diff --git a/server/gameserver/collision.cc b/server/gameserver/collision.cc
index c9ebf178..cb131ddb 100644
--- a/server/gameserver/collision.cc
+++ b/server/gameserver/collision.cc
@@ -26,6 +26,11 @@ bool Collision::CheckCC(Creature* a, Creature* b)
     return false;
 }
 
+bool Collision::CheckCC(Creature* a, float radius, Creature* b, float radis)
+{
+    return false;
+}
+
 bool Collision::CheckCB(Creature* c, Obstacle* b)
 {
     return false;
diff --git a/server/gameserver/collision.h b/server/gameserver/collision.h
index dd0b0e18..7aae6c25 100644
--- a/server/gameserver/collision.h
+++ b/server/gameserver/collision.h
@@ -10,6 +10,7 @@ class Collision
     static bool CheckBullet(IBullet* bullet, Creature* c);
     static bool CheckBullet(IBullet* bullet, Entity* c);
     static bool CheckCC(Creature* a, Creature* b);
+    static bool CheckCC(Creature* a, float radius, Creature* b, float radis);
     static bool CheckCB(Creature* c, Obstacle* b);
 
     /*
diff --git a/server/gameserver/roomobstacle.cc b/server/gameserver/roomobstacle.cc
index fcbd2d02..7c5d58dd 100644
--- a/server/gameserver/roomobstacle.cc
+++ b/server/gameserver/roomobstacle.cc
@@ -817,12 +817,13 @@ void RoomObstacle::ActiveMedicalStation()
                       if (master.Get()->team_id == hum->team_id &&
                           !hum->dead
                           ) {
-                          if (IntersectCircleCircle(
-                                                    GetPos().ToVec2(),
-                                                    SkillHelper::GetYlzRange(skill_meta),
-                                                    hum->GetPos().ToVec2(),
-                                                    hum->GetRadius()
-                                                    )) {
+                          if (Collision::CheckCC
+                              (
+                               this
+                               SkillHelper::GetYlzRange(skill_meta),
+                               hum,
+                               hum->GetRadius()
+                               )) {
                               target_list.insert(hum);
                           }
                       }
diff --git a/server/gameserver/types.cc b/server/gameserver/types.cc
index 9efb33b9..689c0b08 100644
--- a/server/gameserver/types.cc
+++ b/server/gameserver/types.cc
@@ -15,18 +15,6 @@ float Position::ManhattanDistance2D(const Position& target_pos) const
     return ToVec2().ManhattanDistance(target_pos.ToVec2());
 }
 
-a8::Vec2 Position::CalcDir2D(const Position& target_pos) const
-{
-    return a8::Vec2(target_pos.x, target_pos.z) - a8::Vec2(x, z);
-}
-
-void Position::FromVec3(const a8::Vec3 v)
-{
-    x = v.x;
-    y = v.y;
-    z = v.z;
-}
-
 void Position::FromGlmVec3(const glm::vec3 v)
 {
     x = v.x;
@@ -34,14 +22,6 @@ void Position::FromGlmVec3(const glm::vec3 v)
     z = v.z;
 }
 
-a8::Vec2 Position::ToVec2() const
-{
-    a8::Vec2 v2;
-    v2.x = x;
-    v2.y = z;
-    return v2;
-}
-
 glm::vec3 Position::ToGlmVec3() const
 {
     glm::vec3 v;
diff --git a/server/gameserver/types.h b/server/gameserver/types.h
index 02823c9e..cea34cd9 100644
--- a/server/gameserver/types.h
+++ b/server/gameserver/types.h
@@ -70,14 +70,10 @@ struct Position
     float Distance2D2(const Position& pos) const;
     float DistanceGlmVec3(const glm::vec3& v) const;
     float ManhattanDistance2D(const Position& target_pos) const;
-    a8::Vec2 CalcDir2D(const Position& target_pos) const;
     glm::vec3 CalcDir(const Position& target_pos) const;
 
-    void FromVec3(const a8::Vec3 v);
-
     void FromGlmVec3(const glm::vec3 v);
 
-    a8::Vec2 ToVec2() const;
     glm::vec3 ToGlmVec3() const;
 
     const Position& AddGlmVec3(const glm::vec3& v);