Objective:To make up a portable

economic drainage device to prevent the development of pocket hematoma and avoid the additional therapies of pocket hematoma.Methods:Between 2003 and 2006

a total of 265 devices were implanted at our institution.The 89 high-risk patients were determined by the predictors of hematoma occurrence（marasmatic elder

inevitable oral antiplatelet/anticoagulation therapy

venous pressure increased by other comorbidity

the deficiency of the clotting mechanism for hepatic diseases

or incognizable severe intraoperative bleeding）

and other 186 patients were included in non-high-risk group.The 89 high-risk patients were randomized into treatment and control subgroups by sortition.Surgical procedures differed only by the application of the portable

economic drainage device prior to wound closure in treatment subgroup.Results:The incidence of pocket hematoma was 4.3% in treatment subgroup

18.6% in control subgroup and 2.7% in non-high-risk group

leading to 2

6 and 3 patients’ prolonged hospitalization

respectively.The additional cost due to pocket hematoma was lower（1.5 times） in the treatment group compared to the control group.There wasn’t antidromic infection and delayed cure of the skin incision with the use of our drainage device within 6 months.Conclusion:Our portable drainage device was made up easily and quickly.It could decrease the total cost of hospitalization

did not increase the other adverse events and seemed to be suitable for such patients with a tendency to develop pocket hematoma undergoing the implantation of pectoral pacemakers

implantable cardioverter defibrillator

or cardiac resynchronization therapy.