Apparatus and methods are provided for use with a hole closure device that is configured to be deployed by expanding inside a subjects body. An insertion device includes an outer tube and an inner pushing element. The outer tube constrains the hole closure device from expanding, during insertion of the hole closure device into the subjects body. The pushing element causes at least a portion of the hole closure device to self expand by pushing the portion out of a distal end of the outer tube, by the pushing element being advanced distally with respect to the outer tube. A safety element is couplable to the pushing element and is configured to prevent the hole closure device from expanding, by preventing distal advancement of the pushing element with respect to the outer tube, when the safety element is coupled to the pushing element. Other applications are also described.
