Method and system for invasive skin treatment

1. A system for applying RF energy to aplurality of discrete regions of skin, said system comprising:

an applicator comprising an electrode including flat parts and a plurality of protruding electrically conducting spaced apart pins terminated by sharp tips, the pins configured to penetrate throguh epidermis into the dermis and apply RF energy to one or more discrete tissue volumes that are completely located in the dermis, so as to heat the tissue volumes to a coagulation temperature;

a radio frequency energy source configured to apply radio frequency energy to the electrode with at least the plurality of protruding electrically conducting spaced apart pins to generate an electrical current in the dermis from the tips higher than from the flat parts of the electrode;

a control unit configured to allow input selected values of parameters of the RF energy to at least one located below skin tissue surface dermal tissue volume producing dermal tissue temperature increase to cause thermal collagen remodeling; and

tubes in flat regions between the protruding electrically conducting spaced apart pins for circulating a cooling fluid there through and cooling the electrode and the skin surface.

2. The system according to claim 1 , wherein the selected values of parameters are at least one of a group consisting of frequency, pulse duration and intensity of the RF energy.

3. The system according to claim 2 , wherein the radio frequency energy source is a voltage source configured to apply voltage pulses with pulse duration shorter than 200 ms to the conductive pins.

4. The system according to claim 1 wherein in order to avoid skin redness the sides of the pins are coated with insulating material.

5. The system according to claim 1 wherein the current conducting pins are spaced apart by a distance of at least 1 mm.

6. A method for heating a plurality of discrete dermis volumes to a coagulation temperature, said method comprising:

applying to skin surface an applicator comprising at least one electrode including flat parts and a plurality of protruding electrically conducting spaced apart pins terminated by sharp tips, the tips configured to penetrate through epidermis into dermis reaching a plurality of discrete volumes located in dermis;

applying a voltage to the at least one electrode with the plurality of protruding electrically conducting spaced apart pins to generate in the dermis an electrical current from the tips higher than from the flat parts of the electrode simultaneously heating a plurality of dermis volumes to a coagulation temperature; and

cooling the electrode and the skin surface by circulating a cooling fluid through tubes in the flat parts between the protruding electrically conducting spaced apart pins.

7. The method according to claim 1 , further comprising adjusting RF energy to selectively damage dermis volumes adjacent to the pins terminated by tips with high curvatures so that treatment of the dermis occurs simultaneously at a plurality of discrete dermis volumes.

8. The method according to claim 7 , wherein the selectively damaged dermal volumes located underneath skin surface are separated by not damaged volumes of dermal tissue.

9. The method according to claim 1 , wherein said volumes are completely located within the dermis below the skin surface.

10. The method according to claim 1 , wherein the volumes located below skin tissue surface do not include an epidermal tissue volume.

11. The method according to claim 1 , further comprising avoiding skin heating and redness around the pins by coating the sides of the pins with insulating material.

12. A method for invasive collagen remodeling with reduced skin redness, the method comprising:

applying to the skin an electrode including flat parts and a plurality of spaced apart protruding conducting pins terminated by sharp tips;

pressing the electrode such that protruding conducting pins terminated by sharp tips penetrate into the dermis;

supplying RF voltage to the electrode and treating the skin simultaneously in a plurality of discrete skin volumes located in the dermis;

cooling the electrode and the skin surface by circulating a cooling fluid through tubes in the flat parts between the protruding electrically conducting spaced apart pins; and

wherein location of the plurality of discrete skin volumes located in the dermis reduces skin redness occurring at the treated regions of the skin.