Patent Publication Number: US-2020289158-A1

Title: Medical device

Description:
TECHNICAL FIELD 
     The present disclosure relates to a medical device, and more particularly, to a medical device which is inserted into the body by using an endoscope to perform the treatment such as tissue collection or medicine injection. 
     BACKGROUND ART 
     Generally, a medical endoscope (hereinafter, referred to as an endoscope) is inserted into a body so that the inside of the body may be seen, and recently, a medical device which is inserted into the body by using an endoscope for the treatment such as tissue collection or medicine injection has been disclosed, and such a medical device includes a fine needle aspiration device and an incision device. 
     Japanese Patent Laid-Open Publication No. 2013-538099 discloses the fine needle aspiration device including an injection needle, an injection needle tube which surrounds the injection needle, and an injection needle operating mechanism which moves the injection needle so that the needlepoint of the injection needle protrudes from the injection needle tube or is inserted into the injection needle tube. 
     Korean Patent No. 10-1717287 discloses a cock which communicates and shields the injection needle and a syringe of the fine needle aspiration device. 
     Korean Patent No. 10-1310371 discloses an incision device including a knife for cutting a surgical site, a knife tube which surrounds the knife, and a knife operating mechanism which moves the knife so that the cutting edge of the knife protrudes from the knife tube or is inserted into the knife tube. 
     However, such a conventional medical device has a problem in that an operation is inconvenient. 
     Specifically, the fine needle aspiration device disclosed in Japanese Patent Laid-Open Publication No. 2013-538099 includes a stopper which limits the length of the needlepoint of the injection needle protruding from the injection needle tube, and as the stopper is formed in a bolt manner, an operator is required to rotate the bolt in one direction to fix the stopper, and the operator is required to rotate the bolt in the opposite direction to release the stopper. Accordingly, there is a problem in that the operation of the stopper is cumbersome, and the time required for operating the stopper is increased. 
     Further, the cock disclosed in Korean Patent No. 10-1717287 includes a valve which opens and closes the passage between the injection needle and the syringe, and as the valve is formed in a rotating manner, the operator is required to rotate the valve in one direction to open the passage between the injection needle and the syringe, and the operator is required to rotate the valve in the opposite direction to close the passage between the injection needle and the syringe. Accordingly, there is a problem in that the operation of the cock is cumbersome, and the time required for operating the cock is increased. 
     Further, the incision device disclosed in Korean Patent No. 10-1310371 includes the stopper which limits the length of the cutting edge of the knife protruding from the knife tube, and as the stopper is formed in a bolt manner, the operator is required to rotate the bolt in one direction to fix the stopper, and the operator is required to rotate the bolt in the opposite direction to release the stopper. Accordingly, there is a problem in that the operation of the stopper is cumbersome, and the time required for operating the stopper is increased. 
     DISCLOSURE 
     Technical Problem 
     Accordingly, an object of the present disclosure is to provide a medical device capable of performing an operation simply. 
     Technical Solution 
     For achieving the object, the present disclosure includes a medical device which includes a fine needle aspiration device and an incision device which are inserted into a body by using an endoscope, and the fine needle aspiration device includes: an injection needle which is injected into a surgical site; an injection needle tube which surrounds the injection needle; a first limiting unit which limits the length of the needlepoint of the injection needle protruding from the injection needle tube; a syringe which is connected to the injection needle for tissue collection and medicine injection; and a second limiting unit which limits the connection between the injection needle and the syringe, the incision device includes: a knife configured to cut the surgical site; a knife tube which surrounds the knife; and a third limiting unit which limits the length of the cutting edge of the knife protruding from the knife tube, and at least one of the first limiting unit, the second limiting unit, and the third limiting unit is formed so that the limiting function is released when an external force is applied by an operator and the limiting function is restored when the external force is removed. 
     The fine needle aspiration device may further include an injection needle operating mechanism which moves the injection needle so that the needlepoint of the injection needle protrudes from the injection needle tube or is inserted into the injection needle tube, the injection needle operating mechanism may include an injection needle guide part which extends in one direction; a first gripping part which is coupled to the injection needle tube and is movable along a first injection needle guide part which is one end of the injection needle guide part; and a second gripping part which is coupled to the injection needle and is movable along a second injection needle guide part which is the other end of the injection needle guide part, and the first limiting unit may include a first stopper which fixes the first gripping part to the injection needle guide part; and a second stopper which prevents the second gripping part from being closer to the first gripping part than a predetermined position. 
     The first stopper may include a first housing which has a first through hole formed to penetrate in one direction and a first intersecting hole intersecting with the first through hole and is formed integrally with the first gripping part; a first core which is provided to be reciprocable in a first direction and a second direction which is the opposite direction of the first direction along the first intersecting hole and has a first communicating hole which is communicable with the first through hole; and a first spring which applies an elastic force to the first core in the second direction, and the first injection needle guide part may be inserted into the first through hole and the first communicating hole. 
     The first injection needle guide part may be formed with a plurality of first grooves along the extending direction of the injection needle guide part, the first core may include a first protrusion which protrudes from the first communicating hole and is insertable into any one of the plurality of first grooves and a first exposing part which is exposed to the outside of the first intersecting hole; when an external force is applied to the first exposing part, the first core may move in the first direction by the external force, and the first protrusion may be drawn out from the plurality of first grooves, such that the first gripping part and the first stopper are movable along the first injection needle guide part; and when the external force is removed, the first core moves in the second direction by the first spring, and the first protrusion is inserted into any one of the plurality of first grooves, such that the first gripping part and the first stopper may be fixed to the injection needle guide part. 
     The first groove may include a first groove first support surface which supports the first protrusion at the second gripping part side with respect to the first protrusion; and a first groove second support surface which supports the first protrusion at the opposite side of the first groove first support surface with respect to the first protrusion, the first groove first support surface may be formed perpendicular to the extending direction of the injection needle guide part, and the first groove second support surface may be formed to be inclined to the extending direction of the injection needle guide part so as to push the first protrusion to the outside of the first groove as the first groove second support surface moves away from the second gripping part. 
