JPH0531188A - Medical liquid pump - Google Patents

Abstract

PURPOSE:To enable the grasping of a tube accurately by composing a pressing means of a pressing member which abuts on the tube while being long in the direction of the tube and deformable elastically to prevent increase in a grasping force with the finger and a holder under the influence of a liquid. CONSTITUTION:A holder 52 is formed integrally by performing an insert molding of a slender pressing member 92 deformable elastically made of rubber or a synthetic resin and a slender support member 94 as rigid as an insert metal. Here, the support member 94 allows the keeping member 92 to deform elastically across the width thereof but prevents the keeping member 92 from deforming being bent and from deforming elastically along the length thereof. This enables the prevention of excessive increase in the grasping force with a finger and a holder under the influence by a liquid leaked, and a difference in moving value between the fingers, if any, as caused by machining errors or the like can be absorbed by the elastic deformation of the pressing member thereby allowing the grasping of a tube accurately.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a medical liquid pump used for administering a medical liquid to a human body, and more particularly to a medical liquid pump for peristaltic movement of a plurality of fingers.

[0002]

2. Description of the Related Art As one of medical liquid pumps, a tube for transporting a liquid medicine is held between a plurality of fingers and a presser,
There is one that sends a liquid medicine by moving a finger peristally with respect to the presser foot.

In this type of pump, the fingers are generally supported by a supporting means, that is, the main body, and the presser foot is attached to a door which is openably and closably attached to the main body. The presser foot includes a presser plate and a spring arranged between the presser plate and the door. The spring is made of metal such as a leaf spring or a coil spring, and presses the holding plate toward the tube. However, with a pump using such a presser,
Liquid that has leaked onto the body, liquid that has traveled on the outer surface of the tube, etc., enters between the retainer plate and the door, resulting in a dirty pump. Further, the elasticity of the spring is increased by the liquid adhering to the spring, and as a result, the holding force by the fingers and the presser becomes too large.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to prevent the gripping force of fingers and a presser from being excessively increased by a liquid so that the tube can be securely gripped.

[0005]

A liquid pump for medical use according to the present invention comprises a holding means for a tube for liquid, and a plurality of fingers movable in the same direction to hold the tube in cooperation with the holding means. And a drive means for peristalticizing the finger with respect to the pressing means to deform the tube, the pressing means being in contact with the tube and being elastically deformable in the direction of the tube. It is characterized by comprising a member.

In use, the finger is driven by the driving means while the tube is held between the finger and the presser foot. As a result, the finger makes a peristaltic movement with respect to the holding means and sends the liquid in the tube. When the pump is running, the tube is always held by at least one finger and the presser foot. According to the present invention, since the pressing member itself that contacts the tube can be elastically deformed, it is not necessary to use a metal spring, and it is possible to prevent the holding force due to the finger and the pressing from becoming too large due to the leaked liquid. The presser foot can be washed.
Further, even if there is a slight difference in the amount of movement between the fingers due to a processing error or the like, this difference is absorbed by the elastic deformation of the pressing member, so that the tube can be held more reliably.

[0007] It is preferable that the pressing member further includes a supporting member that is a supporting member that prevents the pressing member from bending and that is a rigid supporting member that is connected to the pressing member. Thereby, the bending of the pressing member is prevented, and the holding force becomes uniform in the longitudinal direction of the pressing member. In this case, if the pressing member and the supporting member are manufactured by integral molding,
The number of presser parts is reduced, which facilitates pump assembly and maintenance.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Referring to FIGS. 1-4, a pump 10 includes a box-shaped housing 12. The housing 12 is used so that its opening faces the front, and the pump 1
It has a handle 14 to be used when carrying 0.

A box-shaped door 16 is openably and closably connected to the housing 12 by a hinge 18 or the like. When the door 16 is closed, the opening of the door 16 overlaps the opening of the housing 12. The door 16 can be opened and closed with respect to the housing 12 by using a knob (not shown), and is maintained releasably in a closed state by a stopper mechanism (not shown). The opening of the housing 12 is a panel 20.
It has been closed by. Panel 20 made of synthetic resin
May be integrally formed with the housing 12. The tube 22 is designed so that the fluid flows from the upper side to the lower side, that is, the upstream side is the upper side and the downstream side is the lower side.
It is attached to the panel 20.

