JP4833731B2 - Syringe pump - Google Patents

Description

  The present invention relates to a syringe pump that holds various different syringes in an immobile state, sets a syringe pusher in an immobile state with respect to a slider means, and accurately feeds the contents of the syringe by driving the slider means. In particular, the present invention relates to a syringe pump with improved safety and a method of using the same.

  The main purpose of the syringe pump is to perform nutritional supplementation, blood transfusions, chemotherapeutic agents, anesthetics, and other chemicals for patients over a relatively long period of time in an intensive care unit (ICU). The chemical flow rate control and the like are often used because they are superior to other types of pumps. The usage method is that a syringe containing a chemical solution is set in an immobile state using a clamp of a syringe pump, a syringe pusher is set on the slider, and the slider is manually driven to an infusion start position as an initial position. Thus, the contents in the syringe are accurately sent out by the piston movement of the syringe pusher, and many of them are put into practical use because the infusion accuracy is relatively good for the simple structure.

Also, Japanese Patent Publication No. 9-506288 proposes a syringe pump configured to detect that the syringe pusher is set on the slider and to manually drive the slider to the infusion start position as the initial position. Has been. (Patent Document 1)
Furthermore, Japanese Patent Application Laid-Open No. 2004-73373 proposes a syringe pump configured to detect that the syringe cylinder portion is correctly set on the table. (Patent Document 2)
JP-T 9-506288 JP 2004-73373 A

  On the other hand, in a syringe pump, if there is a syringe mounting defect, the syringe size (outer diameter / inner diameter) is mistakenly recognized, and there is a risk of under- and over-injection of the chemical solution.

  According to the technique disclosed in the above Japanese Patent Application Laid-Open No. 2004-73373, it can be detected that the syringe barrel is correctly set on the pedestal of the syringe pump, but is set in a recess near the pedestal. It cannot be detected that the syringe flange portion to be correctly set is set.

  In this way, when the syringe flange portion to be set in the recess is removed from the recess, the syringe pusher is set on the slider, and the inside of the syringe is in a negative pressure state, the syringe barrel (outer barrel) moves to the slider side. This is a risk of over-injection of chemicals.

  On the other hand, if the syringe pump is placed at a position higher than the lying patient, the syringe flange part to be set in the recess is set in the recess, and the syringe pusher is left detached from the slider, the gap between the patient and the syringe pump There are reports of accidents in which a siphoning phenomenon occurs due to a drop in the head, and in this case, there is a risk of excessive injection of the chemical solution.

  Therefore, the present invention has been made in view of the above circumstances, and aims to provide a syringe pump with superior safety and a method of using the same by warning to prevent the occurrence of poor syringe mounting. It is said.

In order to solve the above problems and achieve the object, the syringe pump according to the present invention has the following configuration. That is,
A pedestal that has an inclined surface that is symmetric with respect to the major axis direction of the syringe, and that can support the cylindrical portion of the syringe so that the bottom surface of the cylindrical portion is positioned at the bottom of the valley formed by the two inclined surfaces regardless of the syringe size. When,
A clamp for sandwiching the cylindrical portion of the syringe supported by the table with the inclined surface;
By setting the flange portion of the syringe, a recess that defines the position of the syringe in the long axis direction; and
Slider means that operates so as to be opened and closed and has a hook member for holding the pusher portion of a syringe whose cylindrical portion is supported on the pedestal, and pushes the pusher portion in order to send out the contents of the syringe A syringe pump comprising:
A first detection unit that detects a position of the clamp in a radial direction of the cylindrical portion of the syringe when the cylindrical portion of the syringe is sandwiched between the inclined surface;
A second detection unit for detecting the bottom surface of the cylindrical portion of the syringe supported by the table;
When the cylindrical portion of the syringe is supported by the cradle and the flange portion of the syringe is set in the recess, the detection end is arranged at a position where the syringe comes into contact with the flange portion of the syringe regardless of the syringe size. A third detection unit for detecting that the flange portion of the syringe is set in the recess,
A fourth detection unit for detecting that the hook member has grasped the pusher part of the syringe whose cylindrical part is supported on the cradle by the opening degree of the hook member;
Warning means for outputting a warning based on the detection results in the first to fourth detection units,
The warning means performs a character display for prompting correct loading of the syringe together with display of a schematic diagram of the syringe.

