JP2015021458A - Infusion pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an infusion pump having closing fingers capable of sufficiently pressing an infusion tube and completely closing its inner cavity even if it shows dimension error.SOLUTION: This invention comprises: a pump main body having a tube clamp face formed with a groove for arranging an infusion tube; a cover member attached to the pump main body in such a manner that it may be oscillated in respect to the pump main body and having a protrusion fitted into the tube groove; a plurality of fingers for pressing the infusion tube while being forwarded or retracted in respect to the infusion tube installed in the tube groove; and a driving part for forwarding or retracting the plurality of fingers, the invention is constituted by a plurality of closing fingers 521 for depressing the infusion tube to close its inner cavity and a plurality of liquid feed fingers for depressing the infusion tube in such a degree as not to close the inner cavity. The closing fingers 521 comprise a main body part 541 extending in one direction and a movable part 542 installed at the main body part 541, enabled to be reciprocated in one direction to press the infusion tube and the movable part 542 is biased in such a direction as to be protruded from the main body part 541.

Description

  The present invention relates to an infusion pump.

  Conventionally, infusion pumps have been proposed in which infusion fluid is delivered by sequentially pressing the outer peripheral surface of an infusion tube with a plurality of fingers. For example, in the infusion pump in Patent Document 1, each finger is formed in a rod shape and is supported so as to be able to advance and retreat with respect to the infusion tube. The plurality of fingers are composed of a closing finger that crushes the infusion tube to close the lumen, and a liquid feeding finger that crushes the lumen so as not to close the lumen. The closing finger has a function of preventing an infusion from flowing continuously by crushing the infusion tube and storing an appropriate amount of the infusion in the tube. On the other hand, the liquid feeding finger has a function of sequentially pressing the infusion tube and imparting a peristaltic motion to the infusion tube. Specifically, after the closing finger stores an appropriate amount of infusion, release the pressure and flow the infusion. At this time, when the peristaltic motion is given to the infusion tube with the infusion finger, the infusion of the set flow rate is delivered. be able to.

Japanese Patent No. 3595135

  However, since the closing finger of the infusion pump as described above is formed in a rod shape, if a dimensional error occurs, the infusion tube cannot be pressed sufficiently and the lumen may not be completely closed. There is. When the lumen cannot be completely closed in this way, there is a problem that the infusion solution flows continuously and the flow rate cannot be controlled.

  The present invention has been made to solve the above-described problem, and even when a dimensional error occurs, the infusion pump having a closing finger that can sufficiently press the infusion tube and completely close the lumen. The purpose is to provide.

  The present invention is an infusion pump that presses the outer peripheral surface of an infusion tube to deliver liquid, the pump main body having a tube mounting surface in which a tube groove for arranging the infusion tube is formed, and the pump main body. And a cover body that is swingably attached to the pump body via the hinge so as to close the tube attachment surface of the pump body, and has a protrusion that fits into the tube groove, A plurality of fingers that are arranged along the tube groove of the pump main body and pressed against the infusion tube attached to the tube groove, and a drive unit that advances and retracts the plurality of fingers, The plurality of fingers crush the infusion tube to close the lumen of the infusion tube, and the inside of the infusion tube At least one liquid feeding finger that pushes the liquid so as not to be closed, and each closing finger is attached to the main body portion and is reciprocally movable in the one direction so as to reciprocate in the one direction. A movable portion that presses the tube, and the movable portion is biased in a direction protruding from the main body portion.

  According to this configuration, the closing finger is configured by the main body portion and a movable portion that can reciprocate with respect to the main body portion, and the movable portion is biased in a direction protruding from the main body portion, so that a manufacturing error, etc. Even if this occurs, manufacturing errors can be absorbed by moving the movable part back and forth with respect to the main body part. As a result, the infusion tube can be reliably pressed so as to close the lumen.

  The said infusion pump WHEREIN: The said protrusion part can have a flat surface contact | abutted with the said infusion tube.

