JP2010088564A - Syringe pump - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a syringe pump with various syringes mounted and fixed to feed liquid by extruding pusher flanges of pushers of the mounted syringes with a slider, being easily cleaned. <P>SOLUTION: The syringe pump includes: an axially long box-shaped body of syringes mounted on the syringe pump; a syringe mounting part for mounting an outer barrel of the syringe; the slider for holding the pusher of the mounted syringe; a drive rod 63 extending from a round hole 200 on a wall surface 36c of the body connected to the slider to slide the slider by the advancing/retreating motion; an elastic bellows cylinder 62 surrounding the drive rod 63 between the body and the slider; and a hollow nylatch 206 for pressing and fixing an annular projection 204 overhanging in the direction of the inner diameter at an end of the bellows cylinder 62, onto the peripheral surface around the round hole 200. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  TECHNICAL FIELD The present invention relates to a syringe pump that places and fixes various syringes and feeds liquid by pushing out a pusher flange of a pusher in the placed syringe with a slider.

  In an intensive care unit (ICU) or the like, a syringe pump is widely used when a liquid medicine or a nutrient is delivered to a patient accurately and over a long period of time. The syringe pump can perform high-precision liquid feeding by placing and fixing various syringes and pushing out a pusher flange of the pusher in the placed syringe while accurately controlling the speed with a slider.

  The syringe pump can be mounted with syringes of various sizes, and has a configuration in which the amount of liquid to be fed can be set easily, and is highly versatile. Such a syringe pump is disclosed in Patent Document 1 and Patent Document 2, for example.

  In the syringe pump, in order to place various sizes of syringes and send liquids, the syringe pump is placed with a clamp that is pulled down by an elastic body and is in contact with the upper surface of the placed outer cylinder and fixed. A lever for holding the pusher flange of the pusher in the syringe on the slider is provided. The clamp can be selected by rotating between a release position and a fixed position, and the outer cylinder can be fixed by being lowered elastically at the fixed position. The lever is provided with a pair of elastically openable / closable levers, and can be fixed to the slider by sandwiching pusher flanges of various diameters.

  The drive rod extends from a predetermined hole in the main body and is connected to the slider, and a telescopic bellows cylinder surrounding the drive rod is provided between the main body and the slider.

  Furthermore, the liquid supply amount can be easily set by a rotary setting dial. The setting dial is rotatably inserted into the dial hole on the side surface in the longitudinal direction of the main body, and the side surface is exposed.

  Syringe pumps are basically a safeguard because when the syringe is set, the chemicals in the syringe may spill out, the instilled solution provided above may spill out, or the disinfectant used in the surrounding area may splash and fall. It has a spray structure.

  For this reason, the connection between the bellows cylinder and the main body is fixed in a liquid-tight manner so that water droplets and the like do not enter, and the setting dial is configured to rotate by being externally fitted to an embedded shaft embedded in the main body. There is no ingress of water into the cage.

JP 2004-73373 A JP 2007-306990 A

  Even if chemical liquid spills into the syringe pump, it does not enter the inside due to the splash-proof structure and there is no hindrance to the operation. Sometimes it is desirable to clean the deposits.

  However, since the bellows tube is provided at the position where the slider slides, the bellows tube becomes an obstacle and it is difficult to clean the surface of the main body. Further, since the gap between the setting dial and the dial hole is very narrow, cleaning is difficult when a chemical solution or the like accumulates in this portion and solidifies.

  The present invention has been made in view of such problems, and an object of the present invention is to provide a syringe pump that is difficult to be contaminated with a chemical solution or the like and that can be easily cleaned even when it is contaminated.

  A syringe pump according to the present invention includes a housing that houses an actuator, a syringe placement portion that is provided in the housing and places an outer cylinder of the syringe, and a syringe pusher placed on the syringe placement portion. A holding rod, a drive rod driven by the actuator, extending from a hole in the housing, connected to the slider, moving the pusher by sliding the slider, and the housing and the slider. The drive rod is surrounded by an annular projecting portion projecting in the inner diameter direction at the end on the housing side, and the telescopic bellows tube and the annular projecting portion are pressed against the peripheral surface of the hole and fixed. And a ny latch.

  If the bellows tube is fixed to the hole of the housing by the ny latch in this way, the bellows tube can be removed from the outside of the main body as needed, and the main body side portion that is normally hidden by the bellows tube can be easily cleaned. can do. The nylatches are structurally prevented from being removed inadvertently and maintain water resistance and reliability.

  Note that it is preferable that the ny latch has a hollow structure because the drive rod can be inserted therethrough.

  Here, the ny latch is a fixing tool for attaching a predetermined member to the hole of the wall body, and includes a grommet inserted into the hole with a plurality of thick snap fits arranged in an annular shape, and the grommet By being inserted into the hollow portion and displaced in the axial direction, the snap fit has a plunger that is appropriately expanded and held from the inner diameter side. The tip thick part of the snap fit penetrates the hole, and by holding the snap fit, the tip thick part can fix and prevent the hole from being removed.

