Probe penetration detector and method of operation

• US 6,603,997 B2
• Filed: 11/02/2001
• Issued: 08/05/2003
• Est. Priority Date: 11/02/2001
• Status: Expired due to Fees

• Current Assignee: Michael C. Doody
• Original Assignee: Michael C. Doody
• Inventors: Doody, Michael C.
• Primary Examiner(s): Hindenburg, Max F.
• Assistant Examiner(s): WINGOOD, PAMELA LYNN
• Application Number:
  US10/002,364
• Publication Number:
  US 20030088186A1
• Time in Patent Office: 641 Days
• Field of Search: 600/547
• US Class Current: 600/547
• CPC Class Codes: A61B 5/053 Measuring electrical impedance or conductance of a portion of the body
• CPC Class Codes: A61B 5/0538 invasively, e.g. using a catheter
• CPC Class Codes: A61B 5/6848 Needles

Abstract

A probe penetration detector system and method of operation is disclosed for verifying the location of a probe within a patient during a surgical procedure. The system includes an electrically conductive antenna such as a probe adapted for insertion into body tissue and into a body cavity. A transmitter generates transmitted signals of a selected frequency range that are transmitted to the probe by an electrical connection or inductive coupling between the probe and transmitter for optimizing the conductance of transmitted signals to the probe. As the antenna probe is inserted through the body tissue and into a body cavity, a detector monitors feedback signals of energy reflected from the probe. As the feedback signals change in relation to the antenna probe location, an operator determines when the feedback signals are optimized, therefore providing notification that the antenna probe is positioned within a preferred tissue layer or body cavity.

Claims

1. A probe penetration detector system for the surgical examination by an operator of respective layers of body tissue and a body cavity of a patient, comprising:

an electrically conductive probe adapted for being inserted into the respective layers of body tissue and into the body cavity of the patient, said probe serving as an antenna while proximal of respective layers of body tissue and the body cavity of the patient;

a transmitter for generation of a plurality of radio frequency signals transmitted to said probe;

a connector in electrical connection with said transmitter, said connector disposed proximal of said probe for transmission by capacitive coupling of said radio frequency signals to said probe; and

a detector to monitor a selected feedback parameter for said probe, said detector including circuitry for notification of said selected feedback parameter in to the operator as each respective layer of the body tissue and the body cavity is penetrated by said probe;

whereby said selected feedback parameter provides the operator with an indicator of penetration of said probe through the respective layers of body tissue and into the body cavity of the patient.

2. The probe penetration detector system of claim 1, wherein said electrically conductive probe includes a needle having a length portion and a penetration end, said length portion having insulation thereon, said penetration end being uninsulated for contact upon insertion into the body tissue and body cavity of the patient, whereby said uninsulated penetration end maintains optimal electrical coupling with each respective layers of body tissue and the body cavity through which said penetration end is inserted;

and

said penetration end includes a fluid flow passage therein for dispending of a fluid into the body cavity when the operator is notified by said detector of said selected feedback parameter indicating that said penetration end is inserted into the body cavity of the patient.

3. The probe penetration detector system of claim 1, wherein said transmitter includes circuitry for generation of a plurality of signals for transmission to said electrically conductive probe during penetration of said probe through the respective layers of body tissue and in the body cavity of the patient, said plurality of signals having an amplitude frequency and phase being adjustable by the operator.

4. The probe penetration detector system of claim 1, wherein said selected feedback parameter includes a parameter selected from the group consisting essentially of a voltage standing wave ratio, an impedance, a phase shift, a reactance, an inductance, a capacitance, a resistance, a transmission loss, a reflected power, a reflection coefficient, of and a return power loss for said probe.

5. The probe penetration detector system of claim 1, wherein said circuitry for notification includes a visual display of said selected feedback parameter.

6. The probe penetration detector system of claim 5, wherein said circuitry for notification further includes an audible display of said selected feedback parameter.

7. A probe penetration detector system for the surgical examination by an operator of a patient'"'"'s body tissue and a body cavity of the patient, comprising:

an electrically conductive antenna including a probe penetration unit having a probe end adapted for being inserted a selected depth into the body tissue and the body cavity of the patient;

a transmitter for generation of a plurality of radio frequency signals transmitted to said antenna;

an electrical connection between said antenna and said transmitter; and

a detector to monitor a standing wave ratio parameter for said antenna, said detector including circuitry for notification of said standing wave ratio parameter to the operator as each respective layer of the body tissue and the body cavity is penetrated by said probe end;

whereby said standing wave ratio parameter provides the operator with an indicator of penetration of said antenna probe end through each respective layer of the body tissue and into the body cavity of the patient.

8. A probe penetration detector system for the surgical examination by an operator of a patient'"'"'s body tissue and body cavity, comprising:

an electrically conductive antenna including a probe penetration unit having a probe end adapted for being inserted a selected depth into the body tissue and body cavity of the patient;

a transmitter for generation of a plurality of signals transmitted to said antenna said transmitter includes an inductive coupling between said probe penetration unit and said transmitter;

an adjusting element disposed to position said probe penetration unit to optimize said inductive coupling between said antenna and said transmitter as said probe end is inserted through each respective layer of the body tissue and into the body cavity; and

a detector to monitor an impedance parameter for said antenna, said detector including circuitry for notification of said impedance parameter to the operator;

whereby said impedance parameter provides the operator with an indicator of insertion of said antenna probe end through each respective layer of the body tissue and into the body cavity of the patient.

