SHORTWAVE DIATHERMY SHORT WAVE DIATHERMY Def SWD is

SHORT WAVE DIATHERMY § Def. : SWD is a modality that produces deep heating

§ Shortwave diathermy current freq. 10 – 100 MHz • (The shortest radiofrequency wave

• Modalities: • either continuous or pulsed (PSWD). • PSWD: application of series

• SWD: produce both deep and sup. Tissue heating, under certain controlled conditions

Types of Shortwave Diathermy • Induction Field • Capacitive Field

Induction Field Diathermy • Places the patient in the electromagnetic field • Current flowing

Capacitive Field Diathermy • Uses the patient’s tissues as a part of the circuit

TYPES OF ELECTRODES • Flexible pads: consist of metal electrode encased in rubber and

• Space plates: consist of a rigid metal electrode encased in • a

• Coil or cable electrode consists of a wire with plugs at either

• The monode : flat, rigid coil encased in plastic cover € electromagnetic

• The diplode : or drum electrode, consists of a flat coil electrode

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SHORTWAVE DIATHERMY

SHORT WAVE DIATHERMY § Def. : SWD is a modality that produces deep heating via conversion of electromagnetic energy to thermal energy. • The pattern of heat produced depend on: Freq. used. Type of SWD unit. Water content of the tissues.

§ Shortwave diathermy current freq. 10 – 100 MHz • (The shortest radiofrequency wave is used in therapeutic diathermy. ) • the commonly used in medical work having freq. of 27. 12 MHz with wavelength of 11 meters

• Modalities: • either continuous or pulsed (PSWD). • PSWD: application of series of short pulses of SWD so that short periods of SWD interrupted by gaps where there is no SWD. • The pt. receives lower dose of SWD energy if compared with continuous SWD applied of the same time. • The tissues will receive lower thermal load.

• SWD: produce both deep and sup. Tissue heating, under certain controlled conditions • it’s applied for 20 min at the max tolerable dose

Types of Shortwave Diathermy • Induction Field • Capacitive Field

Induction Field Diathermy • Places the patient in the electromagnetic field • Current flowing within the coil produces a rotating magnetic field • Magnetic field produces eddy currents in the tissues • Eddy currents cause friction that produce heat • Selectively heats muscle • Also referred to as: • – Magnetic field diathermy

Capacitive Field Diathermy • Uses the patient’s tissues as a part of the circuit • The tissues’ electrical resistance produces heat • Selectively heats skin – Muscle is heated via conduction from the adipose • Also referred to as “condenser field diathermy”

TYPES OF ELECTRODES • Flexible pads: consist of metal electrode encased in rubber and produce an electrostatic field.

• Space plates: consist of a rigid metal electrode encased in • a Perspex cover €electrostatic field.

• Coil or cable electrode consists of a wire with plugs at either end creates electromagnetic field.

• The monode : flat, rigid coil encased in plastic cover € electromagnetic field.

• The diplode : or drum electrode, consists of a flat coil electrode encased in a Perspex cover with two wings € electromagnetic field