     The second stopper may include a second housing which has a second through hole formed to penetrate in one direction and a second intersecting hole intersecting with the second through hole and is provided between the first gripping part and the second gripping part; a second core which is provided to be reciprocable in a third direction and a fourth direction which is the opposite direction of the third direction along the second intersecting hole and has a second communication hole which is communicable with the second through hole; and a second spring which applies an elastic force to the second core in the fourth direction, and the second injection needle guide part may be inserted into the second through hole and the second communicating hole. 
     The second injection needle guide part may be formed with a plurality of second grooves along the extending direction of the injection needle guide part, the second core may include a second protrusion which protrudes from the second communicating hole and is insertable into any one of the plurality of second grooves and a second exposing part which is exposed to the outside of the second intersecting hole; when the external force is applied to the second exposing part, the second core moves in the third direction by the external force, and the second protrusion is drawn out from the plurality of second grooves, such that the second stopper is movable along the second injection needle guide part; and when the external force is removed, the second core moves in the fourth direction by the second spring, and the second protrusion is inserted into any one of the plurality of second grooves, such that the second stopper may be fixed to the injection needle guide part. 
     The second gripping part is movable along the second injection needle guide part separately from the second stopper, and the second gripping part may move toward the first gripping part and then may be blocked by the second stopper, thereby preventing the second gripping part from being closer to the first gripping part than a predetermined position. 
     The second groove may include a second groove first support surface which supports the second protrusion at the first gripping part side with respect to the second protrusion; and a second groove second support surface which supports the second protrusion at the opposite side of the second groove first support surface with respect to the second protrusion; the second groove first support surface may be formed perpendicular to the extending direction of the injection needle guide part; and the second groove second support surface may be formed to be inclined to the extending direction of the injection needle guide part so as to push the second protrusion to the outside of the second groove as the second groove second support surface moves away from the first gripping part. 
     The third limiting unit may include a knife guide part which is coupled to the knife tube and extends in one direction; and a third stopper which is coupled to the knife, is movable along the knife guide part, and is fixed to the knife guide part when being positioned at a predetermined position. 
     The third stopper may include a third housing which has a third through hole formed to penetrate in one direction and a third intersecting hole intersecting with the third through hole and is coupled to the knife; a third core which is provided to be reciprocable in a fifth direction and a sixth direction which is the opposite direction of the fifth direction along the third intersecting hole and has a third communicating hole which is communicable with the third through hole; and a third spring which applies an elastic force to the third core in the sixth direction, and the knife guide part may be inserted into the third through hole and the third communicating hole. 
     The knife guide part may be formed with a plurality of third grooves along the extending direction of the knife guide part; the third core may include a third protrusion which protrudes from the third communicating hole and is insertable into any one of the plurality of third grooves and a third exposing part which is exposed to the outside of the third intersecting hole; when the external force is applied to the third exposing part, the third core moves in the fifth direction by the external force, and the third protrusion is drawn out from the plurality of third grooves, such that the third stopper is movable along the knife guide part; and when the external force is removed, the third core moves in the sixth direction by the third spring, and the third protrusion is inserted into any one of the plurality of third grooves, such that the third stopper may be fixed to the knife guide part. 
     The third groove may include a third groove first support surface which supports the third protrusion at the knife side with respect to the third protrusion; and a third groove second support surface which supports the third protrusion at the opposite side of the third groove first support surface with respect to the third protrusion; the third groove first support surface may be formed perpendicular to the extending direction of the knife guide part; and the third groove second support surface may be formed to be inclined to the extending direction of the knife guide part so as to push the third protrusion to the outside of the third groove as the third groove second support surface moves away from the knife. 
     The syringe may include a hollow barrel which has a bore; and a plunger which reciprocates along the bore; the second limiting unit may include a fourth housing which has a fourth through hole formed to penetrate in one direction and a fourth intersecting hole intersecting with the fourth through hole; a fourth core which is provided to be reciprocable in a seventh direction and an eighth direction which is the opposite direction of the seventh direction along the fourth intersecting hole and has a fourth communicating hole which is communicable with the fourth through hole; and a fourth spring which applies an elastic force to the fourth core in the eighth direction; and one end of the fourth through hole may communicate with the syringe, and the other end of the fourth through hole may communicate with the injection needle. 
     The fourth core may include a fourth exposing part which is exposed to the outside of the fourth intersecting hole; when the external force is applied to the fourth exposing part, the fourth core moves in the seventh direction by the external force and the fourth communicating hole communicates with the fourth through hole, such that the syringe may communicate with the injection needle through the fourth through hole and the fourth communicating hole; and when the external force is removed, the fourth core moves in the eighth direction by the fourth spring, and the fourth communicating hole is shielded from the fourth through hole, thereby blocking the communication between the syringe and the injection needle. 
     Advantageous Effects 
     The medical device according to the present disclosure includes the fine needle aspiration device and the incision device which are inserted into the body by using the endoscope; the fine needle aspiration device includes the injection needle; the injection needle tube which surrounds the injection needle; the first limiting unit which limits the length of the needlepoint of the injection needle protruding from the injection needle tube; the syringe which is connected to the injection needle for tissue collection and medicine injection; and the second limiting unit which limits the connection between the injection needle and the syringe; the incision device includes the knife; the knife tube which surrounds the knife; and the third limiting unit which limits the length of the cutting edge of the knife protruding from the knife tube; and at least one of the first limiting unit, the second limiting unit, and the third limiting unit is formed so that the limiting function is released when an external force is applied by the operator and the limiting function is restored when the external force is removed, thereby performing the operation simply. 
    
    
     
       DESCRIPTION OF DRAWINGS 
         FIG. 1  is a system diagram illustrating a medical device according to an exemplary embodiment of the present disclosure. 
