&lt;title&gt;Argon Laser Vascular Welding: The Thermal Component&lt;/title&gt;

Kopchok, George E.; Grundfest, Warren S.; White, R.A.; Donayre, Carlos E.; Fujitani, Roy M.; Litvack, Frank; White, Geoffrey H.; Klein, Stanley R.; Morgenstern, Leon; Joffe, Stephen N.; Parrish, John A.

doi:10.1117/12.937356

Cited by 8 publications

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“…The temperature changes incurred while welding with the argon laser were similar to those observed in previous experiments in our laboratory [5]. The temperature increased quickly but was returned to baseline (32°C) with each drop of saline ( -1 drophec).…”

Section: Resultssupporting

confidence: 82%

CO₂ and argon laser vascular welding: Acute histologic and thermodynamic comparison

Kopchok

White

et al. 1988

Lasers Surg Med

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CO2 and argon lasers have been used successfully for vascular welding in both experimental and clinical settings. This study compared the thermodynamics during CO2 and argon laser welding of 1-cm longitudinal arteriotomies in a canine model. Continuous recordings using an AGA 782 digital thermographic system with spatial and thermal resolution of +/-0.2 mm and +/-0.2 degree C, respectively, were analyzed. A HGM argon laser using a 300-microns optic fiber held at 1 cm from the vessel edges (spot diameter = 2.8 mm) with concomitant room temperature saline irrigation (1 drop/sec) was used for argon welds. Total exposure time was 150 sec/cm. CO2 welds were performed with a Sharplan CO2 laser (spot diameter = 0.22 mm) with no irrigation for total exposure time of 10 sec/cm. Thermodynamic results and laser parameters are summarized as follows: Argon-n = 20; power = 500 mW; energy fluence = 1,400 J/cm2; Tmax = 48.8 degrees C; T mean +/- S.D. = 45.1 +/- 2.7 degrees C; CO2-n = 20; power = 150 mW; energy fluence = 3,000 J/cm2; Tmax 84.0 degrees C; T mean +/- S.D. = 60.7 +/- 9.8 degrees C. There was a significant difference (P less than .05) in thermal measurements between successful CO2 and argon vascular welds. Temperature rise during the argon welds was limited by saline irrigation. In contrast, during CO2 laser welding, the temperature rose quickly to its maximum and was maintained at a relatively high level as the laser progressed (0.1 cm/sec) along the anastomosis.(ABSTRACT TRUNCATED AT 250 WORDS)

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Section: Resultssupporting

confidence: 82%

CO₂ and argon laser vascular welding: Acute histologic and thermodynamic comparison

Kopchok

White

et al. 1988

Lasers Surg Med

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“…Predstavnici ove grupe lasera su He-Ne, argonski i CO 2 laseri 23 , − tečni laseri koji kao aktivnu sredinu koriste tečnosti kao što su benzol, nitrobenzol itd. Njihova talasna dužina kreće se od 1051−1055 nm 24 , − eksimerski laseri koji za aktivnu supstanciju imaju halogenide inertnih gasova (Kr 2 , Ar 2 , KrO i dr) 25 , − poluprovodnički laseri kod kojih je aktivna sredina kristal poluprovodnika. Predstavnici ovih lasera su Ga-As i Ga-Al-As laseri 26 .…”

Section: Fizika Laseraunclassified

Low-power laser therapy in the treatment of parodontopathy

Pejčić¹,

Grujicic²

2007

VOJNOSANIT PREGL

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<zakljucak> Zahvaljujuci opisanim terapijskim efektima, laseri male snage deluju na biolosko tkivo, prvenstveno antiinflamacijski, ali i stimulativno na reparacijske i regeneracijske procese u inflamiranoj gingivi. Zbog toga se laseri danas primenjuju kao dopunska, veoma uspesna, fizikalna metoda lecenja, koja, uz tradicionalnu periodontalnu terapiju, daje bolje rezultate lecenja i utice na duze odrzavanje postignutih terapijskih rezultata.

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Argon laser—welded arteriovenous anastomoses

White

Kopchok

Donayre

et al. 1987

Journal of Vascular Surgery

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This study compared the healing of laser-welded and sutured canine femoral arteriovenous anastomoses. Arteriovenous fistulas 2 cm in length were created bilaterally in the femoral vessels of 10 dogs and were studied at 1 (n = 2), 2 (n = 2), 4 (n = 3), and 8 (n = 3) weeks. In each animal, one anastomosis (control) was closed with running 6-0 polypropylene sutures, and the contralateral anastomosis (experimental) was sealed with an argon laser (0.5 watt, 4 minutes of exposure, 1830 J/cm2/1 cm length of anastomosis). At removal all experimental anastomoses were patent without hematomas, aneurysms, or luminal narrowing. Histologic examination at 4 weeks revealed that laser-welded anastomoses had less inflammatory response and almost normal collagen and elastin reorientation. At 8 weeks sutured anastomoses had significant intimal hyperplasia whereas laser repairs had normal luminal architecture. Tensile strength and collagen production, measured by the synthesis of hydroxyproline and the steady-state levels of type I and type III procollagen messenger ribonucleic acids, at the anastomoses and in adjacent vein and artery specimens were similar in sutured and laser-welded repairs at 2, 4, and 8 weeks. We conclude that argon laser welding of anastomoses is an acceptable alternative to suture techniques, with the advantage of improved healing without foreign body response and possible diminished intimal hyperplasia at the anastomotic line.

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<title>Argon Laser Vascular Welding: The Thermal Component</title>

Cited by 8 publications

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CO₂ and argon laser vascular welding: Acute histologic and thermodynamic comparison

CO₂ and argon laser vascular welding: Acute histologic and thermodynamic comparison

Low-power laser therapy in the treatment of parodontopathy

Argon laser—welded arteriovenous anastomoses

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<title>Argon Laser Vascular Welding: The Thermal Component</title>

Cited by 8 publications

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CO2 and argon laser vascular welding: Acute histologic and thermodynamic comparison

CO2 and argon laser vascular welding: Acute histologic and thermodynamic comparison

Low-power laser therapy in the treatment of parodontopathy

Argon laser—welded arteriovenous anastomoses

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About

CO₂ and argon laser vascular welding: Acute histologic and thermodynamic comparison

CO₂ and argon laser vascular welding: Acute histologic and thermodynamic comparison