Release mechanism utilizing shape memory polymer material

Title: Release mechanism utilizing shape memory polymer material

Full Record
Other Related Research

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 Lab. (LLNL), Livermore, CA (United States)

OSTI Identifier:: 873152

Patent Number(s):: 6102933

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

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.

Copy to clipboard


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

Copy to clipboard


                    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.

Copy to clipboard


                    
@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}

}

Copy to clipboard

Patent:

View Patent

Save / Share:

Export Metadata

Save to My Library

Similar records in DOE Patents and OSTI.GOV collections:

Shape memory polymer (SMP) gripper with a release sensing system

Patent Maitland, Duncan J. ; Lee, Abraham P. ; Schumann, Daniel L. ; ...

A system for releasing a target material, such as an embolic coil from an SMP located at the end of a catheter utilizing an optical arrangement for releasing the material. The system includes a laser, laser driver, display panel, photodetector, fiber optics coupler, fiber optics and connectors, a catheter, and an SMP-based gripper, and includes a release sensing and feedback arrangement. The SMP-based gripper is heated via laser light through an optic fiber causing the gripper to release a target material (e.g., embolic coil for therapeutic treatment of aneurysms). Various embodiments are provided for coupling the laser light into themore »« less
Full Text Available
Shape memory alloy/shape memory polymer tools

Patent Seward, Kirk P. ; Krulevitch, Peter A.

Micro-electromechanical tools for minimally invasive techniques including microsurgery. These tools utilize composite shape memory alloy (SMA), shape memory polymer (SMP) and combinations of SMA and SMP to produce catheter distal tips, actuators, etc., which are bistable. Applications for these structures include: 1) a method for reversible fine positioning of a catheter tip, 2) a method for reversible fine positioning of tools or therapeutic catheters by a guide catheter, 3) a method for bending articulation through the body's vasculature, 4) methods for controlled stent delivery, deployment, and repositioning, and 5) catheters with variable modulus, with vibration mode, with inchworm capability, andmore »« less
Full Text Available
Multi-range force sensors utilizing shape memory alloys

Patent Varma, Venugopal K.

The present invention provides a multi-range force sensor comprising a load cell made of a shape memory alloy, a strain sensing system, a temperature modulating system, and a temperature monitoring system. The ability of the force sensor to measure contact forces in multiple ranges is effected by the change in temperature of the shape memory alloy. The heating and cooling system functions to place the shape memory alloy of the load cell in either a low temperature, low strength phase for measuring small contact forces, or a high temperature, high strength phase for measuring large contact forces. Once the loadmore »« less
Full Text Available
Micro devices using shape memory polymer patches for mated connections

Patent Lee, Abraham P. ; Fitch, Joseph P.

A method and micro device for repositioning or retrieving miniature devices located in inaccessible areas, such as medical devices (e.g., stents, embolic coils, etc.) located in a blood vessel. The micro repositioning or retrieving device and method uses shape memory polymer (SMP) patches formed into mating geometries (e.g., a hoop and a hook) for re-attachment of the deposited medical device to a catheter or guidewire. For example, SMP or other material hoops are formed on the medical device to be deposited in a blood vessel, and SMP hooks are formed on the micro device attached to a guidewire, whereby themore »« less
Full Text Available
Method for loading shape memory polymer gripper mechanisms

Patent Lee, Abraham P. ; Benett, William J. ; Schumann, Daniel L. ; ...

A method and apparatus for loading deposit material, such as an embolic coil, into a shape memory polymer (SMP) gripping/release mechanism. The apparatus enables the application of uniform pressure to secure a grip by the SMP mechanism on the deposit material via differential pressure between, for example, vacuum within the SMP mechanism and hydrostatic water pressure on the exterior of the SMP mechanism. The SMP tubing material of the mechanism is heated to above the glass transformation temperature (Tg) while reshaping, and subsequently cooled to below Tg to freeze the shape. The heating and/or cooling may, for example, be providedmore »« less
Full Text Available

Similar Records