Title:
Hypodermic and other syringes
United States Patent 2156023


Abstract:
This invention relates to hypodermic and the s like syringes, used for inoculating, drenching, P blood transfusions, and other similar purposes, P and of the kind wherein measured doses of liquid s s medicine are required to be administered, Syringes of the above type are well known and r consist...



Inventors:
Conrad, Mckay Angus
Application Number:
US17841337A
Publication Date:
04/25/1939
Filing Date:
12/06/1937
Assignee:
Conrad, Mckay Angus
Primary Class:
Other Classes:
92/13, 92/110, 604/186
International Classes:
A61M5/20
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Description:

This invention relates to hypodermic and the s like syringes, used for inoculating, drenching, P blood transfusions, and other similar purposes, P and of the kind wherein measured doses of liquid s s medicine are required to be administered, Syringes of the above type are well known and r consist broadly of a cylindrical barrel or sheath of metal; a barrel liner or glass within a metal i barrel or sheath; suitable caps for the ends of the barrel; means for operating a piston in the barrel and means for admitting the liquid to and discharging it from the barrel and means for adjusting the stroke of the piston with a view to regulating the amount of liquid discharged on each stroke of the piston.

An object of the present invention is to provide improved adjustable means whereby the amount of liquid discharged from the barrel or cylinder of the syringe at each outward stroke of the piston may be regulated at will.

The invention consists of a hypodermic or like syringe preferably having a graduated barrel of glass or other suitable transparent material, which can be fitted into a protecting sheath, provided with a cap of metal or other suitable material at each end, the sheath being so designed as to permit visibility of the contents of the glass barrel. This metal sheath may be fitted with a fixed or adjustable grip or hand piece suitable and convenient for the hand of the operator.

A piston or plunger made of metal or other suitable material is accurately fitted into the barrel.

The piston contains an inlet valve such as a ball valve held on its seat by a spring. From this inlet valve a channel is constructed to communicate with the interior of the barrel to allow the fluid to pass into the barrel of the syringe. The piston is connected to a hollow piston rod which may be graduated, and through which the fluid is admitted.

An auxiliary hollow piston rod, sleeve, or collar, which may be split longitudinally, is concentrically mounted about the hollow piston rod, said auxiliary hollow piston rod preferably extending through, and outwardly from, the inner metal cap of the sheath.

An annular collar, which may be integral with the auxiliary hollow piston rod, bears on the inner face of the inner metal cap and serves as a stop for the piston rod when drawn back to its normal position automatically under the influence of a spring such action charging the barrel in readiness for the next injection or discharge stroke.

The movable handpiece of the device, by which 56 the piston is actuated, preferably is detachably ecured to the split portion of the auxiliary hollow liston rod by means which contract the said split >ortion onto the hollow piston rod proper, thus ecuring the two together. Other means however, nay be provided for adjustably securing the anlular collar or sleeve to the hollow piston rod.

The hollow piston rod extends beyond the auxliary piston rod or collar to form a terminal onto which is connected flexible tubing or other device or delivering fluids from a suitable reservoir; 1O ;he reservoir in some cases may be directly connected to the said piston rod.

The end of the barrel has a metal plug fitted thereto which is channelled to hold an outlet valve which may be similar to the inlet valve previously 1 described, except that it enables the contents of the syringe to be discharged through the outlet channel which is continued through the outer end cap into a nipple screwed or otherwise fitted into the cap, and designed to take the hypodermic needle or drenching nozzle.

In order that the invention may be more readily understood and carried into practical effect, reference will now be made to the drawing, which illustrates one form of the invention, wherein:Figure 1 is an elevation of the syringe while Figure 2 is a longitudinal cross section of Figure 1.

Referring to the drawing, the protecting sheath or barrel 3 is preferably of metal, but may be of any other suitable material, and encloses a barrel 4 of glass or other suitable transparent material, and which is graduated to indicate the amount of fluid constituting a charge or dose.

The barrel 3 is fitted with a screw cap 5 of metal which is designed to permit of visibility of the contents of the glass barrel 4 while a fixed or adjustable grip 6 of metal is provided on the barrel 3 in a convenient position for the hand of the operator.

A piston or plunger I of metal or other suitable material is accurately fitted into the glass barrel 4 and carries an inlet valve consisting of a ball 8 and a spring 9, said ball 8 fitting accurately into a prepared seat 10 in the piston or plunger 1.

From this inlet valve in the piston 1 a channel 11 is constructed to communicate with the interior of the glass barrel 4 thus allowing the fluid or other substance to pass therethrough into the said glass barrel 4 of the syringe.

Fitted to the top of the piston or plunger 7 is a hollow piston rod 12 which extends through the metal screw cap 5 on the barrel 3 of the syringe.

The hollow piston rod 12 is preferably graduated and mounted concentrically thereon is an auxiliary hollow piston rod 13 also extending through 56 the cap 5, said auxiliary hollow piston rod 13 being split longitudinally at 14 through half or more than half its length.

The auxiliary hollow piston rod 13 has an 6 annular collar 15 at the inner extremity thereof bearing against the inner face of the cap 5 and serving as a stop for the hollow piston rod 12 when drawn back to its normal position automatically under the influence of a spring 16 fitted around the auxiliary hollow piston rod 13 and which charges the glass barrel 4 in readiness for a subsequent injection or discharge.

A movable handpiece 17 adapted to actuate the piston 7 through members 12 and 13 is attached 16 to the auxiliary hollow piston rod 13 for instance by a suitable bolt or stud 18.

This bolt or stud 18 when screwed down tightly, contracts the split portion 14 of the auxiliary hollow piston rod 13 and clamps the said auxiliary hollow piston rod 13 to the hollow piston rod 12.

The hollow piston rod 12 is prolonged to form a terminal 19 onto which is connected flexible tubing (not shown) or any other suitable device 21 for delivering fluids from a reservoir.

Fitted into the end of the metal barrel 3 is a plug 20 channelled to hold an outlet valve 21 similar to the inlet valve 8; this valve enables the ,contents of the syringe to be emitted through an in outlet channel 22 which is formed in a hollow projection or nipple 23 adapted to receive a hypodermic needle 24 or drenching nozzle as the case may be.

When it is desired to regulate the amount of dosage in the glass barrel 4 the adjusting bolt 18 is slackened relieving the pressure of the split portion 14 of the auxiliary hollow piston rod 13 on the hollow piston rod 12 with the result that the relative position of the piston rod and the auxiliary rod may be varied, and the piston 7 adjusted to any position in the glass barrel 4 according to the requirements of the operator.

I claim: A hypodermic syringe and drencher comprising a barrel of glass or other suitable material, a metal sheath housing the barrel, a piston in the barrel having an inlet valve, said barrel also having a discharge valve, a hollow piston rod attached to the piston and through which fluid is fed to the barrel, and tubular means concentric with the piston rod for determining the stroke of "!o the piston, said tubular means having a collar at one end for engagement with an end cap disposed on the said sheath, the other end of the tubular means being split longitudinally and having means thereon for adjustably securing together the sleeve and the hollow piston rod, said split end of the hollow means having a handle secured thereto said handle serving to clamp the tubular means to the hollow piston rod.

ANGUS CONRAD M30 ANGUS CONRAD McKAY.