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EP0288751A2 - Process for manufactering an electrode for contact-free lithotripsy - Google Patents

Process for manufactering an electrode for contact-free lithotripsy Download PDF

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Publication number
EP0288751A2
EP0288751A2 EP88104804A EP88104804A EP0288751A2 EP 0288751 A2 EP0288751 A2 EP 0288751A2 EP 88104804 A EP88104804 A EP 88104804A EP 88104804 A EP88104804 A EP 88104804A EP 0288751 A2 EP0288751 A2 EP 0288751A2
Authority
EP
European Patent Office
Prior art keywords
outer conductor
plastic
electrode
inner conductor
conductor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP88104804A
Other languages
German (de)
French (fr)
Other versions
EP0288751B1 (en
EP0288751A3 (en
Inventor
Klaus Dipl.-Ing. Pimiskern
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dornier Medizintechnik GmbH
Original Assignee
Dornier GmbH
Dornier System GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Dornier GmbH, Dornier System GmbH filed Critical Dornier GmbH
Publication of EP0288751A2 publication Critical patent/EP0288751A2/en
Publication of EP0288751A3 publication Critical patent/EP0288751A3/en
Application granted granted Critical
Publication of EP0288751B1 publication Critical patent/EP0288751B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K15/00—Acoustics not otherwise provided for
    • G10K15/04—Sound-producing devices
    • G10K15/06—Sound-producing devices using electric discharge
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/49117—Conductor or circuit manufacturing

Definitions

  • the invention relates to an axially backlash-free positive connection between the inner conductor and the outer conductor of an electrode for contact-free lithotripsy by means of shock waves that are generated by sparkover at an electrode.
  • connection between the inner conductor, insulation and outer conductor is known to design the connection between the inner conductor, insulation and outer conductor as an adhesive connection.
  • adhesive connections do not meet all requirements in practice. They are difficult to check and can come loose during transport or when used under impact loads.
  • the connection between the jacket of the sleeve-shaped inner conductor insulation and the bore of the outer conductor is particularly critical because the adhesive connection is subjected to high loads and can tear due to different thermal expansion coefficients of the components when the temperature changes during operation.
  • the invention has for its object to connect the inner conductor with the outer conductor of an electrode inexpensively and permanently safely with each other.
  • Fig. 1 shows a sectional view of an electrode as it is used for the contact-free crushing of concrements and is described in more detail, for example, in German patents P 26 35 635 and 35 43 881.
  • the view shows a metallic (preferably made of brass) inner conductor 2, a sleeve 6 located on the jacket 4 of the inner conductor 2 made of thermoplastic material (for example polycarbonate available under the trademark "Pocan 1505 nature") and a sleeve-shaped outer conductor 8, which like the inner conductor 2 consists of conductive material, for example brass.
  • the bore 10 of the outer conductor 8 has a circumferential annular groove 12 in the exemplary embodiment. If the metal sleeve of the outer conductor 8 is heated inductively, for example by means of the induction coil 14 (at 18 to 30 kV), the plastic of the sleeve 6 expands. Due to the greater thermal expansion of the plastic compared to the metal sleeve, the gap between the inner conductor 2 and outer conductor 8 sealed and the plastic pressed into the annular groove 12. After cooling, the plastic remains in the ring groove, since the expansion has gone beyond the plastic area. After cooling (and removal of the induction coil 14), the groove 12 results in a secure, form-fit connection free of axial play, between the inner conductor 2 and the outer conductor 8.
  • the inner conductor 2 forms a tip 20.
  • the metallic outer conductor 8 is connected to a second electrode tip 24 via a cage 22 formed from wires.
  • the plastic 6 expands and lies against the outer sleeve 8.
  • the entire wing gap 28 is sealed. With further heating in the area of the grooves 12 in the outer conductor 8, the pressure rises sharply.
  • the plastic state is reached, the plastic is forcibly molded into the grooves 12 of the outer conductor 8.
  • the entire connection is cooled with cold air (compressed air) which flows out of the openings 30 of the cooling device 32 immediately after molding.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
  • Details Of Connecting Devices For Male And Female Coupling (AREA)
  • Connections Effected By Soldering, Adhesion, Or Permanent Deformation (AREA)