  The ny latch includes a grommet having a plurality of snap fits, and a plunger that is inserted into the grommet and spreads the plurality of snap fits outward, and each of the grommets and the plunger has a flange on a proximal end side. When the plunger is inserted into the grommet, the flanges are adjacent to each other, and each flange has a tapered surface on the opposite side, and the two tapered surfaces form a V-shaped cross section. Good. According to such a tapered surface, by inserting the thin rod into the annular groove portion having a V-shaped cross section to be formed, the engagement state between the grommet and the plunger and the fixation of the bellows by the ny latch are released, and the bellows cylinder is removed from the main body. be able to.

  A syringe pump according to the present invention includes a housing that houses an actuator, a syringe placement portion that is provided in the housing and places an outer cylinder of the syringe, and a syringe pusher placed on the syringe placement portion. A slider to be held, a rotary setting dial for setting the amount of liquid medicine to be fed in the syringe, and a side surface of the housing, the setting dial being rotatably arranged to expose the side surface of the setting dial The dial arrangement hole is provided with a depression on the outer diameter side and a side depression that opens to the side.

  According to such a side recess, even when a chemical solution or the like enters the gap between the narrow setting dial and the dial hole, the chemical solution or the like is easily discharged from the side recess and is accumulated and solidified in this portion. No dirt and easy to clean. The liquid feeding amount here is generally a liquid feeding amount per unit time, but may be an integrated total liquid feeding amount depending on design conditions.

  When the side recess is a tapered portion having a predetermined width that expands toward the outer diameter side in the opening direction, the chemical solution or the like can be more easily discharged.

  The inclination of the side recess may be 5 ° to 30 ° with respect to the axial direction of the setting dial. By setting the inclination of the side concave portion to 5 ° to 30 °, it does not become unnecessarily steep and is sufficient for discharging the chemical liquid and the like.

  The side recess may be set at a position including a vertically lower portion when tilted forward by 60 ° with respect to the vertically downward direction of the syringe pump.

  The side recess may be set at a position including a position of 60 ° forward, with the axis of the setting dial as a center, and a vertical lower position in a horizontal surface mounted state. Syringe pumps are often used in a state of being inclined moderately. When tilted 60 ° forward with respect to the vertically downward direction, the predetermined angle width is set to a position including the vertically lower side, so that the chemical solution and the like can be easily discharged in a general tilt use state.

  The angle width of the side recess may be 30 ° to 90 °. By setting the predetermined angular width to 30 ° to 90 °, it is not unnecessarily wide and is sufficient for discharging a chemical solution or the like.

  According to the syringe pump according to the present invention, the bellows cylinder is fixed to the hole of the main body by the ny latch, and the bellows cylinder can be removed from the outside of the main body as necessary, and is normally hidden by the bellows cylinder. The part can be easily cleaned.

  Further, according to the syringe pump according to the present invention, by providing a side recess in the dial arrangement hole, even when a chemical solution or the like enters the gap between the narrow setting dial and the dial hole, the drug solution or the like can be easily removed from the side recess. It is discharged and does not accumulate and solidify in this part, is difficult to get dirty, and is easy to clean.

  Embodiments of the syringe pump according to the present invention will be described below with reference to FIGS. First, the syringe 12a applied to the syringe pump 10 according to the present embodiment will be described.

  As shown in FIG. 1, the syringe 12 a is a conventional general-purpose product, and includes a syringe outer cylinder (outer cylinder) 18 and a pusher 16. The syringe outer cylinder 18 includes a transparent syringe body 14 filled with a chemical solution, the outer cylinder flange 20 provided on the proximal end side, and a discharge port 24 provided on the distal end side to which the tube 22 is connected. The outer cylinder flange 20 has a substantially elliptical shape, the width in the short diameter direction is slightly wider than the diameter of the main body 14, and the width in the large diameter direction is set to a width that allows a person to put a finger on it. Yes. The outer cylinder flange 20 is reasonably thin, for example, has a thickness of about 1 to 2 mm. One end of the tube 22 is connected to the discharge port 24, and the other end is connected to an indwelling needle or the like (not shown) so that the drug solution can be injected into the patient.

  The pusher 16 includes a gasket 26 that is provided at the distal end and sends out the chemical solution in the syringe outer cylinder 18, a disc-like pusher flange 28 on the proximal end side, and a rib 30 that connects the gasket 26 and the pusher flange 28. Have The pusher flange 28 has an area that can be pushed by a person with a thumb and is appropriately thin, for example, about 1 to 2 mm. The rib 30 has a cross-sectional shape that is thick at the distal end and thin at the proximal end, and has a sufficient rigidity and a lightweight configuration. A plurality of sizes of syringes (for example, 5 mL type, 10 mL type, 20 mL type, 30 mL type, 50 mL type, 100 mL type) can be applied to the syringe pump 10, and the syringe 12a is the longest and maximum diameter type. (Maximum capacity type, for example, 100 mL type). The syringe 12b shown in FIG. 1 is the shortest and thinnest type (minimum capacity type, for example, 5 mL type). A syringe applicable to the syringe pump 10 is also typically referred to as a syringe 12.

  Hereinafter, in the description of the syringe pump 10, the long width direction is referred to as the X direction, the short width direction is referred to as the Y direction, and the height direction is referred to as the Z direction. As necessary, with reference to FIG. 1, the left side in the X direction is also referred to as the X1 direction, and the right side is also referred to as the X2 direction.

