JPWO2015046397A1 - Syringe pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively prevent a siphoning phenomenon. SOLUTION: A piston 1a of a syringe injector 1 attached to a syringe attachment part 11 is pushed by a pushing part 13, and the liquid in the syringe 1b of the syringe injector 1 is connected to the tip of the syringe 1b. In the syringe pump that is fed into the flexible infusion tube 2, the abnormality sensing units a1 to a3 that sense the abnormality and output the detection signal, and the valve device a4 that closes the infusion tube 2 by being deformed by pressing from the outside. And the valve device a4 is closed on condition that there is a detection signal from the abnormality detection units a1 to a3. [Selection] Figure 1

Description

  The present invention relates to a syringe pump that operates a syringe injector to be mounted and discharges various liquids such as a chemical solution and blood.

  Conventionally, this kind of invention includes, for example, a mounting portion (5) on which a syringe injector (syringe 3) is placed and a piston of the syringe injector (syringe 3) as described in Patent Document 1. The syringe injector includes a pusher (slider 24) for pushing the sucker 23, a tube is connected to the tip of the syringe injector, and the piston is pushed by the pusher. There is a syringe pump so as to send out the chemical solution or blood filled in the tube to the tube.

  According to the syringe pump of the conventional structure, the position of the tube on the downstream side of the tube is raised while the patient raises his arm or gets up while injecting a liquid such as a drug solution or blood into the patient lying on the bed. However, even when the position is higher than the syringe injector or when the installation position of the syringe pump is too low, the rear end portion of the piston is normally pressed by the pushing portion. It is possible to prevent the liquid from flowing backward (referred to as a siphoning phenomenon) due to the pressure in the reverse direction acting on the liquid inside, and the piston moving in the reverse direction.

  However, if the syringe injector is not normally set with respect to the syringe pump and the piston is retractable, the siphoning phenomenon may occur. .

Japanese Patent Laid-Open No. 5-42209

  This invention is made | formed in view of the said conventional situation, The process made into the subject is providing the syringe pump which can prevent a siphoning phenomenon effectively.

  One means for solving the above problem is to connect the liquid in the syringe of the syringe injector to the tip of the syringe by pushing the piston of the syringe injector attached to the syringe attachment portion by the pushing portion. In a syringe pump that is fed into a flexible infusion tube, an abnormality detection unit that detects an abnormality and outputs a detection signal thereof, and a valve device that closes the infusion tube by being deformed by pressing from the outside. The valve device is closed on condition that a detection signal is received from the abnormality detection unit.

  Since the present invention is configured as described above, the siphoning phenomenon can be effectively prevented.

It is a whole perspective view which shows the state which the cover member closed about an example of the syringe pump which concerns on this invention. It is a whole perspective view which shows the state which the cover member opened about the syringe pump. FIG. 3 is a cross-sectional view taken along line (III)-(III) in FIG. 1 and shows an example of the structure of the abnormality sensing unit. It is a longitudinal cross-sectional view which shows an example of the clamping mechanism and abnormality detection part which are comprised in the back | inner side of a flange part. It is a longitudinal cross-sectional view which shows an example of the to-be-pressed part comprised in a pushing part, and an abnormality detection part. FIG. 3 is a transverse cross-sectional view taken along line (VI)-(VI) in FIG. 2, (a) shows a state in which the valve device opens the infusion tube when the lid member is closed, and (b) shows an open state of the lid member. In this state, the valve device closes the infusion tube. The control system structure at the time of using a flow sensor about the abnormality detection part which concerns on this invention is shown. About the abnormality detection part which concerns on this invention, the control system structure at the time of using a syringe mounting | wearing detection sensor is shown.

