Fig. 2From: Effectiveness and safety of acupuncture for elderly overactive bladder population in Hong Kong: study protocol for a randomized controlled trialStructure of the Park Sham Device. Park Sham Device with sham needle and real needle. 1. Needle handle, 2. Guide tube, 3. Guide O-Ring, 4. Park tube, 5. Flange, 6. Double sided tape, 7. Skin 8. Dermis, 9. Muscle, 10. Dull tip of sham needle, 11. Sharp tip of real needle Back to article page