US551973A - Syringe - Google Patents

Description

(No Model.)

W.YH. KNAP.l

SYRINGE.

Patented Dec. 24, 1895.

- UNrTED Samarasy PATENT FFICE.

WILLIAM H. KNAP, OF CHICAGO, ILLINOIS. y

SYRINGE.

'SPECIFICATION forming part of Letters Patent No. 551,973, dated December 24, 1895.

application ma october 2, 189s.

Serial No. 486,942. (No model.)

To a/ZZ whowt t may concern:

Be it known that I, VILLIAM H. KNAP, a citizen of the United States of America, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements inVaginal Syringes, of which the following is a specification.

My invention relates to improvements in vaginal syringes, its object being to provide a syringe simple in construction, convenient in operation, capable of being readily cleaned, and adapted to be used for every purpose ofv such an instrument, and particularly in the injection of hot liquids.

The invention is fully described and eX- plained in this specification and shown in the accompanying drawings, in which- Figure l is a side elevation of a syringe embodying my invention, and Fig. 2 is a central longitudinal section thereof.

In the views, A A' A2 are the walls of the hollow conoidal body of the syringe, the outer wall A being a frustum of a cone flaring outward at its larger base, the inner wallA' being a cylindrical tube of the same diameter as is the smaller end of the frustum, and the wall A2 being a plane annular plate joining the corresponding ends of the walls A A'. The three walls A A' A2 include a closed airspace interposed between the walls A` A2 and insulating the outer wall against heat applied to the inner. p

About the opening in the base A2 is a projecting cylindrical tube A3, forming practically an extension of the inner wall A'. This tube is externally screw-threaded and receives an internally-threaded cylinder B, having a terminal cap B', in which is set a longitudinally-adjustable tube C coincident with the axis of the syringe. One end C' of the tube projects beyond the smaller end of the body, and is rounded and perforated for the discharge of liquids. The other end C2 projects from the cap B', and is so shaped as to readily receive the end of a rubber tube D, connected with a reservoir R or other source of supply of liquids. A discharge-tube C3 is set in the cylindrical wall B, and forms an outlet from the space about the tube C. The outer end of the discharge-tube is shaped like that of vbody being adapted to permit its insertion a sufficient distance for the effective use of the instrument. Liquid passing along the rubber tube D from the source of supply enters through the tube C and is discharged through its perforated end C', and thus reaches the surfaces to be treated. As fast as the liquid enters through the tube C, it escapes throughl the space about it and passes through the discharge-tube C3 and rubber tube D'. In the insertion of the syringe and during its use the projecting cylinder B serves as a handle by whichl the syringe may be securely held, and it also forms a part of the channel by which the liquid reaches the discharge-tube C3. Furthermore the placing of the dischargetube in the side wall of this projection renders it possible to bring the discharge-tube into a downwardly-pointing vertical position when the syringe is in use, and thereby facilitates the perfect drainage of the syringe.

It is frequently desirable to use a syringe of this class for the injection of liquids heated to a high temperature, and it is extremely desirable in such uses to prevent as far as possible the heating of the outer surface of the body of the syringe, since the surfaces intended to be reached by the heated liquid are much less sensitive to heat than those in contact With the body of the syringe. It is for this reason that the body is made hollow, as shown in the drawings, and is also preferably formed of hard rubber or other similar material which is a poor conductor of heat. Actual experience shows that a syringe formed as shown in the drawings and made of hard rubber may be used for any necessary length of time in the injection of liquids at the highest desirable temperature without becoming inconveniently hot.

It will be observed that the parts of the syringe may be readily separated for the purpose of cleaning them, and I consider it suffi! IOO on the neck, A3, sind having tbe lateral dise charge-tube, C3, and* the induction tube, C, extending through the cap, B, B', and the space Within thebody, said induction tube being longitudinally adjustable Within the body and being formed With discharge openings at one end,and adapted to receive a supply tube at the opposite end, substantially es shown and described.v i

WILLIAM Il. KNAI".`

Witnesses CHARLES O. SHERVEY, N. ARoenns.

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