US3570484A - Intravenous valve assembly - Google Patents

Abstract

The invention relates to devices for administering intravenous injections of liquids such as drugs, anesthetics or transfusion liquids. The device includes a valve body having a holder for an injection needle. The holder has an outlet passage which communicates with the needle. A nonreturn valve is arranged in the valve body. A valve operating plunger has a portion projecting from the body to enable the valve to be opened by operation of the plunger. The plunger has an inlet passage through which liquid to be injected can pass from a syringe into the valve body and thence pass the nonreturn valve to the outlet passage.

Description

O Unlted States Patent 11113,570,.484 72 Inventors Peter Leslie Steer 1,383,209 6/1921 lftiger 251/1491; London; 1,859,018 5/1932 Bedford.... 251/1496 Paul Hex Venn, Eastbourne, England 2,538,662 1/1951 Abbott 128/214 [21] Appl. No. 754,064 2,771,878 11/1956 Folland et al. 128/214 [22] Filed Aug. 20,1968 2,776,849 l/l957 Homuth 251/1496 [45] Patented Mar. 16,1971 2,999,499 9/1961 Willet..... 128/214 [73] Assignee Eschmann Bros. & Walsh Limited 3,064,648 11/1962 Bujan 128/214 Pnomy 7 Primary Examiner-Dalton L. Truluck 39,891 Att0rneyW1ll1am R. Liberman [54] INTRAVENOUS VALVEASSEMBLY 2 Claims, 2 Drawing Figs. [52] U 8 Cl 128/2l4 ABSTRACT: The invention il'elates to dheVICCS for admlmstere e intravenous i j ti f Sue as d g th ti 141/3021 251/1496 128/221 251/347 128/274 or transfusion liquids. The device includes a valve body having Clo e e e e e e e e e e e e s I e e e e e e e a h ld f an i j ti dl Th h ld h an tl t ofseal'ch passage communicates the needle A nonretum 218 (NV), 274; 251/1495, valve is arranged in the valve body. A valve operating plunger 141/291, 296, 302 has a portion pro ecting from the body to enable the valve to be opened by operation of the plunger. The plunger has an [56] References Cited inlet passage through which liquid to be injected can pass from UNITED STATES PATENTS a syrmge into the valve body and thence pass the nonretum 1,363,128 12/1920 Kitaoka 128/218 valve to the outlet passage.

INTRAVENOUS VALVE ASSEMBLY BACKGROUND OF THE INVENTION It is convenient to leave an indwelling needle in the vein of the patient so as to avoid repeated vein punctures. In order to introduce a needle into a vein, it is necessary to aspirate blood before giving the injection to make sure that the needle has been correctly located in a vein and not incorrectly located in the surrounding tissues. The anesthetist requires to see blood passing up above the hub of the syringe to indicate that the vein has been punctured. Where such repeated injections are required, the syringe is removed after the first injection, but is is convenient to leave the needle assembly in position on the patient. It is an object of the invention to provide a convenient needle assembly for this purpose.

BRIEF DESCRIPTION OF THE DRAWINGS .FIG. 1 is a sectional elevation of a device for administering intravenous injection to a patient; and

FIG. 2 is a plan view of the same device.

DESCRIPTION OF A PREFERRED EMBODIMENT The invention provides a device for administering intravenous injections which comprises a valve body having a holder which is arranged to receive an injection needle and has an outlet passage which communicates with the needle, a nonreturii valve within the body, and a valve operating plunger having a portion projecting from the body so that operation of the plunger will open the valve. The plunger has an inlet passage through which liquid to be injected can pass from a syringe into the valve body and thence pass the nonreturn valve to the outlet passage.

The administration device illustrated in the drawings comprises avalve body 1 with the administration device illustrated in the drawings comprises a valve body I which is of generally cylindrical shape and is made of plastics material. Thebody 1 has integral wings which enable the valve body to be attached to a patient. The wings can be secured to the patient by strapping, or preferably, have on the surface intended to contact the patient a coating of a self-adhesive material. If desired, the wings can be replaced by an integral attachment disc.