         FIG. 2  is a perspective diagram illustrating an injection needle, tube, injection needle operating mechanism, and first limiting unit of a fine needle aspiration device in the medical device illustrated in  FIG. 1 . 
         FIG. 3  is a cross-sectional diagram taken along the line I-I of  FIG. 2 . 
         FIG. 4  is an enlarged diagram of a portion A of  FIG. 3 . 
         FIG. 5  is a cross-sectional diagram illustrating a state where the limiting function of the first limiting unit illustrated in  FIG. 4  is released. 
         FIG. 6  is a cross-sectional diagram illustrating a syringe and a second limiting unit of the fine needle aspiration device in the medical device illustrated in  FIG. 1 . 
         FIG. 7  is a cross-sectional diagram illustrating a state where the limiting function of the second limiting unit illustrated in  FIG. 6  is released. 
         FIG. 8  is a perspective diagram illustrating an incision device and a third limiting unit in the medical device illustrated in  FIG. 1 . 
         FIG. 9  is a cross-sectional diagram taken along the line II-II of  FIG. 8 . 
         FIG. 10  is a cross-sectional diagram illustrating a state where the limiting function of the third limiting unit illustrated in  FIG. 9  is released. 
     
    
    
     BEST MODE 
     Hereinafter, a medical device according to the present disclosure will be described in detail with reference to the accompanying drawings. 
       FIG. 1  is a system diagram illustrating a medical device according to an exemplary embodiment of the present disclosure,  FIG. 2  is a perspective diagram illustrating an injection needle, tube, injection needle operating mechanism, and first limiting unit of a fine needle aspiration device in the medical device illustrated in  FIG. 1 ,  FIG. 3  is a cross-sectional diagram taken along the line I-I of  FIG. 2 ,  FIG. 4  is an enlarged diagram of a portion A of  FIG. 3 ,  FIG. 5  is a cross-sectional diagram illustrating a state where the limiting function of the first limiting unit illustrated in  FIG. 4  is released,  FIG. 6  is a cross-sectional diagram illustrating a syringe and a second limiting unit of the fine needle aspiration device in the medical device illustrated in  FIG. 1 ,  FIG. 7  is a cross-sectional diagram illustrating a state where the limiting function of the second limiting unit illustrated in  FIG. 6  is released,  FIG. 8  is a perspective diagram illustrating an incision device and a third limiting unit in the medical device illustrated in  FIG. 1 ,  FIG. 9  is a cross-sectional diagram taken along the line II-II of  FIG. 8 , and  FIG. 10  is a cross-sectional diagram illustrating a state where the limiting function of the third limiting unit illustrated in  FIG. 9  is released. 
     Referring to  FIG. 1 , a medical device according to an exemplary embodiment of the present disclosure may include a fine needle aspiration device which is inserted into a body by using an endoscope. 
     The fine needle aspiration device may include an injection needle  100  which is injected into a surgical site, an injection needle tube  200  which surrounds the injection needle  100  to protect the injection needle  100 , an injection needle operating mechanism  300  which moves the injection needle  100  so that the needlepoint of the injection needle  100  protrudes from the injection needle tube  200  or is inserted into the injection needle tube  200 , a first limiting unit  400  which limits the length of the needlepoint of the injection needle  100  protruding from the injection needle tube  200 , a syringe  500  which is connected to the injection needle  100  for tissue collection and medicine injection, and a second limiting unit  600  which limits the connection between the injection needle  100  and the syringe  500 . 
     First, referring to  FIGS. 2 to 5 , the injection needle  100 , the injection needle tube  200 , the injection needle operating mechanism  300 , and the first limiting unit  400  according to the present exemplary embodiment will be described. 
     That is, the injection needle  100  is formed of a hollow tube, and the needlepoint of the injection needle  100  is obliquely cut, such that a portion of the circumference of the injection needle  100  may be formed to be stood up. 
     Further, an injection hole which communicates the inside and the outside of the injection needle  100  may be formed on the cut surface of the needlepoint thereof. 
     The injection needle tube  200  may be formed of a hollow tube in which the inner diameter of the injection needle tube  200  is larger than or equal to the outer diameter of the injection needle  100 . 
     Further, the injection needle tube  200  may have one end of the injection needle tube  200  coupled to a first gripping part  320  to be described later, and may be fixed to the first gripping part  320  even if the injection needle  100  moves. 
     The injection needle operating mechanism  300  may include an injection needle guide part  310  which extends in one direction, the first gripping part  320  which is coupled to the injection needle tube  200  and is movable along a first injection needle guide part  312  which is one end of the injection needle guide part  310  and a second gripping part  330  which is coupled to the injection needle  100  and is movable along a second injection needle guide part  314  which is the other end of the injection needle guide part  310 . 
     The inject needle guide part  310  may include the first injection needle guide part  312  which guides the movement of the first gripping part  320 , the second injection needle guide part  314  which guides the movement of the second gripping part  330 , and a stepped part  316  which is interposed between the first injection needle guide part  312  and the second injection needle guide part  314 . 
     The first injection needle guide part  312  may be formed to extend in one direction from the stepped part  316 , may be inserted into the first gripping part  320 , and may be formed to be movable relatively to the first gripping part  320 . 
     A first groove (G 1 ), into which a first protrusion  414   b  of a first core  414  to be described later is inserted, may be formed in the outer circumferential surface of the first injection needle guide part  312 . 
     A plurality of first grooves (G 1 ) may be formed, and the plurality of first grooves (G 1 ) may be arranged at regular intervals along the extending direction of the first injection needle guide part  312 . 
     Further, each of the plurality of first grooves (G 1 ) may include a first groove first support surface (G 11 ) which supports the first protrusion  414   b  to be described later at the second gripping part  330  side with respect to the first protrusion  414   b  to be described later and a first groove second support surface (G 12 ) which supports the first protrusion  414   b  to be described later at the opposite side of the first groove first support surface (G 11 ) with respect to the first protrusion  414   b  to be described later. 
