US1373803A - Syringe attachment - Google Patents

Description

L. DUNN. SYHINGE ATTACHMENT. APPLICATION FILED MAR. l, I9I9.

. "g I IILL'I and the specially constructed syringes haveI :LOUIS DUNN, 0F MIN ons. nmirnsor.

SYBmGE ATTACHMENT.

inaasoe.

Speccation of Letters Patent.

Application led March 1, 1919. Serial No. 280,084.

To aZZwwm fit/may cofiwem:

Be it known that I, Lours DUNN, a citizen oi the United States, resident ot Minneapolis, county of Hennepin, State of Minnesota, have invented certain new and useful Improvements in Syringe Attachments, of which the following is a specification.

In surgical operations, when a local anesthetic is applied, diiiiculty isirequently eX- perienced 4with the syringes in general use, if the operation is one requiring tion of a considerable quantity of anesthetic fluid, owing to the fact that the needle through which the fluid is discharged into the tissues will frequently have to be removed or the syringe detached -therefrom for the purpose of refilling the syringe. The removal of the needle from the tissues not only involves loss of time, but 'there is .alf

ways danger that the point ot the needle may become contaminated during the' refilling of the syringe and the re-insertion of the needle into the tissues. Devices,

been madefor ply to the needle, but these are more or less obj ectionable, owing to the fact that an ordinary syringe cannot be employed with them,

so many tortuous passages and valves .that it is diicult to keep them clean and ready for use.

One of the principal objects therefore, ot` my invention, is to provide a syringe which will permit the injection into the tissues of the full amount of anestheticluid desired without the necessity ot removing the needle or detaching the syringe for re-{illing purposes.

A further object is to provide a syringe attachment which can be applied easily and quickly to a standard syringe and needle without any special adaptation orchange in construction.

A further object is to provide a syringe of this type with a glass or 'transparent barrel, whereby if the op needle into a vein, this fact will be rshown by blood entering the barrel vwhen the the injecincluding syringes of special construction, have delivering a continuous superator gets the pointof the provide against the injection of air bubbles, etc., into the veins of the patient.

The invention consists generally in various constructions and combinations, all as hereinafter described and particularly pointedv out in the claims.

In the accompanying drawings forming part of this specification,

Figure 1 is a view, showing my invention applied to a needle and syringe, ready for use,

Fig. 2 is an enlarged sectional view through the attachment, showing thepassages thereinand the check valve for preventing flow of the Huid backy to the Areceptacle,

Fig. 3 is a detail enlarged view, showing the manner of inserting. the point of the needle under the skin, or into the tissues of the patient,

Fig. 4 is a detail enlarged view of thev point ofthe needle.

In the drawing, -2 represents the barrel of a syringe, preferably formed of glass or transparent material, such as is in general use in surgical work. 3 is a glass plunger, having a ground joint with the barrel but mounted to slide freely therein to lill the barrel or eject the fluid therefrom. 4 is a finger grip device, preferably mounted on the barrel for convenience in holding it when in use.l 5 is an ordinary hypodermic needle having-a passage 6 therein with a compara-v tively sharp point 7 which is inserted under the skin or into the tissue to deliver the desired quantity of anesthetic uid at the oint desired. Thisneedle is referably o the type in general use, provi ed with an end 8 having a .tapered socket therein adapted to receive-the syringe nozzle when mounted directly thereon. When Vthe needle is so mounted and the contents of the syringe barrel discharged, it is necessary to remove the needle from the tissues and insert it into the iuid or detach the syrin e from the needle .to refill the syringe. y invention eliminates entirely the necessity of such removal or detachment and all danger of infection through contact of the point ot the Patented apr. 5, aaai.

syringe piston is drawn back. p

A further object is to provide a syringe attachment of simple construction which can 4be easily ke t clean and may be readily taken apart or examination or repairs.

A further object of the invention is to needle with the lingers of the operator or with some foreign substance. i

In carrying out my invention, I providea head 10 having-a plug 11 in one end thereof provided with a tapered socket 12 to .receive the tapered end. of the syringe nozzle 9, 110

' cates through the These parts Will t snugly together and be held by their frictional engagement from accidental separation, but may be easily and quickly pulled apart When the use of the syringe is completed or for any other purpose. These ltapered surfaces may be threaded, if preferred, such being an equivalent construction.

The head 10 is provided with a chamber 13 With which the syringenozzle communiplug 11, a nipple 14 is fitted intov the other end of the head 10 and communicates with the chamber 13 and said head and has a tapered outer end 16 which fits into the tapered socket in the end 8 of the needle and is held therein by frictional engagement. The head 10 has a passage 17 leading from the chamber 13 to a socket 18, the Walls of Which are preferably interiorly threaded to receive a coupling 19 having an end 20 for connection with a section of hose 21. A valve seat 22 is formed in the end of the coupling and a check valve 23 is provided in said coupling to allow the liquid to flow through the coupling to the chamber 13 and to prevent the return of the liquid from said chamber. One end of the hose section 21 is adapted to be inserted into a bottle or other receptacle 24 containing ya suitable fluid, and a Weight 25 is preferably provided on the open end of the hose section to hold it at the bottom of the fluid receptacle.