  In this way, the infusion tube is sandwiched between the ridge and the finger, but the ridge has a flat surface, so in the infusion tube, the surface on the ridge side. Is statically supported by the flat surface, and the surface opposite to the finger on the opposite side is deformed by pressing. Therefore, the pressing force from the fingers can be reliably applied. On the other hand, when receiving deformation from both sides of the infusion tube, the infusion tube may meander, and there is a possibility that the pressing force from the fingers cannot be reliably applied. Therefore, in the infusion pump according to the present invention, the infusion tube can be surely pressed by the closing finger, and an infusion of an accurate flow rate can be supplied.

  When the closing finger of the infusion pump according to the present invention is used, even when a dimensional error occurs, the infusion tube can be sufficiently pressed and the lumen can be completely closed.

It is a perspective view of the infusion pump concerning one embodiment of the present invention. FIG. 2 is a perspective view showing a state where a cover pair is opened in the infusion pump of FIG. 1. It is sectional drawing of a pump mechanism. They are a perspective view (a) of a closing finger, and a line sectional view (b). It is a perspective view of a support plate. It is the perspective view which looked at the receiving plate from the back side. It is sectional drawing which shows a mode that a cover body is closed normally. It is sectional drawing which shows a mode that a cover body is closed normally. It is sectional drawing which shows a mode that a cover body is closed normally. It is sectional drawing which shows a mode that a cover body is closed when an infusion tube is mismounted.

  Hereinafter, an embodiment of an infusion pump according to the present invention will be described with reference to the drawings. FIG. 1 is a perspective view of an infusion pump. This infusion pump includes a rectangular parallelepiped pump body 1 and a cover body 3 that is swingably attached to the pump body 1 by a hinge 2. In this infusion pump, the infusion tube 4 is sandwiched between the pump main body 1 and the cover body 3, and a peristaltic motion is performed on the infusion tube 4 by a plurality of fingers to be described later. Is delivered at a predetermined flow rate. An infusion bag (not shown) containing the infusion solution is attached upstream of the infusion tube 4, and the infusion solution is sent from the infusion bag to the infusion tube 4. On the other hand, a puncture needle (not shown) or the like to be inserted into a patient's vein or the like is attached downstream of the infusion tube 4, and a desired amount of infusion flowing through the infusion tube is supplied to the patient by an infusion pump. Hereinafter, the infusion pump will be described in detail.

<1. Pump body>
FIG. 2 is a perspective view showing a state in which the cover pair is opened in this infusion pump. As shown in FIG. 2, in the pump main body 1, a surface facing the cover body 3, that is, a surface closed by the cover body 3 constitutes a tube mounting surface 11 for mounting the infusion tube. A pump mechanism 5 is mounted on the tube mounting surface 11 above the center in the vertical direction, and a tube groove 6 into which the infusion tube 4 is fitted in the vertical direction is formed with the pump mechanism 5 interposed therebetween. Here, the upper tube groove of the pump mechanism 5 is referred to as an upper tube groove 61, the lower tube groove of the pump mechanism 5 is referred to as a lower tube groove 62, and the tube groove formed in the pump mechanism 5 is referred to as a central tube groove 63. It shall be called. The upper tube groove and the lower tube groove are provided with clamps for sandwiching the tube.

  The pump mechanism 5 includes a pair of substrates 51 disposed on both sides of the central tube groove 63. That is, the gap between the substrates 51 forms the central tube groove 63. Here, the board | substrate arrange | positioned at the hinge 2 side is called the 1st board | substrate 51a, and the board | substrate arrange | positioned on the opposite side (right side of FIG. 2) from the hinge 2 shall be called the 2nd board | substrate 51b. Each of the substrates 51a and 51b is formed in a rectangular shape, and side protrusions 511a and 511b extending along the groove are formed at the end on the central tube groove 63 side. Further, restricting plates 512a and 512b are formed at both ends in the vertical direction, and a receiving plate 34 of the cover body 3 described later is arranged between the restricting plates 512a and 512b. A guide member 12 is provided on the right side of the second substrate 51b. The guide member 12 is formed in a plate shape that protrudes from the tube mounting surface 11 toward the cover body 3 and extends in the vertical direction. Further, in the guide member 12, an inclined surface 121 is formed on the surface on the second substrate 51b side so as to descend from the tip toward the substrate 51b side. As will be described later, the guide member 12 is a member that engages with the receiving plate 34 of the cover body 3.

