refines autoimplanter code, replaces CMO eye HUD augment in locker with single use eye HUD augment autoimplanter

code/game/objects/structures/crates_lockers/closets/secure/medical.dm

@@ -69,7 +69,7 @@
 	new /obj/item/weapon/storage/belt/medical(src)
 	new /obj/item/device/assembly/flash/handheld(src)
 	new /obj/item/weapon/reagent_containers/hypospray/CMO(src)
-	new /obj/item/organ/cyberimp/eyes/hud/medical(src)
+	new /obj/item/device/autoimplanter/cmo(src)
 	new /obj/item/weapon/door_remote/chief_medical_officer(src)
 
 /obj/structure/closet/secure_closet/animal

code/modules/surgery/organs/autoimplanter.dm

@@ -1,3 +1,5 @@
+#define INFINITE -1
+
 /obj/item/device/autoimplanter
 	name = "autoimplanter"
 	desc = "A device that automatically injects a cyber-implant into the user without the hassle of extensive surgery. It has a slot to insert implants and a screwdriver slot for removing accidentally added implants."
@@ -5,8 +7,20 @@
 	item_state = "walkietalkie"//left as this so as to intentionally not have inhands
 	w_class = 2
 	var/obj/item/organ/cyberimp/storedorgan
+	var/uses = INFINITE
+	var/one_use = 0//separate var, as a 2-use device can have 1 use remaining if used once but not be a single-use device
+
+/obj/item/device/autoimplanter/New()
+	..()
+	if(one_use)
+		uses = 1
+	if(storedorgan)
+		storedorgan.loc = src
 
 /obj/item/device/autoimplanter/attack_self(mob/user)//when the object it used...
+	if(!uses)
+		user << "<span class='warning'>[src] has already been used. The tools are dull and won't reactivate.</span>"
+		return
 	if(!storedorgan)
 		user << "<span class='notice'>[src] currently has no implant stored.</span>"
 		return
@@ -14,9 +28,16 @@
 	user.visible_message("<span class='notice'>[user] presses a button on [src], and you hear a short mechanical noise.</span>", "<span class='notice'>You feel a sharp sting as [src] plunges into your body.</span>")
 	playsound(get_turf(user), 'sound/weapons/circsawhit.ogg', 50, 1)
 	storedorgan = null
+	if(uses != INFINITE)
+		uses --
+	if(!uses)
+		desc = "[initial(desc)] Looks like it's been used up."
 
 /obj/item/device/autoimplanter/attackby(obj/item/I, mob/user, params)
 	if(istype(I, /obj/item/organ/cyberimp))
+		if(one_use && !storedorgan)
+			user << "<span class='notice'>[src] doesn't accept implants. It must be a single-use device.</span>"
+			return//prevents removing the intended implant to insert your own
 		if(storedorgan)
 			user << "<span class='notice'>[src] already has an implant stored.</span>"
 			return
@@ -34,3 +55,9 @@
 			user << "<span class='notice'>You remove the [storedorgan] from [src].</span>"
 			playsound(get_turf(user), 'sound/items/Screwdriver.ogg', 50, 1)
 			storedorgan = null
+
+/obj/item/device/autoimplanter/cmo
+	name = "medical HUD autoimplanter"
+	desc = "A single use autoimplanter that contains a medical heads-up display augment. A screwdriver can be used to remove it, but implants can't be placed back in."
+	storedorgan = new/obj/item/organ/cyberimp/eyes/hud/medical()
+	one_use = 1