JP2018171299A - Syringe pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a syringe pump capable of suppressing misjudgement of a size of a syringe.SOLUTION: A syringe pump comprises: a syringe clamp 4 for holding a syringe body 110 at a clamp position; a clamp position detection part 81 for detecting an unclamp position and a clamp position of the syringe body 110 in the syringe clamp 4 as detection values; a syringe size determination part 912 for determining a syringe size; an unclamp position determination part 913; and an origin point reset part 914 for, when a syringe 100 is not mounted to the syringe pump 1 in power start-up time of the syringe pump 1, when it is determined that, the detection value of the unclamp position of the syringe clamp 4 is separated from a prescribed reference value by a distance less than a preset first set value, by the unclamp position determination part 913, resetting the detection value of the unclamp position and correcting the same, in the syringe clamp 4.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a syringe pump.

  Syringe pumps (syringe infusion pumps) are devices that accurately deliver liquid in syringes of various different sizes. The syringe pump is intended to perform injection of a chemical solution into a patient with high accuracy, and is excellent in injection accuracy as compared with a general-purpose infusion pump.

  The syringe pump is used by placing a syringe filled with a chemical solution on a syringe base and fixing it with a syringe clamp, and hooking the plunger of the syringe on the hook of the plunger holder to move the plunger holder parallel to the syringe. Thus, the plunger is pushed forward in the axial direction to inject the chemical solution.

  Since chemicals injected using a syringe pump include powerful drugs that require high-precision injection, it is necessary to educate the operator about how to use the syringe pump. There is a risk of serious harm to the patient if misused.

  Therefore, the syringe pump is equipped with various safety mechanisms for preventing misuse. For example, a syringe recognition mechanism that automatically recognizes the syringe size by holding the syringe on the syringe base with a syringe clamp, a plunger recognition mechanism that monitors the mounting state of the plunger with a plunger holder, and a flange recognition that monitors the flange mounting state of the syringe with a flange clamp A mechanism or the like is provided in the syringe pump (see, for example, Patent Document 1).

JP 2010-29593 A

  The conventional syringe pump detects the position of the syringe clamp in the vertical direction, and automatically recognizes the syringe size depending on which size of the syringe recognition range the detected position falls within.

  The automatic recognition of the syringe size is performed by detecting the height position of the syringe clamp that sandwiches the syringe. However, due to external factors such as changes in the shape of the syringe pump (e.g., deformation of the clamp shaft, deformation of the clamp operation pressing portion) over time, deformation of the casing, change in detection sensitivity (temperature characteristics) of the sensor described later, etc. The detection range of the syringe may be displaced. If the detection range of the syringe is displaced, the syringe size may be misidentified or the syringe size cannot be recognized. If the syringe size is misidentified, the plunger holder may move the plunger at an incorrect injection speed based on the incorrect syringe size, resulting in an abnormal flow rate (overdose or underdose) of drug solution injection, Risks arise.

  Therefore, an object of the present invention is to provide a syringe pump capable of suppressing erroneous discrimination of the syringe size.

  The present invention is a syringe pump to which a syringe including a syringe body having a flange and a plunger is mounted, the syringe clamp holding the syringe body at a clamp position, and the unclamping of the syringe body in the syringe clamp A clamp position detection unit that detects a position and a clamp position as detection values; and a syringe size of the syringe body based on detection values of the unclamp position and clamp position of the syringe clamp detected by the clamp position detection unit. Based on a detection value of the unclamping position of the syringe clamp detected by the syringe size determination unit and the clamp position detection unit to be determined, a detection value of the unclamping position of the syringe clamp is set in advance from a predetermined reference value. Less than the first set value When the syringe pump is not attached to the syringe pump when the syringe pump is powered on, the unclamp position determination unit detects the unclamp position of the syringe clamp when the syringe pump is not powered. An origin reset unit that resets and corrects the detection value of the unclamping position in the syringe clamp when it is determined that is less than a predetermined first set value from a predetermined reference value. Regarding pumps.

  The unclamping position determination unit may further include a notification unit that issues a warning, and the unclamping position determination unit may detect the unclamping position of the syringe clamp based on a detection value of the unclamping position of the syringe clamp detected by the clamping position detection unit. That the detected value of the syringe clamp is unclamped from the predetermined reference value by the unclamping position determination unit. When it is determined that the set second set value or more is determined, the notification unit preferably notifies an alarm.

  A flange clamp that holds the flange; a plunger holder that holds the plunger; a flange detection unit that detects that the flange is held by the flange clamp; and the plunger that is held by the plunger holder. A plunger detection unit that detects that the flange is held by the flange clamp, and the plunger detection unit detects that the plunger is held by the plunger holder without detecting the flange detection unit. A syringe non-installation determining unit that determines that the syringe is not mounted on the syringe pump when the syringe pump is not installed, and the origin reset unit is Determined that the syringe is not attached to the syringe pump If it, it is preferable to perform the operation of correcting resets the detection value of the unclamping position in the syringe clamp.

  Moreover, it is preferable that the reference value of the detection value of the unclamping position of the syringe clamp is an initial value at the time of manufacturing the syringe pump or a previous value of the detection value detected by the clamp position detection unit.