In using the device, the head 10 is interposed between -the standard syringe and standard needle and the needle inserted into the fluid and the plunger operated until the barrel of the syringe is filled. The pointed end of the needle is then inserted through the skin or in the tissues, as usual with hypodermic needles. Then the needle is pushed through the tissues to be anesthetized and at the same time the plunger is operated to dischargey the fluid. When the syringe is empty, the retraction 0f the plunger Will immediately fill it from the supply receptacle through the hose 21, the needle being left in the tissues and the discharge port in the end of the needle being closed by fluid cannot flow back to the syringe and interfere with t-he refilling of the syringe barrel from the fluid receptacle. As soon as the syringe has been refilled, the discharging operation may be resumed, the needle being moved in the same direction or in a different direction through the tissues and the operation of discharging and refilling the s ringe continued until the desired amount offenes thetic fluid has been used. In this Way I not only save considerable time inpreparing the i patient for an operation, but avoid the added danger of infecting the patient by repeated insertion of the needle. With my attachment only one puncture is necessary,

the tissues so that the injected the needle point being kept embedded and moved about inthe tissues, as long as it is necessary or desirable to obtain the desired anesthetic effect. The'attachment is so constructed that it can be used very readily with different sizes and styles` of syringes and needles, the taper of the syringe nozzle socket and the taper of the nipple to enter the socket in the needle adapting the device for variations in size. When the work has been completed, the syringe and needle can be easily and quickly detached from the head and the parts may then be easily sterilized and made ready for further use.

Byemploying a syringe barrel formed of glass or transparent material, the operator can see that the fluid he is about to inject into the body of the patient is free from air bubbles, and if it happens that the point of the needle has been inserted into a blood vessel When the piston is Withdrawn blood will enter the glass syringe barrel and be observable by the operator.` This Will demonstrate tohim that the point of the needle isin a blood vessel, and will Warn him to either push the needle point farther into the tissues or to Withdraw it from the blood vessel. In this Way the introduction of the anesthetic fluid lnto the blood current directly will be avoided. v

It Will be seen, therefore, that this attachment is particularly valuable for use in connection with syringes having glass or trans parent barrels, although I do not limit myself to barrels formed of such material.

While the syringe herein described is particularly adapted for ap lying local anesthetics in surgical Work, Fdo not limit myself to any particular purpose for this syringe, but the same may be employed Wherever it is desired to inject material hypodermically, or into any of the tissues of a patient.

I claim as my invention:

1. Thecombination, with a syringe and a needle having a passage therethrough and a point for insertion in to the tissues. of a head -having means for mounting the syringe nozzle and the shank of the needle therein, a passagebeing provided between said nozzle and needle through said head, a tube ha'vinrr one end for insertion into a fluid and connected at its other end with said head and means for closing the passage through s'aid tube to said head when 120 the-syringe plunger is projected and opening said passage when the plunger is retracted, and said syringe having a transparent barrel through the Walls of which the fluid in the syringe is visible and its condition may be determined Without withdrawing the needle from the tissues.

' 2. The combination, with a syringe having a transparent barrel and hypodermic needle, of a tube communicating at one end with a source of fluid supply and provided with means at its other end for mounting the nozzle of the syringe barrel and the needle therein, a normally unobstructed passage being provided between said syringe nozzle and said needle, means mounted toopen the passage between said fluid supply and said syringe when the syringe is operated, the transparent syringe barrel enabling the user to determine the condition of the fluid and the position of the needle in the tissues.

its other end with said head, and a valve which opens and closes when the vsyringe is operated.

4. The combination with a rigid transparent syringe, a head and a needle, rigidly but detachably connected and having an unobstructed passage therethrough whereby the syringe may serve as a handle for the insertion of the needle into tissue and the parts may be readily separated for cleaning, and a tube having one end for insertion into a iiuid and connected at its other end with said head, and a valve which` opens when the syringe plunger is retracted and closes when it is advanced, whereby the material in the syringe may be inspected and the syringe repeatedly operated without withdrawing it from the tissue.

5. The combination, with a syringe and a needle having a passage therethrough and a point for insertion into the tissues, of a head having sockets therein to receive the syringe nozzle and the shank of said needle there being an unobstructed communicating passage between said syringe and needle, said head having a coupling and a check valve therein and a port leading from said valve to said syringe and needle, a tube mounted on said coupling and having an end for insertion into a fluid, the retraction of said plunger when the point of said needle is closed opening said check valve automatically and filling the syringe from said fluid' supply and the projection of said plunger closing said valve and discharging vcally the fluid through said unobstructed passage to said needle.

6. The combination with a syringe having a nozzle thereon, of a head having a socket to receive said nozzle and a chamber in said head communicating with the passage through said nozzle, a coupling mounted on one side of said head and having a passage therethrough leading to said chamber and afiexible hose leading from said coupling to a source of liquid supply, a nipple mounted in said head and fitting the socket in a hypodermic needle and having a passage therethrough communicating with the chamber in said head, the nippleof said head, when inserted into the socket of the needle, forming a close joint therewith, a valve mounted in said coupling and normally closing the passage therethrough, said valve being mounted to open when suction is applied to said chamber'by the retraction of said syringe plunger to fill said syringe with liquid, the retraction of the plunger after the needle has been inserted into the tissues operating to open said valve and fill said syringe and the torward movement of said plunger operating to close said valve and project the liquid in the syringe through the passage in said nipple.

, 7. The combination, with a syringel and needle having a passage therethrough and a point for insertion into the tissues, of a head, 'a chamber formed in the head and having openings extending from the chamber through the head and providing oppositely disposed sockets extending from below the top of the chamber to receivethe syringe nozzle and the Shank of the needle whereby air bubbles may he trapped in the upper part of the chamber, there being an unobstructed communicating passage between the syringe and needle. point,means providing communication between said passage and a fiuid source and anautomatic check valve interposed in said communieating means to permit the fluid to pass only in a. direction from said source to said4Q passage, whereby when the needle point is'closed by insertion into the tissues, retraction of the syringe plunger automatiopens the check valve and fills the syringe from the fluid source vand projection of the plunger automatically closes the valve and forces the fluid through said unobstructed passage into the tissues.

ln witness whereof, have hereunto set my hand this 23d vday of February, 1919.

LOUIS DUNN, M. D.

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