US 12,220,506 B2
Breast pump
Yukifumi Ochiai, Tokyo (JP); and Sumiko Kuroishi, Tokyo (JP)
Assigned to PIGEON CORPORATION, Tokyo (JP)
Appl. No. 15/734,333
Filed by PIGEON CORPORATION, Tokyo (JP)
PCT Filed Jun. 3, 2019, PCT No. PCT/JP2019/022015
§ 371(c)(1), (2) Date Dec. 2, 2020,
PCT Pub. No. WO2019/235432, PCT Pub. Date Dec. 12, 2019.
Claims priority of application No. 2018-107991 (JP), filed on Jun. 5, 2018.
Prior Publication US 2021/0220535 A1, Jul. 22, 2021
Int. Cl. A61M 1/06 (2006.01)
CPC A61M 1/064 (2014.02) [A61M 1/06 (2013.01); A61M 1/0697 (2021.05)] 16 Claims
OG exemplary drawing
 
1. A breast pump, comprising:
a breast pump main body generating a negative pressure for pumping;
a hood connected to the breast pump main body and placed onto a breast; and
a buffer portion having a ring shape and mounted detachably to the hood, the buffer portion being made of a material softer than a material of the hood and having elasticity, wherein
the hood includes:
a flow path portion that has a cylindrical shape of which an inner diameter is substantially consistent, and is connected to the breast pump main body and through which breast milk extracted from the breast passes; and
a diameter expansion portion that has
a corn shape of which a tip of the corn shape is cut off such that a circular hole is formed with a top edge wherein a diameter of the circular hole is the same as the inner diameter of the flow path portion, the top edge is connected to the flow path portion, and a boundary where the diameter expansion portion and the flow path portion are connected is defined as a boundary portion, and
an inner diameter expanding from the top edge as approaching toward a bottom edge, which is opposite to the top edge, and
is configured to be placed onto the breast;
the buffer portion is configured with
a bonding portion that is provided at one end of the buffer portion and fitted to the edge portion; and
a sealing portion that is provided on a side of the buffer portion opposite to the bonding portion and of which outer surface comes into close contact with an inner surface of the diameter expansion portion for sealing, wherein a leading edge of the sealing portion directing toward the flow path portion does not reach the boundary portion.