  ADVANTAGE OF THE INVENTION According to this invention, the syringe pump which can suppress the misidentification of the size of a syringe can be provided.

It is a perspective view showing a syringe pump concerning one embodiment of the present invention. It is a partial expansion perspective view of the plunger holder periphery of a syringe pump. It is a perspective view which shows the case where a syringe is mounted | worn with a syringe pump. It is a longitudinal cross-sectional view of the syringe clamp of a syringe pump, Comprising: It is a figure which shows the case where a syringe clamp is an unclamp state. It is a longitudinal cross-sectional view of the syringe clamp of a syringe pump, Comprising: It is a figure which shows the case where a syringe clamp is a clamped state. It is a functional block diagram of a syringe pump.

  Hereinafter, a preferred embodiment of the syringe pump 1 of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing a syringe pump 1 according to an embodiment of the present invention. FIG. 2 is a partially enlarged perspective view around the plunger holder 6 of the syringe pump 1. FIG. 3 is a perspective view showing a case where the syringe 100 is attached to the syringe pump 1.

  The syringe pump 1 according to the present embodiment is used for automatically injecting a medical solution into a patient in a medical facility or the like. As a chemical | medical solution inject | poured with the syringe pump 1, a chemotherapeutic agent, an anesthetic, a nutrient, etc. are mentioned, for example.

As shown in FIGS. 1 to 3, a syringe 100 is attached to the syringe pump 1.
First, the syringe 100 will be described. As shown in FIG. 3, the syringe 100 includes a syringe body 110 and a plunger 120. The syringe main body 110 includes an outer cylinder part 111, a cylinder tip part 112, and a main body side flange 113 as a flange. The plunger 120 is also called a pusher and has a plunger main body 121 and a plunger side flange 122.

  Next, the syringe pump 1 of the present invention will be described. As shown in FIG. 1, the syringe pump 1 includes a case body 2, a syringe base 3, a syringe clamp 4, a main body side flange clamp 5 (flange clamp), a plunger holder 6, a lever 7, and a control device 9. (See FIG. 6). As shown in FIG. 6, the syringe pump 1 includes a clamp position detection sensor 81 (clamp position detection unit), a flange detection sensor 82 (flange detection unit), a pusher detection sensor 83 (plunger detection unit), Is provided.

As shown in FIG. 1, the case body 2 is formed in a box shape extending in a predetermined direction. Various operation units 21, a display unit 22, and an operation indicator lamp 23 are arranged on the upper surface of the case body 2.
The operation unit 21 includes a power button, an injection start button, an injection stop button, an injection fast-forward button, and the like.
The display unit 22 is disposed on the front side of the case body 2. The display unit 22 displays the operation state of the syringe pump 1, the automatically recognized syringe size, the injection flow rate, and the like.
The operation indicator lamp 23 is disposed in the center of the front side of the syringe pump 1. The operation indicator lamp 23 is lit or blinked while the plunger 120 of the syringe 100 is pushed out to inform the patient that the drug solution is being injected.

  The syringe base 3 is disposed on the back side of the upper surface of the case body 2. As shown in FIG. 3, the syringe 100 is placed on the syringe table 3 along the longitudinal direction on the back side of the case body 2. The syringe table 3 extends in the longitudinal direction of the case body 2. The upper surface of the syringe base 3 is formed in a concave shape that is recessed downward on the semicircular arc shape so as to be along the peripheral surface of the syringe body 110 of the syringe 100. For example, a syringe 100 having a capacity of 5 mL, 10 mL, 20 mL, 30 mL, 50 mL, or the like can be placed on the syringe table 3.

  The main body side flange clamp 5 is disposed adjacent to one end side of the syringe table 3. The main body side flange clamp 5 is configured so that the main body side flange 113 of the syringe main body 110 is interposed between the main body side flange clamp 5 and a side portion on one end side of the syringe base 3 in a state where the syringe 100 is placed on the syringe base 3. Hold it in place. The main body side flange clamp 5 holds the syringe main body 110 in a predetermined position when the plunger 120 of the syringe 100 is pushed forward along the axial direction. Thereby, only the plunger 120 is pushed out to the syringe body 110 side.

  A flange detection sensor 82 (not shown in FIGS. 1 to 3, see FIG. 6) is provided in the case body 2. The flange detection sensor 82 is configured such that when the main body side flange 113 of the syringe main body 110 of the syringe 100 is disposed between the main body side flange clamp 5 and the side portion on one end side of the syringe base 3, the main body side flange clamp 5 is By being pushed away from the base 3, it is detected that the main body side flange 113 is held by the main body side flange clamp 5. Thereby, the flange detection sensor 82 detects whether or not the syringe body 110 of the syringe 100 is mounted on the syringe base 3 of the syringe pump 1.

  The syringe clamp 4 presses the syringe body 110 of the syringe 100 placed on the syringe table 3 from above, and holds the syringe body 110 of the syringe 100 with the syringe table 3 at the clamp position.

