JP4674689B2 - Syringe pump - Google Patents

Description

  The present invention relates to a syringe pump that injects a medical solution in a syringe into a living body by driving a pusher of the syringe, and enables mounting of a plurality of types of syringes having different outer diameters, as well as the flange portion of the pusher. The present invention relates to a syringe pump that can reliably detect mounting.

  2. Description of the Related Art Conventionally, a syringe pump has been used as a device for injecting a predetermined flow rate of a medical solution into a living body. This syringe pump injects a drug solution in a syringe into a living body at a predetermined flow rate by inserting a pusher into an outer cylinder of a syringe attached to the pump body and moving the pusher with a driving means such as a motor. Is.

  When using such a syringe pump, it is required from the viewpoint of safety that the chemical liquid is surely injected at an appropriate flow rate, and for this purpose, it is necessary to accurately mount the syringe at a predetermined position. It is necessary to inject chemicals.

  As a conventional example in which a syringe pump is appropriately mounted in this manner, there is Patent Document 1. As shown in FIG. 12 or FIG. 13, the syringe pump of this document includes a moving member 54 for moving a flange portion 53 of a pusher 52 inserted into an outer cylinder of the syringe, and the moving member 54 includes a main body portion. A pair of arm members 56 and 56 that are supported by 55 so as to be opened and closed and are always urged in a closing direction, and the flange portion 53 of the pusher 52 is attached to the main body portion 55 as the arm members 56 and 56 close. And a projection 57 to be pressed to the side.

  In such a configuration, a clutch lever 58 is provided at the fulcrum of the pair of arm members 56, 56, and the pair of arm members 56, 56 are opened by pushing the clutch lever 58 with a fingertip, and the flange portion 53 of the pusher 52. Are pressed and held by the projections 57 of the arm members 56 and 56, respectively.

Further, when the flange portion 53 of the pusher 52 is mounted in this way, the flange portion 53 of the pusher 52 is attached to the detection pin 59 provided so as to protrude from the surface of the main body portion 55 between the pair of arm members 56, 56. It is detected that the flange portion 53 of the pusher 52 is held by hitting.
JP 2005-52367 A

  By the way, in the structure of said patent document 1, in order to open a pair of arm members 56 and 56, the operation which pushes the clutch lever 58 with a finger | toe is required, Therefore holding a syringe in one hand and the other hand In order to attach the syringe, it is necessary to use both hands simultaneously, such as pressing the clutch lever 58.

  Further, since the flange portion 53 of the pusher 52 needs to be mounted between the main body portion 55 and the pair of arm members 56 and 56 while the clutch lever 58 is being pressed with one hand, the operation is troublesome. In addition, if the mounting timing goes wrong, there is a risk of misunderstanding that the mounting is completed in a state where the flange portion 53 of the pusher 52 is applied to the outside of the pair of arm members 56, 56. However, in this state, the detection pin 59 does not operate and a proper mounting detection result cannot be obtained. However, if the detection pin 59 is operated due to some malfunction, it is determined that the mounting is proper and incomplete injection of the chemical solution is performed. Will be performed.

  The present invention relates to a syringe pump that injects a medical solution in a syringe into a living body by driving a pusher of the syringe as described above, and enables mounting of a plurality of types of syringes having different outer diameters, An object of the present invention is to provide a syringe pump in which the flange portion of the pusher is attached by one-touch operation of one hand and proper attachment detection can be reliably performed.

In order to achieve the above object, a syringe pump according to claim 1 of the present invention is equipped with a pump body for mounting an outer cylinder of a syringe containing a chemical solution and a flange portion of a pusher inserted into the outer cylinder. In the syringe pump having a feed carriage adapted to move the pusher, the feed carriage rotates with a gap between the receiving portion formed inside the carriage body via the groove and the inside of the groove. The left and right movable wings are pivotally supported, and the inner sides of the left and right movable wings have shapes that engage with the outer periphery of the flange portion of the pusher and extend upward from each other. In addition, each movable wing has a locking portion whose upper ends protrude in a downwardly inclined manner toward each other , and these movable wings open and close at the same time when the racks formed on both sides mesh with each other, Always close the movable wing And a rotor fixed to a guide shaft connected to a shaft portion of one movable blade to operate a switch provided on the pump body side by the operation of the movable blade. has opened the movable vanes of the right and left by a flange portion of the push rod on drop from above between the left and right movable vanes in a closed Te in the groove of the feed carriage, with said receiving portion At the same time as holding the neck of the pusher, the flange of the pusher is locked in a state of being gripped by the left and right movable wings, and the rotation of the guide shaft is transmitted along with the movement of the movable wings at this time. The rotor operates a switch in the pump main body to detect that the flange portion of the pusher is properly mounted in the groove of the feed carriage.

