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UW-Madison BME 300 - Implant-Retained Finger Prosthesis

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Implant-Retained Finger ProsthesisOverViewProblem StatementBackground – Prosthetic fingerBackground – Implant-retainedBackground – OsseointegrationSummary of Project Design Specification (PDS)FunctionRequirementsPhysical and Operational CharacteristicsProduction Characteristics and MiscellaneousDesign AlternativesConnection DSN AlternativesSlide 14Slide 15Slide 16Slide 17Slide 18Slide 19Slide 20Slide 21Connection DSN Alternatives MatrixSubstructure DSN AlternativesSlide 24Slide 25Slide 26Slide 27Slide 28Slide 29Slide 30Slide 31Substructure DSN Alternatives MatrixFuture PlansQuestions???Client: Greg GionAdvisor: Professor TompkinsDustin Gardner Team LeaderKaren Chen CommunicatorAllison McArton BWIGRichard Bamberg BSACAlex Kracht CommunicatorImplant-Retained Finger ProsthesisImplant-Retained Finger ProsthesisOctober 19, 2007OverViewOverView•Background•Problem Statement•Project Design Specification•Design Alternatives•Future WorkProblem StatementProblem Statement•Design durable and functional prosthesis substructure•Design removable and force-resistant connecting mechanism•Currently in US only slip-cover used•New international approaches include bone implants•Implants in distal terminal digit bone•Prosthesis aids increased mobility and useBackground – Prosthetic fingerBackground – Prosthetic finger•Silicone elastomer, polysiloxane, slips over the amputation•Medical adhesion, vacuum•Cosmetics•Less functionalityBackground – Implant-retainedBackground – Implant-retained•In Europe, UK, Austrailia, South Africa•Osseointegration abutment•Anchor solid element & polysiloxane to abutment•Functionality, regain confidenceBackground – OsseointegrationBackground – Osseointegration•Titanium implant in rabbit bone•Dentistry fixation, maxillofacial reconstruction•Two surgeries•Implant abutment into skeleton, wound healing•Re-expose abutment, attach prosthesis•3~6 month rehabilitationSummary of Project Design Specification (PDS)Summary of Project Design Specification (PDS)•Function•Client Requirements•Design Requirements•Physical and Operational Characteristics•Production Characteristics•MiscellaneousFunctionFunction•A substructure and connecting mechanism•Only one method currently in the U.S•Other countries are more advanced•Increase motility and usageRequirementsRequirements•Client Requirements•New or improved attachment or substructure•Final computer simulation•Keep within budget•Design Requirements•Better functionality and durability of prosthesisPhysical and Operational CharacteristicsPhysical and Operational Characteristics•Performance Requirements•Safety•Accuracy, reliability, and life in service•Operating environment•Ergonomics, size, and weight•Materials and AestheticsProduction Characteristics and MiscellaneousProduction Characteristics and Miscellaneous•Quantity•Target Product Cost•Standards and Specifications•Customer•Patient-related Concerns•CompetitionDesign AlternativesDesign Alternatives•Terminal Bone Attachment Mechanisms•Finger Prosthesis Substructure MechanismsPart I:Part II:Connection DSN AlternativesConnection DSN Alternatives•Screw and Clip (DSN #1)•Magnet and Clip (DSN #2)•Allen Wrench (DSN #3)•Reverse Screw Clip (DSN #4)How it works…•Spring loaded shaft in terminal end•Screw prosthesis into threaded well•Align clip segments with clip wells•Push clips inwards and prosthesis downwards•Finger prosthesis locks in position(DSN#1)- Screw n’ Clip Screw n’ Clip(DSN#1)- Screw n’ Clip Screw n’ ClipPros•Provides a smooth, tight fit•Structurally sound and stable•Resists external shear and normal forcesCons•Hard to install shaft•Difficult to remove mechanism•Complicated construction(DSN#1)- Pros & Cons Pros & Cons(DSN#1)- Pros & Cons Pros & ConsHow it works…•Align clips, wells and magnetic poles•Push clips inwards, insert into wells•Attach magnets together and release clips•Release clips simultaneously to lock position(DSN#2)- Magnet and Clip Magnet and Clip(DSN#2)- Magnet and Clip Magnet and ClipPros•Easy to install and remove•Simple construction•Provides a smooth fitCons•Lower resistance to shear, normal forces•Easy to fall of•Not structurally stable(DSN#2)- Pros & Cons Pros & Cons(DSN#2)- Pros & Cons Pros & ConsHow it works…•Insert terminal shaft in prosthesis shaft•Position shafts such that slots aligned•Fully insert shaft until locked position•Insert Allen wrench screw through slots•Tighten screw until firm fit achieved(DSN#3)- Allen Wrench Allen Wrench(DSN#3)- Allen Wrench Allen WrenchPros•Provides a solid, tight fit•Relatively easy to remove•Resists external shear and normal forcesCons•Non-uniform structure, not aesthetically pleasing•Difficult to remove mechanism•Complicated construction(DSN#3)- Pros & Cons Pros & Cons(DSN#3)- Pros & Cons Pros & ConsHow it works…•Depress buttons on prosthesis•Slide prosthesis structure over terminal end•Align bottom slots with pins•Click pins into place, release buttons(DSN#4)- Reverse Screw n’ Clip Reverse Screw n’ Clip(DSN#4)- Reverse Screw n’ Clip Reverse Screw n’ ClipPros•Provides a smooth, tight fit•Easy to remove mechanism•Resists external shear and normal forcesCons•Hard to install terminal end mechanism•Not structurally stable (top heavy)•Very complicated construction(DSN#4)- Pros & Cons Pros & Cons(DSN#4)- Pros & Cons Pros & ConsFunctionality (30pts)Durability (25pts)Cost Effectiveness(10pts)Feasibility(35pts)Total (100pts)Screw and Clip Mechanism24 20.5 7.2 28 79.7Magnet and Clip Mechanism15.6 13 7.2 25.2 61Allen Wrench Mechanism24 22 8.2 30.8 85Reverse Screw Clip Mechanism22.8 17 6 21 66.8Connection DSN Alternatives MatrixConnection DSN Alternatives MatrixSubstructure DSN AlternativesSubstructure DSN Alternatives•Spring-loaded Sac (DSN #5)•Mech. Joint w/ Spring (DSN #6)•Flat Piece (DSN #7)•Articulation Mech. (DSN #8)How it works…•Elastic fibers hold joint in place•Each fiber resists one direction of movement•A spring maintains relaxed position(DSN#5)- Spring-Loaded Sac Spring-Loaded Sac(DSN#5)- Spring-Loaded Sac Spring-Loaded SacPros•Allows prosthetic to move naturally•Finger can bend while keeping some tensionCons•Less feasible to create•Could tear if enough force applied•Can’t produce much gripping force(DSN#5)- Pros & Cons Pros & Cons(DSN#5)- Pros & Cons Pros &


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UW-Madison BME 300 - Implant-Retained Finger Prosthesis

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