AMERICAN INSTITUTE. 207 



Davidson's Self- Injecting Syringe. 

 C. H. Davidson & Co., Charlestown, Mass. 



The bulb a, and the tubes b and c, are made of vulcanized 

 rubber, and all the other parts of block tin. The valve boxes, d 

 and e, fixed in each end of the bulb, contain valves which open 

 inward and outward, or to and from the bulb respectively. The 

 suction pipe, c, is attached to the box, d, and its other extremity 

 is terminated by the end piece, f. The delivery pipe, b, is attached 

 to the box, e, and is terminated at its other extremity, so that 

 either the anal pipe, g, or the vaginal pipe, h, may be used. 



By introducing the extremity f of the suction pipe into the 

 enema, and by the alternate compression and expansion of the 

 bulb, a, any required amount may be administered without remov- 

 ing the instrument, which possesses the further advantages of 

 durability, portability, facilities for cleansing, and adaptation 

 to every use of an injecting syringe. The ease with which this 

 instrument can be managed, in any position of the body, by an 

 invalid, and its adaptation to those cases in which the injection 

 requires, for its efficient action, a level or an elevated position of 

 the pelvis, will, it is believed, recommend it to favorable notice. 



To those cases where patients cannot be moved without causing 

 them great pain, this instrument is peculiarly adapted, as its flex- 

 ibility and construction allows it to be used in any position of the 

 patient, instrument or vessel containing the enema. The strains 

 or wrenching, which cannot be avoided even by the most careful 

 operator when a rigid syringe is used, with the pain occasioned 

 thereby to the patient, are by the use of this instrument avoided . 



