④ that cause deformation of the stent from the stent platform solder balls could not match with the steel mesh, resulting in leakage when the brush paste
(4) From the bracket deformation learned that the tin ball for the bracket platform failed to match the steel mesh hole, resulting in a leakage when brushing tin paste
④ It is known from the deformation of the support that the solder ball is the support platform, which fails to match with the steel mesh, resulting in the leakage of solder paste when brushing<br>