Source: http://www.google.com/patents/US5810821?dq=7493558
Timestamp: 2017-06-28 04:29:11
Document Index: 220509491

Matched Legal Cases: ['art.\n4', 'art.\n5', 'art.\n9', 'art.\n10', 'art.\n11', 'art 26', 'art 26', 'art 26', 'art 26', 'art 46', 'art 46', 'art 50', 'art 50', 'art 46', 'art 50', 'art 50', 'art 50', 'art 50', 'art 50', 'art 46', 'art 50']

Patent US5810821 - Bone fixation screw system - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inPatentsA bone fixation screw system and method of utilization thereof is provided for a bone having first and second sections with a fracture interface there between. A preferred embodiment of the bone fixation screw system includes a side plate having a first part for placement adjacent the bone second section...http://www.google.com/patents/US5810821?utm_source=gb-gplus-sharePatent US5810821 - Bone fixation screw systemAdvanced Patent SearchTry the new Google Patents, with machine-classified Google Scholar results, and Japanese and South Korean patents.Publication numberUS5810821 APublication typeGrantApplication numberUS 08/828,406Publication dateSep 22, 1998Filing dateMar 28, 1997Priority dateMar 28, 1997Fee statusPaidAlso published asUS6022352Publication number08828406, 828406, US 5810821 A, US 5810821A, US-A-5810821, US5810821 A, US5810821AInventorsMark V. VandewalleOriginal AssigneeBiomet Inc.Export CitationBiBTeX, EndNote, RefManPatent Citations (14), Non-Patent Citations (2), Referenced by (127), Classifications (14), Legal Events (8) External Links: USPTO, USPTO Assignment, EspacenetBone fixation screw system
US 5810821 AAbstract
1. A bone fixation screw system for a bone having first and second sections with an interface there between, the bone fixation screw system comprising comprising:a side plate having a first part for placement adjacent the bone second section and a second part angled from the first part providing a barrel, the barrel being adapted for insertion into a transsectionally extending bore into the bone in at least the second section of the bone; and a lag screw for positional retention of the first section of the bone with respect to the second section of the bone, the lag screw having a first part of a resorbable material for threaded connection of the lag screw within the bore of the bone in at least the first section of the bone, the lag screw having a second part connected with the first part made from a stronger nonresorbable material. 2. A bone fixation screw system as described in claim 1 wherein the second part of the lag screw is made from a metal.
3. A bone fixation screw system as described in claim 1 wherein the lag screw first part surrounds the lag screw second part at an extreme end of the lag screw second part.
4. A bone fixation screw system as described in claim 3 wherein the lag screw first part surrounds a reduced diameter section of the lag screw second part.
5. A bone fixation screw system as described in claim 4 wherein the lag screw second part has a shoulder between the reduced diameter section and the remainder of the second part of the lag screw.
6. A bone fixation screw system as described in claim 4 wherein the lag screw second part reduced diameter section is tapered towards the lag screw second part extreme end.
7. A bone fixation screw system as described in claim 3 wherein the lag screw second part that is surrounded by the lag screw first part, has a torsional tongue and groove connection with the lag screw first part to aid impartation of torque between the second and first parts of the lag screw.
8. A bone fixation screw system as described in claim 7 wherein the lag screw has an axial longitudinal groove in the lag screw second part and a depth of the axial longitudinal groove in the lag screw second part is progressively increased toward the extreme end of the lag screw second part.
9. A bone fixation screw system as described in claim 3 wherein the lag screw second part that is surrounded by the lag screw first part, has a generally annular tongue and groove connection with the first part to aid axial retention of the lag screw first part to the lag screw second part.
10. A bone fixation screw system as described in claim 9 wherein there are a plurality of annular grooves on the lag screw second part and respective depths of the annular grooves are progressively increased towards the extreme end of the lag screw second part.
11. A bone fixation screw system as described in claim 3 wherein a section of the lag screw second part that is not surrounded by the first part has at least one exterior longitudinal flat along an entire length.
12. A bone fixation screw system as described in claim 1 wherein the lag screw second part can translate through the side plate barrel.
13. A bone fixation screw system as described in claim 12 wherein the lag screw second part is locked from rotation by the side plate barrel.
14. A bone fixation screw system as described in claim 1 further including a compression screw that sets the position of the lag screw with respect to the barrel of the side plate.
