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Publication numberUS1393720 A
Publication typeGrant
Publication dateOct 11, 1921
Filing dateAug 22, 1917
Priority dateAug 22, 1917
Publication numberUS 1393720 A, US 1393720A, US-A-1393720, US1393720 A, US1393720A
InventorsLomas Harry, Mortimer James
Original AssigneeLomas Harry, Mortimer James
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Hypodermic syringe
US 1393720 A
Abstract  available in
Previous page
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Claims  available in
Description  (OCR text may contain errors)



1,393,720. Patented 001111, 1921.




Specification of Letters Patent.

Patented Oct. 11, 1921.

Application filed August 22, 1917'. Serial No. 187,597.


To all whom it may concern:

Be it known that HARRY Loans and JAMES MORTIMER, subjects of the King of Great Britain and Ireland, residing at Hampden Residential Club, Kings Cross, London, N. VV., England, have invented a new and useful Hypodermic Syringe (for which I have filed application in England, July 26, 1916, Patent No. 107,833,) of which the following is a specification.

This invention relates to improvements in hypodermic syringes of the kind in which the fluid to be injected is contained in a tube between an outlet at one end thereof and a liquid-tight piston adapted to be pressed upon the said fluid to force it through the said outlet which is generally in a nozzle forming a reduced part of the tube and adapted for attachment to a needle and our invention has for its object to provide a means in such syringes whereby predetermined doses of the fluid may be automatically and successively measured during administration.

lVe attain this object by grooving the piston-rod alternately lengthwise and trans versely at its exterior, each lengthwise part corresponding in length to a part of the length of the tube having the capacity for the corresponding pro-determined dose and the transverse part of the groove being adapted to connect successive longitudinal parts and also to form stops for a gage-pin carried in a loose collar on the piston rod and adapted to cooperate with the grooves in automatically measuring the successive doses.

The accompanying drawings illustrate a syringe made in accordance with our invention.

Figure 1 is a front view of the instrument. Figs. 2 and 3 are front views partly in section of portions of the same drawn to an enlarged scale and Fig. at is a plan view, also partly in section, of the portions as shown in Fig. 3.

It will be seen that the syringe comprises the usual barrel B and piston P and that it also has a piston rod A provided with the usual thumbpiece. This rod A, according to our invention has a groove, the longitudinal parts G of which are connected together by transverse parts, shown as numbered 2, 3, 4 and 5.

Adapted to cooperate with the groove in STAT. 1., 1313.

the piston rod A is a collar C made to slide on the said piston-rod and provided with a pin D which projects radially on to the said groove.

Supposing the syringe to be charged and ready for the ad inistration of a dose of a predetermined quantity of fluid contained in a length of the barrel B represented by the length of the groove G shown between the numbered parts of the groove 2 and 3. The collar C is then set in the position shown in Fig. 1, that is to say upon the neck of the barrel B and with its pin D in the junction of the right-hand lengthwise part of the groove G with the transverse part thereof marked 2. The needle on the nozzle of the syringe is inserted where the injection is required. The thumbpiece is then pressed until the travel of the piston rod is arrested by the pin D, against which the rearmost wall of that part of the groove marked 3 then abuts as shown in Fig. 4 Then the exact predetermined quantity of fluid has been injected.

To inject the next successive dose the collar C, still resting on the neck of the barrel B, is turnd so that the pin D is located in the groove at the junction of the left hand lengthwise part of the groove with the transverse part thereof marked 3, and the pressure on the thumbpiece repeated.

The syringe is charged in the manner usual for charging such syringes; the collar C beingmaintained at the free end of the piston rod P throughout the suction strokes, and preferably this piston rod P is graduated in the usual way, in minims or the like markings, so that the instrument may be used in the ordinary way, and in this case also the collar C is retained at the free end of the piston rod.

This invention provides. a hypodermic syringe occupying but the minimum of space and by means of which exact doses may be administered with absolute certainty, the quantity ejected not being dependent on an approximation, as when a given number of more or less equal turns of a screw have to be relied upon. This syringe moreover, when a dose has been discharged, maybe laid aside and is not liable to eject any of the contained following close if its piston be accidentally moved, yet, after a turn throu h a small angle of the piston rod, and wit out any rearward movement of it, the instrument is ready for the next forward pressure of the rod and will then give another absolutely exact dose.

