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F. G. H. K. L. M. I. A. B. C. D. E. Fault Tree Analysis Ver. 5 April 21, 2008 Team Members: Adrienne Belasco, Mitch Barnett, Urvi Patel, Dan Wilkinson Advisors: Richard Debski, PhD, Jan Grudziak, MD, PhD, Prerana Patel, MD. Failure Mode. Implementation Failure. Design Failure.

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Presentation Transcript
slide1

F

G

H

K

L

M

I

A

B

C

D

E

Fault Tree Analysis Ver. 5

April 21, 2008

Team Members: Adrienne Belasco, Mitch Barnett, Urvi Patel, Dan Wilkinson

Advisors: Richard Debski, PhD, Jan Grudziak, MD, PhD, Prerana Patel, MD

Failure Mode

Implementation Failure

Design Failure

slide2

A

The screw does not improve healing conditions for the patient

preexisting patient condition.

slide3

B

Improper fitting between screw and removal device

Machining Errors in Precision

slide4

Contamination during surgical implantation

C

The screw causes an infection

Rejection of the material

Material Biocompatibility

Patient allergy

slide5

D

Loosening of scews, decreased stability, and prolonged bone healing

Vibration and shock during bone regeneration period post-removal surgery

slide6

E

Screw shaft breaks due to high torques during removal

Bone regeneration results in higher bone-screw adhesion than normal

slide7

F

Torque generated by the surgeon is more than 10 Nm

Bone regeneration results in higher bone-screw adhesion than normal

slide8

G

Possible screw failure during bone regeneration period

Surgeon place the screw at the wrong angle, resulting in added stress

Bone regeneration results in higher bone-screw adhesion than normal

slide9

H

Reduced effectiveness of screw in the alignment of the regenerating bone

Pharmaceuticals may weaken bone

slide10

I

Overgrowth of the bone results in inability to use removal device

Natural bone regeneration

slide11

K

Screw Stripping

Bone regeneration results in higher than normal bone-screw adhesion

slide12

L

Removal device breaks due to high torques during removal

Bone regeneration results in higher bone-screw adhesion than normal

slide13

M

Screw breakage in vivo

Weakening of screw due to removal of material for second hexagonal socket