JPH0730945Y2 - Infusion pump - Google Patents

Description

TECHNICAL FIELD The present invention pumps an infusion solution by pressing an infusion tube tube in which an elastic tube is spirally wound around a pressing tube with a pressing roller that rotates around the tube tube. Regarding infusion pump.

2. Description of the Related Art Infusion pumps that use elastic tubes, unlike reciprocating pumps, do not allow the fluid to be transferred to be clamped and slid on mechanical sliding surfaces. Since it has features such as no destruction, it is used for infusion of colloids, high molecular weight solutes, blood, etc.
It is also widely used in the medical field such as artificial dialysis. Particularly, in recent years, as medical technology has advanced and automation of medical work has progressed, efficiency in infusion is also desired to be improved. Conventionally, for infusion, a doctor artificially infuses the patient with an infusion set consisting of an infusion bottle drip, a clamp, and the like, but in order to improve the efficiency of this infusion, it is desirable to use an automatic infusion device. The applicant has previously proposed an elastic tube pump that can be carried by the patient as this means. This infusion pump, which is an elastic tube pump, is an improved version of the pressing method that presses the elastic tube communicating with the liquid supply source. Conventionally, the pressing roller shaft is arranged in a direction orthogonal to the elastic tube. On the other hand, paying attention to the fact that by arranging them diagonally, it is possible to increase the pressing area, increase the sealing effect, and reduce the compressive stress that acts on the elastic tube when the discharge pressure is constant. In order to increase fatigue strength, a new removable tube cylinder is formed by spirally winding an elastic tube around a cylindrical body, and the tube and the tube cylinder are inserted between a plurality of pressing rollers that press the outer peripheral surface of the tube cylinder. It is a small-sized and portable infusion pump by a driving means that wears and presses the pressing roller as a planet.

However, in the above-mentioned conventional technique, the tube cylinder is inserted into the shaft center of the pressing rollers arranged on a plurality of concentric circles for pressing and infusing the outer circumference of the tube cylinder by planetary drive, so that the tube cylinder is pressed against the pressing roller. In order to insert into the group axis, at least one pressure roller must be removed, the tube cylinder must be inserted, and after the insertion, the pressure roller must be restored again. Since it is a method of removing it, there is a problem that it takes time and effort to reattach it, and it causes unsanitary conditions such as being dropped carelessly on the floor. In addition, the tube cylinder is fixed by inserting one end into the fixing pin, and it is inserted between the pressing rollers and pressed, so even if there is some misalignment, the pressing torque becomes excessive and smooth rotation can be obtained. There wasn't.

Means for Solving Problems The present invention has been made to solve the above problems, and the gist thereof is a play rotating at a constant speed in the same direction through a driving means at a constant speed. A passive gear that meshes with a gear, a roller shaft holding ring that is fixed to the passive gear and rotates coaxially, a fixed ring that supports and rotates in parallel with the roller shaft holding ring, and the roller shaft holding ring and the fixed ring. And a pressure roller of equal size which is rotatably supported around at least three fixed shafts whose both ends are concentrically fixed to each other, and a liquid supply source which is pressed and sandwiched in parallel between the pressure rollers. An elastic tube is formed of a tube cylinder wound around the outer circumference of the pressing cylinder, and a transfusing means for infusing the outer circumference of the tube cylinder with a pressing roller for planetary movement and pressing, a passive gear, a roller shaft holding ring, and a fixing ring. Insertion groove bored in the same phase radial direction that can be inserted tube tube,
A roller shaft of the two pressing rollers sandwiching the insertion groove is bored with a play groove that is movable in the radial direction, the tube cylinder is press-inserted between the two pressing rollers, and after insertion, a spring force is applied by the pressing rollers. An infusion pump that can be pressed, and an object thereof is to allow anyone to easily interpose a tube cylinder in the infusion pump.

