Tube occluder and method for occluding collapsible tubes

• US 6,877,713 B1
• Filed: 07/20/1999
• Issued: 04/12/2005
• Est. Priority Date: 07/20/1999
• Status: Expired due to Term

• Current Assignee: Deka Products Limited Partnership
• Original Assignee: Deka Products Limited Partnership
• Inventors: Gray, Lawrence B., Lanigan, Richard J.
• Primary Examiner(s): KEASEL, ERIC S
• Application Number:
  US09/357,645
• Time in Patent Office: 2,093 Days
• Field of Search: 251/4, 251/5, 251/7, 251/58, 251/61, 251/61.1, 604/34, 604/249, 604/250
• US Class Current: 251/7
• CPC Class Codes: A61M 1/1649 with pulsatile dialysis fluid flow
• CPC Class Codes: A61M 1/267 used for pumping
• CPC Class Codes: A61M 1/362227 the interface providing means for actuating on functional elements of the cassette, e.g. plungers
• CPC Class Codes: A61M 1/36225 with blood pumping means or components thereof
• CPC Class Codes: A61M 1/362261 at least one cassette surface or portion thereof being flexible, e.g. the cassette having a rigid base portion with preformed channels and being covered with a foil
• CPC Class Codes: A61M 1/362264 the filter being a blood filter
• CPC Class Codes: A61M 1/362265 Details of valves
• CPC Class Codes: A61M 1/362266 Means for adding solutions or substances to the blood
• CPC Class Codes: A61M 1/367 Circuit parts not covered by the preceding subgroups of group A61M1/3621
• CPC Class Codes: A61M 2205/12 with interchangeable cassettes forming partially or totally the fluid circuit
• CPC Class Codes: A61M 2209/02 Equipment for testing the apparatus
• CPC Class Codes: A61M 39/228 with a tubular diaphragm constrictable by radial fluid force
• CPC Class Codes: A61M 5/14 Infusion devices, e.g. infusing by gravity; Blood infusion; Accessories therefor
• CPC Class Codes: A61M 5/14224 Diaphragm type
• CPC Class Codes: A61M 5/14593 the diaphragm being actuated by fluid pressure
• CPC Class Codes: A61M 5/172 electrical or electronic A61M5/16804, A61M5/16831 take precedence
• CPC Class Codes: F04B 43/067 the fluid being actuated directly by a piston
• CPC Class Codes: F04B 45/00 Pumps or pumping installations having flexible working members and specially adapted for elastic fluids
• CPC Class Codes: F04B 45/02 having bellows
• CPC Class Codes: F04B 49/065 and making use of computers
• CPC Class Codes: F04B 49/12 : by varying the length of stroke of the working members
• CPC Class Codes: F04B 53/10 : Valves; Arrangement of valves
• CPC Class Codes: F04B 53/16 : Casings; Cylinders; Cylinder liners or heads; Fluid connections
• CPC Class Codes: G01M 3/26 : by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
• CPC Class Codes: G01M 3/32 : for containers, e.g. radiators
• CPC Class Codes: G05D 16/20 : characterised by the use of electric means

Abstract

The present invention involves, in some embodiments, mechanisms and methods of occluding collapsible tubing with an occluder to prevent fluid flow therethrough. In some embodiments, a tube occluding mechanism is disclosed that includes a bendable occluding member for creating a force that can be applied to a collapsible tube to occlude the tube. In some embodiments, the collapsible tube can be an inlet/outlet tube on a removable pumping cartridge that is coupled to a reusable pump drive component when the system is in operation. In such embodiments, the occluding mechanism can be attached to the reusable component and can be used to block fluid flow to and from the pumping cartridge. In some embodiments, the occluding member can comprises a spring plate which can create a force to occlude tubing when in a relaxed, unbent configuration, and which can be bent to unocclude the tubing. In some preferred embodiments, in a default configuration of the tube occluder mechanism (when no external force is applied to the occluding member) the tubes are occluded, so that the tube occluder mechanism provides a fail-safe configuration preventing fluid flow to and from a pumping cartridge to which the tubes can be connected.

Claims

1. An occluder for occluding at least one collapsible tube comprising:

an occluding member; and

a force actuator constructed and positioned to bend the occluding member from a first configuration to a second configuration, the occluding member in the first configuration being essentially non-compliant to forces applied to the occluding member along at least one direction and the occluding member in the second configuration being compliant with respect to said forces;

wherein at least one end of the occluding member is pivotally attached to a support structure;

wherein two ends of the occluding member are pivotally attached to the support structure, and wherein the force actuator is constructed and positioned to apply a force to a surface of the occluding member such that the force is applied at at least one point intermediate said two ends;

wherein one of said two ends is pivotally and slidably connected with an occluder blade that is constructed and positioned to occlude the collapsible tube when the occluding member is not subjected to a bending force, and to open the tube allowing fluid flow therethrough when the occluding member is subjected to a bending force.

2. The occluder of claim 1, wherein upon the occluding member being subjected to a bending force, the occluder blade moves away from contact with said tube in a direction essentially parallel with a longitudinal direction of the occluding member before bending.

3. An occluder for occluding at least one collapsible tube comprising:

an occluding member; and

a force actuator constructed and positioned to bend the occluding member from a first configuration to a second configuration, the occluding member in the first configuration being essentially non-compliant to forces applied to the occluding member along at least one direction and the occluding member in the second configuration being compliant with respect to said forces;

wherein said occluding member is oriented with a longitudinal axis that is essentially perpendicular to a wall of a tube to be occluded.

4. A method for occluding at least one collapsible tube, the method comprising:

applying a force to bend an occluding member in order to open said collapsible tube to enable fluid flow therethrough; and

releasing said force to relax the occluding member and occlude the collapsible tube.

5. The method of claim 4, wherein in the applying step, said force is applied in a direction essentially perpendicular to a surface of said occluding member.

6. The method of claim 4, wherein the applying step comprises applying said force to a spring plate comprising said occluding member.

7. The method of claim 4, wherein the applying step comprises inflating a bladder disposed adjacent to a surface of said occluding member with a pressurized fluid.

8. The method of claim 4, further comprising the steps of coupling a pumping cartridge including said collapsible tube to a reusable component including said occluding member.

9. An occluder for occluding at least one collapsible tube comprising:

an occluding member; and

a force actuator constructed and positioned to apply a force to the occluding member to bend the occluding member from an occluding configuration to an open configuration.

10. The occluder of claim 9, wherein the force actuator is constructed and positioned to apply a force directly to the occluding member.

11. The occluder of claim 9, wherein the occluding member is constructed and positioned so that it is resistant to forces applied from the tube to bend the occluding member from the occluding configuration to the open configuration.

12. An occluder for occluding at least one collapsible tube comprising:

an occluding member having, in a first configuration, a substantially linear longitudinal axis; and

a force actuator constructed and positioned to apply a force to the occluding member to bend the occluding member into a second configuration having a non-linear longitudinal axis.

13. The occluder of claim 12, wherein the force actuator is constructed and positioned to apply a force directly to the occluding member.

14. An occluder for occluding at least one collapsible tube comprising:

an occluding member; and

a force actuator constructed and positioned to disrupt column stability of the occluding member and bend the occluding member.

15. An occluder for occluding at least one collapsible tube comprising:

an occluding member changeable between an occluding configuration, in which the tube is occluded, and an open configuration, the occluding member being constructed and positioned so that it is most resistant to forces applied from the tube to change the occluding member from the occluding configuration to the open configuration when the occluding member is in the occluding configuration.