Fluid delivery pump

Abstract

A fluid delivery pump according to the present disclosure comprises a pump body and a door that can be opened and closed with respect to the pump body, wherein: the door includes a moving body that can move to an allowance position from a restriction position at which the moving body prevents the door from being in a closed state from an opened state by the moving body engaging with the pump body and a receiving plate that enables a fluid delivery tube to be sandwiched between the receiving plate and a tube placement surface of the pump body; the receiving plate can rock in the circumferential direction of the tube when the fluid delivery tube is not at a tube set position; and the receiving plate includes a first stopper and a second stopper that engage with the moving body and restrict the movement of the moving body from the restriction position to the allowance position when the receiving plate rocks to one side and the other side in the circumferential direction of the tube.

Description

infusion pump

[0001] The present disclosure relates to infusion pumps.

[0002] Known infusion pumps include peristaltic infusion pumps, which infuse fluid by sequentially pressing fingers against an infusion tube, and roller infusion pumps, which infuse fluid by pressing a disk with a rotating roller against an infusion tube. Patent Document 1 discloses this type of infusion pump.

[0003] The infusion pump described in Patent Document 1 temporarily holds a detachable infusion tube in a fixed position on the main body, clamping the outer circumferential surface of the infusion tube between multiple fingers individually driven by a pump mechanism built into the main body and a receiving plate provided with a biasing force on a door pivotally supported on the main body so that the infusion tube is completely held in place. The door is fixed to the main body to completely hold the infusion tube, and the multiple fingers press against the outer circumferential surface of the infusion tube as the pump mechanism is driven, thereby delivering the infusion. The infusion pump described in Patent Document 1 also includes a stopper member that moves with a moving biasing force to engage with the receiving plate when the door is open, in order to clamp the receiving plate and immobilize it relative to the door. Furthermore, the infusion pump described in Patent Document 1 also includes a shaped portion on the main body for moving the stopper member against the moving biasing force to release the stopper member from engaging with the receiving plate when the door is moved to a closed position relative to the main body, so that the infusion tube is temporarily held in a fixed position on the main body.

[0004] Furthermore, the support plate described in Patent Document 1 is elastically supported by a compression spring.

[0005] Japanese Patent Application Laid-Open No. 2002-058738

[0006] According to the infusion pump described in Patent Document 1, if the infusion tube is not correctly set in the fixed position after the door is opened and the midpoint of the infusion tube is temporarily held in the fixed position on the main body, the stopper member will not be released from its engagement with the receiving plate, and the door cannot be closed. This prevents unintended accidents caused by operating the infusion pump with the infusion tube incorrectly attached.

[0007] However, in the infusion pump described in Patent Document 1, for example, if the midpoint of the infusion tube deviates significantly from its fixed position on the pump body and meanders, the receiving plate elastically supported by the compression spring may unintentionally swing. In such a case, depending on the direction of swing of the receiving plate, the stopper member may unintentionally release its engagement with the receiving plate, causing the door to close.

[0008] The present disclosure aims to provide an infusion pump that can prevent the door from closing even if the infusion tube is not correctly positioned at the tube set position on the pump body, causing the receiving plate to swing when the door is closed.

[0009] An infusion pump according to a first aspect of the present disclosure comprises: (1) a pump body having a tube placement surface on which a tube set position for setting an infusion tube is provided; and a door that can be opened and closed relative to the pump body between a closed state in which the door covers the tube placement surface of the pump body and is fixed in position relative to the pump body, and an open state in which the door does not cover the tube placement surface of the pump body and is movable relative to the pump body, the door comprising: a movable body that can engage with the pump body during a closing operation from the open state to the closed state, thereby moving from a restricting position that restricts the door from changing from the open state to the closed state, to an allowing position that allows the door to change from the open state to the closed state; and a receiving plate that can clamp the infusion tube between the receiving plate and the tube placement surface of the pump body during the closing operation, the receiving plate being able to swing in a circumferential direction of the infusion tube when the clamping position of the infusion tube clamped between the receiving plate and the tube placement surface of the pump body is deviated from the tube set position during the closing operation, the receiving plate comprising: The infusion pump comprises: a first stopper portion that engages with the moving body when the receiving plate swings to one side in the circumferential direction of the tube during the closing operation, and restricts the moving body from moving from the restricted position to the permissible position; and a second stopper portion that engages with the moving body when the receiving plate swings to the other side in the circumferential direction of the tube during the closing operation, and restricts the moving body from moving from the restricted position to the permissible position.

[0010] An infusion pump according to one embodiment of the present disclosure is the infusion pump described in (1) above, wherein: (2) the door is rotatably attached to the pump body around a central axis of rotation and is rotatable relative to the pump body between the closed state and the open state; and the second stopper portion is positioned closer to the central axis of rotation than the first stopper portion.

[0011] An infusion pump according to one embodiment of the present disclosure is the infusion pump described in (2) above, wherein: (3) the tube set position on the tube placement surface of the pump body is a tube placement groove in which the infusion tube can be placed; the receiving plate has: a first edge abutment portion that abuts one of the edge portions on both sides of the tube placement groove that is farther from the central axis of rotation during the closing operation; and a second edge abutment portion that abuts the other of the edge portions on both sides of the tube placement groove that is closer to the central axis of rotation during the closing operation; and when the door is in the open state, the first edge abutment portion is located inside the second edge abutment portion in the thickness direction of the door.

[0012] An infusion pump according to one embodiment of the present disclosure is the infusion pump described in (3) above, wherein: (4) the door comprises a door body that supports the movable body and the receiving plate and is rotatably attached to the pump body around the central axis of rotation; and the receiving plate is supported in an inclined position relative to the door body so that, when the door is in the open state, the first edge abutment portion is positioned inside the second edge abutment portion in the thickness direction of the door.

[0013] An infusion pump according to one embodiment of the present disclosure is an infusion pump as described in any one of (1) to (4) above, wherein: (5) the receiving plate has a protrusion protruding from the back surface opposite the receiving surface facing the pump body in the closed state; and the second stopper portion is formed by the protrusion.

[0014] An infusion pump according to one embodiment of the present disclosure is the infusion pump described in (5) above, wherein (6) the moving body is provided with a corresponding protrusion that can engage with the protrusion, and the protrusion of the receiving plate abuts against the corresponding protrusion when the receiving plate swings to the other side circumferentially of the tube during the closing operation, thereby restricting the moving body from moving from the restricted position to the allowed position.

[0015] An infusion pump according to one embodiment of the present disclosure is an infusion pump as described in any one of (1) to (6) above, wherein the pump body is provided with a receiving plate guide portion that contacts the receiving plate during the closing operation to guide the receiving plate to the position of the receiving plate in the closed state.

[0016] An infusion pump according to one embodiment of the present disclosure is an infusion pump as described in any one of (1) to (7) above, wherein the pump body comprises: a receiving plate opposing portion capable of clamping the infusion tube between the receiving plate of the door; and a sensor portion arranged on at least one of the upstream side and downstream side of the flow path of the tube set position relative to the receiving plate opposing portion, and capable of detecting the presence or absence of the infusion tube.

[0017] According to the present disclosure, an infusion pump can be provided that can prevent the door from closing even if the infusion tube is not correctly positioned at the tube set position of the pump body, causing the receiving plate to swing when the door is closed.

