problem with patch clamp on the rat smooth muscle cell

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calciumcurrent
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problem with patch clamp on the rat smooth muscle cell

It is the first time I work on this kind of cell. I want to record the calcium current. I have try some times, but I can not record the current. If you are good at this kind of cell and work on them before, can you give some suggestion?  The pipette resistant ?  solution? how to get a nice seal?
I use the P2-P6 cells.  Thanks