The presence or absence of the syringe and the diameter of the cylindrical portion of the syringe are detected based on the position of the clamp detected by the first detection unit .

In addition, the second detection unit detects the bottom surface of the cylindrical portion of the syringe supported by the table by moving the actuator from the standby position to the detection position when the bottom surface of the cylindrical portion of the syringe contacts. It is characterized by doing .

Further, the third detection unit detects that the flange portion of the syringe is set in the concave portion by moving the actuator from the standby position to the detection position when the disk surface of the flange portion of the syringe comes into contact. It is characterized by doing .

Further, the warning means is characterized in that an alarm is sounded in synchronization with the three-dimensional display of the operation indicator to prompt correct loading of the syringe .

  According to the present invention, the syringe cylinder part (outer cylinder) is set in a correct posture along the three-dimensional direction (XYZ direction) on the table, and the syringe pusher is set correctly on the slider. Provided a safer syringe pump that can prevent accidents such as siphoning and excessive injection of chemicals, and a method of using the same by generating a warning to detect and set correctly if not set correctly It becomes possible.

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

  First, FIG. 1 is an external perspective view of the syringe pump 1, and shows a setting dial 6 that should be operated with the right hand with the operation panel portion 2 f forward and indicated by a broken line.

  In this figure, this syringe pump 1 is a device called a micro continuous infusion pump for the purpose of infusion of chemicals such as nutritional supplement, blood transfusion, chemotherapeutic agent, anesthetic agent, etc. in ICU, CCU, NICU, etc. The operability is improved by providing the operation panel 2f for performing the operation so as to be substantially concentrated on the upper surface as shown in the figure.

  The operation panel 2f is basically covered with an embossed sheet cover and has a drip-proof design that satisfies the eyelash test of JISC0920. For example, carelessly spilled chemicals can be easily wiped off. It has a high drip-proof property to prevent chemicals and the like from entering the inside.

  For this purpose, the upper cover 2 and the lower cover 3 which form the main body of the syringe pump 1 are integrally formed from a molded resin material having chemical resistance, and rubbers made of, for example, silicone elastomer are formed on the connection surfaces of the covers 2 and 3. By adopting a structure in which the seal 4 is screwed after the seal 4 is interposed, it is configured to prevent a foreign substance such as a liquid from entering the inside.

  In addition, in order to emphasize high accuracy of injection and operability, precise injection operation control by microcomputer control can be realized, and an operation indicator 7 provided to protrude upward from a position that is easily visible from the outside is illustrated. The light-emitting diode inside the operation indicator 7 is lit, blinks in multiple colors in red or green, or rotates and lit so that the infusion operation status and warning status can be monitored even from a distance. Therefore, the safety is ensured. Furthermore, a buzzer is also built in, and various alarm functions are provided for safety.

  In addition, it is compact and lightweight, and the handle 4 is integrally molded from the left side of the lower cover 3, so it is easy to carry and designed to be convenient for use when multiple units are used simultaneously. Yes. Further, by turning the setting dial 6 on the right side, the numerical value can be set in a short time according to the rotation speed and the rotation direction, while the set value can be displayed on the display unit 11 of the display panel, and the flow rate and the like. When the numerical value setting is changed, the setting dial 6 can be easily operated by one action.

  Furthermore, it has a shape that can be used multiple times (a combination of many) and a design that is easy to use and can be built up. The shape and dimensions are small, for example, height H: 70 mm x width W: 300 mm x depth D: 110 mm The weight is about 1.2 kg, and the power source is an AC commercial power source, a built-in battery, and DC12VA.

