Flashback Blood Collection Needle
First Claim
1. A needle assembly comprising:
- a housing defining a housing interior, said housing comprising at least one cannula having a patient puncture tip extending from a first end of the housing and a non-patient puncture tip extending from a second end of the housing, the non-patient puncture tip and the patient puncture tip being in fluid communication with each other within the housing interior; and
a porous vent positioned within the housing interior separating the housing interior into a first chamber and a second chamber, the porous vent including pores for passage of fluid therethrough from the first chamber to the second chamber, said porous vent including a blocking member to control the flow of the fluid through the porous vent,wherein the sole communication path between the housing interior and the external environment is via the patient puncture tip.
1 Assignment
0 Petitions
Accused Products
Abstract
A needle assembly includes a transparent or translucent housing with a fluid inlet and outlet end, a flashback chamber, and a venting mechanism therebetween. The venting mechanism includes a blocking member to control the fluid flow in the venting mechanism so that it flows along the longest path through the vent. Substantially axially aligned inlet and outlet cannulas extend from the housing and communicate with the chamber. A sealable sleeve covers the external end of the outlet cannula. Relative volumes of the cannulas, the chamber, and the sleeve are selected to provide rapid reliable flashback indicative of venous entry with an internal vent positioned within the housing to divide the interior into first and second chambers, with the second chamber being adapted to maintain a negative pressure therein relative to the external environment so as to inhibit leakage of blood from the needle tip on withdrawal from the patient.
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Citations
37 Claims
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1. A needle assembly comprising:
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a housing defining a housing interior, said housing comprising at least one cannula having a patient puncture tip extending from a first end of the housing and a non-patient puncture tip extending from a second end of the housing, the non-patient puncture tip and the patient puncture tip being in fluid communication with each other within the housing interior; and a porous vent positioned within the housing interior separating the housing interior into a first chamber and a second chamber, the porous vent including pores for passage of fluid therethrough from the first chamber to the second chamber, said porous vent including a blocking member to control the flow of the fluid through the porous vent, wherein the sole communication path between the housing interior and the external environment is via the patient puncture tip. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A needle assembly comprising:
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a housing defining a housing interior, said housing comprising at least one cannula having a patient puncture tip extending from a first end of the housing and a non-patient puncture tip extending from a second end of the housing, the non-patient puncture tip and the patient puncture tip being in fluid communication with each other within the housing interior; and a porous vent positioned within the housing interior to separate the housing interior into a first chamber and a second chamber, the porous vent including pores for passage of fluid therethrough from the first chamber to the second chamber and a blocking member to control flow of the fluid through the porous vent such that the fluid flows in an axial direction through the porous vent, wherein the sole communication path between the housing interior and the external environment is via the patient puncture tip, and wherein the first end of the housing comprises an elongate longitudinal first portion having a first diameter and the second end of the housing comprises a second portion having a second diameter larger than the first diameter of the first portion. - View Dependent Claims (19, 20, 21)
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22. A needle assembly comprising:
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a housing defining a housing interior, said housing comprising at least one cannula having a patient puncture tip extending from a first end of the housing and a non-patient puncture tip extending from a second end of the housing, the non-patient puncture tip and the patient puncture tip being in fluid communication with each other within the housing interior; and a porous vent positioned within the housing interior separating the housing interior into a first chamber and a second chamber, the porous vent including pores for passage of fluid therethrough from the first chamber to the second chamber, said porous vent including a blocking member to control flow of the fluid such that the fluid flows in an axial direction through the porous vent, wherein the housing includes a rear hub having a cylindrical portion extending therefrom and into the first chamber toward the first end of the housing to define a portion of the first chamber, said cylindrical portion forming at least a portion of the blocking member, and wherein the sole communication path between the housing interior and the external environment is via the patient puncture tip. - View Dependent Claims (23, 24, 25, 26)
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27. A method of preventing leakage of blood from a patient needle tip in a needle assembly comprising:
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a) receiving blood through a patient puncture tip and into a first chamber of a needle assembly, the needle assembly comprising; i) a needle housing defining a housing interior, said housing comprising at least one cannula having a patient puncture tip extending from a first end of the housing and a non-patient puncture tip extending from a second end of the housing; and ii) a porous vent positioned within the housing interior and separating the housing interior into a first chamber and a second chamber, with the non-patient puncture tip and the patient puncture tip being in fluid communication with each other within the first chamber such that the sole communication path between the housing interior and the external environment is via the patient puncture tip, the porous vent including pores for passage of blood and air therethrough from the first chamber into the second chamber, said porous vent including a blocking member to control flow of the blood and air through the porous vent; b) establishing fluid communication between the non-patient puncture tip and a negative pressure source such that blood contained within the first chamber is drawn out of the non-patient puncture tip and air is drawn out of the second chamber through the porous vent, thereby establishing a negative pressure within the second chamber relative to the external environment of the needle assembly such that blood flows through the cannula into the first chamber and contacts the porous vent; and c) drawing blood and air through the pores of the porous vent toward the second chamber based upon the negative pressure established within the second chamber such that blood contained within a lumen of the patient puncture tip is displaced away from the patient puncture tip and toward the second chamber to prevent blood droplets from being present at the patient puncture tip. - View Dependent Claims (28, 29, 30, 31, 32, 33)
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34. A needle assembly comprising:
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a housing defining a housing interior, said housing comprising at least one cannula having a patient puncture tip extending from a first end of the housing and a non-patient puncture tip extending from a second end of the housing, the non-patient puncture tip and the patient puncture tip being in fluid communication with each other within the housing interior; a porous vent including an axial bore positioned within the housing interior separating the housing interior into a first chamber and a second chamber wherein the axial bore surrounds at least a portion of the at least one cannula, the porous vent including pores for passage of fluid therethrough from the first chamber to the second chamber; and a blocking member located adjacent to or within the axial bore of said porous vent, said blocking member configured to control flow of the fluid such that the fluid flows in an axial direction along a longitudinal path through the porous vent, wherein the sole communication path between the housing interior and the external environment is via the patient puncture tip. - View Dependent Claims (35, 36, 37)
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Specification