We claim I 1. In a hypodermic syringe comprising in combination a barrel, a delivery nozzle, a piston, a piston-rod secured to said piston and having a groove running alternately lengthwise and transversely at its periphery and a collar loosely fitting said piston rod and having a pin adapted to project into and engage said groove, substantially as described.

2. A hypodermic syringe comprising in combination, a barrel, a delivery nozzle, a piston in said barrel, a piston rod secured to said piston and having a groove running alternately lengthwise and transversely at its periphery, a neck on said barrel, a collar loosely fitting said piston rod and adapted to abut against said neck and having a pin projecting into and engaging said groove, substantially as and for the purposes set forth.

3. A hypodermic syringe embodying therein a barrel, a delivery nozzle, a piston slidably and rotatably mounted insaid barrel, a piston rod, and cooperating means carried by said piston rod and said barrel, whereby the movement of said rod and said piston, is limited to an alternate axial, and rotative movement.

In witness whereof we have signed this specification in the presence or two witnesses.


Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2502639 *Feb 16, 1948Apr 4, 1950American Instr CorpHypodermic syringe
US2648334 *Oct 28, 1949Aug 11, 1953TurnbullHypodermic injection assembly
US2844148 *Oct 13, 1955Jul 22, 1958Raife ArchieHypodermic syringe
US4050459 *May 20, 1976Sep 27, 1977Anacleto Montero SanchezHypodermic syringe
US4832694 *Feb 8, 1988May 23, 1989Raphael Iii Julian JProgrammed action hypodermic syringe
US4871094 *Apr 29, 1988Oct 3, 1989Alcon Laboratories, Inc.Means and method for dispensing substances
US5318544 *Oct 20, 1992Jun 7, 1994Kerr Manufacturing CompanyMetering syringe
US5685864 *Jun 14, 1995Nov 11, 1997Interventional Research TechnologiesLocking device for aspirator, syringe or like instrument
US6382465 *Aug 31, 2000May 7, 2002Ing. Ercih Pfeiffer GmbhDispenser for the optionally atomized discharge of an in particular liquid medium from a container
US6679248 *Jul 19, 2001Jan 20, 2004Ing. Erich Pfeiffer GmbhDischarge apparatus for media
US8342370Aug 21, 2007Jan 1, 2013Norwich Pharma Technologies LimitedDosage dispensing canister
US8851339 *Mar 12, 2010Oct 7, 2014S.C. Johnson & Son, Inc.Applicator for self-adhesive products
US8939959Jun 20, 2013Jan 27, 2015Becton, Dickinson And CompanyDose dividing delivery device
US20090326442 *Aug 21, 2007Dec 31, 2009Norwich Pharma Technologies LimitedDosage dispensing canister
US20100076370 *May 9, 2009Mar 25, 2010Infusion Advancements, LLC.Apparatus and methods for purging catheter systems
US20110033224 *Mar 12, 2010Feb 10, 2011S.C. Johnson & Son, Inc.Applicator for Self-Adhesive Products
US20130197446 *Oct 7, 2011Aug 1, 2013Shl Group AbMedicament Delivery Device
CN103687637A *May 7, 2012Mar 26, 2014Shl集团有限责任公司Device for medicament delivery with syringe-like usability having a locking mechanism
CN103687637B *May 7, 2012Nov 25, 2015Shl集团有限责任公司具有注射器般可用性并具有锁定机构的药物输送装置
EP0611035A1 *Jan 12, 1994Aug 17, 1994Owen Mumford LimitedImprovement relating to devices for generating intermittent motion
WO2012158095A1 *May 7, 2012Nov 22, 2012Shl Group AbDevice for medicament delivery with syringe-like usability having a restraining mechanism
WO2012158096A1 *May 7, 2012Nov 22, 2012Shl Group AbDevice for medicament delivery with syringe-like usability having a locking mechanism
U.S. Classification604/210, 12/142.00N
International ClassificationA61M5/315
Cooperative ClassificationA61M5/31595, A61M5/3156
European ClassificationA61M5/315F3B2