  As shown in FIGS. 1-3, the syringe pump 10 which concerns on this Embodiment is comprised based on the box-shaped housing 11 a little long in the X direction, and can be recognized planarly (it can recognize in FIG. 1). Therefore, the lower half of the operation section 32, the upper half of the syringe mounting section 34, and the upper half of the pusher drive section 36 are provided. . A handle 37 is provided at the left end of the syringe pump 10 and is excellent in portability. The substantially entire upper surface of the syringe pump 10 has a substantially planar shape that forms a very gentle arc with respect to the depth direction. The syringe pump 10 has a highly water-resistant structure in which each switch (for example, a tact switch) of the operation unit 32 is covered with a surface decorative sheet.

  The syringe pump 10 has a basic structure because when the syringe 12 is set, the chemical solution in the syringe 12 may spill out, the instilled drug provided above may spill out, or the disinfectant used in the vicinity may scatter. It has a splash-proof structure.

  The syringe pump 10 has an AC cable 39a connected to a power outlet (power terminal) 39 provided at the lower side of the side surface, and is supplied with electric power from an external power source (AC100V, AC200V, etc.).

  In the following description, the vertical direction is defined as a state in which the syringe pump 10 is placed on a horizontal desk, but the actual direction of use is not limited to this, and for example, as shown in FIG. It may be used in a state where it is fixed and set obliquely. The mounting tool 402 can adjust the inclination angle and height while holding the syringe pump 10 stably. Further, it is preferable that the mounting tool 402 can supply power to a dedicated terminal (not shown) different from the power outlet 39.

  Returning to FIGS. 1 to 3, the syringe mounting part 34 is a part for mounting and fixing the syringe outer cylinder 18 in the direction in which the discharge port 24 is on the left side, and the syringe outer cylinder 18 ( A curved portion 38 having a concave arcuate surface corresponding to the diameter of the largest diameter) is provided. The bending portion 38 forms a concave circular arc column surface based on the axial direction (X direction) of the syringe outer cylinder 18 to be placed.

  The bending part 38 is located in the substantially right half in the syringe mounting part 34, and is comprised by the wall part provided in the near side and the back | inner side. The curved portion 38 includes a narrow groove 38a extending in the axial direction on the lowermost surface, two axially adjacent detection switches (syringe outer tube detecting portions) 40a and 40b provided in the vicinity of the X2 direction, and the X2 direction. It has a longitudinal set groove 42 provided at the end and holding the outer cylinder flange 20, and a spring body 44 that elastically presses and stabilizes the mounted outer cylinder flange 20.

  The set groove 42 is a shallow groove on which the outer cylinder flange 20 is mounted and placed, and has a shape in which the maximum radial direction of the outer cylinder flange 20 is vertical, and is a first groove that forms the slider 60 side. It is comprised by the wall 42a and the 2nd groove wall 42b which comprises the syringe mounting part side. Since the thickness of the outer cylinder flange 20 differs depending on the manufacturer, the groove width of the set groove 42 is formed to be about 3.5 mm with an appropriate margin. By this set groove 42, the syringe outer cylinder 18 is properly positioned in the axial direction.

  When the syringe outer cylinder 18 is placed on the syringe placement section 34, the claw 44c of the spring body 44 abuts on the lowermost portion of the outer cylinder flange 20 attached to the set groove 42, and the side of the syringe placement section 34 (X1). To the end face of the second groove wall 42b. This eliminates the shakiness in the axial direction of the syringe outer cylinder 18 and enables stable liquid feeding, and when the slider 60 starts to push the pusher 16, the liquid feeding can be started immediately. The flow rate rise performance is improved.

  The narrow groove 38a stabilizes the small-diameter syringe 12b when it is placed.

  The two detection switches 40a and 40b slightly protrude from the lower surface, and can be detected when the syringe outer cylinder 18 is placed by being pushed in by correctly placing the syringe outer cylinder 18 respectively. . The axial distance between the two detection switches 40a and 40b is preferably 5 mm to 10 mm, covered with a single ethylene / propylene rubber film, and has high water resistance and weather resistance. The ethylene / propylene rubber film and the curved portion 38 are preferably white so that the black-printed scale provided on the syringe outer cylinder 18 is easy to see. You may provide three or more detection switches 40a and 40b within the range of the length in which the syringe outer cylinder 18 of the shortest type syringe 12 is mounted. The two detection switches 40a and 40b do not necessarily have to be arranged linearly, and may be arranged at different positions in the axial direction of the syringe 12 placed.

  As shown in FIG. 3, the spring body 44 is made of resin, and includes a mounting plate 44a attached to the side surface of the curved portion 38, a spring plate portion 44b protruding upward from the mounting plate 44a, and the spring plate portion 44b. A short claw 44c that is bent at an acute angle from the tip of the pin and heads obliquely downward, and a pair of thin protrusions (projections) 44d that protrude downwardly upward on both sides of the connecting portion between the spring plate portion 44b and the claw 44c. The mounting plate 44a is attached to the side surface of the first groove wall 42a by a screw, and the claw 44c slightly enters the set groove 42. The pair of protrusions 44d form an XZ plane and have a mountain shape when viewed from the Y direction.

  A clamp 50 is provided on the border between the operation section 32 and the syringe mounting section 34 on the front side of the detection switches 40a and 40b. Yes. The clamp 50 includes an elevating rod 52 that protrudes from the upper surface of the operation unit 32, and a rotating lever 54 provided at the upper end of the elevating rod 52. The rotary lever 54 has a size and a shape that can be easily operated manually. When the syringe 12 is not placed, the elevating rod 52 is pulled down by an elastic body (not shown), and the rotating lever 54 is disposed substantially horizontally from the elevating rod 52 in the X1 direction.