The first feature of the present embodiment is that the piston of the syringe injector attached to the syringe attachment portion is pushed by the pushing portion, and the liquid in the syringe of the syringe injector is connected to the tip of the syringe In a syringe pump that is fed into a flexible infusion tube, an abnormality detection unit that detects an abnormality and outputs a detection signal thereof, and a valve device that closes the infusion tube by being deformed by pressing from the outside. Then, the valve device is closed on condition that there is a detection signal from the abnormality detection unit.
According to this configuration, when an abnormality is detected by the abnormality detection unit and the detection signal is output, the infusion tube is pressed and deformed from the outside by the valve device and is closed. Therefore, for example, if the patient raises his arm or gets up and the tip side of the infusion tube becomes higher than the syringe pump, the siphoning phenomenon in which the liquid in the tube flows backward can be prevented.

As a second feature, the abnormality sensing unit is configured to sense an abnormality in the mounting state of the syringe injector.
According to this configuration, when an abnormality in the mounting state of the syringe injector is detected by the abnormality detection unit, the infusion tube is pressed and deformed from the outside by the valve device and is closed.

As a third feature, the apparatus includes a syringe clamp that holds the syringe between the syringe mounting unit by moving in the syringe radial direction, and the abnormality detection unit has a position in the syringe radial direction of the syringe clamp in advance. It is configured to sense that it is outside the set range.
According to this configuration, when the syringe clamp position is out of the preset range due to a case where the syringe is not normally attached or a syringe of an unexpected size is attached, the infusion tube is a valve. It is pressed and deformed by the device to close.

As a fourth feature, the flange portion on the rear end side of the syringe includes a sandwiching mechanism that sandwiches the flange portion from both sides by a sandwiching base portion and a flange presser that approaches and separates from the sandwiching base portion. It is configured to sense that the position of the presser in the syringe axial direction is outside a preset range.
According to this configuration, the position of the flange pressing member in the syringe axial direction is out of the preset range when the flange portion is removed from the clamping mechanism or when the thickness of the flange is out of specification. In response to this determination, the infusion tube is pressed and deformed from the outside by the valve device and is closed.

As a fifth feature, a pressed portion is provided on the front end side of the pushing portion so as to be pressed backward by the rear end portion of the piston of the syringe injector when the syringe injector is mounted. The abnormality detection unit is configured to detect that the pressed portion is not pressed.
According to this structure, when the said to-be-pressed part is not pressed by the mounting | wearing defect etc. of a syringe injector, an infusion tube is press-deformed by the valve apparatus from the outside, and closes.

As a sixth feature, a tube insertion part is provided on the front side of the syringe mounting part to guide an infusion tube connected to the discharge part at the front end of the syringe and lead forward, and the valve device includes the tube insertion part. The infusion tube inserted through the portion is configured to be pressed and deformed from the radially outer side and closed.
According to this configuration, when the valve device is operated, the infusion tube can be closed at a position close to the discharge portion of the syringe injector.

The seventh feature is a syringe pump comprising a main body part to which a syringe injector and an infusion tube can be attached, and a lid member for closing the front side of the main body part so as to be openable and closable. , Disposed on the front surface side of the main body portion, and formed into a concave shape capable of fitting a sideways syringe injector from the front side, and the tube insertion portion of the syringe mounting portion on the front surface side of the main body portion. The infusion tube that is arranged so as to continue to the discharge side and extends in the lateral direction is formed in a concave shape that can be fitted from the front side.
According to this configuration, the syringe injector and the infusion tube can be easily and reliably attached from the front side of the main body. For this reason, it is possible to effectively prevent the liquid in the infusion tube from flowing due to poor mounting of the syringe injector or the infusion tube and causing a siphoning phenomenon.

It should be noted that the embodiments described later also disclose an invention that does not include a part of the above-described features and has the following constituent elements as essential.
That is, the present invention is a syringe pump comprising a main body part to which a syringe injector and an infusion tube can be attached, and a lid member for closing the front side of the main body part so as to be openable and closable. Includes a concave syringe mounting portion that can be fitted with a side-by-side syringe injector from the front side, and a concave shape that can be fitted from the front side with an infusion tube that extends to the discharge side of the syringe mounting portion and extends laterally. A tube insertion portion is provided.
According to the present invention, the syringe injector and the infusion tube can be easily and reliably attached from the front side of the main body. For this reason, the malfunction etc. resulting from the mounting | wearing defect of a syringe injector and an infusion tube can be prevented.

