NPWHF0758 - Box of Hypodermic Needles

a) Bone Marrow biopsy trephine: needle like instrument for obtaining bone marrow samples (eg Leucaemia) hollow with slightly bevelled tip sharpened for cutting into bone (usually the sternum) At the operator end instrument has a thicker  section with cross hatching for grip by the operator . An obturator is inserted from the grip and passes the length of the trephine. The trephine has a movable and removable stop secured at the desired point on the shaft by a screw to limit the depth that the trephine could be inserted below the skin. In use this trephine with obturator in situ was inserted through a small nick in the skin (anaesthesised) over the bone sample area , usually sternum, and by back and forth rotation at the grip drilled into the bone. depth limited by the stop. Once the operator determined the trephine tip was positioned in the bone marrow cavity ( trial & error technique) the obturator wasa removed and replaced by a syringe to aspirate the bone marrow sample. Only a tiny amount of bone marrow could be aspirated by this technique, enough for a microscope slide for diagnostic purposes.

b) Leur Lock 24 guage hypodermic needle. The leur lock hub system was one of two systems commonly used to attach the needle to a syringe. The leur lock is a flanged square end on the needle hub which married with a complimentary part one the delivery end of a syringe. The needle hub was locked on to the syringe with a quarter turn of the needle ( The alternative system (known as the Record system) was to just push the needle hub (female) on to a straight (male) delivery end of a syringe. Modern disposable needles and syringes all adopt the Record system of needle attachment. 

c) Shaft Leur lock 19 guage hypodermic needle

d) Shaft Leur lock 14 guage hypodermic needle. Its length and guage suggest this was likely to be used as an airway inserted into a small bottle of intravenous fluid (say serum) to vent air from the bottle allowing free flow of I.V. fluid down the "drip"tubing to the patient. 

e) Shaft 14 guage rounded tapered end from which projects a 22 guage sharpened bevil ended needle. The needle point is protected by a fine plastic tube and the patiency of the needle cavity is maintained (when not in use) by a wire obdurator. This is a specialty intravenous delivery canula probably used by inserting into an exposed vein (cut down) rather than inserted through the skin. Tiny guage of the delivery needle suggests this was a special purpose ( not known) IV delivery system. 

f) Blue box to contain surgical hypodermic needles probably dental needles and not associated with the needles a-e.

Object ID: NPWHF0758 - Box of Hypodermic Needles

Materials: chrome steel , box cardboard, paper, cotton wool

Dimensions: a) L 50 mm D 1.2 mm b) L 25 mm c) L 50 mm d) 100 mm e) L 90 mm Needle 20 mm sticking out of the end. f) box 55 mm X 70 mm X 19 mm

Maker: needles unknown box Everett Co.