A pump unit 30 for feeding the liquid in the tube 22 is detachably attached to the panel 20 by a plurality of screws 24. As shown in FIGS.
The pump unit 30 includes an actuating mechanism 32 and a holding mechanism 34 for holding the tubes 22 in cooperation with each other and sending the liquid in the tubes 22, as well as the mechanisms 32, 34.
A holder 36 for accommodating and holding

As shown in FIGS. 4-8, the holder 36 is
The first holder portion supports the actuating mechanism 32 and the second holder portion supports the holding mechanism 34, and a part of the holding mechanism 34 is fitted into the recess 26 formed in the front surface of the panel 20. The holder 36 is integrally molded of resin. The first and second holder portions are separated from each other, and the space 38 between the both holder portions is used as a space for putting the tube 22 in and out between the actuating mechanism 32 and the holding mechanism 34.

As shown in FIGS. 5-8, the actuation mechanism 32
Is a plurality of fingers 4 accommodated in parallel in the holder 36.
Equipped with 0. Each finger 40 is arranged so as to be slidable in a direction toward and away from the pressing mechanism 34 (in the illustrated example, a direction parallel to the mounting surface of the panel 20), and a pin 42 mounted on the holder 36 holds the finger 40. It is prevented from leaving 36. The pin 42 is passed through an elongated hole 44 formed in the finger 40.

The holding mechanism 34 has a U-shaped arm 46 pivotally connected to the holder 36, a lever 48 pivotally connected to the arm 36, and a holder 48 pivotally connected to the lever 36. A U-shaped bracket 50 disposed so as to be displaceable in the direction of the finger 40, an elongated retainer 52 attached to the bracket by a plurality of screws, and a lever 4
8 and a stopper 54 formed integrally. Figure 5
When the lever 48 is pushed in parallel to the flat plate portion on the front surface of the holder 36 (in the illustrated example, parallel to the mounting surface of the panel 20), the lever mechanism connecting the arm 46, the lever 48, and the bracket 50 as shown in FIG. Is stretched,
The presser foot 52 is advanced to a position where the tube 22 is pressed against the finger 40. On the other hand, as shown in FIG. 8, when the lever 48 is pulled up, the lever mechanism is contracted, so that the presser 52 is retracted to the position where the pressing of the tube 22 against the finger 40 is released. Therefore, the pressing mechanism 52 can be selectively displaced by the lever mechanism between a position where the tube 22 is pressed against the finger 40 and a position where the pressing of the tube 22 against the finger 40 is released.

As shown in FIG. 5, the lever 48 is attached to the holder 3
When pushed in parallel with the flat plate portion in front of 6, the connection point between the arm 46 and the lever 48 is a line connecting the pivot point of the arm 46 to the holder 36 and the connection point between the lever 38 and the bracket 50. Further, it is displaced to a position opposite to the flat plate portion. As a result, the lever mechanism is prevented from contracting, and the presser 52 is maintained at a position to press the tube 22 against the finger 40. On the other hand, as shown in FIG. 8, when the lever 48 is raised, the arm 46 and the lever 4 are
The connection point with 8 is displaced toward the flat plate side from the line connecting the pivot point of the arm 46 to the holder 36 and the connection point between the lever 38 and the bracket 50. As a result, the lever mechanism is contracted, and the presser 52 is displaced to a position where the pressing of the tube 22 on the finger 40 is released.

The stopper 54 includes a lever 48 and a holder 36.
By being pushed in parallel with the flat plate portion of the above, the lever 46 releasably engages, whereby the lever 48 is moved to the position shown in FIG.
Prevent it from being naturally induced as shown in. The engagement of the stopper 54 with the arm 46 is released by pulling up the lever 48.

