Mollie Lange, Kuya Takami Auto Suture Device for Nasal Surgery Team: Tim Pearce, Peter Ma, Mollie Lange, Kuya Takami BME 200/300 October 2006

Client: Dr. Ben Marcus Division of Otolaryngology Email: marcus@surgery.wisc.edu Advisor: Prof. Kristyn S. Masters Department of Biomedical Engineering Email: kmasters@wisc.edu

Outline Problem Statement Background Motivation Design Requirements Proposed Designs Design Matrix Future Work

Problem Statement Develop a device which will automatically deploy a suture to a specific region of the nose. Applicable to two of the most common nasal surgeries.

Background Rhinoplasty Septoplasty modify the shape and size of a nose corrects any deformation of nasal septum

Background Suture Fine threads joining two surfaces Introduced by the ancient Egyptians Stapler Caesarean sections and intestinal surgery Staples: different sizes and materials

Motivation A currently simple but tedious procedure Save both time and money Increase quality of the suture

Requirements The accuracy and reliability of the device must be comparable to the current standard procedure Surgeon and client safety must be maintained Cost per device must not exceed $300

Autosuture Varying patterns Curved or linear needle Mimic current methods used by surgeons

Pros and Cons Widely accepted by surgeons Ensure the safety of the patient Different types of suturing material – non-absorbable or absorbable Very difficult to build Not adjustable to different sizes

Medical Glue Several different types Absorption and drying time both vary Can be ordered in large quantities Gaining popularity among surgeons

Pros and Cons Success in medical studies Quick and easy to apply Long shelf life Must be coupled with nasal packing (risk of TSS) Risky to patient

Surgical Stapler Similar in function to a paper stapler Becoming commonplace in operations Non-absorbable & absorbable staples

Pros and Cons Sterile Safe Accurate Easy to modify Simpler mechanism Does not replicate current technique

Criteria (item weight) Design Matrix Criteria (item weight) Autosuture Design Medical Glue Surgical Stapler Sterilizable (3) 5x3 = 15 Patient/Surgeon Safety (3) 2x3 = 6 4x3 = 12 Accuracy (3) 3x3 = 9 Strength of Suture (2) 4x2 = 8 Adjustable device (2) 3x2 = 6 Patient Comfort (2) 5x2 = 10 Time needed (2) Cost (1) 3x1 = 3 5x1 = 5 4x1 = 4 Shelf Life (1) Attractiveness (1) Total (Max score = 100) 83 76 87

Future Work Modify existing device Some unchangeable features Size constraints Testing Obtain additional samples

References United States Patent & Trademark Office US Surgical Journal of the American Society of Medicine PubMed Online Toxic Shock Syndrome Information Service