View
115
Download
1
Tags:
Embed Size (px)
Citation preview
Swiss Army Electrocautery
Team Electrosurgery:
Sonya MakhniAmrita KarambelkarSudha Guttikonda
Vicki Lee
D-lab HealthSpring 2010
Presentation Outline
Motivation and BackgroundNicaraguan Rehabilitation Center surgeryElectrosurgery vs. electrocautery
Our DesignDesign StrategySpecificationsDemonstrationValidation
Future Work
Motivation
• Nicaraguan rehabilitation hospital used electrosurgery to cut tissue and coagulate blood during surgery
• Open circuit caused severe burns in patients as electricity found new path to ground through patient's body
• Cause of circuit failure: overuse; mishandling; normal wear and tear; voltage fluctuations
Electrosurgery vs. Electrocautery
Properties Electric current passed through patient's body
Electric current passes through metal parts,
producing heatUses Cutting tissue and sealing
blood vesselsSealing blood vessels
Issues Relies on AC power; risk of open circuit
Cutting not possible because of damage to
surrounding tissue
ElectrosurgeryDisposable Plug-in
Electrocautery
Battery-powered Electrocautery Pens with
Disposable Tips
Scalpel and Gauze
Cost
Swiss Army Electrocautery
Autoclaveable Tips
Autoclavable materials
Loss of ability to both cut
and coagulate,
but portable
All-in-one feature
Safety
Our Design
Goal: Create multi-function autoclavable electrocautery tips and encourage the use of electrocautery over electrosurgery Multi-function tip includes:
1. Antenna extension: Brass pipes of different diameter slide into one another to collapse and extend the tip from 2-5 inches; doctors can use the same tip for any depth into the body
2. Scalpel-Cautery: Dual-function; cutting and coagulating with swiveling scalpel and cauterizing tip
Design Specifications
All materials can be autoclaved (120 C, 15 psi, 20 min)Can be extended from 2 inches to 5 inchesTemperature should reach at least 1200 F to cauterize Preferably in less than 5 seconds Power must be supplied by a battery
Cost Analysis
Market PricesHigh Temp Tip: $9.40Low Temp Tip: $7.80Elongated Tip: $15
Our Design:Commercial Tip Base $7.80Brass tubing $0.84(Solder + Insulation) $0.70Scalpel $0.20
Total = $9.54
Design Parameters
Portable
Cost-effective
Safe
Multi-functional
Impact on Global Health
More patients can be helped
Reduces risk to patients
Faulty electrosurgery machinery causes delays in surgery
Reduces overall cost
Transition to electrocautery:Facilitated by ease-of-use andsafety of new tip
Preliminary Tests
Control (Bovie) tip glowed red with 2.8 A at 1.5 V after 2 sec
Our tip glowed red with 2.8 A at 1.5 V after 2 sec
Control Our Design
Preliminary Tests
• Conducted heating tests on scalpel
• Became warm after 30 sec at 3.6 A and 0.5 V
• Possible cause: heat capacity of stainless steel too high; large surface area dissipates too much heat
•Possible solutions
-Reduce surface area of blade
-Use alternative autoclavable materials such as copper coated with chrome/gold , silicon
Test the tip in an autoclave
Measure the exact temperature of the tip
Test the lifespan of a tip:Corrosion of tip and possible coatingBattery life
More user-friendly to switch cut/coagulate modes
Test different materials:Cheaper, requiring less energy, non-stick, etc.
Other tip designs:Heated scalpel tipBendable tipEvacuate fumes
Future Tests
– 510K
– Predicate Devices:• Standard Bovie Tips
– Manufacturing:• Local Assembly
Regulatory Pathway
Jose, Anna, Nathan, Ryan, Amit, TedDennisBernardAilisVarshaGary GogolinProfessor Kimerling
Acknowledgements