In the pump unit 30 described above, the panel 20 is provided at the flange portion 36a of the holder 36 so that the moving direction of the finger 40 is parallel to the mounting surface of the panel 20.
Detachably attached to. Therefore, the holder 36
Is removed from the panel 20, and the operating mechanism 32 and the pressing mechanism 3
4 and the holder 36 can be washed. pump·
According to the unit 30, the degree of matching between the actuating mechanism 32 and the pressing mechanism 34 depends on the degree of matching between the actuating mechanism 32 and the pressing mechanism 34 with respect to the holder 36. It is not affected, and therefore the design, machining, assembly and maintenance of each mechanism including the actuating mechanism 32 and the pressing mechanism 34, each member, etc. are facilitated. However, the actuating mechanism 32 and the pressing mechanism 34 do not have to be unitized. In this case, the pressing mechanism 34 may be attached to the door 16 side.

As shown in FIGS. 5 and 6, the fingers 4 are
The drive mechanism 60 that causes 0 to perform a peristaltic movement with respect to the pressing mechanism 34 includes a rotation source 62 that uses a motor, a cam mechanism 64 that is rotationally driven by the rotation source, and the finger 40 that moves the movement of the cam mechanism.
And a transmission mechanism 66 for transmitting to the panel 20.
Is supported by a bracket 68 attached to the.

In the cam mechanism 64, a plurality of cams 70 individually associated with the fingers 40 are attached to a cam shaft 72 rotatably supported by a bracket 68 at the same pitch as the arrangement pitch of the fingers 40. Each cam 70 is a circular eccentric cam. Such a cam mechanism 64 is publicly known as described in, for example, Japanese Patent Publication No. 14432/1989, and therefore its detailed description will be omitted. Rotation source 62
The rotation of is transmitted to the cam mechanism 64 by a timing pulley 74 attached to the output shaft of the rotation source 62, a timing pulley 76 attached to the cam shaft 72, and a timing belt 78 hung on both pulleys.

The transmission mechanism 66 includes a finger 40 and a cam 7.
A plurality of push plates 80 individually corresponding to 0 are provided, and the push plates 80 are attached to the pins 82 fixed to the bracket 68 so as to be pivotally movable at the same pitch as the arrangement pitch of the fingers 40. Each push plate 80 has a corresponding cam 70.
Has holes 84 arranged therein and engaging portions 86 for engaging the corresponding fingers 40. The engaging portion 86 projects forward of the panel 20 through the hole 88 of the panel 20 and engages with the corresponding finger 40 in the recess 90 formed therein. The transmission mechanism 66 reciprocates the corresponding finger 40 at each engaging portion 86 by pivotally moving (oscillating) around the pin 82 as each push plate 80 rotates with the corresponding cam 70. . As a result, the finger 40 makes a peristaltic movement with respect to the pressing mechanism 32.

The tube 22 is held by at least one finger 40 and the presser 52 while the presser 52 is displaced to a position for pressing the tube 22 against the finger 40. Therefore, even if the door is opened, the tube 2
The liquid in 2 will not be injected into the human body by spontaneous fall. Therefore, the stopper that stops the flow of the liquid in the tube and the drive mechanism that drives the stopper when the door is opened are not required. Therefore, these may or may not be provided. In addition, the door may or may not be provided.

In the example shown in FIGS. 1 and 4, the pump unit 30 is such that the actuating mechanism 32 is on the upper side and the presser mechanism 34 is on the lower side with respect to the portion of the tube 22 passing between the actuating mechanism 32 and the pressing mechanism 34. And the portion of the tube 22 passing between the actuating mechanism 32 and the pressing mechanism 34 is arranged so as to be inclined with respect to the horizontal line. Therefore, the liquid transmitted on the outer surface of the tube 22 is transmitted to the lower portion of the tube, that is, the portion on the side of the pressing mechanism 34 by gravity, at least between the actuating mechanism and the pressing mechanism, and the fingers contact the upper side of the tube 22. Contact. Therefore,
Compared with the conventional pump, the liquid transmitted from the tube 22 to the finger is significantly reduced, and the chance that the operating mechanism 32, particularly the finger, is contaminated by the liquid transmitted through the tube 22 is significantly reduced.

