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Pulsed electron avalanche knife (PEAK) for intraocular surgery
D V Palanker1, J M Miller, M F Marmor
1Department of Ophthalmology, School of Medicine, Stanford University, Stanford, California, USA. palanker@stanford.edu
Investigative Ophthalmology & Visual Science
|October 3, 2001
Summary
A novel Pulsed Electron Avalanche Knife (PEAK) uses electric fields for precise, cold cutting of intraocular tissues. This economical instrument offers a tractionless alternative for ophthalmic surgery.
Area of Science:
- Ophthalmic surgery
- Biomedical engineering
- Plasma physics
Background:
- Traditional surgical cutting methods can cause thermal damage and traction.
- A need exists for precise, economical, and non-thermal tissue dissection instruments.
Purpose of the Study:
- To develop an economical instrument for precise, tractionless, "cold" cutting in intraocular surgery.
- To investigate the use of localized electric fields for tissue dissection.
Main Methods:
- Generated micrometer-length plasma streamers using a fine wire subjected to high-voltage, nanosecond electrical pulses.
- Investigated cold cutting via explosive water evaporation induced by plasma streamers.
- Evaluated cutting effectiveness on gels, bovine eye tissues, and rabbit retina using microscopy and histology.
Main Results:
- Achieved precise, layer-by-layer cutting of gels and intraocular tissues (retina, iris, lens) without thermal damage.
- Demonstrated tissue-selective dissection by adjusting pulse energies, preserving delicate structures like retinal vessels.
- Observed plasma streamer lengths correlated with pulse energies (150-670 microJ).
Conclusions:
- The Pulsed Electron Avalanche Knife (PEAK) enables rapid, precise, tractionless cutting of intraocular tissues.
- PEAK's small probe and low cost make it suitable for retinal, cataract, and glaucoma surgery.
- Potential applications extend to intravascular and neurosurgery.