The syringe pump according to claim 2 of the present invention is the syringe pump according to claim 1 , wherein the pump main body is provided with a clamp lever for holding the outer cylinder of the syringe mounted at a predetermined location according to different diameters. Features.

Furthermore, the syringe pump according to claim 3 of the present invention is the syringe pump according to claim 1 or 2 , wherein the syringe is inserted into an engagement groove provided in the pump body when the outer cylinder of the syringe is attached to a predetermined portion of the pump body. And a sensor that operates in response to a descending operation of a mover provided in the engagement groove so as to be movable up and down. When the flange of the outer cylinder of the syringe is inserted into the engagement groove, the syringe is properly mounted at a predetermined position of the pump body by detecting that the mover has been lowered by the sensor. It is characterized in that it is detected.

  According to the syringe pump of the present invention, the flange portion of the pusher is dropped into the groove of the feed carriage from above and the neck portion of the pusher is held by the receiving portion. Therefore, it is possible to mount a plurality of types of syringes having different outer diameters and to mount the flange portion of the pusher by one-touch operation with one hand.

  Further, as described above, the rotation of the guide shaft is transmitted to the rotor fixed to the guide shaft in accordance with the operation of the movable blade when the outer periphery of the flange portion of the pusher is gripped, and the pump body is rotated by the rotation of the rotor. By operating the micro switch, it is possible to detect that the flange portion of the pusher is properly mounted in the groove of the feed carriage, and it is possible to inject the chemical liquid safely and accurately.

  In addition, a sensor that operates in response to the lowering movement of the mover provided to move up and down is provided inside the engagement groove provided in the pump body, and the flange portion of the outer cylinder of the syringe is inserted into the engagement groove. By detecting by the sensor that the mover has been lowered when worn, it is possible to detect that the syringe is properly attached to a predetermined portion of the pump body, and the flange portion of the outer cylinder of the syringe It is possible to eliminate the situation that the pump body is completely disengaged from the engaging groove of the pump body, and coupled with the function of detecting that the flange portion of the pusher is properly installed in the groove of the feed carriage, It is possible to further improve the safety management in mounting and use.

  Embodiments of the present invention will be described below with reference to the drawings.

  As shown in FIG. 1, the syringe pump 1 of this embodiment is equipped with a pump body 3 for mounting an outer cylinder 2 of a syringe containing a chemical solution and a flange portion 5 of a pusher 4 inserted into the outer cylinder 2. And a feed carriage 6 for moving the pusher 4.

  The pump main body 3 of the syringe pump 1 will be described. As shown in FIG. 1, the pump main body 3 is composed of a rectangular parallelepiped case 7, and an upper portion of the cylinder main body holding portion 8 is formed in the upper portion along the longitudinal direction. Is provided. An engagement groove 7 a into which the flange portion SF of the outer cylinder 2 is inserted is formed at the inner end of the outer cylinder holding portion 8.

  Further, as shown in FIG. 4, the outer cylinder holding portion 8 has a shape recessed in a curve so as to hold a part of the outer diameter of the outer cylinder 2 of the small syringe S <b> 1, and such a recess-shaped separation. Since the tops 9 and 9 are formed in a gentle slanted shape, the outer cylinder 2 of the large syringe S2 and the syringes of various outer diameters therebetween are held at two spaced locations (tops 9 and 9). It becomes possible to do.

  As shown in FIG. 1 or 4, the pump body 3 is provided with a clamp lever 10 in the vicinity of the outer cylinder holding portion 8. As shown in FIG. 4, the clamp lever 10 is fixed to the upper end of the clamp shaft 12 that is constantly biased downward by a coil spring 11 provided in the pump body 3. By pulling up against the spring force of 11, the height of the clamp lever 10 can be adjusted according to the change in the diameter of the outer cylinder 2 of the syringe installed in the outer cylinder holding portion 8. Therefore, the clamp lever 10 can hold the outer cylinder 2 of a plurality of types of syringes having different outer diameters downward and hold them in a fixed state.

