Pressure measuring system

• US 10,595,765 B2
• Filed: 02/28/2014
• Issued: 03/24/2020
• Est. Priority Date: 03/04/2013
• Status: Active Grant

• Current Assignee: Medical Measurement Systems BV (2941881 Canada, Inc.)
• Original Assignee: Optical Measurement Systems, LLC (Equitable IP Corporation)
• Inventors: Jensen, Michael Gondy, Witte, Jens, Van Gorkom, David, Larsen, Kristine
• Primary Examiner(s): Dougherty, Sean P
• Assistant Examiner(s): Melhus, Benjamin S
• Application Number:
  US14/772,350
• Publication Number:
  US 20160000366A1
• Time in Patent Office: 2,216 Days
• Field of Search: None
• CPC Class Codes: A61B 2560/0223 of calibration, e.g. protocols for calibrating sensors
• CPC Class Codes: A61B 5/205 Determining bladder or urethral pressure
• CPC Class Codes: A61B 5/42 Detecting, measuring or recording for evaluating the gastrointestinal, the endocrine or the exocrine systems A61B1/00, A61B5/4857, A61B5/486, A61B5/4866, A61B5/4869 take precedence
• CPC Class Codes: A61M 2025/0003 having an additional lumen transmitting fluid pressure to the outside for measurement
• CPC Class Codes: A61M 2205/3344 Measuring or controlling pressure at the body treatment site
• CPC Class Codes: A61M 2205/3348 Pressure measurement using a water column
• CPC Class Codes: A61M 39/10 Tube connectors; Tube couplings A61M39/02 takes precedence; connecting needles to syringes or hubs A61M5/34; connecting catheter tubes to hubs A61M25/0014
• CPC Class Codes: A61M 39/28 Clamping means for squeezing flexible tubes, e.g. roller clamps tube strippers A61M1/83
• CPC Class Codes: A61M 5/14232 Roller pumps
• CPC Class Codes: A61M 5/168 Means for controlling media flow to the body or for metering media to the body, e.g. drip meters, counters ; Monitoring media flow to the body flow control in general G05D7/00
• CPC Class Codes: B30B 15/161 controlling the ram speed and ram pressure, e.g. fast approach speed at low pressure, low pressing speed at high pressure
• CPC Class Codes: B30B 15/163 for accumulator-driven presses
• CPC Class Codes: B30B 15/186 Controlling the return movement of the ram, e.g. decompression valves
• CPC Class Codes: F15B 11/022 in which a rapid approach stroke is followed by a slower, high-force working stroke F15B11/0325 takes precedence
• CPC Class Codes: F15B 2211/20515 Electric motor
• CPC Class Codes: F15B 2211/20546 variable capacity
• CPC Class Codes: F15B 2211/27 Directional control by means of the pressure source
• CPC Class Codes: F15B 2211/6651 Control of the prime mover, e.g. control of the output torque or rotational speed
• CPC Class Codes: F15B 2211/7107 the output members being mechanically linked
• CPC Class Codes: F15B 2211/775 Combined control, e.g. control of speed and force for providing a high speed approach stroke with low force followed by a low speed working stroke with high force, e.g. for a hydraulic press
• CPC Class Codes: F15B 7/006 : Rotary pump input

Abstract

A pressure measuring system, including a tube system having at least one first device for measuring pressure in a fluid. The at least one first device includes a coupling element, at least one pressure transducer and at least one measuring chamber, which can be filled with a fluid. Between the first device and the feed of the fluid, the tube system has a second device for regulating a fluid flow, the second device having a tube section through which fluid can flow and at least one tube clamp, which can be set in the regulation positions open, closed and perfused.