     The first groove first support surface (G 11 ) may be formed perpendicular to the extending direction of the first injection needle guide part  312 . 
     The first groove second support surface (G 12 ) may be formed to be inclined to the extending direction of the first injection needle guide part  312 . That is, the first groove second support surface (G 12 ) may be formed to push the first protrusion  414   b  to be described later to the outside of the first groove (G 1 ) as the first groove second support surface (G 12 ) moves away from the second gripping part  330 . 
     The second injection needle guide part  314  may be formed to extend in a direction opposite to the extending direction of the first injection needle guide part  312  from the stepped part  316 , may be inserted into the second gripping part  330 , and may be formed to be movable relatively to the second gripping part  330 . 
     A second groove (G 2 ), into which a second protrusion  424   b  of a second core  424  to be described later is inserted, may be formed in the outer circumferential surface of the second injection needle guide part  314 . 
     A plurality of second grooves (G 2 ) may be formed, and the plurality of second grooves (G 2 ) may be arranged at regular intervals along the extending direction of the second injection needle guide part  314 . 
     Further, each of the plurality of second grooves (G 2 ) may include a second groove first support surface (G 21 ) which supports the second protrusion  424   b  to be described later at the first gripping part  320  side with respect to the second protrusion  424   b  to be described later and a second groove second support surface (G 22 ) which supports the second protrusion  424   b  to be described later at the opposite side of the second groove first support surface (G 21 ) with respect to the second protrusion  424   b  to be described later. 
     The second groove first support surface (G 21 ) may be formed perpendicular to the extending direction of the second injection needle guide part  314 . 
     The second groove second support surface (G 22 ) may be formed to be inclined to the extending direction of the second injection needle guide part  314 . That is, the second groove second support surface (G 22 ) may be formed to push the second protrusion  424   b  to be described later to the outside of the second groove (G 2 ) as the second groove second support surface (G 22 ) moves away from the first gripping part  320 . 
     The stepped part  316  may be formed so that the outer diameter of the stepped part  316  is larger than the outer diameter of the first injection needle guide part  312  and the outer diameter of the second injection needle guide part  314 . 
     Meanwhile, the injection needle guide part  310  may be formed of a hollow tube so that the injection needle  100  penetrates the inside of the injection needle guide part  310  (more accurately, the first injection needle guide part  312 , the stepped part  316 , and the second injection needle guide part  314 ). 
     The first gripping part  320  may include a first handle  322  which is movable relatively to the first injection needle guide part  312  and an injection needle tube support part  324  configured to fix the injection needle tube  200  to the first handle  322 . 
     The first handle  322  may be formed of a hollow tube extending in one direction so that the first injection needle guide part  312  may be inserted into the first handle  322 . 
     The injection needle tube support part  324  may be fastened to the end of the first handle  322 , and fastened to the injection needle tube  200 . 
     The second gripping part  330  may include a second handle  332  which is movable relatively to the second injection needle guide part  314  and an injection needle support part  334  configured to fix the injection needle  100  to the second handle  332 . 
     The second handle  332  may be formed of a hollow tube extending in one direction so that the second injection needle guide part  314  may be inserted into the second handle  332 . 
     The injection needle support part  334  may be fastened to the end of the second handle  332 , and fastened to the injection needle  100 . 
     Further, the injection needle support part  334  may be formed to communicate the injection needle  100  with a pipe (P) to be described later. 
     The first limiting unit  400  may include a first stopper  410  which fixes the first gripping part  320  to the injection needle guide part  310  and a second stopper  420  which prevents the second gripping part  330  from being closer to the first gripping part  320  than a predetermined position. 
     The first stopper  410  is interposed between the first gripping part  320  and the stepped part  316 , and may include a first housing  412  which is formed integrally with the first gripping part  320 , the first core  414  which is formed to be reciprocable in the first housing  412 , and a first spring  416  which applies an elastic force to the first core  414 . 
     The first housing  412  may include a first through hole  412   a  which is formed to penetrate in one direction and a first intersecting hole  412   b  which intersects with the first through hole  412   a.    
     The first core  414  may be formed to be reciprocable in a first direction and a second direction which is the opposite direction of the first direction along the first intersecting hole  412   b.    
     Further, the first core  414  may include a first communicating hole  414   a  which is communicable with the first through hole  412   a , a first protrusion  414   b  which protrudes from the first communicating hole  414   a  and is insertable into any one of the plurality of first grooves (G 1 ), and a first exposing part  414   c  which is exposed to the outside of the first intersecting hole  412   b.    
     The first spring  416  may be formed of a coil spring which applies an elastic force to the first core  414  in the second direction. 
     Here, the first injection needle guide part  312  is inserted into the first through hole  412   a  and the first communicating hole  414   a , and in this state, in order for the first stopper  410  to be movable along the first injection needle guide part  312  together with the first gripping part  320 , and for the first core  414  to be movable along the first intersecting hole  412   b , the first through hole  412   a  may be formed of a substantially circular hole in which the inner diameter of the first through hole  412   a  is substantially equal to the outer diameter of the first injection needle guide part  312 , and the first communicating hole  414   a  may be formed of a long hole-shaped hole in which the length of the short axis is substantially equal to the outer diameter of the first injection needle guide part  312  and the length of the long axis is larger than the outer diameter of the first injection needle guide part  312 . 
     Further, the first protrusion  414   b  may be formed to correspond to the first groove (G 1 ). 
     The second stopper  420  is interposed between the stepped part  316  and the second gripping part  330 , and may include a second housing  422  which is formed separately from the second gripping part  330 , the second core  424  which is formed to be reciprocable in the second housing  422 , and a second spring  426  which applies an elastic force to the second core  424 . 
     The second housing  422  may include a second through hole  422   a  which is formed to penetrate in one direction and a second intersecting hole  422   b  which intersects with the second through hole  422   a.    
