JP4394072B2 - Infusion pump device - Google Patents

Description

【Technical field】
The present invention relates to a medical infusion pump device used when a drug solution or the like is introduced into a patient's body.
[Background]
As a device of this type, there is a device that feeds a chemical solution by holding a tube for transporting a chemical solution between a plurality of fingers and a presser and swinging the finger with respect to the presser (see, for example, Patent Document 1). ).
[Patent Document 1]
Japanese Patent No. 2510908 (page 2-5, Fig. 1-4)
DISCLOSURE OF THE INVENTION
[Problems to be solved by the invention]
However, the above patent requires troublesome work such as opening and closing the front panel or door when attaching or detaching the tube, and attaching or removing the tube to or from the space formed between the fingers and the presser. There is a problem of becoming.
Therefore, the applicants have filed an application in which a tube is attached to a cassette and is attached and detached with the cassette as Japanese Patent Application No. 2002-310062 (filing date October 24, 2002).
However, in the above application, nothing is specifically shown about the infusion pump device as the main body device into which the cassette is inserted.
Accordingly, an object of the present invention is to provide an infusion pump device that is suitable for use in the cassette type as described above, and is easy to handle with a safe structure.
[Means for Solving the Problems]
In order to solve such a problem, in the first aspect of the invention, there is a housing groove for receiving a cassette in which an infusion tube is set in a housing, and a tube press that presses the infusion tube of the cassette mounted in the housing groove. In an infusion pump device that performs infusion by pressing and permeating the infusion tube by means and a drive means for driving the tube pressing means,
The tube pressing means includes a plurality of eccentric cams stacked in the longitudinal direction of the main shaft, a spiral cam engaged with the main shaft via a one-way bearing, and fingers loosely fitted to the eccentric cams, respectively. The driving means includes a motor and a transmission means for transmitting the rotational operation of the motor to the main shaft, and by rotating the motor forward and reverse, the finger is slid in a direction perpendicular to the main shaft to thereby provide an infusion tube. It is characterized by pressing and releasing.
In the first aspect of the invention, the casing may be provided with a tube hooking portion for preventing the liquid dripping from the outer wall of the infusion tube from entering the device (the second aspect of the invention). In the invention of the second aspect, a sensor for detecting that the cassette in which the infusion tube is set is correctly attached to the receiving groove can be provided (invention of the third aspect). In any one of the first to third aspects of the invention, the finger can be detachably formed from the front side of the apparatus (the fourth aspect of the invention), and any one of the first to fourth aspects. In this invention, fine adjustment means for the accommodation groove width of the cassette can be provided (the invention of the fifth aspect).
Furthermore, in any one of the first to fifth inventions, the infusion set amount can be notified by voice (the sixth invention), and any one of the first to sixth inventions. In the invention, it is possible to display the infusion time or remaining time of the infusion (invention of item 7).
In addition to the above, in the invention of any one of items 1 to 6, liquid feeding can be started by pressing the start button after a predetermined time after mounting the cassette (the invention of item 8). In any one of the first to eighth aspects of the invention, the infusion tube can be closed when a predetermined number or more of droplets are detected within a certain period of time after the cassette is mounted (No. 9 Item invention).
【The invention's effect】
According to the present invention, in the cassette-type infusion pump device, since the infusion tube is pressed and opened by using the normal rotation and reverse rotation of the motor, it is possible to provide a device that is safe and easy to handle. The benefits that are possible are provided. In addition, by providing a tube hooking part on the housing, it is possible to prevent the liquid dripping from the outer wall of the infusion tube from entering the device, and that the cassette in which the infusion tube is set is correctly installed in the receiving groove. By providing a sensor for detection, safety can be improved.
Furthermore, by forming the fingers detachably from the front surface of the apparatus, it is possible to make the structure convenient for maintenance, cleaning, etc., and by providing fine adjustment means for the accommodation groove width of the cassette, variations in the apparatus are eliminated. It becomes possible. In addition, notification of the infusion setting amount by voice can be used to avoid setting mistakes and erroneous operations, and serviceability can be improved by displaying the infusion time or remaining time.
In addition, by pressing the start button after a certain period of time when the cassette is mounted, liquid feeding is started, so that safe operation can be performed without increasing the accuracy of parts of the release pin.
When a predetermined number or more of droplets are detected within a predetermined time after the cassette is mounted, the infusion tube is closed to cope with an abnormality.
