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Publication numberUS544014 A
Publication typeGrant
Publication dateAug 6, 1895
Publication numberUS 544014 A, US 544014A, US-A-544014, US544014 A, US544014A
InventorsFrank Terramorse
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Continuous-flow syringe
US 544014 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)

(No Model.)


Patented Aug. 6, 1895.




SPECIFICATION forming part of Letters Patent No. 544,014, dated'August 6, 1895.

Application filed March 25, 1895. Serial No. 543,143. (No model.)

To all whom it may concern.-

Be it known that I, FRANK TERRAMORSE, a

I citizen of the United States, residing in the city and county of San Francisco, State of California, have invented an Improvement in Continuous-Flow Syringes; and I herebydeclare the following to be a full, clear, and exact description of the same.

My invention relates to improvements in syringes.

It consists in a means for supplying the syringe and producing a continuous flow during the operation.

Referring to the accompanying drawings for a more complete explanation of my invention, Figure 1 is a View showing the bulb, the elastic tubes, and a .sectional View of the nozzle attachment. Fig. 2 is a modification of the device.

In the use of syringes of that class in which a compressible bulb is employed in connection with a suction and discharge pipe for the purpose of alternately drawing the liquid into the bulb when it is allowed to expand and forcing it out when compressed, the stream from the discharge becomes intermittent, and during the period of suction, either by leakage of the valve or from other causes, air will be drawn in through the discharge-nozzle, and if oily or unctuous preparations are to be used they will soon destroy the rubber. In my invention I overcome this difficulty by means of an attachment which I will now proceed to describe.

A is the bulb, B the inlet-pipe, and C the discharge-pipe. These being provided with suitable inlet and discharge valves in the manner usual to this class of suction and discharge apparatus I do not illustrate or describe with any particularity.

D is a cylindrical chamber, which may be of the usual form adopted for syringes or varied to suit special conditions. It is made of glass, hard rubber, or any metal or material suitable for the purpose, having a discharge-nozzle E of any desired construction and a plunger F. The discharge-pipe C from the bulb delivers into this chamber, which it serves to supply.

As shown in Fig. 1, the plunger-rod G is made tubular, and extends entirely through the plunger, the opposite end extending out through the rear end of the chamber and being connected with the tube C, which thus discharges through it.

Hisaspiralspring surrounding theplungerrod, abutting against the plunger at the inner end and against the cap I at the outer end, so that when the cap is in place the spring is compressed with sufficient force to normally press the plunger toward the discharge end of the barrel.

The operation will then be as follows: When the bulb is alternately compressed "and al-' lowed to expand, the liquid or substance to be discharged is drawn in through the suctionpipe and forced out through the dischargepipe C, and the end of the discharge-pipe connecting with the end of the hollow plungerrod, the liquid is discharged through this plunger-rod into the space between the plunger and the discharge-nozzle. The dischargenozzle is of smaller area than the passage through which the liquid passes into the barrel, and, consequently, theliquid cannot escape as fast as it is introduced. The result of this is to force the plunger back and compress the spring. The springthen reacting against the plunger and the liquid forces the latter continuously through the nozzle during the time while the second expansion and compression of the bulb takes place, and thereafter continuously as long as it is desired to operate the instrument. It will be manifest that the same efiect may be produced by connecting a discharge pipe or nozzle with the side of the reservoir or chamber and fitting this chamber with a plunger and spring, so that when the liquid is forced into the pipe faster than it can escape through thedischargenozzle it will enter the chamber and force the plunger back, and the spring acting against the plunger will gradually press it down to its normal position, thus producing a continuous dis charge in the same manner as previously described.

Various other modifications may be made in the mechanical construction without essentially changing the invention, the characteristic of it being the spring-actuated plunger and a supply of greater capacity than the discharge.

The device is especially useful for transmitting unctuous or oily substances which would soon destroy the rubber bulb and tubing it transmitted through them.

In my device a container K for the oily or other substance is connected with the chamber D, so that its contents maybe introduced into the chambernear the nozzle andwithout passing through the soft or destructible portion of the apparatus.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. A continuous flow syringe the discharge end of which is provided with a chamber into which the fluid enters, said chamber having a discharge nozzle, 2. plunger in the chamber having a hollow rod to permit the fluid to enter the chamber in front of the plunger, and a spring behind the plunger for holding the latter forward against the pressure of the column of fluid in front of it whereby a constant pressure is exerted upon the contents of the chamber. a

2. In a syringe an elastic bulb, induction and eduction pipes connected therewith with valves whereby the return of the liquid is prevented, a tubular chamber having a nozzle attached to its outer end, aplunger automatically movable therein under the influence of the liquid entering the chamber, said plunger having a spring acting to press it normally toward the discharge end of the chamber, a hollow plunger rod extending through the plunger at one end having the opposite end extending through the closed end of the cham- 3 5 her and connected with the eduction pipe from the bulb.

3. A continuous flow syringe having a chamber connected with its discharge end, and provided with a nozzle whose area is less than 40 the passage through which the liquid enters the chamber, and a spring-actuated plunger in the chamber, said plunger having a hollow rod connecting directly with the discharge of the syringe and also with the chamber whereby 4 5 the plunger is forced inward against thepower of its spring by reason of the accumulation of liquid infrontof it, and said spring re-acting against the plunger to exert a constant presswe on the liquid and a continuous flow from 50 the nozzle.

4. Ina syringe, an elastic bulb, induction and eduction pipes connected therewith, a discharge pipe or nozzle, a chamber or reservoir intermediate between the syringe eduction 55 pipe and the terminal nozzle, a spring-actuated plunger automatically movable within the chamber to exert a constant pressure upon the contents, and a reservoir with a connecting passage between it and the chamber near 6c the discharge nozzle.

In witness whereof I have hereunto set my hand.




Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2821193 *Jul 22, 1952Jan 28, 1958Geoffrey W WalkerMultiple injection inoculator instrument
US4537058 *Jul 6, 1982Aug 27, 1985Sensormedics CorporationVolume calibration syringe
US8267911Jun 8, 2007Sep 18, 2012Smiths Medical Asd, Inc.Flow-through fluid reservoir
Cooperative ClassificationA61M5/2033