ODP.NET

I want to pass a collection of blob as a parameter in the procedure.
Collection of simple types I pass this way:

OracleParameter variable = new OracleParameter();
variable.ParameterName = "IN_VARIABLE";
variable.OracleDbType = OracleDbType.Object;
variable.UdtTypeName = "TYPE_NT_TBL_N";
variable.Direction = ParameterDirection.Input;
variable.Value = new TableOfNumber { Value = variables.ToArray() };
cmd.Parameters.Add(variable);

How do I pass a collection of blob?