spring positioned between the drive surface of the actuator and the rod engagement element.
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Abstract
An orthopedic bone rod reduction device and method is disclosed. The device includes an actuator having a drive surface and a bone rod engagement element for engaging with a bone rod. The assembly further includes a spring positioned between the drive surface of the actuator and the rod engagement element. The rod reduction assembly controls movement of a bone rod relative to a bone anchor positioned in a bone.
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Citations
38 Claims
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1. An orthopedic rod reduction device comprising:
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an actuator having a drive surface; a rod engagement element for engaging a rod and moving the rod upon movement of the actuator, and a spring positioned between the drive surface of the actuator and the rod engagement element. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. An orthopedic bone rod reduction assembly comprising:
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a support comprising a proximal head having a threaded passage therethrough and a bone anchor engaging portion extending from the proximal head; an actuator comprising a drive head and an elongate drive shaft extending therefrom; a bone rod engagement element for engaging with and moving the bone rod, the bone rod engagement element comprising a base member and a spring engagement element, a spring extending from a first end which engages the drive head to a second end which engages the spring engagement element of the rod engagement element, wherein the spring is moveable from a natural state to a compressed state by rotation of the drive head relative to the support; wherein the spring is moved to its compressed state by a pre-determined number of rotations of the drive head after which, further rotation of the drive head causes a linear movement of the bone rod engagement element.
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20. An orthopedic rod reduction device comprising:
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an actuator having a first drive head and a second drive head, a drive shaft extending between said first and second drive heads; a rod engagement element for engaging a rod and moving the rod upon movement of the actuator, and a spring positioned between the second drive head of the actuator and the rod engagement element. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32)
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33. An orthopedic bone rod reduction assembly comprising:
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a support comprising a proximal head having a threaded passage therethrough and a bone anchor engaging portion extending from the proximal head; an actuator comprising a first drive head, a second drive head and an elongate drive shaft extending therebetween; a bone rod engagement element for engaging with and moving the bone rod, the bone rod engagement element comprising a base member and a spring engagement element, a spring extending from a first end which engages the second drive head to a second end which engages the spring engagement element of the rod engagement element, wherein the spring is moveable from a natural state to a compressed state by rotation of the first drive head relative to the support; wherein the spring is moved to its compressed state by a pre-determined number of rotations of the first drive head after which, further rotation of the first drive head causes a linear movement of the bone rod engagement element.
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34. A method of supporting the spinal column of a patient including:
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providing a plurality of rod reduction devices, wherein each rod reduction device comprises; an actuator having a drive surface; a rod engagement element for engaging a rod and moving the rod upon movement of the actuator, and a spring member positioned between the drive surface of the actuator and the rod engagement element; actuating the actuator to cause the rod engagement element to advance the rod towards a bone anchor, and maintaining a controlled force between the rod engagement element and the rod upon movement of the rod relative to the actuator. - View Dependent Claims (35, 36, 37, 38)
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Specification