Instead of tilting the tube 22 between the actuation mechanism 32 and the hold down mechanism 34, the pump unit 30 is panel mounted so that the tube 22 is mounted horizontally between the actuation mechanism 32 and the hold down mechanism 34. You may assemble to 20. Further, the operating mechanism 32 may be arranged below the pressing mechanism 34, or the operating mechanism 32 and the pressing mechanism 34 may be arranged so that the tube 22 is passed between the operating mechanism 32 and the pressing mechanism 34 in the vertical direction. Good.

The actuating mechanism 32 and the drive mechanism 60 are shown in FIG.
As shown in, the structure may be such that the movement of the cam mechanism 64 is directly transmitted to the finger 40.

As shown in FIGS. 10 to 12, the presser 52
Is an elastically deformable elongated pressing member 92 made of rubber or synthetic resin, and an elongated supporting member 94 having rigidity such as an insert fitting, which are integrally formed by insert molding or the like. It has the shape of a prism. Both ends of the pressing member 92 in the thickness direction protrude from the support member 94, and the pressing member 92 has a pressing surface 52a at one end in the thickness direction. The support member 94 is the pressing member 92.
Is allowed to elastically deform in its thickness direction, but prevents the pressing member 92 from bending and deforming and the pressing member 92 to elastically deform in its longitudinal direction. The presser foot 52 is a screw 98 screwed into a screw hole 96 formed in the support member 94.
Thus, the pressing surface 52a is attached to the bracket 50 so that the pressing surface 52a is on the finger side.

By using the presser 52 as described above, since it is not necessary to use a metal spring, it is possible to effectively prevent the spring force of the presser member 92 from increasing due to the leaked liquid, and it is possible to prevent presser. Can be washed. Also,
Even if there is a slight difference in the amount of movement between the fingers due to a processing error or the like, this difference is absorbed by the elastic deformation of the pressing member, so that the tube can be held more reliably. Furthermore, since the bending of the pressing member is prevented by the supporting member, the holding force becomes uniform in the longitudinal direction of the pressing member.

As the presser 52, for example, an elastically deformable member made of rubber, synthetic resin, or the like, an elastically deformable pressing member having a pressing surface arranged on a rigid plate, or the like is used.
It may have another structure. However, if the pressing member and the supporting member are manufactured by integral molding, the number of parts becomes one, and the assembly and maintenance of the pump become easy.

Referring again to FIGS. 1-4, panel 20
Two clamps 100 and 102 for holding the tube 22 are formed on the mounting surface of the. The clamp 100 is
It has a pair of clamp members 104 and 106 which are formed on the upper side of the panel 20 and are vertically separated to hold the tube 22 substantially horizontally. On the other hand, the clamp 102 is formed on the lower portion of the panel 20 and has a pair of clamp members 108 and 110 which are horizontally separated to hold the tube 22 substantially vertically.

As shown in FIG. 4, the tube 22 includes a clamp 100, a pump unit 30, and a bubble sensor 11.
2, the pressure sensor 114, and the clamp 102. The tube 22 is bent on the upstream side of the clamp 100, and then is held substantially horizontally by the clamp 100. As a result, the liquid flowing down along the outer surface of the tube 22 can be dropped as droplets from the lowermost end of the curved portion of the tube.

When the tube 22 is clamped substantially vertically from the vertical direction by the clamp members 104 and 106, the liquid transmitted on the outer surface of the tube 22 gathers on the lower surface of the tube 22 by its own weight until it reaches the position where the clamp 100 is arranged. . Therefore, the liquid reaching the clamp 100 is
The clamp member 104 arranged on the lower side is brought into contact with the clamp member 104, the tube 22 moves to the clamp member 104 by its own weight, and the clamp member 104 removes the clamp member 104. As a result, it is possible to effectively prevent the liquid transmitted through the tube 22 from flowing into the space in which the fingers 40 are arranged, that is, the space formed by the door 16 and the panel 20.

