Distraction screw for skeletal surgery and method of use
First Claim
1. A distraction screw adaptable for surgical work on a mammalian bone structure, comprising:
- (a) a proximal segment having an elongated body with an internal bore extending through the length of the elongated body;
(b) a deployable member disposed within the internal bore of the elongated body and adapted to be retractably deployed outside the internal bore; and
(c) a distal segment including a head portion and a threaded shank portion and being detachably coupled to the elongated body and engageable with the proximal segment for implantation onto the bone structure.
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Accused Products
Abstract
An improved distraction bone screw and a method for its use are described. The distraction screw is comprised of an implantable distal segment and a detachably secured proximal segment. The distal segment includes a head portion and a threaded shank portion. The proximal segment is represented as an elongated body having an internal bore that extends through its length. A deployable member is disposed within the bore, which is extendible outside the internal bore to securely couple to the distal segment. As an assembly, the distraction screw is used to affix and realign bone during surgical reconstruction. Upon completion of the surgical work, the proximal segment is removed and the distal segment is left attached to the reconstructed bone. Securely affixed, the distal segment provides an additional point of fixation for the skeletal plates that are used to preserve the bony alignment while bone healing occurs. The affixed distal segment will also provide a ready mechanism for distraction screw replacement at the time of surgical revision without obligatory plate removal. Different embodiments of the proximal segment, distal segment and the rotational locking mechanisms which inhibit the rotation of one segment relative to the other during deployment were also described. In addition, in cases where the distraction screw must be placed into the bone at an inclined angle, poly-axial heads were provided so that proper skeletal plate placement can still be accomplished.
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Citations
53 Claims
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1. A distraction screw adaptable for surgical work on a mammalian bone structure, comprising:
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(a) a proximal segment having an elongated body with an internal bore extending through the length of the elongated body;
(b) a deployable member disposed within the internal bore of the elongated body and adapted to be retractably deployed outside the internal bore; and
(c) a distal segment including a head portion and a threaded shank portion and being detachably coupled to the elongated body and engageable with the proximal segment for implantation onto the bone structure. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45)
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46. A method for implanting a prosthetic device onto a mammalian bone structure comprising the steps of:
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(a) positioning on the mammalian bone structure a distraction screw, which comprises a proximal segment having an elongated body with an internal bore extending through the length of the elongated body;
a deployable member disposed within the internal bore of the elongated body and adapted to be retractably deployed outside the internal bore and a prosthetic device including a head portion and a threaded shank portion and being detachably coupled to the elongated body;
(b) rotatably manipulating the distraction screw to effect the threading and affixation of the shank portion onto the mammalian bone structure; and
(c) detaching the elongated member segment from the prosthetic device onto the mammalian bone structure. - View Dependent Claims (47, 48)
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49. A method for effecting proper alignment of a skeletal plate in affixation along the anatomically desired plane of a cervical spine, comprising the steps of:
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(a) positioning at a predefined location along the anatomically desired plane of a cervical spine a distraction screw, which comprises a proximal segment having an elongated body with an internal bore extending through the length of the elongated body;
a deployable member disposed within the internal bore of the elongated body and adapted to be retractably deployed outside the internal bore and a prosthetic device including a head portion and a threaded shank portion and being detachably coupled to the elongated body;
(b) rotatably manipulating the distraction screw to effect the threading and affixation of the shank portion onto the predefined location of the cervical spine;
(c) detaching the elongated member segment from the prosthetic device onto the mammalian bone structure; and
(d) coupling the skeletal plate to the prosthetic device.
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50. A method for bone distraction for a cervical spine, comprising the steps of:
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(a) positioning a pair of distraction screws each at a predefined location respectively of a pair of cervical bones interposed by a disc, each of the distraction screws comprising a proximal segment having an elongated body with an internal bore extending through the length of the elongated body;
a deployable member disposed within the internal bore of the elongated body and adapted to be retractably deployed outside the internal bore; and
a distal segment including a head portion and a threaded shank portion and being detachably coupled to the elongated body;
(b) rotatably manipulating the distraction screws to effect the threading and affixation of the shank portions onto the respective predefined locations of the cervical bones; and
(c) manipulating the distraction screws to effect bone distraction. - View Dependent Claims (51)
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52. A method for implanting a prosthetic device onto a mammalian bone structure comprising the steps of:
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(a) assembling a distraction screw, which comprises a proximal segment having an elongated body with an internal bore extending through the length of the elongated body;
a deployable member disposed within the internal bore of the elongated body and adapted to be retractably deployed outside the internal bore and a prosthetic device including a head portion and a threaded shank portion and being detachably coupled to the elongated body;
rotatably manipulating the distraction screw to effect the threading of the shank portion onto the mammalian bone structure; and
(b) detaching the elongated member segment from the prosthetic device onto the mammalian bone structure.
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53. A method for reducing the stress concentration of a distraction hole opening following bone distraction, comprising the steps of:
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(a) assembling a distraction screw, which comprises a proximal segment having an elongated body with an internal bore extending through the length of the elongated body;
a deployable member disposed within the internal bore of the elongated body and adapted to be retractably deployed outside the internal bore and a prosthetic device adapted to effect the distraction hole opening, wherein the prosthetic device includes a head portion and a threaded shank portion and being detachably coupled to the elongated body;
(b) rotatably manipulating the distraction screw to effect the threading and affixation of the shank portion onto the mammalian bone structure; and
(c) detaching the elongated member segment from the prosthetic device, which remains in the distraction hole opening of the mammalian bone structure.
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Specification