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Biomedical subjects

G Farin

Publications and source records attributed to G Farin.

9 recordsLinked to original sources
PubMed1994

Endoscopic argon plasma coagulation (APC) first clinical experiences in flexible endoscopy.

Argon plasma coagulation (APC) is a new mode of non-contact electrocoagulation in which current is applied to tissues by means of ionised argon gas (argon plasma). In open surgery, APC is used for the haemostasis of superficial, diffuse haemorrhages from parenchymatous organs and for the devitalization of various tissues. Experimental studies have shown the superiority of APC to standard electrocoagulation modes and surgical techniques due to its efficiency and limited tissue traumatisation. After developing and designing special probes which can be applied through flexible endoscopes and after testing these in in vitro studies, we have been able to utilise APC in both the gastrointestinal tract and the tracheobronchial system. From June, 1991 to September, 1992, 102 patients were treated endoscopically in 189 sessions with APC in the upper and lower gastrointestinal tract as well as in the respiratory system. The indications were malignant and benign tumours, diffuse haemorrhages of various origins and sites, tissue overgrowth after stent implantation, tissue remnants after endoscopic adenomectomy, and the conditioning of fistulas prior to fibrin sealing. In all cases, APC in flexible endoscopy was highly effective and easy to perform, with advantages over standard electrocoagulation. No problems or complications were observed. The limited depth of tissue coagulation (2-3 mm) with concomitant, efficient tissue coagulation allows application even in critical areas where there is risk of perforation, such as the duodenum or colon. For many indications, APC has replaced the Nd:YAG-laser, which was formerly used widely in our unit, Except for vaporisation of extended tumours, the APC shows remarkable advantages in nearly all applications.(ABSTRACT TRUNCATED AT 250 WORDS)

Adult↗
PubMed1994

Technology of argon plasma coagulation with particular regard to endoscopic applications.

Argon plasma coagulation is especially suited for thermal coagulation of tissue surfaces, for the haemostasis of surface bleeding and for the devitalisation of defined pathologic tissue layers. The maximum coagulation depth achievable under good control is 3-4 mm. Argon plasma coagulation has been tested successfully and is presently being used clinically in open surgery, especially for the haemostasis of surface bleeding in parenchymal organs. Consequently, the coagulation technique described here is gaining more and more interest in endoscopic surgery. The absence of the adhesion effect between the coagulation electrode and coagulum, of smoke production and of carbonization of the coagulum have played an important role in this development. There are already various applicators available for the endoscopic application of argon plasma coagulation. Their success is an encouragement to further development of this coagulation technique for endoscopic operations.

Argon↗
PubMed1993

Pneumatically controlled bipolar cutting instrument.

A multifunctional instrument for transanal endoscopic microsurgery is presented. This instrument combines the functions of cutting, coagulation, suction and/or rinsing. The automatically effected pneumatic control of the functional elements of such an instrument can improve its serviceability not only with regard to safety but also to its ergonomic features. This example also serves to point out the advantages such an instrument can offer for the logical linkage between various functions and for the devices needed for this purpose. The aim in developing such instruments is to provide the surgeon with instruments enabling him to control even technically demanding operations.

Air↗
PubMed1993

[Endoscopic argon gas coagulation--initial clinical experiences].

Argon-gas-coagulation represents a new method of contact free electrocoagulation, where RF-energy is applied to the tissue by means of ionized argon-gas. In the operative field argon-gas-coagulation has been used with success for hemostasis in several parenchymatous organs and for devitalization of various tissues. Experimental studies have shown the superiority of argon-gas-coagulation over standard electrocoagulation and surgical techniques due to its high efficiency and limited tissue traumatization. Having developed and designed special endoscopic probes and after in-vitro-studies we could utilize the method in flexible endoscopy as well. From June 1991 to September 1992, 102 patients were treated in 189 sessions with argon-gas-coagulation in the upper and lower gastrointestinal tract as well as respiratory system. The indications were: malignant and benign tumors, diffuse hemorrhages of various origins and of various sites, tissue overgrowth after stent-implantation, remaining tissue after endoscopic adenomectomy and conditioning of fistulas prior to fibrin sealing. In all cases argon-gas-coagulation in flexible endoscopy has been shown to be a very effective and easy to perform technique with advantages in comparison to standard electrocoagulation. Problems and complications have not been observed. The limited depth of tissue penetration (2-3 mm) coincident with efficient tissue coagulation allows the application even in critical areas such as the duodenum or colon. In many indications argon-gas-coagulation has replaced the former widely used Nd-YAG-laser in our unit. Except vaporisation of extended tumors, the argon-gas-coagulator shows remarkable advantages for nearly all applications.(ABSTRACT TRUNCATED AT 250 WORDS)

Adenomatous Polyposis Coli↗
PubMedDate not supplied

Ultrasonic dissection in combination with high-frequency surgery.

Ultrasonic surgery is a technique used for tissue-selective dissection. High-frequency surgery, on the other hand, is a technique which permits largely non-selective cutting of all tissue except bone. Whereas ultrasonic surgery has no haemostatic effect, high-frequency surgery is highly effective for haemostasis. The combined use of ultrasonic surgery and high-frequency surgery, particularly in endoscopic operations, can unite the advantages of both methods and thus improve surgical techniques or even permit applications which are difficult or impracticable with ultrasonic surgery or high-frequency surgery alone. Various possibilities for combining ultrasonic surgery and high-frequency surgery have not been exploited to date and therefore remain open for future development.

Dissection↗