WO2000042899A2

WO2000042899A2 - Guide electro-thermal head for controllable sonde

Info

Publication number: WO2000042899A2
Application number: PCT/BG2000/000004
Authority: WO
Inventors: Alexander R. Stefanow; Ivan R. Stefanow; Ranguel N. Petkov
Original assignee: Individual
Current assignee: Individual
Priority date: 1999-01-25
Filing date: 2000-01-25
Publication date: 2000-07-27
Anticipated expiration: 2001-07-25
Also published as: BG103110A; WO2000042899A3; AU2271500A

Abstract

A guide electro-thermal head for controllable sonde is proposed. It consists of a metal ring with segment inserted chips of Zener diodes which are always in opposite connection when supply of power to two segments and on the account of the thermal effect from the junction of the diode which is directly proportional to the voltage of the junction and the current through it, mainly the segment of the opposite connected diode is heated. In this way the thermal energy of the front of the guide pipe in the definite segment is localised. Change of the direction and the value of the voltage toward the set opposite each other segments changes as well the speed of turning of the adjacent material of thermoelastic pipe which turns itself and around the head due to the activity of the spring inserted in the wall of the guide pipe and hydraulic pressure. As a result of this the direction of the penetration of the sonde is regulated and controlled.

Description

GUIDE ELECTRO-THERMAL HEAD

FOR CONTROLLABLE SONDE

Field of the invention

The invention is guide electro-thermal head for controllable sonde with which through thermoelastic transformation of the material of the very sonde a penetration takes its course by definite space track to objects situated in complicated dimensional configurations and is applicable in the filed of microsurgery, research in medicine and techniques as well as for quick access to elements in complicated devices for checking, adjustment and repair.

State of Art

It is well known the solution of a channel [1] which consists of cylindrical diaphragm, turned concentrically to itself outside which is similar to the snail's horn and between the inside and the outside wall there is available concentrically and closed passive flexible pipe and lubricative fluid. After turning, the outside wall gets hardened and directs the movement of the inside flexible wall. The movement forward takes its course by pushing the inside wall of the diaphragm via a guide pipe of fibroendoscope.

This solution takes away to a great extent the friction during the penetration and the pulling out of the channel. It creates a steady basis of the operating tool on the account of the hard external wall, but the device of this type does not allow connection to a real system of control and can not operate in practice.

It is well known and the solution [2] of a channel with in-built net for control, hydraulic regulation and control system which consists of three coaxially located in each other pipes. The first pipe which is a central one, represents an operating channel for visualisation and operational interference. The second pipe above the first one, has controllable adapter from hard into plastic condition. The initial end of this second pipe is fixed to a flange and is turned to itself outside so that it can cover the initial end of the third guide pipe whose front ending directs the torsion and whose other end is connected with the case of a hydraulic cylinder via the piston. The first and the second pipe pass along the axial line of this cylinder. The second pipe is sealed with a plastic ring with the piston so that the pressure of the piston over the lubricative fluid in the cylinder transfer it as greasing layer between the second and the third pipe to the front of the channel where the rotation of the controllable pipe happens.

The first pipe is flexible, but sustainable to outside pressure.

The controllable pipe is extruded by a polymer with a programmable temperature adapter from hard into plastic condition with inserted in the wall longitudinal belts which are isolated from each other and made of metal strings and from each knot of this graticule there is an output on the outside wall of the pipe for electrical contact and each belt is connected via a relevant segment to a flange-collector situated at the back end of the pipe with a pole of controllable source of voltage.

The third guide pipe is flexible, but tension and stretching resistant. It has a metal ring at its front end.

This solution allows plastification by belts along all the length of the controllable pipe from the flange-collector to the front of turning on the account of heating due to the current which runs through the metal strings of two adjacent to each other belts and the metal ring of the guide pipe.

The disadvantage of this solution is that a significant amount of thermal energy is consumed for plastification of the whole pipe to the front of torsion and this energy afterwards must be taken away so that the outside wall of the turned pipe can be kept hard.