  The clamp position detection sensor 81 (not shown in FIGS. 1 to 3, see FIG. 6) detects the unclamp position and the clamp position of the syringe body 110 in the syringe clamp 4 as detection values. A mechanism for detecting the size of the syringe 100 in the syringe clamp 4 will be described later.

  The plunger holder 6 is disposed at a position separated from the syringe table 3 on one side. The plunger holder 6 holds the plunger-side flange 122 of the plunger 120 of the syringe 100 and pushes and moves the plunger 120 toward the syringe body 110. As shown in FIG. 2, the plunger holder 6 has a plunger hook 61 and a plunger pusher 62.

  The plunger hook 61 is composed of a pair of hook pieces facing each other arranged on the syringe base 3 side, and is normally closed and is opened by operating the lever 7. The plunger hook 61 sandwiches one end side of the plunger main body 121 of the plunger 120 of the syringe 100 placed on the syringe table 3 and holds the plunger side flange 122 between the plunger pusher 62.

  The plunger push-out unit 62 is configured to be linearly movable in parallel with the syringe 100 by a slider mechanism (not shown), and the plunger 120 (see FIG. 3) is moved at a predetermined speed toward the syringe main body 110 placed on the syringe table 3. Extrude with Thereby, the liquid in the syringe 100 is inject | poured into a patient.

  A pusher detection sensor 83 (not shown in FIGS. 1 to 3, see FIG. 6) is provided inside the plunger holder 6. When the plunger 120 of the syringe 100 is attached to the plunger holder 6, the pusher detection sensor 83 is configured so that the plunger 120 of the syringe 100 is moved to the plunger holder 6 by the plunger pusher 62 being pushed to the inside of the case body 2. Detect that it was held. Accordingly, the pusher detection sensor 83 detects whether or not the plunger 120 of the syringe 100 is attached to the plunger holder 6 of the syringe pump 1.

  The lever 7 is disposed on the plunger holder 6. The lever 7 is operated when the plunger hook 61 is opened and closed or when the plunger 120 is moved in the horizontal direction when the syringe 100 is mounted.

  Next, a mechanism for detecting the size of the syringe 100 in the syringe clamp 4 will be described. FIG. 4 is a longitudinal sectional view of the syringe clamp 4 of the syringe pump 1, and shows a case where the syringe clamp 4 is in an unclamped state. FIG. 5 is a longitudinal sectional view of the syringe clamp 4 of the syringe pump 1, and shows a case where the syringe clamp 4 is in a clamped state.

  4 and 5, the syringe clamp 4 includes a clamp operation pressing portion 41, a clamp shaft 42, a coil spring 43, a clamp base 44, and a clamp position detection sensor 81 (see FIGS. 4 and 5). (See FIG. 6). The clamp operation pressing portion 41 is urged downward by the tensile force of the coil spring 43.

  As shown in FIGS. 4 and 5, the clamp shaft 42 is provided on the upper surface of the syringe pump 1 in front of the syringe table 3 so as to be movable in the vertical direction with respect to the syringe table 3. The clamp shaft 42 extends in the vertical direction. A clamp operation pressing portion 41 is attached to the upper end of the clamp shaft 42. A clamp base 44 is attached to the lower end of the clamp shaft 42.

  The clamp operation pressing portion 41 is urged downward by a coil spring 43 with an appropriate tensile force. The clamp operation pressing portion 41 is configured to be able to be pulled upward against the urging force of the coil spring 43. Since the clamp base 44 is attached to the lower end of the clamp shaft 42 in conjunction with the vertical movement of the clamp operation pressing portion 41, the clamp base 44 also moves in the vertical direction.

  Further, the clamp operation pressing portion 41 is configured to be rotatable around the clamp shaft 42 by a gear mechanism (not shown). When holding the syringe 100 on the syringe base 3, the clamp operation pressing portion 41 is pulled up to the uppermost position and held in a state rotated by 90 degrees. Thereafter, after placing the syringe 100 on the syringe table 3, the clamp operation pressing portion 41 is returned to the original direction and pulled down onto the syringe 100.

  The clamp position detection sensor 81 (see FIG. 6) detects a detection value of the unclamping position (see FIG. 4) of the syringe body 110 and a detection value of the clamping position (see FIG. 5) of the syringe body 110 in the syringe clamp 4. To do. In the present embodiment, the clamp position detection sensor 81 detects the position of the lower end portion 441 of the clamp base 44 in the vertical direction, thereby detecting the detection value of the unclamping position of the syringe body 110 in the syringe clamp 4 and the syringe body 110. And the detected value of the clamp position of. As the clamp position detection sensor 81, for example, a linear displacement sensor that detects the vertical position of the clamp base 44 can be used.

  In the syringe clamp 4 configured as described above, the syringe 100 placed on the syringe table 3 is held on the syringe table 3 by being pressed by the clamp operation pressing unit 41 of the syringe clamp 4 from above. .

  In the state where the syringe 100 is held on the syringe table 3, the vertical position of the clamp operation pressing portion 41 is determined. Since the movement of the clamp operation pressing portion 41 in the vertical direction and the movement of the clamp base 44 in the vertical direction are linked, the position of the clamp base 44 in the vertical direction is also determined. In this state, the clamp position detection sensor 81 detects the vertical position (unclamp position (see FIG. 4) and clamp position (see FIG. 5)) of the syringe clamp 4.