  Next, a structure for causing the infusion tube 4 to perform a peristaltic motion in the pump mechanism 5 will be described with reference to FIG. FIG. 3 is a sectional view of the pump mechanism. A plurality of fingers 521 to 525 arranged in the vertical direction along the central tube groove 63 and a drive unit 53 for moving these fingers 521 to 525 forward and backward with respect to the infusion tube 4 are disposed on the back surfaces of the substrates 51a and 51b. ing. In the present embodiment, a total of five fingers are used, but the one arranged at the uppermost part and the lowermost part crushes the infusion tube 4 so that the inner space of the infusion tube 4 is closed. Here, the uppermost finger is referred to as a first closing finger 521, and the lowermost finger is referred to as a second closing finger 525. Between the two closing fingers 521 and 525, three liquid feeding fingers for pressing the infusion tube 4 so as not to be crushed and causing peristaltic movement are arranged. Here, the three liquid feeding fingers are referred to as the first, second, and third liquid feeding fingers 522 to 524 from the top. These five fingers 521 to 525 are arranged in a rod shape such that the tip end faces the outside from between the substrates 51 a and 51 b and the rear end extends to the back side of the pump body 1. . The number of fingers is not particularly limited. For example, if two or more closing fingers and one or more liquid feeding fingers are provided, a predetermined amount of infusion can be discharged as described later. .

  First, the closing fingers 521 and 525 will be described with reference to FIG. FIG. 4 is a perspective view (a) and a sectional view (b) of the closing finger. Since both closing fingers have the same configuration, only the first closing finger 521 will be described here. As shown in the figure, the closing finger 521 includes a cylindrical main body 541 and a movable member 542 inserted into the main body 541. In the main body 541, a cylindrical recess 543 is formed on the distal end side, and the above-described movable member 542 is inserted into the recess 543. In addition, a pair of elongated holes 544 extending in the axial direction are formed on the outer peripheral surface of the main body portion 541, and these are opposed to each other with the axis X of the main body portion 541 interposed therebetween. Further, a roller 545 is rotatably attached to the rear end portion of the main body 541, and the roller 545 constitutes a cam follower that abuts on a cam of the drive unit 53 described later.

  The movable member 542 includes a cylindrical base portion 546 that is inserted into the concave portion 543 of the main body portion 541, and a pressing portion 547 that is attached to the distal end of the base portion 546 and presses the infusion tube 4. A spring 548 is fitted into the rear end of the base portion 546 and is inserted into the recess 543 of the main body portion 541 in this state. Therefore, the movable member 542 is urged in a direction protruding from the recess 543 by the spring 548. In addition, a through hole 5461 is formed in the side surface of the base portion 546 in the radial direction. When the base portion 546 is inserted into the concave portion 543 of the main body portion 541, the elongated hole 544 and the through hole 5461 of the main body portion 541 The shaft member 549 is fitted. Therefore, the shaft member 549 is retained, and the movable member 542 is prevented from falling off from the main body portion 541 and is movable in the axial direction by the length of the long hole 544.

  The pressing portion 547 is formed in a pentagonal hollow cylindrical shape whose axial center extends in parallel with the central tube groove 63, and a protrusion 5471 is formed at the tip. The protrusion 5471 extends so as to be orthogonal to the central tube groove 63, and the infusion tube 4 is crushed by the protrusion 5471. In the hollow portion, a portion corresponding to the ridge 5471 is provided with a reinforcing plate 5472 for reinforcing the ridge 5471, and is disposed parallel to the ridge 5471 so as to close the hollow portion.