     The second core  424  may be formed to be reciprocable in a third direction and in a fourth direction which is the opposite direction of the third direction along the second intersecting hole  422   b.    
     Further, the second core  424  may include a second communicating hole  424   a  which is communicable with the second through hole  422   a , a second protrusion  424   b  which protrudes from the second communicating hole  424   a  and is insertable into any one of the plurality of second grooves (G 2 ), and a second exposing part  424   c  which is exposed to the outside of the second intersecting hole  422   b.    
     The second spring  426  may be formed of a coil spring which applies an elastic force to the second core  424  in the fourth direction. 
     Here, the second injection needle guide part  314  is inserted into the second through hole  422   a  and the second communicating hole  424   a , and in this state, in order for the second stopper  420  to be movable along the second injection needle guide part  314 , and for the second core  424  to be movable along the second intersecting hole  422   b , the second through hole  422   a  may be formed of a substantially circular hole in which the inner diameter of the second through hole  422   a  is substantially equal to the outer diameter of the second injection needle guide part  314 , and the second communicating hole  424   a  may be formed of a long hole-shaped hole in which the length of the short axis is substantially equal to the outer diameter of the second injection needle guide part  314  and the length of the long axis is larger than the outer diameter of the second injection needle guide part  314 . 
     Further, the second protrusion  424   b  may be formed to correspond to the second groove (G 2 ). 
     Next, the syringe  500  and the second limiting unit  600  according to the present exemplary embodiment will be described with reference to  FIGS. 6 and 7 . 
     That is, the syringe  500  may include a hollow barrel  510  having a bore  512  and a plunger  520  which reciprocates along the bore  512  and forms a compression and suction space (V) together with the hollow barrel  510 . 
     Here, a barrel hole  514  which communicates with the compression and suction space (V) may be formed at one end of the hollow barrel  510 , and the barrel hole  514  may communicate with or may be blocked from communicating with the pipe (P) which extends from the injection needle  100  by the second limiting unit  600 . 
     The second limiting unit  600  may include a fourth housing  610  which is interposed between the syringe  500  and the pipe (P), a fourth core  620  which is formed to be reciprocable in the fourth housing  610 , and a fourth spring  630  which applies an elastic force to the fourth core  620 . 
     The fourth housing  610  may include a fourth through hole  612  which is formed to penetrate in one direction and a fourth intersecting hole  614  which intersects with the fourth through hole  612 . 
     The fourth core  620  may be formed to be reciprocable in a seventh direction and in an eighth direction which is the opposite direction of the seventh direction along the fourth intersecting hole  614 . 
     Further, the fourth core  620  may include a fourth communicating hole  622  which is communicable with the fourth through hole  612  and a fourth exposing part  624  which is exposed to the outside of the fourth intersecting hole  614 . 
     The fourth spring  630  may be formed of a coil spring which applies an elastic force to the fourth core  620  in the eighth direction. 
     Here, one end  612   a  of the fourth through hole  612  may communicate with the barrel hole  514 ; the other end  612   b  of the fourth through hole  612  may communicate with the pipe (P); when the fourth core  620  moves in the seventh direction, the fourth communicating hole  622  may communicate with the one end  612   a  of the fourth through hole  612  and the other end  612   b  of the fourth through hole  612 ; and when the fourth core  620  moves in the eighth direction, the fourth communicating hole  622  may be formed to be shielded from the one end  612   a  of the fourth through hole  612  and the other end  612   b  of the fourth through hole  612 . 
     Meanwhile, referring to  FIGS. 1 and 8 to 10 , the medical device according to an exemplary embodiment of the present disclosure may further include an incision device which is inserted into the body by using an endoscope. 
     The incision device may include a knife  700  configured to cut a surgical site, a knife tube  800  which surrounds the knife  700 , and a third limiting unit  900  which limits the length of the cutting edge of the knife  700  protruding from the knife tube  800 . 
     The knife  700  may be formed to extend in one direction, one end of the knife  700  may be coupled to a third stopper  920  to be described later, and an incision part (hereinafter, referred to as a cutting edge) configured to cut the surgical site may be formed at the other end of the knife  700 . 
     The knife tube  800  may be formed of a hollow tube, one end of the knife tube  800  may be coupled to a knife guide part  910  to be described later, and a knife gate through which the cutting edge enters and exits may be formed at the other end of the knife tube  800 . 
     The third limiting unit  900  may include the knife guide part  910  which is coupled to the knife tube  800  and extends in one direction and a third stopper  920  which is coupled to the knife  700 , is movable along the knife guide part  910 , and is fixed to the knife guide part  910  when being positioned at a predetermined position. 
     The knife guide part  910  may be formed of a tube body which accommodates the knife  700  therein, and a third groove (G 3 ), into which a third protrusion  924   b  of a third core  924  to be described later is inserted, may be formed in the inner circumferential surface of the knife guide part  910 . 
     A plurality of third grooves (G 3 ) may be formed, and the plurality of third grooves (G 3 ) may be arranged at regular intervals along the extending direction of the knife guide part  910 . 
     Further, each of the plurality of third grooves (G 3 ) may include a third groove first support surface (G 31 ) which supports the third protrusion  924   b  to be described later at the knife  700  side with respect to the third protrusion  924   b  to be described later and a third groove second support surface (G 32 ) which supports the third protrusion  924   b  to be described later at the opposite side of the third groove first support surface (G 31 ) with respect to the third protrusion  924   b  to be described later. 
     The third groove first support surface (G 31 ) may be formed perpendicular to the extending direction of the knife guide part  910 . 
     The third groove second support surface (G 32 ) may be formed to be inclined to the extending direction of the knife guide part  910 . That is, the third groove second support surface (G 32 ) may be formed to push the third protrusion  924   b  to be described later to the outside of the third groove (G 3 ) as the third groove second support surface (G 32 ) moves away from the knife  700 . 