  The position of the syringe clamp 4 in the vertical direction is determined according to the size of the syringe 100. Therefore, based on the position of the syringe clamp 4 in the vertical direction, the syringe placed on the syringe table 3 by determining the size of the diameter of the syringe 100 by the syringe size determination unit 912 in the control unit 91 described later. 100 sizes can be determined.

  Here, the automatic recognition of the syringe size is performed by detecting the position of the height of the syringe clamp 4 in the syringe pump 1 equipped with the syringe 100, and the height of the syringe clamp 4 stored in the storage unit 92 (described later) and the syringe. This can be done by recognizing the syringe size based on the correspondence with 100 syringe sizes (capacity). The syringe 100 is manufactured for each manufacturer. For example, the capacity is 5 mL, 10 mL, 20 mL, 30 mL, 50 mL, and the like. When there are a plurality of capacities of the syringes 100 and the diameters of the respective syringes 100 are different in capacity, it is necessary to recognize the syringe size with high accuracy because it differs in millimeters.

  In addition, when the manufacturer is different, the diameter of the syringe 100 may be different even if the capacity of the syringe 100 is the same. Therefore, in order to determine the syringe size, the syringe pump 1 also has a function of selecting a manufacturer. In addition, in recent years, syringe pumps selected to automatically recognize the syringe size of a syringe pump manufactured by one manufacturer are filled with, for example, certain pre-made anesthetics manufactured by other manufacturers. Some of such syringes have a function that can be automatically recognized. Specifically, for example, in the syringe pump, when the capacity manufactured for each manufacturer can recognize 5 mL, 10 mL, 20 mL, 30 mL, and 50 mL syringes, for example, the capacity of one manufacturer There are cases where the syringe size is different between a syringe with a volume of 50 mL and a syringe with a volume of 50 mL from another manufacturer. If the syringe size is different, if the syringe size (the size of the syringe diameter) between the syringe of one manufacturer and the syringe of another manufacturer can be measured with high accuracy, It becomes possible to automatically recognize the syringe by distinguishing the syringe size. In such a case, it is necessary to recognize the syringe size with higher accuracy.

  Thus, when recognizing the syringe size of a plurality of types of syringes, it is necessary to recognize the syringe size with high accuracy. Here, since the determination of the syringe size of the syringe 100 is performed by clamping the syringe pump 1 to which the syringe 100 is attached to the syringe clamp 4, when the syringe pump 1 is deformed (for example, deformation of the clamp shaft 42, dimensional change). , Deformation of the clamp operation pressing portion 41, etc.), the detection range of the syringe 100 may be displaced, and the syringe size of the syringe 100 may be erroneously recognized. If the syringe size is misidentified, the plunger holder may move the plunger at an incorrect injection speed based on the incorrect syringe size, resulting in an abnormal flow rate (overdose or underdose) of drug solution injection, Risks arise. Factors for erroneously recognizing the syringe size of the syringe 100 include, for example, a change in the shape of the syringe pump 1 due to a temperature change, a change in sensor detection sensitivity due to a temperature change, and a change in sensor detection sensitivity due to deterioration over time. The unclamping position of the syringe clamp 4 may change.

  Therefore, the syringe pump 1 of the present invention prevents erroneous determination of the syringe size due to a change in the shape of the syringe pump over time or deformation of the casing (for example, deformation of a convex portion on which the syringe clamp 4 of the case body 2 slides). Therefore, as a function that operates when the power is turned on, the control unit 91 of the control device 9 described later has a function of notifying an alarm by the unclamping position determination unit 913, the origin reset unit 914, and the notification unit 24.

Next, the content regarding control of the syringe pump 1 is demonstrated based on a functional block diagram. FIG. 6 is a control block diagram of the syringe pump 1.
As illustrated in FIG. 6, the control device 9 includes a control unit 91 and a storage unit 92.

  The storage unit 92 stores the syringe size (capacity) of the syringe 100 and the height of the syringe body 110 (the diameter of the syringe 100) when the syringe 100 is placed on the syringe table 3 in association with each other. Has been. Further, the storage unit 92 stores a recognition range (allowable margin) in the detection value of each syringe size. In addition, the storage unit 92 stores an initial value at the time of manufacture of the detected value of the unclamping position of the syringe pump 1, and stores the previous value of the detected value of the unclamped position detected last time of the syringe pump 1. In addition, the storage unit 92 stores a first setting value set in advance, a second setting value set in advance, and a third setting value set in advance.

  Detection signals from various sensors such as a clamp position detection sensor 81, a flange detection sensor 82, and a pusher detection sensor 83 are input to the control unit 91. Further, the controller 91 receives signals from various operation units 21 such as a power button, an injection start button, an injection stop button, and an injection fast-forward button. The control unit 91 receives signals from these sensors and the operation unit 21 and controls driving of a motor (not shown), displays various types on the display unit 22, and controls the operation display lamp 23 to turn on or blink.

  As illustrated in FIG. 6, the control unit 91 includes a syringe non-installation determination unit 911, a syringe size determination unit 912, an unclamp position determination unit 913, and an origin reset unit 914.