  After fixing the syringe outer cylinder 18 on the syringe mounting portion 34, when fixing the syringe 12, first, the clamp 50 is pulled up by holding the rotation lever 54 until the rotation is restricted by a predetermined stopper. Rotate 90 ° clockwise. Next, while holding the rotation lever 54, the entire clamp is lowered by the elastic force of the elastic body, the upper surface of the syringe outer cylinder 18 is elastically contacted by the lower surface of the rotation lever 54, and is pressed and fixed with an appropriate force. (See FIGS. 2 and 8). The rotation lever 54 presses and fixes the vicinity of the outer cylinder flange 20 in the syringe outer cylinder 18.

  The raising / lowering rod 52 can detect the amount of lowering by a clamp sensor (clamp detection unit) 136 (see FIG. 5), and can identify the syringes 12 a, 12 b and the like as objects fixed by the rotation lever 54. The reverse operation may be performed when releasing the fixation of the syringe outer cylinder 18. The clamp sensor 136 may detect the rotational state.

  In the vicinity of the clamp 50 in the operation unit 32, a clamp confirmation LED 58 that switches from a light-off state to a blinking state when it is determined that the pair of detection switches 40 a and 40 b are off or the clamp 50 does not fix the syringe outer cylinder 18. Is provided. A symbol is drawn adjacent to the clamp confirmation LED 58, and the operator can conceptually understand the function.

  The pusher drive unit 36 includes a step surface 36a lower than the operation unit 32, a substantially vertical wall surface 36b between the step surface 36a and the operation unit 32, and a substantially vertical wall surface between the syringe mounting unit 34. It is provided in a space section defined by 36c. The pusher drive unit 36 includes a slider 60 that moves in the X direction, and a flexible and extendable bellows cylinder 62 that connects the slider 60 and the wall surface 36c.

  The slider 60 is a box that is rounded so that it can be easily operated at a position where the bottom is near the stepped surface 36a and the upper surface is appropriately higher than the operation surface of the operation unit 32. The slider 60 has a pusher detection switch (pushing detection unit) 64 provided at a position where the pusher flange 28 of the syringe 12 abuts on the connection surface 62a on the X1 direction side, and the pusher flange 28 contacts the connection surface 62a. A pair of levers 66 that are fixed in contact with each other, an arcuate support base 68 that is provided on the connection surface 62a and supports the pusher flange 28, and a lock lever 70 that fixes and releases the slider 60 in the sliding direction. Have.

  The slider 60 has a function of holding the pusher flange 28 of the pusher 16 in the mounted syringe 12 with a lever 66 and pushing out the pusher 16. The pusher detection switch 64 is turned on when the pusher flange 28 comes into contact therewith.

  The lock lever 70 protrudes from the side surface of the slider 60 to the near side when not operated, and allows the slider 60 to be manually slid in the X direction by fixing the slider 60 and pressing it elastically. The operation state of the lock lever 70 is detected by a lock sensor 138.

  The pair of levers 66 has an inward arc shape that is symmetrical with respect to the axis of the syringe 12, and is tilted about the lower shafts 66 a in conjunction with pushing the lock lever 70 so as to be separated from each other. The two sides of the pusher flange 28 can be gripped by elastically closing in conjunction with opening and releasing the lock lever 70. The lever 66 holds the outer peripheral surface of the pusher flange 28 and the surface on the X2 direction side, and can prevent the pusher flange 28 from coming off the slider 60. The pusher flange 28 is held and stabilized at three locations of the pair of levers 66 and the support base 68.

  A slider confirmation LED 72 is provided on the upper surface of the slider 60. When the slider 60 is moved manually, the pusher flange 28 comes into contact with the side surface thereof, the pusher detection switch 64 is turned on, the lock lever 70 is released, and the lever 66 is fixed to the slider 60. When it is determined that the slider 60 is fixed, the slider confirmation LED 72 changes from the blinking state to the unlit state.

  The slider 60 is provided in the bellows cylinder 62 in a state in which the clamp confirmation LED 58 and the slider confirmation LED 72 are turned off (that is, a state in which the syringe 12 is accurately placed; hereinafter referred to as a normal syringe placement state). Further, the drive rod 63 (see FIG. 5) can be automatically advanced in the X1 direction by the retraction operation.

  The drive rod 63 determines the retraction speed based on the liquid feeding amount set by the setting dial 86 and the type of the syringe 12 detected by the clamp 50, and pushes the pusher 16 while accurately controlling the speed. Pump the solution.

  The operation unit 32 includes a power switch 80, a green external power lamp 82, and a red battery lamp 84 regarding the power function. The external power lamp 82 is turned on when the external power source detecting unit 125 (see FIG. 5) determines that an external power source is connected to the power outlet 39. The battery lamp 84 flashes when the remaining charge (also referred to as SOC (State of Charge)) of the lithium ion battery (secondary battery) 122 decreases. When the remaining amount of charge of the lithium ion battery 122 decreases, a warning by the buzzer 144 and a character display by the liquid crystal monitor 102 are also performed. The remaining charge amount of the lithium ion battery 122 is detected by a predetermined charge amount detection sensor 151 (see FIG. 5). By operating the power switch 80, the internal main contactor 152 (see FIG. 5) is turned on, and the power supply of the syringe pump 10 as a whole is turned on.