  The built-in battery has a charging time of about 16H (hours). The battery is covered with a lid at the bottom of the lower cover 3 so as to be easily replaceable from the outside, and is detachably provided by being connected to a connector. In addition, while the replacement life is 2 years or more, overcharging is prevented by constant current and constant voltage charging control. Furthermore, overdischarge and prevention of charging are realized by monitoring and controlling the capacity of the built-in battery, the voltage / current during charging, the voltage / current during discharging, and the like. A heat-resistant lithium-ion battery is used, and a new battery can be operated for 12H (hours) or more until an alarm is generated and at least about 12.5H (hours) or more until shutdown.

  A display unit 10 for integrating and gamma injection, a flow rate display unit 11 and others are provided on the operation panel 2f, while the setting dial 6 is formed so that it can be easily removed for cleaning. It is configured to be able to move to the outside and remove it while turning the toe.

  Next, referring further to FIG. 2 which is an external perspective view of the syringe pump illustrated in FIG. 1 together with the syringe, in order to set the syringe, the upper cover 2 is provided with a table 2a and a syringe cylinder S. The concave portions 8 and 9 where the integrally formed syringe flange portion SF is to be set are integrally injection-molded. A clamp column 2b (shown by a broken line in FIG. 1) for rotatably supporting the clamp 5 is also integrally formed.

  A slider assembly 50 driven in the direction of arrow D between the positions indicated by broken lines in FIG. 1 reciprocates on the step 2d of the lower case, while a pipe shaft described later with respect to the slider feed mechanism, The end of the inner clutch shaft is connected and fixed, and the syringe pusher SP can be easily mounted and removed by manually operating the clutch lever 52 of the slider assembly 50.

  Further, a power switch, an AC / DC lamp, and a battery lamp are concentrated on the left end portion of the operation panel 2f. A display unit 10 is arranged next to these lamps. Further, when the syringe is set using the clamp 5, the volume of the syringe set to 5cc (ml), 10cc is set by automatically measuring the syringe diameter after converting the vertical movement amount of the clamp 5 into an electric signal. A syringe display lamp is provided to display (ml), 20 cc (ml), 30 cc (ml), 50 cc (ml), and 100 cc (ml).

  In addition, a display lamp, a remaining amount alarm lamp, a battery alarm lamp, and the like are arranged in a concentrated manner so that the set detection pressure by the blockage detection mechanism provided in the syringe pump is displayed in three stages.

  The display unit 11 has a built-in 7-segment LED for displaying a flow rate, a scheduled amount, an integrated amount, and the like, and further includes a function switch, an integrated clear switch, a fast-forward switch, a start switch, a stop / mute switch, and the like.

  In addition, in order to detect that the syringe barrel S is set in the immobile state in the front-rear direction (X direction) with respect to the cradle 2a near the recess 8, the front / rear inclined surface is tilted at an angle α of the cradle 2a. A sensor serving as a second detection unit covered with a rubber cover 13 provided on the bottom surface 2h of the valleys 2a-1 and 2a-2 is provided.

  Next, referring to FIG. 2, when the syringe pusher SP is placed on the shape portion 55 a with the syringe pusher SP in contact with the slider assembly 50, when the clutch lever 52 is released, the left and right hooks 53, 54 are moved. The pusher SP of the syringe S is automatically held. That is, when the clutch lever 52 is released, the hook of the slider sandwiches the pusher of the syringe. The above is the basic set operation. The slider assembly 50 is fixed at the end portions of the inner clutch shaft 43 and the pipe shaft 40 of the slider feed mechanism, and detachably holds various different syringes in an immovable state, and drives the syringe contents by driving them. It has important functions for accurate delivery. Further, a boot 51 for waterproofing is put on the pipe shaft 40.

