A closure for an open headed medical implant, such as a bone screw. The closure having a cylindrical body having an axis of rotation and also having a radially outer surface with a thread or other guide and advancement structure thereon. The body having a plurality of apertures that open onto a top
A closure for an open headed medical implant, such as a bone screw. The closure having a cylindrical body having an axis of rotation and also having a radially outer surface with a thread or other guide and advancement structure thereon. The body having a plurality of apertures that open onto a top surface of the body and that are parallel to but spaced from the axis of rotation. The closure also has a break-off head centrally attached by a neck to the top surface of the body.
대표청구항▼
1. A multi-part threaded closure plug for operably closing, with the use of a tool, a top portion of a channel between a set of arms of a bone anchor, the channel configured to receive a rod, the set of arms having top surfaces defining a top of the bone anchor and internal mating helically wound ra
1. A multi-part threaded closure plug for operably closing, with the use of a tool, a top portion of a channel between a set of arms of a bone anchor, the channel configured to receive a rod, the set of arms having top surfaces defining a top of the bone anchor and internal mating helically wound radial splay preventing threads extending downward from the top surfaces to at least partially define an axial bore of the bone anchor, the threads being configured to pull the arms toward one another when engaged with the plug, and the bone anchor axial bore having an outer circumference with a diameter partially interrupted and transected by the channel, the multi-part threaded closure plug comprising: a body including a closed ring having an outer surface with helically wound radial splay preventing threads, the body further including a threaded central bore extending between a top surface and a bottom surface of the body about a central axis, a plurality of spaced-apart tool mating structures formed within the top surface of the body and extending partially down into the body, the plurality of spaced-apart tool mating structures configured to receive the tool to threadably advance and tighten down the body between the set of arms as the helically wound radial splay preventing threads of the outer surface engage the internal mating helically wound radial splay preventing threads of the set of arms in a threaded splay preventing mating relationship; anda set screw having an outer surface with continuous radial threads, the set screw including a lower portion that is closed off by a continuous bottom surface, the continuous bottom surface configured to engage and lock the rod within the channel as the continuous radial threads of the outer surface of the set screw engage the threaded central bore of the body, such that each part of the multi-part threaded closure plug is positionable entirely within a perimeter of the bone anchor axial bore outer circumference in a locked position. 2. The multi-part threaded closure plug of claim 1, wherein the set screw includes a second tool mating structure for receiving a second tool. 3. The multi-part threaded closure plug of claim 2, wherein the set screw is threadably secured within the body threaded central bore with the second tool after the body is threadably secured within bone anchor axial bore with the first tool. 4. The multi-part threaded closure plug of claim 1, wherein the arm top surfaces of the anchor body remain uncovered when the set screw continuous bottom surface engages and locks the rod within the channel. 5. The multi-part threaded closure plug of claim 1, wherein the plurality of spaced-apart tool mating structures each include a square shaped opening onto the top surface of the body. 6. The multi-part threaded closure plug of claim 1, wherein a top surface of the set screw does not extend above the bone anchor arm top surfaces after the set screw engages the rod within the channel in the locked position. 7. The multi-part threaded closure plug of claim 6, wherein the set screw further comprises a break-off head. 8. The multi-part threaded closure plug of claim 1, wherein the plurality of spaced-apart tool mating structures are spaced from the central axis and the outer surface of the body. 9. The multi-part threaded closure plug of claim 1, wherein the continuous bottom surface of the set screw is substantially flat across the width thereof. 10. The multi-part threaded closure plug of claim 1, wherein the plurality of spaced-apart tool mating structures includes at least three tool mating structures. 11. The multi-part threaded closure plug of claim 1, wherein the continuous bottom surface of the set screw has an outer thread diameter less than a diameter of the rod. 12. A medical implant for securing a rod to a bone, the medical implant comprising: a bone anchor head including a channel formed between a set of upright arms, the upright arms having top surfaces and internal splay preventing threads extending downward from the top surfaces to at least partially define a discontinuous threaded axial bore having a circumference that is partially interrupted and transversely transected by the channel, the channel configured to receive the rod in a lower portion thereof, the channel having an upper portion including the internal splay preventing threads;anda multi-part closure for closing the upper portion of the channel, each part of the multi-part closure threadably positionable entirely within the circumference of the threaded axial bore in a locked position, the multi-part closure having external splay preventing threads engageable to the internal splay preventing threads of the set of upright arms in a threaded splay preventing mating relationship that includes pulling of the arms toward one another, wherein the multi-part closure includes a body and a set screw, the body comprising a closed ring with an outer radial surface having the external splay preventing threads formed therein, a threaded central bore configured to receive the set screw, and a top surface oppose a bottom surface. 13. The medical implant of claim 12, wherein the multi-part closure includes two parts. 14. The medical implant of claim 12, wherein the body includes a plurality of tool mating apertures formed in the top surface and spaced apart from each other. 15. The medical implant of claim 14, wherein the plurality of tool mating apertures further comprises four tool mating openings. 