[Brief description of the drawings]
1 is a perspective view showing an embodiment of the present invention. FIG. 2 is a front view of an infusion pump device according to the present invention. FIG. 3 is a sectional view taken along line AA 'in FIG. FIG. 6 is a block diagram showing the electrical configuration of the infusion pump device. FIG. 7 is a block diagram showing the eccentric cam assembly. FIG. 8 is an explanatory view of the finger. FIG. FIG. 10 is a front view showing the infusion pump device partially broken before and after mounting the cassette. FIG. 11 is a sectional view taken along the line BB ′ in FIG. 10 and FIG. 12 is a sectional view taken along the line CC ′ in FIG. FIG. 14 is a structural diagram of a seesaw lever. FIG. 15 is a structural diagram of a movable lever. FIG. 16 is an explanatory diagram of attachment of a seesaw lever. FIG. [Sign Explanation of]
DESCRIPTION OF SYMBOLS 1 ... Infusion pump apparatus, 2 ... Cassette, 11 ... Front board, 12 ... Cassette accommodating groove, 13 ... Tube hook part, 14 ... Tube press part, 15 ... Setting and operation part, 16 ... Display part, 17 ... Control circuit, DESCRIPTION OF SYMBOLS 18 ... Tube press part, 19 ... Finger drive part, 20 ... Release pin, 21 ... Infusion tube, 22 ... Tube guide, 23 ... Plate clamp leaf spring, 31 ... Frame upper part, 32 ... Frame lower part, 33 ... Tube presser spring , 181 ... Shaft (main shaft), 182 ... Spacer cam, 183 ... Eccentric cam, 184 ... Spiral cam, 185 ... Finger, 186 ... Recess, 187 ... Finger pressing plate, 188 ... Bearing, 191 ... Motor, 192 ... Timing belt, 193 ... upper arm, 194 ... lower arm, 201 ... seesaw lever, 202 ... movable lever, S1, S2 ... Ttosensa, S3, S4 ... close sensor, S5 ... drip detecting sensor, SP ... speaker, P1, P2 ... pulley.
BEST MODE FOR CARRYING OUT THE INVENTION
1 is a perspective view showing an embodiment of the present invention, FIG. 2 is a front view thereof, FIG. 3 is a cross-sectional view taken along the line AA 'in FIG. 2, FIG. FIG. 6 is a block diagram showing the internal electrical configuration.
As shown in FIG. 1 or FIG. 2, the infusion pump device 1 is composed of a front plate 11, a cassette housing groove 12, a tube hooking portion 13, a tube pressing portion 14, a setting / operating portion 15, a display portion 16, and the like. The
2 in FIG. 2 is an infusion tube (also simply referred to as a tube), and S1 and S2 are cassette sensors for detecting whether or not a cassette is mounted (sensors S1 and S2 are turned on or off to determine “set”). 2 or more are provided). The tube hooking portion 13 is for forming a loop portion for preventing liquid dripping from passing through the outside of the infusion bottle (see FIG. 5) to the infusion tube 21 and entering the apparatus. The presser part 14 presses the infusion tube 21 by a cooperative operation with a finger, which will be described later, and swings it. Moreover, although this tube holding part 14 is fixed with a screw | thread, the groove width of the cassette accommodation groove | channel 12 can be finely adjusted by adjusting this screw | thread, and an individual difference can be absorbed.
Internally, a control circuit comprising a computer is provided, and the input, setting operation state and processing result are displayed on the display unit 16 by input from the setting / operation unit 15, setting operation, or signals from various sensors S1 to S5. Or output sound through the speaker SP (see FIGS. 3 and 6) or drive a motor. For example, if the infusion volume to be charged is set with the operation keys after the cassette is installed, the set volume can be output by voice, or the remaining charging time can be displayed by entering the infusion time. Yes, setting mistakes and erroneous operations can be avoided.
The electrical configuration is shown in detail in FIG. 6. In addition to the setting / operation unit 15 and display unit 16 described above, a control circuit including various amplifiers, error detection units, display circuit units, motor drive units, and the like. Is shown with reference numeral 17.
The cassette 2 holding the infusion tube 21 is inserted in the direction of the arrow in FIGS. 3 and 5 with the tube guide 22 positioned so as to face the spacer cam 182 of the cam assembly described later, as shown in FIGS. By doing so, it is attached to the infusion pump device 1. In the state shown in FIG. 5A in which the cassette 2 is not mounted, the cam assembly is pulled in the direction of the tube pressing portion (front side in FIG. 3) by the pressing spring 33, and FIG. The cassette 2 cannot be attached (detached) unless the eject button shown in FIG. FIG. 5B shows an enlarged drip chamber.
Reference numeral 23 denotes a clamping leaf spring for pressing (closing) the tube 21 so that the infusion solution does not enter a free flow state when the cassette 2 is removed. The clamping leaf spring 23 is attached to the cassette 2. Immediately after the operation, the tube 21 is closed, and when the start button (start button) of the operation / setting unit 15 is pressed, the release pin 20 shown in FIG. 1 is operated to release the clamp by the leaf spring, and the tube 21 is fully opened. To be in the state.