  Even when the outer cylinder 2 of the syringe is held in a fixed state by the clamp lever 10, the outer cylinder 2 of the syringe may not be mounted in an appropriate state. This is because the clamp lever 10 can be held even when the flange portion SF of the outer cylinder 2 of the syringe is completely detached from the engagement groove 7 a of the pump body 3. Therefore, in order for the syringe outer cylinder 2 to be properly held at a predetermined position of the pump body 3, the flange portion SF of the syringe outer cylinder 2 is formed in the engagement groove 7a of the pump body 3 as shown in FIG. It is a precondition that it is installed.

  For this reason, in the present embodiment, as shown in FIGS. 9 to 11, a sensor that operates in response to a lowering operation of a movable element 35 provided in the engagement groove 7 a of the pump body 3 so as to be movable up and down. A microswitch MS is provided. In this embodiment, as shown in FIG. 11, the movable element 35 is a sensor terminal that faces upward at both parts spaced apart in the engagement groove 7 a (see FIG. 9) provided at the inner end of the pump body 3. 36 and 36 are provided, and these sensor terminals 36 and 36 are connected by a connecting member 37, and a sensor shaft 38 is provided so as to hang down at the lower center of the connecting member 37. The sensor shaft 38 is inserted into a hole 41 a of a support plate 41 fixed to the end of the pump body 3 with a screw 42 in a state of being elastically projected by the coil spring 39, and is attached to the lower end of the sensor shaft 38. The shaft terminal 40 is fixed. With such a configuration, the sensor terminals 36, 36, the connecting member 37, and the sensor shaft 38 on both sides are integrally formed, and can swing and move up and down while being biased upward by the coil spring 39. .

  Further, a micro switch MS is provided at a position in contact with the shaft terminal 40 at the lower end portion of the sensor shaft 38, and the shaft terminal 40 moves up and down as the sensor shaft 38 moves up and down. It can be turned off.

  By the way, the flange portion SF of the outer cylinder 2 of the syringe is not circular, but has a shape in which each side of the rectangle is curved as shown in FIG. Even when it is inserted into the engagement groove 7a (see FIG. 9) of the main body 10, at least one of the sensor terminals 36 is pushed down, so that the entire movable element 35 can be lowered. As a result, the shaft terminal 40 is lowered together with the sensor shaft 38, and the microswitch MS is turned ON, so that the flange portion SF of the outer cylinder 2 of the syringe is properly inserted into the engagement groove 7a of the pump body 3. Can be detected.

  As shown in FIG. 2, the pump body 3 is fixed to the base 13 of the apparatus with screws, and a motor 14 is fixed to the lower portion of the case 7 of the pump body 3 as shown in FIGS. Yes.

  Inside the pump body 3, there is provided a pulley 18 provided in parallel with a pulley 16 provided on the rotating shaft 15 of the motor 14 and coupled to an end of a long feed screw 17. By connecting 18 with a belt 19, the rotational force of the motor 14 is transmitted to the feed screw 17. A collet chuck is used as the feed screw 17, and the feed nut 20 provided on the outer periphery of the feed screw 17 is moved in the axial direction by rotation of the feed screw 17, but a half clutch or the like may be used instead. .

  As shown in FIG. 3, the feed screw 17 is extended in the direction of the feed carriage 6 in the pump body 3, and the feed nut 20 moves in the axial direction within the range of the length of the feed screw 17. The pipe-shaped feed shaft 21 whose end is coupled to the feed nut 20 is moved in the axial direction. In the pump body 3, a micro switch SW 1 is provided at a position for restricting the movement limit of the feed nut 20, and the pusher 4 inserted into the outer cylinder 2 of the syringe set in the outer cylinder holding portion 8. The limit position of the pressing operation can be detected and the motor 14 can be stopped.

  The feed shaft 21 is formed in a pipe shape having an outer diameter that surrounds the outer periphery of the feed screw 17 and extends outward from the pump body 3 as shown in FIG. Is coupled to the lower part of one side of the feed carriage 6.

  The feed carriage 6 is arranged with the inner surface of the carriage body 23 facing the pump body 3 as shown in FIG. 2, and a groove 24 is provided inside the carriage body 23 as shown in FIG. The receiving part 25 formed in this way is provided. The receiving portion 25 has a shape formed by forming a U-shaped 25b having a smaller width at the bottom of the U-shaped 25a that is open upward, and in the vicinity of the flange portion 5 of the pusher 4 as shown in FIG. The neck portion 4a having a cross shape is supported.

