BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 depicts a perspective view of the base of the cutting apparatus of the present invention.
FIG. 2 depicts a perspective view of a blade guide of the present invention.
FIG. 3 depicts an overhead view of a blade guide of the present invention with slots formed at normal angles relative to each other.
FIG. 4 depicts an overhead view of a blade guide of the present invention with slots formed at acute angles relative to each other.
FIG. 5 depicts a side view of a blade guide of the present invention.
FIG. 6 depicts a perspective view of a spacing member of the present invention.
FIG. 7 depicts a perspective view of a biasing bolt of the present invention.
FIG. 8 depicts a perspective view of the base member of the present invention having a section of donor bone disposed on said base member.
FIG. 9 depicts a perspective view of the base member of the present invention having a section of donor bone disposed on said base member with a blade guide installed.
FIG. 10 depicts a perspective view of the cutting apparatus of the present invention holding a section of donor bone.
FIG. 11 depicts a side view of the cutting apparatus of the present invention holding a section of donor bone.
FIG. 12 depicts a detailed side view of the cutting apparatus of the present invention holding a section of donor bone.
FIG. 13 depicts a perspective view of the cutting apparatus of the present invention holding a section of donor bone while being cut.
FIG. 14 depicts a perspective view of the cutting apparatus of the present following the cutting of a section of donor bone.
DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT OF THE INVENTION
Referring to the drawings, FIG. 1 depicts a perspective view of base 10 of the apparatus of the present invention. Base 10 has substantially planar surface 11. In most applications, substantially planar surface 11 is situated in a substantially horizontal orientation. Elongate upright member 12 extends along one side of said base 10. In the preferred embodiment, base 10 is formed from sheet stock or other similar material so that upright member 12 is not solid. Upright member defines substantially vertical surface 13, while junction 14 forms the transition between substantially planar surface 11 and substantially vertical surface 13 of upright member 12. In the preferred embodiment, junction 14 forms a right angle; however, the shape and/or radius of curvature of junction 14 can be beneficially configured to accommodate the outer (generally cylindrical) surface of a donor bone.
Still referring to FIG. 1, slotted tracks 15 are disposed along planar surface 11 of said base 10. In the preferred embodiment, tracks 15 are oriented in a direction that is substantially perpendicular to the longitudinal axis of upright member 12 (as well as junction 14), and have enlarged sections 15a opposite upright member 12. Opening 16 is formed in upright member 12 (including junction 14 and substantially vertical surface 13) and substantially planar surface 11 of base 10. In the preferred embodiment, upright fingers 17 are formed along a portion of substantially planar surface 11 of base 10; said fingers 17 are aligned with opening 16. Said fingers 17 have horizontal components 17A and and vertical components 17b and are integrally formed with planar surface 11. Further, said fingers 17 beneficially stand out relative to substantially planar surface 11, junction 14 and substantially vertical surface 13.
FIG. 2 depicts a perspective view of a movable blade guide 20 of the present invention. Blade guide 20 comprises body section 21 having opposing L-shaped track mounts 22 and bone holder 23. In the preferred embodiment, bone holder 23 defines inner surface 25 having a geometry that can accommodate the outer surface of a section of donor bone. In most cases, inner surface 25 is curved to accommodate the generally cylindrical surface of a donor bone; however, it is to be observed that surface 25 can have any number of different shapes to match a particular donor bone to be cut. A plurality of slots 24 extends through bone holder 23. In the preferred embodiment, slots 24 include wider areas 24a along the leading edge of bone holder 23. Bracket member 26 defining lip 27 extends from body section 21 of blade guide 20 along the opposite side of said blade guide 20 from bone holder 23.
FIG. 3 depicts an overhead view of a blade guide 20 of the present invention. Bracket member 26 extends from body section 21 of blade guide 20 along the opposite side of blade guide 20 from bone holder 23. A plurality of slots 24 extends through bone holder 23. In FIG. 3, slots 24 are oriented parallel to one another and at right angles relative to the longitudinal axis of bone holder 23. In the preferred embodiment, slots 24 have wider areas 24a at the leading edge of bone holder 23. FIG. 4 depicts an overhead view of a blade guide 20 of the present invention that is generally identical to the blade guide depicted in FIG. 3, except that slots 24 are oriented at oblique angles relative to one another. It is to be observed that such slots 24 can be oriented any number of ways, as desired, to accomplish a particular graft geometry.
