Device for paracentesis and thoracentesis
First Claim
1. An apparatus useful for fluid withdrawal,a housing, the housing having a distal end and a proximal end and a chamber extending through the housing from the distal end to the proximal end;
- a catheter extending from the distal end of the housing;
a needle assembly including at least one needle, the needle assembly removably extending through the housing chamber and the catheter;
a chamber valve that may be opened or closed, the valve being disposed between the needle assembly and the chamber, and the valve having at least two sealing points, so that the valve is open when the needle assembly extends through the chamber and the valve is closed when the needle assembly is withdrawn from the housing, the valve preventing fluid and gaseous communication through the chamber when it is closed;
a handle removably attached to the housing, the handle being connected to the needle assembly so that the needle assembly may be removed from the housing chamber by removing the handle form the housing;
wherein the needle assembly comprises;
an outer needle having a proximal end and a sharp distal end;
an inner needle having a proximal end and a blunt distal end, the inner needle being slidably contained within the outer needle; and
a biasing element engaged with the inner needle and the outer needle so that the distal end of the inner needle projects distal to the distal end of the outer needle when no force is applied to the distal end of the inner needle.
5 Assignments
0 Petitions
Accused Products
Abstract
A method and apparatus for removing fluid from the body of a patient, such as in paracentesis and thoracentesis, is provided. Fluid may be withdrawn via a needle assembly including a sharp introducing needle and a retractile blunt needle. The needle assembly may be withdrawn after the introduction of a drainage catheter, and a valve with multiple sealing points prevents body fluids from leaking from the device through the needle space and prevents communication between the atmosphere and the patient through the needle space. A second drainage port may be used after the needle is withdrawn.
96 Citations
19 Claims
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1. An apparatus useful for fluid withdrawal,
a housing, the housing having a distal end and a proximal end and a chamber extending through the housing from the distal end to the proximal end; -
a catheter extending from the distal end of the housing; a needle assembly including at least one needle, the needle assembly removably extending through the housing chamber and the catheter; a chamber valve that may be opened or closed, the valve being disposed between the needle assembly and the chamber, and the valve having at least two sealing points, so that the valve is open when the needle assembly extends through the chamber and the valve is closed when the needle assembly is withdrawn from the housing, the valve preventing fluid and gaseous communication through the chamber when it is closed; a handle removably attached to the housing, the handle being connected to the needle assembly so that the needle assembly may be removed from the housing chamber by removing the handle form the housing;
wherein the needle assembly comprises;an outer needle having a proximal end and a sharp distal end; an inner needle having a proximal end and a blunt distal end, the inner needle being slidably contained within the outer needle; and a biasing element engaged with the inner needle and the outer needle so that the distal end of the inner needle projects distal to the distal end of the outer needle when no force is applied to the distal end of the inner needle. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method for fluid withdrawal, comprising:
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(a) inserting the distal end of a fluid withdrawal apparatus into a body of fluid, the fluid withdrawal apparatus including a housing with a chamber extending therethrough, a catheter extending distal to the housing, a handle attached to the proximal end of the housing, and a needle extending from beyond the distal end of the catheter through the catheter and housing, and attaching to the handle; (b) withdrawing fluid through the needle; (c) removing the needle from the housing by detaching the handle from the housing; (d) sealing the proximal end of the housing so as to prevent fluid and gaseous communication therethrough, the sealing being accomplished at least two sealing points. - View Dependent Claims (17, 18, 19)
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Specification