  The syringe non-installation determination unit 911 determines that the flange detection sensor 82 does not detect that the main body side flange 113 is held by the main body side flange clamp 5 and that the plunger 120 is held by the plunger holder 12. When the detection sensor 83 does not detect, it is determined that the syringe 100 is not attached to the syringe pump 1. The syringe non-mounting determination unit 911 indicates that the flange detection sensor 82 does not detect that the main body side flange 113 is held by the main body side flange clamp 5 and that the plunger 120 is held by the plunger holder 12. In addition to the condition that the pusher detection sensor 83 does not detect, a predetermined setting in which the difference between the detection value of the unclamping position and the detection value of the clamp position of the syringe clamp 4 detected by the clamp position detection sensor 81 is set in advance. It may be determined that the syringe 100 is not attached to the syringe pump 1 when the condition of being equal to or greater than the value is further satisfied.

  The syringe size determination unit 912 determines the syringe size of the syringe body 110 based on the detection values of the unclamp position and the clamp position of the syringe clamp 4 detected by the clamp position detection sensor 81. The syringe size determination unit 912 reads the correspondence relationship between the height of the syringe clamp 4 and the syringe size (capacity) of the syringe 100 and the recognition range in the detection value of each syringe size from the storage unit 92, and each syringe size. The numerical value range corresponding to is calculated, and the syringe size of the syringe 100 placed on the syringe table 3 is determined based on the detection signal of the clamp position detection sensor 81. The syringe size determination unit 912 automatically determines the syringe size of the syringe 100 when it is determined that the syringe 100 is placed on the syringe table 3. Thereby, the syringe size of the syringe 100 is automatically recognized. The automatically recognized syringe size of the syringe 100 is displayed on the display unit 22.

Based on the detection value of the unclamping position of the syringe clamp 4 detected by the clamp position detection sensor 81, the unclamping position determination unit 913 presets the detection value of the unclamping position of the syringe clamp 4 from a predetermined reference value. It is determined that the distance is less than the first set value.
Further, the unclamping position determination unit 913 determines that the detection value of the unclamping position of the syringe clamp 4 detected by the clamp position detection sensor 81 is more than a predetermined second set value from a predetermined reference value. To do.
Further, the unclamp position determination unit 913 determines that the detection value of the unclamp position of the syringe clamp detected by the clamp position detection sensor 81 is more than a predetermined third set value from a predetermined reference value. .
The predetermined reference value, the preset first set value, the preset second set value, and the preset third set value will be described later.

  When the syringe pump 1 is powered on, the origin reset unit 914 determines that the syringe 100 is not attached to the syringe pump 1 when the syringe non-installation determination unit 911 determines that the syringe clamp 4 When it is determined that the detected value of the unclamping position is less than the preset first set value from the predetermined reference value, the detected value of the unclamped position in the syringe clamp 4 is reset and corrected.

In the present embodiment, when the detection value of the unclamping position is reset and corrected, the predetermined reference value of the detection value of the unclamping position of the syringe clamp 4 is detected by the clamp position detection sensor 81, for example. This is the previous value of the detected value. As a result, if there has been a change in the shape of the syringe pump 1 due to a temperature change, a change in the sensor detection sensitivity due to a temperature change, or a change in the sensor detection sensitivity due to deterioration over time since the previous correction. The detection value of the clamp position can be reset and corrected.
The first set value set in advance is, for example, an upper limit value that can accurately determine the syringe size by resetting and correcting the detection value of the unclamping position in the syringe clamp 4 by the origin reset unit 914. Is set. For example, the first set value is obtained in advance through experiments or the like and stored in the storage unit 92 in advance.

  In addition, when the syringe pump 1 is powered on and the syringe 100 is not attached to the syringe pump 1, the origin reset unit 914 uses the unclamp position determination unit 913 to detect the detection value of the unclamp position of the syringe clamp 4 as a predetermined reference. When it is determined that the distance is not less than the second preset value set in advance from the value, an alarm is notified by the notification unit 24 described later without resetting the detection value of the unclamping position in the syringe clamp 4.

In the present embodiment, in the case where an alarm is notified by the notification unit 24 because the detected value of the unclamping position is not less than a predetermined second set value from a predetermined reference value, the unclamping of the syringe clamp 4 is performed. The reference value of the position detection value is, for example, an initial value when the syringe pump 1 is manufactured. If the shape change from the time of manufacture of the syringe pump 1 is too large, if the use is continued after correcting, for example, resetting the detection value of the unclamp position in the syringe clamp 4 by the origin reset unit 914, a cause different from the above There is a risk of missing a serious breakage of the syringe pump attracted from. Therefore, when the detection value of the unclamping position is away from the set second set value or more, it is possible to verify whether the syringe pump is seriously damaged by notifying the alarm by the notification unit 24.
Even if the second set value set in advance is corrected by resetting the detection value of the unclamping position in the syringe clamp 4 by the origin reset unit 914, the shape change from the time of manufacturing the syringe pump 1 is too large and accurate. A lower limit value that makes it difficult to make a correct determination is set. In the present embodiment, the second set value is set to the same value as the first set value, for example. The second setting value may be set to a value different from the first installation value. For example, the second set value is obtained in advance through experiments or the like and stored in the storage unit 92 in advance.

