Fluid processing cassette and sensor coupling system and method

Patent metadata

Field	Value
Publication number	US-10413653-B2
Application number	US-201715472546-A
Country	US
Kind code	B2
Filing date	Mar 29, 2017
Priority date	Apr 8, 2016
Publication date	Sep 17, 2019
Grant date	Sep 17, 2019

Abstract

A fluid processing cassette and sensor coupling system is disclosed, comprising a cassette comprising a cap having an opening formed by an inner cylindrical wall having a first diameter, an outer cylindrical wall having a second diameter, and a contact surface connecting the inner and outer cylindrical walls. The contact surface includes a varying diameter that decreases from the second diameter to the first diameter. A sensor post comprises a ring disposed around a cylindrical body and is positioned to engage with the contact surface of the cap to form a seal.

First claim

The invention claimed is:

1. A fluid processing system comprising:
a cassette comprising a molded body having a plurality of valve stations and at least one pressure sensing station, wherein the pressure sensing station comprises a cap having an opening extending beyond the molded body; and
a loading area configured to receive and hold the cassette, and configured to position the cassette onto a valve and sensor assembly, wherein the valve and sensor assembly comprises valve actuators and at least one pressure sensing transducer comprising a sensor post, the valve and sensor assembly configured to align respectively with the plurality of valve stations and the pressure sensing station;
wherein the opening of the cap is formed by an inner wall having a first diameter, an outer wall having a second diameter, and a contact surface connecting the inner and outer wall,
wherein the contact surface includes a varying diameter that decreases from the second diameter to the first diameter;
wherein the sensor post comprises a ring disposed around a cylindrical body and positioned to engage with the contact surface of the cap to form a seal; and
wherein the contact surface is disposed at an acute angle relative to a vertical axis of the seal, the acute angle having a value in the range of 30 to 60 degrees.

2. The system of claim 1 , wherein the pressure sensing transducer comprises at least one of a piezoelectric, bridge-based, capacitive, and optical mechanism.

3. The system of claim 1 , wherein the sensor post further comprises a bottom lip configured to contact and support the ring.

4. The system of claim 1 , wherein the sensor post further comprises a top lip having a diameter greater than a diameter of the cylindrical body.

5. The system of claim 4 , wherein the ring is compressed between the contact surface and the sensor post.

6. The system of claim 1 , wherein the ring comprises at least one of silicone, nitrile rubber, and a fluoropolymer elastomer, and comprises a hardness value in the range of 20 to 100 durometers.

7. The system of claim 1 , wherein the ring is configured to exert a force against the cap at an acute angle relative to a vertical axis of the seal.

8. A fluid processing cassette and sensor coupling system comprising:
a cassette comprising a cap having an opening formed by an inner cylindrical wall having a first diameter, an outer cylindrical wall having a second diameter, and a contact surface connecting the inner and outer cylindrical walls, wherein the contact surface includes a varying diameter that decreases from the second diameter to the first diameter; and
a sensor post comprising a ring disposed around a cylindrical body and positioned to engage with the contact surface of the cap to form a seal, wherein the contact surface is disposed at an acute angle relative to a vertical axis of the seal, the acute angle having a value in the range of 30-60 degrees.

9. The system of claim 8 , wherein the sensor post further comprises a bottom lip configured to contact and support the ring.

10. The system of claim 8 , wherein the sensor post further comprises a top lip having a diameter greater than a diameter of the cylindrical body.

11. The system of claim 10 , wherein the ring is compressed between the contact surface and the sensor post.

12. The system of claim 8 , wherein the ring comprises at least one of silicone, nitrile rubber, and a fluoropolymer elastomer, and comprises a hardness value in the range of 20 to 100 durometers.

13. The system of claim 8 , wherein the ring is configured to exert a force against the cap at an acute angle relative to a vertical axis of the seal.

Assignees

• Fenwal Inc

Inventors

• Case Brian C
• West Richard L
• Murphey Randy K
• Bishof Christopher J

Classifications

• A61M2205/121

  interface between cassette and base · CPC title

• A61M2209/084

  Supporting bases, stands for equipment · CPC title

• A61M1/3639 Primary

  Blood pressure control, pressure transducers specially adapted therefor · CPC title

• A61M2205/12

  with interchangeable cassettes forming partially or totally the fluid circuit · CPC title

• A61M2205/3327

  Measuring · CPC title