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Design for Benchtop Point of Care Device

Point of care devices are mainly needed in locations where AC power may not be readily accessible therefore, the design will rely on (direct current) DC power. Our device will deliver a fully autonomous solution that will be controlled by an onboard controller and driven by a 12VDC motor with a max rpm of 1100 rpm. The motor speed will be monitored by an in-line encoder, this will allow the system to monitor and regulate speed of the motor. For testing purposes the device will require a heat source that will require a constant temperature of 60 degrees Celsius +/- 5 degrees Celsius for 20 minutes. The heat source will be an optical heating based source. A temperature sensor will be utilized to monitor and ensure compliance with temperature variation. As shown below in Figure 1, our benchtop device will assist in the diagnosis of disease based off of a chemical reaction that occurs in the disk detector chamber, an ultraviolet light source will be required for detection of chemical microfluidic reactions in the detection chamber. The casing of the device should have the durability to withstand any extreme weather condition.

Proposed approach for analysis, testing and design validation - Ming

For heating element validation, we will test the element in its working condition and verify that it meets our specifications. Once the device is turned on, the heating element will start to heat up the disk until the temperature of the disk reaches 60 degrees Celsius. During our validation testing, we will ensure that the heater can achieve and maintain this temperature, plus or minus five degrees, for 60 minutes or three times longer than its regular use. If the temperature fluctuates more than five degrees, the test will be stopped until all system parts cool down to room temperature, and we can adjust the heater for another trial. We will repeat this processes of calibrating the heater to our specifications until the device can maintain 60 degrees Celsius, plus or minus five degrees, for 60 minutes; if this is not attainable, we will look into a different heating element.

For the validation of the motors rotational speed to ensure that it remains consistent after multiple uses, we will cycle the motor prior to installation. First, we will verify the correlation between the RPM of the motor and the VDC input to the motor. This test will allow us to ensure that by changing the weight or size of the test disk, we maintain our programmed RPM. To verify that our onboard controller is providing the correct RPM output, we can run a second test utilizing a strobe. Matching the RPM’s of both tests will confirm that our controller and motor are working correctly. After validated, we will then run the motor at full speed for two hours and monitor the RPM and VDC input. The speed intervals used by the motor will be dependent on the configuration of the test disks; therefore, we need to test a variety of disks, including those of different weights and materials to ensure that the RPM remains consistent. When we find that the RPM can keep constant with a variety of disk types, we will deem our validation test successful.

Revisions：

Temp - ASTM  Strobe light astm to verify speed look into light standard to read lumens these standard will go with our mockup test to make sure we are testing what we say we are testing

The strobe light will be tachmeter