  The operation unit 32 includes a setting dial 86 and a set liquid supply amount display unit 88 regarding the operation of the liquid supply amount. The setting dial 86 is rotatably arranged in the bottomed dial arrangement hole 91 on the side surface in the longitudinal direction of the syringe pump 10, and the side surface is exposed.

  The dial arrangement hole 91 has a vertically long cutout 91a that exposes an upper portion of the setting dial 86 on the upper surface, and a side recess 91b that has a tapered shape with a predetermined width that widens toward the outer diameter side in the opening direction. In the setting dial 86, a dial rotation sensor 150 (see FIG. 5) in the main body reacts to a magnetic body provided in the setting dial 86 by rotating a portion exposed from the side surface or the vertically cutout portion 91a with a finger. Thus, the rotation direction and the rotation amount can be detected. The dial rotation sensor 150 is, for example, a hall element. The setting dial 86 can be rotated endlessly. The polarity of increase / decrease in the amount of liquid delivered by the setting dial 86 is positive in the upper direction (clockwise in a side view) and negative in the lower direction (counterclockwise in a side view), as indicated by a nearby polarity display symbol 87. The polarity display is also provided on the side surface of the main body (see FIG. 3). The liquid supply amount set by the setting dial 86 may be recorded on the non-volatile scale 116 and held even after the power is turned off.

  The set liquid supply amount display unit 88 is provided with five 7-segment LEDs, and displays the set liquid supply amount [mL / h] set by the setting dial 86 with a maximum of five digits. The set liquid supply amount display unit 88 includes a four-digit integer part 88a that lights in green, a one-digit decimal part 88b that lights in red, and a red decimal point LED 88c arranged therebetween. The decimal part 88b is slightly smaller than the integer part 88a. According to such a configuration, the confirmation of the digit is further facilitated by the difference in color and size and the indication of the decimal point. In particular, since the decimal part 88b and the decimal point LED 88c are displayed in red having a warning effect, it is emphasized that the part indicated by these is a part related to the decimal, and the confirmation of the digit becomes easy. The set liquid supply amount display section 88 is arranged in the vicinity of the setting dial 86, and the correspondence relationship is easily understood by the operator.

  The operation unit 32 includes a start switch 90a, a stop switch 90b, and a fast-forward stop switch 90c for the liquid feeding operation. The start switch 90a is effective when the syringe is in a normal state.

  The operation unit 32 includes an operation indicator 92, an occlusion pressure monitor 94, and a remaining amount detection LED 96 as a display unit related to the liquid feeding state.

  The operation indicator 92 protrudes in a low truncated cone shape as a whole, and is composed of four LEDs in a 90 ° section in plan view. Each LED is a two-color type that can be lit in red and green. The operation indicator 92 is an image in which the rotating body is rotating according to the liquid feeding state, and the four LEDs are green and repeatedly light up in order in the clockwise direction. The operation indicator 92 flashes red when various abnormalities are detected, such as when it is determined that the tube 22 is blocked. Since the operation indicator 92 has a protruding shape, it is excellent in visibility from the side as well as the upper side.

  The occlusion pressure monitor 94 indicates the occlusion state of the tube 22 determined from the pressure generated in the syringe outer cylinder 18 by four lightable symbols 94a, 94b, 94c and 94d. The symbols 94a to 94d are arranged from the left to the right. When the pressure is sufficiently low, all of the symbols 94a to 94d are turned off, and the symbols 94a, 94b, and 94c are turned on in order as the pressure increases. When the specified pressure is reached from the state in which the .about.94c is lit, it is determined that the tube 22 is blocked, and the symbol 94d is blinked in the state in which the symbols 94a to 94c are lit.

  The remaining amount detection LED 96 blinks as an alarm when it is determined that the remaining liquid amount in the syringe 12 has decreased. What is necessary is just to obtain | require the residual liquid amount in a syringe from the position of the slider 60. FIG.

  The operation unit 32 includes a liquid crystal monitor 102, function switches 104 a, 104 b, 104 c, and an integration clear switch 106 as information input / output means 100.

  The liquid crystal monitor 102 has a reasonably wide area suitable for visual recognition at a position with good visibility. The LCD monitor 102 is a dot matrix type and can display various symbols and character strings arbitrarily while being simple, inexpensive and power-saving. Of course, different types of languages can be displayed depending on the destination. is there. The liquid crystal monitor 102 has a horizontally long shape corresponding to the operation unit 32, for example, 240 × 64 dots and a shape of 99.5 mm × 28.0 mm. The liquid crystal monitor 102 has a backlight function that can be turned on / off in red and white.

  The integration clear switch 106 is a switch for clearing the value of the liquid supply integration amount displayed on the liquid crystal monitor 102 at that time, and a line connecting the two is printed to clearly show the relationship with the liquid crystal monitor 102. Yes.

  The function switches 104 a to 104 c are arranged at equal intervals on the lower side of the liquid crystal monitor 102 and correspond to three option displays displayed on the lower part of the liquid crystal monitor 102.