  Next, a preferred embodiment having the above features will be described in detail with reference to the drawings.

As shown in FIGS. 1 and 2, the syringe pump A includes a main body portion 10 to which the syringe injector 1 and the infusion tube 2 can be attached, and a lid member 20 that closes the front side of the main body portion 10 so as to be openable and closable. The piston 1a of the syringe injector 1 mounted on the syringe mounting portion 11 of the main body portion 10 is pushed by the pushing portion 13, and the liquid in the syringe 1b of the syringe injector 1 is moved to the tip of the syringe 1b. It is comprised so that it may send into the flexible infusion tube 2 connected.
And this syringe pump A press-deforms the 1st-3rd abnormality detection part a1, a2, a3 (refer FIGS. 3-5) and the infusion tube 2 from the outside which detects abnormality and outputs the detection signal. The valve device a4 (see FIG. 6) is closed, and the valve device a4 is provided on condition that any one of the first to third abnormality detection units a1, a2, and a3 is detected. Actuate to close the infusion tube 2.

  The syringe injector 1 attached to the syringe pump A includes a cylindrical syringe 1b and a piston 1a inserted from the rear side with respect to the syringe 1b.

  The syringe 1b is composed of a substantially bottomed cylindrical tube portion 1b1 having a discharge portion on the bottom wall on the front end side, and a flange portion 1b2 that is annularly expanded on the rear end side of the tube portion 1b1. The infusion tube 2 is connected to the discharge portion at the front end of 1b1 so as to communicate with the inside of the syringe 1b (see FIG. 2).

  The piston 1a is a shaft-like member that is inserted into the syringe 1b and slid back and forth, and its rear end is pushed by the pushing portion 13 of the syringe pump A to advance, thereby discharging the liquid in the syringe 1b. Push forward from the section. In addition, this piston 1a may be called a pusher by those skilled in the art.

  The infusion tube 2 is a flexible tube made of a synthetic resin material. When the infusion tube 2 is pressed from the outside in the radial direction, it is elastically deformed inward and closes the internal passage.

Further, the main body 10 of the syringe pump A has an open front side (left side according to FIG. 3) with a substantially concave cross section, and the concave portion has a syringe 1b as shown in FIG. It has the syringe attachment part 11 made to contact over a longitudinal direction, and the tube insertion part 12 which penetrates the infusion tube 2 in the front side rather than this syringe attachment part 11.
Moreover, the pushing part 13 is provided so that it may protrude from this main-body part 10 back (right according to FIG. 2).

A syringe clamp 31 is provided on the rear end side (right end side according to FIG. 2) of the syringe mounting portion 11 so as to sandwich the syringe 1b with the syringe mounting portion 11 (see FIG. 3).
The syringe clamp 31 is a member having a concave curved surface facing the syringe mounting portion 11, and approaches or separates from the syringe mounting portion 11.
As shown in FIG. 3, the lower end side of the syringe clamp 31 is connected to a slide shaft 32 orthogonal to the syringe 1b.

The slide shaft 32 is supported in the main body 10 so as to advance and retreat in the axial direction in the main body 10 and is urged rearward (rightward in FIG. 3) by the urging member 33.
According to the illustrated example, the urging member 33 is a compression coil spring. One end side is hooked in the main body 10, and the other end side is hooked on the slide shaft 32, and the slide shaft 32 is moved backward. Bounce. In addition, as another example of the urging member 33, it is also possible to adopt a mode using a tension spring or other elastic body.