[0018] 7 is a diagram showing an example of the external configuration of an infusion pump according to an embodiment of the present disclosure, and is a front view of the infusion pump with the door closed relative to the pump body. FIG. 1 is a diagram showing a state in which the door is open relative to the pump body in the infusion pump shown in FIG. 1. FIG. 2 is a cross-sectional view showing an outline of the infusion unit of the infusion pump shown in FIG. 1. FIG. 3 is a perspective view showing the vicinity of the receiving plate on the back surface of the door of the infusion pump shown in FIG. 1. FIG. 4 is a perspective view showing a part of the door shown in FIG. 4 in an exploded state. FIG. 5 is a cross-sectional view taken along line II in FIG. 1, showing the door in an open state. FIG. 6 is a diagram showing a state in which the door is being closed from the state shown in FIG. 7. FIG. 7 is a diagram showing an example in which the infusion tube meanders to straddle one edge of the tube accommodating groove of the tube placement groove of the pump body. FIG. 8 is a diagram showing an example in which the infusion tube meanders to straddle the other edge of the tube accommodating groove of the tube placement groove of the pump body. FIG. 9 is a schematic view of a part of the cross section of the pump body taken along line II-II in FIG. 2.

[0019] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an infusion pump according to the present disclosure will now be described with reference to the accompanying drawings, in which the same components are designated by the same reference numerals.

[0020] 1 and 2 are diagrams illustrating an example of the external configuration of an infusion pump 100 as one embodiment of the infusion pump according to the present disclosure. As shown in FIG. 2, the infusion pump 100 includes a pump body 110 and a door 120. FIG. 1 is a front view of the infusion pump 100 with the door 120 closed relative to the pump body 110 (see FIG. 2). The infusion pump 100 illustrated in FIG. 1 also illustrates a state in which an infusion tube 50 is attached. FIG. 2 is a front view of the infusion pump 100 with the door 120 open relative to the pump body 110. Therefore, in FIG. 2, the front surface of the pump body 110 and the back surface of the door 120 are exposed. In this embodiment, the back surface of the door 120 refers to the surface that faces the front surface of the pump body 110 in the thickness direction D of the door 120 when the door 120 is closed (see FIG. 1). The infusion pump 100 illustrated in FIG. 2 also illustrates a state in which the infusion tube 50 (see FIG. 1) is not attached.

[0021] As shown in FIG. 2 , the pump body 110 has a tube placement surface 111 that is provided with a tube setting position for setting the infusion tube 50. In this embodiment, the tube placement surface 111 is the front surface of the pump body 110. As will be described in detail below, the tube setting position in this embodiment is a tube placement groove 112 formed in the tube placement surface 111. The door 120 can be opened and closed relative to the pump body 110. More specifically, the door 120 can be opened and closed relative to the pump body 110 between a closed state (see FIG. 1 ) and an open state (see FIG. 2 ). The closed state of the door 120 (see FIG. 1 ) is a state in which the door 120 covers the tube placement surface 111 of the pump body 110 and is fixed in position relative to the pump body 110. The open state of the door 120 (see FIG. 2 ) is a state in which the door 120 does not cover the tube placement surface 111 of the pump body 110 and is movable relative to the pump body 110. Hereinafter, the operation of changing the door 120 from an open state to a closed state may be simply referred to as the "closing operation" of the door 120.

[0022] When the infusion tube 50 is correctly positioned at the tube set position on the tube placement surface 111 of the pump body 110, the infusion tube 50 can be sandwiched in a desired state between the pump body 110 and the door 120 by changing the door 120 from an open state to a closed state. Here, the "desired state" refers to a state in which the infusion pump 100 can control the delivery of a liquid, such as a medicinal solution, in the infusion tube 50 according to the settings of the infusion pump 100. On the other hand, when the door 120 is changed from an open state to a closed state when the infusion tube 50 is not correctly positioned at the tube set position on the tube placement surface 111 of the pump body 110, the infusion tube 50 may not be sandwiched in a desired state between the pump body 110 and the door 120. For ease of explanation, the following description may refer to the case where the door 120 is changed from an open state to a closed state when the infusion tube 50 is not correctly positioned at the tube set position on the tube placement surface 111 of the pump body 110, as "the infusion tube 50 being incorrectly attached to the infusion pump 100."

[0023] The infusion pump 100 of this embodiment is equipped with a door-closing prevention mechanism that prevents the infusion tube 50 from being incorrectly attached to the infusion pump 100. This door-closing prevention mechanism can prevent the door 120 from changing from an open state to a closed state in a predetermined state in which the infusion tube 50 is not correctly positioned at the tube set position on the tube placement surface 111 of the pump body 110. In particular, the door-closing prevention mechanism of the infusion pump 100 of this embodiment can prevent the door 120 from changing from an open state to a closed state even if the infusion tube 50 is positioned away from the tube set position on the tube placement surface 111 of the pump body 110 in either direction on either side of the width direction B of the tube placement surface 111 (see FIG. 2 ). The "width direction B of the tube placement surface 111" referred to here means a direction perpendicular to the tube central axis direction of the infusion tube 50 that is correctly placed at the tube set position on the tube placement surface 111 of the pump body 110, and a direction that runs along the tube placement surface 111 of the pump body 110.

[0024] More specifically, the door 120 of the infusion pump 100 of this embodiment includes a receiving plate 22 that can swing in the tube circumferential direction C of the infusion tube 50 when the clamping position of the infusion tube 50, which is clamped between the door 120 and the tube placement surface 111 of the pump body 110, is deviated from the tube set position during the closing operation of the door 120. The receiving plate 22 swings to one side in the tube circumferential direction C when the infusion tube 50 is positioned away from the tube set position on the tube placement surface 111 of the pump body 110 to one side in the width direction B (see FIG. 2) of the tube placement surface 111. Furthermore, the receiving plate 22 swings to the other side in the tube circumferential direction C when the infusion tube 50 is positioned away from the tube set position on the tube placement surface 111 of the pump body 110 to the other side in the width direction B (see FIG. 2) of the tube placement surface 111.

[0025] Furthermore, the door 120 of the infusion pump 100 of this embodiment includes a movable body 21 that is movable between a restricting position that restricts the door 120 from changing from an open state to a closed state and an allowing position that allows the door 120 to change from the open state to a closed state. The above-mentioned receiving plate 22 engages with the movable body 21 when it swings to one side in the tube circumferential direction C and when it swings to the other side in the tube circumferential direction C. The engagement of the receiving plate 22 with the movable body 21 prevents the movable body 21 from moving from the restricting position to the allowing position.

[0026] In this manner, in the infusion pump 100 of this embodiment, by utilizing the above-described movable body 21 and receiving plate 22 of the door 120, it is possible to prevent the door 120 from changing from an open state to a closed state even if the infusion tube 50 is positioned away from the tube set position on the tube placement surface 111 of the pump body 110 in either direction in the width direction B (see FIG. 2 ) of the tube placement surface 111. This makes it possible to prevent the infusion tube 50 from being incorrectly attached to the infusion pump 100.

[0027] The infusion pump 100 of this embodiment will be described in detail below.

