Hardware

Mechanical Diagram

Schematic diagram of main mechanical components

Hardware:

• Sensors
  • Overview
  • Sensor PCB
    • Schematic
    • Bill of Materials
  • Flow sensor
  • Pressure sensors
  • Oxygen sensor

Flow actuators

• Actuator PCB/overview (link to PCB with BoM, schematic, layout, etc.)

• Proportional solenoid valve (V1) (link to doc with crit specs, driving circuit, part spec, datasheet, alternatives, etc.)

• Expiratory valve (V2) (link to doc with crit specs, driving circuit, part spec, datasheet, etc.)

Sensors

• Sensor PCB/overview (link to PCB with BoM, schematic, layout, etc.)

• Oxygen sensor (O2S) (link to doc with crit specs, interface circuit, part spec, datasheet, alternatives, etc.)

• Proximal pressure sensor (PS1)

• Expiratory pressure sensor (PS2)

• Expiratory flow sensor (FS1)

Safety Components

• 50 psi, high pressure relief valve (PRV1)

• Safety check valve (CV)

• 70 cmH2O patient-side pressure relief valve (PRV2)

• Filters (F1, F2)

• PEEP valve (PEEP) (include the design bifurcation in this module description)

Tubing and Adapters

• Manifold 1

• Manifold 2

• Mounting Bracket 1… etc.

Bill of Materials (need to think about what goes in this table, probably separate BoMs into tables by category, but here’s a sample table)

Ref	Name	Part	Description
V1	Inspiratory on/off valve	red hat process valve	completely cut off flow if required
PRV1	High pressure relief valve	Sets to 50 psi	regulates upstream pressure to 50 psi
CV	Inspiratory check valve	valve stat here	In case of emergency power loss, allows patient to continue taking breaths from air
PRV2	Maximum pressure valve	…	Sets absolute maximum pressure at patient side to 53 cm H2O
F1/F2	Filters	HEPA filters?	Keeps the system’s sensors from becoming contaminated
O2S	Oxygen sensor	Sensiron …	Checks FiO2 level
PS1/PS2	Pressure sensors	mini4v	Uses gas takeoffs to measure pressure at each desired point
FS1	Flow sensor	Sensiron flow sensor	Measures expiratory flow to calculate tidal volume
M1/M2	Manifolds	3D printed parts	Hubs to connect multiple components in one place
V3	Expiratory on/off valve	Festo Electrical Air Directional Control Valve, 3/2 flow, Normally Closed, 8 mm Push-to-Connect	Opens to initiation the expiratory cycle
PEEP	PEEP backpressure valve	PEEP valve	Sets PEEP on expiratory cycle!