The rear end portion of the slide shaft 32 is connected to the first abnormality sensing unit a1.
The first abnormality sensing unit a1 is configured to sense that the position of the syringe clamp 31 in the approaching / separating direction with respect to the syringe 1b is out of a preset range, and to output the sensing signal.
More specifically, the first abnormality detection unit a1 in the illustrated example includes a variable resistance unit 34 (for example, a linear potentiometer) provided in parallel with the slide direction of the slide shaft 32, and a rear of the slide shaft 32. A lever portion 35 connected to the end side is provided, and the resistance value of the variable resistor portion 34 is changed according to the position of the lever portion 35 in the linear direction, and the output voltage is changed by changing the resistance value.

The output voltage from the first abnormality sensing unit a1 is input to the control unit a5 (see FIG. 7), and the control unit a5 determines whether or not the voltage is within a predetermined range.
Here, the predetermined range is a value set in advance corresponding to the syringe outer diameter range of the syringe injector 1 that can be installed in the syringe pump A. That is, when the syringe outer diameter of the syringe injector 1 that can be used by the syringe pump A is, for example, φ5 mm to φ50 mm, the first abnormality detection when the syringe 1b in this outer diameter range is sandwiched by the syringe clamp 31 The output range of the part a1 is the predetermined range.
Therefore, when a syringe injector outside the outer diameter range is installed for the syringe pump A, or when the syringe injector 1 is not normally sandwiched by the syringe clamp 31, the first abnormality detection unit The output voltage of a1 falls outside the predetermined range, and the control unit a5 (see FIG. 7) recognizes that it is abnormal.

A clamping mechanism 40 that clamps and releases the flange 1b2 of the syringe 1b from both sides in the syringe axial direction is provided on the syringe rear end side of the main body 10 (see FIGS. 2 and 4).
As shown in FIG. 4, the clamping mechanism 40 includes a clamping base 41 that receives a part of the flange portion 1 b 2 from the front side, a flange pressing 42 that approaches and separates from the rear with respect to the clamping base 41, and the flange pressing 42. Of the slide body 43 supported so as to advance and retreat, the urging member 44 for urging the flange presser 42 and the slide body 43 forward (to the left in FIG. 4), the flange presser 42 and the slide body 43. And a second abnormality sensing unit a2 that senses the position in the advancing / retreating direction.

As shown in FIG. 4, the sandwiching base portion 41 is a long portion that is substantially orthogonal to the syringe axial direction, and is fixed in the main body portion 10 so as not to advance or retreat.
When the syringe injector 1 is attached to the main body portion 10, the sandwiching base portion 41 receives a part of the flange portion 1b2 at the rear end of the syringe 1b in the syringe injector 1 from the front side.

  The flange presser 42 is a plate-like member that is substantially parallel to the sandwiching base 41. The flange retainer 42 is integrally connected to the slide body 43 so as to slide back and forth together with the slide body 43.

The slide body 43 includes a slide main body portion 43a that advances and retreats within the main body portion 10, a plurality of slide shafts 43b extending rearward from the slide main body portion 43a, and a latch provided on the front end side of the slide main body portion 43a. Part 43c.
According to the example shown in FIG. 4, the slide shaft 43 b is two shaft-like members arranged at intervals in the vertical direction, each inserted through the clamping base portion 41, and connected to the flange end 42 at the rear end portion. doing.
According to the illustrated example, the hooking portion 43c is formed in a hook shape, and is hooked on the lever portion 46 so as to pull the lever portion 46 of the second abnormality sensing portion a2 rearward.

  Further, the urging member 44 is a compression coil spring, and is attached to each slide shaft 43b in an annular shape, with its rear end abutting against the clamping base 41 and with its front end abutting against the slide body 43a, 42 and the slide body 43 are urged forward (to the left according to FIG. 4). The biasing member 44 can be replaced with a configuration using an elastic body such as a tension spring, a leaf spring, or rubber.

And the 2nd abnormality detection part a2 is comprised so that it may detect that the position of the syringe axial direction of the flange presser 42 remove | deviated from the preset range (refer FIG. 4).
More specifically, the second abnormality sensing unit a2 includes a variable resistance unit 45 (for example, a linear potentiometer) provided in parallel to the syringe axial direction (left and right direction according to FIG. 4), and a latching unit. 43c, and the resistance value of the variable resistance part 45 is changed according to the position of the lever part 46 in the linear direction, and the output voltage is changed by changing the resistance value.
In FIG. 4, reference numeral 47 denotes a spring that pulls the lever portion 46 in the forward direction and makes contact with the hook-shaped portion of the latching portion 43 c.