16. The medical implant of claim 14, wherein the plurality of tool mating apertures have a square shape. 17. The medical implant of claim 12, wherein the set screw includes a closed lower portion having a continuous and substantially flat bottom surface across a width thereof. 18. The medical implant of claim 12, wherein the body is inserted and advanced between the set of arms prior to the set screw being advanced in the body. 19. The medical implant of claim 12, wherein the body is inserted and advanced between the set of arms without the set screw in place. 20. The medical implant of claim 12, wherein the multi-part closure has a low profile compared to the top surfaces of the upright arms. 21. The medical implant of claim 12, wherein the top surfaces of the upright arms remain uncovered when the rod is secured within the bone anchor head channel by the multi-part closure locked position. 22. A threaded splay preventing closure for operably closing, with the use of a tool, a top portion of a channel between a set of arms of a bone anchor, the channel configured to receive a rod, each of the arms having a threaded splay preventing internal surface, the threaded splay preventing closure comprising: a body comprising a closed ring with a threaded splay preventing radial outer surface, a top surface, a bottom surface, a central bore that is threaded and extends between the top surface and the bottom surface about a central axis, and a plurality of equally spaced-apart tool mating structures formed within the top surface and extending partially down into the body configured to receive the tool to threadingly advance the body between the set of arms of the bone anchor as the threaded splay preventing radial outer surface of the body threadably engages the threaded splay preventing internal surface of each of the set of arms in a threaded mating relationship, the threaded mating relationship including pulling the arms toward one another; anda set screw configured to be inserted in the central bore. 23. The threaded splay preventing closure of claim 22, wherein the plurality of equally spaced-apart tool mating structures includes four tool mating structures that are non-axially located with respect to each other. 24. The threaded splay preventing closure of claim 22, wherein the threaded mating relationship exerts force drawing the set of arms towards each other as the body is threadedly advanced between the set of arms. 25. A closure for operably closing a top portion of a channel between a set of arms of a bone anchor, the channel configured to receive a rod, the set of arms having an internal threaded surface with a discontinuous splay preventing helically wound guide and advancement structure, the closure comprising: a body including a closed ring with an outer threaded surface having a splay preventing helically wound guide and advancement structure for rotationally mating with the internal threaded surface, the body further including a threaded central bore extending between a top surface and a bottom surface about a central axis, a plurality of spaced-apart tool mating structures formed within the top surface and extending partially down into the body, the plurality of spaced-apart tool mating structures configured to threadably advance the body between the set of arms as the outer threaded surface of the body engages the internal threaded surface of the set of arms and pulls the arms toward one another without causing the set of arms to splay open at a top thereof; anda set screw with a radial outer surface having continuous threads, the set screw having a lower portion that is closed off by a continuous flat bottom surface, the continuous flat bottom surface configured to engage and lock the rod within the channel as the continuous threads of the radial outer surface of the set screw engage the threaded central bore of the body. 26. The closure of claim 25, wherein the body and the set screw are positionable entirely within the set of arms and below the top of the set of arms. 27. The closure of claim 25, wherein no portion of the body or the set screw extends beyond the top of the set of arms once engaged. 28. The closure of claim 25, wherein the plurality of spaced-apart tool mating structures each include a square shaped opening onto the top surface of the body that are non-axially located with respect to each other. 29. The closure of claim 25, wherein the plurality of spaced-apart tool mating structures are each shaped as bores. 30. The closure of claim 25, wherein the continuous flat bottom surface of the set screw has an outer thread diameter less than a diameter of the rod. 31. A closure for operably closing a top portion of a channel between a set of arms of a bone anchor, the channel configured to receive a rod, each of the arms having an inner surface with an internal helically wound threaded structure formed therein, the closure comprising: a body comprising a closed ring with a radial outer surface having an external helically wound threaded structure, a top surface, a bottom surface, a central bore that is threaded and extends between the top surface and the bottom surface about a central axis of the body, and a plurality of equally spaced-apart tool mating structures formed within the top surface and extending partially down into the body and configured to threadingly advance the body between the set of arms of the bone anchor as the external helically wound threaded structure of the radial outer surface of the body engages the internal helically wound threaded structure of the inner surface of each of the set of arms; anda set screw configured to be inserted in the central bore for engaging the rod,wherein the engagement of the internal and external helically wound threaded structures is configured to pull the arms toward one another and prevent a splaying open of the set of arms at the top portion of the channel. 