  Next, the liquid feeding finger will be described. Since the three liquid feeding fingers 522 to 524 have the same configuration, only the first liquid feeding finger 522 will be described here. As shown in FIG. 3, the liquid feeding finger 522 includes a rod-like main body portion 551 and a pressing portion 552 provided at the tip of the main body portion 551. Similar to the closing finger, a roller 553 is rotatably attached to the rear end portion of the main body portion 551 to constitute a cam follower. Similar to the pressing portion 547 of the closing finger, the pressing portion 552 is formed in a pentagonal hollow cylindrical shape whose axial center extends in parallel with the central tube groove 63. However, no protrusion is provided, and the orientation is adjusted so that the surface that presses the infusion tube 4 is flat.

  Next, the drive unit 53 that drives these fingers 521 to 525 will be described. As shown in FIG. 3, the drive unit 53 includes a shaft member 531 that is disposed on the back side of the fingers 521 to 525 and extends in parallel with the central tube groove 63. The shaft member 531 is rotatably supported in the pump body 1 and is configured to rotate around the shaft by a motor (not shown). Further, five cams 561 to 565 are fixed to the outer peripheral surface of the shaft member 531, and each cam 561 to 565 is configured to abut on the cam followers 545 and 553 of the five fingers 521 to 525. Has been. These cams 561 to 565 are configured such that the shaft member 531 rotates and the five fingers 521 to 525 are advanced and retracted with respect to the central tube groove 63 side in a set order to repeatedly press the infusion tube. Has been. Thereby, the infusion tube 4 operates so as to perform a peristaltic motion.

  Note that the rotation speed of the shaft member is controlled by a controller (not shown). Moreover, the shapes of the cams 561 to 565 can be changed as appropriate.

<2. Cover body>
Next, the cover body 3 will be described. As shown in FIG. 1, an operation panel is provided on the surface 31 of the cover body 3. Although illustration regarding the details of the operation panel is omitted, a liquid crystal display and various switches are arranged on the operation panel. As the switch, for example, a power switch, a flow rate adjustment switch for adjusting the flow rate of the infusion, a fast-forward switch, a borer switch, and the like are arranged. The fast-forward switch is a switch that feeds liquid by fast-forwarding while pressing it for the purpose of removing bubbles, etc. The bolus switch is a rapid switch that can be set by pressing and holding for the purpose of one-shot injection. The switch to administer. The liquid crystal display also displays, for example, the time, the set flow rate, the integrated amount of infusion.

  Then, the structure of the installation surface 32 which is the back surface of the cover body 3 is demonstrated. A rectangular installation recess 321 is formed in the installation surface 32 of the cover body 3, and a rectangular support plate 33 is disposed in the installation recess 321. And the receiving plate 34 mentioned above is arrange | positioned so that this support plate 33 may be covered.

  FIG. 5 is a perspective view of the support plate. As shown in FIG. 5, screw holes 331 for fixing the support plate 33 to the installation recesses 321 are formed at the four corners of the support plate 33. Further, holding screw portions 332 for holding the receiving plate 34 are respectively attached to the inner sides of the screw holes 331 in the left-right direction, and these screw portions 332 are formed in a cylindrical shape having a female screw. Yes. Three holding holes 333 arranged in the vertical direction are formed at the center in the width direction of the support plate 33, and protrusions 3331 are formed in the holding holes 333, respectively. The first springs 35 are fitted into the protrusions 3331 as will be described later. Further, a protruding plate 334 extending in the vertical direction is provided between the right pair of holding screw portions 332. Further, a guide groove 335 into which a slide member 36 described below is fitted is formed on the right side of the protruding plate 334. The support plate 33 is a separate member from the cover body 3, but may be formed integrally with the installation surface 32 of the cover body 3.

  The slide member 36 is formed in a rectangular parallelepiped shape, and can slide in the left-right direction along the guide groove 335. A pressing plate 361 that protrudes toward the receiving plate 34 is attached to the end of the sliding member 36 on the protruding plate 334 side (left side). The pressing plate 361 presses the right end of the receiving plate 34. It has become. On the other hand, a spring hole 362 into which the second spring 37 is fitted is formed at the right (hinge side) end of the slide member 36. The spring hole 362 extends in the left-right direction, and the second spring 37 is also disposed so as to extend in the left-right direction along the spring hole 362. The end of the second spring 37 is fixed inside the end edge of the installation recess 321, whereby the slide member 36 is urged to the left by the second spring 37, and the receiving plate 34 is also It is urged to the left side.

