US 11,951,286 B2
Automatic injection device for fluid
Li-Wei Chen, Suao Township, Yilan County (TW); and Cole Krebs, Suao Township, Yilan County (TW)
Assigned to BANZA STAMPING INDUSTRY CORP., Suao Township (TW)
Filed by BANZA STAMPING INDUSTRY CORP., Suao Township, Yilan County (TW)
Filed on Dec. 25, 2020, as Appl. No. 17/134,239.
Application 17/134,239 is a continuation in part of application No. 16/005,885, filed on Jun. 12, 2018, granted, now 10,905,830.
Prior Publication US 2021/0113767 A1, Apr. 22, 2021
Int. Cl. A61M 5/20 (2006.01); A61M 5/31 (2006.01); A61M 5/315 (2006.01); A61M 5/32 (2006.01)
CPC A61M 5/2033 (2013.01) [A61M 5/31513 (2013.01); A61M 5/3129 (2013.01); A61M 5/3202 (2013.01)] 19 Claims
OG exemplary drawing
 
1. An automatic injection device for fluid comprising:
a hollow sleeve and having
a first end opening;
a second end opening; and
a cap mounted on the first end opening;
a barrel selectively held on the second end opening of the sleeve and having
a body having a first end opening and a second end;
a side hole formed transversely through the body of the barrel;
a piercing needle attached to the second end of the body;
an actuating unit mounted slidably in the barrel and having
an actuating washer mounted slidably through the side hole of the barrel and having
a distal end;
a proximal end; and
a through hole formed through the actuating washer, located in the sleeve and having a larger part near the distal end of the actuating washer and a smaller part near the proximal end of the actuating washer;
a resisting resilient element clamped between an inside wall of the body of the barrel and the proximal end of the actuating washer; and
an actuating resilient element mounted in the sleeve and pressed against the cap;
a high-pressure air source mounted slidably in the body of the barrel, selectively blocked by the actuating unit, selectively actuated by the actuating unit to slide toward the second end of the barrel to hit the piercing needle, and having a body and a neck, wherein an outer diameter of the neck is smaller than an outer diameter of the body, the outer diameter of the neck is larger than the inner diameter of the smaller part and is smaller than the inner diameter of the larger part of the through hole of the actuating washer.