EP0735907A1

EP0735907A1 - Safely-operated multishot sidearm injection site using a needleless injector

Info

Publication number: EP0735907A1
Application number: EP92919778A
Authority: EP
Inventors: Earl Hanson
Original assignee: MAXIMWELL INTERNATIONAL CO Ltd
Current assignee: MAXIMWELL INTERNATIONAL CO Ltd
Priority date: 1992-08-18
Filing date: 1992-08-18
Publication date: 1996-10-09
Also published as: BR9207158A; NO950624D0; SK33295A3; EP0735907A4; AU2581592A; NO950624L; FI950781A0; FI950781A

Abstract

A multishot sidearm injection site using a needleless injector is made up of a main body (21), an extension sidearm (22) and a silicone valve body (23); the extension sidearm (22) is attached to one side of the main body (21) and the silicone valve body (23) is laterally disposed in the through hole (212) of the main body (21) and in abutment against the extension sidearm (22). When medical solution is to be infused into a patient by means of the present injection site, a needleless syringe is inserted into the conical seat (221) of the extension body (22) with the microaperture valve stem (222) thereof fitting inside the male luer member of the applied injection syringe. An operation on the syringe will produce a pressure in the tubular injection opening (223), which will force the silicone valve body (23) to open so as to permit the injected medical solution to enter the delivery tube of the main body.

Description

SAFELY-OPERATED MULTISHOT SIDEARM INJECTION SITE USING A NEEDLELESS INJECTOR

BACKGROUND OF THE INVENTION

The present invention relates to a safely operated multishot sidearm injection site using a needleless injector which is equipped with a main body and an extension sidearm and a cylindrical silicone valve body which is laterally disposed inside the main body and in abutment with the extension sidearm so as to seal a tubular injection tube disposed through the center of a microaperture valve stem disposed in the extension sidearm into which a needleless syringe is inserted with the valve stem protruding into the inside of the male member of a standard tapered Luer fitting of injection syringes. When the needleless syringe is actuated, a pressure is applied to the valve body and push it open so as to permit the medical solution to be infused into the delivery tube of the main body, the loss of the pressure or removal of the injection syringe will make the valve body shut so that no air will be induced into the delivery tube. The principal characteristic of the present invention is the capability of prevention of embolisms as a result of air induction into the infusion delivery tube.

Referring to Fig. 1, a typical injection needle is connected to a dropper by way of a flexible rubber tube 10; and another improved Y shaped injection site is illustrated in Fig. 2 which is comprised of a main tube 11 and a branch tube 12 disposed at an angle at the side of and in-communication with the main tube 11. The branch tube 12 is sealed by a rubber cork 13. The main tube 11 is coupled to a delivery tube at each end. When a patient subject to a dropping injection is supplied with another medical solution, the common way is to infuse the solution directly into the rubber tube 10 or the branch tube 12 via the rubber cork 13 whereby the patient is free from another painful injection. The prior art injection sites have the following disadvantages:

1. A nurse has to hold the injection syringe with a single hand and pierce the pointed needle thereof into the rubber tube 10 or the rubber cork 13 held by another hand; it is rather possible that the needle can accidently hurt the hand of the nurse, making the nurse easily affected when the wound is in contact with the blood of a patient who suffers from AIDS which is contagious to people via blood or human mucous membrane. Therefore, the prior art injection sites are not safe enough to operate especially in a time when AIDS is threatening the innocent people by accidental contacts.

2. The repeated piercing of the pointed needle into the rubber tube 10 or the rubber cork 13 will produce miniature rubber debris which can be dropped into the injection delivery tube, and might cause bad effects on the patient subject to a dropping operation.

3. There are miniature holes produced on the rubber tube 10 or the rubber cork 13 as a result of repeated piercings by the pointed needles, causing air to come into the delivery tube; and the air induction into the infusion delivery tube will generate embolisms.

SUMMARY OF THE INVENTION

Therefore, the primary object of the present invention is to provide a safely operated multishot injection site using a needleless injector to infuse medical solution into the delivery tube so that no accidents caused by pointed needles can happen.

Another object of the present invention is to provide a safely operated multishot injection site using a needleless injector which is able to infuse medical solution into the injection delivery tube via a valve controlled injection tube so that no piercing holes will produce on the injection site and embolisms caused by the air induction into the infusion delivery tube can be prevented.