Claims

1. Method for the automatic filling and correction of hydrostatic pressure of a pressure-measuring system, comprising:

selecting a pressure-measuring system with at least a first measuring lumen which can be filled with a fluid, and having at least first and second pressure-measuring devices and at least two flow regulation devices, wherein the pressure measuring system includes (A) a tube system that defines the first measuring lumen, (B) the at least first and second pressure-measuring devices and (C) the at least two flow regulation devices, and is connectable to (a) a fluid reservoir serving as a supply of fluid and to (b) at least one catheter lumen of at least one catheter, and

a mechanism for conveying the fluid through the tube system and into the at least one catheter,

wherein each of the at least first and second pressure-measuring devices includes a pressure transducer membrane and a measuring chamber which can be filled with fluid,

wherein the tube system further includes at least one coupling element which mechanically connects each measuring chamber via its respective membrane with a measuring area of a pressure transducer and each measuring chamber has at least two connection points for a fluid flow and, positioned between the first pressure measuring device and the supply of the fluid, the tube system has a first flow regulation device for regulating fluid flow with a perfusion tube section made of a flexible material and having a perfusion tube section lumen through which fluid can flow and has a first tube clamp into which the tube section is inserted, and

the first flow regulation device can be set to regulation positions open, closed and perfused, wherein in the closed position the perfusion tube section lumen is completely squeezed closed and in the perfused position, through a spacer in the inside of the tube section the perfusion tube section lumen is partly open even when squeezed by the first tube clamp;

wherein one of selected the flow regulation devices being the first flow regulation device with the perfusion tube section and corresponding first tube clamp, and the other flow regulation device having a second tube section and a second tube clamp, with the first measuring lumen connecting the first pressure measuring device to one catheter lumen and a second measuring lumen connecting the second pressure measuring-device to another catheter lumen;

measuring a rest pressure on each pressure transducer with the tube system and measuring lumens filled with air and connected to (a) the fluid reservoir serving as a supply of fluid and to (b) at least one catheter lumen of at least one catheter;

setting at least one of the first and second tube clamps into the closed regulation position;

setting another of the first and second tube clamps into the open regulation position and filling the tube system and one of the measuring lumens with liquid from a fluid reservoir;

setting at least one of the first and second tube clamps into the closed regulation position and correcting the hydrostatic pressure exerted by the height difference between at least one of (i) the pressure transducer and the measuring chamber and (ii) the measuring lumen and the measuring location by comparison with the previously determined rest pressure; and

setting at least the first tube clamp into the perfused regulation position.

2. The method according to claim 1, wherein the measured rest pressure for each measuring lumen is transmitted to a control device and from several measurements a mean rest pressure is determined.

3. The method according to claim 2, wherein the correction of the hydrostatic pressure exerted by the height difference between each measuring chamber and the pressure transducer sensor takes place through comparison with the mean rest pressure.

4. The method according to claim 1 wherein a quantity of liquid used for filling corresponds to the volume of the tube system and the measuring lumens.

5. The method according to claim 4, wherein the filling process is automatically ended when a quantity that corresponds to the volume of the tube system and the measuring lumens has been pumped out of the fluid reservoir into the tube system and the measuring lumens.

6. The method according to claim 4 wherein the quantity of liquid pumped into the tube system and each measuring lumen is determined by revolutions of a roller wheel of the mechanism for conveying or via a volume transducer.

7. The method according to claim 1 wherein before filling of the tube system and each measuring lumen, the corresponding tube clamp is automatically set to the open regulation position and after filling is set back into the closed regulation position.

8. The method according to claim 1 wherein the individual processing stages are carried out automatically after the start of the process.

9. The method according to claim 1 wherein the second flow regulation device is a non-perfusion flow regulation device and the second tube section is a non-perfusion tube section having a non-perfusion tube section lumen, with the second tube clamp having a basic housing with a second accommodating area for the second, non-perfusion tube section and a clamping element that can be moved between open and closed regulation positions, and wherein the clamping element in interaction with sections of the second accommodating area as pressing points in at least one closed regulation position acts on the second tube section and its non-perfusion tube section lumen by squeezing.

10. The method according to claim 1 wherein the at least one coupling element has a clamping edge and at least one rotatably borne pressing roller and each of the at least one measuring chamber has two webs arranged opposite each other, wherein one of the webs engages the clamping edge and the other web engages into the pressing roller.

11. The method according to claim 1 wherein at least one of (i) the first and second tube clamps, (ii) the coupling element, and (iii) the measuring chambers are at least in sections made of a material selected from a group which includes duroplastic or thermoplastic synthetic materials.