Example FIG. 1 is a diagram showing a schematic structure of an infusion pump of the present invention.
(A) is a plan view, (B) is a cross-sectional view taken along the line XX in FIG. (A), and FIGS. 2 and 3 are detailed explanatory views of main parts in FIG. In the figure, 1 is a base, 2 is a support plate for fixing a main part to the base 1, and 3 is a mounting plate for mounting the motor 4 on the base 1. 5 is driven gears inserted with screws 5a fastened to the motor 4, 6 _1, 6 ₂ predetermined distance in the same idler (idler gear) for transmitting the rotation of the drive gear 5 to the drive gear 5 meshed with the passive gear 7 And rotate in the same direction. 6a and 6b are fixed shafts and bearings for fitting the idlers 6 ₁ and 6 ₂ to the support plate 2. The passive gear 7 is rotatably supported by a bearing 2a fitted to the support plate 2 and has a through hole 7a formed therein. Reference numeral 8 denotes an annular ring having an outer diameter substantially equal to that of the passive gear 7, and a roller shaft holding ring fixed coaxially to the passive gear 7. 10 ₁ , 10 ₂ and 10 ₃ are pressure rollers of equal size and size,
Each roller shaft 10a is rotatably supported by a bearing 10b. Each of the roller shafts 10a is arranged in a concentric circle with one end on the roller shaft retaining ring 8 with a collar 10c interposed and a pressing roller 10 ₃ on the lower side and 10 ₁ and 10 ₂ on the upper target position.
Among them, only the roller shaft 10a of the pressing roller 10 ₃ is fitted, but the pressing rollers 10 ₁ and 10 ₂ are inserted in the play groove 8a which is bored from the equally arranged roller shaft position toward the outer circumference in the radial direction. It is movably inserted. Reference numeral 9 denotes a ring-shaped fixing ring for arranging the roller shafts 10a of the pressure rollers 10 ₁ , 10 ₂ and 10 ₃ in parallel with the roller shaft holding ring 8 in parallel with the roller shaft 10a. Similar to the roller shaft holding ring 8, the pressing roller 10 ₃ is fitted and the pressing rollers 10 ₁ and 10 ₂ are movably inserted in the play groove 8 a. Between the roller shaft holding ring 8 and the fixed ring 9, as shown in FIGS. 2 and 3, spring support rods 11 and 11 are provided for horizontal position axes, and the roller shafts of the respective spring support rods 11 and 11 are arranged. Support rods 12 and 12 are fitted at opposite positions with respect to 10a, and pressing rollers 10 ₁ and 10 ₂ are fitted to the support rods 12 and 12, respectively.
One end of the pressing rollers 10 ₁ and 10 2 is pressed so that the roller shaft 10a of the pressing rollers 10 ₁ and 10 ₂ is always pressed toward the axis, and the other ends of the springs 13 and 13 wound around the spring supporting rods 11 and 11 are supported. It is a thing. Reference numeral 20 denotes a tube cylinder around which an elastic tube 21 for pressure-feeding an infusion solution is wound, and a spiral groove 22a for spirally winding the elastic tube is bored and pressed against the pressing rollers 10 ₁ , 10 ₂ and 10 ₃ . It is composed of a partial pressing cylinder 22 and side cylinders 22b that are integrally formed with the pressing cylinder on both sides of the pressing cylinder 22 and introduce the elastic tube 21 from the axial center. Therefore, the elastic tube 21 passes through the axial center from the one side cylinder end surface on the inflow side, penetrates outside the cylinder in the pressing cylinder 22 and is wound around the spiral groove 22a, and again enters the axial center of the other side cylinder 22a and the end surface. To the outflow side.

