DE3002088A1

DE3002088A1 - Electrically heated forceps pair - has helically wound wire embedded in insulating thermally resistive plastic for tissue embedding

Info

Publication number: DE3002088A1
Application number: DE19803002088
Authority: DE
Inventors: Georg 6900 Heidelberg Berg; Wolfgang H. Ing.(grad.) Druckrey
Original assignee: DRUCKREY WOLFGANG H
Current assignee: DRUCKREY WOLFGANG H
Priority date: 1980-01-22
Filing date: 1980-01-22
Publication date: 1981-07-23

Abstract

A pair of forceps, esp. for embedding tissue in hot liquid paraffin, is heated electrically so that the points of the forceps are maintained at a constant temp. above that of the melting point of the paraffin. This prevents the paraffin from solidifying on the forceps and thus sticking the tissue to them. A suitable resistive wire (2) is wound around the arms of the metal forceps at a suitable distance from the tips (1) of the forceps and ironlated pref. by thermally resistive plastic. A suitable, pref. low, electrical voltage is applied to the resistive wire so that a corresp. heating current flows through it. The helically wound part of the wire is embedded pref. in thermally resistive plastic (3). The end nearer the point (1) is protected by a metal ring (4).

Description

Elektrische Beheizung von Pinzetten Electric heating of tweezers

Die Erfindung betrifft die elektrische Beheizung von Pinzetten, die benutzt werden, um Gewebeproben in flüssiges,heißes Paraffin einzubetten. Es ist bekannt, daß Pinzetten über eine offene Bunsenbrennergasflamne angewärmt werden.Pür das Erreichen einer gleichbleibenden Temperatur an der Pinzettenspitze ist diese Erwärmungsmaßnahme ungeeignet. Es ist-weiterhin bekannt,Handhabungsgeräte elektrisch zu beheizen.The invention relates to the electrical heating of tweezers that can be used to embed tissue samples in liquid, hot paraffin. It is known that tweezers are warmed by an open Bunsen burner gas flame reaching a constant temperature at the tip of the tweezers is this Warming measure unsuitable. It is also known that handling devices are electrical to heat.

Für die Einbettung von Gewebeteilen in flüssiges, heißes Paraffin sind derartige Handhabungsgeräte ungeeignet.For embedding tissue parts in liquid, hot paraffin such handling devices are unsuitable.

Die Aufgabe der Erfindung ist es, an den Pinzettenspitzen eine gleichbleibende Temperatur zu erreichen, die silber dem Schmelzpunkt des verwendeten Paraffins liegt, um zu verhindern, daß das flüssige, heiße Paraffin an der kalten Pinzettenspitze erstarrt und das Gewebeteil an der Pinzettenspitze dadurch anklebt, wenn die Pinzette beim Einbettvorgang in das flüssige, heiße Paraffin getaucht wird.The object of the invention is to maintain a constant force at the tips of the tweezers To reach a temperature that is silver than the melting point of the paraffin used, to prevent the liquid, hot paraffin from sticking to the cold tip of the tweezers solidifies and the piece of tissue sticks to the tip of the forceps when the forceps is immersed in the liquid, hot paraffin during the embedding process.

Diese Aufgabe wurde dadurch gelöst, daß in einem geeigneten Abstand von den Pinzettenspitzen (1) und auf einer geeigneten Länge um die Schenkel einer metallenen Pinzette ein geeigneter Widerstandsdraht (2) , vorzugsweise durch wärmebeständigen Kunststoff isoliert, vorzugsweise wendelartig gewickelt wird und im Bereich der wendelartigen Umwicklung der Pinzettenschenkel in wärmebeständigen Kunststoff (3) eingebettet und zur Pinzettenspitze hin durch einen vorzugsweise metallenen Ring (4) geschützt wird und eine geeignete elektrische Spannung, vorzugsweise im Niederspannungsbereich, an diesen Widerstandsdraht so angelegt wird, daß ein entsprechender elektrischer Strom den Widerstandsdraht durchfließt und derart erwärmt, daß die Spitzen der Pinzettenschenkel eine Temperatur erreichen, die über dem Schmelzpunkt des verwendeten Paraffins liegt.This object has been achieved in that at a suitable distance from the tips of the tweezers (1) and at a suitable length around the legs of a metal tweezers a suitable resistance wire (2), preferably through heat-resistant Plastic is insulated, preferably wound in a helical manner, and in the area the helical wrapping of the tweezer legs in heat-resistant plastic (3) embedded and towards the tip of the tweezers by a preferably metal ring (4) is protected and a suitable electrical voltage, preferably in the low voltage range, is applied to this resistance wire so that a corresponding electrical Current flows through the resistance wire and is heated in such a way that the tips of the forceps legs Reach a temperature that is above the melting point of the paraffin used.

L e e r s e i t eL e r s e i t e

Claims

P a t e n t a n s p r ü c h e 1. Electrical heating of tweezers, especially of tweezers for embedding tissue parts in liquid hot paraffin , d u r c h e k e n n n z e i c h -n e t that around the thighs of a metal Tweezers at a suitable distance from the tweezer tips (1) a suitable one Resistance wire (2), preferably insulated by heat-resistant plastic, is preferably wound in a helical manner and a suitable electrical voltage, preferably in the low voltage range, applied to this resistance wire in this way is that a corresponding electric current flows through the resistance wire and heated in such a way that the tips of the forceps legs have a constant temperature that is above the melting point of the paraffin used.

2. Electrical heating according to claim 1, d a d u r c h g e k e n It should be noted that the resistance wire is on the length of the helical wrapping the tweezer legs are embedded in preferably heat-resistant plastic (3) .will.

3. Electrical heating according to claim 1, d a d u r c h g e k e.n n e i c h n e t that the resistance wire to the tweezers tip through a preferably metal ring (4) is protected.