WO2004071293A1 - Methods and apparatus for measuring pressure profiles - Google Patents
Methods and apparatus for measuring pressure profiles Download PDFInfo
- Publication number
- WO2004071293A1 WO2004071293A1 PCT/CH2003/000113 CH0300113W WO2004071293A1 WO 2004071293 A1 WO2004071293 A1 WO 2004071293A1 CH 0300113 W CH0300113 W CH 0300113W WO 2004071293 A1 WO2004071293 A1 WO 2004071293A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- channel
- frequency
- tubing
- individually
- catheter
- Prior art date
Links
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/42—Detecting, measuring or recording for evaluating the gastrointestinal, the endocrine or the exocrine systems
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/03—Detecting, measuring or recording fluid pressure within the body other than blood pressure, e.g. cerebral pressure; Measuring pressure in body tissues or organs
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/03—Detecting, measuring or recording fluid pressure within the body other than blood pressure, e.g. cerebral pressure; Measuring pressure in body tissues or organs
- A61B5/036—Detecting, measuring or recording fluid pressure within the body other than blood pressure, e.g. cerebral pressure; Measuring pressure in body tissues or organs by means introduced into body tracts
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M25/00—Catheters; Hollow probes
- A61M2025/0001—Catheters; Hollow probes for pressure measurement
- A61M2025/0003—Catheters; Hollow probes for pressure measurement having an additional lumen transmitting fluid pressure to the outside for measurement
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M25/00—Catheters; Hollow probes
- A61M25/0021—Catheters; Hollow probes characterised by the form of the tubing
- A61M25/0023—Catheters; Hollow probes characterised by the form of the tubing by the form of the lumen, e.g. cross-section, variable diameter
- A61M25/0026—Multi-lumen catheters with stationary elements
- A61M2025/0036—Multi-lumen catheters with stationary elements with more than four lumina
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M25/00—Catheters; Hollow probes
- A61M25/0021—Catheters; Hollow probes characterised by the form of the tubing
- A61M25/0023—Catheters; Hollow probes characterised by the form of the tubing by the form of the lumen, e.g. cross-section, variable diameter
- A61M25/0026—Multi-lumen catheters with stationary elements
- A61M2025/004—Multi-lumen catheters with stationary elements characterized by lumina being arranged circumferentially
Definitions
- the invention refers to medical investigation or diagnostic tools and methods applicable to mammals, more specifically to methods for measuring pressure profiles in various body tracts or cavities.
- the basis of that highly performing technique is linked to the deformation of the shape of a saline solution caused by an external pressure when applied to the catheter lumen in which the saline solution is located; of course provided the walls of the catheter tubing in which the saline solution is filled in are thin enough to be deflected by the external pressure.
- the impedance of the saline solution will change when the shape is changed through the applied pressure along the axis of the tubing and over time, the most sensitive part of the saline solution column being the front of same. So variations of the pressure can be followed over time. As performed this method provides one- dimensional pressure profiles only.
- the present invention provides a very efficient solution which easily overcomes all the obstacles currently met.
- the invention provides first a method for performing pressure measurements by means of pressure profile sensors, which comprises using a multichannel catheter each channel of which being individually excited electrically.
- the invention further provides using the above method for performing pressure profile measurements in body tracts or cavities such as esophagus, stomach, intestine, urinary tract, bladder or uterus.
- the invention also provides a multichannel catheter useful for performing the said method which comprises an internal tubing surrounded coaxially by an external tubing and so leaving a crown inner space which is divided in two or more channels by walls which are distributed symmetrically around the longitudinal axis of the catheter.
- a multichannel catheter useful for performing the said method which comprises an internal tubing surrounded coaxially by an external tubing and so leaving a crown inner space which is divided in two or more channels by walls which are distributed symmetrically around the longitudinal axis of the catheter.
- Fig. 1 to 3 illustrate specific embodiments of multichannel catheters which can be used within the frame of the present invention.
- Fig. 3 more particularly shows the deformation the outer wall of a predefined lumen caused by an external pressure.
- Multichannel catheters comprise an internal tubing 5 surrounded coaxially by an external tubing 6 which set a crown spatial arrangement which is divided in two, three, four or even more lumens (channels) 1 , 2. ... by walls 3, 4, ... distributed symmetrically around the longitudinal axis of the catheter 7.
- the web fitted in the walls 3, 4, ... generating the lumen 1, 2, ...of the inner space has to be stiff enough in the said walls but soft enough in the outside tubing 6 to let the pressure deform the said outside wall 6 - see Fig. 3 -.
- a preferred configuration of a multichannel catheter is a four lumen configuration where the lumens are offset by 90 degrees - see Fig. 2.