15. A bone fixation screw system for a bone having first and second sections with an interface there between, the screw system comprising:a side plate having a first part for placement adjacent the bone second section and a second part angled from the first part providing a barrel, the barrel being adapted for insertion into a transsectionally extending bore of the bone in at least the second section of the bone; and a lag screw for positional retention of a bone having first and second sections with an interface there between, the lag screw including a first part of a resorbable material for threaded connection of the lag screw within the transsectionally extending bore of the bone in at least the first section of the bone, and the lag screw also having a second part made from a stronger nonresorbable metallic material, the lag screw second part having an elongated shank with a reduced diameter stud at an extreme end surrounded and connected with the first part, the stud having a torsional tongue and groove connection with the lag screw first part for impartation of torque to the lag screw first part, and the stud having a generally annular tongue and groove connection with the lag screw first part to aid axial retention of the lag screw first part and wherein the lag screw shank has an exterior longitudinal flat and the shank can be translated through the side plate barrel. 16. A method of treating a bone with first and second sections separated by an interface there between with a fixation screw system comprising:drilling a transsectionally extending bore through the bone penetrating into the first and second sections; threadingly connecting within the transsectionally extending bore of the first bone section, a lag screw with a first part having a male thread of resorbable material and a lag screw second part connected with the first part of a second stronger nonresorbable material; encircling the lag screw with a barrel of a side plate, the barrel being inserted into the bore of the bone in at least the second section of the bone; and locationally attaching the side plate with the second section of the bone. 17. A method of treating a bone with first and second sections separated by an interface there between with a fixation screw system as described in claim 16 further including rotatively locking the lag screw with the barrel of the side plate.
18. A method of treating a bone with first and second sections separated by an interface there between with a fixation screw system as described in claim 16 further including removing the lag screw through the barrel of the side plate without removing the side plate from second section of the bone.
19. A method of treating a bone with first and second sections separated by an interface there between with a fixation screw system as described in claim 18 further including tapping a female thread diameter in the first bone section that is greater than a diameter of the lag screw second part or an inner diameter of the barrel, and threadably connecting a lag screw with a first part with a thread having a diameter greater than the inner diameter of the barrel and at least allowing the resorbable first part of the lag screw first part to partially dissolve before removing the lag screw.
20. A method of treating a bone with first and second sections separated by an interface there between with a fixation screw system as described in claim 16 further including setting the relative position of the bone first section with respect to the second position by a compression screw contacting the side plate and lag screw.
The surgeon then inserts into the bore a lag screw(a specialized form of a bone screw). The lag screw is typically machined from cold worked stainless steel due to strength and biological requirements. The lag screw has an intergral male thread at its forward end. A shank of the lag screw extends rearward from the male threads and passes through the bore in both the first and second bone sections. The lag screw is then rotated by the surgeon to threadably attach the lag screw to the bone first section.
In the healing process the bone will grow into the female threads that were tapped in the first and second bone sections, locking the lag screw in position. Therefore the lag screw cannot be simply rotated to threadably release the lag screw from the bone first section. To release the lag screw a trephine is fitted over the lag screw. The trephine is used to cut a core of bone surrounding the lag screw to allow release of the lag screw. A more detailed review of the present state of the art can be gained by a review of the surgical technique of Frank R. Ebert M.D. Baltimore Md., as described in Biomet Brochure YBMT-415/031595/M © 1995 Biomet, Inc. Warsaw Ind. 46580.
To meet the above noted desires, the present invention is brought forth. In a preferred embodiment, the present invention provides a bone fixation screw system which includes a side plate having a first part for placement adjacent the bone and a second part angled from the first part providing a barrel. The barrel is inserted into a bore of the bone. The bore in the bone intersects a first and second section of the bone that are separated by a fracture interface. A lag screw is threadably connected into the bore in the bone first section. The lag screw of the present invention at a front end has a male thread of a resorbable plastic material. The resorbable material is connected to a stronger metal shaft which includes a shank and a reduced diameter stud. The stud projects forward from the shank. The stud is also surrounded by the male threads.
FIG. 1 illustrates a top of a femur 10 (shown in phantom) having a femoral neck fracture 12 providing an interface between a first bone section or s femoral head 14 and a second bone section or femoral shaft 16. A transsectional bore 18 is drilled from a rear surface 20 of the femoral shaft intersecting the fracture 12 and then penetrating into the femoral head 14. The bore 18 in the femoral head 14 is tapped to have a female thread in a region 22. The bore 18 in a region 23 of the femoral shaft can be reamed to have a slightly larger diameter if desired.
