Apparatus for electroporation mediated delivery of drugs and genes

• US 6,241,701 B1
• Filed: 10/22/1998
• Issued: 06/05/2001
• Est. Priority Date: 08/01/1997
• Status: Expired due to Term

• Current Assignee: Oncosec Medical Incorporated (China Grand Pharmaceutical & Healthcare Holdings Ltd.)
• Original Assignee: Genetronics, Inc. (Inovio Pharmaceuticals, Inc.)
• Inventors: Hofmann, Gunter A.
• Primary Examiner(s): KENNEDY, SHARON E
• Application Number:
  US09/177,678
• Time in Patent Office: 957 Days
• Field of Search: 604/890.1, 604/19-22, 604/500, 604/501, 128/898, 607/2, 607/100, 607/116, 607/154, 435/173.5, 435/173.6
• US Class Current: 604/21
• CPC Class Codes: A61N 1/0502 Skin piercing electrodes
• CPC Class Codes: A61N 1/325 for iontophoresis, i.e. transfer of media in ionic state by an electromotoric force into the body electrodes for external use A61N1/0428
• CPC Class Codes: A61N 1/327 for enhancing the absorption properties of tissue, e.g. by electroporation
• CPC Class Codes: C12M 35/02 Electrical or electromagnetic means, e.g. for electroporation or for cell fusion

Abstract

A method and apparatus for in vivo electroporation therapy. Using electroporation therapy (EPT) as described in the invention, tumors treated by a combination of electroporation using the apparatus of the invention and a chemotherapeutic agent caused regression of tumors in vivo. In one embodiment, the invention provides a method of EPT utilizing low voltage and long pulse length for inducing cell death. One embodiment of the invention includes a system for clinical electroporation that includes a needle array electrode having a “keying” element that determines the set point of the therapy voltage pulse and/or selectable array switching patterns. A number of electrode applicator designs permit access to and treatment of a variety of tissue sites. A disposable needle tip array may be implemented.

Claims

1. An electroporation device, comprising:

(a) an electrode applicator having at least two opposing pairs of electrode needles arranged relative to one another to form a desired array;

(b) an applicator handle having a first end detachably engaged to the electrode applicator and a second end positioned to receive at least one electrical signal from a power supply, the applicator handle configured to supply the at least one electrical signal to the electrode applicator, and

(c) a power supply to provide at least one electrical signal to the second end of the applicator handle configured to supply the signal to the electrode applicator;

wherein, when selected molecules are provided to a biological sample comprising cells and at least two in pairs of electrodes are in electrical contact with the biological sample and are activated simultaneously, the electrode applicator is operable to provide separately applied pulses of high amplitude electric signals to said at least two opposing pairs of electrodes, but not all electrodes if there are more than two opposing pairs of electrodes, simultaneously and proportionately to the distance between said electrodes of a pair to electroporate the selected molecules into cells of the sample without permanently damaging the cells.

2. The device of claim 1, wherein the electrode applicator includes a shield element that separates the applicator handle from the electrode applicator.

3. The device of claim 1, wherein the electrode applicator produces electrical pulses between two needles according to a set of predetermined electrode configurations.

4. The device of claim 1, wherein the applicator handle further comprises an identification circuit connected to determine a number of electrode needles in the electrode applicator and desired electrical signal parameters for the needle applicator.

5. The device of claim 1, wherein the power supply is a control module connected to the applicator handle to supply the at least one electrical signal and provide at least one of the following electrical treatment parameters to be used with the electrode applicator:

needle voltage setpoint, pulse length, pulse shape, a number of pulses, and switching sequence.

6. The device of claim 5, wherein the control module produces the at least one electrical signal according to a spacing of the needles in the electrode applicator.

7. The device of claim 5, wherein the control module produces the at least one electrical signal according to a number of the needles in the electrode applicator.

8. The device of claim 5, wherein a ratio of a voltage difference between two electrode needles and a spacing between the two electrode needles is in a range from about 10 V/cm to about 1300 V/cm.

