WO1994024932B1 - Diagnostic impedance measuring system - Google Patents
Diagnostic impedance measuring systemInfo
- Publication number
- WO1994024932B1 WO1994024932B1 PCT/US1994/004035 US9404035W WO9424932B1 WO 1994024932 B1 WO1994024932 B1 WO 1994024932B1 US 9404035 W US9404035 W US 9404035W WO 9424932 B1 WO9424932 B1 WO 9424932B1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- impedance
- reference electrodes
- signals
- electrodes
- signal
- Prior art date
Links
- 238000009413 insulation Methods 0.000 claims 1
- 239000000523 sample Substances 0.000 abstract 3
- 238000011156 evaluation Methods 0.000 abstract 1
- 210000001519 tissues Anatomy 0.000 abstract 1
Abstract
A diagnostic impedance measuring system (10) having an elongate tissue-penetrating probe member (12) with a plurality of axially spaced reference electrodes (20A-C) disposed about a distal portion of the probe (12). The reference electrodes (20A-C) measure the impedance of the biological tissue adjacent each electrode. A comparator (42) compares the measured impedance of at least a first and a second of the reference electrodes (20A-C), and generates a first signal indicative of the impedance difference between the two electrodes. The comparator compares the measured impedance between either the first or second electrode and one additional electrode, and generates a second signal indicative of the impedance difference between the two electrodes. The comparator compares the first and second signals and generates a third signal indicative of the impedance difference between the two signals. The third signal communicates with a signal evaluation element that determines the relative position of the probe (12).
Claims
1. (Amended) A diagnostic impedance measuring system comprising: an elongate tissue-penetrating insufflation needle having a distal end and a proximal end; a plurality of axially spaced reference electrodes disposed about the distal end of the insufflation needle; means for supplying a diagnostic level of energy to the electrodes; first comparator means for comparing the measured impedance adjacent at least a first and a second of the reference electrodes and generating a first signal indicative of the impedance difference therebetween; second comparator means for comparing the measured impedance adjacent either the first or second reference electrode and one additional reference electrode, and generating a second signal indicative of the impedance difference therebetween; third comparator means for comparing the first and second signals and generating a third signal indicative of the impedance difference between the first and second signals; and means for evaluating the third signal to determine the relative position of the insulation needle within a patient's body.
2. Canceled.
3. The system of claim 1 wherein the means for supplying diagnostic level of energy to the electrodes communicates with an electrosurgical generator.
4. (Amended) The system of claim 1 wherein the third signal indicative of the impedance difference between the first and second signals is one of: a NULL signal indicating that the difference in impedance between the first and second signals is zero, and a non-NULL signal indicating that the impedance difference between the first and second signals is greater or less than zero.
5. The system of claim 4 wherein the means for evaluating the third signal generates an audible signal when the third signal is a non-NULL signal.
6. The system of claim 1 wherein the voltage delivered across the reference electrodes is in the range of 0.5 to 3.0 volts.
7. The system of claim 1 wherein the current delivered through the reference electrodes is in the range of 1.0 mA to 10 mA. -14-
8. (Amended) The system of claim 1 wherein three reference electrodes are positioned at the distal end of the insufflation needle and are axially spaced apart from each other by about 2 to 6 mm.
9. (Amended) A diagnostic impedance measuring system for determining the relative position within a patient's body of an insufflation needle having a proximal end and a distal end, comprising: an electrosurgical generator; a plurality of axially spaced reference electrodes disposed upon a distal end of the insufflation needle; comparator means in electrical communication with the reference electrodes for comparing the impedance measured adjacent the electrodes and generating an output signal indicative of the impedance difference; and means for evaluating said output signal to determine the relative position of the insufflation needle within the patient's body.
10. The system of claim 9 wherein the electrosurgical generator delivers a diagnostic level of energy to the reference electrodes.
11. (Amended) The system of claim 9 wherein the output signal indicative of the impedance difference is one of: a NULL signal indicating that the impedance difference is zero, and a non-NULL signal indicating that the impedance difference is greater or less than zero.
12. The system of claim 11 wherein the means for evaluating the output signal generates an audible signal when the output signal is a non-NULL signal.
13. The system of claim 9 wherein the voltage delivered across the reference electrodes is in the range of 0.5 to 3.0 volts.
14. The system of claim 9 wherein the current delivered through the reference electrodes is in the range of 1.0 mA to 10 mA.
15. (Amended) A diagnostic impedance measuring device comprising: an elongate insufflation needle having a distal end and a proximal end; a plurality of axially spaced reference electrodes disposed about the distal end of the insufflation needle; -15-
means for supplying a diagnostic level of energy to the electrodes; first comparator means for comparing the measured impedance adjacent at least a first and a second of the reference electrodes and generating a first signal indicative of the impedance difference therebetween; second comparator means for comparing the measured impedance adjacent either the first or second reference electrode and one additional reference electrode, and generating a second signal indicative of the impedance difference therebetween; and third comparator means for comparing the first and second signals and generating a third signal indicative of the impedance difference between the first and second signals.
16. The system of claim 15 wherein the means for supplying diagnostic energy to the electrodes communicates with an electrosurgical generator.
17. (Amended) The system of claim 15 wherein the third signal indicative of the impedance difference between the first and second signals is one of: a NULL signal indicating that the difference in impedance between the first and second signals is zero, and a non-NULL signal indicating that the difference in impedance between the first and second signals is greater or less than zero.
18. The system of claim 15 wherein the voltage delivered across the reference electrodes is in the range of 0.5 to 3.0 volts.
19. The system of claim 15 wherein the current delivered through the reference electrodes is in the range of 1.0 mA to 10 mA.