  When the unclamping position determination unit 913 determines that the detection value of the unclamping position of the syringe clamp 4 is more than a predetermined reference value, the notification unit 24 issues a warning. The notification unit 24 includes, for example, an indicator lamp and a speaker. Based on the signal from the control unit 91, the notification unit 24 turns on the indicator lamp, issues an alarm sound from the speaker, and the like. Note that the notification unit may be configured by the display unit 22, the operation indicator lamp 23, and the like, and the notification by the notification unit may be performed by displaying an error on the display unit 22, blinking of the operation indicator lamp 23, or the like.

  In addition, when the unclamp position determination unit 913 determines that the detection value of the unclamp position of the syringe clamp 4 is separated from a predetermined reference value by a preset third set value or more, the control unit 91 The resetting of the detection value of the unclamping position in the syringe clamp 4 by the origin reset unit 914 is not executed, and the operation of notifying the alarm by the notification unit 24 is not executed.

The significance of setting the third set value will be described. When the detected value of the unclamping position of the syringe clamp 4 is more than a predetermined third set value from the predetermined reference value, the syringe clamp 4 is in a state where the syringe 100 is sandwiched between the syringe clamp 4 and the syringe clamp 4. Since the displacement amount is large, it is far from the displacement amount caused by a change in the shape of the syringe pump 1 due to a temperature change, a change in sensor detection sensitivity due to a temperature change, or a change in sensor detection sensitivity due to deterioration over time. Displacement amount.
Therefore, when the detected value of the unclamping position of the syringe clamp 4 is more than a predetermined third set value from a predetermined reference value, it is assumed that the syringe 100 is sandwiched between the syringe clamp 4 and the syringe pump 1. The operation executed when the syringe 100 is not attached to the unclamp position (the unclamp position executed when the detection value of the unclamp position of the syringe clamp 4 is less than the preset first set value from the predetermined reference value) An alarm is issued by the notifying unit 24 that is executed when the detected value of the syringe is reset and corrected, or when the detected value of the unclamping position of the syringe clamp 4 is away from a predetermined reference value by a predetermined second set value or more. Is not performed.
For example, a value that can determine that the syringe 100 is clamped by the syringe clamp 4 is set as the third set value that is set in advance. The third set value can be set to a value larger than the first set value and the second set value. For example, the third set value is obtained in advance through experiments or the like and stored in the storage unit 92 in advance.
For example, even when the syringe 100 is mounted on the syringe pump 1, the main body side flange 113 may not be mounted on a predetermined site, or the plunger 120 may not be mounted properly on the plunger holder 6. Alternatively, it may be determined that the syringe 100 is not attached to the syringe pump 1 because the flange detection sensor 82 and the pusher detection sensor 83 are out of order. Further, there is a possibility that another thing is sandwiched in the syringe clamp 4 together with the syringe 100. Even in such a case, since the detected value of the unclamping position of the syringe clamp 4 is separated from the predetermined reference value by a preset third set value or more, the syringe pump 1 is not attached. It is possible to prevent an operation of resetting and correcting the detection value of the unclamping position.

Next, the operation of the syringe pump 1 will be described.
When the power of the syringe pump 1 to which the syringe 100 is not attached is turned on, the controller 91 performs calibration of various sensors when the power of the syringe pump 1 is activated. Various sensors have manufacturing variations, mounting variations, temperature variations, and the like, and there is an offset in the detection signal, but the offset is canceled by performing a calibration process.

  Here, in the present embodiment, when the syringe pump 1 is turned on, the syringe non-installation determination unit 911 determines whether or not the syringe 100 is not mounted on the syringe base 3. When the syringe non-installation determination unit 911 determines that the syringe 100 is not mounted on the syringe table 3, the unclamp position determination unit 913 detects the detection value of the unclamp position of the syringe clamp 4 from a predetermined reference value. Then, an operation of determining that the distance is less than the preset first set value or that the distance is greater than or equal to the preset second set value is executed.

  When the syringe pump 1 is powered on and the syringe 100 is not attached to the syringe pump 1, the unclamped position determination unit 913 sets the detection value of the unclamped position of the syringe clamp 4 from a predetermined reference value in advance. When it is determined that the distance is greater than or equal to the set value, the origin reset unit 914 does not reset the detection value of the unclamping position in the syringe clamp 4, and the control unit 91 notifies the alarm by the notification unit 24. The reference value of the detected value of the unclamping position of the syringe clamp 4 is, for example, an initial value when the syringe pump 1 is manufactured. Thereby, when the change of the shape from the time of manufacture of the syringe pump 1 is too large and it is difficult to perform accurate measurement, the alarm unit 24 can notify an alarm.

