WO2008047380A2 - Cathéter amélioré destiné à chauffer des cavités corporelles - Google Patents

Cathéter amélioré destiné à chauffer des cavités corporelles Download PDF

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Publication number
WO2008047380A2
WO2008047380A2 PCT/IN2007/000123 IN2007000123W WO2008047380A2 WO 2008047380 A2 WO2008047380 A2 WO 2008047380A2 IN 2007000123 W IN2007000123 W IN 2007000123W WO 2008047380 A2 WO2008047380 A2 WO 2008047380A2
Authority
WO
WIPO (PCT)
Prior art keywords
catheter
tube
outlet
fluid
inlet
Prior art date
Application number
PCT/IN2007/000123
Other languages
English (en)
Other versions
WO2008047380A3 (fr
WO2008047380A8 (fr
Inventor
Prabhakar Vartak Taraprakash
Original Assignee
Prabhakar Vartak Taraprakash
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 Prabhakar Vartak Taraprakash filed Critical Prabhakar Vartak Taraprakash
Publication of WO2008047380A2 publication Critical patent/WO2008047380A2/fr
Publication of WO2008047380A3 publication Critical patent/WO2008047380A3/fr
Publication of WO2008047380A8 publication Critical patent/WO2008047380A8/fr

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
    • A61B18/04—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
    • A61B18/04—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating
    • A61B2018/044—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating the surgical action being effected by a circulating hot fluid

Definitions

  • This invention relates to an improved catheter used for heating of body cavities to effect ablation or fomentation of the area to be treated.
  • Catheters used for such therapies can be classified in two major types.
  • One type of catheter has heating elements situated within the catheter while the second type has externally heated fluid circulating in and out of the catheter.
  • This invention relates to the second i.e. circulating type of catheter. All such catheters known in prior art have two passages side by side, one for inlet of fluid and the other for outlet. Following patents describe such catheters.
  • Non- circulating type of catheters have only one passage while the circulating type need atleast two passages.
  • the circulating type catheter having passages side by side result into larger diameter. This is the first shortcoming of the catheters in prior art.
  • a second shortcoming in prior art is that the circulating hot fluid heats all parts of catheter. When inserted into the target body cavity, other non targeted body parts also receive the heat e.g. vagina and cervix in case ofendometrial ablation.
  • the inlet and outlet passages are made co-axial instead of usual side-by-side configuration (f ⁇ g.-l).
  • the side-by-side tube configuration has inlet tube (21) and outlet tube (22), while co-axial configuration has inlet tube (23) and outlet annular gap (24).
  • This invention relates to an improved catheter used for heating of body cavities to effect ablation or fomentation of the area to be treated.
  • Catheters used for such therapies can be classified in two major types.
  • One type of catheter has heating elements situated within the catheter while the second type has externally heated fluid circulating in and out of the catheter.
  • This invention relates to the second i.e. circulating type of catheter. All such catheters known in prior art have two passages side by side, one for inlet of fluid and the other for outlet. Following patents describe such catheters
  • Non-circulating type of catheters have only one passage while the circulating type need atleast two passages.
  • the circulating type catheter having passages side by side result into larger diameter. This is the first shortcoming of the catheters in prior art.
  • a second shortcoming in prior art is that the circulating hot fluid heats all parts of catheter. When inserted into the target body cavity, other non targeted body parts also receive the heat e.g. vagina and cervix in case of endometrial ablation.
  • the inlet and outlet passages are made co-axial instead of usual side-by-side configuration (fig.-1).
  • the side-by-side tube configuration has inlet tube (21) and outlet tube (22), while co-axial configuration has inlet tube (23) and outlet annular gap (24).
  • Simple calculations show that for equal inlet and outlet cross section the outer dimension of the co-axial- tube configuration is smaller than side-by-side-tube configuration.
  • the smaller diameter of catheter is particularly advantageous in endometrial ablation because the required dilation of cervix is smaller.
  • the air-gap (26) between the third outer tube (25) and middle tube serves as heat insulation. To further improve the insulation this gap can be partially or fully evacuated with help of known devices.
  • Three coaxially mounted tubes (1), (2) and (3) are separated by spacers (not shown) at distal end of catheter.
  • a flexible balloon (4) is attached to the tube (3).
  • Hot pressurised fluid coming in from the innermost tube (1) distends the flexible balloon, the fluid then exits from middle tube (2).
  • the air gap (5) between outer tube (3) and the middle tube (2) serves as thermal insulation between hot middle tube and patient's body parts.
  • a manifold with three chambers (6), (7), & (8) is provided at the proximal end of the improved catheter of this invention. These chambers are hydraulically isolated from each other by spacers (9), (10) (11). Connectors (12), (13) and (14) are provided to the chambers for connecting to external tubing. Hot fluid enters at (14), travels through the chamber (8) and via inner tube to the balloon, returns via middle tube to chamber (7) and exits through connector (13).
  • Connector (12) can be connected to a device to create partial or full vacuum in the airgap (5) of catheter. A simple device as shown in figure 3 to create this vacuum can be attached to connector (12).
  • This device is a ⁇ ' connector on one leg of which is a elastic bulb (15) with a one way valve (16) as shown. The second leg of ⁇ connector is open to air and has another one way valve (17) as shown.
  • outer tube (3) instead of connecting to chamber (6) can be sealed to middle tube as shown in figure 4.
  • the space between outer and middle tube can be permanently evacuated like a vacuum flask, thus serving as a permanent heat insulation.
  • a jacket (18) of insulating material preferably of a suitable polymer plastic, is provided (figure 2).
  • the improved catheter of this invention thus takes care of the shortcomings of the catheters of prior art.

