Feed device for an epidural needle
First Claim
1. A feeding device for the introduction of a needle, having a needle point, into the epidural space of a person, comprising:
- a guide rail;
a needle;
a needle holder for holding said needle;
a guide block having said needle holder, said guide block being slidably arranged on said guide rail;
a piston rod positioned on said guide block, said piston rod extending into a cylinder, through a passage, which is capable of being filled with a liquid; and
,a piston positioned on said piston rod, said piston having a series of flow passages for a limited flow of the liquid.
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Accused Products
Abstract
A feeding device for an epidural needle which includes a guide rail having a guide block with a needle holder being slidable thereon is disclosed. The invention further includes a piston having a piston rod which is positioned upon the guide block with the piston rod extending into a cylinder filled with a liquid. The piston, which is positioned on the piston rod, includes flow passages for a limited flow of liquid. The feeding device of the invention allows for a reliable recognition of the epidural space of a patient by maintaining a constant feeding speed for the needle, irrespective of the feeding pressure applied.
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Citations
16 Claims
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1. A feeding device for the introduction of a needle, having a needle point, into the epidural space of a person, comprising:
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a guide rail; a needle; a needle holder for holding said needle; a guide block having said needle holder, said guide block being slidably arranged on said guide rail; a piston rod positioned on said guide block, said piston rod extending into a cylinder, through a passage, which is capable of being filled with a liquid; and
,a piston positioned on said piston rod, said piston having a series of flow passages for a limited flow of the liquid. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A feeding device for the introduction of a needle, having a needle point, into the epidural space of a person, comprising:
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a guide rail; a needle a needle holder for holding said needle; a guide block having said needle holder, said guide block being slidably arranged on said guide rail; a supporting plate carried upon said guide rail, said supporting plate being capable of placement upon the back of the person; a first piston rod positioned on said guide block, said first piston rod extending into a cylinder, through a passage, which is capable of being filled with a liquid; a piston positioned on said first piston rod, said piston having a series of flow passages for a limited flow of the liquid; and
,a syringe having a second piston rod and being received by said needle holder. - View Dependent Claims (9, 10, 11, 12)
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13. A feeding device for the introduction of a needle, having a needle point, into the epidural space of a person, comprising:
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a guide rail; a needle a needle holder for holding said needle; a guide block having said needle holder, said guide block being slidably arranged on said guide rail; a supporting plate carried upon said guide rail, said supporting plate being capable of placement upon the back of the person;
a first piston rod positioned on said guide block, said first piston rod extending into a cylinder, through a passage, which is capable of being filled with a liquid;a piston positioned on said first piston rod, said piston having a series of flow passages for a limited flow of the liquid; a back pressure valve arranged in said piston, said back pressure valve being closeable in a direction of insertion of said needle; and
,a syringe having a second piston rod and being received by said needle holder. - View Dependent Claims (14, 15, 16)
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Specification