What is the given below device used for?

Ans. B. Pneumatic compression stockings to prevent DVTDeep vein thrombosis* Most common cause: Hospital admission for medical or surgical conditions* Most common site: Calf veins (Soleal veins)* E-Thrombosis: Thrombosis developing in people sitting at their computer for long times* Bilateral deep vein thrombosis seen in 30% cases.Clinical features:* Pain and swelling in calf region is the most common presentation* Increased temperature in local siteDiagnosis:* D-dimer measurement* Duplex ultrasound is the IOCTreatment:* Mechanical- Early ambulation- Most common method used: Pneumatic compression devices* Pharmacological- Unfractionated heparin (conventional) needs monitoring with activated PTT- Low-molecular-weight heparin (LMWH)