[0028] First, a case will be described in which the door 120 is changed from an open state to a closed state when the infusion tube 50 is correctly positioned at the tube set position on the tube placement surface 111 of the pump body 110. For ease of explanation, the above case may be simply referred to as "a state in which the infusion tube 50 is correctly attached to the infusion pump 100."

[0029] FIG. 1 shows the infusion tube 50 properly attached to the infusion pump 100. As shown in FIG. 1, when the infusion tube 50 is properly attached to the infusion pump 100, the infusion pump 100 can press the infusion tube 50 to deliver a liquid, such as a medicinal solution, contained in the infusion tube 50. As shown in FIG. 1, an infusion bag 161 containing a predetermined liquid, such as a medicinal solution, is connected to the upstream side of the flow path of the infusion tube 50 (the opposite direction to the flow path A) of the portion of the infusion tube 50 attached to the infusion pump 100. Furthermore, a clamp member 162 and an indwelling catheter 163 are connected to the downstream side of the flow path of the infusion tube 50 (the flow path A) of the portion of the infusion tube 50 attached to the infusion pump 100. The indwelling catheter 163 is inserted into a blood vessel, such as a vein, of the patient and left indwelling. The infusion pump 100 controls the flow rate per unit time (flow rate) of the liquid in the infusion tube 50. Therefore, the amount of liquid in the infusion bag 161 administered to the patient per unit time can be controlled by the infusion pump 100.

[0030] As shown in Figures 1 and 2, the infusion pump 100 of this embodiment includes a pump body 110 and a door 120 that is attached to the pump body 110 in an openable and closable manner. Herein, the front side of the door 120 in this embodiment refers to the side opposite the back side of the door 120 in the thickness direction D of the door 120. Hereinafter, the direction from the front side to the back side of the door 120 in the thickness direction D of the door 120 may be referred to as the "inside of the thickness direction D of the door 120." Furthermore, the direction from the back side of the door 120 to the front side in the thickness direction D of the door 120 may be referred to as the "outside of the thickness direction D of the door 120."

[0031] 1, a display unit 130 that displays various information, an operation unit 140 in which operation switches are arranged, and a door lock lever 150 are arranged on the front surface of the door 120. In addition, an operation indicator 160 is arranged on the top surface of the door 120.

[0032] The display unit 130 is arranged with a flow rate display unit 131 which switches between the set value and actual value of the infusion rate, a volume display unit 132 which switches between the planned flow rate and the accumulated flow rate, an alarm display unit 133 which displays various alarm information, and an occlusion pressure setting display unit 134 which displays the set level of the occlusion pressure of the infusion tube 50 as "L", "M", or "H".

[0033] The alarm display unit 133 further includes an air bubble detection display unit 135 that lights up when the air bubble detection sensor unit 1 (see FIG. 2 ), which will be described later, detects air bubbles in the infusion tube 50, and a low battery voltage display unit 136 that lights up when the voltage of the built-in battery of the infusion pump 100 drops. The alarm display unit 133 also includes an occlusion abnormality display unit 137 that lights up when the occlusion pressure of the infusion tube 50 reaches a set level, a door open state display unit 138 that lights up when the door 120 is in the open state, and a completion display unit 139 that lights up when the infusion is completed.

[0034] The operating unit 140 is equipped with an up / down switch 141 for setting the infusion rate and planned flow rate, a fast-forward switch 142 that allows infusion at a rate higher than the set infusion rate (mL / h) while pressed, a start switch 144 that starts infusion when pressed, a stop switch 143 that forcibly stops infusion when pressed, and a power switch 145 for turning the power of the pump body 110 on / off.

[0035] Adjacent to the power switch 145 are a power lamp 146 that lights up when a commercial power source or a DC power source is used, and a battery lamp 147 that lights up when the built-in battery is being charged and indicates the remaining charge of the built-in battery.

[0036] By operating the door lock lever 150, the door 120 can be released from its fixed state relative to the pump body 110. In other words, by operating the door lock lever 150, the door 120 can be changed from a closed state to an open state. The means for fastening the door 120 to the pump body 110 in the closed state is not particularly limited. The means for fastening the door 120 to the pump body 110 in the closed state may be realized, for example, by a claw portion 151 provided on one of the pump body 110 and the door 120, and a claw receiver 152 provided on the other. In such a case, the door lock lever 150 may be used to switch from an engaged state in which the claw portion 151 is engaged with the claw receiver 152 to an unlocked state in which the claw portion 151 is not engaged with the claw receiver 152.

[0037] In addition, the operation indicator 160 located on the top surface of the main body has the function of notifying the fluid delivery status of the infusion pump 100, and while fluid delivery is in progress, it rotates and lights up in a predetermined color (e.g., green), but if fluid delivery stops due to an abnormality, it lights up or flashes in a predetermined color (e.g., red) different from the color during fluid delivery.

[0038] Next, the configuration of the pump body 110 of the infusion pump 100 and the back surface of the door 120 will be described.

[0039] As shown in FIG. 2 , a tube setting position where an infusion tube 50 can be placed is provided on the front surface, serving as a tube placement surface 111, of the pump body 110. The pump body 110 includes an air bubble detection sensor unit 1, a liquid delivery unit 2, an occlusion sensor unit 3, a tube clamp holder 4, a release lever unit 5, and a tube guide 6. The air bubble detection sensor unit 1, the liquid delivery unit 2, the occlusion sensor unit 3, the tube clamp holder 4, the release lever unit 5, and the tube guide 6 are arranged at different positions along the infusion tube 50 placed at the tube setting position. The occlusion sensor unit 3 of this embodiment includes an upstream occlusion sensor unit 3a located upstream of the liquid delivery unit 2 in the flow path, and a downstream occlusion sensor unit 3b located downstream of the liquid delivery unit 2 in the flow path. Hereinafter, when there is no need to particularly distinguish between the upstream occlusion sensor unit 3a and the downstream occlusion sensor unit 3b, they will each be simply referred to as the “occlusion sensor unit 3.”

[0040] The air bubble detection sensor unit 1 can detect the presence or absence of air bubbles in the portion of the infusion tube 50 located at the air bubble detection position when the infusion tube 50 is properly attached to the infusion pump 100. The "air bubble detection position" here refers to a position where the air bubble detection sensor unit 1 can detect the presence or absence of air bubbles. In this embodiment, the air bubble detection position is located inside the air bubble detection groove 1a. The air bubble detection groove 1a is formed on the front surface of the pump body 110, which serves as the tube placement surface 111. The air bubble detection sensor unit 1 in this embodiment detects the presence or absence of air bubbles in the portion of the infusion tube 50 located at the air bubble detection position using a predetermined signal, such as an ultrasonic signal. In addition to detecting the presence or absence of air bubbles, the air bubble detection sensor unit 1 may also detect the presence or absence of the infusion tube 50 at the air bubble detection position.