The output voltage from the second abnormality sensing unit a2 is input to the control unit a5. The control unit a5 determines whether or not the voltage is within a predetermined range. , Recognized as abnormal.
Here, the predetermined range is a value set in advance corresponding to the thickness range of the flange portion 1b2 of the syringe injector 1 that can be installed in the syringe pump A. That is, several types of thicknesses of the flange portion 1b2 of the syringe injector 1 that can be used by the syringe pump A are assumed. The output range of the second abnormality detection unit a2 when the flange portion 1b2 having several thicknesses is sandwiched by the clamping mechanism 40 is set as the predetermined range.
Therefore, for a syringe pump A, when a syringe injector having a flange portion with an unexpected thickness is installed, or when the flange portion is not clamped by the clamping mechanism 40 due to poor installation of the syringe injector, etc. Based on the fact that the output voltage of the second abnormality sensing unit a2 is outside the predetermined range, the control unit a5 recognizes that there is an abnormality.

  The pushing portion 13 is moved forward and backward with respect to the main body portion 10 of the syringe pump A by an electric motor (not shown) or a mechanism (for example, a pinion rack mechanism) that converts the rotational motion of the electric motor into a linear motion. In the forward movement, the piston 1a of the syringe injector 1 is pushed and moved. And in this pushing part 13, the 3rd abnormality detection part a3 is comprised.

  As shown in FIG. 5, the third abnormality sensing unit a <b> 3 is provided on the front end side of the pushing unit 13 so as to be pushed backward by the rear end portion of the piston 1 a when the syringe injector 1 is mounted. A pressed body 51, a slide body 52 provided so as to advance and retreat in the push section 13 in conjunction with the pressed section 51, a swing body 53 that engages and swings with the slide body 52, And a sensor unit 54 that detects the swing of the swinging body 53, and detects whether or not the pressed portion 51 is pressed against the piston 1a by a signal from the sensor unit 54 and outputs the detection signal. To do.

The pressed portion 51 is provided so as to protrude forward from the casing 13a of the pressing portion 13 and to slide backward relative to the casing 13a.
As illustrated in FIG. 5, the pressed portion 51 has an elastically deformable portion 51 a (for example, rubber) protruding forward from the casing 13 a and a transverse T-shaped cross section that receives the elastically deformable portion 51 a from the inner side. A pressed base 51b and a shaft 51c on the center side of the pressed base 51b are provided, and are configured to advance and retreat integrally.

  The slide body 52 is provided in the pushing portion 13 so as to slide rearward while coming into contact with the pressed portion 51 and to move forward by a biasing force of a biasing member 55 described later.

  The oscillating body 53 is supported so as to be able to oscillate with respect to the casing 13a of the pushing portion 13, and one end side (the lower end side according to FIG. In addition, the other end side (the upper end side according to FIG. 5) is fitted to the sensor unit 54 so as to be separable. The swinging fulcrum part p1 of the swinging body 53 is provided with a biasing member 55 (for example, a torsion coil spring). The swinging support part p1 causes the swinging body 53 to separate the other end side from the swinging body 53. It is energized in the direction to do.

  Further, the sensor unit 54 is a substantially concave photoelectric sensor. According to the illustration of FIG. 5, the sensor unit 54 has a light projecting unit on one of the front side and the back side across the recess, and on the other side. A light receiving unit is provided, and a signal is output when light emitted from the light projecting unit is blocked by the oscillator 53 and does not reach the light receiving unit.

