| CPC A61M 1/80 (2021.05) [A61M 1/91 (2021.05)] | 22 Claims |

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1. A device comprising:
a housing defining a recess;
a motor assembly;
a barrel drive positioned within the housing and rotatably driven by the motor assembly about a barrel axis; wherein a cam is formed in the barrel drive;
a first follower positioned within the cam;
a second follower positioned within the cam;
a first rod coupled to the first follower;
a second rod coupled to the second follower; wherein the first rod and the second rod are at least partially positioned within the recess;
a pressure sensor;
a pressure regulator including a cavity, an air inlet, a first port in fluid communication with the cavity by a first passageway, and a second port in fluid communication with the pressure sensor by a second passageway; and
a valve in fluid communication with the cavity; wherein the valve selectively communicates the cavity with ambient air from the air inlet to adjust a pressure within the cavity.
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