[0041] FIG. 3 is a cross-sectional view showing an outline of the liquid delivery unit 2 of this embodiment. As shown in FIG. 3, the liquid delivery unit 2 of this embodiment includes multiple fingers 15a-15h and a drive unit 9 that drives these fingers 15a-15h. The drive unit 9 includes a motor 10 that generates a desired rotational torque, a camshaft 12 that is rotationally driven by the motor 10 via a transmission mechanism 11, a bearing 13 that supports the camshaft 12, and multiple eccentric drive cams 14a-14h that are each fixed to the camshaft 12 at individual eccentric angles. The multiple fingers 15a-15h are pressed by the multiple eccentric drive cams 14a-14h, respectively, and can move back and forth in a direction facing a receiving plate 22 of a door 120, which will be described later.

[0042] The multiple fingers 15a to 15h are arranged from the upstream side of the flow path of the infusion tube 50 toward the downstream side of the flow path (toward the liquid delivery direction A). The multiple fingers 15a to 15h are driven by the drive unit 9 described above to sequentially press and compress the infusion tube 50. This causes the infusion tube 50 to perform peristaltic motion, allowing the liquid in the infusion tube 50 to be delivered in the liquid delivery direction A. Hereinafter, when the multiple fingers 15a to 15h are referred to without any particular distinction, they will be simply referred to as "fingers 15." The liquid delivery unit 2 of this embodiment has eight fingers 15a to 15h, but the number of fingers is not limited to eight as in this embodiment and may be less than eight or nine or more.

[0043] The infusion unit 2 has a pressable position where the infusion tube 50 can be pressed by the multiple fingers 15a to 15h to send the infusion. In this embodiment, the pressable position is inside the tube accommodating groove 2a. The tube accommodating groove 2a is formed on the front surface of the pump body 110, which serves as the tube placement surface 111. When the infusion tube 50 is properly attached to the infusion pump 100, the infusion tube 50 is positioned so that it fits into the tube accommodating groove 2a. Specifically, the groove bottom of the tube accommodating groove 2a is formed by the multiple fingers 15a to 15h. Furthermore, the groove wall of the tube accommodating groove 2a is formed by the main body housing 110a of the pump body 110. When the infusion tube 50 is accommodated in the tube accommodation groove 2a of the pump body 110, the door 120 is changed from an open state to a closed state, whereby the infusion tube 50 can be clamped between the multiple fingers 15a to 15h of the liquid delivery section 2 of the pump body 110 and the receiving plate 22 of the door 120, which will be described later.

[0044] The occlusion sensor unit 3 may be composed of, for example, a permanent magnet and a pickup for analogically detecting the amount of movement of the permanent magnet. The occlusion sensor unit 3 detects the occlusion state of the infusion tube 50 by detecting the amount of movement of the permanent magnet in response to changes in internal pressure associated with the occlusion state of the infusion tube 50. More specifically, the occlusion sensor unit 3 can detect the occlusion state of the portion of the infusion tube 50 located at the occlusion detection position when the infusion tube 50 is properly attached to the infusion pump 100. The "occlusion detection position" here refers to a position at which the occlusion state can be detected by the occlusion sensor unit 3. In this embodiment, the occlusion detection position is a position sandwiched between the occlusion sensor unit 3 and an occlusion presser portion 205 (described later) of the door 120 when the door 120 is closed. However, the occlusion detection position may also be, for example, the inside of an occlusion detection groove formed on the front surface (tube placement surface 111) of the pump body 110. In addition to detecting the occlusion state, the occlusion sensor unit 3 may also detect the presence or absence of the infusion tube 50 at the occlusion detection position.

[0045] The tube clamp holding portion 4 holds the clamp attached to the infusion tube 50, and when the door 120 changes from a closed state to an open state, applies a pressing force to the clamp to temporarily press and hold the infusion tube 50.

[0046] The release lever portion 5 is operated by an operator such as a medical professional to release the pressure applied to the clamp by the tube clamp holding portion 4 (i.e., release the clamp from compressing the infusion tube 50 (see Figure 1)).

[0047] The tube guide 6 determines the position of the infusion tube 50 so that the infusion tube 50 is correctly positioned at the tube set position on the tube placement surface 111 of the pump body 110. The tube guide 6 of this embodiment includes an upstream tube guide 6a and a downstream tube guide 6b that are arranged to sandwich the infusion unit 2 between the upstream side and downstream side of the flow path. The upstream tube guide 6a and the downstream tube guide 6b are each plate-shaped portions that protrude from the tube placement surface 111. The upstream tube guide 6a and the downstream tube guide 6b each have an accommodation groove 6a1, 6b1 that can accommodate the infusion tube 50. The infusion tube 50 is accommodated in the accommodation groove 6a1 of the upstream tube guide 6a and the accommodation groove 6b1 of the downstream tube guide 6b without meandering between the upstream tube guide 6a and the downstream tube guide 6b, allowing the infusion tube 50 to be correctly accommodated in the tube accommodation groove 2a at the position of the infusion unit 2.

[0048] As shown in Figures 1 and 2, the pump body 110 may further include a handle 7 for the user to hold when carrying the infusion pump 100.

[0049] 2 , the door 120 of this embodiment is attached to the pump body 110 via a hinge portion 202 so as to be rotatable about a rotation center axis O. More specifically, the door 120 of this embodiment includes a door housing 120a that is attached to a body housing 110a, which is an exterior member of the pump body 110, so as to be rotatable about the rotation center axis O. In this way, the door 120 of this embodiment is configured to be able to be opened and closed freely relative to the pump body 110.

[0050] A door seal rubber 203 made of elastomer is arranged on the back surface of the door 120 to prevent the liquid medicine from entering the inside of the pump body 110 when the door 120 is closed.

[0051] An occlusion holder 205 is also provided on the back surface of the door 120. When the door 120 is closed relative to the pump body 110, the occlusion holder 205 abuts against the infusion tube 50 and positions the infusion tube 50 at the occlusion detection position of the occlusion sensor unit 3. Specifically, the occlusion holder 205 of this embodiment includes an upstream occlusion holder 205a located upstream of a receiving plate 22 (described later) in the flow path, and a downstream occlusion holder 205b located downstream of the receiving plate 22 (described later). When the door 120 is closed relative to the pump body 110, the upstream occlusion holder 205a abuts against the infusion tube 50 located at the occlusion detection position of the upstream occlusion sensor unit 3a, and sandwiches the infusion tube 50 between itself and the upstream occlusion sensor unit 3a. When the door 120 is closed relative to the pump body 110, the downstream occlusion holding portion 205b abuts against the infusion tube 50 located at the occlusion detection position of the downstream occlusion sensor unit 3b, and sandwiches the infusion tube 50 between the downstream occlusion sensor unit 3b and the infusion tube 50. In this way, when the infusion tube 50 is properly attached to the infusion pump 100, the infusion tube 50 is positioned at the occlusion detection position of the upstream occlusion sensor unit 3a and the occlusion detection position of the downstream occlusion sensor unit 3b.

[0052] A receiving plate 22 is disposed on the back surface of the door 120. The receiving plate 22 is disposed opposite the infusion unit 2. When the infusion tube 50 is properly attached to the infusion pump 100, the receiving plate 22 sandwiches the infusion tube 50, which is disposed in the tube accommodating groove 2a formed at the position of the infusion unit 2 of the pump body 110, between the receiving plate 22 and the fingers 15a to 15h. Each of the fingers 15a to 15h of the infusion unit 2 can press the infusion tube 50 sandwiched between the receiving plate 22 and the receiving plate 22 toward the receiving plate 22. In other words, when the infusion tube 50 is properly attached to the infusion pump 100, the receiving plate 22 supports the infusion tube 50 from the door 120 side when the infusion tube 50 is sequentially pressed by the fingers 15a to 15h of the infusion unit 2.