Technical Character of the Invention

The purpose of the invention is to create a device which will keep the advantages of the concentrically turning to itself channel localising the heating by segments at the very top. It regulates the speed of torsion of the material adjacent to these segments and relevantly its directing.

The guiding electro-thermal head for controllable sonde consists of metal ring with isolated inside wall and welded opposite to each other chips of Zener diodes along the outside wall and on the other side of each chip there is a welded metal segment from a cylinder with internal radius equal to the outside radius of the metal ring plus the thickness of the chip so that the in advance perforated and set front of the guide pipe to be lined from inside and outside by the metal ring and the metal segments having in mind that the metal segments are electrically isolated from each other and they are glued so the segments get in contact only via their outside surface with the metal strings stuck along the pipe which turns and at its beginning the guide pipe has a section of longitudinal elasticity.

Description of Drawings

Fig. 1 shows the connections of the guide electro-thermal head with the controllable sonde

Fig. 2 shows the scheme of the structure of the guide electro-thermal head for controllable sonde with which the direction of penetration is determined via a segment thermoelastic transformation of the material at the very top.

Fig. 3 shows an example of performance of the guide pipe with a longitudinal elastic section and connected with it guide electro-thermal head. Fig. 4 shows the scheme of connecting of the segments to the control net.

Description of Preferred Embodiments

The guide electro-thermal head for controllable sonde 4 shown on Fig.l and Fig.2 consists of metal ring 5 with isolated inside wall and welded opposite to each other chips 6,7,8 and 9 of Zener diodes by its outside wall as on the other side of each chip there is a welded metal segment 10, 11, 12 and 13 from a cylinder of inside radius equal to the outside radius of the metal ring 5 plus the thickness of the chip so that the in advanced perforated and set front of the guide pipe 3 be lined inside and outside from the metal ring 5 and the metal segments 10, 11, 12 and 13. The metal elements are electrically isolated from each other and are glued and only through the outside surface the segments get into contact with the metal strings 16, 17, 18 and 19 stuck along the surface of the pipe 2 which gets elastified and turns over and at the front the guide pipe 3 has a section of longitudinal elasticity from the inserted spiral spring 15 and the material around it.

The guide electro-thermal head for controllable sonde 4 shown on Fig.l and Fig.2 is connected so that the segments 10, 11, 12 and 13 are in continuous contact with the relevant metal strings 16, 17, 18 and 19 stuck longitudinally along the controllable pipe 2 around the guide pipe 3. When voltage supplied to two opposite groups of metal strings 16 and 17 to the relevant segments 11 and 13 as for instance it is shown on Fig.4, this voltage is distributed upon the junctios of the two opposite connected Zener diodes 7 and 9 as it is seen on Fig.2 and as drop over the resistance of the metal string of the running current I. On the account of the thermal effect from the junction of the diode which is directly proportional the voltage of the junction and the current through it, mainly the segment of the reverse connected diode is heated. In this way the heating energy of the front of the guide pipe is localised in the definite segment. By change of the direction and the value of the voltage to the opposite set segments, the speed of turning of the adjacent material of pipe 2 is changed due to the spring 15 and the hydraulic pressure HP. As a result of that the direction of the penetration of the sonde is controlled.

Claims

Patent claims

1. Guide electro-thermal head for controllable sonde consisting of guide pipe with a metal ring and turned around it thermoplastic pipe with metal strings glued along its surface on the side of the guide pipe featured out that on the metal ring (5) with isolated inside wall are welded opposite each other chips (6), (7), (8) and (9) of Zener diodes by the outside wall and on the other side to each chip a relevant metal segment (10), (11), (12) and (13) is welded from a cylinder of inside radius equal to the outside radius of the metal ring (5) plus the thickness of the chip so that the perforated in advance and set front of the guide pipe (3) be lined from inside and outside by the metal ring and the metal segments, as the metal elements are electrically isolated from each other and glued (14) and in this way it is only the outside surface of the segments which gets into contact with the metal strings (16), (17), (18) and (19) stuck along the surface of the pipe (2) which gets elastified and turns over, as so at its beginning the guide pipe (3) has a section of longitudinal elasticity from the inserted spiral spring (15) and the material around it.