One end of thevalve body 1 receives a needle holder orhub 3 which is attached to an injection needle (not shown) which can be inserted in the vein of a patient. The needle holder or hub has anoutlet passage 4 through which liquid can pass to the needle and thence to the patienLThe other end of the valve body contains aplunger 5 which is also of plastics material and has an inlet passage 6 through which an injection liquid can pass from a syringe. The outer end of theplunger 5 is of smaller diameter than the main portion of the plunger inside the valve body. The shoulder formed between the two portions of the plunger engages anabutment 7 inside the valve body so that the plunger cannot fall out of the body. The inner end of the inlet passage 6 of the plunger opens into a V-shaped recess 8 extending transversely of the plunger.

The inner recessed end of theplunger 5 is adjacent a rubber valve body 9. Acoil spring 10 bears between the valve body 9 and theneedle holder 3 to hold the valve member in a closed position against avalve seating 11 and, at the same time, to hold theplunger 5 against theabutment 7.

When it is desiredto administer an injection liquid to a patient the outlet end of a syringe is engaged with a locatingportion 12 of the valve body. The pressure of the outlet end of the syringe against the outer end of theplunger 5 will cause aspiration of the blood of the patient if the needle is correctly located in the vein. The pressure of the syringe on the plunger will also displace the valve member 9 from itsseating 11 and the liquid can therefore be forced from the syringe through the inlet passage 6, past the outside of the valve member 9 and out through theoutlet passage 4.

As the device is conveniently made of plastics material it is a dis osable unit epeated in ections can be made without it being necessary to remove the needle assembly.

We claim:

1. A device for administering injection of fluid into and withdrawal thereof from a patient, said device comprising an elongated hollow body apertured at both ends thereof, a hollow needle holder at one end of the body and a fluid receptacle engagement at the other end of said body, a valve seat within the body, a movable valve member within the body, a longitudinally apertured plunger located within the body and limitedly movable longitudinally therewithin, spring means within the body between the one endthereof and the valve member urging the valve member normally against the valve seat and the inner end of the plunger thereby to close off communication through the device, the outer end of the plunger being engageable by a fluid receptacle from the other end of the body wherein inward movement of the plunger under the influence of the fluid expressed from the engaged receptacle against the normal biasing of the spring within the body unseats the valve thereby to open communication through the valve body in both directions selectively from and to the fluid receptacle.

2. A device as inclaim 1 wherein the valve body, between the valve member seat and the said other end, is provided with an inwardly directed shoulder to limit longitudinal movement of the plunger within the body against the shoulder in a rearward direction under the normal biasing of the spring and against the valve member to the limit of compression of the spring means under positive forward movement of the plunger, the fluid receptacle engaging end of the plunger normally extending rearwardly of the body past the shoulder and being readily accessible for engagement by a movement controlling receptacle.

Claims (2)

1. A device for administering injection of fluid into and withdrawal thereof from a patient, said device comprising an elongated hollow body apertured at both ends thereof, a hollow needle holder at one end of the body and a fluid receptacle engagement at the other end of said body, a valve seat within the body, a movable valve member within the body, a longitudinally apertured plunger located within the body and limitedly movable longitudinally therewithin, spring means within the body between the one end thereof and the valve member urging the valve member normally against the valve seat and the inner end of the plunger thereby to close off communication through the device, the outer end of the plunger being engageable by a fluid receptacle from the other end of the body wherein inward movement of the plunger under the influence of the fluid expressed from the engaged receptacle against the normal biasing of the spring within the body unseats the valve thereby to open communication through the valve body in both directions selectively from and to the fluid receptacle.

2. A device as in claim 1 wherein the valve body, between the valve member seat and the said other end, is provided with an inwardly directed shoulder to limit longitudinal movement of the plunger within the body against the shoulder in a rearward direction under the normal biasing of the spring and against the valve member to the limit of compression of the spring means under positive forward movement of the plunger, the fluid receptacle engaging end of the plunger normally extending rearwardly of the body past the shoulder and being readily accessible for engagement by a movement controlling receptacle.

Images