Release mechanism utilizing shape memory polymer material

Lee, Abraham P; Northrup, M Allen; Ciarlo, Dino R; Krulevitch, Peter A; Benett, William J

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Title: Release mechanism utilizing shape memory polymer material

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Abstract

Microfabricated therapeutic actuators are fabricated using a shape memory polymer (SMP), a polyurethane-based material that undergoes a phase transformation at a specified temperature (Tg). At a temperature above temperature Tg material is soft and can be easily reshaped into another configuration. As the temperature is lowered below temperature Tg the new shape is fixed and locked in as long as the material stays below temperature Tg. Upon reheating the material to a temperature above Tg, the material will return to its original shape. By the use of such SMP material, SMP microtubing can be used as a release actuator for the delivery of embolic coils through catheters into aneurysms, for example. The microtubing can be manufactured in various sizes and the phase change temperature Tg is determinate for an intended temperature target and intended use.

Inventors:

Lee, Abraham P ^[1]; Northrup, M Allen ^[2]; Ciarlo, Dino R ^[3]; Krulevitch, Peter A ^[4]; Benett, William J ^[3]

Walnut Creek, CA
Berkeley, CA
Livermore, CA
Pleasanton, CA

Issue Date:: 2000-01-01

Research Org.:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

OSTI Identifier:: 873152

Patent Number(s):: 6102933

Assignee:: Regents of University of California (Oakland, CA)

Patent Classifications (CPCs):: A - HUMAN NECESSITIES A61 - MEDICAL OR VETERINARY SCIENCE A61B - DIAGNOSIS

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A - HUMAN NECESSITIES A61 - MEDICAL OR VETERINARY SCIENCE A61B - DIAGNOSIS
A61B17/12022 - {Occluding by internal devices, e.g. balloons or releasable wires
A61B17/1214 - {Coils or wires}
A61B2017/00867 - {shape memory effect
A61B2017/00871 - {polymeric}
A61B2017/12068 - {detachable by heat}
A61B2017/12077 - {Joint changing shape upon application of heat, e.g. bi-metal or reversible thermal memory}

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DOE Contract Number:: W-7405-ENG-48

Resource Type:: Patent

Country of Publication:: United States

Language:: English

Subject:: release; mechanism; utilizing; shape; memory; polymer; material; microfabricated; therapeutic; actuators; fabricated; smp; polyurethane-based; undergoes; phase; transformation; specified; temperature; tg; soft; easily; reshaped; configuration; lowered; below; fixed; locked; stays; reheating; return; original; microtubing; actuator; delivery; embolic; coils; catheters; aneurysms; example; manufactured; various; sizes; change; determinate; intended; target; release mechanism; various sizes; below temperature; phase transformation; original shape; microfabricated therapeutic; smp microtubing; therapeutic actuators; temperature tg; phase change; shape memory; specified temperature; memory polymer; polymer material; release actuator; tg material; temperature target; stays below; polyurethane-based material; change temperature; smp material; embolic coils; mechanism utilizing; embolic coil; lowered below; material stays; easily reshaped; intended temperature; therapeutic actuator; /606/

Citation Formats


                    Lee, Abraham P, Northrup, M Allen, Ciarlo, Dino R, Krulevitch, Peter A, and Benett, William J. Release mechanism utilizing shape memory polymer material.  United States: N. p., 2000. 
        Web.

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                    Lee, Abraham P, Northrup, M Allen, Ciarlo, Dino R, Krulevitch, Peter A, & Benett, William J. Release mechanism utilizing shape memory polymer material.  United States.

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                    Lee, Abraham P, Northrup, M Allen, Ciarlo, Dino R, Krulevitch, Peter A, and Benett, William J. Sat .  
        "Release mechanism utilizing shape memory polymer material".  United States.  https://www.osti.gov/servlets/purl/873152.

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@article{osti_873152,

  title        = {Release mechanism utilizing shape memory polymer material},

  author       = {Lee, Abraham P and Northrup, M Allen and Ciarlo, Dino R and Krulevitch, Peter A and Benett, William J},

  abstractNote = {Microfabricated therapeutic actuators are fabricated using a shape memory polymer (SMP), a polyurethane-based material that undergoes a phase transformation at a specified temperature (Tg). At a temperature above temperature Tg material is soft and can be easily reshaped into another configuration. As the temperature is lowered below temperature Tg the new shape is fixed and locked in as long as the material stays below temperature Tg. Upon reheating the material to a temperature above Tg, the material will return to its original shape. By the use of such SMP material, SMP microtubing can be used as a release actuator for the delivery of embolic coils through catheters into aneurysms, for example. The microtubing can be manufactured in various sizes and the phase change temperature Tg is determinate for an intended temperature target and intended use.},

  doi          = {},

  journal      = {},
number       = ,

  volume       = ,

  place        = {United States},

  year         = {2000},

  month        = {1}

}

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