Obviousness

Based on the provided patent text and its metadata, specific prior art references (e.g., U.S. patents, publications) that were cited by the examiner or are otherwise publicly available for a direct combination analysis under 35 U.S.C. § 103 are not present. The "Prior art keywords" (metatarsal, bone, positioning guide, guide, surgical technique) and "Prior art date" (2015-08-14) indicate the general field of the invention but do not provide specific documents to combine. Without named prior art documents, a detailed obviousness analysis combining specific disclosures cannot be performed.

However, a hypothetical obviousness analysis can be considered, assuming a person having ordinary skill in the art (PHOSITA) in orthopedic foot and ankle surgery would possess general knowledge consistent with the provided keywords by the priority date of August 14, 2015.

The independent claims (1, 14, 27, 30) of US12274481 primarily describe an instrumented surgical technique for correcting bunion deformities and preparing the tarsal-metatarsal joint for fusion. Key features include:

1. A bone positioning guide: This guide has a bone engagement member and a bone contact surface (tip), a threaded shaft with a knob for actuation, and is used to push a first metatarsal laterally towards a second metatarsal to reduce the intermetatarsal angle (transverse plane correction).
2. Multi-planar correction: The technique involves adjusting the first metatarsal's alignment in a frontal plane using a pin, in addition to the lateral push. Some embodiments also mention sagittal plane movement. [cite: FIG. 9 B, FIG. 10 B, FIG. 11 A-C, FIG. 14 B, FIG. 30 B]
3. Bone preparation: Cutting the ends of the first metatarsal and medial cuneiform using a tissue removing instrument, often guided by bone preparation guide cutting slots.
4. Sequential steps: Various sequences of cutting, positioning, and aligning are claimed.
5. Compression and fixation: Compressing the bones together and fixating them for fusion using bone fixation devices (e.g., screws, plates).

Hypothetical Combination of General Prior Art Elements (as known to a PHOSITA by 2015-08-14):

A PHOSITA would have been aware of the following general types of devices and techniques, as implied by the "Prior art keywords" and the patent's background description:

1. Existing Bunion Correction Surgical Techniques:
* PHOSITAs are familiar with procedures like the Lapidus procedure and basilar metatarsal osteotomies for bunion correction, which involve repositioning the first metatarsal relative to the medial cuneiform and second metatarsal. [cite: an example of such a procedure is a Lapidus procedure, An example of such a procedure is a basilar metatarsal osteotomy procedure]
* It was known that bunion deformities often present in multiple planes, including transverse (intermetatarsal angle deviation) and frontal (axial rotation). [cite: anatomical misalignment, a normal first metatarsal]
* Correction techniques often involve both translating and rotating the metatarsal. [cite: the bone is anatomically aligned in more than one plane such that the bone both translates and rotates in response to a moving force]

2. Generic Bone Positioning and Reduction Tools:
* Instruments for holding, reducing, and approximating bones (generic "bone positioning guide" or similar tools like clamps, tenaculums, or distractors) would have been known in general orthopedic surgery. Such tools often employ threaded shafts and knobs for precise, controlled movement (e.g., linear translation). [cite: bone positioning guide, the bone positioning guide includes a bone engagement member, a tip, a mechanism to urge the bone engagement member and the tip towards each other, and an actuator to actuate the mechanism]

3. Surgical Cutting Guides:
* Guides for precisely cutting bone (generic "guide" or "bone preparation guide" with cutting slots) using instruments like saw blades or burs were well-established in orthopedic surgery for osteotomies and arthrodesis (fusion) procedures. [cite: bone preparing guide, the bone preparation guide includes a body defining a first guide surface to define a first preparing plane and a second guide surface to define a second preparing plane]

4. Bone Fixation Devices:
* Various internal fixation devices (e.g., bone plates, screws, staples, intramedullary nails) were standard for stabilizing bones after repositioning and preparation for fusion. [cite: bone fixation devices]

Motivation for a PHOSITA to Combine these Elements:

A PHOSITA, faced with the known challenge of multi-planar bunion correction and tarsal-metatarsal fusion, would have strong motivation to combine and adapt these existing technologies to improve surgical outcomes and efficiency:

• Addressing Multi-planar Deformity: The recognition that bunions involve both transverse and frontal plane deformities would motivate a PHOSITA to develop a single instrument or technique capable of correcting both simultaneously or sequentially with precision. Combining a translational bone positioning mechanism (e.g., threaded shaft/knob for lateral shift and IMA reduction) with a means to achieve frontal plane rotation (e.g., using an auxiliary pin as a lever or fulcrum) within a single operative sequence would be a logical and desirable improvement over separate, less integrated approaches. The patent itself highlights the issue of "base compression" [cite: FIG. 30 B] and "unwanted spring-back" [cite: first metatarsal 210 and medial cuneiform 220] as problems in existing techniques, further motivating integrated solutions for stable, multi-planar correction.

• Integrated Positioning and Preparation: Once a precise multi-planar bone position is achieved and temporarily maintained, the next critical step for fusion is preparing the bone ends. It would be obvious to integrate the use of a bone preparation guide with precise cutting slots to make accurate cuts at the newly aligned joint surfaces. This ensures optimal bone apposition for fusion. Placing such a guide in relation to or after the bone positioning guide, and potentially using a joint spacer to define resection thickness, directly addresses the known need for accuracy in fusion procedures. [cite: a bone preparation guide can be placed over the joint spacer and engaged with the joint spacer to set a position and orientation of the bone preparation guide relative to the joint]

• Optimized Surgical Flow: The various claimed sequences of cutting and alignment (e.g., cutting the first metatarsal before or after alignment, then cutting the cuneiform) would be considered routine surgical variations for a PHOSITA. Depending on the extent of deformity, soft tissue release, or the need to minimize spring-back, a surgeon might choose to perform initial bone preparation before final alignment, or vice versa. Experimenting with such sequences to achieve the best functional outcome and reduce complications would be an obvious clinical decision, not a non-obvious inventive step in itself, when combining known tools and techniques.

Therefore, while specific prior art documents are not provided, the features claimed in US122744481, when viewed through the lens of a PHOSITA with knowledge of general bone positioning tools, multi-planar bunion correction principles, surgical cutting guides, and bone fixation techniques (all generally known by the 2015 priority date), would likely be considered obvious combinations or adaptations to solve existing problems in bunion surgery.