  According to the third abnormality sensing unit a3 having the above configuration, for example, when the syringe injector 1 is not attached, or when the piston 1a portion of the syringe injector 1 is detached, the attached state of the syringe injector 1 When the pressed part 51 is not pressed due to the above problem, the pressed part 51 is held in a protruding state by the urging force of the urging member 55 as shown in FIG. It is maintained in the inserted state. In this state, the optical path between the light projecting unit and the light receiving unit of the sensor unit 54 is blocked by the oscillator 53, and a signal is output from the sensor unit 54 to the control unit a5 (see FIG. 7). a5 is recognized as abnormal.

Moreover, the valve apparatus a4 which opens and closes the infusion tube 2 inserted by the tube insertion part 12 is comprised in the position corresponding to the tube insertion part 12 of the main body part 10 front side (refer FIG.2 and FIG.6).
The tube insertion portion 12 is formed in a transverse U-shaped cross section having a vertical dimension slightly larger than the outer diameter of the infusion tube 2 so that the infusion tube 2 is inserted from the front side and held without backlash (FIG. 6 ( a)). A slit hole 12a for inserting a pressing piece 61 of a valve device a4 to be described later is provided on the upper wall of the tube insertion portion 12.

The valve device a4 is configured to press and deform the infusion tube 2 inserted through the tube insertion portion 12 from the radially outer side (upper side according to FIG. 6).
More specifically, the valve device a4 includes a pressing piece 61 that presses the outer peripheral surface of the infusion tube 2 through the slit hole 12a, and a biasing member 62 that biases the pressing piece 61 in the opening direction. And a solenoid 63 that operates the pressing piece 61 in the closing direction against the urging member 62.

The pressing piece 61 is supported so as to rotate by a predetermined amount with respect to the main body portion 10 of the syringe pump A via the swing shaft portion 61a. That is, the pressing piece 61 is positioned away from the infusion tube 2 in the radially outward direction (see FIG. 6A) and fully closed so as to crush the infusion tube 2 (see FIG. 6B). Rotate between.
Then, one end side (the left end side according to FIG. 6) of the pressing piece 61 is pulled in a direction away from the infusion tube 2 by a biasing member 62 (a tension coil spring according to the illustrated example).
Further, the other end side (the right end side according to FIG. 6) of the pressing piece 61 is engaged with the distal end side of the plunger 63a so as to be rotated by the rectilinear movement of the plunger 63a of the solenoid 63. According to the illustrated example, this engagement structure is based on the fitting between the long hole and the shaft.

  The solenoid 63 is a mechanism for retracting the plunger 63a, which is a magnetic body, by the magnetic force of the coil portion 63b that is energized. The forward movement of the plunger 63 a may be performed by the tensile force of the urging member 62 transmitted through the pressing piece 61. As another example, the plunger 63a may be advanced by a biasing member (not shown) other than the biasing member 62.

Therefore, according to the valve device a4 having the above structure, when the solenoid 63 is excited by the power supply from the control unit a5 and the plunger 63a of the solenoid 63 moves backward, the pressing piece 61 engaged with the plunger 63a is closed. And the infusion tube 2 is pressed and deformed. Therefore, the inside of the infusion tube 2 is closed so that it cannot flow.
On the contrary, when the power supply from the control unit a5 is interrupted, the pressing piece 61 rotates in the direction away from the infusion tube 2 by the urging force of the urging member 62, and the infusion tube 2 is elastically restored. It returns to the original cylindrical shape by the force, and the inside of the infusion tube 2 is opened so as to be able to flow.

The lid member 20 is rotatably supported on the lower end side on the front surface side of the main body portion 10 via a hinge or a shaft member so as to open and close the front surface side of the main body portion 10. The lid member 20 is provided with a display device 21 (for example, a liquid crystal panel or the like) for displaying a flow rate or displaying an abnormality, a power switch 22, a numeric key switch 23 for adjusting a flow rate, operating, or the like.
When the lid member 20 is turned upward, the lid member 20 is hooked on the front surface of the main body 10 and closes the front surface. In this closed state, as shown in FIG. 1, the display device 21, the power switch 22, the numeric key switch 23, and the like are exposed on the front side of the lid member 20.

