Medical handpiece having high frequency heating function

A medical handpiece having a high frequency heating function, comprising:

• a handpiece body portion;
• a needle unit including a needle holder installed outside a distal portion of the handpiece body portion and having a hollow portion, and a plurality of needles configured to protrude forward from a distal portion of the needle holder, wherein each needle has a hollow interior communicating with the hollow portion of the needle holder and a distal end configured to be inserted into a skin epidermal layer of a person to be treated;
• a high-frequency generator installed to electrically be coupled to the needle holder inside the handpiece body portion and configured to apply a high-frequency current to the plurality of needles to generate heat when the distal end of each needle is inserted into the epidermal layer;
• a drug delivery unit installed to communicate with the needle holder inside the handpiece body portion to deliver a drug to the plurality of needles;
• and
• a skin expansion member including a guide main body installed to protrude outward of the distal portion of the handpiece body portion and a pair of rotational expansion plates configured to expand a skin in both directions while rotating about a hinge shaft on both sides of a distal portion of the guide main body, and configured to pressure a skin layer of the person to be treated to which the plurality of needles are inserted to expand the skin layer in both directions,
• wherein the drug delivery unit includes:
• a syringe having a tubular cylinder communicating with the needle holder, a piston which is installed slidable in the cylinder and pressures the drug injected into the cylinder to discharge the drug to the needle holder, and a sealing material made of an elastic material installed on a distal end of the piston, and
• a syringe driver having a motor configured to a control signal applied to a control device of the medical handpiece having a high frequency heating function, and configured to move the piston of the syringe by an operation of the motor to inject the drug,
• wherein the syringe driver controls an output of the motor and moves the piston forward so that an amount of change in a volume inside the cylinder by a movement of the piston increases by a predetermined amount more than a volume of the drug to be injected into the skin, and operates the motor in a reverse direction to move the piston backward by a predetermined distance when the piston moves forward by a predetermined distance to eliminate a back pressure.