# US 9,907,891 B2 · Pump or rotary cutter for operation in a fluid > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,907,891 B2 - Document ID: US9907891B2 - Status: Granted - Kind: B2 - Application number: 14/942,158 - Filed: 2015-11-16 - Published: 2016-05-26 - Granted: 2018-03-06 - Earliest claimed: 2010-03-05 - Assignees: Ecp Entwicklungsgesellschaft Mbh - Applicants: Ecp Entwicklungsgesellschaft Mbh - Inventors: Petra Wiessler; Sven-Rene Friedel; Reiner Liebing; Sami Er; Henning Schlicht - Web page: https://patentgrep.com/patent/US9907891B2 ## CPC - A61B 17/320725: {with radially expandable cutting or abrading elements (A61B17/32075 takes precedence)} - A61B 17/320758: {with a rotating cutting instrument, e.g. motor driven (A61B17/320725, A61B17/32075 and A61B17/320783 take precedence; for removing intra-ocular material A61F9/00763; endoscopic rotatable cutting instruments A61B17/32002)} - A61M 60/178: drawing blood from a ventricle and returning the blood to the arterial system via a cannula external to the ventricle, e.g. left or right ventricular assist devices - A61M 60/216: including a rotating member acting on the blood, e.g. impeller - A61M 60/462: Electromagnetic force - F04D 3/00: Axial-flow pumps (priming or boosting F04D9/00) - F04D 29/24: Vanes - F04D 29/247: {elastic or self-adjusting} - A61M 60/135: inside a blood vessel, e.g. using grafting - A61M 60/148: in line with a blood vessel using resection or like techniques, e.g. permanent endovascular heart assist devices - A61M 60/414: transmitted by a rotating cable, e.g. for blood pumps mounted on a catheter - A61M 2205/0277: Chemo-active materials - A61M 2205/0288: Electro-rheological or magneto-rheological materials - A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D) - 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)} - F04D: NON-POSITIVE-DISPLACEMENT PUMPS (engine fuel-injection pumps F02M; ion pumps H01J41/12; electrodynamic pumps H02K44/02) ## Abstract The invention relates to a fluid pump or rotary cutter having at least one first element (9′″, 10′″) which can be brought from a transport state into an operating state by changing at least one mechanical property. Such a pump can, for example, be a blood pump for the medical, microinvasive area. The object of achieving a transition between the transport state and the operating state which is as comfortable as possible and in so doing leaving a freedom in the design of corresponding apparatus, in particular of a pump, which is as large as possible, is achieved using the means of the invention in that the first element at least partly comprises a material (24, 25, 26, 27) or can be filled with a material or material mixture which passes through a chemical reaction, in particular cross-linking, or a crystallization for transition into the operating state. ## Claims ### Claim 1 A pump for operation in a fluid, the pump comprising: at least one first element, the first element having a first transport state and a second operating state, wherein in the first transport state the first element is compressed to a first size, and wherein in the second operating state the first element is expanded to a second size, the second size being larger than the first size; and a material or material mixture, wherein the material is configured to pass through a transition from a first rheological state to a second rheological state, and wherein the at least one first element at least partly comprises the material or material mixture; wherein when the first element is in the first transport state, the material is in the first rheological state, and when the first element is in the second operating state, the material is in the second rheological state. ### Claim 2 (depends on 1) The pump of claim 1, wherein the first element is a part of a rotor of a conveying element. ### Claim 3 (depends on 2) The pump of claim 2, wherein the first element is a conveying blade of a pump. ### Claim 4 (depends on 1) The pump of claim 1, wherein the first element is a pump housing. ### Claim 5 (depends on 1) The pump of claim 1, wherein the changeable mechanical property is the stiffness and/or the geometrical form. ### Claim 6 (depends on 1) The pump of claim 1, wherein the material or material mixture of the first element comprises a hardenable material or material mixture. ### Claim 7 (depends on 6) The pump of claim 6, wherein the hardenable material or material mixture can be hardened by temperature effect, electric and/or magnetic fields, radiation, mechanical effect or by initializing a crystallization. ### Claim 8 (depends on 7) The pump of claim 7, wherein the material can be hardened by the addition of a further material that is included in the medium on which the apparatus has an effect, or by contact with a further material. ### Claim 9 (depends on 1) The pump of claim 1, wherein the first element can be changed by a continued or further reaction, reversibly or irreversibly, into a state in which the apparatus can be transported or in which it can be brought into a transport state by mechanical destruction. ### Claim 10 (depends on 1) The pump in accordance with claim 1, wherein the first element at least partly comprises the material or can be filled with the material or material mixture which, as long as it is exposed to a radiation, an electric field and/or a magnetic field, has mechanical properties changed with respect to the state without such effect, in particular changed stiffness/viscosity or shape. ### Claim 11 (depends on 1) The pump of claim 1, wherein the material or material mixture has a lower viscosity in a transport state of the first element. ### Claim 12 (depends on 11) The pump of claim 11, wherein the viscosity of the material or material mixture allows the first element to be compressed. ### Claim 13 (depends on 1) The pump of claim 1, wherein the material or material mixture passes through a transition from a first rheological state to a second rheological state due to cross-linking. ### Claim 14 A method for operating a pump; the method comprising: inserting a percutaneous blood pump into patient's body, the blood pump including a first element configured to be filled with a material or material mixture which passes through a transition from a first rheological state into a second rheological state; transitioning the first element from a first transport state to a second operational state; providing power to rotate a rotor of the pump; wherein the material/material mixture of the first element undergoes a reaction, in particular crosslinking, or a crystallization after introduction into the patient's body before operation or directly on being provided power, wherein when the first element is in the first transport state, the material is in the first rheological state, and when the first element is in the second operating state, the material is in the second rheological state. ### Claim 15 (depends on 14) The method of claim 14, the method further comprising introducing the material into at least one hollow space of the first element before the reaction or crystallization. ### Claim 16 (depends on 15) The method of claim 15, the method further comprising applying a stimuli to the pump to initiate, assist or carry out the reaction or crystallization, wherein the stimuli is one of radiation, temperature change or mechanical effect, or electric or magnetic fields. ### Claim 17 (depends on 16) The method of claim 16, wherein the pump is exposed to the stimuli after its introduction into the patient's body and power is provided to the pump during the application of the stimuli; or in that the pump is exposed to stimuli during transport.