     The third stopper  920  may include a third housing  922  which is fastened to the knife  700 , a third core  924  which is formed to be reciprocable in the third housing  922 , and a third spring  926  which applies an elastic force to the third core  924 . 
     The third housing  922  may include a third through hole  922   a  which is formed to penetrate in one direction and a third intersecting hole  922   b  which intersects with the third through hole  922   a.    
     The third core  924  may be formed to be reciprocable in a fifth direction and a sixth direction which is the opposite direction of the fifth direction along the third intersecting hole  922   b.    
     Further, the third core  924  may include a third communicating hole  924   a  which is communicable with the third through hole  922   a , a third protrusion  924   b  which protrudes from the third communicating hole  924   a  and is insertable into any one of the plurality of third grooves (G 3 ), and a third exposing part  924   c  which is exposed to the outside of the third intersecting hole  922   b.    
     The third spring  926  may be formed of a coil spring which applies an elastic force to the third core  924  in the sixth direction. 
     Here, the knife guide part  910  may be inserted into the third through hole  922   a  and the third communicating hole  924   a , and in this state, in order for the third stopper  920  to be movable along the knife guide part  910 , and for the third core  924  to be movable along the third intersecting hole  922   b , the third through hole  922   a  may be formed to have the shape and size corresponding to the knife guide part  910 , and the third communicating hole  924   a  may be formed to have a long hole. 
     Further, the third protrusion  924   b  may be formed to correspond to the third groove (G 3 ). 
     Hereinafter, the operation and effects of the medical device according to the present exemplary embodiment will be described. 
     That is, the medical device according to the present exemplary embodiment may be injected into the surgical site under the induction of the endoscope to perform tissue collection, medicine injection, and incision in the surgical site. 
     Specifically, the fine needle aspiration device may be provided in a state where the first gripping part  320  and the second gripping part  330  are spaced apart from each other, such that the injection needle  100  is inserted into the injection needle tube  200 . 
     Further, the injection needle tube  200  into which the injection needle  100  is inserted may penetrate the inside of the endoscope so that the end of the injection needle tube  200  may face the surgical site. 
     Further, in a state where the first gripping part  320  is gripped with one hand of the operator to be fixed, the second gripping part  330  may be gripped with the other hand of the operator to move toward the first gripping part  320  until the second gripping part  330  is blocked by the second stopper  420 . Accordingly, the injection needle  100 , which moves together with the second gripping part  330 , may have the needlepoint of the injection needle  100  which protrudes from the end the injection needle tube  200 , and may be injected into the surgical site. 
     Here, the protruding length of the injection needle  100  may be adjusted according to a position of the first stopper  410  and a position of the second stopper  420  with respect to the injection needle guide part  310 . 
     Specifically, referring to  FIGS. 4 and 5 , the position of the first stopper  410  may be determined depending upon which one of the plurality of first grooves (G 1 ) the first protrusion  414   b  of the first core  414  is inserted into. That is, when an external force by the operator is applied to the first exposing part  414   c , the first core  414  may move in the first direction, and the first protrusion  414   b  may be drawn out from the plurality of first grooves (G 1 ). In this state, the first stopper  410  may move along the first injection needle guide part  312 . When the external force applied to the first exposing part  414   c  is removed after the first stopper  410  is positioned at the desired position on the first injection needle guide part  312 , the first core  414  moves in the second direction by the first spring  416 , and the first protrusion  414   b  is inserted into one of the plurality of first grooves (G 1 ), such that the first stopper  410  may be fixed to the first injection needle guide part  312 . 
     Further, the position of the second stopper  420  may be determined depending upon which one of the plurality of second grooves (G 2 ) the second protrusion  424   b  of the second core  424  is inserted into. That is, when the external force by the operator is applied to the second exposing part  424   c , the second core  424  may move in the third direction, and the second protrusion  424   b  may be drawn out from the plurality of second grooves (G 2 ). In this state, the second stopper  420  may move along the second injection needle guide part  314 . When the external force applied to the second exposing part  424   c  is removed after the second stopper  420  is positioned at the desired position on the second injection needle guide part  314 , the second core  424  moves in the fourth direction by the second spring  426 , and the second protrusion  424   b  is inserted into one of the plurality of second grooves (G 2 ), such that the second stopper  420  may be fixed to the second injection needle guide part  314 . 
     However, in the state where the first stopper  410  is fixed to any one position on the first injection needle guide part  312 , as the second stopper  420  is positioned adjacent to the stepped part  316  on the second injection needle guide part  314 , the stroke of the second gripping part  330  increases, and the stroke of the injection needle  100  which moves together with the second gripping part  330  increases, such that the protruding length of the injection needle  100  may increase. 
     Further, in the state where the second stopper  420  is fixed to any one position on the second injection needle guide part  314 , that is, in the state where the stroke of the injection needle  100  is determined, as the first stopper  410  is positioned adjacent to the stepped part  316  on the first injection needle guide part  312 , the injection needle tube  200  which moves together with the first stopper  410  is positioned adjacent to the stepped part  316 , such that the protruding length of the injection needle  100  may increase. 
     Meanwhile, in the state where the injection needle  100  is injected into the surgical site, the syringe  500  (more accurately, the pipe (P)) is connected to the injection needle  100 , such that tissue collection or medicine injection may be performed. That is, when the plunger  520  moves backward and negative pressure is applied to the compression and suction space (V) of the syringe, the tissue is sucked from the surgical site through the injection needle  100 , the pipe (P), the third stopper  920 , and the barrel hole  514 , and the sucked tissue may be stored in the compression and suction space (V) of the syringe  500 . Alternatively, when the plunger  520  moves forward and positive pressure is applied to the compression and suction space (V) of the syringe  500 , the medicine charged in the compression and suction space (V) of the syringe  500  may be injected into the surgical site through the barrel hole  514 , the third stopper  920 , the pipe (P), and the injection needle  100 . 
     Here, the suction amount and the injection amount by the syringe  500  may be adjusted by the second limiting unit  600 . 