4A and 4B illustrate the state of the tube 21 in the cassette. FIG. 4A is a fully closed state of the tube in which the cassette is not mounted, and FIG. 4B is a closed state of the tube immediately after the cassette is mounted. FIG. 4C shows the tube fully opened at the time of liquid feeding. That is, when the cassette is not attached to the infusion pump device, the tube 21 is sandwiched between the pressure release part 24 and the pressing body 25 by the leaf spring 23 and is fully closed, whereas the cassette is attached. Immediately after that, the release pin 20 is in a state of being temporarily stopped in front of the moving pressure release portion 24, and further, the pressure release portion 24 is sufficiently pushed by the release pin 20 to be fully opened.
As shown in FIG. 3, a tube pressing portion 18 and a finger driving portion 19 are provided inside the main body. The tube pressing portion 18 has a shaft (main shaft) 181 and a single sheet as shown in FIG. The spacer cam 182 includes 12 eccentric cams 183 and a spiral cam 184 combined with a one-way bearing (bearing), and is held between the fixed frames 31 and 32. The spiral cam 184 engaged with the shaft 181 (main shaft) via a one-way bearing (bearing) rotates free of rotation of the main shaft when the main shaft 181 rotates in the forward direction (operation). Then, the movement of the spiral cam 184 is converted into a rotation operation of a movable lever and a seesaw lever, which will be described later, and the release pin 20 is moved to operate the leaf spring 23 of the cassette 2 to open the infusion tube 21. On the other hand, at the time of reverse rotation of the main shaft 181 (when the apparatus is stopped), the main shaft 181 is locked to the rotation of the main shaft 181 and reversely rotated together, thereby moving the main shaft to an open position where the fingers are separated from the tube and stopping. The eccentric cams 183 that are in contact with each other are shifted from each other by 30 °, and are attached to the shaft 181 so as to make one rotation with 12 sheets, thereby giving a peristaltic motion to the tube. 7A is a cross-sectional view showing the cam assembly, and FIG. 7B is a side view of the cam assembly as viewed from the right side of FIG. 7A.
Fingers 185 are further loosely fitted or engaged with the eccentric cams 183, and the fingers 185 slide in a direction perpendicular to the axial direction of the main shaft 181 by the rotational movement of the eccentric cams 183. Exercise is performed. An example of fingers that engage with the eccentric cam 183 is shown in FIG. FIG. 8A is a plan view and FIG. 8B is a side view thereof. Reference numeral 186 denotes a notch formed in the finger, which forms a recess that loosely fits or engages with the eccentric cam. With the front plate 11 opened, this recess 186 is in the direction of the arrow in FIG. The finger 185 can be attached to the main shaft simply by being inserted toward the head. Moreover, when removing, it can be easily removed simply by pulling in the direction opposite to that at the time of wearing, and has a structure convenient for maintenance, cleaning, and the like.
Note that the finger 185a loosely fitted or engaged with the spacer cam 182 is configured in the same manner as the fingers shown in FIGS. 8A and 8B, as shown in FIGS. 8C and 8D. Reference numeral 186a denotes a recess. The finger 185a is formed with an engaging portion that mechanically engages with the tube guide 22 (see FIG. 3) of the cassette when the cassette 2 is mounted. The fingers 185 and 185a constitute a finger unit.
The case where the tube pressing part 18 is seen from the front is shown in FIG. FIG. 10A shows an open state of the finger or tube, and FIG. 10B shows a pressed state (closed state) of the finger or tube. Here, the front plate 11 of the main body is shown in an open state, but when the front plate 11 is closed, an eccentric cam assembly including one spacer cam 182 and 12 eccentric cams 183 is shown in FIG. A finger pressing plate denoted by reference numeral 187 in (a) is pressed upward in FIG. 11 (a). In addition, by removing the finger pressing plate 187, the tube pressing portion 18 can be seen as shown in FIG. 10, and therefore the operation of the finger can be observed from the front side even when the apparatus is operating. In FIG. 11A, reference numeral P1 is a pulley engaged with each main shaft on the motor 191 side, and reference numeral P2 is engaged with each main shaft on the eccentric cam assembly side.
As shown in FIGS. 9, 11, and 12, the finger driving unit 19 is coupled to the motor 191, a timing belt 192 that transmits the rotation to the tube pressing unit, the tube pressing unit, and the shafts of the finger driving unit 19. It consists of arms 193, 194, etc., and is held between the fixed frames 31, 32, like the tube pressing part 18. Reference numeral 33 denotes a tube pressing spring for biasing the eccentric cam assembly. In addition, Fig.11 (a) and FIG.12 (a) show the open state of a finger, FIG.11 (b) and FIG.12 (b) show the press state of a finger, respectively. In FIG. 12A, symbol S3 indicates a sensor that detects the opened state of the cassette, and S4 indicates a sensor that detects the closed state.
FIG. 13 is an operation explanatory diagram of the infusion pump device.