- the central tubing (5) can be filled with gas or liquid, or be significantly more reduce with respect to its cross section than tubing 6 or even have no interior space. It will be up to those skilled in the art to select the appropriate material and configuration depending on the specific conditions to be met.
- Multichannel tubing used within the frame of the invention can be manufactured using commercially available innocuous polymer materials and techniques, e.g. extrusion forming.
- Suitable polymer material can be selected among silicon, rubber, latex, polyurethane, PVC, polypropylene, PE or the like.
- Such polymer material can further be made electrically conductive through doping with carbon or metal powder.
- each of the lumen (channels) of catheters defined here above is electrically excited individually what affords individual signals which are eventually subject to detection, analysis, interpretation or e.g. convenient display.
- Each channel is furthermore excited in such a way to provide individual, distinct excitation signals for detection and registration, i.e. channel 1 leading to a signal 1 , channel 2 leading to a signal 2 distinct from signal 1, channel 3 leading a signal 3 which is distinct from both signal 1 and 2, etc ....
- the distinction of the electrical excitation applied to each individual channel can be performed by modulating either the frequency or the phase shift or both.
- frequency modulation can be performed by steps of at least about 0.1 kHz to about 10 kHz, e.g. 2, 5, 10 kHz preferably by steps of 1 to 10 kHz.
- Phase shift modulation either performed separately from or simultaneously with frequency modulation, can be performed by steps of at least about 10 degrees, e.g. 20, 30, 90 degrees preferably by steps of 90 degrees.
- Simultaneous modulation of frequency and phase shift comprise preferably steps of 1 to 10 kHz and 90 degrees, respectively. Cross talk between different channels is thus avoided and then the signals are separated well enough so that they can travel individually through the body and get picked up eventually by one body electrode only and then processed according the PPS-Method.
- multichannel catheter technique is particularly convenient for analysing the space angle dependency of the pressure which acts on said catheter, specially when more than one lumen (channel) is squeezed when subject pressure in locations such as sphincters.
- first electrical excitation of one channel only e.g. channel 1
- an outside reference pressure signal from a relevant portion or space angle of the body so to obtain a unambiguous spatial dedication of the orientation of said channel.
Landscapes
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Molecular Biology (AREA)
- Surgery (AREA)
- Biophysics (AREA)
- Pathology (AREA)
- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- Medical Informatics (AREA)
- Veterinary Medicine (AREA)
- Physics & Mathematics (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Hematology (AREA)
- Endocrinology (AREA)
- Gastroenterology & Hepatology (AREA)
- Physiology (AREA)
- Measuring And Recording Apparatus For Diagnosis (AREA)
- Measuring Fluid Pressure (AREA)
- Recording Measured Values (AREA)
Abstract
Description
Claims
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2003203119A AU2003203119A1 (en) | 2003-02-17 | 2003-02-17 | Methods and apparatus for measuring pressure profiles |
DE60320315T DE60320315T2 (en) | 2003-02-17 | 2003-02-17 | DEVICE FOR MEASURING PRINTING PROFILES |
AT03701425T ATE391457T1 (en) | 2003-02-17 | 2003-02-17 | DEVICE FOR MEASURING PRESSURE PROFILES |
PCT/CH2003/000113 WO2004071293A1 (en) | 2003-02-17 | 2003-02-17 | Methods and apparatus for measuring pressure profiles |
EP03701425A EP1596715B1 (en) | 2003-02-17 | 2003-02-17 | Apparatus for measuring pressure profiles |
US10/545,175 US8088078B2 (en) | 2003-02-17 | 2003-02-17 | Methods and apparatus for measuring pressure profiles |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/CH2003/000113 WO2004071293A1 (en) | 2003-02-17 | 2003-02-17 | Methods and apparatus for measuring pressure profiles |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2004071293A1 true WO2004071293A1 (en) | 2004-08-26 |
Family
ID=32855125