20. Canceled.
21. (Amended) The system of claim 15 wherein three reference electrodes are positioned at the distal end of the insufflation needle and are axially spaced apart from each other by about 2 to 6 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU66655/94A AU6665594A (en) | 1993-04-30 | 1994-04-13 | Diagnostic impedance measuring system |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US08/056,364 US5335668A (en) | 1993-04-30 | 1993-04-30 | Diagnostic impedance measuring system for an insufflation needle |
| US08/056,364 | 1993-04-30 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| WO1994024932A1 WO1994024932A1 (en) | 1994-11-10 |
| WO1994024932B1 true WO1994024932B1 (en) | 1994-12-22 |
Family
ID=22003907
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/US1994/004035 WO1994024932A1 (en) | 1993-04-30 | 1994-04-13 | Diagnostic impedance measuring system |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US5335668A (en) |
| AU (1) | AU6665594A (en) |
| WO (1) | WO1994024932A1 (en) |
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| US9220439B2 (en) | 2006-12-29 | 2015-12-29 | St. Jude Medical, Atrial Fibrillation Division, Inc. | Navigational reference dislodgement detection method and system |
| US9585586B2 (en) | 2006-12-29 | 2017-03-07 | St. Jude Medical, Atrial Fibrillation Division, Inc. | Navigational reference dislodgement detection method and system |
| US8374673B2 (en) | 2007-01-25 | 2013-02-12 | Warsaw Orthopedic, Inc. | Integrated surgical navigational and neuromonitoring system having automated surgical assistance and control |
| US7987001B2 (en) | 2007-01-25 | 2011-07-26 | Warsaw Orthopedic, Inc. | Surgical navigational and neuromonitoring instrument |
| SE532140C2 (en) * | 2007-09-28 | 2009-11-03 | Clinical Laserthermia Systems | Device for positioning implantable leads |
| FI20075978A0 (en) * | 2007-12-31 | 2007-12-31 | Katja Paassilta | Arrangement and method |
| US8747400B2 (en) | 2008-08-13 | 2014-06-10 | Arthrocare Corporation | Systems and methods for screen electrode securement |
| FR2939199B1 (en) * | 2008-12-02 | 2011-02-11 | C2 Diagnostics | METHOD AND DEVICE FOR FLOW CYTOMETRY WITHOUT SAGING FLUID |
| US8355799B2 (en) | 2008-12-12 | 2013-01-15 | Arthrocare Corporation | Systems and methods for limiting joint temperature |
| US8317786B2 (en) | 2009-09-25 | 2012-11-27 | AthroCare Corporation | System, method and apparatus for electrosurgical instrument with movable suction sheath |
| US8323279B2 (en) | 2009-09-25 | 2012-12-04 | Arthocare Corporation | System, method and apparatus for electrosurgical instrument with movable fluid delivery sheath |
| US8845631B2 (en) | 2010-04-28 | 2014-09-30 | Medtronic Ablation Frontiers Llc | Systems and methods of performing medical procedures |
| US8696659B2 (en) | 2010-04-30 | 2014-04-15 | Arthrocare Corporation | Electrosurgical system and method having enhanced temperature measurement |
| US8700133B2 (en) | 2012-06-18 | 2014-04-15 | Smart Iv Llc | Apparatus and method for monitoring catheter insertion |
| US9597482B2 (en) | 2012-06-18 | 2017-03-21 | Smart Iv Llc | Apparatus and method for monitoring catheter insertion |
| US20150216442A1 (en) * | 2012-07-24 | 2015-08-06 | Lev Lavy | Multilayer coaxial probe for impedance spatial contrast measurement |
| PL226423B1 (en) * | 2012-12-21 | 2017-07-31 | Bumar Elektronika Spółka Akcyjna | Probe measuring system |
| US9526556B2 (en) | 2014-02-28 | 2016-12-27 | Arthrocare Corporation | Systems and methods systems related to electrosurgical wands with screen electrodes |
| US9943682B2 (en) | 2014-05-06 | 2018-04-17 | Medtronic, Inc. | Method and apparatus for determining suitability of a lead implant location |
| US9597142B2 (en) | 2014-07-24 | 2017-03-21 | Arthrocare Corporation | Method and system related to electrosurgical procedures |
| US9649148B2 (en) | 2014-07-24 | 2017-05-16 | Arthrocare Corporation | Electrosurgical system and method having enhanced arc prevention |
| WO2017155999A1 (en) | 2016-03-07 | 2017-09-14 | Hansa Medical Products, Inc. | Apparatus and method for forming an opening in patient's tissue |
| US10143839B1 (en) | 2017-07-05 | 2018-12-04 | Medtronic, Inc. | Lead navigation guidance |
| WO2019010330A1 (en) | 2017-07-07 | 2019-01-10 | University Of Pittsburgh- Of The Commonwealth System Of Higher Education | Catheter insertion systems |
| US10898720B2 (en) | 2017-10-17 | 2021-01-26 | Medtronic, Inc. | Impedance sensing |
| WO2019217883A1 (en) * | 2018-05-10 | 2019-11-14 | University Of Pittsburgh - Of The Commonwealth System Of Higher Education | Sensing cannula systems |
| US20220273188A1 (en) * | 2019-07-29 | 2022-09-01 | University Of Pittsburgh - Of The Commonwealth System Of Higher Education | Sensing cannula systems |
| US11246637B2 (en) * | 2020-05-11 | 2022-02-15 | Alphatec Spine, Inc. | Stimulating targeting needle |
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-
1993
- 1993-04-30 US US08/056,364 patent/US5335668A/en not_active Expired - Lifetime
-
1994
- 1994-04-13 AU AU66655/94A patent/AU6665594A/en not_active Abandoned
- 1994-04-13 WO PCT/US1994/004035 patent/WO1994024932A1/en active Application Filing
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