BRIEF DESCRIPTION OF THE DRAWINGS

Fig. 1 is a diagram showing a prior art injection needle for use in connection to a general dropper;

Fig. 2 is a sectional view showing a prior art Y shaped injection site;

Fig. 3 is a perspective diagram showing the exploded components of the present invention;

Fig. 4 is a perspective diagram showing the assembly thereof;

Fig. 5 is a sectional diagram showing the structure of the present invention;

Fig. 6 is a diagram showing the application of the present invention to a dropper system;

Fig. 7 is a sectional diagram showing the embodiment of • the present invention;

Fig. 8 is a sectional diagram showing another embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

Referring to Figs. 3, 4, 5, the safely operated multishot injection site of the present invention is comprised of a main body 21, an extension sidearm 22 and a valve body 23 wherein the injection site is made of clear engineering thermoplastic of sufficient clarity and strength to provide visual observations of internal fluid flow and the valve body 23 is made of flexible silicone.

The main body 21 is made in a tubular form with a tube 211 disposed therein and a laterally oriented through hole 212 in communication with the tube 211 of the main body 21 is integrally formed thereon for the insertion of the extension sidearm 22 into the main body 21.

The extension sidearm 22 is in a tubular form and is provided with a closed end with a tapered inner wall 221 defined therein. An inward protruded valve stem 222 is disposed at the center of the closed end of the sidearm 22 and is provided with a tubular injection hole 223 through which the medical solution is infused into the injection delivery tube. A pair of lugs 224 are disposed at the periphery of the opposite end of the closed end.

The valve body 23 is made in a cylindrical form and has . an outer diameter smaller than the smallest diameter of the through hole 211 so that when the valve body 23 is laterally disposed in the through hole 211, there is still room for the passage of medical solution.

Referring to Figs. 4, 5, in the assembly, the extension_* sidearm 22 is inserted into the laterally oriented through hole 212 of the main body 21 after the cylindrical valve body 23 is laterally located in the main body 21; and the closed end of the extension sidearm 22 is in abutment against the valve body 23 with the tubular injection through hole 223 sealed thereby.

As shown in Fig. 6, the present invention is connected to a dropper by way of closure piercing device 30, a filter device 31 is coupled to a volume controller 32 and the delivery tube 33 is extended therefrom; and the bottom end of the delivery tube 33 is connected to the present site 20, and another delivery tube 33 is coupled to an injection needle at the end of the dropper system.

As shown in Fig. 7, when another medical solution is to be added to the dropper system, a needleless syringe 40 taking the solution from a medical container is used to infuse the same into the dropper system. The protruded end 41 of the syringe 40 is inserted into tapered through hole 221 of the extension sidearm 22 with the valve stem 222 inserted into the hole of the protruded end 41. Due to the taper structure of the through hole 221 so that the air in the through hole can be expelled therefrom when the protruded end 41 of the syringe 40 is inserted into the through hole 221 and no air will be pumped into the delivery tube during the injection of the medical solution from the syringe 40, preventing the cause of embolisms in the blood vessel of the patient.

When the syringe 40 is in action to deliver medical solution into the site, pressure will force the silicone valve body 23 to open so as to permit the solution to be infused into the delivery tube 33 via the tubular injection hole 223; when the loss of the pressure or removal of the syringe 40 takes place, the deformed valve body 23 will resume to its original shape and make the • injection hole 223 so as to block the air to enter. Therefore, no matter how many times of the use of the injection site, no air at all can enter the dropper system. As shown in Fig. 8, the protruded end of the syringe can be provided with additional threads 42 so as to make the syringe 40 firmly secured to the lugs 224 of the extension sidearm 22. It can be apparently seen that the present invention has the following advantages:

1. The use of needleless syringe to infuse medical solution can effectively protect the nursing personnel from being accidentally hurt by needles.

2. The nursing personnel are free from the risk of being fatally affected as a result of hurting by needles.

3. The use of the needleless injection effectively avoids the repeated piercings of the delivery tube so as to prevent embolisms from happening as a result of air induction into the dropper system.

4. No rubber debris is produced due to the piercing of a needle.

5. The injection syringe can be firmly retained in place due to thy additional threads on the protruded end of the syringe which is attached to the lugs of the extension sidearm.

Claims

WHAT IS CLAIMED IS:

1. A safely operated multishot sidearm injection site using a needleless injector comprising:

a main body having a tubular through hole disposed therein being provided with a laterally oriented through hole which communicates with said tubular through hole;

an extension sidearm having a closed end with a protruded valve stem which is provided with an injection tube therein disposed at the center of said closed end thereof and a pair of lugs being disposed at the periphery of the opposite end of said closed end;

a cylindrical valve body made of silicone having a diameter smaller than the smallest diameter of said tubular through hole of said main body;

wherein said cylindrical valve body is laterally disposed in said tubular through hole of said main body and said closed end of said extension sidearm is inserted into the laterally disposed through hole of said main body with said valve body in sealing abutment with said injection tube of said extension sidearm.