9. A probe penetration detector system for the surgical examination by an operator of a patient'"'"'s body tissue and a body cavity, comprising:

an electrically conductive antenna including a probe penetration unit having a probe end adapted for being inserted a selected depth into the body tissue and the body cavity of the patient;

a transmitter for generation of a plurality of signals transmitted to said antenna;

an electrical connection between said antenna and said transmitter; and

a detector to monitor a signal return power loss parameter for said antenna, said detector including circuitry for notification of said signal return power loss parameter to the operator;

whereby said signal return power loss parameter provides the operator with an indicator of penetration of said antenna probe end through each respective layer of the body tissue and into the body cavity of the patient.

10. A probe penetration detector system for the surgical examination by an operator of a body cavity of a patient, comprising:

a probe penetration unit having a probe end positioned to be removably inserted through each one of a plurality of tissue layers covering the body cavity of the patient;

a transmitter for transmission of a plurality of radio frequency signals to said probe penetration unit as said probe end is inserted through each one of the plurality of tissue layers, said transmitter includes an inductive coupling between said probe penetration unit and said transmitter;

a detector for receiving a plurality of output signals rebounded from said probe penetration unit, said detector provides analysis of said output signals in a comparison of said plurality of signals with said output signals to generate a standing wave ratio for said probe penetration unit as said probe end is inserted through each one of the plurality of tissue layers; and

an adjusting element to position said probe penetration unit to optimize said standing wave ratio as said probe end is inserted through each one of the plurality of tissue layers;

wherein when said standing wave ratio is optimized, the insertion of said probe end into the body cavity of the patient is confirmed for the operator.

11. The probe penetration detector system of claim 10, said detector including an impedance analyzer for measuring impedance of said probe penetration unit as said probe end is inserted through each one of the plurality of tissue layers.

12. The probe penetration detector system of claim 11, wherein said transmitter including circuitry for detecting a resonant frequency for said plurality of signals transmitted to said probe penetration unit as said probe end is inserted through each one of the plurality of tissue layers.

13. The probe penetration detector system of claims 12, wherein said transmitter being adjustable by the operator to optimize said plurality of signals transmitted to said probe penetration unit, whereby the operator optimizes said standing wave ratio as said probe end is inserted through each one of the plurality of tissue layers.

14. The probe penetration detector system of claim 13, wherein said inductive coupling provides a path across a junction between said probe penetration unit and said transmitter for transmission of said plurality of signals being transmitted to said probe penetration unit, said inductive coupling provides a return pathway for said plurality of output signals rebounded from said probe penetration unit.

15. A probe penetration detector system for the surgical examination by an operator of a body cavity of a patient, comprising:

a probe penetration unit having a probe positioned to be removably inserted through each one of a plurality of tissue layers covering the body cavity of the, patient;

a transmitter for transmission of a plurality of input signals to said probe as said probe is inserted through each of the plurality of tissue layers, said transmitter is connected by an inductive coupling connection with said probe penetration unit;

a detector for receiving a plurality of output signals rebounded from said probe, said detector provides analysis of said output signals in a comparison of said plurality of input signals with said output signals to generate a standing wave ratio for said probe as said probe is inserted through each of the plurality of tissue layers;

an adjusting element for positioning said probe to optimize said standing wave ratio as said probe is inserted through each one of the plurality of tissue layers; and

an impedance analyzer for analysis of impedance of said probe as said probe is inserted through each of the plurality of tissue layers;

wherein when said standing wave ratio is optimized, the, insertion of said probe into the body cavity of the patient is confirmed for the operator.

16. The probe penetration detector system of claims 15, wherein, said transmitter being adjustable by the operator to optimize said plurality of input signals transmitted to said probe, whereby the operator optimizes said standing wave ratio of said probe as said probe is inserted through each of the plurality of tissue layers.

17. The probe penetration detector system of claim 16, wherein said inductive coupling connection provides an input pathway for said plurality of input signals being transmitted to said probe, said inductive coupling connection provides a return pathway to said detector for said plurality of output signals rebounded from said probe.

18. A method to provide confirmation of the insertion of a probe through a plurality of layers of tissue and into a body cavity of a patient during a surgical procedure, comprising the steps of:

providing a probe penetration detector system including an adjusting element for the positioning of the probe through the layers of tissue of the patient;

transmitting a plurality of input signals to the probe as the probe is adjusted in positioning through each one of the layers of tissue of the patient;

detecting a plurality of output signals rebounded from the probe, said detecting step providing an analyzing step for comparing said plurality of input signals with said output signals, said analyzing step generating a standing wave ratio for said probe is adjusted in positioning through each one of the layers of tissue of the patient; and

measuring an impedance parameter of the probe as the probe is adjusted in positioning through each one of the layers of tissue, said measuring step including measuring impedance when the probe is inserted into a body cavity of the patient.

19. The method of claim 18, wherein said providing step further including a step of calibrating the probe of said probe penetration detector system, said calibrating step including selecting a probe length that is conductive to transmitting said plurality of input signals to the patient to substantially minimize the reflected power from the probe, positioned through the layers of tissue of the patient.

20. The method of claim 18, wherein said transmitting step further including the step of inducing a resonant frequency for said plurality of input signals being transmitted to said probe, said inducing step further including providing an adjusting circuitry for said plurality of input signals being transmitted as said probe is inserted through each one of said plurality of layers of tissue.