A fluid infusion device includes a pump having a rotor and a stator. A rotor cam element rises from a reference surface of the rotor. The stator includes a cam element having a stator cam surface. The cam elements axially displace the rotor as the rotor revolves. Inlet and outlet valves open and close as a function of angular and axial position of the rotor. A motor actuates the rotor to pump fluid to a body, via a subcutaneous conduit. First and second contact elements are located on the rotor. A sensing element on the stator cooperates with a detection circuit to detect when the sensing element makes contact with the first sensor contact element and the second sensor contact element. The detection circuit monitors a detection signal obtained from the sensing element to determine an operating condition of the fluid pump mechanism.

A fluid infusion device includes a fluid pump mechanism having a rotor and a stator. The rotor includes an optically detectable feature, a reference surface, and a cam element rising from the reference surface. The stator includes a cam element having a stator cam surface. The cam elements cooperate to axially displace the rotor as a function of angular position of the rotor, wherein the detectable feature rotates and axially translates as a function of angular position of the rotor. A biasing element provides force to urge the rotor cam element toward the stator cam element and toward the reference surface. A drive motor actuates the rotor to pump medication fluid from a fluid cartridge module to a body, via a subcutaneous conduit. An optical detection circuit interrogates the detectable feature during operation of the fluid pump mechanism to determine an operating condition of the fluid pump mechanism.

A fluid infusion device includes a fluid pump mechanism having a rotor and a stator. The rotor includes an optically detectable feature, a reference surface, and a cam element rising from the reference surface. The stator includes a cam element having a stator cam surface. The cam elements cooperate to axially displace the rotor as a function of angular position of the rotor, wherein the detectable feature rotates and axially translates as a function of angular position of the rotor. A biasing element provides force to urge the rotor cam element toward the stator cam element and toward the reference surface. A drive motor actuates the rotor to pump medication fluid from a fluid cartridge module to a body, via a subcutaneous conduit. An optical detection circuit interrogates the detectable feature during operation of the fluid pump mechanism to determine an operating condition of the fluid pump mechanism.

There is described a patch pump comprising a cartridge, a power source, a pump system, a drug delivery device and a control system configured to operate in particular the pump system and the drug delivery device. The pump system includes, on the one hand, a pump having a pump housing containing a pump piston and a valve piston and, on the other hand, a pump drive including a piston motor and a valve motor for driving the pump piston and the valve piston independently from each other through a first and a second transmission. The drug delivery device includes a transdermal delivery system having a needle actuation mechanism configured for transdermal insertion of a cannula.

The invention relates to a fluid compression apparatus having a plurality of compression stages, comprising a first compression chamber, a second compression chamber, an intake system communicating with the first compression chamber which is configured to allow fluid to be compressed into said first compression chamber, a transfer system configured to allow in an open position the transfer of fluid from the first compression chamber to the second compression chamber, a mobile piston for ensuring the compression of the fluid in the first and second compression chambers. The apparatus further comprises a discharge port which communicates with the second compression chamber and is configured to allow the exit of compressed fluid, the piston being translationally mobile in a longitudinal direction, wherein the first compression chamber is defined by a fixed lower cavity, a lower end of the piston and a first sealing system formed between the piston and a wall of the cavity, wherein the second compression chamber is defined by a fixed upper cavity, an upper end of the piston and a second sealing system formed between the piston and a wall of the upper cavity. The invention is characterized in that, in the operating configuration of the apparatus, the longitudinal direction of translation of the mobile piston is vertical, the intake system being located at a lower end of the apparatus and the discharge port being located in an upper part of the apparatus above the transfer system.

The invention relates to a fluid compression apparatus having a plurality of compression stages, comprising a first compression chamber, a second compression chamber, an intake system communicating with the first compression chamber which is configured to allow fluid to be compressed into said first compression chamber, a transfer system configured to allow in an open position the transfer of fluid from the first compression chamber to the second compression chamber, a mobile piston for ensuring the compression of the fluid in the first and second compression chambers. The apparatus further comprises a discharge port which communicates with the second compression chamber and is configured to allow the exit of compressed fluid, the piston being translationally mobile in a longitudinal direction, wherein the first compression chamber is defined by a fixed lower cavity, a lower end of the piston and a first sealing system formed between the piston and a wall of the cavity, wherein the second compression chamber is defined by a fixed upper cavity, an upper end of the piston and a second sealing system formed between the piston and a wall of the upper cavity. The invention is characterized in that, in the operating configuration of the apparatus, the longitudinal direction of translation of the mobile piston is vertical, the intake system being located at a lower end of the apparatus and the discharge port being located in an upper part of the apparatus above the transfer system.

During a pressurization stroke of a high-pressure pump, a cylinder inner wall and a plunger receive a fuel pressure from the pressurization chamber. Meanwhile, an upper housing does not receive the fuel pressure from the pressurization chamber, so that its thickness can be made thin. A cylinder is comprised of a bottom portion, a cylindrical portion and a large-diameter cylindrical portion. When inserting the large-diameter cylindrical portion into a large engaging hole, the bottom portion and the cylindrical portion are not brought into contact with a lower housing. A high liquid-tightness between the bottom portion, the cylindrical portion and a small engaging hole can be ensured.

During a pressurization stroke of a high-pressure pump, a cylinder inner wall and a plunger receive a fuel pressure from the pressurization chamber. Meanwhile, an upper housing does not receive the fuel pressure from the pressurization chamber, so that its thickness can be made thin. A cylinder is comprised of a bottom portion, a cylindrical portion and a large-diameter cylindrical portion. When inserting the large-diameter cylindrical portion into a large engaging hole, the bottom portion and the cylindrical portion are not brought into contact with a lower housing. A high liquid-tightness between the bottom portion, the cylindrical portion and a small engaging hole can be ensured.

A system, in certain embodiments, includes a compression cylinder configured to mount to a reciprocating compressor. The compression cylinder includes an intake port and a discharge port. The system also includes a piston assembly disposed within the compression cylinder. The piston assembly includes a piston, and a flow control member extending from the piston. The flow control member is configured to selectively block the intake port and the discharge port upon movement of the piston assembly relative to the compression cylinder.

A system, in certain embodiments, includes a compression cylinder configured to mount to a reciprocating compressor. The compression cylinder includes an intake port and a discharge port. The system also includes a piston assembly disposed within the compression cylinder. The piston assembly includes a piston, and a flow control member extending from the piston. The flow control member is configured to selectively block the intake port and the discharge port upon movement of the piston assembly relative to the compression cylinder.