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A compact cryosurgical apparatus for minimally invasive procedures
Y Rabin1, T B Julian, N Wolmark
1Department of Human Oncology, Allegheny University of the Health Sciences, Pittsburgh, Pennsylvania, USA.
Biomedical Instrumentation & Technology
|May 1, 1997
Summary
A novel liquid nitrogen cryosurgery apparatus offers precise tumor treatment with minimal tissue damage. This minimally invasive cryoprobe system enhances safety and reduces coolant use for effective cryosurgical operations.
Area of Science:
- Medical Devices
- Surgical Technology
- Oncology
Background:
- Minimally invasive cryosurgery is an evolving cancer treatment modality.
- Existing cryosurgical devices face challenges in precision and efficiency.
Purpose of the Study:
- To introduce a new liquid-nitrogen-based apparatus for minimally invasive cryosurgery.
- To evaluate the performance and efficiency of the novel cryoprobe system.
Main Methods:
- Design and assembly of a cryoprobe with a cryoneedle, thermal insulation shell, and protective tube.
- Development of a separated liquid nitrogen supply system to minimize heat loss.
- Evaluation in gelatin solutions and porcine tissues (muscle, liver).
Main Results:
- The apparatus allows accurate cryoprobe tip localization and minimal surrounding tissue destruction.
- Reduced coolant consumption and safe low-pressure operation were achieved.
- In-vivo results in porcine liver and muscle matched gelatin model predictions.
- A three-cryoprobe configuration created a 50 mm diameter, 75 mm length frozen region in 11 minutes with 43% thermal efficiency.
Conclusions:
- The new apparatus is effective for minimally invasive cryosurgery, particularly for breast tumors.
- Its design enhances precision, reduces tissue damage, and improves thermal efficiency.
- The system's small size and efficient design make it suitable for clinical cryosurgical applications.