US1648135A - Syringe - Google Patents

Description

Nav. s, 192,7.

R. E. KLETT SYRINGE Filed Aug. 16, 1923 IN VEN TOR m."

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AToRNEY 'u airis y rar ROBERT E. KLETT, os anearrnnnmarz, new? `assi-snortro 'nr-ETT Manej- FACTURING COMPANY; me., or New Yoan; N.' A'coaronamron or Nswyoam emmen..

' i Apinication med August 16,. ieee.; serial Nei 55mm-g wf This invention relates to syringes such as are used for hypodermic injections, andother similar devices which require sterilization. Difficulty has beenexperienced in obtaining a suitable piston and end plug for such syringes. Metal is subject to excessive wear under pro-longed use, and if combined with a glass cylinder is liable to stick, or break the glass'if the syringe be sterilized without taking it apart. .Glass and porcelain are not convenient because these substances are not capable of receiving screw threads by means of 4which the piston rod orv other member may be connected, and are also too brittle.

An object of this invention is to provide a hard, substantially heat-resisting, and nonexpansible material which may be us-ed within a glass or other syringe barrel and lpossess'a long life adapted to withstand hard wear, being not brittle and capable of having the syringe sterilized without the necessity of taking it apart.

The drawing shows a longitudinal section of this invention embodied in a syringe.V

The hypodermic needle 10 is supported by the metal end member 11 in the customary The barrel --13 of the syringe is preferably of ground glass and has the plug 15 of lava in one end thereof which plug is provided with screw threads 14 to engage the member 11 and as shown a flange 12 may engage the ends of the barrel. .Within the barrel is the piston 16 also of lava and having threaded engagement with the metal V member 17 which is connected to the piston rod 18 through the ball and socket/joint 19. Customary linger grips 2O are provided on the barrel of the syringe andv likewisethe usual support 21 for Vthe actuating thumb or finger. Surrounding the glassbarrel isthe vmetal casing 22 which is provided to safeguard the barrel and prevent breakage. The

metal casing is preferably open on opposite y glass barrel of a hard, substantially heatsides to permit transmission of light through the syringe and to enable graduations to be provided on the glassbarrel.

VThe lava of which end member 15 and piston 16V are constructed is not of volcanic origin but is the magnesia and talc compound met with in the electric arts asian insulating and heat resisting material lwhich is mined as a soft materialenabling it'to be machined or threaded as desired. A subsequent baking operation wherein the material from literature is subjected to a temperature of about 2,000o F. changes it into a very hard substance which though hard is not as brittle as. glass or porcelain. A more detailed description of this material and its characteristics may beV found on pages 81484 of a book entitled Common Materials published for Elec- Y 'trical Record by The Gage'Publishing Co.1

Inc., 114 Liberty Street, New York city, or

Lava Company.

published by the American' There are a number of'advantages ac-` cruing from making a piston or other memberinside a "syringe of lava.y This material is heat resistantv and because substantially non-expansible, it is possible to sterilize the syringe without taking it apart. .The lava being less brittle, yethard, and in its soft statebefore baking adapted to be machined, makes'this materialk better adapted forsuch usethan glass or porcelain because these materials cannot kbe satisfactorily threaded.v The lava d oesnot cut or scratch the walls of the glass 'barrel but instead, after pro- V f longed use, becomes polished. If metal pistons were used theywould be subject to the disadvantage of undue wear and expansion when heated during sterilization, requiring the demounting of the syringe when a metal piston is used. v

The lava'material is adapted for other locations than pistons and for vuse in other devices requiring sterilization 'than the syringe illustrated.

I claim: 1.,The combination with a barrehof a hard, substantially .heat-resistant, and noneXpans'ible piston therein less brittle than the barrel and adapted vto take a polish with use, anda piston rod secured to said piston. 2. The combination with a barrel, of a lava piston movable therein, and a piston rod secured to the piston.

3. In a syringe, the combination with a resistant and non-eXpansible piston therein capable oftaking ar polish on its periphery under prolonged use, and a piston rod vcontaeting with the inner Walle of said barrel. joint between said piston rod and member. 10

6. The combination with a glass barrel, .8@ The combination with a; barrel, of a of apiston therein composed of lava havlava piston therein, a piston rod, and a lava ing e polished surface eontaeting with the plug olosingran end of the barrel and having 5 barrel,` a piston rod, and a threaded cona hole therethrough. f nection between said piston and rod. Signed at New York city. in theA county 15 7. The combination with a glass barrel, of. 'of New York and State of New York, thisV a .lava piston therein, a member threaded to 14th day of August, A. D. 1923.

,f the piston, a piston rod, and a universal ROBERT E. KLETT.

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