  Next, as shown in FIG. 2, with respect to the receiving plate 34, the surface of the receiving plate 34, that is, the surface facing the pump body 1 (hereinafter referred to as the surface), 341 is formed. The central protrusion 341 extends in the vertical direction and is fitted into the central tube groove 63 in the gap between the substrates 51 a and 51 b of the pump mechanism 5, and has a flat surface facing the central tube groove 63. ing. That is, the width of the central protrusion 341 is substantially the same as the width of the central tube groove 63. A pair of grooves 342a and 342b into which the side protrusions 511a and 511b provided on the substrates 51a and 51b of the pump mechanism 5 are fitted are formed on both sides of the central protrusion 341. Further, two notches 343 extending in the left-right direction are formed on both sides of the receiving plate 34, and flanges 3431 are formed on the inner wall surface of each notch 343. The notch portions 343 are inserted with the holding screw portions 332 of the support plate 33 described above and screwed through the washers 43. At this time, the washer 43 is disposed so as to cover the flange 3431 of each notch 343, so that the receiving plate 34 is prevented from being detached from the support plate 33 by the washer 43. Each holding screw portion 332 is relatively movable in the left-right direction in the cutout portion 343.

  Next, the surface of the receiving plate 34 that faces the support plate 33 (hereinafter referred to as the back surface) will be described with reference to FIG. FIG. 6 is a perspective view of the receiving plate as seen from the back side. As shown in the figure, three elongated holes 345 into which the first springs 35 fixed to the support plate 33 are fitted are formed on the back surface of the receiving plate 34. Each elongated hole 345 extends in the left-right direction, and the first spring 35 is movable in the left-right direction in each elongated hole 345. That is, each first spring 35 is fitted and fixed to the protrusion 3331 on the support plate 33 side, but is not fixed on the receiving plate 34 side, but only fits into the elongated hole 345. The inside of the hole 345 can be moved in the left-right direction. At this time, a slide member (not shown) having a flat surface can be attached to the end of the first spring 35 so that the first spring 35 can move smoothly in the elongated hole 345. If the flat surface of the slide member is arranged so as to slide in the elongated hole 345, the end of the first spring 35 can smoothly move in the left-right direction in the elongated hole 345.

  A fixing recess 346 extending in the vertical direction is formed on the right side of the elongated hole 345, and a checking recess 347 extending in the vertical direction is formed on the right side of the fixing recess 346. These two concave portions 346 and 347 are arranged in parallel, and both are formed to have a size to fit the protruding plate 334 of the support plate 33.

  With the above-described configuration, the receiving plate 34 is pressed by the first spring 35 in a direction away from the back surface 32 of the cover body 3. However, since the washer 43 engages with the flange 3431 of the notch 343, this prevents the washer 43 from coming off from the support plate 33. Further, since the holding screw portion 332 formed on the support plate 33 is inserted into the four cutout portions 343 of the receiving plate 34, the receiving plate 34 is guided by the holding screw portion 332 and left and right. Can move in the direction.

  In addition, on the installation surface 32 of the cover body 3, a projection 39 for pressing the infusion tube 4 mounted in the upper and lower tube grooves 61 and 62 is provided above and below the receiving plate 34. . Therefore, the infusion tube 4 is pressed not only by the receiving plate 34 but also by such protrusions 39.

<3. Operation of infusion pump>
Next, the usage method and operation | movement of a pump apparatus comprised as mentioned above are demonstrated. 7-9 is sectional drawing which shows a mode that a cover body is normally closed. Hereinafter, the operation until the cover body is closed will be described first, and then the operation of feeding the infusion using the infusion tube will be described.

<3.1 Infusion tube installation and cover body installation>
First, the cover body 3 is opened, and the infusion tube 4 is attached to the tube grooves 61 to 63. At this time, an infusion bag is attached to the upstream side of the infusion tube 4 and a puncture needle is attached to the downstream side.