Moreover, the control part a5 (refer FIG. 7) which controls the said syringe pump A is comprised in the main-body part 10 or the cover member 20. FIG. The control unit a5 is an electronic circuit (a so-called microcomputer circuit or the like) that causes the central processing unit (CPU) to function based on a control program stored in a storage device (not shown).
The control unit a5 is provided on the condition that one of the first abnormality detection unit a1, the second abnormality detection unit a2, and the third abnormality detection unit a3 has a detection signal from the abnormality detection unit. Then, power is supplied to the valve device a4 to close the valve device a4. Further, the control unit a5 notifies the occurrence of an abnormality substantially simultaneously with the closing operation by displaying on the display device 21 or outputting sound from a speaker (not shown).
Further, the control unit a5 shuts off the power supply to the valve device a4 and opens the valve device a4 when all of the plurality of abnormality detection signals are not present.
As another example of the valve device a4, it is possible to have a structure that opens when power is supplied and closes when the power is shut off.

  Therefore, according to the syringe pump A having the above-described configuration, when a mounting abnormality or detachment of the syringe 1b, the flange portion 1b2 or the piston 1a occurs in the syringe injector 1, or the syringe injector 1 having an unexpected size is mounted. In such a case, the infusion tube 2 can be closed by the valve device a4. For this reason, for example, the syringe pump A is used without noticing the mounting abnormality, etc., and the patient raises his arm or gets up in this state, and the distal end side of the infusion tube 2 becomes higher than the syringe pump A, It is possible to prevent the siphoning phenomenon in which the liquid in the infusion tube 2 flows backward.

According to the syringe pump A, the infusion tube 2 is closed when an abnormality in the mounting state of the syringe injector 1 is sensed. As another example, the infusion tube is sensed by detecting another abnormality. It is also possible to have a configuration in which 2 is closed.
For example, the syringe pump B shown in FIG. 2 replaces the first to third abnormality sensing units a1, a2, a3, etc. in the syringe pump A, and provides a flow rate sensor a6. The flow rate sensor a6 detects the flow rate detected by the flow rate sensor a6. Is configured to close the infusion tube 2 when it is outside the predetermined flow rate range.
The flow sensor a6 may be, for example, a flow meter (for example, a thermal flow meter) that can measure a relatively small flow rate, and is provided in the path of the infusion tube 2.
Control part a5 has memorized beforehand the predetermined flow range used as a threshold. The predetermined flow rate range is a standard flow rate range when liquid is discharged by the syringe pump B, and is determined in advance by experiment or calculation.
And the control part a5 judges that the installation position of the syringe pump B is too high when the measured flow volume measured by the flow sensor a6 is larger than the said flow rate range, and closes the infusion tube 2 and displays The occurrence of abnormality is notified by the display of the device 21 and the sound output from a speaker (not shown).
In addition, when the actual flow rate measured by the flow rate sensor a6 is smaller than the flow rate range, the control unit a5 determines that the installation position of the syringe pump B is too low, closes the infusion tube 2, The occurrence of an abnormality is notified by display on the display device 21 and sound output from a speaker (not shown).
Therefore, the syringe pump B can effectively prevent the siphoning phenomenon and the like.

  As still another example, the first to third abnormality sensing units a1, a2, a3 and the flow rate sensor a6 are all provided, and when an abnormality is sensed by all or any of them, the infusion tube 2 is provided. A configuration in which the valve device a4 is closed is also possible.

  In the above embodiment, the syringe injector 1 is used as the first and second abnormality sensing units a1 and a2 so that it can be determined that the attachment is abnormal even when the syringe injector 1 having an unexpected size is attached. The output value is changed continuously according to the position (specifically, a potentiometer or the like). However, as another example, if the mounting state of the syringe injector 1 of the same size is detected, A limit switch, a photoelectric sensor, or the like can also be used as the one or two abnormality detection units a1 and a2.