In the present invention, the above-mentioned tube cylinder 20 is pressed and inserted from the direction perpendicular to the paper surface as shown in FIG.
Next, description will be given with reference to the drawings. In order to insert the tube cylinder 20 from the upper side, the elastic tube 21, the pressing cylinder 22 and the side cylinder 22b, which are the respective elements of the tube cylinder 20, are connected to the shafts of the pressure rollers 10 ₁ , 10 ₂ and 10 ₃ from the above-mentioned infusion pump upper part. Must be inserted in the mind. First, the elastic tube 21 is formed in the support plate 2 and the passive gear 7 in the same phase toward the axis.
Through the insertion groove of d which is slightly wider than the outer diameter of. The side cylinder 22b passes through an insertion groove D which is slightly wider than the outer diameter of the side cylinder 22a passing through the center between the pressing rollers 10 ₁ and 10 ₂ which are bored in the roller shaft holding ring 8 and the fixed ring 9 toward the axis. Largest pressure cylinder
When 22 is pressed from the arrow M as shown in FIG. 2 (A), the pressing rollers 10 ₁ and 10 ₂ receive a component force in the radial direction and move in the play groove 8a in the arrow R direction into the spring 13 of the spring 13. Extend to the outside against the force. The spring force is exerted by the force P with the spring support rod 11 and the support rod 12 as the fulcrum with the roller shaft 10a always directed toward the axis O, so that the tube cylinder 2a is inserted and attached at the use position in FIG. 2B. ,
After the insertion, the pressing force P is always acting on the tube cylinder 20. When the motor 4 is driven and rotated in the state shown in FIG. 2B, the pressing rollers 10 ₁ , 10 ₂ and 10 ₃ rotate around the tube cylinder 20 as a planet due to the rotation of the roller holding ring 8 which rotates coaxially with the passive gear 7. Due to this planetary rotation, the elastic tube 21 spirally wound around the pressing cylinder 22 is pressed at at least two locations, and the pressing locations are moved in the infusion direction, so that the infusion is pumped upward. The collar portion 22c locks the axial movement of the tube cylinder 20 by the rotational friction component of the tube cylinder 20 to the base 1. Since the tube barrel insertion groove d is bored in the passive gear 7, the passive gear 7 cannot directly mesh with the drive gear 5 and is driven through the idlers 6 ₁ and 6 ₂ .
The idler 6 _1, 6 ₂ of the fixed shaft 6a, the distance L 6a is either idler is always determined in relation to the insertion groove d to the passive gear 5 meshes. Incidentally, when the tube cylinder 20 is inserted, the above-mentioned insertion grooves d and D and the pressing rollers 10 ₁ and 10 ₂ must always be positioned at the upper part, but in the present invention, the power source of the rotating motor 4 is used. without stopping immediately the motor 4 is also turned OFF, stored in the flip-flop circuit (not shown) OFF signal OFF signal through a single multi-circuit, the magnet 30 to the pressing roller ₁₀₃ near the storage signal and a fixed ring 9 The magnetic sensor 40 is fixed to the magnetic sensor 40 at a position facing the magnetic sensor 40 of the base 1.
Is used as the input of each AND circuit (not shown),
The power of the motor 4 is turned off by the output of the AND circuit so that the insertion grooves d and D are always in the upper position.

Effect As is clear from the above description, according to the infusion pump of the present invention, it is possible to insert the tube cylinder between the pressing rollers by simply pressing the tube cylinder from above, so that no special skill is required and anyone can do it. Easy to operate. Moreover, since the drive source is stopped so that the insertion groove of the main element into which the tube cylinder is inserted is always positioned above, the liquid can be rapidly infused, so that a lightweight infusion pump suitable for being carried by a patient or the like can be provided.

[Brief description of drawings]

FIG. 1 shows the structure of the infusion pump of the present invention.
(A) is a plan view, (B) is a cross-sectional view taken along the line X-X in (A), and FIGS. 2 and 3 are principal part explanatory views. 1 ... Base, 2 ... Support plate, 4 ... Motor, 5 ... Drive gear,
6 ₁ , 6 ₂ ... Idler, 7 ... Passive gear, 8 ... Roller shaft holding ring, 9 ... Fixed ring, 10 ₁ , 10 ₂ , 10 ₃ ... Pressing roller, 11
… Spring support rod, 13… Spring, 20… Tube cylinder.

Claims (2)

[Scope of utility model registration request] 1. A passive gear that meshes with an idle gear that rotates at a constant speed in the same direction at a constant speed via a driving means, a roller shaft holding ring fixed to the passive gear and rotating coaxially, and the roller shaft. A fixed ring which is supported and rotated coaxially in parallel with the holding ring, and isometrically rotatably supported around at least three fixed shafts whose both ends are concentrically fixed to the roller shaft holding ring and the fixed ring. Pressure roller,
An infusion liquid consisting of a tube cylinder in which an elastic tube communicating with a liquid supply source that is axially pinched between the pressing rollers and communicating with a liquid supply source is wound around the outer circumference of the pressing cylinder, and is infused by a pressing roller that planetarily moves and presses the outer circumference of the tube cylinder Means, an insertion groove into which the tube cylinder can be inserted in the passive gear, the roller shaft holding ring, and the fixing ring and are bored in the same phase in the radial direction, and the roller shafts of the two pressing rollers sandwiching the insertion groove in the radial direction. An infusion solution characterized in that a movable play groove is bored, the tube cylinder is pressed and inserted between two pressing rollers, and after the insertion, spring means is provided which can be pressed by a spring force by the pressing rollers. pump· 2. A storage means for storing a stop signal for stopping the drive means, and a detection means for detecting a position at which the insertion groove of the fixing ring makes a tube or the like detachable, and the storage means and the detection means are provided. The infusion pump according to claim 1, wherein the driving means is stopped when signals are simultaneously generated.