Incorporating a Pressure Sensor-Transmitter (RF) Complex on Transseptal Cannula for use with TandemHeart - PowerPoint PPT Presentation

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Incorporating a Pressure Sensor-Transmitter (RF) Complex on Transseptal Cannula for use with TandemHeart

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Title: Incorporating a Pressure Sensor-Transmitter (RF) Complex on Transseptal Cannula for use with TandemHeart


1
Incorporating a Pressure Sensor-Transmitter(RF)
Complex on Transseptal Cannula for use with
TandemHeart PTVA System Team Members Mihoko
Hashimoto Lauren Kokai Nitin
Narayana Katie OCallaghanProject Advisors
David H.J. Wang, Ph.D. Douglas E. Smith,
Ph.D. Dennis Kopilec Marlin H.
Mickle, Ph.D.December 5, 2003
University of Pittsburgh Senior Design BioE 1160
2
Overview
  • TandemHeartTM - A centrifugal pump that allows
    for fast deployment of oxygenated blood from the
    Left Atrium (LA) to the femoral artery and thus
    bypassing the Left Ventricle (LV).
  • Advantages Reduced workload on LV, possible
    healing of LV, helps maintain blood circulation
    and organ perfusion during heart surgery, bridge
    to transplant.
  • Audience Cardiologists and Cardiac Surgeons
    (maintaining blood flow), patients suffering from
    myocardial infarction or acute carditis, patients
    with deteriorating LV functionality waiting for a
    transplant, patients recuperating from heart
    surgery (increase speed of LV healing).

3
Overview
  • Problem
  • Unmonitored changes in LA pressure (below a
    certain pressure threshold) may pose a threat to
    the patient due to a potential suck down of
    tissue (overdrainage of LA). Cause tissue damage
    and reduce blood flow.
  • Solution
  • Real time pressure readings in the LA can
    possibly prevent the tissue suck down.
  • Incorporate a pressure sensor into the tip of the
    Transseptal Cannula along with the use of
    RF-technology for signal transmission.
  • Effectively determine an appropriate pump speed
    depending on patients conditions without further
    invasive processes.

4
Project Goals
  • The ultimate goal of this project is to enable
    real-time measurements of Left Atrial Pressure
    (LAP) with TandemHeart use, by placing a
    barometric absolute pressure (BAP) sensor chip
    (Kavlico sCAP1) at the tip of the cannula.
  • Incorporation of RF transmitter complex to
    transmit the real-time measurements without need
    for wiring.
  • Determine durability of the device after
    coating using simulated conditions.
  • High Level Timing Goals
  • Analysis of pressure sensor properties
    manufacturing limitations
  • Development of sensor-signal transmitter (RF?)
    complex
  • Establish that device meets PDS under simulated
    clinical use conditions
  • Verify accurate signal transmission in intended
    clinical environment

5
Future Project Opportunities
  • Successful completion of this project could be
    used for future development of a safety pump
    speed adjust feature in the pump controller.
  • By developing an algorithm to respond to low LAP
    conditions, the controller on the TandemHeartTM
    will be able to auto-adjust (a vital safety
    feature) by decreasing pump speeds.
  • The sensor-RF transmitter complex could also be
    applied for countless other internal biomedical
    devices!!

6
Features Benefits
  • Pressure sensor
  • ? provide potential for accurate real-time
    monitoring of LAP to prevent suck down of LA
  • ? allow for more accurate/sensitive pump speed
    for individual patients condition
  • (less need for highly trained system operator)
  • RF transmitter
  • ? no need for wiring

7
Group Object Tree
8
Design Sketch
Receiver
Pressure Sensor
1.2mm
RF Transmitter
1.5mm
9
Design Alternatives
  • Pressure sensor other manufacturers
  • Various sensor placements
  • Single sensor
  • Inside lumen / exterior
  • Various RF transmitter placements
  • Further away from cannula tip
  • Integrated on microchip
  • Potential need for extra transmitter outside body
  • Potential need to include amplification of signal
    in order to transmit through the chest wall
  • Pressure signal output via wire (instead of RF
    transmitter)

10
Group Function-Means Tree
11
Competitive Analysis
  • Integrated pressure sensing capabilities dont
    yet exist!
  • Existing Designs (circulatory support)
  • Centrifugal flow pumps
  • Thoratec, Arrow, MicroMedical, MedQuest, Kriton
    Medical, Terumo
  • Other forms of circulatory assistance
  • IABP (Intra-Aortic Balloon Pump)

12
Competitive Analysis
  • Strengths of our Design
  • Incorporated LAP-sensor on cannula tip
  • no need for separate LAP line
  • safety feature to prevent LA suck down
  • real-time monitoring of patient LAP
  • RF pressure signal transmission
  • no wires for signal output
  • future integration of auto safety adjust in
    controller
  • Weaknesses of our Design
  • More complicated (more potential failure modes)
  • Higher production cost

13
Technology
  • Using new technology
  • MEMS pressure sensor chip
  • RF data transmission (of pressure signal)
  • Engineering Models
  • SolidWorks design modifications
  • Simulated pressure/flow loop systems

14
Team / Resources
  • Advisors
  • Drs. David Wang Doug Smith, Dennis Kopilec
  • (CardiacAssist, Inc.)
  • ? Medical device design, cannula design, clinical
    knowledge
  • Dr. Marlin Mickle
  • (Dept. of Electrical Engineering, Univ. of
    Pittsburgh)
  • ? RF technology
  • Locations
  • Lab space for testing of design CardiacAssist,
    Univ. of Pittsburgh
  • Swanson Center design and RF systems

15
Team / Resources
  • Equipment
  • Pump system supplies and testing equipment
    CardiacAssist, Inc.
  • Pressure sensor Kavlico, Inc.
  • RF transmitter not yet identified
  • Manufacturing to be determined by CardiacAssist,
    Inc.

16
Projected Task Schedule
17
Personal Responsibilities
Project Criteria Milestone 1 (30) Milestone 2
(30) Milestone 3 (10) Milestone 4
(10) Milestone 5 (5) Milestone 6
(7.5) Milestone 7 (7.5)
18
Current Status
  • Tasks completed as of 12/5/2003
  • Group meeting with CardiacAssist
  • -Determined scope of project and documented
    specific deliverables CAI requires from students
    at conclusion of project
  • Determined Product Design Specifications
  • -Communicated project schedule and goals through
    Gantt chart, Function Means Tree, Object Tree
  • Group meeting with U of P advisor Marlin H.
    Mickle, Ph.D
  • -Students presented summary of project goals and
    relevant design information, discussed student
    needs for assistance and obtained background info
    on RF technology and circuit integration
    components, as well as anticipated difficulties
  • Order placement for Kavlico sCAP 1 BAP sensor
    chips (5)

19
Acknowledgements
  • CardiacAssist
  • Drs. Doug Smith David Wang, Dennis Kopilec
  • Project funding
  • Provision of pump system supplies testing
    equipment
  • Lab space
  • Great project opportunity!!
  • Dr. Mickle
  • RF technology expertise project guidance re
    electrical aspects
  • Lab space
  • MG
  • Project development guidance
  • FDA background info (ad nauseum)
  • Moral support!

20
Questions.?
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