[0053] Next, a detailed description will be given of the door closing prevention mechanism of the infusion pump 100 of this embodiment. As described above, the infusion pump 100 of this embodiment is provided with a door closing prevention mechanism that prevents the door 120 from changing from an open state to a closed state when the infusion tube 50 is not correctly positioned at the tube setting position on the tube placement surface 111 of the pump body 110.

[0054] FIG. 4 is a perspective view showing the vicinity of the receiving plate 22 on the back surface of the door 120. FIG. 5 is a perspective view showing a portion of the door 120 shown in FIG. 4 in an exploded state. FIGS. 6 to 8 are views showing details of the door-closing prevention mechanism. Specifically, FIG. 6 is a cross-sectional view taken along line II in FIG. 1 , showing the open state of the door 120. FIG. 7 is a view showing the state in which the door 120 is being closed from the state shown in FIG. 6 . FIG. 8 is a view showing the closed state of the door 120, in which the closing operation of the door 120 has progressed from the state shown in FIG. 7 and the door 120 is fixed relative to the pump body 110. FIGS. 6 to 8 show the closing operation of the door 120 when the infusion tube 50 is correctly positioned in the tube placement groove 112, which serves as a tube set position, provided on the tube placement surface 111 of the pump body 110.

[0055] As shown in FIGS. 4 to 8, the door 120 includes a moving body 21, a receiving plate 22, a first biasing member 23, a second biasing member 24, and a door body 25.

[0056] When the infusion tube 50 is properly positioned in the tube placement groove 112 of the pump body 110, the movable body 21 engages with the pump body 110 during a closing operation that changes the door 120 from an open state to a closed state, thereby moving from a restricting position (see FIGS. 6 and 7 ) to an allowing position (see FIG. 8 ). The "restricting position" here refers to a position that restricts the door 120 from changing from an open state to a closed state. The "allowing position" refers to a position that allows the door 120 to change from an open state to a closed state. Specifically, the movable body 21 of this embodiment is movably held relative to the rear surface of the door housing 120a, which is part of the door body 25. The direction of movement of the movable body 21 relative to the door body 25 of this embodiment is the door width direction of the door 120. In other words, the direction of movement of the movable body 21 relative to the door body 25 of this embodiment is the width direction B (see FIG. 2 ) of the tube placement surface 111 of the pump body 110 when the door 120 is in the closed state. In this embodiment, the width direction B of the tube placement surface 111 is the groove width direction of the tube placement groove 112 which serves as the tube setting position of the pump body 110.

[0057] As shown in FIGS. 6 to 8 , when the door 120 is closed, the movable body 21 comes into contact with an operation protrusion 113 protruding from the front surface serving as the tube placement surface 111 of the pump body 110, thereby being movable in the width direction B of the tube placement surface 111 from a restricted position (see FIGS. 6 and 7 ) to an allowable position (see FIG. 8 ) against the restoring force of a coil spring serving as a first biasing member 23 (described later). Specifically, when the door 120 is closed, the operation protrusion 113 of the pump body 110 slides against an inclined surface portion 21 e of the movable body 21 that extends at an angle with respect to the thickness direction D of the door 120. As a result, the movable body 21 is pressed and moved in the width direction B of the tube placement surface 111. In this way, the movable body 21 moves from the restricted position (see FIGS. 6 and 7 ) to the allowable position (see FIG. 8 ), thereby changing the door 120 from an open state to a closed state.

[0058] Furthermore, the movable body 21 of this embodiment includes a first corresponding protrusion 21a and a second corresponding protrusion 21b that can be engaged with a first protrusion 33a and a second protrusion 33b of the receiving plate 22, which will be described later. The first corresponding protrusion 21a and the second corresponding protrusion 21b are configured to engage with the first protrusion 33a and the second protrusion 33b of the receiving plate 22 when the receiving plate 22 swings in the tube circumferential direction C, as will be described later. This will be described in detail later.

[0059] When the door 120 is closed, the receiving plate 22 can sandwich the infusion tube 50 between itself and the tube placement surface 111 of the pump body 110. The receiving plate 22 of this embodiment is elastically supported in the thickness direction D of the door 120 against the back surface of the door housing 120a, which is part of the door body 25, via a coil spring serving as the second biasing member 24. That is, the receiving plate 22 of this embodiment can move in the thickness direction D as the second biasing member 24 elastically deforms in the thickness direction D. Therefore, as shown in FIG. 8 , when the infusion tube 50 is properly attached to the infusion pump 100, the restoring force of the coil spring serving as the second biasing member 24 causes the receiving plate 22 to press the infusion tube 50 against the finger 15 of the infusion unit 2 of the pump body 110.

[0060] Furthermore, when the receiving plate 22 is closing the door 120, if the clamping position of the infusion tube 50 sandwiched between the receiving plate 22 and the tube placement surface 111 of the pump body 110 is out of the tube placement groove 112, which serves as the tube set position, the receiving plate 22 can swing in the tube circumferential direction C of the infusion tube 50. This swinging of the receiving plate 22 can prevent the door 120 from changing from the open state to the closed state. This will be described in detail later (see FIGS. 9 and 10 ).

[0061] The first biasing member 23 biases the movable body 21 to maintain the movable body 21 in the restricted position (see FIGS. 6 and 7 ). In this embodiment, the first biasing member 23 is a coil spring, and is disposed in a compressed and deformed state between the movable body 21 and the door housing 120a, which is part of the door main body 25. As described above, when the door 120 is closed, the operation convex portion 113 of the pump main body 110 presses the inclined surface portion 21e of the movable body 21, causing the first biasing member 23 to be further compressed and deformed. This allows the movable body 21 to move from the restricted position (see FIGS. 6 and 7 ) to the allowed position (see FIG. 8 ).

[0062] When the door 120 is closed, the second biasing member 24 biases the receiving plate 22 toward the pump body 110. More specifically, the second biasing member 24 in this embodiment is a coil spring that elastically supports the receiving plate 22 in the thickness direction D. Only one coil spring may be provided as the second biasing member 24, or multiple coil springs may be provided to support the receiving plate 22 at different positions. When the door 120 is closed with the infusion tube 50 correctly positioned in the tube placement groove 112 of the pump body 110, the infusion tube 50 presses the second biasing member 24 via the receiving plate 22. As a result, as shown in FIG. 8 , the second biasing member 24 is compressed and deformed in the thickness direction D. The restoring force of this compressed second biasing member 24 allows the infusion tube 50 to be stably sandwiched between the receiving plate 22 and the fingers 15 of the pump body 110.

[0063] The door body 25 directly or indirectly supports the movable body 21, the receiving plate 22, the first biasing member 23, and the second biasing member 24. The door body 25 is attached to the pump body 110 so as to be rotatable about the rotation center axis O. The door body 25 of this embodiment includes the door housing 120a, which is an exterior member of the door 120. At least a portion of the door housing 120a is exposed on the front and rear surfaces of the door 120. The door housing 120a may be a single, integrally molded member, or may be an assembled member formed by integrally assembling multiple members. When the door 120 is closed, the door body 25 engages with the pump body 110, thereby being fixed in position by the pump body 110.