As shown in FIG. 13, the upper surface of the clamp member 104 and the lower surface of the clamp member 106 of the clamp 100 gradually decrease from the upstream end toward the central convex portion 116, respectively, Tube 2 on the downstream side
Jointly define a void that is larger than the diameter of 2.

As shown in FIG. 13, the clamp member 104
Of the upper surface of the, the surface portion 118 on the upstream side from the convex portion 116
Is an inclined surface that gradually decreases from the portion of the convex portion 116 toward the upstream end, while the clamp member 106
The corresponding surface portion 120 of is substantially horizontal. Further, the distance between the convex portion 116 and the surface portion 120 is slightly smaller than the outer diameter of the tube 22. Therefore, the tube 22 is slightly crushed between the clamp members 104 and 106. As a result, the lower surface of the tube 22 is deformed into an inclined portion that extends obliquely upward from the upstream side to the downstream side on the upstream side of the convex portion 116, so that the liquid attached to the lower surface of the tube 22 is The convex portion 116 and the surface portion 1 due to its own weight
18 and is reliably removed from tube 22.

In the illustrated example, the upper surface of the clamp member 104 is a gable roof-shaped surface having the highest central portion in the direction along the tube 22, but the central portion may have the highest arc surface or a convex shape. The surface on the downstream side of the portion 116 may be removed. Also, instead of forming the face portion 118,
A convex portion having a circular or polygonal cross section may be formed at the portion of the convex portion 116.

As shown in FIGS. 1, 2 and 4, the panel 20 also receives the liquid flowing from the gap between the housing 12 and the door 16 into the space formed by the door 16 and the panel 20. A gutter 122 is formed. Gutter 1
22 is inclined so as to guide the received liquid to the side of the housing 12. As a result, the actuating mechanism 32, particularly the finger 40, can be protected from the liquid flowing into the space through the gap. The gutter 122 may be formed in the door 16. Further, the gutter 122 is a surface inclined only from one end to the other end thereof, but may be a gable roof-shaped surface having the highest central portion or an arc surface having the highest central portion.

As shown in FIG. 3, a support plate 124 connected to the panel 20 is arranged in the housing 12. A circuit board 126 for an electric circuit is provided on the support plate 124.
Is attached. Electrical components 128 such as a connector and a main switch, and electrical components 130 such as a buzzer and a speaker are attached to the support wall 132. The support wall 132 is pressed against the rear wall 134 of the housing 12 by the bracket 68 of the drive mechanism 60 and the support plate 124, and the opening 13 formed in the rear wall 134.
It acts as a partition wall that closes 6. The support wall 132 is
A plurality of openings 138 corresponding to the electric components 128 and 130
Have.

Of the support wall 132, the electrical components 128, 1
The part to which 30 is attached is the inner surface 140 of that part.
Are arranged so as to be obliquely upward and the outer side surface 142 is obliquely downward. This causes the liquid to
Even if the liquid adheres to the outer surface 14, the liquid is directed obliquely downward to the outer surface 14
Since it flows along the flow path 2, the liquid is less likely to enter the housing 12 through the opening 138 as compared with the case where the outer surface 142 is the vertical surface. Further, when the surface defining the lower end of the opening 138 is an inclined surface that is obliquely upward from the outside to the inside of the housing, compared to the case where the corresponding surface is a horizontal surface,
It is more difficult for the liquid flowing on the outer side surface 142 to enter the housing 12. The electric components 128 and 130 are arranged so as to face the corresponding openings 138, and the surfaces facing the openings 138 are arranged obliquely downward on the inner side surface 140 that is obliquely upward. As a result, even if the liquid that has propagated through the outer side surface 142 accumulates in the openings 138 as droplets, the droplets are prevented from entering the electric components 128 and 130.

