Finger Joints TRIZ Cases

A curved groove and truncated cone create self-aligning linear contact in orthopedic joints, avoiding insertion damage in tight spaces.

A convex curved taper shifts point contact into a plastically deformed strip fit, securing orthopedic components without longitudinal expansion.

A jig retainer with driving rod insertion enables contact-free implant handling, precise placement, and simpler interphalangeal surgery.

Crosslinked polyisobutylene polyurethane resists oxidation and hydrolysis, improving implant toughness and long-term stability.

Complementary curved interface features keep joint implant elements aligned in rolling motion, reducing wear while preserving hinge-like movement.

A shaped, freeze-dried dermal cap restores damaged metatarsal or metacarpal cartilage surfaces to relieve pain and improve joint function.

Split mold cavities with venting and fastening enable reproducible PMMA finger joint spacers in varied sizes without pressure filling.

A lubricious, layered MTP joint implant uses anatomy-matched curvature to lower cartilage stress, preserve bone, and ease revision surgery.

A cylindrical threaded zone and a flat elastic zone improve anchoring, resist rotation and shear, and resorb after bone fusion.

A lubricious inlay implant with metatarsal-head-matched geometry preserves native bone, lowers contact stress, and improves joint mobility.

A rotatable guide and lock mechanism enables precise angular alignment of fixation members while securely stabilizing bone fasteners.

Flexible connectors and transverse fixation stabilize interphalangeal joint replacement without stems, reducing bone preparation and preserving motion.

Anchoring the thumb prosthesis to os metacarpale II bypasses the removed trapezium, preserving mobility and limiting arthritic joint strain.

A slotted hollow anchor with rounded slot edges supports stable interphalangeal arthroplasty while preserving motion and easing implantation.

Opposed magnets on each side of the metatarsophalangeal joint enable contactless motion, reducing frictional wear and implant loosening.

A cylindrical threaded zone and a flat elastic zone improve anchoring, bone fit, and resistance to shear and flexion before resorption.

A medullary fin implant secures carpometacarpal joint resurfacing while reducing bone excision and soft tissue disruption.

A larger plug opening lets the implant distract the joint while compressing graft and bone to preserve length and improve fusion.

Lubricious implant surfaces articulate with native cartilage to reduce friction, preserve bone, and maintain metatarsophalangeal joint mobility.

A saddle-shaped implant separates joint bones to reduce pain, preserve motion, and limit bone erosion without fusion.

A contoured saddle separates articulating bones to relieve pain while preserving joint stability and range of motion.

Complementary curved interfaces keep proximal and distal joint implant elements aligned through motion while limiting slipping, rubbing, and unwanted lateral movement.

Conventional thumb CMC replacements can loosen, dislocate, and increase friction; porous stems and conformal implants support fixation and anatomy.

A larger plug opening compresses graft and bone while keeping the joint distracted, helping preserve anatomical length during fusion.

Additive manufacturing combines PEEK, zeolite, and site-specific ions to customize tissue interfaces in joint and bony defect implants.

Cylindrical and flat anchoring zones adapt to bone morphology while resisting shear and flexion during resorption.

Transverse fixation and a flexible connector address bone loss and stiffness while enabling stable, natural interphalangeal motion.

A primer, broaches, and interchangeable tools streamline stem implantation, reducing surgical time and bone fracture risk.

Segmented stem and cup components with frustoconical fixation zones resolve dislocation risks while maintaining complex joint mobility.

Microgrooves on PEEK implants direct bone growth to prevent soft tissue encapsulation.

Ellipsoidal bearing surfaces replicate the dart-thrower's arc while constraining non-physiological movement to reduce wear.

An internal joint stabilizer uses bone-anchored plates and a rotating portion to secure joints without external hardware.

An internal joint stabilizer system uses a rotating portion and trajectory guide to attach securely to bone plates.

An Archimedean solid prosthesis anchors between the scaphoid and metacarpus bones using a net-like configuration with eyelets for suturing.

Liquid crystal elastomers dissipate energy and distribute stress to resolve wear life trade-offs in joint replacements.

An elastomeric hinge joint implant replaces rigid metal components to eliminate bone absorption and blood contamination while restoring natural joint movement.

A meniscus prosthetic device uses a polyurethane core and fiber-reinforced outer portion to mimic natural joint mechanics.

Compositional gradients in interpenetrating polymer networks balance mechanical strength with biocompatibility to reduce adverse tissue responses.

Partial threading reduces insertion torque and prevents migration, eliminating the need for a second surgery to remove the implant.

Segmenting the ball member allows insertion through a restricted opening, resolving the trade-off between joint stability and ease of operation.

An intra-articular stabilizer sling anchors to the thumb metacarpal to restore joint stability without sacrificing tendons or using pin fixation.

A hydrogel implant with a saddle-shaped upper surface replaces deteriorated cartilage in the carpometacarpal joint.

An arthroplastic implant with an arcuate shield prevents metacarpal bone impingement and maintains thumb length.

A one-piece prosthetic implant uses a serrated stem to anchor within bone tissue for stable positioning.

A biodegradable magnesium alloy implant with cone-shaped stems and winglet fixation aids provides high tensile strength and stability.

Segmented trapezium and metacarpal implants use downwardly extending anchoring members to prevent loosening and subsidence during thumb arthroplasty.

A modular interphalangeal prosthesis with a conical stem and snap-fitted domed head enables natural joint articulation.

Vibratory energy liquefies thermoplastic material in a joint repair device, anchoring it into bone tissue without thermal damage.

Segmented hard substance cups prevent dislocation and minimize wear debris while maintaining natural range of motion.