Sensile Medical Ag

Boston Scientific Medical Device Limited

Thomas Wyss

Alexandre Perrier

Regina Marbet

Christian Huber

Fabian Bürli

Adrian Büchi

Derek Brandt

Matthias Muller

Rex Faithfull

Thomas Ajao

Stafford Guy Moss

Carol Suzanne Balfour

Pawel Klusewicz

Adrian BÜCHI

The present invention relates to methods and devices for production of injectable foams, such as those used in the treatment of varicose veins and other venous disorders. The method requires the delivery or supply of foamable liquid sclerosing agent and a suitable gas or a gas mixture to a foam producing structure in which the liquid and gas are combined to produce foam, wherein the liquid is delivered independently of the delivery of gas. Devices for producing injectable foam comprise a foam producing structure in which liquid and gas are combined to produce foam, the structure comprising an inlet for liquid and gas and an outlet for foam; a liquid pathway in communication with the inlet; and a gas pathway in communication with the inlet, characterised in that the liquid pathway comprises a means for delivering liquid through the liquid pathway independently of gas delivery through the gas pathway. In preferred embodiments, the delivery of liquid and/or gas is controlled with volumetric pumps.

Method and device for generating injectable foam

A micropump including: a stator (); a rotor () slidably and rotatably mounted at least partially in the stator, the rotor comprising a first axial extension () having a first diameter (D) and a second axial extension () having a second diameter (D) greater than the first diameter; a first valve (V) formed by a first valve seal () mounted on the stator around the first axial extension, in conjunction with a first channel () in the rotor that is configured to allow liquid communication across the first valve seal when the first valve is in an open position; a second valve (V) formed by a second valve seal () mounted on the stator around the second axial extension, in conjunction with a second channel () in the rotor that is configured to allow liquid communication across the second valve seal when the second valve is in an open position; a pump chamber () formed between the rotor and stator and between the first valve seal and second valve seal, and a cam system comprising a cam track (') on one of the rotor or stator and a cam follower (&#x2032;) on the other of the rotor or stator for axially displacing the rotor relative to the stator as a function of the rotation of the rotor, the cam track comprising a valves-closed chamber-full section (), a valves-closed chamber-empty section (), an intake section () and an expel section (). The expel section comprises an expel hold position () defining an intermediate axial position between the valves-closed chamber-full section and valves-closed chamber-empty section for partial delivery of a pump cycle volume during the expel phase.

Micropump with cam mechanism for axial displacement of rotor

A pump () comprising a stator () and a rotor () axially and rotatably movable relative to the stator, the stator comprising a rotor shaft receiving cavity (), an inlet () and an outlet () fluidly connected to the rotor shaft receiving cavity (), the rotor comprising a shaft () received in the rotor shaft receiving cavity (). The rotor shaft () comprises a cavity () receiving a piston portion () of the stator therein to form a piston chamber (), a seal () mounted between the piston portion () and inner sidewall of the cavity () to sealingly close an end of the piston chamber (). The rotor further comprises a port () fluidly connecting the piston chamber () to an outer surface () of the rotor shaft (), the port () arranged to overlap at least partially the inlet () over a rotational angle &#x3b1; of the rotor corresponding to a pump intake phase, and arranged to overlap at least partially the outlet () over a rotational angle &#x3b2; of the rotor corresponding to a pump expel phase.

Micropump

A pump including: The pump further comprises a priming actuator () mounted on a housing of the stator and movable from a locked operating position to a priming position, the priming actuator () configured to engage and axially displace the rotor from an operating position in which at least one of the first and second valves is closed, to a priming position in which both first and second valves are open.

Growing community of inventors

Zuchwil, Switzerland

Thomas Wyss