Fluid delivery apparatus and associated method

• US 5,537,335 A
• Filed: 11/06/1995
• Issued: 07/16/1996
• Est. Priority Date: 11/01/1993
• Status: Expired due to Fees

• Current Assignee: University of Pittsburgh of The Commonwealth System of Higher Education
• Original Assignee: University of Pittsburgh of The Commonwealth System of Higher Education
• Inventors: Labadie, Robert F., Antaki, James F., Borovetz, Harvey S.
• Primary Examiner(s): Ramirez, Ellis B.
• Assistant Examiner(s): Assouad, Patrick J.
• Application Number:
  US08/554,109
• Time in Patent Office: 253 Days
• Field of Search: 364/510 B, 364/188, 364/571.01, 128/10,637, 128/680, 134/570, 210/136, 623/3, 137/7, 137/14, 137/82
• US Class Current: 702/100
• CPC Class Codes: A61F 2/2472 Devices for testing
• CPC Class Codes: G05D 16/2013 using throttling means as controlling means
• CPC Class Codes: Y10T 137/0352 Controlled by pressure

Abstract

A fluid delivery apparatus including a chamber for holding a conduit, such as a portion of a human vascular tissue, a fluid supply source for delivering a fluid into the conduit and a fluid pressure modulating device for modulating the fluid pressure supplied from the fluid source before the fluid enters the conduit. The modulating device produces a fluid having a desired pressure waveform for delivery to the conduit. The modulating device includes a microprocessor that digitizes the desired pressure waveform into a plurality of discrete digitized data points and stores a motion controller computer program. The modulating device further includes a motion controller which receives the digitized data points and the motion controller computer program and which at least partially restricts the delivery of the fluid to the conduit based on the digitized data points and the motion controller computer program to produce the desired pressure waveform for delivery to the conduit. An associated method of delivering a fluid having desired pressure to a conduit is also provided.

Claims

1. A fluid delivery apparatus comprising:

a chamber for holding a conduit;

fluid supply means for delivering to said conduit a fluid having a pressure;

means for modulating said fluid pressure before said fluid is delivered to said conduit to produce a desired fluid pressure for delivery to said conduit;

said modulating means including;

mechanical means for at least partially restricting said delivery of said fluid to said conduit;

means for measuring the pressure of said fluid prior to said fluid being delivered to said conduit;

means for adjusting said mechanical means based on a comparison of said pressure of said fluid as measured by said measuring means and said desired fluid pressure, said adjusting means includes a motion controller means; and

said mechanical means includes (i) a linear motor electrically connected to said controller means and (ii) gate valve means in operative association with said linear motor.

2. The apparatus of claim 1, wherein

said adjusting means includes a microprocessor.

3. The apparatus of claim 2, wherein

said microprocessor (i) stores a plurality of pressure waveforms from which can be selected said desired pressure waveform and (ii) stores a motion controller computer program.

4. The apparatus of claim 3, wherein

said microprocessor (i) receives input from a user to modify said selected desired pressure waveform and (ii) modifies said selected desired pressure waveform based on said user provided information.

5. The apparatus of claim 3, wherein

said motion controller means (i) receives said desired pressure waveform and said computer program instructions from said microprocessor and (ii) causes said mechanical means to move based on said desired pressure waveform and said computer program instructions.

6. The apparatus of claim 1, wherein

said gate valve means includes (i) a housing defining a passageway in which said fluid can flow and (ii) a gate movably disposed in said passageway, whereby movement of said gate modulates said fluid pressure.

7. The apparatus of claim 1, wherein

said conduit is a vascular tissue;

and

said chamber defines an enclosed space, said enclosed space containing a cell culture media for bathing said vascular tissue.

8. The apparatus of claim 1, including

collection device means downstream of said chamber for receiving said fluid after said fluid has flowed through said conduit and delivering said fluid back to said fluid supply means for circulation to said conduit.

9. A fluid delivery apparatus comprising:

a chamber for holding a conduit;

fluid supply means for delivering to said conduit a fluid having a pressure;

means for modulating said fluid pressure before said fluid is delivered to said conduit to produce a desired fluid pressure for delivery to said conduit;

said modulating means including;

mechanical means for at least partially restricting said delivery of said fluid to said conduit;

means for measuring the pressure of said fluid prior to said fluid being delivered to said conduit;

means for adjusting said mechanical means based on a comparison of said pressure of said fluid as measured by said measuring means and said desired fluid pressure;

collection device means downstream of said chamber for receiving said fluid after said fluid has flowed through said conduit and delivering said fluid back to said fluid supply means for circulation to said conduit; and

gas supply means connected to said collection device for supplying a gas mixture to said fluid disposed in said collection device.

10. A method of delivering a fluid having a desired pressure to a conduit, said method comprising:

providing (1) a chamber to hold said conduit and (ii) fluid supply means for delivering said fluid to said conduit;

modulating the pressure of said fluid before said fluid is delivered to said conduit so that said fluid has said desired pressure;

said modulating step comprising;

at least partially restricting said delivery of said fluid to said conduit;

measuring the pressure of said fluid prior to said fluid entering into said conduit;

comparing said measured fluid pressure to said desired pressure; and

adjusting said restriction of said delivery of said fluid to said conduit based on said comparison;

employing as said conduit vascular tissue from a human or an animal; and

employing said method to condition a human saphenous vein for use in a bypass surgical procedure.

11. A method of delivering a fluid having a desired pressure to a conduit, said method comprising:

providing (i) a chamber to hold said conduit and (ii) fluid supply means for delivering said fluid to said conduit;

modulating the pressure of said fluid before said fluid is delivered to said conduit so that said fluid has said desired pressure;

said modulating step comprising;

at least partially restricting said delivery of said fluid to said conduit;

measuring the pressure of said fluid prior to said fluid entering into said conduit;

comparing said measured fluid pressure to said desired pressure; and

adjusting said restriction of said delivery of said fluid to said conduit based on said comparison;

employing as said conduit vascular tissue from a human or an animal; and

introducing into said fluid a pharmaceutical compound, whereby the effect of said compound on said vascular tissue can be determined.

12. The method of claim 11, including

employing as said desired pressure a pressure waveform having a plurality of discrete pressure data points;

and

repeating said modulating step for each of said discrete pressure data points.

13. The method of claim 12, including

providing modulating means to modulate said pressure of said fluid, said modulating means including (i) mechanical means for at least partially restricting said delivery of said fluid to said conduit;

(ii) means for measuring the pressure of said fluid prior to said fluid being delivered to said conduit; and

(iii) means for adjusting said mechanical means based on a comparison of said pressure of said fluid as measured by said measuring means and said desired pressure;

employing as said adjusting means a microprocessor and motion controller means;

storing in said microprocessor means a plurality of pressure waveforms; and

selecting one of said pressure waveforms as said desired pressure.

14. The method of claim 13, including

storing in said microprocessor means a motion controller computer program;

and

adjusting said mechanical means based on said motion controller computer program.

15. The method of claim 14, including

said selected pressure waveform having pressure waveform characteristics;

and

modifying said pressure waveform characteristics to obtain said desired pressure.