Abstract: A tubular system is configured to transluminally deliver an implant comprising a tissue anchor having a coupling head and a distal helical tissue-engaging element, into a heart of a subject. The tissue anchor is slidable through a channel of the system, the channel being slidable within a catheter. An anchor driver is configured, while coupled to the coupling head of the tissue anchor, to drive the tissue anchor through the system and out the system's distal end, to anchor the tissue-engaging element to tissue of the heart. While a first electrode is in contact with the subject and a second electrode is inside the heart of the subject, a control unit receives an electrophysiological signal from the electrodes, and based on the electrophysiological signal, indicates a position of the second electrode inside the heart. Other embodiments are also described.

Abstract: An optoelectronic apparatus includes an array of emitters configured to emit beams of optical radiation. An optical substrate is mounted over the array. An optical metasurface is disposed on the optical substrate and configured to collimate and split each of the emitted beams into a respective group of collimated sub-beams, and to direct the collimated sub-beams toward a target to form a pattern of spots on the target.

Abstract: A stand comprises a track. A first handle is mountable on the stand such that the stand supports the first handle. A first catheter defines a first lumen, and is coupled to the first handle. A second handle is mountable on the stand proximally from the first catheter in a manner in which the stand also supports the second handle. A second catheter defines a second lumen, and is coupled to the second handle. The second catheter is extendable through the first lumen. A third handle is slidably mountable on the track proximally from the second handle, such that the third handle is axially slidable along the track. A third catheter defines a third lumen, and is coupled to the third handle. A distal end of the third catheter is advanceable out of the second lumen. Other embodiments are also described.

Abstract: An optoelectronic apparatus includes a substrate and first and second arrays of emitters disposed on the substrate and configured to emit respective first and second beams of optical radiation. The apparatus further includes an optical metasurface disposed on the substrate and configured to collimate and diffuse the first beams without diffusing the second beams, and an optical projection element, configured to intercept both the first and the second beams that have passed through the optical metasurface and to direct both the first and the second beams toward a target while focusing the second beams to form a pattern of spots on the target.