US 12,257,120 B2
Multi port irrigation needle
Vincent W. Shotton, Broken Arrow, OK (US); and Kevin L. Wilkinson, Bixby, OK (US)
Assigned to Dentsply Sirona Inc., York, PA (US)
Filed by DENTSPLY SIRONA Inc., York, PA (US)
Filed on May 31, 2019, as Appl. No. 16/427,960.
Claims priority of provisional application 62/679,064, filed on Jun. 1, 2018.
Prior Publication US 2019/0365504 A1, Dec. 5, 2019
Int. Cl. A61C 5/40 (2017.01); A61C 5/50 (2017.01); A61C 17/02 (2006.01)
CPC A61C 5/40 (2017.02) [A61C 5/50 (2017.02); A61C 17/0208 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A dental irrigation needle for irrigating a shaped root canal comprising:
a connection adapted to engage a syringe;
an internal fluid delivery conduit configured to contain an irrigation fluid, the internal fluid delivery conduit including a tapered portion; and
a plurality of exit ports for spouting irrigation fluid from the internal fluid delivery conduit,
wherein the plurality of exit ports includes at least a coronal/mid root exit port located near a mid-portion of the tapered portion having a first size opening and an apical exit port located near a distal end portion of the tapered portion having a second size opening different than the first size opening, wherein an irrigation fluid velocity at the coronal/mid root exit port and at the apical exit port is proportional to a cross section area of the internal fluid delivery conduit at the apical exit port and the cross section area of an opening of the apical exit port multiplied by the irrigation fluid velocity at a cross section area of the internal fluid delivery conduit at the apical exit port;
wherein the first size opening is smaller than the second size opening;
and wherein at least one of the plurality of exit ports is configured such that when the irrigation flow rate is about 15 milliliters per minute, (i) the pressure and velocity of the irrigation fluid at the coronal/mid root port are about 110 kPa and 2.94 m/s respectively and (ii) the pressure and velocity of the irrigation fluid exiting the apical exit port are about 100 kPa and 2.88 m/s respectively.