  When the syringe pump 1 is powered on and the syringe 100 is not attached to the syringe pump 1, the detection value of the unclamping position of the syringe clamp 4 is set in advance from a predetermined reference value by the unclamping position determination unit 913. When it is determined that the distance is less than the set value, the origin reset unit 914 resets and corrects the detection value of the unclamping position in the syringe clamp 4. The reference value of the detection value of the unclamping position of the syringe clamp 4 is the previous value of the detection value detected by the clamp position detection sensor 81, for example. Thereby, when there is a change in the detection value of the unclamping position of the syringe clamp 4 due to a change in the shape of the syringe pump 1 due to a temperature change, a change in the detection sensitivity of the sensor due to a temperature change, a deterioration of the sensor over time, etc. The detection value of the unclamping position can be reset and corrected.

  Subsequently, after performing an operation of resetting and correcting the detection value of the unclamping position in the syringe clamp 4, the syringe 100 is attached to the syringe pump 1. Specifically, the user pulls up the clamp operation pressing portion 41 of the syringe clamp 4 to place the syringe 100 filled with the chemical solution on the syringe table 3, and the clamp operation pressing portion 41 of the syringe clamp 4 is Lift up and then down. Thereby, the syringe 100 is held on the syringe table 3. In addition, the syringe 100 is mounted on the syringe pump 1 by operating the plunger holder 6 with the lever 7 and engaging the plunger 120 with the plunger hook 61.

  During this series of operations, the detection signal of the clamp position detection sensor 81 fluctuates, but when the syringe 100 is attached, the detection signal of the clamp position detection sensor 81 settles to a certain level. Therefore, when the control unit 91 detects that the detection signal of the clamp position detection sensor 81 does not change for a predetermined time, the syringe size determination unit 912 is based on the detection value detected by the clamp position detection sensor 81. The syringe size of the syringe 100 placed on the syringe table 3 is determined with reference to the information stored in the table, and the syringe size of the syringe 100 is recognized.

  When the syringe size of the syringe 100 is recognized, the recognition result is displayed on the display unit 22. The user confirms the syringe size and injection flow rate displayed on the display unit 22 and presses the start button (operation unit 21). Thereby, the movement of the plunger holder 6 (see FIG. 2) starts, the plunger 120 is pushed out, and the chemical solution in the syringe 100 is injected.

  According to the syringe pump 1 of this embodiment demonstrated above, there exist the following effects.

  (1) The syringe pump 1 that holds the syringe body 110 at the clamp position, the clamp position detection sensor 81 that detects the unclamp position and the clamp position of the syringe body 110 in the syringe clamp 4 as detection values, A syringe size determination unit 912 that determines the syringe size, and an unclamp position determination unit 913 that determines that the detected value of the unclamp position of the syringe clamp 4 is less than a predetermined first set value from a predetermined reference value. When the syringe pump 1 is powered on, when the syringe 100 is not attached to the syringe pump 1, the detection value of the unclamp position of the syringe clamp 4 is set in advance from a predetermined reference value by the unclamp position determination unit 913. When it is determined that the distance is less than the first set value To, and configured to include an origin reset unit 914 to correct and reset the detection value of the unclamping position in the syringe clamp 4. Thereby, for example, even when there is a change in the shape of the syringe pump 1 due to a temperature change, a change in the detection sensitivity of the sensor due to a temperature change, a change in the detection sensitivity of the sensor due to deterioration over time, etc. When the power source 1 is activated, the detection value of the unclamping position in the syringe clamp 4 can be reset and corrected. Therefore, the size of the syringe 100 can be determined with high accuracy, and erroneous determination of the size of the syringe 100 can be suppressed.

  (2) It is further provided with a notification unit 24 that notifies a warning, and the detection value of the unclamping position of the syringe clamp 4 by the unclamping position determination unit 913 is separated from a predetermined reference value by a predetermined second set value or more. Is determined, the origin reset unit 914 is configured not to execute the operation of resetting the origin at the unclamping position of the syringe clamp 4, and the notification unit 24 is configured to notify the alarm. Thereby, for example, when the displacement of the unclamping position of the syringe clamp 4 is too large due to, for example, a change in the shape of the syringe pump 1 or deformation of the housing, an alarm can be notified by the notification unit 24.

  (3) The flange detection sensor 82 does not detect that the main body side flange 113 is held by the main body side flange clamp 5, and the pusher detection sensor 83 detects that the plunger 120 is held by the plunger holder 6. If not, the syringe pump 1 is configured to include a syringe non-mounting determination unit 911 that determines that the syringe 100 is not mounted, and the origin reset unit 914 is configured to have a syringe non-mounting determination unit when the syringe pump 1 is powered on. When it is determined by 911 that the syringe 100 is not attached to the syringe pump 1, an operation of resetting and correcting the detection value of the unclamping position in the syringe clamp 4 is executed. Thereby, the syringe non-installation determination unit 911 can reliably determine that the syringe 100 is not installed in the syringe pump 1. Therefore, the origin reset unit 914 can perform correction by resetting the detection value of the unclamping position in the syringe clamp 4 when the syringe 100 is not attached to the syringe pump 1.

  (4) The reference value of the detection value of the unclamping position of the syringe clamp 4 is the initial value at the time of manufacturing the syringe pump 1 or the previous value of the detection value detected by the clamp position detection sensor 81. Thereby, the determination in the unclamping position determination unit 913 can be performed with high accuracy.