  When the infusion tube 4 is attached, the cover body 3 is closed from the initial position (first position). When the cover body 3 is closed, as shown in FIG. 7, first, the guide member 12 of the pump body 1 comes into contact with the end portion of the receiving plate 34. In this state, when the cover body 3 is further closed, the inclined surface 121 of the guide member 12 presses the left end of the receiving plate 34, whereby the receiving plate 34 resists the elastic force of the second spring 37. It moves to the hinge 2 side. Then, when the cover body 3 is closed until the end of the receiving plate 34 passes through the inclined surface 121 of the guide member 12, the receiving plate 34 further moves to the hinge 2 side, and as shown in FIG. The protruding plate 334 is disposed at a position facing the fixing recess 346. Further, the central protrusion 341 of the receiving plate 34 is disposed at a position facing the central tube groove 63. In this state, when the cover body 3 is further pushed in to close, the receiving plate 34 is pressed from the substrates 51 a and 51 b of the pump body 1. As a result, the receiving plate 34 is pressed against the support plate 33 against the first spring member. In this way, as shown in FIG. 9, the cover body 3 is completely closed (second position) in a state where the receiving plate 34 is sandwiched between the support plate 33 and the substrates 51a and 51b. At this time, the central protrusion 341 of the receiving plate 34 fits in the central tube groove 63 and firmly fixes the infusion tube. Further, the side protrusions 511a and 511b of the substrates 51a and 51b are fitted into the grooves of the receiving plate 34, respectively.

  The operation of closing the cover body 3 as described above is an operation when the cover body 3 is normally closed. However, the infusion tube 4 is not properly fitted in the central tube groove 63, and even a part of the operation is performed in the center. When it protrudes from the tube groove 63, for example, when it arrange | positions on the side protrusion part 511a, 511b of board | substrate 51a, 51b, it operate | moves as follows.

  FIG. 10 shows an example in which the infusion tube 4 is mistakenly disposed on the side protrusions 511a and 511b of the substrates 51a and 51b when the infusion tube is disposed. In this example, when the cover body 3 is closed, the guide member 12 comes into contact with the end portion of the receiving plate 34 and the end portion of the receiving plate 34 is pressed against the inclined surface 121 of the guide member 12 as in FIG. It moves to the hinge 2 side. In this process, the infusion tube 4 that protrudes from the side protrusions 511a and 511b of the substrates 51a and 51b has a surface of the receiving plate 34 or the central protruding portion 341 before the receiving plate 34 is completely pushed into the hinge 2 side. Abut. When the cover body 3 is further closed in this state, as shown in FIG. 10, before the projecting plate 334 of the support plate 33 is disposed at a position facing the fixing recess 346, the receiving plate 34 is on the support plate 33 side. The protrusion plate 334 of the support plate 33 enters the check recess 347. Thereby, the movement of the receiving plate 34 to the hinge 2 side is restricted, and the receiving plate 34 cannot move further in the left-right direction. As a result, the cover body 3 cannot be closed, and the user can recognize that the infusion tube 4 is not normally disposed in the central tube groove 63.

  In the above description, the protruding plate 334 fits into the check recess 347 so that the receiving plate cannot move. However, when the infusion tube 4 is sandwiched between the receiving plate 34 and the substrates 51a and 51b, The receiving plate 34 cannot move in the left-right direction due to the frictional force with the infusion tube 4. Therefore, if the protruding plate 334 and the check recess 347 are provided, the receiving plate 34 can be reliably prevented from moving, but by that time, the receiving plate 34 has already been unable to move due to friction with the infusion tube 4. .

