Set for spinal anesthesia

Claim 2

A set for spinal anesthesia, comprising a hollow introducer needle; a spinal needle introducable through said introducer needle into subarachnoid space; a stylet extendable through said spinal needle; and means for immovably fixing said spinal needle and said introducer needle with one another when said spinal needle enters the subarachnoid space, said spinal needle being freely movable inside said introducer needle between a plurality of locations, said means for immovably fixing said spinal needle and said introducer needle engaging said spinal needle and said introducer nedle transversely to their direction of elongation in any of said plurality of positions and therefore fixing said spinal needle and said introducer needle in any of said plurality of positions.

Claim 3

A set for spinal anesthesia as defined in claim 1, wherein said means for immovably fixing said spinal needle and said introducer needle includes a screw extending through a wall of said introducer needle and abutting against said spinal needle.

Claim 4

A set for spinal anesthesia as defined in claim 2, wherein said introducer needle has a hub provided with said wall and having a threaded opening, said screw being screwable through said threaded opening of said hub of said introducer needle.

Claim 5

A set for spinal anesthesia as defined in claim 2; and further comprising an elastic member located adjacent to said spinal needle at a side opposite to said screw, so that when said screw abuts against said spinal needle, said spinal needle abuts against said elastic member.

Claim 6

A set for spinal anesthesia as defined in claim 1, wherein said means for immovably fixing said spinal needle and said introducer needle includes a squeezable clamp which can be squeezed onto a portion of said introducer needle so as to fixedly connect said needles with one another.

Claim 7

A set for spinal anesthesia as defined in claim 1, wherein said means for immovably fixing a spinal needle and said introducer needle engage said spinal needle and said introducer needle in any of said plurality of positions at a same transverse location of said spinal needle and said introducer needle.

Claim 8

A set for spinal anesthesia as defined in claim 1, wherein said means for immovably fixing a spinal needle and said introducer needle engage said spinal needle and said introducer needle in any of said plurality of positions at two different locations of said spinal needle and said introducer needle which are spaced from one another in direction of elongation of said needles.

Claim 9

A set for spinal anesthesia, comprising a hollow introducer needle; a spinal needle introducable through said introducer needle into subarachnoid space; a stylet extendable through said spinal needle; means for immovably fixing said spinal needle and said introducer needle with one another when said spinal needle enters the subarachnoid space, said means for immovably fixing said spinal needle and said introducer needle including a screw extending through a wall of said introducer needle and abutting against said spinal needle and an elastic member located adjacent to said spinal needle at a side opposite to said screw, so that when said screw abuts again said spinal needle, said spinal needle abuts against said elastic member, said means for immovably fixing said spinal needle and said introducer needle including a squeezable clamp which can be squeezed onto a portion of said introducer needle so as to fixedly connect said needles with one another, said clamp being tubular and has a first section provided with inner teeth and squeezable onto the portion of said introducer needle and a second section provided with inner teeth and squeezable onto the portion of the spinal needle.

Claim 10

A set for spinal anesthesia, comprising a hollow introducer needle; a spinal needle introducable through said introducer needle into subarachnoid space; a stylet extendable through said spinal needle; means for immovably fixing said spinal needle and said introducer needle with one another when said spinal needle enters the subarachnoid space, said means for immovably fixing said spinal needle and said introducer needle including a screw extending through a wall of said introducer needle and abutting against said spinal needle and an elastic member located adjacent to said spinal needle at a side opposite to said screw, so that when said screw abuts again said spinal needle, said spinal needle abuts against said elastic member, said means for immovably fixing said spinal needle and said introducer needle including a squeezable clamp which can be squeezed onto a portion of said introducer needle so as to fixedly connect said needles with one another, said clamp being tubular and has a first section provided with inner teeth and squeezable onto the portion of said introducer needle and a second section provided with inner teeth and squeezable onto the portion of the spinal needle.