Landscapes

  • Health & Medical Sciences (AREA)
  • Surgery (AREA)
  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Biomedical Technology (AREA)
  • Molecular Biology (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Plasma & Fusion (AREA)
  • Physics & Mathematics (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Medical Informatics (AREA)
  • Otolaryngology (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Infusion, Injection, And Reservoir Apparatuses (AREA)
  • Media Introduction/Drainage Providing Device (AREA)

Abstract

La présente invention concerne un cathéter amélioré de type à fluide circulant, destiné à chauffer des cavités corporelles. Dans l'art antérieur, de tels cathéters incorporent des passages d'entrée et de sortie côte à côte pour la circulation de fluide. Dans le cathéter de la présente invention, les passages sont concentriques l'un par rapport à l'autre, tandis que les zones de coupe sont maintenues identiques, ce qui réduit le diamètre externe efficace du cathéter. Ceci permet d'obtenir un cathéter plus fin, et donc plus facile à insérer dans le corps. Par ailleurs, lorsque le fluide chaud en circulation réchauffe toutes les parties du cathéter, même des parties non ciblées du corps reçoivent de la chaleur non désirée. Pour éviter ce problème, un troisième tube concentrique est adapté de manière coaxiale sur les tubes d'entrée et de sortie. La fente d'aération formée par le troisième tube sert d'isolation entre le fluide chaud et d'autres parties du corps. Afin d'améliorer davantage encore l'isolation, l'invention prévoit une simple disposition d'évacuation. Dans un mode de réalisation alternatif, cette fente d'aération peut être fermée hermétiquement et évacuée de manière permanente à la manière d'une bouteille isotherme.
PCT/IN2007/000123 2005-09-23 2007-03-26 Cathéter amélioré destiné à chauffer des cavités corporelles WO2008047380A2 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
IN1197/MUM/2005 2006-03-26
IN1197/MUM/2006 2006-03-26
IN1197MU2005 IN206553B (fr) 2005-09-23 2007-03-26

Publications (3)

Publication Number Publication Date
WO2008047380A2 true WO2008047380A2 (fr) 2008-04-24
WO2008047380A3 WO2008047380A3 (fr) 2008-07-03
WO2008047380A8 WO2008047380A8 (fr) 2010-12-09

Family

ID=39314463

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IN2007/000123 WO2008047380A2 (fr) 2005-09-23 2007-03-26 Cathéter amélioré destiné à chauffer des cavités corporelles

Country Status (2)

Country Link
IN (1) IN206553B (fr)
WO (1) WO2008047380A2 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000054684A1 (fr) * 1999-03-15 2000-09-21 Cryovascular Systems, Inc. Apport de fluide cryochirurgical
US20020091378A1 (en) * 1998-03-31 2002-07-11 Dobak John D. Method and device for performing cooling- or cryo-therapies for, e.g., angioplasty with reduced restenosis or pulmonary vein cell necrosis to inhibit atrial fibrillation
US20030060762A1 (en) * 2001-09-27 2003-03-27 Galil Medical Ltd. Cryoplasty apparatus and method
US20030199861A1 (en) * 2002-04-19 2003-10-23 Scimed Life Systems, Inc Cryo balloon

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20020091378A1 (en) * 1998-03-31 2002-07-11 Dobak John D. Method and device for performing cooling- or cryo-therapies for, e.g., angioplasty with reduced restenosis or pulmonary vein cell necrosis to inhibit atrial fibrillation
WO2000054684A1 (fr) * 1999-03-15 2000-09-21 Cryovascular Systems, Inc. Apport de fluide cryochirurgical
US20030060762A1 (en) * 2001-09-27 2003-03-27 Galil Medical Ltd. Cryoplasty apparatus and method
US20030199861A1 (en) * 2002-04-19 2003-10-23 Scimed Life Systems, Inc Cryo balloon

Also Published As

Publication number Publication date
WO2008047380A3 (fr) 2008-07-03
IN206553B (fr) 2008-07-25
WO2008047380A8 (fr) 2010-12-09

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