[0064] When the door 120 is closed, the door body 25 can rotate around the rotation center axis O to a position fixed by the pump body 110 as the above-mentioned moving body 21 moves from the restricted position (see Figures 6 and 7) to the allowed position (see Figure 8).

[0065] Next, with reference to Figures 9 and 10, the operation of the door closing prevention mechanism when the infusion tube 50 is not correctly positioned in the tube placement groove 112 of the pump body 110 will be described.

[0066] First, the tube placement groove 112 of this embodiment extends intermittently from the upstream end of the flow path on the front surface, which serves as the tube placement surface 111, of the pump body 110 to the downstream end of the flow path on the front surface of the pump body 110. In other words, the tube placement groove 112 of this embodiment is formed intermittently in the liquid delivery direction A, and includes the air bubble detection groove 1a of the air bubble detection sensor unit 1 of the pump body 110, the accommodation groove 6a1 of the upstream tube guide 6a, the tube accommodation groove 2a located in the liquid delivery unit 2, the accommodation groove 6b1 of the downstream tube guide 6b, and the housing groove 110b formed in the main body housing 110a on the front surface of the pump body 110. However, the configuration of the tube placement groove 112 is not limited to the above configuration. Although the occlusion detection position of the occlusion sensor unit 3 of this embodiment is not defined by the occlusion detection groove, the occlusion detection position of the occlusion sensor unit 3 may be defined by the occlusion detection groove that constitutes part of the tube placement groove 112. In addition, the tube placement groove 112 may extend continuously from the upstream end of the flow path on the front surface of the pump body 110, which serves as the tube placement surface 111, to the downstream end of the flow path on the front surface of the pump body 110.

[0067] 9 shows an example in which the infusion tube 50 snakes to one side in the width direction B (the right side in FIG. 9 ) so as to straddle one edge 2a1 (the right edge in FIG. 9 ) of the tube accommodating groove 2a of the tube placement groove 112 of the pump body 110. In this case, when the door 120 is moved from the open state to the closed state, the infusion tube 50 is sandwiched between one edge 2a1 (the right edge in FIG. 9 ) of the tube accommodating groove 2a of the pump body 110 and the receiving plate 22 of the door 120 before the operating protrusion 113 of the pump body 110 abuts against the inclined surface 21e of the movable body 21. As a result, the receiving plate 22 swings to one side in the tube circumferential direction C (the counterclockwise direction C1 in FIG. 9 ).

[0068] Here, the receiving plate 22 includes a first stopper portion 22a. When the receiving plate 22 swings toward one side in the tube circumferential direction C (counterclockwise direction C1 in FIG. 9 ) during the closing operation of the door 120, the first stopper portion 22a engages with the moving body 21 and prevents the moving body 21 from moving from the restricted position (see FIG. 9 ) to the permitted position (see FIG. 8 ). More specifically, the moving body 21 of this embodiment abuts against the first stopper portion 22a in the width direction B, thereby preventing the moving body 21 from moving in the width direction B from the restricted position to the permitted position. The receiving plate 22 of this embodiment includes a first protrusion 33a protruding from the back surface 32 on the side opposite the receiving surface 31 that faces the pump body 110 when the door 120 is closed. The first stopper portion 22a of this embodiment is configured by this first protrusion 33a. In this embodiment, the moving body 21 is restricted from moving from the restricted position to the permitted position by hitting the side surface of the first protrusion 33a, which serves as the first stopper portion 22a.

[0069] More specifically, the movable body 21 of this embodiment includes a first corresponding protrusion 21a that can engage with a first protrusion 33a serving as a first stopper portion 22a of the receiving plate 22. When the receiving plate 22 swings to one side in the tube circumferential direction C (counterclockwise direction C1 in FIG. 9 ) during the closing operation, the first protrusion 33a of the receiving plate 22 abuts against the first corresponding protrusion 21a, thereby restricting the movable body 21 from moving from the restricted position (see FIG. 9 ) to the allowed position (see FIG. 8 ).

[0070] 10 shows an example in which the infusion tube 50 snakes to the other side in the width direction B (left side in FIG. 10 ) so as to straddle the other edge 2a2 (left edge in FIG. 10 ) of the tube accommodating groove 2a of the tube placement groove 112 of the pump body 110. In this case, when the door 120 is moved from the open state to the closed state, the infusion tube 50 is sandwiched between the other edge 2a2 (left edge in FIG. 10 ) of the tube accommodating groove 2a of the pump body 110 and the receiving plate 22 of the door 120 before the operating protrusion 113 of the pump body 110 abuts against the inclined surface 21e of the movable body 21. As a result, the receiving plate 22 swings to the other side in the tube circumferential direction C (clockwise direction C2 in FIG. 10 ).

[0071] Here, the receiving plate 22 includes a second stopper portion 22b in addition to the first stopper portion 22a described above. When the receiving plate 22 swings toward the other side of the tube circumferential direction C (clockwise direction C2 in FIG. 10 ) during the closing operation of the door 120, the second stopper portion 22b engages with the moving body 21 and prevents the moving body 21 from moving from the restricted position (see FIG. 10 ) to the permitted position (see FIG. 8 ). More specifically, the moving body 21 of this embodiment abuts against the second stopper portion 22b in the width direction B, thereby preventing the moving body 21 from moving in the width direction B from the restricted position to the permitted position. The receiving plate 22 of this embodiment includes a second protrusion portion 33b protruding from the back surface 32 opposite the receiving surface 31 that faces the pump body 110 when the door 120 is closed. The second stopper portion 22b of this embodiment is configured by this second protrusion portion 33b. In this embodiment, the moving body 21 is restricted from moving from the restricted position to the permitted position by hitting the side surface of the second protrusion 33b, which serves as the second stopper portion 22b.

[0072] More specifically, the movable body 21 of this embodiment includes a second corresponding protrusion 21b that can engage with a second protrusion 33b serving as a second stopper portion 22b of the receiving plate 22. When the receiving plate 22 swings to the other side in the tube circumferential direction C (clockwise direction C2 in FIG. 10) during the closing operation, the second protrusion 33b of the receiving plate 22 abuts against the second corresponding protrusion 21b, thereby restricting the movable body 21 from moving from the restricted position (see FIG. 10) to the allowed position (see FIG. 8).

[0073] In this embodiment, the second protrusion 33b serving as the second stopper portion 22b is positioned closer to the rotation center axis O in a plane perpendicular to the rotation center axis O relative to the first protrusion 33a serving as the first stopper portion 22a.

[0074] As described above, the door closing prevention mechanism of the infusion pump 100 can prevent the door 120 from changing from an open state to a closed state not only when the infusion tube 50 snakes to one side in the width direction B so as to straddle one edge 2a1 of the tube accommodating groove 2a of the pump body 110 (see Figure 9), but also when the infusion tube 50 snakes to the other side in the width direction B so as to straddle the other edge 2a2 of the tube accommodating groove 2a of the pump body 110 (see Figure 10).

