Combined pressure-volume sensor and guide wire assembly

• US 6,926,674 B2
• Filed: 04/19/2002
• Issued: 08/09/2005
• Est. Priority Date: 04/19/2001
• Status: Expired due to Term

• Current Assignee: St. Jude Medical Coordination Center BVBA (Abbott Laboratories)
• Original Assignee: Radi Medical Systems AB (Abbott Laboratories)
• Inventors: Söderqvist, Emil, Carlsson, Camilla, Brodin, Lars-Åke, Elmqvist, Håkan, Tenerz, Lars, Smith, Leif, Hammarström, Ola
• Primary Examiner(s): NATNITHITHADHA, NAVIN
• Application Number:
  US10/475,126
• Publication Number:
  US 20040116816A1
• Time in Patent Office: 1,208 Days
• Field of Search: 600/481, 600/483, 600/485, 600/486, 600/488, 600/547, 600504-507, 600/561, 600/585, 604/164.13, 607/23
• US Class Current: 600/486
• CPC Class Codes: A61B 5/02007 Evaluating blood vessel condition, e.g. elasticity, compliance
• CPC Class Codes: A61B 5/0215 by means inserted into the body catheters A61M25/00
• CPC Class Codes: A61B 5/02158 provided with two or more sensor elements
• CPC Class Codes: A61B 5/053 Measuring electrical impedance or conductance of a portion of the body
• CPC Class Codes: A61B 5/0535 Impedance plethysmography for measuring blood flow A61B5/0295
• CPC Class Codes: A61B 5/1076 for measuring dimensions inside body cavities, e.g. using catheters A61B3/1005 takes precedence
• CPC Class Codes: A61B 5/6851 Guide wires
• CPC Class Codes: A61M 2230/30 Blood pressure A61M2230/04 takes precedence
• CPC Class Codes: A61M 2230/65 Impedance, e.g. conductivity, capacity
• CPC Class Codes: A61M 25/09 Guide wires

Abstract

The invention relates to a sensor and guide wire assembly including a pressure sensor having a plurality of terminals, the sensor being mounted in the distal end region of a core wire. It also includes two to four electrodes for conductance measurement, also provided in the distal end region. Two electrodes are electrically insulated from each other.

Claims

1. A sensor and guide wire assembly having a distal end and a proximal end comprising:

a core wire having a distal end and a proximal end;

a sensor mounted in the distal end region of said core wire;

a tube enclosing said core wire over at least a fraction of a length of said core wire such that said core wire extends out from a distal end of said tube;

a first enclosure arranged to enclose a first portion of said core wire extending out from said distal end of said tube, said first enclosure being located nearer to said proximal end of said core wire than said sensor;

a second enclosure arranged to enclose a second portion of said core wire extending out from said distal end of said tube, said second enclosure being located nearer to said distal end of said core wire than said sensor;

wherein

said guide wire further comprises at least two electrodes for conductance measurement, and said at least two electrodes are electrically insulated from each other.

2. Sensor and guide wire assembly according to claim 1, wherein said first enclosure is a first coil and said second enclosure is a second coil.

3. Sensor and guide wire assembly according to claim 2, wherein said second coil or a portion thereof is used as a first of said at least two electrodes.

4. Sensor and guide wire assembly according to claim 1, wherein said first of said at least two electrodes utilises said core wire as electrical connection to the proximal end of the guide wire.

5. Sensor and guide wire assembly according to claim 1, wherein the number of electrodes for conductance measurement is four.

6. Sensor and guide wire assembly according to claim 1, wherein at least one, and preferably two of said electrodes are cylindrical and enclose said guide wire.

7. Sensor and guide wire assembly according to claim 1, wherein said tube is made of electrically conducting material and for a larger first portion covered with an insulating material;

and

said conducting material of said tube is exposed over a smaller second portion and is utilised as the second of said at least two electrodes.

8. Sensor and guide wire assembly according to claim 7, wherein said second of said at least two electrodes utilises said first portion of said tube as electrical connection to the proximal end of the guide wire.

9. Sensor and guide wire assembly according to claim 1, wherein said sensor is a pressure sensor.

10. A sensor and guide wire assembly comprising:

a pressure sensor having a plurality of terminals, the sensor being mounted in a distal end region of said guide wire;

at least two electrodes for conductance measurement provided in the distal end region of said guide wire and wherein said at least two electrodes are electrically insulated from each other;

wherein one of said sensor terminals and one of said conductance electrodes are connected to a common electrical lead.

11. Sensor and guide wire assembly according to claim 10, wherein the number of electrodes for conductance measurement is four.

12. A sensor and guide wire assembly comprising:

a pressure sensor having a plurality of terminals, the sensor being mounted in a distal end region of said guide wire;

at least two electrodes for conductance measurement provided in the distal end region of said guide wire and said at least two electrodes are electrically insulated from each other; and

wherein the guide wire includes;

a core wire having a distal end and a proximal end; and

a tube enclosing said core wire over at least a fraction of a length of said core wire such that said core wire extends out from a distal end of said tube, and said core wire and said tube respectively being used as electrical leads.

13. Sensor and guide wire assembly according to claim 12, wherein the number of electrodes for conductance measurement is four.