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1. WO1999004705 - DEVICES, SYSTEMS AND METHODS FOR DETERMINING PROPER PLACEMENT OF EPIDURAL CATHETERS

Publication Number WO/1999/004705
Publication Date 04.02.1999
International Application No. PCT/CA1998/000720
International Filing Date 24.07.1998
IPC
A61B 17/34 2006.1
AHUMAN NECESSITIES
61MEDICAL OR VETERINARY SCIENCE; HYGIENE
BDIAGNOSIS; SURGERY; IDENTIFICATION
17Surgical instruments, devices or methods, e.g. tourniquets
34Trocars; Puncturing needles
A61N 1/05 2006.1
AHUMAN NECESSITIES
61MEDICAL OR VETERINARY SCIENCE; HYGIENE
NELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
1Electrotherapy; Circuits therefor
02Details
04Electrodes
05for implantation or insertion into the body, e.g. heart electrode
A61N 1/34 2006.1
AHUMAN NECESSITIES
61MEDICAL OR VETERINARY SCIENCE; HYGIENE
NELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
1Electrotherapy; Circuits therefor
18Applying electric currents by contact electrodes
32alternating or intermittent currents
34for producing anaesthesia
A61N 1/36 2006.1
AHUMAN NECESSITIES
61MEDICAL OR VETERINARY SCIENCE; HYGIENE
NELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
1Electrotherapy; Circuits therefor
18Applying electric currents by contact electrodes
32alternating or intermittent currents
36for stimulation, e.g. heart pace-makers
CPC
A61B 17/3401
AHUMAN NECESSITIES
61MEDICAL OR VETERINARY SCIENCE; HYGIENE
BDIAGNOSIS; SURGERY; IDENTIFICATION
17Surgical instruments, devices or methods, e.g. tourniquets
34Trocars; Puncturing needles
3401Puncturing needles for the peridural or subarachnoid space or the plexus, e.g. for anaesthesia
A61N 1/0551
AHUMAN NECESSITIES
61MEDICAL OR VETERINARY SCIENCE; HYGIENE
NELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
1Electrotherapy; Circuits therefor
02Details
04Electrodes
05for implantation or insertion into the body, e.g. heart electrode
0551Spinal or peripheral nerve electrodes
A61N 1/36021
AHUMAN NECESSITIES
61MEDICAL OR VETERINARY SCIENCE; HYGIENE
NELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
1Electrotherapy; Circuits therefor
18Applying electric currents by contact electrodes
32alternating or intermittent currents
36for stimulation
36014External stimulators, e.g. with patch electrodes
36021for treatment of pain
Applicants
  • TSUI, Ban, C., H. [CA]/[CA]
Inventors
  • TSUI, Ban, C., H.
Agents
  • GARWASIUK, Helen
Priority Data
60/053,71625.07.1997US
Publication Language English (en)
Filing Language English (EN)
Designated States
Title
(EN) DEVICES, SYSTEMS AND METHODS FOR DETERMINING PROPER PLACEMENT OF EPIDURAL CATHETERS
(FR) DISPOSITIFS, SYSTEMES ET TECHNIQUES PERMETTANT DE DETERMINER L'EMPLACEMENT IDEAL DES CATHETERS EPIDURAUX
Abstract
(EN) Methods and systems for determining the proper placement of an epidural catheter prior to administration of anesthetic is described. In a preferred embodiment, an aqueous fluid is introduced into an epidural catheter that has been inserted into the spine of a subject. Motor reactions by the subject in response to electrical current applied through the aqueous solution is monitored. By monitoring the motor response with respect to electrical stimulation, the proper placement of an epidural catheter can be differentiated from the placement of the catheter in subarachnoid, subcutaneous or epidural intravascular placement. Additionally, in the preferred embodiment, a wire is disposed within the catheter tube to facilitate the passage of electric current. However, to avoid electrochemical reaction of the wire with the aqueous solution and/or the subject's dural tissue, the wire does not extend completely to the distal end of the catheter tube.
(FR) La présente invention concerne des techniques et des systèmes permettant de déterminer l'emplacement idéal d'un cathéter épidural avant d'administrer une anesthésie. Dans un mode préféré de réalisation, on introduit un liquide aqueux dans un cathéter épidural précédemment introduit dans la colonne vertébrale d'un sujet. On surveille ensuite les réflexes moteurs que le sujet émet en réaction au courant électrique appliqué au moyen de la solution aqueuse. En surveillant la réaction motrice induite par la stimulation électrique, on peut distinguer entre l'emplacement idéal d'un cathéter épidural et l'emplacement du cathéter dans une zone intravasculaire épidurale, rachidienne ou hypodermique. Par ailleurs, dans le mode de réalisation préférentiel, un fil est disposé dans le tube du cathéter pour faciliter le passage du courant électrique. Cependant, pour éviter toute réaction du fil avec la solution aqueuse et/ou le tissu dural du sujet, le fil ne s'étend pas complètement jusqu'à l'extrémité distale du tube du cathéter.
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