Medical liquid-pressure-detecting device

Patent metadata

Field	Value
Publication number	US-10775252-B2
Application number	US-201715823794-A
Country	US
Kind code	B2
Filing date	Nov 28, 2017
Priority date	Jun 1, 2015
Publication date	Sep 15, 2020
Grant date	Sep 15, 2020

Abstract

A medical liquid-pressure-detecting device capable of detecting both the negative and positive pressure of liquid, whereby the misconnection of the device to a liquid flow route can be prevented. A medical liquid-pressure-detecting device includes a chamber unit having an inlet that liquid flowing in a flow route is taken in and an outlet that the liquid is discharged, the chamber unit storing the liquid by a predetermined amount; and a diaphragm dividing the chamber unit into a liquid chamber and a gas chamber, the diaphragm being deformable in accordance with a pressure of the liquid, the medical liquid-pressure-detecting device detecting a pressure of liquid in the flow route on the basis of a change in the pressure in the gas chamber that is caused by the deformation of the diaphragm that includes a negative-pressure-detecting region that deforms toward one side when a negative pressure is generated in the liquid stored in the liquid chamber, and a positive-pressure-detecting region that deforms toward an other side when a positive pressure is generated in the liquid chamber.

First claim

The invention claimed is:

1. A medical liquid-pressure-detecting device comprising:
a chamber unit connected to a liquid flow route and having:
an inlet from which liquid flowing in the flow route is taken in and
an outlet from which the liquid is discharged, the chamber unit being capable of storing the liquid by a predetermined amount while the liquid flows from the inlet to the outlet; and

a diaphragm dividing an inside of the chamber unit into a liquid chamber that stores the liquid and a gas chamber that stores a predetermined gas, the diaphragm being deformable in accordance with a pressure of the liquid in the liquid chamber,
the medical liquid-pressure-detecting device being capable of detecting a pressure of the liquid in the flow route on a basis of a change in the pressure in the gas chamber that is caused by the deformation of the diaphragm,
wherein the diaphragm includes:
a negative-pressure-detecting region that deforms toward one side when a negative pressure is generated in the liquid stored in the liquid chamber, and
a positive-pressure-detecting region that has a region projecting upward at a center of the diaphragm and is positioned below a center of a swirl of the liquid that is generated when the liquid flows from the inlet to the outlet and the positive-pressure-detecting region deforms toward an other side when a positive pressure is generated in the liquid stored in the liquid chamber; and

wherein the outlet is provided at a top of the liquid chamber of the chamber unit and at a center position in a widthwise direction, and the inlet is provided at a position of the liquid chamber that is lower than the outlet is shifted from a center position in the widthwise direction by a predetermined length; and
wherein the liquid introduced from the inlet flows upward while forming the swirl and is discharged from the outlet.

2. The medical liquid-pressure-detecting device according to claim 1 , wherein the positive-pressure-detecting region is a central region of the diaphragm that projects toward the liquid chamber, and the negative-pressure-detecting region is a region of the diaphragm that projects toward the gas chamber between a peripheral edge and the positive-pressure-detecting region.

3. The medical liquid-pressure-detecting device according to claim 2 , wherein the negative-pressure-detecting region and the positive-pressure-detecting region each form an arc shape projecting downward or an arc shape projecting upward and are gently continuous with each other.

4. The medical liquid-pressure-detecting device according to claim 3 , wherein the chamber unit has a spherical shape, and the negative-pressure-detecting region and the positive-pressure-detecting region come into close contact with an inner wall of the chamber unit when a negative pressure or a positive pressure that is greater than predetermined is generated in the liquid stored in the liquid chamber.

5. The medical liquid-pressure-detecting device according to claim 4 , wherein the diaphragm when deformed by a negative pressure in the liquid chamber extends over the inlet, and the liquid introduced from the inlet flows upward while forming the swirl and is discharged from the outlet when the inlet is not covered by the diaphragm.

6. The medical liquid-pressure-detecting device according to claim 1 , wherein the negative-pressure-detecting region and the positive-pressure-detecting region have a substantially uniform thickness.

