Specification of James Darsie Morrison : production of anaesthesia.

  • Morrison, James Darsie.
Date:
1858
Catalogue details

Licence: Public Domain Mark

Credit: Specification of James Darsie Morrison : production of anaesthesia. Source: Wellcome Collection.

    9/16 (page 7)
    10 15 20 25 30 35 Specification. 7 A.D. 1857.—N° 3189. Morrisons Improvements in Producing Artificial Anaesthesia, <§x. end of each of the tubes 0 nearly to the part where the terminal tubes Q emerge. The effect of this is, that each tube 0 is divided into two channels, excepting at the part near the anterior portion of the tubes 0, where the diaphragm terminates, as shown by the dotted lines in the plan of the instrument, Figure 6. As the stream of liquid flows into each of the tubes 0 by the lateral tube U, it passes along one side of the diaphragm, round its anterior extremity, thence backward along the opposite side of the diaphragm, and out by the descending tube X. In this manner a constantly circulating current of fluid or gas is kept up during the time the instrument is in use. In applying this instrument to operations connected with dental surgery, it is intended to be used after the instrument herein-before described has been removed from the patient’s gum. The free extremities of the tubes Q are to be placed in contact or nearly so with the gum, and the stream of air allowed to flow through the holes in the same, the current of liquid being meanwhile circulated through the duplex channels of the tubes 0. The current of air passing through the apertures in the tubes Q, is sufficient to prevent the return of sensibility in the gum without interfering with the free use of the dental instrument; and when the dental operation is completed, the animal heat may, by means of the instrument, be gradually restored by artificial heat, in order to avoid injury to the organic tissues. It is preferred to make these instruments of gold, platinum, silver, or other metal having a limited affinity for oxygen, and advantage may be taken of this to convey by means of the instrument a stream of electricity to the affected part where such a course of treatment is deemed beneficial. In such cases the instruments may be readily made to form a portion of the electric circuit, by securing the terminal wires or chains thereto ; and in this manner either positive or negative electricity may be conveyed to or abstracted from the part of the body under operation. Figures 7 and 8 represent respectively an elevation and plan of a modified arrangement of apparatus for effecting the congelation of parts of the human body. In this modification there are two tubes a and h, arranged one above the other, as shown in the elevation, Figure 7 ; these tubes are soldered into the larger tubes c and d, the two being held together by the jointed clip e. This clip e is made so that the tubes held therein are readily altered as regards their relative position, that is to say, the curved extremity of one tube a or h may be advanced beyond or drawn behind the other, or turned aside from each other, as the operator requires. The joint of the clip e is furnished with a pin, which the operator can easily withdraw, so as to disconnect the one tube from the other at pleasure. The curved extremities of the tubes a and b have