  As shown in FIG. 5, the syringe pump 10 is a computer (control unit) 110 that performs overall control, and the computer 110 is a one-chip microcomputer, for example, a ROM 112, a RAM 114, a nonvolatile memory (flash memory). Etc.) 116 and a clock 118. The computer 110 has an interface (not shown), and performs input / output processing for each sensor, each switch, and each lamp described above. The clock 118 can be corrected at present by a predetermined operation, and can acquire the current time, measure the elapsed time of a predetermined work, measure the reference time of speed control, and the like.

  The syringe pump 10 is supplied with alternating-current (or direct-current) external power, and is supplied with power from the power outlet 39 through the power supply unit 120 and can be supplied with power from the power outlet 39 through the power supply unit 120. A lithium ion battery (secondary battery) 122 and an external power source detection unit 125 that detects a connection state of the external power source to the power outlet 39 are included. The power supply unit 120 generates stable DC power from AC and supplies it to each unit. The lithium ion battery 122 can operate for a considerably long time. The power supply unit 120 does not need to be built in the syringe pump 10 and may be provided outside as a DC adapter, for example.

  The computer 110 displays information for prompting the connection of the external power source on the liquid crystal monitor 102 when it is determined that the external power source is not connected based on the signal obtained from the external power source detection unit 125 (see FIG. 5). ) The external power lamp 82 is turned off.

  In the syringe pump 10, the drive rod 63 that slides the slider 60 is driven by the motor 128 in the housing 11, and the drive amount is detected by the encoder 130. The drive current of the motor 128 is detected by the current sensor 132. The motor 128 is driven via the motor driver 134 under the action of the computer 110. The computer 110 detects the pressure applied to the slider 60 with a strain gauge and controls lighting of the operation indicator 92 and the occlusion pressure monitor 94.

  The displacement amount of the elevating rod 52 is detected by the clamp sensor 136, the operation state of the lock lever 70 is detected by the lock sensor 138, and each signal is supplied to the computer 110 to fix the syringe outer cylinder 18 by the clamp 50 and the slider. 60 is determined to be fixed. In the computer 110, when it is determined that the detection switches 40a and 40b are turned on and the clamp 50 has fixed the syringe outer cylinder 18, the clamp confirmation LED 58 is turned off, the pusher detection switch 64 is turned on, and the slider 60 is fixed. When the determination is made, the slider confirmation LED 72 is turned off.

  The computer 110 controls the display of the liquid crystal monitor (display unit) 102 via the liquid crystal driver 140 and turns on the backlight 142 at a predetermined timing. In addition to the liquid crystal monitor 102, a buzzer 144, a speaker 146, a communication port 148, and a nurse call output unit 149 are connected to the computer 110 as general-purpose output means. The communication port 148 can input / output information to / from a predetermined external computer. In the following description, the buzzer 144 is sounded acoustically as a predetermined alarm and warning, but a predetermined sound or voice guidance may be provided from the speaker 146.

  Next, the operation of the liquid crystal monitor 102 in the syringe pump 10 configured as described above will be described. In the syringe pump according to the present embodiment, information that is detailed, diverse, and easy to understand for those unfamiliar with the operation can be displayed as symbols and character strings on the liquid crystal monitor 102 according to the operating state. (1) Display at the time of setting the syringe 12 to the syringe pump 10, (2) Display regarding the power supply state, (3) Display when alarm is generated, and (4) When performing the specified inspection operation The display can be suitably performed. First, the display at the time of operation which sets the syringe 12 with respect to the syringe pump 10 of (1) term is demonstrated.

  When the operator activates the syringe pump 10 by pressing the power switch 80, the computer 110 prompts three operations for setting the syringe 12, performs a predetermined initial process, confirms each operation, and displays a confirmation result. The three operations for setting the syringe 12 are the following a operation, b operation and c operation as a general and preferable operation order (the a operation, b operation and c operation are names for convenience). The order of the three operations for setting the syringe 12 may be performed, for example, by reversing the b operation and the c operation.

  As shown in FIG. 6, the a operation is an operation of placing the syringe outer cylinder 18 of the syringe 12 on the syringe placement portion 34 in accordance with the outer cylinder flange 20 and the set groove 42.

  As shown in FIG. 7, the b operation is an operation of sliding the slider 60 to an appropriate position, setting the pusher flange 28 on the slider 60 by the lever 66, and fixing the slider 60. Strictly speaking, the b operation includes an operation for setting the pusher flange 28 on the slider 60 and two operations for fixing the slider 60. From the viewpoint of the operator, only the operation of the lock lever 70 is performed. It is appropriate to classify.

  As shown in FIG. 8, in the c operation, the clamp 50 is pulled up moderately, the rotation lever 54 is rotated 90 ° clockwise and then lowered, and the upper surface of the syringe outer cylinder 18 is pressed and fixed by the rotation lever 54. It is.

  In the computer 110, until the syringe is normally placed, a display to be described later is displayed on the liquid crystal monitor 102, and the backlight 142 of the liquid crystal monitor 102 is alternately blinked in red and white, and the corresponding clamp confirmation LED 58 and slider are displayed. The confirmation LED 72 is blinked and the buzzer 144 is intermittently sounded to prompt the operator to set the syringe 12. The backlight 142 has a psychological alerting effect on the operator by lighting or blinking in red. When the backlight 142 is of the red type, simple flashing may be performed.

