An appeal to the medical profession, on the utility of the improved patent syringe, with directions for its several uses, shewing ... the validity of the ... claims of the patentee / [John Read].

  • Read, John, 1760-1847
Date:
[1825?]
Catalogue details

Licence: Public Domain Mark

Credit: An appeal to the medical profession, on the utility of the improved patent syringe, with directions for its several uses, shewing ... the validity of the ... claims of the patentee / [John Read]. Source: Wellcome Collection.

    18/36 (page 16)
    to the stomach. Within this opening is a chamber contain¬ ing a spherical valve, which, by rising into the upper part of the chamber, where a vacuum is formed by elevating* the pis¬ ton, admits the atmosphere (or whatever it may be desirable to operate upon) to pass freely into the Syringe, but as soon as the piston is depressed, the contents of the Syringe presses the valve close upon the aperture, and prevents its escape through the opening by which it was received. To give exit to the contents of the Syringe, a side branch is constructed, furnished with a valved chamber, similar to the one above described, but so placed as to act in direct opposition to it, so that when the Syringe has been filled from the extremity, and pressure is made by depressing the piston, the fluid closes the lower valve, and opens the late¬ ral one, and consequently escapes through the latter aperture. To facilitate the operation of the instrument, a small pipe communicates with the upper extremity of the Syringe, which gives free ingress and egress to the atmos¬ phere during the action of the piston, a circumstance essen¬ tially necessary in causing the instrument to work easily and perfectly.* With this description every one will readily identify the instrument and prevent imposition being practised. I cannot more clearly represent the motive with which the stop-cock Syringe is opposed to mine, under the name and apparent sanction of Mr. Jukes, than by inserting the follow¬ ing letter from this gentleman; by which I shall at once strip off the cloak that covers these transactions and show them * in their true colours. * The Royal Arms and the Patentee’s name are engraved on the Syringe, without which none are genuine.