Method and apparatus for delivering material to a desired location
AssigneeHarrington Arthritis Research Center
InventorsRobert R. Karpman, Thomas M. Hansen, Anna G. U. Brantley
Life of this patent
Estimating the term…
Abstract
A method and apparatus for the effective delivery of a material, such as cement, to a desired location in a human. In one embodiment of the invention, a bone screw, including a head portion, a cannulated slotted shaft portion and a tip portion, includes an injection site for removably attaching an injection device, such as a syringe. Since the shaft portion is slotted, injected material flows from the cannulated shaft and is able to exit into surrounding tissue through the slot in the shaft.
Claims34
A device for forming fixation masses about a portion of a bone consisting of:
- a head portion having an injection site for releasably attaching an injection device to said injection site;
- a threaded shaft portion having a proximal portion and a distal portion, said shaft portion terminating at a tip portion;
- a cannula extending along at least a portion of a length of said shaft portion from said injection site on said head portion substantially along a center-line within said shaft portion, said cannula configured to receive a fixation substance;
- and
- at least one slot in said proximal portion and at least one slot in said distal portion, said slots in fluid communication with the cannula for delivery of said fixation substance about said device and in proximity to a cortex portion of the bone.
A bone anchoring system comprising:
- a bone anchoring device;
- including
- a head portion at a proximal end of said anchoring device, the head portion having an attachment means for attaching an injection device and an engagement means for engaging with a tool for inserting said anchoring device;
- an elongate shaft portion having an external threaded portion and a cannula extending along at least a portion of the shaft portion, said cannula suitably configured to internally deliver an anchoring substance;
- a tip portion at a distal end of shaft portion;
- and
- at least one delivery at said proximal end and at least one delivery port at said distal end, said delivery ports extending from said cannula to deliver said anchoring substance near a bone surface and to form an anchoring mass about said anchoring device and the bone, and a bone plate engaged with said head portion of said bone anchoring device, said bone plate having a surface for at least partial contact with the bone.
A method for strengthening fixation of a fixation device to a bone comprising the steps of:
- (a) providing a fixation device;
- (b) drilling a pilot hole in the bone;
- (c) inserting said fixation device into said pilot hole;
- (d) injecting a fixation substance into a cannula of said fixation device;
- (e) delivering said fixation substance about the bone through a plurality of slots extending outward from said cannula;
- (f) forming areas of fixation masses near at least one of a proximal portion and a distal portion of said fixation device and the bone.
A method of forming an anchor for an internal fixation device in a vertebral body comprising the steps of:
- (a) inserting at least one fixation device into the vertebral body, said fixation device having a cannula and at least one slot extending outward from said cannula;
- and
- (b) delivering through said slot an anchoring substance to form a mass about said fixation device and in proximity to an outermost region of a centrum area of the vertebral body.
A method for increasing the holding power of a bone fixation device comprising the steps of:
- (a) engaging said device within the bone;
- (b) disposing a bone cement through a bore in said device and through at least two openings in said device;
- (c) disbursing said cement through a first opening proximate to a head portion of said device near an inner cortex portion of the bone, and through a second opening proximate to a tip potion of said device near an outer cortex portion of the bone;
- and
- (d) curing said cement to form a cement mass about said device and the bone.
Dependencies are inferred from the claim text.