Devices descending from K171804

3 later devices reach Zap-X Radiosurgery System through their predicates, nearest generation first.

Generation	Number	Device	Applicant	Decided	Own descendants	Recalls
+1	K183698	Zap-X Radiosurgery System	Zap Surgical Systems	2019	2	—
+2	K211663	Zap-X Radiosurgical System	Zap Surgical Systems, Inc.	2021	1	2
+3	K250392	ZAP-X Radiosurgery System (ZAP-X)	Zap Surgical Systems, Inc.	2025	0	—