9. The device of claim 1, wherein the pulses produced by the power supply have a pulse width from about 10 microsec to about 100 msec.

10. The device of claim 1, wherein at least one electrode needle in the electrode applicator is configured to transmit a liquid substance, having the selected molecules, to the biological sample and the applicator handle includes a liquid channel for delivering the liquid substance to the electrode applicator.

11. The device of claim 1, wherein each electrode needle comprises a base portion that is directly engaged to the electrode applicator and is covered with a layer of electrically insulating material and a desired portion of the tip portion that is exposed.

12. An electroporation device, comprising:

(a) an applicator handle having a first end configured to detachably engage a disposable needle array and operable to provide at least one electrical signal to the needle array when engaged, wherein the needle array has at least four electrode needles arranged relative to one another to form a desired array; and

(b) a control module connected to supply the at least one electrical signal to the applicator handle and provide at least one of the following electrical treatment parameters to the applicator handle configured to supply the signal to the electrode applicator when engaged;

an electrical voltage, pulse duration, pulse shape, a number of pulses, and switching sequence,

wherein, the engaged needle array is operable to generate and apply electrical pulses onto a biological sample comprising cells in electrical contact with the electrode needles in response to the at least one electrical signal and thereby electroporate selected molecules into cells of the sample without permanently damaging the cells.

13. The device of claim 12, wherein the control module controls the at least one electrical signal in such a way that a ratio of voltage between two electrode needles and a spacing between the two electrode needles is in a range from about 10 V/cm to about 1300 V/cm.

14. The device of claim 12, wherein the control module controls the at least one electrical signal in such a way that the pulses have a pulse width from about 10 microsec to about 100 msec.

15. The device of claim 12, wherein the applicator handle further includes at least one liquid channel configured to deliver a liquid substance that has the selected molecules to the needle array.

16. The device of claim 12, wherein each electrode needle comprises a base portion that is directly engaged to the needle applicator and is covered with a layer of electrically insulating material and a desired portion of the tip portion that is exposed.

17. An electroporation device, comprising:

(a) an electrode applicator having at least two opposing pairs of electrode needles arranged relative to one another to form a desired array, wherein each electrode needle comprises a base portion that is directly engaged to the needle applicator and is covered with a layer of electrically insulating material and a desired portion of a tip that is exposed;

(b) an applicator handle having a first end engaged to the electrode applicator and a second end positioned to receive at least one electrical signal from a power supply, the applicator handle configured to supply the at least one electrical signal to the electrode applicator, and

(c) a power supply to provide at least one electrical signal to the second end of the electrode applicator configured to supply the signal to the electrode applicator;

wherein when selected molecules are provided to a biological sample comprising cells, and at least two opposing pairs of electrodes are in electrical contact with the biological sample and are activated simultaneously, the electrode applicator is operable to provide separately applied pulses of high amplitude electric signals to said at least two opposing pairs of electrodes, but not all electrodes if there are more than two pairs of electrodes, simultaneously and proportionately to the distance between said electrodes of a pair to electroporate the selected molecules into cells of the sample without permanently damaging the cells.

18. The device of claim 17, wherein the electrode applicator includes a shield element that separates the applicator handle from the electrode applicator.

19. The device of claim 17, wherein the applicator handle further comprises an identification circuit connected to determine a number of electrode needles in the electrode applicator and desired electrical signal parameters for the needle applicator.

20. The device of claim 17, wherein the power supply is a control module connected to the applicator handle to supply the at least one electrical signal and provide at least one of the following electrical treatment parameters to be used with the electrode applicator:

needle voltage setpoint, pulse length, pulse shape, a number of pulses, and switching sequence.

21. The device of claim 17, wherein at least one electrode needle in the electrode applicator is configured to transmit a liquid substance that has the selected molecules to the biological sample and the applicator handle includes a liquid channel for delivering the liquid substance to the electrode applicator.