Blood pressure monitor with valve-chamber assembly

A valve-chamber assembly, comprising:

• a valve comprising a high pressure cavity, a low pressure cavity, a first channel providing a gas pathway between the high pressure cavity and the low pressure cavity, and a second channel providing a gas pathway between the low pressure cavity and a valve output;
• a bar lever;
• a piston located within the low pressure cavity and configured to move away from the first channel to contact and exert an upward force on the bar lever, wherein movement of the piston away from the first channel permits a flow of gas through the gas pathway between the low pressure cavity and the valve output;
• a motor configured to control a flow rate of gas through the gas pathway between the low pressure cavity and the valve output, wherein the motor includes an engagement portion;
• and
• an actuator comprising:
• a first portion engaged with the engagement portion of the motor, and
• a second portion engaged with the bar lever,
• wherein a first movement of the motor causes at least a portion of the actuator to extend towards and exert an upward force against the bar lever allowing the bar lever and the piston to move away from the first channel,
• wherein a second movement of the motor causes the at least a portion of the actuator to retract from the bar lever to reduce the upward force exerted by the actuator against the bar lever and allows the piston to move proximally to the first channel, wherein movement of the piston proximally to the first channel at least partially closes the gas pathway between the low pressure cavity and the valve output.

A blood pressure measurement system, comprising:

• an inflatable cuff configured to encompass a limb of a patient;
• a valve-chamber assembly configured to house a gas canister;
• and
• a gas pathway between the valve-chamber assembly and the inflatable cuff, wherein the valve-chamber assembly includes:
• a rod extending from a low pressure cavity to a high pressure cavity via a first channel and exerting a downward force on a channel cover to provide a gas pathway between the high pressure cavity and the first channel,
• a cap exerting a downward force on the rod,
• a first O-ring encircling a perimeter of the cap and located between the cap and a wall of the low pressure cavity, wherein the first O-ring provides a seal between the cap and the wall of the low pressure cavity,
• a base,
• a bolt fitted through an open portion of the base,
• a torque limiter located within the base and at least partially surrounding a head of the bolt,
• a second O-ring located between at least a portion of the torque limiter and the base, and
• a latch coupled to the base,
• wherein if a torque threshold is not satisfied, rotational movement of the latch in a second direction causes the bolt to rotate in the second direction and advance towards the gas canister, and
• wherein if the torque threshold is satisfied, rotational movement of the latch in the second direction causes the head of the bolt to slip through the torque limiter.