  When the clutch lever 52 is pressed in the direction of the arrow K1 to hold the syringe pusher SP, the left and right hook members 53 and 54 are opened in the direction of the arrow K2, respectively, and when the clutch lever 52 is released, the left and right hook members are moved to the holding position. Thus, by detecting this in conjunction with the slider mechanism, one end is always protruded by the action of the torsion spring so as to detect that the syringe pusher SP is correctly set on the slider assembly 50. A biased stopper part 57 is provided, and the clutch mechanism described in Japanese Patent No. 3581695 is provided so that the stopper part 57 is retracted when the syringe pusher SP is gripped (details are omitted). Yes.

  FIG. 3 is an external perspective view of the slider feed mechanism built in the upper cover 2. In this figure, a base 34 that is excellent in rigidity and vibration isolation, such as an aluminum die cast, is integrally formed with left and right wall surfaces 34a (one is not shown), and the gear of the gear train 36 is fixed to one end. Each of the lead screw 37, the inner clutch shaft 43, and the guide shaft 38 is supported in a space between the left and right wall surfaces 34a, and the lead screw 37 is rotatably supported by a bearing (not shown). In addition, a pressure sensor 72 is provided on one of the bearings so that the blockage can be detected.

  A pipe shaft 40 that is movable in the direction of arrow A4 by a guide bush 48 is slidably guided on the inner clutch shaft 43 in a coaxial manner. The guide shaft 38 is fixed to the base 34 in a stationary state. A block 41 to which a bush 42 made of polyacetal resin for preventing rotation by being inserted through the guide shaft 38 is fixed to an end portion of the pipe shaft 40. A nut holder 44 is fixed to the inner clutch shaft 43. The nut holder 44 is fixed to a half nut block 45 that is always urged in the direction of the broken arrow A1 shown in the drawing and the tooth portion 45a is always meshed with the tooth portion of the lead screw 37. The inner clutch shaft 43 is configured to be free to move in the direction of the double arrow A5 so as to be in a free state in which the meshing state is released only when the inner clutch shaft 43 is rotated in the direction of the solid arrow A3. Yes. A clutch sensor plate 39 is pivotally supported on the guide shaft 38.

  The slider feed mechanism 33 is further provided with a blockage detection mechanism using the pressure sensor 72 described above. The structure of the slider feed mechanism 33 is such that the rotation of the motor 35 having the encoder fixed to its output shaft is transmitted through the gear train 36 to the final gear fixed to the lead screw 37 which is a feed screw, whereby the nut holder 44 is moved. By moving and pressing the syringe pusher SP, the liquid medicine in the syringe can be infused. At this time, the nut holder 44 tries to advance in the feeding direction, but a force acting in the opposite direction is generated by the action of the resistance in the syringe S and other infusion channels.

  Thus, the generated force is subjected to a reaction force in the direction opposite to the feed direction by the meshing state of the half nut 45 fixed to the nut holder 44 and the seed screw 37. As a result, the entire feed screw moves in the reverse direction, and the tip portion of the feed screw is transmitted to the pressure sensor 72 via a lever (not shown).

  In this way, the transmitted force becomes a deflection of the pressure sensor 72, and this mechanical deflection is converted into an electrical output, and when it reaches the setting table, it is displayed on the operation indicator 7 as an alarm notifying the abnormal state. At the same time, an alarm sound (buzzer) is generated.

  In addition, the load setting resulting from the resistance in the syringe and other infusion channels is displayed in three steps by three display lamps provided on the display panel on the upper cover 2, and the load setting value is displayed. H (high); (800 ± 200 mmHg), M (medium); (500 ± 100 mmHg), L (small); (300 ± 100 mmHg).

  In addition, the occlusion detection mechanism also takes into account the sliding resistance of the syringe, and automatically detects each manufacturer and volume of the syringe (100 cc, 50 cc, 30 cc, 20 cc, 10 cc, 5 cc) based on the sliding resistance of the syringe. It is configured to correct. Further, the sliding resistance data of 40 companies of syringes is stored in advance in the replaceable memory inside the CPU, and any manufacturer can be set.

