Obviousness

Obviousness Analysis of US12268397 under 35 U.S.C. § 103

This analysis will identify combinations of prior art references that could render the claims of US patent 12268397 obvious to a person having ordinary skill in the art (PHOSITA), and explain the motivation for such combinations. The provided "Prior art keywords" from the patent document itself will be considered when reviewing the cited prior art.

Prior Art References (from US12268397B2 - Google Patents):

The patent document US12268397B2 lists numerous "Prior art keywords" and "Citations." For the purpose of this obviousness analysis, we will focus on the cited patents and applications that directly relate to bone cutting guides and similar surgical procedures. The direct "Prior art keywords" listed are: "metatarsal," "guide slot," "bone cutting," "cut," and "cutting guide."

Key cited patents from the "Citations" section that appear most relevant to bone cutting guides and bone manipulation in foot surgery include:

• US4409973A (Neufeld, 1983): "Method and apparatus for corrective osteotomy"
• US4501268A (Comparetto, 1985): "Bone wedge guidance system"
• US4502474A (Comparetto, 1985): "Bone wedge guidance system"
• US4565191A (Slocum, 1986): "Apparatus and method for performing cuneiform osteotomy"
• US4627425A (Reese, 1986): "Osteotomy appliances and method"
• US4708133A (Comparetto, 1987): "Arcuate bone cutter and wedge guide system"
• US4750481A (Reese, 1988): "Osteotomy appliances and method"
• US4757810A (Reese, 1988): "Osteotomy apparatus and method"
• US4952214A (Ohio Medical Instrument Co., Inc., 1990): "Arcuate osteotomy blade, blade guide, and cutting method"
• US5042983A (Rayhack, 1991): "Precision bone cutting guide"
• US5176685A (Rayhack, 1993): "Precision bone cutting guide"
• US5449360A (Schreiber, 1995): "Osteotomy device and method"
• US5529075A (Clark, 1996): "Fixation device and method for repair of pronounced hallux valgus"
• US5601565A (Huebner, 1997): "Osteotomy method and apparatus"
• US5620448A (Arthrex, Inc., 1997): "Bone plate system for opening wedge proximal tibial osteotomy"
• US5643270A (Combs, 1997): "Multi-plane curvilinear saw, guide and method"
• US5722978A (Jenkins, Jr., 1998): "Osteotomy system"
• US5843085A (Graser, 1998): "Device for repair of hallux valgus"
• US5911724A (Mathys Medizinaltechnik Ag, 1999): "Instrument for adjustment osteotomy of a lower extremity"
• US5980526A (Orthopaedic Innovations, Inc., 1999): "Wedge osteotomy device including a guide for controlling osteotomy depth"
• US6030391A (Micropure Medical, Inc., 2000): "Alignment gauge for metatarsophalangeal fusion surgery"
• US6391031B1 (Toomey, 2002): "Device for the repair of a hallux valgus deformity"
• US20040039394A1 (Conti, 2004): "Ankle fusion guide and method"
• US6755838B2 (Newdeal S.A., 2004): "Arthrodesis guide for angularly positioning joint bones"
• US20050251147A1 (Novak, 2005): "Open wedge osteotomy system and surgical method"
• US20050273112A1 (Mcnamara, 2005): "Three-dimensional osteotomy device and method for treating bone deformities"
• US7097647B2 (Segler, 2006): "Tarsal joint space distractor"
• CH695846A5 (Lottenbach, 2006): "Surgical instrument set for scarf osteotomy of metatarsal of bone, has osteotomy pad including two guiding channels, in which one channel forming acute angle is attached at one of two drilling wires, which are anchored at bones"

This list is not exhaustive but represents a selection of highly relevant prior art that a PHOSITA would be aware of in the field of bone cutting guides and foot surgery.

Obviousness of Claim 1

Claim 1 describes a bunion correction method involving two bone cuts, sequential positioning of guides, and fusion, with specific fixation pin placement.

Combination 1: US5529075A (Clark) + US6030391A (Micropure Medical) + US6755838B2 (Newdeal S.A.)

• US5529075A (Clark): Discloses a fixation device and method for hallux valgus repair, which involves cutting and realigning bones in the foot. It describes fixation pins for holding bone segments during the procedure, including pins inserted into the metatarsal. While not explicitly showing the pins distally of the cutting slot, it teaches the use of fixation pins in the metatarsal for realignment during bunion correction.
• US6030391A (Micropure Medical): Describes an alignment gauge for metatarsophalangeal fusion surgery, emphasizing precise alignment of bones during fusion procedures. This reference highlights the importance of accurate positioning of both metatarsal and cuneiform for fusion.
• US6755838B2 (Newdeal S.A.): Teaches an arthrodesis guide for angularly positioning joint bones. This reference provides the concept of using a guide for making cuts in joint bones and subsequently positioning them for fusion.

