Improvements to and relating to hypodermic syringes / [Louis Roussy].

  • Roussy, Louis.
Date:
1905
Catalogue details

Licence: Public Domain Mark

Credit: Improvements to and relating to hypodermic syringes / [Louis Roussy]. Source: Wellcome Collection.

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    A.D. 1904 Date of Application, 25th Nov., 1904 Complete Specification Left, 16th Mar., 1905—Accepted, 4th Mayt 1905 PROVISIONAL SPECIFICATION. Improvements in and relating to Hypodermic Syringes. I, Louis Roussy, Dentist, of 8 Rue St. Leger, Geneva, Switzerland, do hereby declare the nature of this invention to be as follows: — This invention consists of certain new and useful improvements in hypodermic f, syringes, and is more particularly intended for use by dentists. I am aware that several constructions of such syringes are already known and made use of, and the purpose of the present improvements is to do away with several objections which exist in similar devices now in use. One of these objections is that, according to the large diameter of the piston of the syringe it requires too great an effort to make the injection by the mere u action of one hand and that therefore it is necessary to use both hands. A further objection is the form of attachment of the tubular needle to the collar of the glass-syringe, which renders the syringes either very cumbersome or does not provide a sufficiently secure joint. Another objection is made to several of the well-known syringes of the afore- said class, because the same are not easily taken to pieces for cleaning purposes. Now the present invention does away with these objections by means of the following devices. The dimensions of the cylinder of the same are as follows; —The length of the stroke of the piston is made approximately 15 times the inner diameter of 2d the cylinder. The exertion necessary for pushing the piston to obtain a certain pressure, is four times less with the present syringe than with those actually in use. On the open or upper end of the glass-cylinder, which is provided with the usual glass-collar, there is fractionally adjusted a metallic sleeve provided with slots forming suitable claws on the same, wffiich securely grip the said 25 glass-tube; the said metallic sleeve is further provided with suitable hooks or arms intended to be seized by the fingers of the operator. The other end of the glass-cylinder, is provided with a collar, which on part of its length is cylindrical and externally screw-threaded and on the other part of said length is conical. 30 Upon the said collar there is firmly screwed a metallic sleeve which is internally screw-threaded and of a corresponding conical shape. The usual tubular needle is fixed to the said sleeve by any suitable means. The accompanying drawings show, by way of example, one form of con¬ struction of the said syringe. 35 Figure 1 is an elevation of the complete syringe: Figure 2 is a cross-section on the line A—B of the same: Figure 3 shows, on a larger scale and in longitudinal section the connection of the glass-cylinder with the needle-bearer. In several figures, the same letters of reference refer to the same portions. 40 The glass-cylinder a is made of such dimensions that the stroke of the piston h, that is to say the useful length of the cylinder, measures 15 or about 15 times the inner diameter of the said cylinder. The piston is preferably made of amianthas. On the said glass-cylinder a, which has a collar a1 there is frietionally 4r> adjusted a metallic sleeve c provided with several slots cl so as to' form a series [Price 8c?.]