Abstract

Positive-locking connection, axially free of play, between the external conductor and internal conductor of an electrode for contact-free lithotripsy. …<IMAGE>…

Description

Die Erfindung betrifft eine axial spielfreie Formschlussverbin­dung zwischen dem Innenleiter und dem Ausenleiter einer Elektro­de für die berührungsfreie Lithotripsie mittels Stoßwellen, die durch Funkenüberschlag an einer Elektrode erzeugt werden,.The invention relates to an axially backlash-free positive connection between the inner conductor and the outer conductor of an electrode for contact-free lithotripsy by means of shock waves that are generated by sparkover at an electrode.

Vorrichtung und Bauteile zur Verwendung bei der Lithotripsie befinden sich in A 61 B 17/22 der Internationalen Patentklas­sifikation (IPC) und in den USA auch in A 61 B 17/00.Devices and components for use in lithotripsy are in A 61 B 17/22 of the International Patent Classification (IPC) and in the USA also in A 61 B 17/00.

Es ist bekannt, die Verbindung zwischen Innenleiter, Isolation und Aussenleiter als Klebeverbindung auszuführen. Solche Klebe­verbindungen werden jedoch nicht allen Anforderungen in der Praxis gerecht. Sie sind schlecht zu prüfen und können sich während des Transports oder beim Einsatz unter stossförmiger Belastung lösen. Kritisch ist insbesondere die Verbindung zwi­schen dem Mantel der hülsenförmigen Innenleiterisolation und der Bohrung des Aussenleiters, weil durch verschiedenartige Wärmeausdehnungskoeffizienten der Bauteile bei Temperaturän­derung während des Betriebs die Klebeverbindung hoch belastet wird und reissen kann.It is known to design the connection between the inner conductor, insulation and outer conductor as an adhesive connection. However, such adhesive connections do not meet all requirements in practice. They are difficult to check and can come loose during transport or when used under impact loads. The connection between the jacket of the sleeve-shaped inner conductor insulation and the bore of the outer conductor is particularly critical because the adhesive connection is subjected to high loads and can tear due to different thermal expansion coefficients of the components when the temperature changes during operation.

Der Erfindung liegt die Aufgabe zugrunde, den Innenleiter mit dem Aussenleiter einer Elektrode fertigungstechnisch günstig und dauerhaft sicher miteinander zu verbinden.The invention has for its object to connect the inner conductor with the outer conductor of an electrode inexpensively and permanently safely with each other.

Diese Aufgabe wird durch die Lehre der Ansprüche gelöst.This task is solved by the teaching of the claims.

Die Erfindung wird nachfolgend anhand von Figuren näher er­läutert:
Es zeigen:

  • Fig. 1 eine Elektrode für die Lithotripsie in Schnittdarstel­lung und
  • Fig. 2 eine Einzelheit von Fig. 1.
The invention is explained in more detail below with reference to figures:
Show it:
  • Fig. 1 shows an electrode for lithotripsy in a sectional view and
  • FIG. 2 shows a detail of FIG. 1.

Fig. 1 zeigt eine Schnittansicht einer Elektrode, wie sie zur berührungsfreien Zertrümmerung von Konkrementen verwendet wird und beispielsweise in den deutschen Patentschriften P 26 35 635 und 35 43 881 näher beschrieben ist.
Die Ansicht zeigt einen metallischen (vorzugsweise aus Messing bestehenden) Innenleiter 2, eine auf dem Mantel 4 des Innenlei­ters 2 befindliche Hülse 6 aus thermoplastischem Kunststoff (z.B. Polycarbonat unter dem Warenzeichen "Pocan 1505 nature" erhältlich) und einen ebenfalls hülsenförmigen Aussenleiter 8, der wie der Innenleiter 2 aus leitendem Material, zum Beispiel Messing, besteht. Auf dem Aussenleiter 8 befindet sich eine weitere Hülse 9 aus Kunststoffmaterial, die der Fixierung der Elektrode in einem nicht gezeigten Gehäuse dient. Diese Hülse 9 umschliesst nur den vorderen Teil des Aussenleiters 8 und ist mit ihm über die Schulter 11 formschlüssig verbunden.Fig. 1 shows a sectional view of an electrode as it is used for the contact-free crushing of concrements and is described in more detail, for example, in German patents P 26 35 635 and 35 43 881.
The view shows a metallic (preferably made of brass) inner conductor 2, a sleeve 6 located on the jacket 4 of the inner conductor 2 made of thermoplastic material (for example polycarbonate available under the trademark "Pocan 1505 nature") and a sleeve-shaped outer conductor 8, which like the inner conductor 2 consists of conductive material, for example brass. On the outer conductor 8 there is a further sleeve 9 made of plastic material, which is used to fix the electrode in a housing, not shown. This sleeve 9 only surrounds the front part of the outer conductor 8 and is connected to it in a form-fitting manner via the shoulder 11.