  On the other hand, the remaining amount detection mechanism is an important function when the remaining amount becomes low during the operation, and the pump continues to operate, the block 41 and the nut holder 44 are moved, and the pusher SP of the syringe is moved. When a certain position is reached, the metal fitting (not shown) fixed to the block 41 fixed to the pipe shaft 40 comes into contact with the lever of the potentiometer fixed inside the upper cover 2 of the main body. When the movement is further continued from the contact state, the value of the potentiometer reaches a predetermined value stored in advance. At this time, it is displayed on the operation indicator 7 as an alarm notifying the abnormal state, and an alarm sound is generated to display a remaining amount alarm.

  As described above, when the operation of injecting the chemical solution of the pump is completed, it moves in the direction opposite to the feeding direction, the slider is returned to the initial position, and the lever of the potentiometer is the tension spring connected to the lever. It is configured to return to the initial position by force. In addition, the clutch disengagement detection mechanism detects that the clutch lever 52 is accidentally gripped during the pump feed operation and the engagement between the half nut 45 and the lead screw 37 constituting the clutch assembly is cut off, or some load is applied. When the same thing occurs due to the above action, an alarm sound is generated, and the operation indicator 7 notifies the abnormality.

  For this purpose, when the clutch lever 52 of the slider assembly 50 is gripped, the half nut 45 is rotated in the opposite direction to the broken line arrow A1 via the pipe shaft 40. As a result, the thread 37a of the lead screw 37 and It is comprised so that the meshing state between the thread part 45a of the half nut 45 may remove | deviate. In addition, when the half nut 45 is rotated in this way, a clutch sensor is receiving a biasing force by a biasing means (not shown) so that the sliding surface 39c is always in contact with the sliding surface 45c of the half nut 45. The plate 39 is rotated at the same time, and a lever portion 39b at one end of the clutch sensor plate 39 is detected by a photosensor (transmission type) 46 as a fourth detection portion fixed inside the upper cover. The sensor 46 is normally shielded from light, and the clutch sensor plate 39 is rotated so that light is transmitted. Therefore, by detecting this, the syringe pusher SP is not held by the hook member. Is detected and an alarm is displayed.

  FIG. 4 is an external perspective view showing how the syringe is correctly set in the above configuration. In this figure, components and components that have already been described are denoted by the same reference numerals and description thereof is omitted, and the clamp 5 held in a spline-fitted state with respect to the vertical projection portion of the clamp column 2b is an upward arrow. When pulled up to J1, the upper end portion of the clamp post can stay against the unillustrated pulling force.

  Subsequently, the syringe flange SF is set in the recesses 8 and 9 and the syringe cylinder S is set on the table 2a. Then, the syringe cylinder S is correctly set on the table 2a and about 90 in the direction of the arrow J2. Rotate degrees. Then, the locked state is released and the syringe is clamped by being pulled in the direction opposite to the arrow J1 in the drawing.

  Thus, the syringe flange portion SF to be set in the recesses 8 and 9 in the vicinity of the pedestal is correctly set in the left-right direction (Y direction) with respect to the pedestal, and the syringe barrel S is moved in the front-rear direction (X direction). ) Is set correctly. Here, a small-diameter arc groove is further integrally formed in the recesses 8 and 9 and the table 2a so that the small-capacity small-diameter syringe can be held in an immobile state. Subsequently, the clutch lever 52 is released, the slider is moved, and the syringe pusher SP is properly held by the slider assembly 50.

  Thereafter, in FIG. 3 again, when the motor 35 is driven, the lead screw 37 is rotationally driven, and the nut holder 44 fixing the half nut 45 meshing with the lead screw 37 is moved, so that the pipe shaft 40 is also moved. Thereby, the slider assembly 50 is moved. At this time, the lever portion 39b at one end of the clutch sensor plate 39 shields the photosensor (transmission type) 46 from light.

  With the above configuration, it can be detected that the syringe barrel S is set in the correct orientation along the XZ direction on the cradle 2a and the syringe pusher SP is correctly set on the slider assembly 50. It cannot be detected that the syringe flange portion SF is correctly set in the Y direction in the recesses 8 and 9.