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/CH2003/000113 WO2004071293A1 (en) | 2003-02-17 | 2003-02-17 | Methods and apparatus for measuring pressure profiles |
Country Status (6)
Country | Link |
---|---|
US (1) | US8088078B2 (en) |
EP (1) | EP1596715B1 (en) |
AT (1) | ATE391457T1 (en) |
AU (1) | AU2003203119A1 (en) |
DE (1) | DE60320315T2 (en) |
WO (1) | WO2004071293A1 (en) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9603558B2 (en) | 2008-08-15 | 2017-03-28 | Theranova, Llc | Methods and devices for the diagnosis and treatment of diabetes |
US10206802B2 (en) | 2011-03-07 | 2019-02-19 | Theranova, Llc | Wearable apparatus for the treatment or prevention of osteopenia and osteoporosis, stimulating bone growth, preserving or improving bone mineral density, and inhibiting adipogenesis |
US9655555B2 (en) | 2011-03-07 | 2017-05-23 | Potrero Medical, Inc. | Sensing foley catheter |
WO2019049954A1 (en) * | 2017-09-07 | 2019-03-14 | 大塚テクノ株式会社 | Urinary catheter |
JP2019187506A (en) * | 2018-04-18 | 2019-10-31 | 大塚テクノ株式会社 | Valve assembly and urethra catheter |
US11529449B2 (en) * | 2019-04-15 | 2022-12-20 | Medtronic, Inc. | Medical device dislodgment detection |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3659588A (en) * | 1970-04-08 | 1972-05-02 | Medtronic Inc | Catheter apparatus |
WO2001054563A2 (en) * | 2000-01-31 | 2001-08-02 | Integrated Biosensing Technologies | Method and apparatus for biopotential sensing and stimulation |
US6296615B1 (en) * | 1999-03-05 | 2001-10-02 | Data Sciences International, Inc. | Catheter with physiological sensor |
US6450972B1 (en) * | 1997-06-07 | 2002-09-17 | Meinhard Knoll | Sensor system for measuring pressure profiles |
US6459972B2 (en) | 2000-06-16 | 2002-10-01 | Unisia Jecs Corporation | Diagnostic apparatus and method for motor driven power-assisted steering system |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2054734C1 (en) * | 1970-11-06 | 1980-10-23 | Siemens Ag, 1000 Berlin Und 8000 Muenchen | Method for the synchronization of a transmission system |
KR920002273B1 (en) * | 1989-07-08 | 1992-03-20 | 삼성전자 주식회사 | Quadrature modulation and demodulation method and circuit using remoting pll |
US5062296A (en) * | 1990-09-20 | 1991-11-05 | The United States Of America As Represented By The Department Of Energy | Resonant ultrasound spectroscopy |
US20030065373A1 (en) * | 2001-10-02 | 2003-04-03 | Lovett Eric G. | Medical device having rheometric materials and method therefor |
US6926509B2 (en) * | 2002-05-31 | 2005-08-09 | Ndh Medical, Inc. | Apparatus for extruding tubing having a variable wall thickness |
-
2003
- 2003-02-17 EP EP03701425A patent/EP1596715B1/en not_active Expired - Lifetime
- 2003-02-17 WO PCT/CH2003/000113 patent/WO2004071293A1/en active IP Right Grant
- 2003-02-17 DE DE60320315T patent/DE60320315T2/en not_active Expired - Lifetime
- 2003-02-17 US US10/545,175 patent/US8088078B2/en not_active Expired - Fee Related
- 2003-02-17 AU AU2003203119A patent/AU2003203119A1/en not_active Abandoned
- 2003-02-17 AT AT03701425T patent/ATE391457T1/en not_active IP Right Cessation
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3659588A (en) * | 1970-04-08 | 1972-05-02 | Medtronic Inc | Catheter apparatus |
US6450972B1 (en) * | 1997-06-07 | 2002-09-17 | Meinhard Knoll | Sensor system for measuring pressure profiles |
US6296615B1 (en) * | 1999-03-05 | 2001-10-02 | Data Sciences International, Inc. | Catheter with physiological sensor |
WO2001054563A2 (en) * | 2000-01-31 | 2001-08-02 | Integrated Biosensing Technologies | Method and apparatus for biopotential sensing and stimulation |
US6459972B2 (en) | 2000-06-16 | 2002-10-01 | Unisia Jecs Corporation | Diagnostic apparatus and method for motor driven power-assisted steering system |
Non-Patent Citations (1)
Title |
---|
KNOLL M ET AL: "Pressure profile sensing system", SENSORS AND ACTUATORS A, ELSEVIER SEQUOIA S.A., LAUSANNE, CH, vol. 93, no. 1, 25 August 2001 (2001-08-25), pages 52 - 56, XP004255506, ISSN: 0924-4247 * |
Also Published As
Publication number | Publication date |
---|---|
DE60320315T2 (en) | 2009-06-25 |
US8088078B2 (en) | 2012-01-03 |
EP1596715A1 (en) | 2005-11-23 |
ATE391457T1 (en) | 2008-04-15 |
DE60320315D1 (en) | 2008-05-21 |
AU2003203119A1 (en) | 2004-09-06 |
US20060116601A1 (en) | 2006-06-01 |
EP1596715B1 (en) | 2008-04-09 |
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