[0075] As described above, the receiving plate 22 of this embodiment is elastically supported in the thickness direction D by the coil spring serving as the second biasing member 24. The coil spring serving as the second biasing member 24 elastically bends and deforms in a direction perpendicular to the thickness direction D, allowing the receiving plate 22 of this embodiment to swing in the tube circumferential direction C of the infusion tube 50.

[0076] As described above, the door 120 of this embodiment is rotatably attached to the pump body 110 around the central rotation axis O and is rotatable with respect to the pump body 110 between a closed state and an open state. Furthermore, the receiving plate 22 of this embodiment includes a first edge abutment portion 22c and a second edge abutment portion 22d. As shown in FIGS. 6 to 8 , when the infusion tube 50 is correctly positioned in the tube placement groove 112 of the pump body 110, the first edge abutment portion 22c abuts against one edge 2a1 of both side edges of the tube accommodating groove 2a of the tube placement groove 112 that is farthest from the central rotation axis O during the closing operation of the door 120. Furthermore, as shown in Figures 6 to 8, when the infusion tube 50 is correctly positioned in the tube placement groove 112 of the pump body 110, the second edge abutment portion 22d abuts against the other edge portion 2a2 on both sides of the tube accommodating groove 2a of the tube placement groove 112 that is closer to the rotation center axis O when the door 120 is closed.

[0077] As shown in Figures 6 and 7, in this embodiment, when the door 120 is in an open state, the positions of the first edge abutment portion 22c and the second edge abutment portion 22d in the thickness direction D are different. Specifically, when the door 120 is in an open state (see Figures 6 and 7), the first edge abutment portion 22c is located inside the second edge abutment portion 22d in the thickness direction D of the door 120. This allows the door 120 to rotate around the rotation axis O, and the timing at which the second edge abutment portion 22d abuts against the edge portion 2a2 close to the rotation axis O and the timing at which the first edge abutment portion 22c abuts against the edge portion 2a1 far from the rotation axis O to be synchronized during the closing operation of the door 120. In other words, the difference between the two abutment timings due to the difference in the positions of the first edge abutment portion 22c and the second edge abutment portion 22d in the radial direction about the rotation axis O can be reduced or eliminated. This makes it easier to substantially match the position of the door 120 about the pivot axis O at the timing when the receiving plate 22 is swung to one side in the tube circumferential direction C by the infusion tube 50 shown in Fig. 9 with the position of the door 120 about the pivot axis O at the timing when the receiving plate 22 is swung to the other side in the tube circumferential direction C by the infusion tube 50 shown in Fig. 10. Therefore, regardless of whether the infusion tube 50 is in the position shown in Fig. 9 or the position shown in Fig. 10, the receiving plate 22 can be swung at an appropriate timing to more reliably prevent the moving body 21 from moving from the restricted position (see Figs. 9 and 10) to the permitted position (see Fig. 8).

[0078] Specifically, as shown in FIG. 6 , the receiving plate 22 of this embodiment is supported in an inclined position relative to the door main body 25 so that, when the door 120 is in an open state, the first edge abutment portion 22c is positioned inward in the thickness direction D of the door 120 relative to the second edge abutment portion 22d (see symbol "θ" in FIG. 6 ). More specifically, the receiving plate 22 of this embodiment is supported relative to the door housing 120a of the door main body 25 in an inclined position so that the outer side in the radial direction about the pivot central axis O is inclined inward in the thickness direction D of the door 120. As described above, the receiving plate 22 of this embodiment is biased inward in the thickness direction D of the door 120 by the second biasing member 24. Therefore, the above-described inclined position may be maintained by, for example, being supported by a positioning member 218 (see FIGS. 4 and 5 ) from the inside of the thickness direction D of the door 120. The positioning member 218 may have any configuration as long as it can maintain the inclined position of the receiving plate 22 as described above, and the shape thereof is not particularly limited.

[0079] Fig. 11 is a schematic diagram of a portion of the cross section of the pump body 110 taken along line II-II in Fig. 2. As shown in Fig. 11, the pump body 110 of this embodiment includes a receiving plate guide portion 114 that guides the receiving plate 22 (see the dashed line in Fig. 11) of the door 120 when the door 120 is closed. The receiving plate guide portion 114 abuts against the receiving plate 22 when the door 120 is closed, thereby guiding the receiving plate 22 to a position where the door 120 is in the closed state. More specifically, the receiving plate guide portion 114 of this embodiment is composed of a side surface 6a2 located downstream of the upstream tube guide 6a in the flow path (in the liquid feed direction A) and a side surface 6b2 located upstream of the downstream tube guide 6b in the flow path (in the opposite direction to the liquid feed direction A). The side surface 6a2 of the upstream tube guide 6a is inclined from the distal end of the upstream tube guide 6a protruding from the tube placement surface 111 toward the proximal end thereof so as to approach the fingers 15 of the liquid delivery unit 2 on the downstream side of the flow path. The side surface 6b2 of the downstream tube guide 6b is inclined from the distal end of the downstream tube guide 6b protruding from the tube placement surface 111 toward the proximal end thereof so as to approach the fingers 15 of the liquid delivery unit 2 on the upstream side of the flow path. Therefore, when the receiving plate 22, shown by the dashed line in FIG. 11 , moves between the upstream tube guide 6a and the downstream tube guide 6b during the closing operation of the door 120, the upstream end surface of the receiving plate 22 is guided by contacting the side surface 6a2 of the upstream tube guide 6a. The downstream end surface of the receiving plate 22 is guided by contacting the side surface 6b2 of the downstream tube guide 6b. This allows the receiving plate 22 to be guided to an appropriate position when the door 120 is closed.

[0080] As described above, the infusion pump 100 of this embodiment includes a door closure prevention mechanism that prevents the infusion tube 50 from being incorrectly attached to the infusion pump 100. However, in addition to the door closure prevention mechanism, the infusion pump 100 may also include a means for preventing the infusion tube 50 from being incorrectly attached to the infusion pump 100. As shown in FIG. 2 , the pump body 110 of this embodiment includes a receiving plate facing portion 115 that can sandwich the infusion tube 50 between itself and the receiving plate 22 of the door 120. In this embodiment, the receiving plate facing portion 115 refers to the tube accommodating groove 2a and the portions of the tube placement surface 111 adjacent to both sides of the tube accommodating groove 2a in the width direction B. The pump body 110 of this embodiment also includes a sensor unit 116 that is disposed on at least one of the upstream and downstream sides of the tube placement groove 112, which serves as a tube setting position, relative to the receiving plate facing portion 115 and is capable of detecting the presence or absence of the infusion tube 50. The infusion pump 100 of this embodiment includes three sensors 116. Specifically, the infusion pump 100 of this embodiment includes an air bubble detection sensor 1 serving as the sensor unit 116. The air bubble detection sensor 1 is disposed upstream of the flow path relative to the backing plate facing portion 115. The infusion pump 100 of this embodiment also includes an upstream occlusion sensor 3a serving as the sensor unit 116. The upstream occlusion sensor 3a is disposed upstream of the flow path relative to the backing plate facing portion 115. The infusion pump 100 of this embodiment also includes a downstream occlusion sensor 3b serving as the sensor unit 116. The downstream occlusion sensor 3b is disposed downstream of the flow path relative to the backing plate facing portion 115.