  Explaining in the figure, a defective set state as illustrated in the schematic diagrams of FIGS. 5A and 5B or a defective set state in which the syringe flange portion SF is detected by the clamp 5 as illustrated in FIG. 5C. Cannot be detected.

  That is, in FIG. 5 (a), when the syringe mounting position is not correct and placed on the table 2a, the syringe flange portion SF to be set in the recesses 8 and 9 is detached from the recess, and from this state. When the syringe pusher is set on the slider and infusion is started and the inside of the syringe is in a negative pressure state, the syringe cylinder (outer cylinder) S moves to the position shown by the broken line on the slider side, so that the drug solution in the syringe is discharged. Resulting in. 5B, when the syringe flange portion SF is positioned on the sensor serving as the second detection portion provided with the rubber cover and is held by the clamp 5, correct diameter measurement cannot be performed.

  Further, in FIG. 5C, a large outer diameter portion of the syringe flange portion SF is positioned on the sensor serving as the second detection portion provided with the rubber cover, and if it is held by the clamp 5, correct diameter measurement cannot be performed.

  Further, in the defective set state as shown in the schematic diagram of FIG. 6A, the syringe pusher SP is left in a state where it is detached from the slider assembly 50 shown by the broken line, and the syringe flange portion SF is set to the concave portion 8. , 9 and leaving the syringe pump at a position higher than the patient, a siphoning phenomenon occurs due to a drop between the patient and the syringe pump, and a risk of over-injection of the drug solution occurs.

  In order to prevent the above set defects, in addition to the sensor 46 serving as the fourth detection unit and the first sensor 21 serving as the first detection unit, the clamp 5 is interlocked as illustrated in FIG. If the second sensor 22 that is the second detection unit and the third sensor 23 that is the third detection unit that detects the presence or absence of the syringe flange SF by being provided in the recesses 8 and 9 are further provided, all sets It will be possible to deal with defects.

  Specifically, in FIG. 7, which is a cross-sectional view taken along the line AA in FIG. 6A, components and components that have already been described are denoted by the same reference numerals and description thereof is omitted. Is set with a syringe barrel S having different diameters d1 and d3. At this time, since it is placed along the inclined surface, positioning in the front-rear direction (X direction) is automatically performed.

  Further, the clamp 5 is provided with a shaft portion 5c to which the actuator 15 is fixed. After inserting the coil spring 68 into the shaft portion 5c as shown in the figure, the lid 5b is fixed and the clamp 5 can be clamped as described above. It is configured as follows. The actuator 15 is moved downward when the diameter of the syringe barrel S is reduced, and performs height detection by the first sensor 21 and presence / absence detection of the syringe barrel S by blocking the optical axis.

  Next, in FIG. 6B, which is a cross-sectional view taken along the line AA in FIG. 6A, components and parts that have already been described are denoted by the same reference numerals and description thereof is omitted. When the syringe cylinder S having a diameter different from that of the diameter is set as described above, the rubber cover 13 is pushed downward.

  Below the rubber cover 13 is pivotally supported around the shaft body 16 so as to be moved from the standby position shown by the solid line to the detection position shown by the broken line by contact with the syringe cylinder S, and is urged by the tension spring 17. The actuated actuator 15 is provided, and the actuator 15 is configured to detect that the syringe cylinder S is correctly set by blocking the optical axis of the second sensor 22.

  In FIG. 6C, a rubber cover (not shown) is provided in the space between the recesses 8 and 9, and a broken line is shown below the standby position shown by the solid line by contact with the syringe flange portion SF. The actuator 15 is pivotally supported around the shaft body 16 so as to be moved to the detection position and urged by the tension spring 17. The actuator 15 blocks the optical axis of the third sensor 23. Is configured to detect that the syringe flange portion SF is correctly set in the recesses 8 and 9.