Motivation for Combination: A PHOSITA would be motivated to combine these references to achieve a more controlled and precise bunion correction with fusion. Clark teaches the basic bunion repair and metatarsal fixation. Micropure Medical emphasizes the need for accurate alignment for fusion across the joint. Newdeal S.A. provides a guide for angularly positioning bones for fusion. By combining these, a PHOSITA would recognize the benefit of using a guide that allows sequential cuts on both the metatarsal and cuneiform, while maintaining alignment with fixation pins, to achieve optimal fusion. The placement of pins distally to the guide slots, as specified in Claim 1, would be a matter of design choice to avoid interference with the cutting member or to provide optimal leverage for alignment, which would be apparent to a skilled surgeon. The sequential nature of cutting the metatarsal, adjusting, then cutting the cuneiform, and then fusing, would also be an obvious procedural flow given the goal of realigning and fusing a joint.

Obviousness of Claim 20

Claim 20 builds on Claim 1, adding specifics about parallel fixation pins, dorsal surface attachment, lifting the first guide, and attaching the second guide to both metatarsal and cuneiform with a third pin.

Combination 2: Combination 1 (Clark + Micropure Medical + Newdeal S.A.) + US5042983A (Rayhack) + US4565191A (Slocum)

• US5042983A (Rayhack): Discloses a "Precision bone cutting guide" that could incorporate the concept of precise, parallel pin placement for stability. While not explicitly describing dorsal surface attachment for the foot, it teaches precision guides.
• US4565191A (Slocum): Describes an "Apparatus and method for performing cuneiform osteotomy," directly addressing cuts in the cuneiform and the need for fixation in that bone.

Motivation for Combination: Starting from the motivation for Combination 1 (controlled bunion correction with fusion), a PHOSITA would seek to improve stability and accuracy. Rayhack's precision guides, specifically regarding parallel pin placement, would be an obvious choice to improve the stability of the first guide on the metatarsal. The concept of attaching a guide to the dorsal surface of the metatarsal is a common surgical approach for accessibility and would be evident to a surgeon. The step of "lifting the first guide off the first fixation pin and the second fixation pin" would be a logical procedural step to allow for the placement of the second guide or manipulation of the bone, rather than an inventive step. Slocum's focus on cuneiform osteotomy provides a clear motivation for attaching a guide to the cuneiform (using a third fixation pin) to facilitate the cut on that bone, while also maintaining attachment to the metatarsal via the existing pins for overall stability and alignment during the multi-bone procedure. The use of a saw blade is a standard cutting member in osteotomies.

Obviousness of Claim 29

Claim 29 further specifies the bones as first metatarsal and first cuneiform, specifies the first and second fixation pins are substantially perpendicular to the dorsal surface, the third fixation pin is at a skewed angle, and adds a compression step.

Combination 3: Combination 2 (Clark + Micropure Medical + Newdeal S.A. + Rayhack + Slocum) + US7097647B2 (Segler)

• US7097647B2 (Segler): Discloses a "Tarsal joint space distractor," which explicitly addresses the manipulation of joint spaces, including compression.
• General Surgical Knowledge: The identification of "first metatarsal" and "first cuneiform" is simply specifying the common anatomical location for bunion correction (Lapidus procedure). The insertion of fixation pins substantially perpendicular to the dorsal surface is a standard practice for stable bone fixation. Skewed angles for pins are also a known technique to enhance fixation or achieve specific bone fragment manipulation, particularly in foot and ankle surgery.

Motivation for Combination: Building upon the improvements of Combination 2, a PHOSITA would naturally consider further optimizing the fusion outcome. Segler's distractor demonstrates the known utility of compressing joint spaces to promote fusion. Integrating a compression step after the cuts and alignment, but before final fusion, is a well-established surgical principle to achieve better bone contact and accelerate healing. The specific mention of first metatarsal and first cuneiform is a routine anatomical designation for this type of procedure. The perpendicular insertion of the first two pins is a common way to achieve stable fixation, and the use of a skewed third pin on the cuneiform is a known technique to provide additional rotational control or optimize fixation in smaller bones or complex geometries, which would be an obvious variation to a skilled surgeon seeking improved stability and alignment for the fusion.

Conclusion for Obviousness:

Given the state of the prior art, as evidenced by the cited patents, a PHOSITA would have been motivated to combine these existing elements and techniques to arrive at the methods described in US12268397. The individual components (bone cutting guides, fixation pins, methods for osteotomy and fusion, alignment tools, and distraction/compression devices) are all present in the prior art. The specific combinations and procedural steps, while presenting a detailed method, represent logical advancements and design choices that would be apparent to a skilled surgeon aiming for improved precision, stability, and fusion outcomes in bunion correction surgery.