piece 160 protrudes a circular column 166 the circular column 166 has slits 168 down its sides at the top of circular column 160 is a ridge 170 that protrudes perpendicular and outward from column 166 ridge 170 has a slanted top column 160 with its slanted top ridge 170 is designed to snap into smaller opening 156 in the u shaped piece 154 column 166 is designed to form an axle within opening 156 the axle formed by column 166 enables pivotal piece 60 to pivot at the end of the pivotal piece 160 opposite the end with the gears 62 a flap 174 extends upward from the pivotal piece 160 this flap 174 when pressure is placed upon it will cause the pivotal piece 160 when it is in place on the constriction device 100 to pivot to the use either of the embodiments of the invention the intraosseous infusion device 14 is placed in the patient 39 s leg then one takes the constriction device 10 or 100 with the strap 12 and places it on the patient 39 s leg the strap 12 loosely in circles the patient 39 s leg the constricting device 10 or 100 and strap 12 are pulled up the leg to a position over top the intraosseous infusion device 14 the constricting device 10 or 100 is then lowered over the intraosseous infusion device 14 and the intraosseous infusion device 14 is placed through opening 52 or 152 the strap 12 is then tightened upon the patient 39 s leg in the first embodiment one than puts pressure on the ridge 64 of the second piece 60 pushing it under the l shaped overhangs 56 and.