The housing 12 has an eaves-like protrusion 144 continuously extending above the outer side surface 142 along the outer side surface and protruding outward. This allows the housing 1
Liquid spilled onto the housing 2 is received by the protrusion 144 and prevented from falling directly onto the outer surface 142, so that the electrical components 128, 130 are effectively protected from the liquid spilled onto the housing 12. To be done. It is preferable that the protruding portion 144 has a gable roof shape or an arc shape with the highest central portion in the longitudinal direction (direction perpendicular to the paper surface in FIG. 3). With this configuration, the liquid that has leaked onto the housing 12 can be reliably guided laterally on the upper surface of the protrusion 144.

As shown in FIG. 14, the projecting portion 144 also has an inward step 146 on the lower surface of the tip portion thereof which extends continuously along the tip portion. Thereby, the step portion 14
6 and the tension of the liquid cause the step portion 146 to act as a gutter, so that the liquid that has leaked onto the housing 12 will not reach the step portion 146.
Can be reliably prevented from flowing directly to the outer side surface 142 of the liquid that has leaked onto the housing 12 as a result of flowing to the end of the protruding portion 144 (the direction perpendicular to the paper surface in FIG. 3). It is preferable that the upper surface of the projecting portion 144 be a surface that gradually inclines from one end to the other end, a gable roof surface with the highest central portion, or an arc surface with the highest central portion.

The housing 12 has a pair of left and right side wall portions 148 that continuously extend in the vertical direction on the left and right sides of the outer side surface 142 and project outward. Each sidewall 148 continues at its upper end to a protrusion 144. As a result, the liquid that has flowed to the end of the projecting portion through the stepped portion 146 flows along the side wall portion 148, and as a result, it is possible to reliably prevent the liquid that has leaked onto the housing 12 from directly falling onto the outer surface 142. it can.

The protrusion 144 and the side wall 148 may be provided on the support wall 132. Further, instead of providing the support wall 132, the rear wall 13 of the housing 12 may be used as the support wall 132.

In the illustrated example, the housing 12, the panel 20 and the support plate 124 constitute a main body for supporting various mechanisms and parts, that is, support means.

The present invention can be applied not only to a pump that moves a finger in a direction parallel to the panel, but also to a known pump that moves a finger in a direction orthogonal to the panel.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a pump of the present invention with a door opened.

2 is a perspective view of the pump of FIG. 1 with the door open and the pump unit removed.

3 is a front view of the pump of FIG. 1 with a portion of the housing cut away to show the structure of the rear wall of the housing.

FIG. 4 is a front view of the panel showing a state in which a pump unit is mounted.

FIG. 5 is a sectional view showing an embodiment of a pump unit and a drive mechanism.

6 is a cross-sectional view taken along the line 6-6 in FIG.

FIG. 7 is a sectional view taken along line 7-7 in FIG.

FIG. 8 is a cross-sectional view of the pump unit for explaining the operation of the lever mechanism of the pump unit.

FIG. 9 is a cross-sectional view showing an embodiment of another pump unit and drive mechanism.

FIG. 10 is a diagram showing an example of a presser foot.

11 is a cross-sectional view taken along line 11-11 in FIG.

12 is a cross-sectional view taken along line 12-12 in FIG.

13 is an enlarged cross-sectional view of a portion A in FIG.

14 is an enlarged cross-sectional view of a B portion in FIG.

[Explanation of symbols]

10 pumps 30 pump units 32 actuation mechanism 34 Presser mechanism 40 fingers 52 Presser foot 60 drive mechanism 92 Presser member 94 Support member

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Kazuo Matsubara             Atom, 3-18-15 Hongo, Bunkyo-ku, Tokyo             Within the corporation

Claims (3)

[Claims] 1. Holding means for a tube for liquid,
An actuating means comprising a plurality of fingers movable in the same direction to hold the tube in cooperation with the holding means, and a driving means for peristalticizing the fingers with respect to the holding means to deform the tube, The medical fluid pump according to claim 1, wherein the retainer includes an elastically deformable retainer member that is in contact with the tube and is long in the direction of the tube. 2. The pump according to claim 1, wherein the presser foot further comprises a support member that is a support member that prevents the press member from bending, and is a rigid support member that is coupled to the press member. 3. The pump according to claim 2, wherein the pressing member and the support member are integrally formed.