In addition, a pair of movable blades 26a and 26b are provided in the groove 24 of the feed carriage 6 so as to be pivotally supported with a space left and right. The shaft of the movable blade 26a is constituted by a guide shaft 29 described later, and the shaft of the movable blade 26b is constituted by a shaft member 22. Both movable wings 26a and 26b have substantially the same shape, and the inside of each of the movable wings 26a and 26b has a shape that locks the outer periphery of the flange portion 5 of the pusher 4 and extends upward from each other. The movable wings 26a, 26b are formed with locking portions 27, 27 whose upper ends protrude inwardly from each other . The left and right movable blades 26a and 26b are configured to open and close simultaneously when racks 28 and 28 formed at both contact portions mesh with each other.

  Further, the outer end portion of the guide shaft 29 constituting the shaft portion of the movable blade 26a on one side is inserted into the through hole 23a of the carriage main body 23, and as shown in FIG. This portion is fixed to the hole 30a of the stator 30, and the stator 30 is fixed to the base 13 of the apparatus with screws 13a.

  On the other hand, the inner end portion of the guide shaft (with surface) 29 is extended into the pump body 3, and a rotor 31 is coupled to the end portion as shown in FIG. The rotor 31 has an extension piece 31 a extending outward, and the other end of the spring 32 supported at one end by the depression 31 b of the extension piece 31 a is locked to the depression 3 a at the top of the pump body 3. Therefore, the elastic force of the spring 32 is always applied. The elastic force generated by the spring 32 is transmitted to the movable blade 26a through the guide shaft 29, and the left and right movable blades 26a and 26b are engaged with each other by both racks 28 and 28 as described above. Thus, the left and right movable blades 26a and 26b on the feed carriage 6 side are always urged in the closing direction.

  Further, as shown in FIG. 8, the rotor 31 fixed to the guide shaft (with surface) 29 has a right angle portion 31 c around the shaft and is attached to the inside of the pump body 3. The rotation angle of the guide shaft (with surface) 29 is regulated by applying the tip of the screw 34 screwed into the metal fitting 33 to the right angle portion 31 c of the rotor 31.

  Further, the rotor 31 of the guide shaft (with surface) 29 is in contact with a micro switch SW <b> 2 provided inside the pump body 3. With such a configuration, the rotation of the guide shaft 29 is transmitted to the rotor 31 by the operation of the movable blades 26 a and 26 b that are operated when the flange portion 5 of the pusher 4 is mounted in the groove 24 of the feed carriage 6. The micro switch SW2 on the pump body 3 side can be operated, and it is possible to determine that the flange portion 5 of the pusher 4 has been accurately mounted in the groove 24 of the feed carriage 6.

  With the above configuration, as shown in FIG. 1, after the flange portion SF of the outer cylinder 2 of the syringe is mounted in the engagement groove 7a provided at the inner end of the outer cylinder holding portion 8 of the pump body 3, the syringe The crank lever 10 is rotated according to the outer diameter of the outer cylinder 2 to be locked.

Then, as shown in FIGS. 6 and 7, the right and left movable blade 26a which is in a closed state like groove within 24 of the carriage 6 sends a flange portion 5 of the pusher 4 in a state in which stretched from the outer cylinder 2 of the syringe, The flange portion 5 of the pusher 4 opens the left and right movable wings 26a, 26b by pressing the sloped upper ends on the inner sides of the respective movable wings 26a, 26b. At the same time that the neck portion 4a of the pusher 4 is held by the portion 25, the outer periphery of the flange portion 5 of the pusher 4 is locked in a state of being gripped by the left and right movable blades 26a and 26b. The rotation of the guide shaft 29 is transmitted along with the operation of the movable blades 26a and 26b at this time, and the rotor 31 operates the micro switch SW2 in the pump body 3, whereby the flange portion 5 of the pusher 4 is fed. It can be detected that it is properly mounted in the groove 24 of the carriage 6.

  The syringe pump of the present invention enables the mounting of a plurality of types of syringes having different outer diameters, the mounting of the flange portion of the pusher by one-touch operation of one hand, and the switch when the flange portion of the presser is mounted Thus, the syringe can be used as a syringe pump that can detect that the flange portion of the pusher is properly mounted in the groove of the feed carriage.