  FIG. 8 is a block diagram of the syringe pump. In the figure, the same reference numerals are given to the components or parts already described, and the description thereof is omitted. The CPU 100 includes the first sensor 21, the second sensor 22, the third sensor 23, and the fourth sensor 46 described above. Is connected to the syringe mounting detection means 120, and is configured to permit infusion after confirming that detection has been performed by all these sensors.

  Further, the CPU 100 includes a syringe diameter detecting means 101 for determining the syringe diameter detected by the clamp 5, a manufacturer input means 102 for inputting a syringe manufacturer, a setting input means 103 for performing the above settings relating to infusion, and a syringe. Connected to the pusher position detection means 104 for detecting the drive position of the pusher SP, the closing pressure level changing means 105 connected to the pressure sensor 72, the comparison means 106, the storage means 107, and the drive motor 35. Driving means 108, operation indicator 7, buzzer 307, warning means 109 connected to the display section 11, display means 110 for controlling display of a predetermined message by being connected to the display section 10, and notice position calculation means 111 is connected.

  FIG. 9 is an operation explanatory flowchart for syringe set defect warning based on the block diagram of FIG.

  FIG. 10 is a diagram showing an example of character display on the display unit 11. 9, 10, and 6 (a), when this process is started, in step S <b> 1, it is determined whether or not the syringe pump 1 is in an operation state in the middle of the infusion. The process proceeds to S2 and the process is stopped. If it is determined in step S1 that the operation is not in progress, the process proceeds to step S3 in order to determine whether or not the syringe is set by the clamp 5, and detection by the first sensor 21 is performed. In the next step S4, the syringe is detected. It is determined whether or not the cylindrical portion S is correctly attached. After it is determined in step S4 that the infusion is not set correctly, if the infusion start switch is pressed in step S5, the process proceeds to step S6, and a warning character display (see FIG. 10) for prompting correct loading of the syringe is displayed on the display unit 11. Do this by blinking. Further, the operation indicator 7 and the buzzer 107 may be further energized. The process in step S6 is continued until it is correctly set in step S4.

  On the other hand, if it is determined in step S4 that the syringe is correctly set in the Z direction, the syringe diameter is measured and displayed in step S7. If not, display as described above, proceed to processing not shown, and end. If it is confirmed in step S7 that the syringe cylinder of the correct diameter is set, the process proceeds to step S8, and the second sensor 22 and the third sensor 23 detect that the syringe is correctly set in the X and Y directions. Then, the process proceeds to step S9. If it is not detected in step S9 that the syringe is correctly set in the X and Y directions, the process returns to step S6, and a warning character display that prompts correct loading of the syringe is displayed on the display unit 11 in a blinking manner. Alternatively, the correct setting may be promoted by further energizing the operation indicator 7 and the buzzer 107.

  If it is detected in step S9 that the syringe is correctly set in the X and Y directions, the process proceeds to step S10, and the set state of the syringe pusher SP by the fourth sensor 46 interlocked with the slider moving mechanism is detected, and step S11. Proceed to If the fourth sensor 46 detects that the pusher has been correctly attached in step S11, the process proceeds to step S12, the above-mentioned warning display and energization to the buzzer are stopped, the process is terminated, and the start of infusion is awaited. When the fourth sensor 46 detects that the pusher is not correctly attached in step S11, the process returns to step S6, and a warning character display for prompting correct loading of the syringe is displayed on the display unit 11 in a blinking manner or the operation indicator 7. The buzzer 107 is energized.

  It should be noted that the above operation explanation flowchart is merely an example, and it goes without saying that the detection order of the syringe barrel and the syringe pusher is not limited to the above order.

  In addition, reliability is improved by using an optical sensor that operates by blocking the optical axis as the first to fourth sensors. However, the present invention is not limited to this, and various sensors such as a mechanical contact type and a magnetic type are available. Can be used.

  As explained above, it is possible to relentlessly encourage the correct set of syringes, so that siphoning is possible even if the nurse is inadvertently or careless, in some cases maliciously exploited by a malicious third party. And accidents such as excessive injection of chemicals can be prevented.

