Bloodletting Instruments in the National Museum of History and Technology

by Audrey B. Davis; Toby A. Appel

Veterinary Bloodletting

The same theories and practices that prevailed for human medicine were applied to the treatment of animals. Not only were horses routinely bled, they were also cupped and leeched.[195] Manuals of veterinary medicine gave instructions for the bleeding of horses, cows, sheep, pigs, dogs, and cats.[196]

There was one major difference between bleeding a man and bleeding a horse or cow, and that was the amount of strength required to open a vein. The considerable force needed to pierce the skin and the tunic of the blood vessel made the operation much more difficult to perform than human phlebotomy.[197] As in the case of cupping, the simplest instruments, those most often recommended by experts, were not easy to use by those without experience. Although a larger version of the thumb lancet was sometimes employed, most veterinarians opened the vein of a horse with a fleam, that is, an instrument in which the blade (commonly double beveled) was set at right angles to the blade stem. These are enlarged versions of the fleam employed in human bloodletting. The fleams sold in the eighteenth and nineteenth centuries consisted of one or more blades that folded out of a fitted brass shield. In the late nineteenth century fleams with horn shields were also sold. The largest blades were to be used to open the deeper veins and the smaller blades to open the more superficial veins.

To force the fleam into the vein, one employed a bloodstick, a stick 35-38 cm long and 2 cm in diameter. The blade was held against the vein and a blow was given to the back of the blade with the stick in such a way that the fleam penetrated but did not go through the vein. Immediately the fleam was removed and a jet of blood came forth that was caught and measured in a container. When enough blood had been collected, a needle would be placed in the vein to stop the bleeding.

Horses were most frequently bled from the jugular vein in the neck, but also from veins in the thigh, the fold at the junction of breast and forelegs, the spur, the foreleg, the palate, and the toe.

Since applying the bloodstick required a degree of skill, the Germans attempted to eliminate its use by adapting the spring lancet to veterinary medicine. The common veterinary spring lancet (which sometimes was also called a “fleam” or “phleme”) was nothing but an oversized version of the brass, nob end spring lancet used on humans. Sometimes the lancet was provided with a blade guard that served to regulate the amount of blade that penetrated the skin. Although the veterinary spring lancet was quite popular in some quarters, the French preferred the simple foldout fleam as a more convenient instrument.[198] (Figure [22].)

Figure 22.—Knob end spring lancet used on humans compared to a knob end lancet used on horses and cattle. Note the blade guard on the veterinary spring lancet. (NMHT 302606.09 and NMHT 218383 [M-9256]: SI photo 76-7757.)

In contrast to the few attempts made to modify the human spring lancet, there were a large number of attempts to modify the veterinary spring lancets. Veterinary spring lancets can be found with a wide assortment of shapes and a wide variety of spring mechanisms. In the enlarged knob end spring lancet, pushing upon the lever release simply sent the blade forward into the skin. By a more complex mechanism, the blade could be made to return after it was injected, or the blade could be made to sweep out a curve as do the blades of the scarificator. Perhaps one of the earliest attempts to introduce a more complex internal mechanism into the veterinary spring lancets is found in John Weiss’s “patent horse phlemes” of 1828. The first model invented by Weiss was constructed on the principle of the common fleam and bloodstick. As in the knob end spring lancet, the spring acted as a hammer to drive the blade forward. In a second improved “horse phleme,” Weiss mounted the blade on a pivot so that the blade swept out a semicircle when the spring was released.[199]

The Smithsonian collection contains a number of different types of veterinary spring lancets. Perhaps this variety can best be illustrated by looking at the two patent models in the collection. The first is an oval-shaped lancet patented in 1849 by Joseph Ives of Bristol, Connecticut.[200] By using a wheel and axle mechanism, Ives had the blade sweep out an eccentric curve. The lancet was set by a detachable key (Figure [23]).

The second patent lancet was even more singular in appearance, having the shape of a gun. This instrument, patented by Hermann Reinhold and August Schreiber of Davenport, Iowa, in 1880, featured a cocking lever that extended to form a coiled spring in the handle portion of the gun. Also attached to the cocking lever was an extended blade with ratchet catches, so that by pulling on the cocking lever, the blade was brought inside the casing and the spring placed under tension. Pushing upon the trigger then shot the blade into the vein.[201] (Figure [24].)