Anchor magazine

A system, comprising:

• an anchor-handling device comprising a housing, shaped to define a channel having an anchor-storage zone and a proximal opening;
• an anchor driver comprising an anchor-engaging head, a handle, and a shaft therebetween, wherein:
• the shaft is flexible and is configured to be transluminally advanced into a subject, and
• the anchor-engaging head is dimensioned to be advanceable through the proximal opening toward the anchor-storage zone;
• and
• a tissue anchor:
• stored in the anchor-storage zone,
• comprising (i) a coupling head configured to be locked to the anchor-engaging head while the tissue anchor is in the anchor-storage zone, and (ii) a tissue-engaging member configured to be driven into tissue of the subject using the anchor driver, and
• configured such that, while stored in the anchor-storage zone, the tissue anchor is movable out of the anchor-storage zone toward the proximal opening in response to a proximally-directed force being applied to the tissue anchor by the anchor driver,
• wherein the anchor-handling device comprises an element that serves as an indicator of movement of the tissue anchor out of the anchor-storage zone toward the proximal opening by the element moving in response to the proximally-directed force such that at least part of the element protrudes out of the housing.