1 is an overall top view of a syringe pump according to the present invention. 1 is an overall side view of a syringe pump according to the present invention. 1 is an overall bottom view of a syringe pump according to the present invention. It is an outer side view of the pump main body of the syringe pump by this invention. It is an inner side perspective view of the feed carriage of the syringe pump by this invention. It is a fragmentary perspective view which shows the state which has mounted | worn with the flange part of the pusher to the feed carriage of the syringe pump by this invention. It is a fragmentary perspective view which shows the state which mounted | wore the feed carriage of the syringe pump by this invention with the flange part of the pusher. It is an inner side view of the pump main body of the syringe pump by this invention. It is a partial side view of the inner side edge part of a pump main body which shows the state which mounted | wore the pump main body of the syringe pump by this invention with the outer cylinder of the syringe. It is a partial bottom view of the inner side edge part in the pump main body of the syringe pump by this invention. It is an end elevation of the inner end of the pump body showing a state in which the outer cylinder of the syringe is mounted on the pump body of the syringe pump according to the present invention. It is a fragmentary perspective view which shows the moving member of patent document 1. FIG. It is a fragmentary perspective view which shows the moving member of patent document 1. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Syringe pump 2 Outer cylinder 3 Pump main body 3a Depression part 4 Pusher 4a Neck part 5 Flange part 6 Feed carriage 7 Case 7a Engagement groove 8 Outer cylinder holding part 9 Top part 10 Clamp lever 11 Spring 12 Clamp shaft 13 Base 13a Screw 14 Motor 15 Rotating shaft 16 Pulley 17 Feed screw 18 Pulley 19 Belt 20 Feed nut 21 Feed shaft 22 Shaft member 23 Carriage body 23a Through hole 24 Groove 25 Receiving portion 25a, 25b U-shaped 26a, 26b Movable blade 27 Locking portion 28 Rack 29 Guide shaft (with surface)
29a Faceted 30 Stator 30a Hole 31 Rotor 31a Extension piece 31b Recessed portion 31c Right angle portion 32 Spring 33 Metal fitting 34 Screw 35 Mover 36 Sensor 37 Connecting member 38 Sensor shaft 39 Coil spring 40 Shaft terminal 41 Support plate 41a Hole 42 Screw MS Micro switch SW1 Micro switch SW2 Micro switch SF Flange S1 Small syringe S2 Large syringe

Claims (3)

In a syringe pump having a pump body to which an outer cylinder of a syringe containing a chemical solution is attached, and a feed carriage which is attached to a flange portion of a pusher inserted into the outer cylinder and moves the pusher. The feed carriage has a receiving portion formed inside the carriage body via a groove, and left and right movable wings pivotally supported at intervals inside the groove. The inside of the wing has a shape that locks the outer periphery of the flange portion of the pusher and extends upward, and each movable wing protrudes in a downwardly inclined manner toward the inside. The movable wings have a locking portion, and the movable wings on both sides are simultaneously opened and closed by meshing the racks formed on both sides, and an elastic member is provided to urge the movable wings in a direction to be always closed. Connected to the wing shaft State rotor fixed to the id shaft has a structure for operating the switch provided on the pump body side by the operation of the movable blade, closed flange portion of the pushing element Te in the groove of the feed carriage The left and right movable wings are opened by being dropped from above between the left and right movable wings, and the neck portion of the pusher is held by the receiving portion, and at the same time, the flange portion of the pusher is moved to the left and right movable wings. The flange portion of the pusher is locked by the rotation of the guide shaft in accordance with the movement of the movable blade at this time, and the rotor operates the switch in the pump body. Is a shilling pump characterized in that it is detected that it is properly mounted in the groove of the feed carriage. Wherein the pump body is a syringe pump of claim 1, wherein the clamp lever to hold according to different diameter outer cylinder of the syringe mounted on a predetermined position is provided. When the outer cylinder of the syringe is attached to a predetermined location of the pump main body, a flange portion provided in the outer cylinder of the syringe is inserted into an engagement groove provided in the pump main body. A sensor that operates in response to a downward movement of a mover provided in the engagement groove so as to be movable up and down, and when the flange portion of the outer cylinder of the syringe is inserted into the engagement groove 3. The detection according to claim 1, wherein the fact that the syringe is properly attached to a predetermined portion of the pump body is detected by detecting that the mover is lowered by a sensor. Syringe pump.