Patent US2897820A successfully refreshed from Google Patents.
US3750670A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Laser cauterizer
Assignee: Medoptics Inc
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Filing: 1970-08-03
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Granted: 1973-08-07
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Expires: 1990-08-03
Abstract
Abstract A laser with a light frequency transducer (typically of the frequency doubler type) within a lser cavity. The cavity is mirrored to reflect light at the lased frequency and to transmit light from the cavity at the transduced frequency. The laser is provided with a convex lens at its end adjacent the frequency transducer. Likewise, the cavity mirror adjacent the frequency transducer is provided with a concave reflecting surface. The convex lens in cooperation with the concave cavity mirror provides a necessary light pupil through the light frequency transducer for efficient frequency change and a collimated light path through the laser for efficient light emission. When utilized with a YAG laser and a silicon filter disposable into and out of the optic axis of the laser, a barium-sodium-niobate light frequency transducer can be heat tuned to provide a 6,600 angstrom lasing mode useful for repair of retinal detachment and a 5,320 angstrom mode useful for treating the retinal blood vessels of diabetics.
Inventors
- 👤 P Palanos
- 👤 F Unterleitner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 01:07
CPC Classifications
A; A61; A61F; A61F9/00; A61F9/007; A61F9/008; A61F9/00821; A61F9/00823; H; H01; H01S; H01S3/00; H01S3/10; H01S3/106; H01S3/108; H01S3/109; A61F2009/00861; A61F2009/00863
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
37 words
The combination of claim 1 and wherein said one of said reflecting means is adapted to reflect light emanated by said light amplification material and to transmit light of increased frequency transduced by said light frequency transducer.
Claim 2
Dependent Claim
37 words
The combination of claim 1 and wherein said one of said reflecting means is provided with a concave reflecting mirror for retro-directing light to said light frequency transducer and laser along said convergent and pupiled light path.
Claim 3
Dependent Claim
237 words
In combination: a light amplification material having a first dominant light wavelength output and at least one second subordinate light wavelength output; means for exciting said light amplification material to emit amplified light; said light amplification material disposed to emanate said light wavelengths along an optical axis; means for defining a reflecting cavity on said optic axis with said light amplification material therebetween including first and second reflecting means on said optic axis with said light amplification material therebetween, said first reflecting means including means for retro-directing a first frequency range of light emanated from said light amplification material along said optic axis and transmitting therethrough a second frequency range of light from siad optic axis; a light frequency transducer disposed between said first reflecting means and said light amplification material on said optic axis for receiving light from said light amplification material in said first frequency range and transducing said light to said second frequency range; a filter for disposition between said light frequency transducer and said second reflecting means optically selected to pass light of said subordinate wavelength output only; and, means for selectively moving said filter into and out of said optical axis whereby said light amplification material is excited to emit said first dominant light wavelength output with said filter out of said optic axis and excited to emit a second subordinate light wavelength output when said filter is in said optic axis.
Claim 4
Dependent Claim
166 words
In combination: a light amplification material having a first dominant light wavelength output and at least one second subordinate light wavelength output, said outputs all within a first preselected range; means for exciting said light amplification material to emit light by stimulated emission along a preselected optic axis; first and second mirror means disposed on both sides of said light amplification material on said optic axis for retro-directing light emanating from said light amplification material in said first preselected frequency range; a frequency doubler crystal disposed on said optic axis between said first reflecting means and said light amplification material for transducing light passing along said optic axis to a second preselected frequency range; said first reflecting means including light output means for passing light of said second preselected frequency range; means for passing one subordinate light wavelength output only; means for moving said passing means into and out of a disposition on said optic axis between said second mirror means and said frequency doubler crystal.
Claim 5
Dependent Claim
34 words
The combination of claim 5 and wherein said moving means disposes said passing means into and out of a disposition on said optic axis between said light amplification material and said second reflecting means.
Claim 6
Dependent Claim
38 words
The combination of claim 5 and wherein said moving means disposes said passing means into and out of a disposition on said optic axis between said ight amplification material and said frequency doubler crystal. said light reflecting lens
Claim 7
Dependent Claim
225 words
A laser cauterizer comprising: a YAG-Neodymium light amplification crystal disposed to emit amplified light by stimulated emission radiation along a preselected optical axis; means for defining a reflecting cavity on said optic axis with said light amplification crystal therewithin including first and second reflecting means on said optic axis for retro-directing light emanated by said amplification crystal; a frequency doubler crystal disposed on said optic axis between said first refelcting means and said light amplification crystal for doubling the frequency of said amplified light emitted by said YAG light amplification crystal; said first reflecting means adapted to pass light of said doubled frequency; a light polarizer mounted in phase relation with said frequency doubler crysTal and disposed on said optic axis between said frequency doubler crystal and said second reflecting means; a silicon filter for passing light in the range of 1.32 microns wavelength; means for moving said filter into and out of said optic axis between said frequency doubler crystal and second reflecting means; means for providing a light path pupiled at said frequency doubler crystal including a convex means surface integral with said YAG light amplification crystal and a concave reflecting surface integral with said first reflecting means; and means for tuning said frequency doubler crystal to correspond to the amplified light emission of said YAG light amplification crystal along said optic axis.
Claim 8
Dependent Claim
30 words
The combination according to claim 4 and including a frequency doubler crystal, means mounting said frequency doubler crystal to said filter for movement into and out of said optic axes.
Claim 9
Dependent Claim
24 words
The combination according to claim 9 and including first and second doubler crystals; means for mounting said filter to one of said doubler crystals.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-06 | 1977-02-05 | 1977-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-06 | 1981-02-05 | 1981-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-06 | 1985-02-05 | 1985-08-07 | $7700.00 | Window Closed / Lapsed |