A bone fixation screw system 7 according to the present invention provides a side plate 24. The side plate 24 has a first part 26 for placement adjacent a side of the femoral shaft 16 generally parallel to a major axes 30 of the femur. The side plate 24 is mounted to the femoral shaft 16 by a series of self tapping screws 32. A screw 33 can be used for positional fixing of another minor section 17 of the femur if appropriate. Angled from the side plate first part 26, is a side plate second part or barrel 34. The barrel 34 is integrally connected with the side plate first part 26. The barrel 34 is inserted into the bore 18 from the rear surface 20 of the femur shaft adjacent the femur lateral cortex. The angle the barrel 34 makes with the side plate first part 26 is a matter of selection by the surgeon and typically will be between 150-130 degrees for hip applications. For superacondylar (knee joint applications, not shown) the angle is typically 95 degrees. The barrel 34 (FIG. 7 in phantom) has an interior diameter 38 with two opposing flats 40. The barrel 34 also has adjacent a rear end a counter bore seat 42
Referring additionally to FIGS. 2-8, the second major component of the bone fixation system 7 is a lag screw 44. The lag screw 44 at an extreme forward end has a first part 46 made of the resorbable material. The material can be a plastic such as a copolymer of L-lactic acid and glycolic acid or other suitable alternatives.
The lag screw first part 46 is connected in a torsionally fixed manner with a nonresorbable material second part 50 (FIG. 3). The lag screw second part 50 is machined from a material that is stronger than the material which is used for the lag screw first part 46. The lag screw second part 50 is typically made from the same material that the side plate 24 is made of which is a 316 stainless steel. An outer diameter of the lag screw second part 50 will typically be 12 to 20 millimeters . The lag screw second part 50 must be strong enough to support the femoral head 14 and typically must withstand stress of 90,000 lbf. per square inch. Therefore allowing the lag screw second part 50 to be fabricated from a metal instead of a lower strength material allows the lag screw second part 50 diameter to remain relatively small.
An extreme front end 61 (FIG. 2) of the lag screw first part 46 extends forward from the extreme end 59 (FIG. 3)of the stub 56. A thread outer and inner diameter 72 and 74 excursions are truncated at an extreme front end. The reduction of the inner thread 74 diameter facilitates easier insertion of the lag screw 44. The thread outer diameter 72 is truncated at a rear end 76. The thread outer diameter 72 is typically larger than any diameter of the lag screw second part 50 or the inner diameter 38 of the barrel 34.
In operation the bore 18 is drilled and tapped with a female thread in region 22. The female thread will typically have a diameter equal to the diameter of the male thread 48. The lag screw 44 is threadably connected with the femoral head 14 with careful attention being given to proper alignment of the flats 77. The barrel 34 is then inserted into the bore 18, thereby encircling and locking the lag screw 44 from rotation and thereby preventing inadvertent removal of the lag screw 44.
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helical implant* Cited by examinerClassifications U.S. Classification606/65, 606/80, 606/320, 606/77, 606/286International ClassificationA61B17/00, A61B17/74, A61B17/86Cooperative ClassificationA61B17/8685, A61B2017/00004, A61B17/866, A61B17/746European ClassificationA61B17/74D4, A61B17/86PLegal EventsDateCodeEventDescriptionMar 28, 1997ASAssignmentOwner name: BIOMET INC., INDIANAFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:VANDEWALLE, MARK V.;REEL/FRAME:008654/0470Effective date: 19970327Mar 22, 2002FPAYFee paymentYear of fee payment: 4Jan 4, 2006FPAYFee paymentYear of fee payment: 8Mar 22, 2007ASAssignmentOwner name: BIOMET MANUFACTURING CORP., INDIANAFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:BIOMET, INC.;REEL/FRAME:019051/0362Effective date: 19990601Dec 10, 2007ASAssignmentOwner name: BANK OF AMERICA, N.A., AS ADMINISTRATIVE AGENT FORFree format text: SECURITY AGREEMENT;ASSIGNORS:LVB ACQUISITION, INC.;BIOMET, INC.;REEL/FRAME:020362/0001Effective 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