     Specifically, referring to  FIGS. 6 and 7 , when the external force by the operator is applied to the fourth exposing part  624 , the fourth core  620  may move in the seventh direction, and the fourth communicating hole  622  may communicate with the one end  612   a  of the fourth through hole  612  and the other end  612   b  of the fourth through hole  612 . That is, the one end  612   a  of the fourth through hole  612  and the other end  612   b  of the fourth through hole  612  may communicate with each other through the fourth communicating hole  622 . Accordingly, the compression and suction space (V) of the syringe  500  may communicate with the injection needle  100  through the barrel hole  514 , the one end  612   a  of the fourth through hole  612 , the fourth communicating hole  622 , the other end of the fourth through hole  612 , and the pipe (P), and the suction amount and the injection amount may increase. 
     On the other hand, when the external force applied to the fourth exposing part  624  is removed, the fourth core  620  may move in the eighth direction by the fourth spring  630 , and the fourth communicating hole  622  may be shielded from the one end  612   a  of the fourth through hole  612  and the other end  612   b  of the fourth through hole  612 . That is, the communication between the one end  612   a  of the fourth through hole  612  and the other end  612   b  of the fourth through hole  612  may be blocked by the fourth core  620 . Accordingly, the compression and suction space (V) of the syringe  500  no longer communicates with the injection needle  100 , and the suction amount and the injection amount may decrease. 
     Meanwhile, the incision device may have the cutting edge of the knife  700  which is inserted into the body through the endoscope in the state where the cutting edge of the knife  700  protrudes from the knife tube  800  to cut the surgical site. 
     Here, the protruding length of the knife  700  may be adjusted according to the position of the third stopper  920  with respect to the knife guide part  910 . 
     Specifically, referring to  FIGS. 9 and 10 , the position of the third stopper  920  may be determined depending upon which one of the plurality of third grooves (G 3 ) the third protrusion  924   b  of the third core  924  is inserted into. That is, when the external force by the operator is applied to the third exposing part  924   c , the third core  924  may move in the fifth direction, and the third protrusion  924   b  may be drawn out from the plurality of third grooves (G 3 ). In this state, the third stopper  920  may move along the knife guide part  910 . When the external force applied to the third exposing part  924   c  is removed after the third stopper  920  is positioned at the desired position on the knife guide part  910 , the third core  924  moves in the sixth direction by the third spring  926 , and the third protrusion  924   b  is inserted into one of the plurality of third grooves (G 3 ), such that the third stopper  920  may be fixed to the knife guide part  910 . 
     However, in the state where the knife tube  800  is fixed to the knife guide part  910 , as the third stopper  920  is positioned adjacent to the knife tube  800  on the knife guide part  910 , the knife  700  may move together with the third stopper  920 , and the protruding length of the knife  700  may increase. 
     Here, in the medical device according to the present exemplary embodiment, the first limiting unit  400 , the second limiting unit  600 , and the third limiting unit  900  are formed so that the limiting functions are released when the external force is applied by the operator and the limiting functions are restored when the external force is removed, thereby enabling a simple and safe operation. 
     That is, as the first stopper  410  of the first limiting unit  400  which adjusts the protruding length of the injection needle  100  is formed so that the first stopper  410  may move when the operator presses the first exposing part  414   c  by the hand and the first stopper  410  is automatically fixed by the first spring  416  when the operator releases the finger pressing the first exposing part  414   c , the operator may easily operate the first stopper  410  by using only one finger (for example, thumb) of the hand gripping the first gripping part  320  or the first housing  412 . Further, upon the operation of the first stopper  410 , the fine needle aspiration device may be suppressed from being shaken. That is, unlike in the present exemplary embodiment, if the first exposing part  414   c  is formed in a pulling and then releasing manner, the operator is required to pull and then release the first exposing part  414   c  with at least two fingers of the hand after releasing the hand from the first gripping part  320  and the first housing  412 , and when the operator pulls and then releases the first exposing part  414   c , the first gripping part  320  and the first housing  412  are not supported by the operator&#39;s hand, such that the fine needle aspiration device may be shaken, thereby separating the injection needle tube  200  or causing injury around the surgical site. However, in the present exemplary embodiment, the first gripping part  320  or the first housing  412  may be supported by other fingers when the operator presses and then releases the first exposed part  414   c  with one finger, thereby suppressing the fine needle aspiration device from being shaken. 
     Further, as the second stopper  420  of the first limiting unit  400  is also formed so that the second stopper  420  may move when the operator presses the second exposing part  424   c  with the finger and the second stopper  420  is automatically fixed by the second spring  426  when the operator releases the finger pressing the second exposing part  424   c , the operator may easily operate the second stopper  420  by using only one finger of the hand which grips the second gripping part  330  or the second housing  422 . Further, upon the operation of the second stopper  420 , the fine needle aspiration device may be suppressed from being shaken. That is, the second gripping part  330  or the second housing  422  may be supported by other fingers when the operator presses and the releases the second exposing part  424   c  with one finger, thereby suppressing the fine needle aspiration device from being shaken. 
     Further, as the second limiting unit  600  which adjusts the suction amount and the injection amount by the syringe  500  is also formed so that the syringe  500  communicates with the injection needle  100  when the operator presses the fourth exposing part  624  with the finger and the communication between the syringe  500  and the injection needle  100  is automatically blocked by the fourth spring  630  when the operator releases the finger pressing the fourth exposing part  624 , the operator may easily operate the second limiting unit  600  by using only one finger of the hand which grips the fourth housing  610  or the hollow barrel  510 . Further, upon the operation of the second limiting unit  600 , the syringe may be suppressed from being shaken. That is, the fourth housing  610  or the hollow barrel  510  is supported with other fingers when the operator presses and then releases the fourth exposing part  624  with one finger, thereby suppressing the syringe  500  from being shaken. 
