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1. WO2000029062 - METHOD OF MANUFACTURING CELLULOSIC STRUCTURES, AND ELECTRODE ASSEMBLY COMPRISING AN EXPANDABLE-COLLAPSIBLE BODY

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[ EN ]

Claims :
1. A method of manufacturing a cellulosic structure, comprising:

providing a mandrel having a head portion and a neck portion, the head portion having an outer circumference greater than the neck portion;

dipping the mandrel into a cellulosic substance;

curing the cellulosic substance; and

separating the mandrel from the cured cellulosic substance.

2. The method of claim 1, wherein the mandrel is made of gelatin.

3. The method of claim 1, wherein the mandrel is made of polyethylene glycol.

4. The method of claim 1, wherein the mandrel comprises an expandable - collapsible structure, and
wherein the mandrel is separated from the
cellulosic substance by collapsing the mandrel.

5. The method of claim 1, further comprising regenerating the cured cellulosic substance.

6. The method of claim 5, wherein the cellulosic substance is cured in an acid bath.

7. The method of claim 1, further comprising freezing the mandrel prior to dipping the mandrel into the cellulosic substance.

8. The method of claim 1, further comprising coating the mandrel with an adhesive prior to dipping the mandrel into the cellulosic substance.

9. The method of claim 1, further comprising coagulating the celluslosic substance in a salt solution.

10. The method of claim 9, further comprising re- dipping the mandrel into the cellulosic substance.

11. The method of claim 1, wherein separating the cellulosic substance from the mandrel includes dissolving the mandrel in heated water.

12. The method of claim 1, wherein the head portion of the mandrel includes a plurality of channels, the method further comprising disposing a reinforcing support structure in one or more of the channels prior to dipping the mandrel into the cellulosic substance, such that the support structure is embedded at least partially within the cured cellulosic substance.

13. The method of claim 1, wherein the head portion of the mandrel includes a generally flat distal region having a recessed area, the method further comprising placing an operative element in the recessed area prior to dipping the mandrel into the cellulosic substance, such that the operative element is embedded at least partially within the cured cellulosic substance.

14. The method of claim 1, wherein the mandrel is first dipped in the cellulosic substance head portion first, and then dipped in the cellulosic substance neck portion first.

15. The method of claim 1, further comprising masking at least a portion of the cellulosic substance with a non- porous masking primer.

16. An electrode assembly, comprising:

an expandable - collapsible body having a wall with a distal region configured to contact body tissue, the wall having an interior surface surrounding an interior area, the interior area configured to receive a medium containing ions; and

a biasing device adapted to resiliently urge the distal region of the wall against adjacent body tissue.

17. The electrode assembly of claim 16, further comprising a tissue contact evaluating mechanism.

18. The electrode assembly of claim 17, wherein the tissue contact evaluating mechanism comprises a spring, a shaft carried by the spring, and a receiver that slidably receives the shaft, the spring being adapted to resiliently urge the distal region of the wall against the body tissue through the shaft.

19. The electrode assembly of claim 18, wherein the shaft and the receiver are part of an electrical circuit configured for determining the displacement of the shaft, the shaft includes a first electrical resistivity and the receiver includes a second electrical resistivity, the resistivity of the respective shaft and the receiver depending upon the displacement of the shaft.

20. The electrode assembly of claim 16, wherein the biasing device comprises a spring, a shaft carried by the spring, and a receiver which slidably receives the shaft, the spring being adapted to urge the distal region of the wall against the body tissue through the shaft.

21. The electrode assembly of claim 16, wherein the wall is made of regenerated cellulosic substance.

22. The electrode assembly of claim 16, wherein the wall comprises includes a plurality of support ribs.