  Moreover, according to the said Example, although the photoelectric sensor was used for the sensor part 54 as a preferable aspect with especially little operation resistance about the 3rd abnormality detection part a3, as another example, a limit switch is used for the sensor part 54. It is also possible to use other sensors.

  According to the above embodiment, as a particularly preferable aspect, the control unit a5 is any one of the first abnormality sensing unit a1, the second abnormality sensing unit a2, and the third abnormality sensing unit a3. The power supply is supplied to the valve device a4 and the valve device a4 is closed on condition that a detection signal from the abnormality detection unit is received. However, as another example, the condition for the closing may be two or more. It is also possible to use a detection signal by any abnormality detection unit or a detection signal by all abnormality detection units.

Moreover, in the said Example, although opening / closing of the cover member 20 and operation | movement of the valve apparatus a4 are not interlock | cooperated, it is also possible to make these two operation | movement interlock | cooperate as another example.
In this other example, a fully-closed sensor for detecting that the lid member 20 is fully closed is provided, and when the fully-closed sensor does not detect the fully-closed state of the lid member 20, the valve device a4 is closed, When the fully-closed sensor senses the fully-closed state of the lid member 20 and no abnormality is detected in any of the first to third abnormality sensing units a1, a2, a3 (and / or the flow sensor a6). The valve device a4 is opened.

DESCRIPTION OF SYMBOLS 1: Syringe injector 1a: Piston 1b: Syringe 1b2: Flange part 2: Infusion tube 10: Main body part 11: Syringe mounting part 12: Tube insertion part 13: Pushing part 20: Lid member 31: Syringe clamp 40: Holding mechanism 41: clamping base part 42: flange presser 51: pressed part a1 to a3: abnormality detection part a4: valve device a5: control part A, B: syringe pump

Claims (7)

The piston of the syringe injector attached to the syringe attachment portion is pushed by the pushing portion so that the liquid in the syringe of the syringe injector is fed into a flexible infusion tube connected to the tip of the syringe. In the syringe pump
An abnormality detection unit that detects an abnormality and outputs a detection signal thereof, and a valve device that closes the infusion tube by pressing and deforming from the outside, provided that there is a detection signal from the abnormality detection unit, A syringe pump characterized in that the valve device is closed.   The syringe pump according to claim 1, wherein the abnormality detection unit is configured to detect an abnormality in a mounting state of the syringe injector. Provided with a syringe clamp for sandwiching the syringe between the syringe mounting part by movement in the syringe radial direction,
The syringe pump according to claim 2, wherein the abnormality sensing unit is configured to sense that the position of the syringe clamp in the syringe radial direction is outside a preset range. A sandwiching mechanism that sandwiches the flange portion on the rear end side of the syringe from both sides by a sandwiching base portion and a flange presser that approaches and separates from the sandwiching base portion;
The syringe pump according to claim 2 or 3, wherein the abnormality sensing unit is configured to sense that the position of the flange pressing member in the syringe axial direction is outside a preset range. On the front end side of the pushing portion, a pressed portion is provided so as to be pushed backward by the rear end portion of the piston of the syringe injector when the syringe injector is mounted,
The syringe pump according to any one of claims 1 to 3, wherein the abnormality detection unit is configured to detect that the pressed portion is not pressed. On the front side of the syringe mounting part, a tube insertion part is provided that guides forward through an infusion tube connected to the discharge part of the front end of the syringe,
The syringe according to any one of claims 1 to 5, wherein the valve device is configured to close an infusion tube that is inserted through the tube insertion portion by being pressed and deformed from a radially outer side. pump. A syringe pump comprising a main body part to which a syringe injector and an infusion tube can be attached, and a lid member for closing the front side of the main body part so as to be openable and closable,
The syringe mounting part is disposed on the front side of the main body part, and is formed in a concave shape capable of fitting a sideways syringe injector from the front side,
The tube insertion part is arranged to be continuous to the discharge side of the syringe mounting part on the front side of the main body part, and is formed in a concave shape capable of fitting an infusion tube extending in the lateral direction from the front side. The syringe pump according to claim 6.