7. The medical liquid-pressure-detecting device according to claim 1 , wherein the chamber unit includes a connecting portion that is connectable to a sensor unit for detecting a change in a pressure of the gas stored in the gas chamber, and the connecting portion includes a sealing member that seals a connected portion of the sensor unit and into which the connected portion is fittable, and a communication hole into which the connected portion is insertable.

8. The medical liquid-pressure-detecting device according to claim 7 , wherein the sensor unit communicates with the gas chamber of the chamber unit through the connecting portion so that the sensor unit is capable of detecting a change in pressure of gas stored in the gas chamber.

9. The medical liquid-pressure-detecting device according to claim 7 , wherein the chamber unit includes a stay that secures the sensor unit and the connected portion at a predetermined position of a blood purification apparatus, and the senor unit includes a wall portion that covers and protects an outer periphery of the connected portion.

10. A liquid flow route to which the medical liquid-pressure-detecting device according to claim 1 is connected.

11. A medical apparatus comprising the liquid flow route according to claim 10 .

12. The medical liquid-pressure-detecting device according to claim 1 , wherein the positive-pressure-detecting region and the negative-pressure-detecting region are continuous from the center towards a peripheral edge of the diaphragm.

13. The medical liquid-pressure-detecting device according to claim 1 , wherein the diaphragm is made of a soft air-permeable material.

14. The medical liquid-pressure-detecting device according to claim 1 , wherein the diaphragm is made of silicon, styrene-ethylene-butylene-styrene (SEBS), or isoprene.

15. The medical liquid-pressure-detecting device according to claim 1 , wherein the negative-pressure-detecting region and the positive-pressure-detecting region come into close contact with an inner wall of the chamber unit when a negative pressure or a positive pressure respectively is generated due to a spherical shape of the chamber unit.

16. A medical liquid-pressure-detecting device comprising:
a chamber unit connected to a liquid flow route and having:
an inlet from which liquid flowing in the flow route is taken in and
an outlet from which the liquid is discharged, the chamber unit being capable of storing the liquid by a predetermined amount while the liquid flows from the inlet to the outlet; and

a diaphragm dividing an inside of the chamber unit into a liquid chamber that stores the liquid and a gas chamber that stores a predetermined gas, the diaphragm being deformable in accordance with a pressure of the liquid in the liquid chamber,
the medical liquid-pressure-detecting device being capable of detecting a pressure of the liquid in the flow route on a basis of a change in the pressure in the gas chamber that is caused by the deformation of the diaphragm,
wherein the diaphragm includes:
a negative-pressure-detecting region that deforms toward one side when a negative pressure is generated in the liquid stored in the liquid chamber, and
a positive-pressure-detecting region that has a region projecting upward at a center of the diaphragm and is positioned below a center of a swirl of the liquid that is generated when the liquid flows from the inlet to the outlet and the positive-pressure-detecting region deforms toward an other side when a positive pressure is generated in the liquid stored in the liquid chamber; and

wherein the outlet is provided at a top of the liquid chamber of the chamber unit and at a center position in a widthwise direction, and the inlet is provided at a position of the liquid chamber that is lower than the outlet is shifted from a center position in the widthwise direction by a predetermined length; and
wherein the diaphragm when deformed by a negative pressure in the liquid chamber extends over the inlet.

17. The medical liquid-pressure-detecting device according to claim 16 , wherein the liquid introduced from the inlet fl

Assignees

• Nikkiso Co Ltd

Inventors

• Funamura Shigeaki
• Mochizuki Hiroaki

Classifications

• A61B5/6866 Primary

  Extracorporeal blood circuits, e.g. dialysis circuits · CPC title

• G01L19/0046

  using isolation membranes (G01L13/026 and G01L19/0645 take precedence) · CPC title

• A61B5/021

  Measuring pressure in heart or blood vessels · CPC title

• A61M2205/3331

  Pressure; Flow · CPC title

• A61M1/3641

  Pressure isolators · CPC title