  Next, a connection structure between the bellows cylinder 62 and the wall surface 36c of the main body in the pusher drive unit 36 will be described.

  As shown in FIGS. 3 and 9, the drive rod 63 extends from a round hole 200 provided in the wall surface 36 c and is connected to the slider 60. The bellows cylinder 62 provided in the pusher drive part 36 has a boot 202 and an annular projecting part 204 projecting in the inner diameter direction at the foremost part at the end in the X1 direction.

  The drive rod 63 is surrounded and protected by the bellows cylinder 62 between the wall surface 36 c of the main body and the slider 60. At the end of the bellows cylinder 62 in the X1 direction, the hollow ny latch 206 is pressed against the peripheral surface of the round hole 200 and fixed.

  As shown in FIGS. 9 and 10, the ny latch 206 is a fixture for attaching a predetermined member to the hole of the wall body, and is inserted into the grommet 208 inserted into the round hole 200 and the hollow portion of the grommet 208. And a hollow plunger 210 that is displaced in the axial direction.

  The grommet 208 has six snap fits 212 arranged in an annular shape, and a first flange 214 provided on the proximal end side. The outer diameter of the cylindrical portion formed by the six snap fits 212 is substantially equal to the diameter of the round hole 200, and the lumen surface 216 has a tapered shape that slightly narrows toward the inner diameter side toward the tip. Each snap fit 212 extends from the first flange 214 in the axial direction, and has a thick end portion 218 having a triangular cross section at the tip. The flat part 220 excluding the thick part 218 in the snap fit 212 is slightly shorter than the depth of the round hole 200.

  The first flange 214 has a proximal-side tapered surface 222 and a distal-end side stepped surface 224. The stepped surface 224 has an outer diameter substantially equal to the inner diameter of the annular protrusion 204 and an axial width slightly shorter than the width of the annular protrusion 204. The first flange 214 has a larger diameter than the round hole 200 and is substantially equal to the inner diameter of the boot 202. A low annular protrusion that elastically contacts the peripheral surface of the first flange 214 is provided in the inner cavity of the boot 202, and exhibits a sealing action.

  The plunger 210 includes a cylinder 232 that is inserted into the lumen of the grommet 208 and partially penetrates, and a second flange 234 that is provided on the proximal end side and has a larger diameter than the cylinder 232. The outer diameter of the tube 232 is slightly larger than the inner diameter of the lumen formed by the tip portions of the six snap fits 212. At the tip of the tube 232, a pair of minute projections 236 are provided at a symmetrical position as a snap-off prevention of the snap fit 212. A tapered surface 238 is provided on the tip side surface of the second flange 234.

  Next, the operation of removing the bellows cylinder 62 and the annular projecting portion 204 against the peripheral surface of the round hole 200 by the ny latch 206 configured as described above and the removal procedure will be described.

  As shown in FIG. 11, first, the plunger 210 is inserted into the grommet 208 halfway, and the boot 202 of the bellows cylinder 62 is put on the grommet 208 and the plunger 210. At this point, no external force acts on each snap fit 212, and the snap fit 212 can be elastically deformed inward and outward. The drive rod 63 is inserted through the inner cavity of the ny latch 206.

  Next, as shown in FIG. 12, the portion of the boot 202 is pinched and pushed so that the ny latch 206 is inserted into the round hole 200. Each snap fit 212 is elastically deformed inward when the thick portion 218 is pushed against the inner wall of the round hole 200.

  As shown in FIG. 13, when the ny latch 206 is further pushed in, the thick part 218 penetrates the round hole 200, and each snap fit 212 returns to the original state. In this state, the progress of the grommet 208 is once stopped.

  As shown in FIG. 9, when the plunger 210 is pushed in, it is further displaced in the axial direction, the tip of the tube 232 penetrates the plunger 210, and the protrusion 236 comes out before the snap fit 212 and becomes a stopper. Further, since the flanges 214 and 234 have tapered surfaces 222 and 238 on opposite sides, the tapered surfaces 222 and 238 form an annular groove 239 having a V-shaped cross section.

  At this time, each snap fit 212 is appropriately expanded and held by the cylinder 232 of the plunger 210 from the inner diameter side. Since the snap fit 212 is elastically pushed and spread, a force that pushes the inner peripheral edge of the round hole 200 in the axial direction is generated on the inclined surface on the proximal end side of the thick portion 218, and the annular protrusion 204 is connected to the first flange 214. It is appropriately compressed by the wall surface 36c and has a sealing action. The amount of compression of the annular protrusion 204 is moderately limited by the step surface 224.

  In this way, according to the ny latch 206, the snap fit 212 is slightly expanded outward and held, so that the thick end portion 218 can fix and prevent the round hole 200 from being secured. 11 to 12, 13, and 9 are illustrated and described separately for each minute time so as to facilitate understanding, but in actuality, the operations are instantaneously ended by a single pushing operation. The operation is simple.