[0081] The air bubble detection sensor 1 of this embodiment can detect whether the infusion tube 50 is placed in the air bubble detection groove 1a. Furthermore, the upstream occlusion sensor 3a and the downstream occlusion sensor 3b can each detect whether the infusion tube 50 is placed at the occlusion detection position. Therefore, according to the infusion pump 100 of this embodiment, the door closure prevention mechanism described above can prevent the infusion tube 50 from being erroneously attached to the infusion pump 100. Even if the infusion tube 50 is erroneously attached to the infusion pump 100 at a position other than the position corresponding to the door closure prevention mechanism, the air bubble detection sensor 1, the upstream occlusion sensor 3a, and the downstream occlusion sensor 3b can detect the erroneous attachment of the infusion tube 50.

[0082] The infusion pump according to the present disclosure is not limited to the specific configurations shown in the above-described embodiments, and various modifications, alterations, and combinations are possible without departing from the scope of the claims.

[0083] The present disclosure relates to infusion pumps.

[0084] 1: Air bubble detection sensor section (an example of a sensor section) 1a: Air bubble detection groove 2: Liquid delivery section 2a: Tube accommodating groove (an example of a part of a tube arrangement groove) 2a1: One edge of the tube accommodating groove 2a2: The other edge of the tube accommodating groove 3: Occlusion sensor section (an example of a sensor section) 3a: Upstream occlusion sensor section 3b: Downstream occlusion sensor section 4: Tube clamp holding section 5: Release lever section 6: Tube guide 6a: Upstream tube guide 6a1: Accommodating groove of upstream tube guide 6a2: Side surface of upstream tube guide (an example of a receiving plate guide section) 6b: Downstream tube guide 6b1: Accommodating groove of downstream tube guide 6a2: Side surface of downstream tube guide (an example of a receiving plate guide section) 7: Handle 9: Drive section 10: Motor 11: Transmission mechanism 12: Camshaft 13: Bearings 14a to 14h: Eccentric drive cam 15, 15a to 15h: Finger 21: Moving body 21a: First corresponding protrusion 21b: Second corresponding protrusion 21e: Inclined surface portion 22: Receiving plate 22a: First stopper portion 22b: Second stopper portion 22c: First edge abutment portion 22d: Second edge abutment portion 25: Door body 31: Receiving surface of receiving plate 32: Back surface 33a: First protrusion portion (an example of a first stopper portion) 33b: Second protrusion portion (an example of a second stopper portion) 100: Infusion pump 110: Pump body 110a: Main body housing 110b: Housing groove 111: Tube placement surface 112: Tube placement groove (an example of a tube setting position) 113: Operation convex portion 114: Receiving plate guide portion 115: Receiving plate opposing portion 116: Sensor portion 120: Door 120a: Door housing 130: Display 131: Flow rate display 132: Volume display 133: Alarm display 134: Occlusion pressure setting display 135: Air bubble detection display 136: Low battery voltage display 137: Occlusion abnormality display 138: Door open status display 139: Completion display 140: Operation unit 141: Up / down switch 142: Fast forward switch 143: Stop switch 144: Start switch 145: Power switch 146: Power lamp 147: Battery lamp 150: Door lock lever 151: Claw portion 152: Claw receiving portion 160: Operation indicator 161: Infusion bag 162: Clamp member 163: Indwelling catheter 202: Hinge portion 203: Door seal rubber 205: Occlusion pressing portion205a: Upstream occlusion holding portion 205b: Downstream occlusion holding portion 218: Positioning member A: Liquid sending direction B: Width direction C: Tube circumferential direction C1: One side direction in the tube circumferential direction C2: The other side direction in the tube circumferential direction D: Door thickness direction O: Rotation center axis

Claims

1. A pump body having a tube placement surface on which a tube set position for setting an infusion tube is provided; and a door that can be opened and closed relative to the pump body between a closed state in which the door covers the tube placement surface of the pump body and is fixed in position relative to the pump body, and an open state in which the door does not cover the tube placement surface of the pump body and is movable relative to the pump body, wherein the door is a movable body that can engage with the pump body during a closing operation from the open state to the closed state, thereby moving from a restricting position that restricts the door from changing from the open state to the closed state, to an allowing position that allows the door to change from the open state to the closed state; and a receiving plate that can clamp the infusion tube between the receiving plate and the tube placement surface of the pump body during the closing operation, wherein the receiving plate can swing in the circumferential direction of the infusion tube when the clamping position of the infusion tube clamped between the receiving plate and the tube placement surface of the pump body is deviated from the tube set position during the closing operation, and the receiving plate is an infusion pump comprising: a first stopper portion that engages with the moving body when the receiving plate swings to one side in the circumferential direction of the tube during the closing operation, and restricts the moving body from moving from the restricted position to the allowed position; and a second stopper portion that engages with the moving body when the receiving plate swings to the other side in the circumferential direction of the tube during the closing operation, and restricts the moving body from moving from the restricted position to the allowed position.

2. An infusion pump as described in claim 1, wherein the door is attached to the pump body so as to be rotatable around a central axis of rotation and is rotatable relative to the pump body between the closed state and the open state, and the second stopper portion is positioned closer to the central axis of rotation than the first stopper portion.

3. An infusion pump as described in claim 2, wherein the tube set position on the tube placement surface of the pump body is a tube placement groove in which the infusion tube can be placed, and the receiving plate has: a first edge abutment portion that abuts against one of the edge portions on both sides of the tube placement groove that is farther from the central axis of rotation during the closing operation; and a second edge abutment portion that abuts against the other edge portion on both sides of the tube placement groove that is closer to the central axis of rotation during the closing operation, and when the door is in the open state, the first edge abutment portion is located inside the second edge abutment portion in the thickness direction of the door.

4. An infusion pump as described in claim 3, wherein the door comprises a door body that supports the movable body and the receiving plate and is attached to the pump body so as to be rotatable around the rotation center axis, and the receiving plate is supported in an inclined position relative to the door body so that, when the door is in the open state, the first edge abutment portion is positioned inside the second edge abutment portion in the thickness direction of the door.

5. An infusion pump as described in any one of claims 1 to 4, wherein the receiving plate has a protrusion protruding from the back surface opposite the receiving surface that faces the pump body in the closed state, and the second stopper portion is formed by the protrusion.

6. An infusion pump as described in claim 5, wherein the movable body is provided with a corresponding protrusion that can engage with the protrusion, and the protrusion of the receiving plate abuts against the corresponding protrusion when the receiving plate swings to the other side in the circumferential direction of the tube during the closing operation, thereby restricting the movable body from moving from the restricted position to the permissible position.

7. An infusion pump as described in any one of claims 1 to 4, wherein the pump body is provided with a receiving plate guide portion that abuts against the receiving plate during the closing operation, thereby guiding the receiving plate to its position in the closed state.

8. An infusion pump as described in any one of claims 1 to 4, wherein the pump body comprises: a receiving plate opposing portion capable of clamping the infusion tube between itself and the receiving plate of the door; and a sensor portion arranged on at least one side of the receiving plate opposing portion, upstream and downstream of the tube set position in the flow path, capable of detecting the presence or absence of the infusion tube.

Images