this is totally not laggy

code/modules/surgery/helpers.dm

@@ -34,7 +34,7 @@
 				continue
 			if(S.lying_required && !(M.lying))
 				continue
-			if(!S.can_start(user, M))
+			if(!S.can_start(user, M, I))
 				continue
 			for(var/path in S.target_mobtypes)
 				if(istype(M, path))
@@ -64,7 +64,7 @@
 				return
 			if(S.lying_required && !(M.lying))
 				return
-			if(!S.can_start(user, M))
+			if(!S.can_start(user, M, I))
 				return
 
 			if(S.ignore_clothes || get_location_accessible(M, selected_zone))

code/modules/surgery/surgery.dm

@@ -55,27 +55,26 @@
 	if(requires_tech)
 		. = FALSE
 
+	var/list/advanced_surgeries = list()
 	if(iscyborg(user))
 		var/mob/living/silicon/robot/R = user
 		var/obj/item/surgical_processor/SP = locate() in R.module.modules
 		if(SP)
-			if (replaced_by in SP.advanced_surgeries)
-				return .
-			if(type in SP.advanced_surgeries)
-				return TRUE
-
+			advanced_surgeries |= SP.advanced_surgeries
 
 	var/turf/T = get_turf(patient)
 	var/obj/structure/table/optable/table = locate(/obj/structure/table/optable, T)
-	if(table)
-		if(!table.computer)
-			return .
-		if(table.computer.stat & (NOPOWER|BROKEN))
-			return .
-		if(replaced_by in table.computer.advanced_surgeries)
-			return FALSE
-		if(type in table.computer.advanced_surgeries)
-			return TRUE
+	if(table?.computer && !CHECK_BITFIELD(table.computer.stat, NOPOWER|BROKEN))
+		advanced_surgeries |= table.computer.advanced_surgeries
+
+	if(istype(tool, /obj/item/surgical_drapes/advanced))
+		var/obj/item/surgical_drapes/advanced/A = tool
+		advanced_surgeries |= A.get_advanced_surgeries()
+
+	if(replaced_by in advanced_surgeries)
+		return FALSE
+	if(type in advanced_surgeries)
+		return TRUE
 
 /datum/surgery/proc/next_step(mob/user, intent)
 	if(step_in_progress)

code/modules/surgery/tools.dm

@@ -287,6 +287,26 @@
 	if(!attempt_initiate_surgery(src, M, user))
 		..()
 
+/obj/item/surgical_drapes/advanced
+	name = "smart surgical drapes"
+	desc = "A quite quirky set of drapes with wireless synchronization to the station's research networks, with an integrated display allowing users to execute advanced surgeries without the aid of an operating computer."
+	var/datum/techweb/linked_techweb
+
+/obj/item/surgical_drapes/advanced/Initialize(mapload)
+	. = ..()
+	linked_techweb = SSresearch.science_tech
+
+/obj/item/surgical_drapes/advanced/proc/get_advanced_surgeries()
+	. = list()
+	if(!linked_techweb)
+		return
+	for(var/subtype in subtypesof(/datum/design/surgery))
+		var/datum/design/surgery/prototype = subtype
+		var/id = initial(prototype.id)
+		if(id in linked_techweb.researched_designs)
+			prototype = SSresearch.techweb_design_by_id(id)
+			. |= prototype.surgery
+
 /obj/item/organ_storage //allows medical cyborgs to manipulate organs without hands
 	name = "organ storage bag"
 	desc = "A container for holding body parts."