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VSD Operation and Principle (II)

Can VSD be used after vascular repair surgery?

Answer: For patients with complex injury, VSD can be used to avoid wound infection and necrosis and increase operative success rate after vascular anastomosis. Negative pressure can be adjusted according to circumstances, and is suggested to be less than -120 mmHg for special areas.

How about is without central vacuum suction?

Answer: If there is without central vacuum suction, you can choose ordinary vacuum aspirator. The negative pressure should be maintained at -120 mmHg to -450 mmHg, in order to prevent element wear induced by long-term use of aspirator, and the element should be changed every 3 to4 hours. It is suggested to take designated vacuum aspirator, but not spring vacuum aspiration devices.

Can drainage tube in VSD materials be replaced by ordinary medical drainage tube?

Answer: No, drainage tube in VSD is made of special materials, which are hard and difficult to deform as resisting to higher negative pressure. Ordinary medical drainage tube cannot resist higher negative pressure, becomes deformity and blockage, and finally induce obstruction and operation failure.

Can VSD materials be replaced by gauze and ordinary sponge?

Answer: VSD indicates to vacuum sealing drainage. Clinical test is carried out for replacing VSD materials by gauze or ordinary sponge, but the efficacy is poor, and cannot achieve better curative efficacy. Wound excretion will be remained or obstruct drainage, so it is suggested not change VSD materials by gauze or other materials.

How about VSD materials are remained in human body?

Answer: VSD materials are made of special polyvinyl alcohol, and have good biocompatibility. They are seldom with obscission. Little VSD materials in human body cannot induce common complications of foreign matter residue. It should wash wound surface during operation, in order to prevent retention of foreign body.

How to preserve residual VSD materials?

Answer: VSD materials are disposable materials. It is not suggested to preserve VSD materials, in order to prevent infection.

 

What needs to notice for designing VSD materials?

Answer: Firstly, VSD materials should cover wound surface, in order to prevent wound exposure or insufficient drainage. The foam width between drainage tubes should be not more than 2-3 cm, in order to maintain sufficient negative pressure on foam. Multi-port drainage tube and lateral holes should be within foam, in order to avoid exposure and drainage tube blockage. Thin film should cover the healthy skin at 3 to 4 cm around the wound.

How about is VSD materials being placed for a long time and becoming dry?

Answer: Try to avoid materials being exposed in air for a long time. If the materials become dry and hard, please soak them in 0.9% sodium chloride solution for several minutes (note: do not soak in alcohol, and the materials will be dissolved with alcohol).

How long a VSD material can be used?

Answer: Disposable VSD can maintain effective drainage for 3 to 10 days, and is always removed or changed 5 to 7 days later (do not more than 10 days). It should determine specific use and change time according to wound condition.

What are the reasons for wound pain or discomfort during treatment?

Answer: These symptoms may be induced by higher negative pressure, and can be relieved by decreasing negative pressure. Please notice peripheral circulation. But the conditions of wound infection aggravation and vascular nervous system damage should be excluded. If necessary, please complete relevant examination by physician.

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