Internal bleeding detection apparatus

• US 8,768,429 B2
• Filed: 12/28/2006
• Issued: 07/01/2014
• Est. Priority Date: 12/23/2005
• Status: Active Grant

• Current Assignee: E.I.T. Pty., Ltd.
• Original Assignee: E.I.T. Pty., Ltd.
• Inventors: Sadleir, Rosalind, Duncan, Andrew
• Primary Examiner(s): TOWA, RENE T
• Application Number:
  US12/086,976
• Publication Number:
  US 20100049077A1
• Time in Patent Office: 2,742 Days
• Field of Search: 600371-372, 600382-384, 600386-394, 600/547, 600/554
• US Class Current: 600/390
• CPC Class Codes: A61B 5/0002 Remote monitoring of patients using telemetry, e.g. transmission of vital signals via a communication network A61B5/07 takes precedence; transmission systems for measured values G08C; transmission H04B; transmission of digital information H04L; wireless communication networks H04W
• CPC Class Codes: A61B 5/02042 Determining blood loss or bleeding, e.g. during a surgical procedure
• CPC Class Codes: A61B 5/053 Measuring electrical impedance or conductance of a portion of the body
• CPC Class Codes: A61B 5/0536 Impedance imaging, e.g. by tomography
• CPC Class Codes: A61B 5/0537 Measuring body composition by impedance, e.g. tissue hydration or fat content
• CPC Class Codes: A61B 5/6831 Straps, bands or harnesses

Abstract

An EIT system (1) adapted to detect internal bleeding in a body portion, the EIT system (1) comprising a plurality of electrodes (3) adapted in use to extend in a substantially linear orientation across one side only of the body portion and to be applied in electrical contact with the skin of the body portion, a current source adapted to cyclically apply an electric current between one pair of the electrodes (3), a voltage measuring means to measure the voltage across each of the other pairs of the electrodes resulting from the current, a data collection system (2) and a data analysis system (4) to analyze data resulting from the voltages that are measured by the voltage measuring means, wherein the analysis system (4) is configured to obtain quantitative information related to amounts and rates of conductive tissue changes occurring in the body, based on an EIT analysis equivalent to that obtained from data derived from electrodes spaced around the full perimeter of the body portion. Also disclosed is an electrode belt suitable for bioelectrical use and in particular for detection of change of volume of tissue in a body portion.

Claims

1. An electrode belt for use with an Electrical Impedance Tomography (EIT) system, the belt comprising:

a core layer comprising a plurality of electrodes spaced along an elongate length of the belt, the electrodes each having a contact face configured to contact and make electrical connection with skin of a portion of a body of a patient under examination;

the core layer disposed between a first insulating layer and a second insulating layer, wherein the first insulating layer provides insulation over the electrodes and the second insulating layer does not provide insulation over the electrodes, thereby allowing the electrodes to be exposed on only one side thereof;

a first shielding layer disposed over the first insulating layer and a second shielding layer disposed over the second insulating layer, wherein the first and second shielding layers comprise a conductive material thereby providing circumferential active or ground shielding for the belt;

a first outer layer disposed over the first shielding layer and a second outer layer disposed over the second insulating layer, the second outer layer including a plurality of apertures corresponding to the electrodes to provide engagement of only one side of the electrodes on the skin of the portion of the body;

wherein the core layer, the first and second insulating layers, and the first and second shielding layers are created using a multilayer printing process; and

the belt being configured to, in use, extend substantially from one side of the portion of the body of the patient under examination to another side of the portion of the body of the patient under examination without encircling the body of the patient.

2. An electrode belt as claimed in claim 1, wherein the contact faces are of elongate form, the elongate length of the contact faces being oriented transversely to the elongate length of the belt.

3. An electrode belt as claimed in claim 1, wherein the contact faces are substantially rectangular with a length in the range of 75 mm to 100 mm and a width in the range of 5 to 25 mm.

4. An electrode belt as claimed in claim 1, wherein the belt is flexible to enable the belt to conform to a profile of the body portion upon which the belt is placed to facilitate contact of each electrode with the body portion.

5. An electrode belt as claimed in claim 1, wherein, the portion of the body is an abdomen, and opposing ends of the belt are formed with a curvature to facilitate contact of electrodes in a vicinity of sides of the abdomen when in use.

6. An electrode belt as claimed in claim 1, wherein at least one selected from the electrodes and ends of the belt, are provided with an adhesive surround or an adhesive member to facilitate secure engagement of the one selected from the electrodes and the ends of the belt with the skin.

7. An electrode belt as claimed in claim 1, wherein each of the electrodes has a conductive track connecting each electrode with a printed termination.

8. An electrode belt as claimed in claim 1, wherein, the contact faces are of elongate form, an elongate length of each contact face being oriented transversely to the elongate length of the belt, and

longitudinal extensions of the respective contact faces of the electrodes facilitates sensitive surveying of a region extending at least one half of the electrode length above and below an electrode extent.

9. An electrode belt as claimed in claim 1, wherein the core layer includes at least eight electrodes.