32. A closure for operably closing, with the use of a tool, a top portion of a channel between a set of arms of a bone anchor, the channel configured to receive a structure, the set of arms having an internal threaded surface with a discontinuous splay preventing helically wound guide and advancement structure, the closure comprising: a body including a closed ring with an outer threaded surface having a splay preventing helically wound guide and advancement structure for rotationally mating with the internal threaded surface, the body further including a threaded central bore extending between a top surface and a bottom surface about a central axis, a plurality of spaced-apart tool mating structures formed within the top surface and extending partially down into the body, the plurality of spaced-apart tool mating structures configured to receive the tool to threadably advance the body between the set of arms as the outer threaded surface of the body engages the internal threaded surface of the set of arms, with the engagement between the threaded surfaces pulling the arms toward one another and preventing the set of arms from splaying open at a top thereof and the bottom surface compressively engaging the structure received within the channel; anda set screw with a radial outer surface having continuous threads, the set screw having a lower portion that is closed off by a continuous bottom surface, the continuous bottom surface configured to engage and lock the structure received within the channel as the continuous threads of the radial outer surface of the set screw engage the threaded central bore of the body. 33. The closure of claim 32, wherein the structure received within the channel is engaged by the bottom surface of the body. 34. A closure comprising: a closed ring having top surface and bottom surface portions;an outer threaded surface of the closed ring having a splay preventing helically wound guide and advancement structure;a threaded central bore extending entirely between and completely through the top and bottom surface portions of the closed ring about a central axis of the closed ring; anda plurality of tool mating structures formed within the top surface portion and extending partially down into the closed ring so as to be spaced from the bottom surface portion, the plurality of tool mating structures spaced apart from each other and configured to advance the closed ring between a set of arms of a bone anchor in a threaded engagement as the outer threaded surface engages an internal threaded surface of the set of arms having a complimentary splay preventing helically wound guide and advancement structure, the threaded engagement pulling the arms toward one another and preventing the set of arms from splaying open; anda set screw configured to be inserted into the central bore. 35. The closure of claim 34, wherein the bottom surface portion of the closed ring has a lower surface that is tightened down against a structure disposed within a channel formed between the set of arms using a tool to engage the plurality of tool mating structures to turn the closure. 36. The closure of claim 35, wherein the structure is a rod. 37. The closure of claim 35, wherein the set screw has a continuous bottom surface portion configured to engage and lock the structure within the channel as continuous threads on an outer surface of the set screw engage the threaded central bore of the closed ring. 38. A closure comprising: a closed ring body having a top surface opposite a bottom surface and an outer surface with splay preventing radial threads;a threaded central bore extending between the top surface and the bottom surface about a central axis of the body;a plurality of tool mating structures formed within the top surface and extending only partially down into the closed ring body, the plurality of tool mating structures configured to advance the closed ring body between a set of arms of a bone anchor to operably close a top portion of a channel defined by the set of arms, the channel configured to receive a structure, the set of arms having splay preventing internal threads at least partially defining an axial bore of the bone anchor having a bore outer diameter, wherein engagement of the splay preventing internal threads to the splay preventing radial threads pulls the arms toward one another and inhibits a splaying of the set of arms;a set screw with a radial outer surface having continuous threads; anda continuous bottom surface closing a lower portion of the set screw and configured to compress the structure into a locked position within the channel as the continuous threads of the radial outer surface of the set screw engage the threaded central bore, the locked position including an entirety of the set screw and the closed ring body positioned within a perimeter of the bore outer diameter. 39. The closure of claim 38, wherein the structure is a rod. 40. A multi-part threaded closure plug for operably closing a top portion of a channel between a set of arms of a bone anchor so as to not cause a splaying open at the top portion, the channel configured to receive a rod, the set of arms having a top surface and an internal discontinuous helically wound radial thread extending downward from the top surface to at least partially define an axial bore of the bone anchor, the axial bore having an outer circumference with a major diameter partially interrupted and transected by the channel, the multi-part threaded closure plug comprising: a body comprising a closed ring having an outer surface with a helically wound radial thread, the body including a threaded central bore extending between a top surface and a bottom surface about a central axis;a plurality of spaced-apart tool mating structures formed within the top surface and extending partially down into the body so as to not extend into a lower portion of the body having a bottom surface, the plurality of spaced-apart tool mating structures configured to threadably advance and tighten down the body between the set of arms as the helically wound radial thread on the outer surface of the body engages the internal discontinuous mating helically wound radial thread on the set of arms in a threaded splay inhibiting mating relationship so as to pull the arms toward one another and capture the rod positioned within the channel; anda set screw having an outer surface with a continuous radial thread, the set screw including a lower portion that is closed off by a flat continuous bottom surface, the flat continuous bottom surface configured to engage and lock the rod within the channel as the continuous radial thread on the outer surface of the set screw engages the threaded central bore of the body such that each part of the multi-part threaded closure plug is positioned entirely within a perimeter of the axial bore outer circumference in the locked position with the top surface on the set of arms being uncovered in the locked position.
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이 특허에 인용된 특허 (29)
Huene Donald R., Absorbable bone screw and tool for its insertion.
Biedermann, Lutz; Matthis, Wilfried, Locking assembly for securing a rod member in a receiver part for use in spinal or trauma surgery, bone anchoring device with such a locking assembly and tool therefor.
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