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1. WO1999000158 - DISPOSITIF POUR INDUIRE UNE ANESTHESIE

Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

[ EN ]

Claims-

1. A device for inducing local anaesthesia in a patient by inhibiting the passage of a nerve impulse through a
nerve containing portion of the patient, said device
comprising

a magnetic field generating means for producing a
moving magnetic field which is rotatable about an axis; and,

a support means arranged to support said nerve
containing portion of the patient in such relationship to said axis of rotation so as to co-operate with said magnetic field generating means such that rotation of
the magnetic field is able to induce a flow of
negatively charged particles within the nerve
containing portion towards the axis of rotation of the rotating magnetic field.

2. A device as claimed in claim 1, v:herein the rate of
change of flux linkage between the rotating magnetic
field and the nerve containing portion is sufficient to hyperpolarise a portion of a nerve cell membrane of the nerve containing portion, so blocking the conduction of nerve impulses by the nerve cell membrane

3. A device as claimed in either of claims 1 or 2, wherein the magnetic field generating means is adapted to
produce a rotating magnetic field having a rate of
change of flux linkage in a vacuum of at least 10
Webers .irf- . s_i , preferably 50 Webers .rrf-. s~- .

4. A device as claimed in any one of claims 1 to 3,
wherein the magnetic field generating means comprises at least one of an electromagnetic coil or a permanent magnet.

5. A device as claimed in any one of claims 1 to 4,
wherein the magnetic field generating means comprises
first and second magnets adapted to generate a
substantially uniform magnetic field therebetween. The axis of rotation of said magnetic field being parallel to the field direction of said magnetic field.

6. A device as claimed in any one of claims 1 to 6 further comprising a charged elongate member which extends
along the axis of rotation of the magnetic field,
wherein a first end of the elongate member is adapted such that in use it is located proximate to the nerve containing portion of the patient.

7. A device as claimed in any one of claims 1 to 5 further comprising an electrode connected the skin of the
patient and a conducting wire extending from the
electrode along the axis of rotation of the magnetic
field to earth.

8. A method of inducing local anaesthesia in a patient by- use of an anaesthesia device, the anaesthesia device comprising

a magnetic field generating means for producing a
moving magnetic field which is rotatable about an axis; and,

a support means arranged to support said nerve
containing portion of the patient in such relationship to said axis of rotation so as to co-operate with said magnetic field generating means such that rotation of the magnetic field is able to induce a flow of
negatively charged particles within the nerve
containing portion towards the axis of rotation of the rotating magnetic field; the method comprising the steps of

supporting said nerve containing portion of the patient on said support means and,

generating said rotating magnetic field.