  In this embodiment, when the detection value of the unclamping position is reset and corrected, the reference value of the detection value of the unclamping position of the syringe clamp 4 is detected by the clamp position detection sensor 81, for example. This is the previous value of the detected value. Thereby, when determining the syringe size of the syringe 100, the temperature change in the syringe pump 1 is performed by resetting and correcting the detection value of the unclamping position based on the previous value every time the syringe pump 1 is powered on. Following the displacement of the detected value of the unclamping position caused by the change in shape due to the change in the sensitivity due to the temperature change in the sensor, etc., the reset of the detected value of the unclamped position can be corrected. Therefore, the size of the syringe 100 can be accurately determined when a minute displacement of the detected value of the unclamping position due to a temperature change or the like occurs.

  Further, in the present embodiment, when an alarm is notified by the notification unit 24 because the detection value of the unclamping position is more than a preset second setting value, the detection of the unclamping position of the syringe clamp 4 is performed. The reference value of the value is, for example, an initial value when the syringe pump 1 is manufactured. Thereby, the change in shape from the time of manufacture of the syringe pump 1 is too large, and thus, the change in shape from the time of manufacture of the syringe pump 1 is too large, and the unclamp position in the syringe clamp 4 by the origin reset unit 914 When it is difficult to make an accurate determination even if the detected value is reset and corrected, an alarm can be notified by the notification unit 24.

As mentioned above, although one preferable embodiment of the syringe pump 1 of this invention was described, this invention is not restrict | limited to the said embodiment, As long as it does not deviate from the meaning of this invention, it can change suitably.
For example, in the embodiment, when the predetermined reference value of the detection value of the unclamping position of the syringe clamp 4 is corrected by resetting the detection value of the unclamping position, the detection value detected by the clamp position detection sensor 81 In the case where an alarm is notified by the notification unit 24 because the detection value of the unclamping position is not less than the second set value set in advance, the initial value at the time of manufacturing the syringe pump 1 It is not limited to this. On the contrary, when a predetermined reference value of the detection value of the unclamping position of the syringe clamp 4 is corrected by resetting the detection value of the unclamping position, the initial value at the time of manufacturing the syringe pump 1 is When the alarm is notified by the notification unit 24 because the detection value of the clamp position is more than the preset second set value, the previous value of the detection value detected by the clamp position detection sensor 81 may be used.

1 Syringe pump 4 Syringe clamp 5 Body side flange clamp (flange clamp)
6 Plunger holder 24 Notification unit 81 Clamp position detection sensor (clamp position detection unit)
82 Flange detection sensor (flange detection part)
83 Pusher detection sensor (plunger detector)
100 Syringe 110 Syringe body 113 Body side flange (flange)
120 Plunger 911 Syringe non-installation determination unit 912 Syringe size determination unit 913 Unclamp position determination unit 914 Origin reset unit

Claims (4)

A syringe pump equipped with a syringe comprising a syringe body having a flange and a plunger,
A syringe clamp for holding the syringe body at a clamp position;
A clamp position detection unit that detects an unclamp position and a clamp position of the syringe body in the syringe clamp as detection values;
A syringe size determination unit that determines a syringe size of the syringe body based on detection values of the unclamp position and the clamp position of the syringe clamp detected by the clamp position detection unit;
Based on the detected value of the unclamping position of the syringe clamp detected by the clamp position detecting unit, the detected value of the unclamping position of the syringe clamp is separated from a predetermined reference value by less than a preset first set value. An unclamping position determination unit for determining whether or not
When the syringe pump is powered on, when the syringe is not attached to the syringe pump, a detection value of the unclamp position of the syringe clamp is preset from a predetermined reference value by the unclamp position determination unit. A syringe pump comprising: an origin reset unit that resets and corrects a detection value of an unclamping position in the syringe clamp when it is determined that the distance is less than a set value. It further includes a notification unit that notifies a warning,
The unclamping position determination unit is configured to preset a detection value of the unclamping position of the syringe clamp from a predetermined reference value based on a detection value of the unclamping position of the syringe clamp detected by the clamp position detection unit. It is determined that it is more than the second set value,
When it is determined by the unclamping position determination unit that the detected value of the unclamping position of the syringe clamp is more than a predetermined second set value from a predetermined reference value, the notification unit issues an alarm. The syringe pump according to claim 1 which reports. A flange clamp for holding the flange;
A plunger holder for holding the plunger;
A flange detector for detecting that the flange is held by the flange clamp;
A plunger detector for detecting that the plunger is held by the plunger holder;
When the flange detector does not detect that the flange is held by the flange clamp, and when the plunger detector does not detect that the plunger is held by the plunger holder, the syringe pump A syringe non-installation determination unit that determines that the syringe is not installed,
The origin reset unit, when the syringe pump power is turned on, when the syringe non-installation determination unit determines that the syringe pump is not installed in the syringe pump, The syringe pump according to claim 1 or 2, wherein an operation of resetting and correcting is executed.   The reference value of the detection value of the unclamping position of the syringe clamp is an initial value at the time of manufacturing the syringe pump or a previous value of the detection value detected by the clamp position detection unit. The syringe pump in any one.

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