FIG. 5 depicts a side view of blade guide 20 of the present invention having body section 21 and bone holder 23. Bracket member 26 defining lip 27 extends from body section 21 of blade guide 20 along the opposite side of blade guide 20 from bone holder 23. Bone holder 23 defines curved inner surface 25 having a geometry that can beneficially accommodate the outer (generally cylindrical) surface of a donor bone. A plurality of ribs 28 can be disposed along inner surface 25 of bone holder 23. Optional ribs 28 improve the ability of bone holder 23 to secure a section of donor bone held by such bone holder 23 and prevent movement of such donor bone.
FIG. 6 depicts a perspective view of a spacing member 30 of the present invention. Spacing member 30 comprises body section 31, face member 32 and upright lip 34. Aperture 33 extends through face member 32. FIG. 7 depicts a perspective view of biasing bolt 40 of the present invention. Biasing bolt 40 has threaded bolt section 41, as well as head 42. In the preferred embodiment, biasing bolt 40 also has body section 43 having a larger diameter than that of aperture 33 in face member 32 of spacing member 30.
FIG. 8 depicts a perspective view of base member 10 of the present invention having a section of donor bone 90 disposed on said base member. Donor bone section 90 is beneficially placed generally on junction 14 formed between planar surface 11 and substantially vertical surface 13 of upright member 12. More particularly, said donor bone section 90 is disposed across upright fingers 17. In this configuration, donor bone section 90 is generally aligned with tracks 15. Threaded bore 18 is disposed in base 10, and is ideally positioned between tracks 15. The longitudinal axis of threaded bore 18 is substantially parallel to tracks 15.
FIG. 9 depicts a perspective view of base member 10 and blade guide 20 positioned against donor bone section 90. L-shaped track mounts 22 (not shown in FIG. 9) of blade guide 20 are inserted into openings 15a of tracks 15, so that blade guide 20 is slidably disposed within tracks 15 of base 10. Blade guide 20 can travel within tracks 15 along substantially planar surface 11 and can be selectively positioned along planar surface 11 of base 10 relative to fingers 17 (not shown in FIG. 9) and donor bone section 90.
FIG. 10 depicts a perspective view of the cutting apparatus of the present invention securely holding a section of donor bone. Extension 34 (not shown in FIG. 10) of spacing member 30 is received under lip 27 of bracket member 26 of blade guide 20, thereby joining said spacing member 30 to blade guide 20. Donor bone section 90 is beneficially placed generally on junction 14 formed between planar surface 11 and substantially vertical surface 13 of upright member 12. More particularly, said donor bone section 90 is disposed across upright fingers 17. In this configuration, donor bone section 90 is generally aligned with tracks 15. L-shaped track mounts 22 (not shown in FIG. 10) of blade guide 20 are inserted into openings 15a of tracks 15, so that blade guide 20 is slidably disposed within tracks 15 of base 10. Blade guide 20 can travel within tracks 15 along substantially planar surface 11 and can be selectively positioned along planar surface 11 of base 10 relative to fingers 17 (not shown in FIG. 10) and donor bone section 90.
FIG. 11 depicts a side view of the cutting apparatus of the present invention holding a section of donor bone 90. Donor bone section 90 is beneficially seated within junction 14 formed between substantially planar surface 11 and substantially vertical surface 13 of upright member 12. Specifically, donor bone section 90 rests on fingers 17 (not shown in FIG. 11) of base 10. In this configuration, donor bone section 90 is generally aligned with tracks 15 in substantially planar surface 11 of base 10.
Still referring to FIG. 11, blade guide 20 is slidably received within tracks 15 of base 10 and can be selectively positioned along planar surface 11 of base 10 relative to fingers 17 and donor bone section 90. Extension 34 of spacing member 30 is received under lip 27 of bracket member 26 of blade guide 20, thereby joining said spacing member 30 to blade guide 20. Threaded bolt section 41 of biasing bolt 40 extends though aperture 33 (not shown in FIG. 11) of spacing member 30 and is threadably received within threaded bore 18 of base 10. As head 42 of biasing bolt 40 is rotated, threaded bolt section 41 advances within threaded bore 18, forcing body section 43 of biasing bolt 40 into face member 32 of spacing member 30. Spacing member 30 in turn forces blade guide 20 towards donor bone section 90, securing said donor bone section in compression against fingers 17 (not shown in FIG. 11).