Die Bohrung 10 des Aussenleiters 8 weist im Ausführungsbeispiel eine umlaufende Ringnut 12 auf. Wird die Metallhülse des Aussen­leiters 8 induktiv erwärmt, zum Beispiel mittels der Induktions­spule 14 (bei 18 bis 30 kV), so dehnt sich der Kunststoff der Hülse 6 aus. Durch die grössere Wärmeausdehnung des Kunststoffs gegenüber der Metallhülse wird der Spalt zwischen Innenleiter 2 und Aussenleiter 8 abgedichtet und der Kunststoff in die Ring­nut 12 gepresst. Der Kunststoff verbleibt nach dem Abkühlen in der Ringnut, da die Ausdehnung über den plastischen Bereich hinausgegangen ist. Durch die Nut 12 ergibt sich nach dem Abküh­len (und Entfernen der Induktionsspule 14) eine sichere axial spielfreie Formschlussverbindung, zwischen Innenleiter 2 und Aussenleiter 8.The bore 10 of the outer conductor 8 has a circumferential annular groove 12 in the exemplary embodiment. If the metal sleeve of the outer conductor 8 is heated inductively, for example by means of the induction coil 14 (at 18 to 30 kV), the plastic of the sleeve 6 expands. Due to the greater thermal expansion of the plastic compared to the metal sleeve, the gap between the inner conductor 2 and outer conductor 8 sealed and the plastic pressed into the annular groove 12. After cooling, the plastic remains in the ring groove, since the expansion has gone beyond the plastic area. After cooling (and removal of the induction coil 14), the groove 12 results in a secure, form-fit connection free of axial play, between the inner conductor 2 and the outer conductor 8.

In Fig. 1 ist zu erkennen, dass der Innenleiter 2 eine Spitze 20 bildet. Der metallische Aussenleiter 8 steht über einen aus Drähten gebildeten Käfig 22 mit einer zweiten Elektrodenspitze 24 in Verbindung. Während der induktiven Erwärmung mittels der In­duktionsspule 14 befindet sich zwischen den Spitzen 20, 24 ein Abstandshalter 26, der die Elektrodenspitzen genau positioniert.It can be seen in FIG. 1 that the inner conductor 2 forms a tip 20. The metallic outer conductor 8 is connected to a second electrode tip 24 via a cage 22 formed from wires. During the inductive heating by means of the induction coil 14 there is a spacer 26 between the tips 20, 24, which positions the electrode tips precisely.

Diese Positionierung der Spitzen 20, 24 bleibt nach Entfernen des Abstandhalters 26 dauerhaft durch die erfindungsgemässe Forschlussverbindung erhalten.After the spacer 26 has been removed, this positioning of the tips 20, 24 is permanently maintained by the positive connection according to the invention.

Der Verfahrensablauf wird anhand von Fig. 2 näher erläutert:The process sequence is explained in more detail with reference to FIG. 2:

Bei induktiver Erwärmung dehnt sich der Kunststoff 6 aus und legt sich an die äußere Hülse 8 an. Dabei wird der gesamte Flügelspalt 28 abgedichtet. Bei weiterer Erwärmug im Bereich der Nuten 12 im Außenleiter 8 steigt der Druck stark an. Bei Erreichen des plastischen Zustandes erfolgt ein zwangsweise Einformen des Kunststoffes in die Nuten 12 des Außenleiters 8. Nach dem Abkühlen ergibt sich ein sicherer Formschluß mit hoher Tragfähigkeit in axialer Richtung.
Um die Plastifizierung im Bereich der Nuten 12 zu begrenzen, wird sofort nach dem Einformen die gesamte Verbindung mit kalter Luft (Pressluft) abgekühlt, die den Öffnungen 30 der Kühleinrichtung 32 entströmt.In the case of inductive heating, the plastic 6 expands and lies against the outer sleeve 8. The entire wing gap 28 is sealed. With further heating in the area of the grooves 12 in the outer conductor 8, the pressure rises sharply. When the plastic state is reached, the plastic is forcibly molded into the grooves 12 of the outer conductor 8. After cooling, there is a secure positive connection with a high load-bearing capacity in the axial direction.
In order to limit the plasticization in the area of the grooves 12, the entire connection is cooled with cold air (compressed air) which flows out of the openings 30 of the cooling device 32 immediately after molding.

Durch die Erfindung ergeben sich folgende Vorteile:
- Axiale formschlüssige Verbindung von Innenleiter und Außenlei­ter (einstellbar, abhängig von Elektrodenabstand).
- Hohe axiale mechanische Belastung zwischen Innenleiter und Außenleiter durch Stoßwelle.
- Keine Beeinträchtigung der Isolierfestigkeit, Hochspannung bis 50 kV ist zulässig.
- Formschluß beseitigt Probleme durch Langzeitverhalten (Schrumpfen) des Kunststoffes.
- Exakte Fügung, um Elektrodenspalt genau einzustellen und geringe Toleranzen einzuhalten.The following advantages result from the invention:
- Axial positive connection between inner conductor and outer conductor (adjustable, depending on the electrode distance).
- High axial mechanical load between inner conductor and outer conductor due to shock wave.
- No impairment of the insulation strength, high voltage up to 50 kV is permitted.
- Positive locking eliminates problems due to long-term behavior (shrinking) of the plastic.
- Exact joining to set the electrode gap exactly and to maintain small tolerances.

Claims (2)

1. Formschlüssige Verbindung zwischen dem Innenleiter (2) und dem Aussenleiter (18) einer Elektrode für die berührungsfreie Lithotripsie, mit einem metallischen Innenleiter (2), der eine Spitze (20) bildet, einer isolierenden Kunststoff­hülse (6), die den Innenleiter (2) umgibt, einem die Kunst­stoffhülse (6) umgebenden Aussenleiter (18), der mit einem Käfig (22) für die zweite Spitze (24) verbunden ist, dadurch gekennzeichnet, dass die Bohrung (10) des metallischen Aus­senleiters (2) der mehrere Ringnuten (12) aufweist, in die das Kunststoffmaterial der isolierenden Hülse (6) axial form­schlüssig eingreift.1. Positive connection between the inner conductor (2) and the outer conductor (18) of an electrode for non-contact lithotripsy, with a metallic inner conductor (2) that forms a tip (20), an insulating plastic sleeve (6) that connects the inner conductor ( 2) surrounds an outer conductor (18) surrounding the plastic sleeve (6), which is connected to a cage (22) for the second tip (24), characterized in that the bore (10) of the metallic outer conductor (2) is the plurality Has annular grooves (12) into which the plastic material of the insulating sleeve (6) engages in an axially positive manner. 2. Verfahren zur Herstellung der formschlüssigen Verbindung nach Anspruch 1, dadurch gekennzeichnet, dass bei induktiver Er­wärmung das Kunststoffmaterial der Kunststoffhülse (6) den Fügespalt (28) zwischen Innenleiter (2) und Aussenleiter (18) abdichtet und sich das Material über den plastischen Bereich hinaus in die Nuten (12) ausdehnt, wodurch sich eine axial spielfreie Formschlussverbindung ergibt.2. The method for producing the positive connection according to claim 1, characterized in that with inductive heating, the plastic material of the plastic sleeve (6) Sealing joint gap (28) between the inner conductor (2) and the outer conductor (18) seals and the material extends beyond the plastic area into the grooves (12), resulting in an axially backlash-free positive connection.
EP88104804A 1987-04-25 1988-03-25 Process for manufactering an electrode for contact-free lithotripsy Expired - Lifetime EP0288751B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19873713884 DE3713884A1 (en) 1987-04-25 1987-04-25 CONNECTING A METAL SLEEVE TO A PLASTIC SLEEVE IN ITS HOLE
DE3713884 1987-04-25

