Multiple sampling needle having one-way valve

Claim 2

A multiple blood sampling assembly adapted to be coupled with an evacuated container to obtain blood samples from a patient, said assembly comprising: a. a housing having a forward end, a rear end, and having a chamber therein; b. a cannula mounted to the forward end of the housing, adapted for injection of a patient, and in fluid communication with the chamber; c. a valve mounting structure positioned within the chamber, said mounting structure having a recess therein; and d. a valve member mounted upon the mounting structure, said valve member having a resilient skirt in a normally sealing relation with the walls of the chamber, said skirt being capable of expanding against the chamber walls to prevent backflow towards the patient or collapsing to allow flow towards the rear end of the housing, and a protrusion extending towards the rear of the housing which is positioned within the recess in the mounting structure to prevent cocking of the valve.

Claim 3

An assembly as described in claim 1, wherein the valve member, skirt and protrusion are a one-piece elastomeric structure.

Claim 4

An assembly as described in claim 1 wherein the recess comprises a slotted hole defined by the mounting structure which includes two semi-cylindrical projections within the chamber.

Claim 5

An assembly as described in claim 1 wherein the housing includes means for attaching a holder for an evacuated container.

Claim 6

An assembly as described in claim 4 wherein the means for attaching a holder is a screw thread.

Claim 7

An assembly as described in claim 4 further including in combination a holder attached to the housing.

Claim 8

An assembly as described in claim 5 further including in combination an evacuated tube within said holder.

Claim 9

An assembly as described in claim 1 wherein a second cannula is attached to the rear end of the housing, said second cannula adapted for penetration of an evacuated container and being in fluid communication with the chamber.

Claim 10

An assembly as described in claim 1 wherein the physical structure and composition of the resilient skirt is such that said skirt maintains a sealing relationship with the chamber walls to prevent the flow of blood towards the rear end of the housing under tourniquet pressure.

Claim 11

An assembly as described in claim 1 wherein valve positioning means extend from the chamber walls towards the side of the valve member nearest the front end of the housing, said valve positioning means having a surface adjacent to said valve member and capable of limiting the forward motion thereof.

Claim 12

An assembly as described in claim 10 wherein a gap exists between said valve positioning means and said valve member.

Claim 13

An assembly as described in claim 10 or claim 11 wherein the front side of said valve member includes a planar surface and the surface of said valve positioning means adjacent said valve member is also planar.

Claim 14

An assembly as described in claim 12 wherein said valve positioning means includes a plurality of substantially T-shaped members extending from said chamber walls, said members extending rearwardly into said chamber towards said valve member, and the laterally extending portions of the T-shaped members being positioned adjacent said valve member.

Claim 15

An assembly as described in claim 3 wherein said valve member includes a body portion, the resilient skirt extending rearwardly from said body portion, said body portion including a substantially flat annular rear surface which rests upon said semi-cylindrical members, the width of said flat annular surface being greater than the width of said semi-cylindrical members such that said valve member is capable of limited lateral movement.

Claim 16

A multiple blood sampling assembly adapted to be coupled with an evacuated container to obtain blood samples from a patient, comprising: a housing having a forward end, a rear end, and having a chamber including substantially cylindrical side walls therein; a cannula mounted to the forward end of the housing which is adapted for penetration of a vein, said cannula being in fluid communication with said chamber; a valve mounting structure positioned within said chamber and extending towards the forward end of the housing; a valve member mounted upon said valve mounting structure, said valve member including a body portion and a skirt extending rearwardly from said body portion, said skirt normally contacting the cylindrical walls of said chamber, said valve mounting structure extending within said skirt so as to contact a rear surface of said body portion of said valve member; and valve positioning means extending rearwardly into said chamber from said housing, said valve positioning means having a rearward end adjacent the body portion of said valve member to limit the possible forward motion thereof, said valve mounting structure including a recess, said body portion of said valve member includes a rearwardly extending protrusion, said protrusion being positioned within said recess.

Claim 17

A multiple blood sampling assembly adapted to be coupled with an evacuated container to obtain blood samples from a patient, comprising: a housing having a forward end, a rear end, and having a chamber including substantially cylindrical side walls therein; a cannula mounted to the forward end of the housing which is adapted for penetration of a vein, said cannula being in fluid communication with said chamber; a valve mounting structure positioned within said chamber and extending towards the forward end of the housing; a valve member mounted upon said valve mounting structure, said valve member including a body portion and a skirt extending rearwardly from said body portion, said skirt normally contacting the cylindrical walls of said chamber, said valve mounting structure extending within said skirt so as to contact a rear surface of said body portion of said valve member; and valve positioning means extending rearwardly into said chamber from said housing, said valve positioning means having a rearward end adjacent the body portion of said valve member to limit the possible forward motion thereof, said valve mounting structure including a recess, said body portion of said valve member includes a rearwardly extending protrusion, said protrusion being positioned within said recess.

Claim 18

An assembly as described in claim 15 wherein said body portion of said valve member includes a flattened forward surface, said valve positioning means includes a flat rearward surface, the flattened forward surface of said valve member opposing the flat rearward surface of said valve positioning means.

Claim 19

An assembly as described in claim 15 wherein the recess is in the form of a slotted hole defined by two semi-cylindrical projections of the valve mounting structure.

Claim 20

An assembly as described in claim 17 wherein said body portion of said valve member includes a substantially flat annular rear surface which rests upon said semi-cylindrical members, the width of said flat annular surface being greater than the width of said semi-cylindrical members such that said valve is capable of limited lateral movement.

Claim 21

An assembly as described in claim 15 wherein said valve member is an integral elastomeric structure.

Claim 22

An assembly as described in claim 16 wherein said valve positioning means includes a plurality of substantially T-shaped members connected to the cylindrical side walls of said chamber, the laterally extending portions of the T-shaped members being opposite the points of connection to the side walls and spaced around the longitudinal axis of said chamber, said laterally extending portions including a flat rearward surface in opposed relation to the flattened forward surface of said valve member.

Claim 23

An assembly as described in claim 15 wherein a second cannula is attached to the rear end of the housing, said second cannula being in fluid communication with said chamber.

Claim 24

An assembly as described in claim 15 wherein said valve member is mounted on said valve mounting structure such that it is capable of limited lateral movement thereon, and there being a small gap between the valve member and the valve positioning means.