<3.2 Liquid transfer operation>
Next, the flow rate of the infusion is determined by operating the operation panel. Thereby, the shaft member rotates at a predetermined speed, and each finger moves forward and backward. The operation of each finger can be variously set. For example, the operation can be performed as follows. First, the second closing finger 525 moves forward to crush the infusion tube 4 and close the infusion tube 4. Subsequently, the first closing finger 521, the first, second, and third liquid feeding fingers 522 to 524 are retracted in this order, and the infusion solution is accumulated in the infusion tube 4 above the second closing finger 525. . Subsequently, the first closing finger, the first, second, and third liquid feeding fingers 522 to 524 move forward in this order, so that the infusion tube 4 performs a peristaltic motion, and the lower part of the infusion The flow to is encouraged. Then, after the third liquid feeding finger 524 moves forward, the second closing finger 525 moves backward to release the closing of the infusion tube 4 and open downward. As a result, the infusion directed downward by the peristaltic motion flows out downward of the second closing finger 525. By repeating the above operation, the infusion is delivered at a set flow rate.

<4. Features>
As described above, according to the present embodiment, the closing finger 521 includes the main body portion 541 and the movable member 542 that can reciprocate with respect to the main body portion 541, and the movable member 542 is moved to the main body portion 541 by the spring 548. It is urged in the direction protruding from. Therefore, even when a manufacturing error or the like occurs in the closing finger 521, the manufacturing error can be absorbed by the movable member 542 moving back and forth with respect to the main body portion 541. As a result, it is possible to reliably press the infusion tube 4 so as to close the lumen.

  Further, the infusion tube 4 is sandwiched between the central protrusion 341 and the fingers 521 to 525, but the central protrusion 341 has a flat surface. The surface on the side of the central protrusion 341 is statically supported by a flat surface, while the surface on the side opposite to the fingers 521 to 525 on the opposite side is deformed by pressing. Therefore, the pressing force from the fingers 521 to 525 can be reliably applied to the infusion tube 4. On the other hand, for example, when deformation is received from both sides of the infusion tube 4, the infusion tube 4 may meander, and the pressing force from the fingers 521 to 525 may not be reliably applied. Therefore, in the infusion pump according to the present embodiment, the infusion tube 4 can be reliably pressed by the closing finger 521, and an infusion with an accurate flow rate can be supplied.

<5. Modification>
As mentioned above, although one Embodiment of this invention was described, this invention is not limited to the said embodiment, A various change is possible unless it deviates from the meaning.

  For example, in the said embodiment, although the cam mechanism is used as a drive part which drives the fingers 521-525, it is not limited to this. That is, various configurations are possible as long as the fingers 521 to 525 can be advanced and retracted with respect to the infusion tube 4 in the set order.

  In the above embodiment, the movable member 542 of the closing finger 521 is biased by the spring 548, but may be other than the spring as long as the biasing force acts.

  Further, the closing fingers 521 and 525 are arranged at the uppermost part and the lowermost part, but the arrangement positions of the closing fingers are not limited, and may be arranged at two places via at least one liquid feeding finger.

DESCRIPTION OF SYMBOLS 1 Pump main body 11 Tube mounting surface 2 Hinge 3 Cover body 34 Receiving plate 341 Central protrusion (protrusion part)
521, 525 Closing finger 541 Main body 542 Movable member (movable part)

Claims (2)

An infusion pump for feeding liquid by pressing the outer peripheral surface of the infusion tube,
A pump body having a tube mounting surface in which a tube groove for arranging the infusion tube is formed;
A hinge provided on the pump body;
A cover body that is swingably attached to the pump body via the hinge so as to close a tube attachment surface of the pump body, and has a protrusion that fits into the tube groove;
A plurality of fingers arranged along the tube groove of the pump body and pressed against the infusion tube attached to the tube groove while moving forward and backward,
A drive unit for moving the plurality of fingers forward and backward;
With
The plurality of fingers are
A plurality of closing fingers that crush the infusion tube and close the lumen of the infusion tube;
And at least one liquid feeding finger that pushes the lumen of the infusion tube so as not to close the lumen,
Each closing finger includes a main body portion extending in one direction, and a movable portion attached to the main body portion and capable of reciprocating in the one direction to press the infusion tube,
The said movable part is an infusion pump urged | biased in the direction which protrudes from the said main-body part.   The infusion pump according to claim 1, wherein the protrusion has a flat surface that comes into contact with the infusion tube.