     Further, as the third stopper  920  of the third limiting unit  900  which adjusts the protruding length of the knife  700  is also formed so that the third stopper  920  may move when the operator presses the third exposing part  924   c  with the finger, and the third stopper  920  is automatically fixed by the third spring  926  when the operator releases the finger pressing the third exposing part  924   c , the operator may easily operate the third stopper  920  by using only one finger of the hand which grips the third housing  922 . Further, upon the operation of the third stopper  920 , the incision device may be suppressed from being shaken. That is, the third housing  922  may be supported by other fingers when the operator presses and then releases the third exposing part  924   c  with one finger, thereby suppressing the incision device from being shaken. 
     Meanwhile, in the case of the first limiting unit  400 , the first groove (G 1 ) of the first stopper  410  and the second groove (G 2 ) of the second stopper  420  may be formed so that the first stopper  410  and the second stopper  420  are difficult to move in a direction in which the first stopper  410  and the second stopper  420  are close to each other and are easy to move in a direction in which the first stopper  410  and the second stopper  420  are close to each other in a state where the first protrusion  414   b  and the second protrusion  424   b  are inserted into the first groove (G 1 ) and the second groove (G 2 ), respectively, thereby adjusting the protruding length of the injection needle  100  more simply and safely. 
     Specifically, as the first groove first support surface (G 11 ) is formed perpendicular to the extending direction of the first injection needle guide part  312 , the first groove first support surface (G 11 ) may strongly block the first protrusion  414   b  even if the first stopper  410  is pushed toward the second stopper  420 , thereby preventing the first stopper  410  from moving to be closer to the second stopper  420  than a predetermined position. Further, as the second groove second support surface (G 22 ) is formed perpendicular to the extending direction of the second injection needle guide part  314 , the second groove first support surface (G 21 ) may strongly block the second protrusion  424   b  even if the second stopper  420  is pushed toward the first stopper  410 , thereby preventing the second stopper  420  from moving to be closer to the first stopper  410  than a predetermined position. Accordingly, the injection needle  100  may be prevented from protruding further than a predetermined value from the injection needle tube  200 , thereby preventing damaging to the tissue. 
     On the other hand, as the first groove second support surface (G 12 ) is formed to be inclined to the extending direction of the first injection needle guide part  312 , the first groove second support surface (G 12 ) may push the first protrusion  414   b  to the outside of the first groove (G 1 ) when the first stopper  410  is pushed in a direction in which the first stopper  410  moves away from the second stopper  420 , thereby making it much easier to move the first stopper  410  in the direction in which the first stopper  410  moves away from the second stopper  420 . That is, the operator may easily move the first stopper  410  in the direction in which the first stopper  410  moves away from the second stopper  420  only by pulling the first stopper  410  in the direction in which the first stopper  410  moves away from the second stopper  420  by slightly pressing a first button part or even without pressing the first button part. Further, as the second groove first support surface (G 21 ) is formed to be inclined to the extending direction of the second injection needle guide part  314 , the second groove second support surface (G 22 ) may push the second protrusion  424   b  to the outside of the second groove (G 2 ) when the second stopper  420  is pushed in the direction in which the second stopper  420  moves away from the first stopper  410 , thereby making it much easier to move the second stopper  420  in the direction in which the second stopper  420  moves away from the first stopper  410 . That is, the operator may easily move the second stopper  420  in the direction in which the second stopper  420  moves away from the first stopper  410  only by pulling the second stopper  420  in the direction in which the second stopper  420  moves away from the first stopper  410  by slightly pressing a second button part or even without pressing the second button part. Here, when the first stopper  410  and the second stopper  420  move in the direction in which the first stopper  410  and the second stopper  420  move away from each other, the protruding length of the injection needle  100  decreases, such that there is no risk that the injection needle  100  damages the tissue and thus, there is no problem even if the first stopper  410  and the second stopper  420  are formed to easily move in the direction in which the first stopper  410  and the second stopper  420  move away from each other. 
     Meanwhile, in the case of the third limiting unit  900 , similar to the first limiting unit  400 , the third groove (G 3 ) of the third stopper  920  is formed so that the third stopper  920  is difficult to move toward the knife  700  and is easy to move to the opposite side of the knife  700  (hereinafter, the opposite direction of the knife  700 ) with respect to the third stopper  920  in a state where the third protrusion  924   b  is inserted into the third groove (G 3 ), thereby adjusting the protruding length of the knife  700  more simply and safely. 
     Specifically, as the third groove first support surface (G 31 ) is formed perpendicular to the extending direction of the knife guide part  910 , the third groove first support surface (G 31 ) may strongly block the third protrusion  924   b  even if the third stopper  920  is pushed toward the knife  700 , thereby preventing the third stopper  920  from moving to be closer to the knife  700  than a predetermined position. Accordingly, the knife  700  may be prevented from protruding further than a predetermined value from the knife tube  800 , thereby preventing damage to the tissue. 
     On the other hand, as the third groove second support surface (G 32 ) is formed to be inclined to the extending direction of the knife guide part  910 , the third groove second support surface (G 32 ) may push the third protrusion  924   b  to the outside of the third groove (G 3 ) when the third stopper  920  is pushed in the opposite direction of the knife  700 , thereby making it much easier to move the third stopper  920  in the opposite direction of the knife  700 . That is, the operator may easily move the third stopper  920  in the opposite direction of the knife  700  only by pulling the third stopper  920  in the opposite direction of the knife  700  by slightly pressing a third button part or even without pressing the third button part. Here, when the third stopper  920  moves in the opposite direction of the knife  700 , the protruding length of the knife  700  decreases, such that there is no risk that the knife  700  damages the tissue and thus, there is no problem even if the third stopper  920  is formed to easily move in the opposite direction of the knife  700 . 
     INDUSTRIAL APPLICABILITY 
     The present disclosure provides the medical device which may be inserted into the body by using the endoscope to perform the treatment such as tissue collection and medicine injection.