FIG. 12 depicts a detailed cross-sectional view of the cutting apparatus of the present invention holding a section of donor bone. Donor bone section 90 having an irregular (that is, not perfectly round) shape is beneficially placed on junction 14 formed between planar surface 11 and substantially vertical surface 13 of upright member 12. In this position, a portion of said donor bone section 90 contacts lower section 17a and upper section 17b of upright fingers 17. In the preferred embodiment, said upright fingers stand proud—that is, stand out—relative to substantially planar surface 11 and substantially vertical surface 13 and have some flexibility. As such, said upright fingers provide a resilient cradle-like surface to beneficially support donor bone section 90. As blade guide 20 is biased against donor bone section 90, curved surface 25 of bone holder 23 acts to secure donor bone section 90 in place between bone holder 23 and upright fingers 17. Optional ribs 28 disposed on curved surface 25 help to secure donor bone section 90 and further prevent unwanted movement of said donor bone section.
FIG. 13 depicts a perspective view of the cutting apparatus of the present invention holding donor bone 90 while being cut. Once donor bone section 90 is secured in place using the apparatus of the present invention as set forth in detail above, precision cuts can be made to donor bone section 90 in order to prepare bone grafts having desired shapes and sizes. Specifically, blade 80 is inserted through slots 24 of blade guide 20 to cut donor bone section 90. Slots 24 allow blade 80 (which can be any number of cutting devices known in the art such as, for example, a saggital saw blade) to move freely within a plane of radical oscillation. Slots 24, ideally having wider opening 24a at the leading edge of bone holder 23 to guide a saw blade into such slots 24, effectively guide the cutting edge of blade 80 through a donor bone section 90 within the desired plane. Said blade 80 can also extend into gaps existing between upright fingers 17 to ensure thorough cutting of donor bone section 90.
In one embodiment of the present invention, slots 24 are situated at fixed spacing intervals relative to one another, and at normal angles relative to the longitudinal axis of donor bone section 90. Openings are also are formed between upright fingers 17 and are aligned with slots 24 of blade guide 20, thereby allowing blade 80 to extend into such openings between upright fingers 17 and freely exit donor bone section 90 upon completion of a cut. Because multiple aligned slots 24 are formed in blade guide 20, two faces of a bone graft can be prepared without repositioning donor bone section 90.
In another variation of the invention, a bone graft with convergent oblique faces can be prepared. An alternative blade guide having slots formed at converging oblique angles relative to the longitudinal axis of donor bone section 90 can be used instead of blade guide 20 depicted in FIG. 13. In yet another embodiment of the invention, a graft combining right and oblique faces can be prepared. An alternative blade guide having slots cut at both normal and oblique angles relative to the longitudinal axis of donor bone section 90 can be used instead of bone guide 20 depicted in FIG. 13.
Once donor bone section 90 is secured in place, precision cuts can be made to donor bone section 90 in order to prepare bone graft(s) having desired shapes and sizes. Blade 80 is inserted through slots 24 of blade guide 20 to cut donor bone section 90. Slots 24 guide the cutting edge of blade 80 through donor bone section 90 within the desired plane.
FIG. 14 depicts a perspective view of the cutting apparatus of the present following the cutting of donor bone section 90. Following such cutting operations, biasing bolt 40 (not shown in FIG. 14) is partially or fully unscrewed and blade guide 20 is removed from donor bone section 90. As depicted in FIG. 14, donor bone section 90 has been cut to form bone graft section 95, having a desired shape and size. During the cutting process, bone graft section 95, which is much smaller than donor bone section 90, is nonetheless supported by certain independently-acting and resilient upright fingers 17. Bone graft section 95 can be utilized in connection with any number of beneficial medical procedures including, but not necessarily limited to, surgical procedures.
The device of the present invention is robust and can be used in virtually any environment, including intra-operative environments such as those operating rooms and/or other facilities used for performing surgical procedures. The components of the present invention can be easily reconfigured and/or interchanged as desired to accommodate different sizes and types of donor bones, and can be easily cleaned and/or autoclaved for repeat use.
The above disclosed invention has a number of particular features which should preferably be employed in combination, although each is useful separately without departure from the scope of the invention. While the preferred embodiment of the present invention is shown and described herein, it will be understood that the invention may be embodied otherwise than herein specifically illustrated or described, and that certain changes in form and arrangement of parts and the specific manner of practicing the invention may be made within the underlying idea or principles of the invention.
Patent Application
20080011137
