P17080: Heart Pump and Circulatory System
/public/

Integrated System Build & Test with Customer Demo

Table of Contents

Review of Action Items

Review of Action Items

Review of Action Items

Additional Accomplishments

System Updates

Circulatory System

The compliance tanks have been built and integrated into the system. The changes to the circulatory system include:

Flowmeter Location

Flowmeter Location

New Fittings

New Fittings

Drain

Drain

Overall Circulatory System

Overall Circulatory System

Resistor Measurement

The previous measurement method was manually measuring the the height. The design was changed to a turn valve because the previous pinch valve was unable to cause the flow restrictions needed to control compliance.To make it simple for the students to measure compliance the following indicator was designed. The indicator is labeled with the percent of the turn. This allows for the manual to easily describe desired locations for the students. The dial is on the turn valve so that the indicator can pass 100% to incorporate a large range of flow resistances. The protocol instructs that the students fully close the turn valve and then open it to the desired location on the indicator.

Design for Angle Measurement

Design for Angle Measurement

See CAD files here Resistor Measurement Design

Assembled Design

Assembled Design

Calculations

Compliance Calculations

Compliance Calculations

Resistance Calculations

Resistance Calculations

LabVIEW

The following LabVIEW image is the current front panel. The file is attached in the link below.
Updated LabVIEW

Updated LabVIEW

See LabVIEW update here LabView

Test Results Summary

See all Test Plans here Testplans

Frequency Calibration

It was observed that the heart rate was not the same as the input frequency. This is due to losses from the communication from the computer software to the DAQ to the solenoid. The solution to this was to do a calibration using a analog counter for accuracy. Data was collected in sets of beats per 10 seconds. The data was then multiplied by 6 to get bpm and plotted against the input frequency. The trend was linear with a strong linear regression coefficient showing that it is an acceptable fit for this data set. The linear equation was solved in the LabVIEW program so that the input value of BPM provides the needed frequency to the system to get an accurate heart beat. The counter was used again to test the program which proved to fix the problem.

Calibration Line

Calibration Line

Adapted LabVIEW Code

Adapted LabVIEW Code

Solenoid Heat Test

Solenoid heat testing was conducted this time with the solenoid inside the box with air and vacuum open. The solenoid was ran using LabVIEW for 6 hours while temperature measurements were taken. As seen by the test chart, the solenoid did not reach the maximum allowable value and followed the same trend as the initial solenoid heat testing. Thus, heat build up because of the enclosed space is not a concern.

Heat Test Setup

Heat Test Setup

Heat Test Chart

Heat Test Chart

Output Testing

Output testing is currently ongoing. Currently the pressure waveforms are accurate and are acceptable shape to model physiological conditions. The flowmeter provides data that fluctuates at time because of the mechanics of the flowmeter. The data does not allow for the integration in the LabVIEW program to generate a P-v Loop. The solution is to provide an example of using MATLAB or Excel to generate a P-v Loop. This is an exercise that the students would complete as part of the post lab.

The current pressure is outputting 120/80 as desired. This was achieved by changing the design of the original compliance tanks in MSD 1 to tanks that can hold desired pressures. As well as, replacing the pinch valve with an in-line turn valve. The turn valve assisted with achieving the desired pressure differential and the ability to change the pressure range.

Pressure Waveform

Pressure Waveform

Flowmeter Waveform

Flowmeter Waveform

Problem Tracking

The majority of problems have been solved. A new common problem of how to measure the compliance with the turn valve was found in this phase. The problem was solved by the information above under resistor measurement.

The problem of ventricle non-uniformity has not yet been solved. The pouring of the silicone is a method that takes practice. It is a trade off of how the mold is designed. Possibilities for future build would be to adapt the design of that it is similar to a casting process.

Problem Tracking

Problem Tracking

Updated problem matrix here Updated Problem Matrix

Combined Bill of Materials

See the combined bill of materials here Updated BOM

Plans for next phase

Schedule Update

Current Schedule

Current Schedule

Previous Schedule

Previous Schedule

See Schedule here Updated Schedule

Three Week Plans

Mike

Kevan

Henry

Blake

Susan

Action Items


Home | Planning & Execution | Imagine RIT

Problem Definition | Systems Design | Preliminary Detailed Design | Detailed Design

Build & Test Prep | Subsystem Build & Test | Integrated System Build & Test | Integrated System Build & Test with Customer Demo | Customer Handoff & Final Project Documentation