Publications (3)

Publication Number Publication Date
EP0288751A2 true EP0288751A2 (en) 1988-11-02
EP0288751A3 EP0288751A3 (en) 1989-09-27
EP0288751B1 EP0288751B1 (en) 1994-01-05

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ID=6326294

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88104804A Expired - Lifetime EP0288751B1 (en) 1987-04-25 1988-03-25 Process for manufactering an electrode for contact-free lithotripsy

Country Status (3)

Country Link
US (1) US4938781A (en)
EP (1) EP0288751B1 (en)
DE (2) DE3713884A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4938781A (en) * 1987-04-25 1990-07-03 Dornier System Gmbh Method of orienting electrode tips
US6217531B1 (en) 1997-10-24 2001-04-17 Its Medical Technologies & Services Gmbh Adjustable electrode and related method

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4016054A1 (en) * 1990-05-18 1991-11-21 Dornier Medizintechnik SPARK RANGE FOR LITHOTRIPSY
ES2097848T3 (en) * 1992-09-28 1997-04-16 Hmt Ag APPARATUS FOR THE GENERATION OF SHOCK WAVES FOR THE CONTACTLESS DESTRUCTION OF CONCRETIONS IN BODIES OF ORGANISMS.
US5420473A (en) * 1993-10-12 1995-05-30 Thomas; Howard C. Spark gap electrode assembly for lithotripters
DE19718512C1 (en) * 1997-05-02 1998-06-25 Hmt Ag Production of shock waves for medical applications using spark discharge in water
DE19755985A1 (en) * 1997-12-17 1999-07-01 Rohwedder Gmbh U Co Kg Praezis Hot-embedding metal inserts into plastic

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1140247B (en) * 1960-07-08 1962-11-29 Siemens Ag Closing head for insulating tubes for high-voltage devices, e.g. B. Cable terminations
DE1291109B (en) * 1964-07-14 1969-03-20 Tecalemit Gmbh Deutsche Process for welding plastic pipes and welded joint formed according to the process
US3798094A (en) * 1972-01-27 1974-03-19 A Costa Method of securing a closure member to a plastic container
FR2268614A1 (en) * 1974-04-25 1975-11-21 Coflexip Metal armoured plastic pipes - for use as hoses under external hydrostatic pressure e.g. underwater oil prodn pipes
DE2635635C3 (en) * 1976-08-07 1979-05-31 Dornier System Gmbh, 7990 Friedrichshafen Spark gap for generating shock waves for the contact-free destruction of calculus in the bodies of living beings
GB2093139A (en) * 1981-02-18 1982-08-25 Jenkins Robert & Co Ltd Electrically insulating pipe joint
DE3543881C1 (en) * 1985-12-12 1987-03-26 Dornier Medizintechnik Underwater electrode for non-contact lithotripsy
DE8619055U1 (en) * 1986-07-16 1986-11-20 Richard Wolf Gmbh, 7134 Knittlingen Lithotripsy probe
DE3713884A1 (en) * 1987-04-25 1988-11-03 Dornier System Gmbh CONNECTING A METAL SLEEVE TO A PLASTIC SLEEVE IN ITS HOLE

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4938781A (en) * 1987-04-25 1990-07-03 Dornier System Gmbh Method of orienting electrode tips
US6217531B1 (en) 1997-10-24 2001-04-17 Its Medical Technologies & Services Gmbh Adjustable electrode and related method
CZ297145B6 (en) * 1997-10-24 2006-09-13 Medipool Treuhand- Und Beteiligungsgesellschaft Für Medizintechnik Gmbh System for automatic adjustment of mutual distance of electrodes for setting spark gap in electrohydraulic systems with impulse wave

Also Published As

Publication number Publication date
EP0288751B1 (en) 1994-01-05
US4938781A (en) 1990-07-03
DE3886806D1 (en) 1994-02-17
DE3713884A1 (en) 1988-11-03
DE3713884C2 (en) 1989-07-13
EP0288751A3 (en) 1989-09-27

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