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Related Experiment Videos

The spring-driven implantable pump. A low-cost alternative.

B D Wigness1, F D Dorman, T D Rohde

  • 1Department of Surgery, University of Minnesota, Minneapolis 55455.

ASAIO Journal (American Society for Artificial Internal Organs : 1992)
|July 1, 1992
PubMed
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This study introduces a low-cost implantable infusion pump using an elastomeric Belleville washer. The device offers stable drug delivery over four years, proving effective for long-term parenteral treatment.

Area of Science:

  • Biomedical Engineering
  • Materials Science
  • Drug Delivery Systems

Background:

  • Increasing importance of manufacturing economics in cost-contained medicine.
  • Need for economical and reliable implantable drug delivery systems.
  • Limitations of existing precision-welded pump designs.

Purpose of the Study:

  • To develop a low-cost implantable infusion pump.
  • To utilize an elastomeric Belleville washer for spring force and reservoir functionality.
  • To assess the long-term stability and performance of the device.

Main Methods:

  • Design and fabrication of an implantable pump using formed and injection molded parts.
  • Finite element modeling of the elastomeric spring for performance prediction.

Related Experiment Videos

  • Subcutaneous implantation in a dog for a 4-year pressure monitoring study.

    • Main Results:

    • The pump utilizes an elastomeric Belleville washer, enabling low-cost manufacturing.
    • Device performance is insensitive to ambient temperature and pressure changes.
    • Subcutaneous fibrous encapsulation did not significantly alter reservoir pressure; stable pressures were observed over 4 years.

    Conclusions:

    • The developed implantable infusion pump is a simple, economical solution for prolonged parenteral drug treatment.
    • The design allows for scalable modifications without compromising spring rate uniformity.
    • The device is suitable for ambulatory subjects requiring continuous, single-rate drug infusion.