# US 2025/0367367 A1 · Pump drive for a medicament delivery device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2025/0367367 A1 - Document ID: US20250367367A1 - Status: Published application - Kind: A1 - Application number: 18/874,135 - Filed: 2023-05-31 - Published: 2025-12-04 - Earliest claimed: 2022-06-14 - Assignees: Shl Medical AG - Applicants: SHL Medical AG - Inventors: Christoph Egloff; Paolo Ravaynia; Hsuan Wang; Plamen Balkandjiev; Stephen Allison Porter; Mariano Mumpower; Mason Watts - Web page: https://patentgrep.com/patent/US20250367367A1 ## CPC - A61M 5/14216: {Reciprocating piston type} - A61M 5/14224: {Diaphragm type} - A61M 5/16809: {by repeated filling and emptying of an intermediate volume} - A61M 5/172: electrical or electronic - A61M 2205/0266: Shape memory materials - A61M 2205/3368: Temperature - A61M: DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY (introducing media into or onto the bodies of animals A61D7/00; means for inserting tampons A61F13/26; devices for administering food or medicines orally A61J; containers for collecting, storing or administering blood or medical fluids A61J1/05); DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY (surgery A61B; chemical aspects of surgical articles A61L); DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR {(Electrotherapy, e.g. producing anaesthesia by the use of alternating or intermittent currents A61N1/36021)} ## Abstract The present disclosure provides a pump drive for a medicament delivery device. The pump drive comprises a pumping arrangement for conveying a medicament along a fluid path as part of a medicament delivery process. The pump drive further comprises a shape memory element configured to change shape according to a temperature thereof, wherein the shape memory element is operatively coupled to the pumping arrangement such that a change of shape of the shape memory element causes the pumping arrangement to convey the medicament along the fluid path. The pump drive further comprises a temperature control arrangement configured to change the temperature of the shape memory element and thereby change the shape of the shape memory element. ## Claims ### Claim at position 1 1-15 (canceled) ### Claim 16 A pump drive for a medicament delivery device, comprising: a pumping arrangement for conveying a medicament along a fluid path as part of a medicament delivery process; a shape memory element configured to change shape according to a temperature thereof, wherein the shape memory element is operatively coupled to the pumping arrangement such that a change of shape of the shape memory element causes the pumping arrangement to convey the medicament along the fluid path; and a temperature control arrangement configured to change the temperature of the shape memory element and thereby change the shape of the shape memory element. ### Claim 17 (depends on 16) The pump drive according to claim 16, wherein: the change of shape of the shape memory element causes a pumping element of the pumping arrangement to move from a first state to a second state and/or from the second state to the first state. ### Claim 18 (depends on 17) The pump drive according to claim 17, wherein: the pumping arrangement comprises a pumping chamber coupled to an inlet; and a first motion of the pumping element from the first state to the second state conveys the medicament into the pumping chamber via the inlet. ### Claim 19 (depends on 17) The pump drive according to claim 17, wherein: the pumping arrangement comprises a pumping chamber coupled to an outlet; and a second motion of the pumping element from the second state to the first state conveys the medicament out of the pumping chamber via the outlet. ### Claim 20 (depends on 19) The pump drive according to claim 19, wherein: the pumping chamber is coupled to the inlet and/or the outlet via one-way valves or electronically controlled valves. ### Claim 21 (depends on 16) The pump drive according to claim 16, wherein: the temperate control arrangement is configured to repeatedly change the shape of the shape memory element between a first shape and a second shape; and repeatedly changing the shape of the shape memory element between the first shape and the second shape causes a reciprocal motion of a pumping element of the pump arrangement. ### Claim 22 (depends on 17) The pump drive according to claim 17, wherein: the pumping element comprises a plunger or a membrane. ### Claim 23 (depends on 17) The pump drive according to claim 17, wherein: the pumping arrangement comprises a biasing element biasing the pumping element into the first state such that a motion of the pumping element from the first state to the second state biases the pumping element against the biasing element. ### Claim 24 (depends on 16) The pump drive according to claim 16, wherein: the shape memory element is electrically conductive; and the temperature control arrangement comprises one or more electrical contacts configured to pass an electrical current through the shape memory element to thereby change the temperature of the shape memory element. ### Claim 25 (depends on 16) The pump drive according to claim 16, wherein: a change of shape of the shape memory element causes the temperature control arrangement to be decoupled from the shape memory element; and the decoupling of the temperature control arrangement from the shape memory element causes the shape memory element to change shape and thereby recouple the temperature control arrangement to the shape memory element. ### Claim 26 (depends on 16) The pump drive according to claim 16, wherein: the shape memory element is formed as a wire. ### Claim 27 (depends on 26) The pump drive according to claim 26, wherein: the change of shape of the shape memory element comprises a change of length of the wire. ### Claim 28 (depends on 16) The pump drive according to claim 16, wherein: wherein the shape memory element comprises nitinol. ### Claim 29 (depends on 16) A medicament delivery device comprising the pump drive according to claim 16. ### Claim 30 (depends on 16) A method of operating the pump drive according to claim 16, comprising: changing, using the temperature control arrangement, the temperature of the shape memory element to thereby cause the shape memory element to change shape and thereby cause the pumping arrangement to pump the medicament along the fluid path.