It is the external appearance perspective view of the syringe pump 1, Comprising: It is the figure which made the operation panel part 2f ahead, and showed the setting dial 6 which should be normally operated with a right hand with the broken line. It is an external appearance perspective view of the syringe pump illustrated with the syringe. 3 is an external perspective view of a slider feed mechanism built in an upper cover 2. FIG. It is an external appearance perspective view of the syringe pump which illustrated a mode that the syringe was set correctly. (A), (b) is the schematic diagram which set the syringe to the defect set state, (c) is the schematic diagram of the defect set state which detects the syringe flange part SF with the clamp 5. FIG. (A) is the schematic diagram which set the syringe to the defective set state, (b) is the AA arrow directional cross-sectional view of (a), (c) is a schematic diagram of a 3rd detection part. It is AA arrow sectional drawing of Fig.6 (a). It is a block diagram of a syringe pump. FIG. 9 is an operation explanatory flowchart for a syringe set failure warning based on the block diagram of FIG. 8. It is the figure which showed the example of a character display of the display part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Syringe pump 2 Upper cover 2a Stand 3 Lower cover 4 Handle 5 Clamp 7 Operation | movement indicator 8, 9 Recess 10 Display part 11 Display part 13 Rubber cover (waterproof cover)
14 Actuator 21 1st sensor (1st detection part)
22 2nd sensor (2nd detection part)
23 3rd sensor (3rd detection part)
46 4th sensor (4th detection part)
50 Slide assembly 52 Clutch lever 53, 54 Hook member S Syringe cylinder part SF Syringe flange part SP Syringe pusher

Claims (5)

A pedestal that has an inclined surface that is symmetric with respect to the major axis direction of the syringe, and that can support the cylindrical portion of the syringe so that the bottom surface of the cylindrical portion is positioned at the bottom of the valley formed by the two inclined surfaces regardless of the syringe size When,
A clamp for sandwiching the cylindrical portion of the syringe supported by the table with the inclined surface;
By setting the flange portion of the syringe, a recess that defines the position of the syringe in the long axis direction; and
Slider means that operates so as to be opened and closed and has a hook member for holding the pusher portion of a syringe whose cylindrical portion is supported on the pedestal, and pushes the pusher portion in order to send out the contents of the syringe A syringe pump comprising:
A first detection unit that detects a position of the clamp in a radial direction of the cylindrical portion of the syringe when the cylindrical portion of the syringe is sandwiched between the inclined surface;
A second detection unit for detecting the bottom surface of the cylindrical portion of the syringe supported by the table;
When the cylindrical portion of the syringe is supported by the cradle and the flange portion of the syringe is set in the recess, the detection end is arranged at a position where the syringe comes into contact with the flange portion of the syringe regardless of the syringe size. A third detection unit for detecting that the flange portion of the syringe is set in the recess,
A fourth detection unit for detecting that the hook member has grasped the pusher part of the syringe whose cylindrical part is supported on the cradle by the opening degree of the hook member;
Warning means for outputting a warning based on the detection results of the first to fourth detection units,
The warning means performs a character display for prompting correct loading of the syringe together with a display of a schematic diagram of the syringe.   2. The syringe pump according to claim 1, wherein the presence or absence of the syringe and the diameter of the cylindrical portion of the syringe are detected based on the position of the clamp detected by the first detection unit.   The second detection unit detects the bottom surface of the syringe barrel supported by the cradle by moving the actuator from the standby position to the detection position by contacting the bottom surface of the syringe cylinder portion. The syringe pump according to claim 1.   The third detection unit detects that the flange portion of the syringe is set in the concave portion by moving the actuator from the standby position to the detection position by contact of the disk surface of the flange portion of the syringe. The syringe pump according to claim 1.   The syringe pump according to any one of claims 1 to 4, wherein the warning unit sounds an alarm in synchronization with a three-dimensional display of an operation indicator to prompt correct loading of the syringe.

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