FIG. 4A shows when the apparatus is stopped, FIG. 4B shows when the operation is started, and FIG. 4C shows that the device is in operation, and corresponds to FIG.
When the apparatus is stopped, as shown in FIG. 13A, the spiral cam 184 is locked with respect to the main shaft 181, the convex portion or the peak portion engages with the bearing 188, and the finger moves to the open position away from the tube 21. On the other hand, the leaf spring of the cassette 2 acts to press (close) the tube.
When the start button is pressed within a predetermined time from the state where the cassette is mounted, the spindle 181 rotates in the A (forward or positive) direction in FIG. 13B, and the bearing 188 rotates in the B direction around the fulcrum S. . As a result, the movable lever 202 is rotated in the C direction, the seesaw lever 201 attached on the lower arm 194 is rotated in the C direction, the release pin 20 is slid in the D direction, and the clamping leaf spring 23 is pushed. Since the tube 21 is opened, the liquid can be fed. That is, when the motor 191 rotates in the positive (A) direction, as shown in FIG. 13C, the concave portion or valley portion of the spiral cam (184) of the tube pressing portion 18 engages with the bearing 188 of the movable lever 202, Since the main shaft 181 rotates freely, each finger 185 that engages with each cam attached to the main shaft 181 performs a squeezing (pressing) operation of the tube mounted on the cassette, and liquid feeding is performed. Become.
Here, the seesaw lever and the movable lever are configured as shown in FIGS. 14 and 15, respectively. 14B is a plan view, FIGS. 14A and 14C are side views thereof, FIG. 15A is a plan view, and FIGS. 15B and 15C are side views thereof. Among these, the seesaw lever 201 is attached to the lower arm 194 as shown in FIG. 16, and the movable lever 202 is combined with them as shown in FIG. That is, when the apparatus is stopped, the seesaw lever 201 is separated from the release pin 20 as shown in FIG. 17A, but the recess or valley of the spiral cam 184 is the bearing of the movable lever 202 as shown in FIG. When the movable lever 202 is pulled by the spring 203, the seesaw lever 201 is also rotated, and the release pin 20 is pushed through the section (201a: see FIG. 16B). It will be.
[Industrial applicability]
As described above, if the start button is pressed within a certain time after the cassette is mounted, the liquid feeding operation is started. Within a certain time, a predetermined number (for example, 10 or more) is detected by the drip detection sensor S5 shown in FIG. ) When the above drop is detected, the infusion tube can be closed as an abnormality. This can be easily realized by introducing the output of the drip detection sensor S5 into the control circuit 17 of FIG.
The eccentric cam assembly is urged toward the tube pressing portion 14 by the pressing spring 33 at the normal time when the motor does not rotate. This is for ensuring safety (fail safe) by preventing the free flow by setting the tube or finger in the direction to be pressed during a power failure or power-off. Therefore, as described above, it is necessary to operate the take-out button and rotate the motor in the reverse direction when attaching or detaching the cassette.

Claims (9)

An infusion tube having a housing groove for receiving a cassette in which an infusion tube is set in the housing, a tube pressing means for pressing the infusion tube of the cassette mounted in the housing groove, and a driving means for driving the tube pressing means In an infusion pump device that performs infusion by pressing and perturbing,
The tube pressing means includes a plurality of eccentric cams stacked in the longitudinal direction of the main shaft, a spiral cam engaged with the main shaft via a one-way bearing, and fingers loosely fitted to the eccentric cams, respectively. The driving means includes a motor and a transmission means for transmitting the rotational operation of the motor to the main shaft, and by rotating the motor forward and reverse, the finger is slid in a direction perpendicular to the main shaft to thereby provide an infusion tube. An infusion pump device characterized in that the pressure is released and released. 2. The infusion pump device according to claim 1, wherein the housing is provided with a tube hooking portion for preventing the liquid dripping from the outer wall of the infusion tube from entering the device. 3. The infusion pump device according to claim 1 or 2, further comprising a sensor for detecting that the cassette in which the infusion tube is set is correctly installed in the housing groove. The infusion pump device according to any one of claims 1 to 3, wherein the fingers are formed detachably from the front side of the device. The infusion pump device according to any one of claims 1 to 4, further comprising fine adjustment means for the accommodation groove width of the cassette. 6. The infusion pump device according to any one of items 1 to 5, wherein an infusion set amount of infusion can be notified by voice. 7. The infusion pump device according to any one of items 1 to 6, wherein an infusion time or a remaining time can be displayed. 8. The infusion pump device according to any one of claims 1 to 7, wherein liquid feeding is started by pressing a start button after a predetermined time after mounting the cassette. The infusion pump device according to any one of claims 1 to 8, wherein the infusion tube is closed when a predetermined number or more of droplets are detected within a predetermined time after the cassette is mounted. .

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