  As shown in FIG. 14, when the bellows cylinder 62 is removed by pressing the annular protrusion 204 by the ny latch 206 against the peripheral surface of the round hole 200 and removing the bellows cylinder 62, the cross-section V-shaped formed by the tapered surfaces 222 and 238. The thin bar 240 is inserted into the annular groove 239 through the boot 202. As a result, the annular groove 239 receives a force that pushes it in the axial direction, and the minute protrusion 236 gets over the tip of the snap fit 212, the engagement state is released, and the bellows cylinder 62 is simply removed from the wall surface 36c of the main body. be able to. As shown in FIG. 15, the thin bar 240 is easy to operate if the tip is semicircular. The thin bar 240 is basically distributed to a specialized maintenance person, and the medical staff does not unnecessarily remove the bellows tube 62.

  As shown in FIG. 16, when the bellows cylinder 62 is removed from the wall surface 36c and contracted in the X2 direction, the stepped surface 36a and the wall surface 36b that are normally substantially hidden by the bellows cylinder 62 are exposed in the pusher driving unit 36, and maintenance is performed. The person in charge can easily clean this part.

  As described above, in the syringe pump 10 according to the present embodiment, the bellows tube 62 is removed from the outside of the main body as needed by fixing the bellows tube 62 to the round hole 200 of the main body by the ny latch 206. The side surface portion of the main body that is normally hidden by the bellows cylinder 62 can be easily cleaned. The nylatches 206 are structurally prevented from being removed inadvertently and maintain water resistance and reliability. By making the ny latch 206 into a hollow structure, the drive rod 63 can be inserted, which is preferable.

  Next, the setting dial 86 and its peripheral structure will be described in detail. As described above, the dial placement hole 91 (see FIG. 3) is provided with the vertically long notch portion 91a and the side surface recess portion 91b that expose the upper portion of the setting dial 86 on the upper surface. The side recess 91b has a shape that is recessed toward the outer diameter side and that opens to the side (X2 direction), and more specifically has a shape that expands toward the outer diameter side in the opening direction with a predetermined width.

  The dial arrangement hole 91 is slightly larger in diameter than the setting dial 86, and the gap is narrow. The depth of the dial arrangement hole 91 is substantially the same as the height of the setting dial 86, and the setting dial 86 hardly protrudes from the main body of the syringe pump 10. Such a configuration without useless protrusions and gaps is excellent in design, and prevents a finger from entering the gaps, and is excellent in operability. As described above, the liquid supply amount set by the setting dial 86 is the liquid supply amount per unit time, but may be an integrated total liquid supply amount depending on design conditions.

  As shown in FIG. 17, the setting dial 86 has donut-shaped magnets 300 having 16 (22.5 ° pitch) polarities at regular intervals and a bottomed hole 304 (see FIG. 19).

  As shown in FIGS. 17 and 18, the dial arrangement hole 91 has an embedded shaft 306 at the center position to be inserted into the bottomed hole 304, an iron plate 308 provided in a range of about 230 °, and an abbreviation of the iron plate 308. It has a pair of Hall ICs 310a and 310b provided on the opposite side. The Hall ICs 310a and 310b correspond to the dial rotation sensor 150 described above. The iron plate 308 and the Hall ICs 310a and 310b are covered with a thin resin cover 312 (see FIG. 17) to ensure water resistance, but the resin cover 312 is not shown in FIG. 18 for easy understanding. Yes.

  The iron plate 308 is radially provided with ten convex portions 308a having the same interval as the arrangement interval (22.5 °) of the magnet 300, and attracts the magnet 300 of the setting dial 86 so that the setting dial 86 falls off. Can be prevented, and an appropriate click feeling can be generated during rotation.

  The two Hall ICs 310a and 310b are provided at positions that are 90 ° out of phase with the arrangement interval of the magnets 300. As a result, when the setting dial 86 is rotated, the phase of the magnetic field change that occurs when the magnet 300 passes through the front is detected differently by 90 ° between the Hall IC 310a and the Hall IC 310b, and so-called A phase signal and B phase signal are generated. Can be made. The rotation amount of the setting dial 86 can be detected by using a predetermined counter circuit for the A phase signal and the B phase signal.

  Incidentally, as shown in FIG. 4, the syringe pump 10 is often used in a state where the syringe pump 10 is fixed to the mounting tool 402 of the infusion stand 400 and set obliquely. The operability of a standing medical worker is improved by setting with an appropriate inclination.

  In the mounting tool 402, the inclination angle of the syringe pump 10 can be arbitrarily adjusted. However, in the actual medical site, the inclination is approximately 60 ° as shown in FIG.

  As shown in FIG. 18, when the syringe pump 10 is tilted forward by 60 ° with respect to the vertical lower direction V, the range of the angular width of the side recess 91 b is set to a position including the direction of the vertical lower direction V. Specifically, the center of the angular width of the side recess 91b is directed in the vertical downward direction V. In other words, the side recess 91b is set to a position including a position of 60 ° forward with the axis of the setting dial 86 as the center and the vertically lower side in the horizontal surface mounted state as a reference. Thereby, it is easy to discharge the chemical solution or the like from the dial arrangement hole 91 in a general inclined use state.

  By setting the angle width W of the side recess 91b to 30 ° to 90 °, it is not unnecessarily wide and is sufficient for discharging a chemical solution or the like. Here, the angular width W is defined by the angles of both end portions of the side recess 91b.

  As shown in FIG. 19, the inclination θ2 of the side recess 91b is sufficient to discharge the chemical liquid or the like by setting it to 5 ° to 30 ° with respect to the axial direction of the setting dial. In addition, at such an angle, the side recess 91b does not become unnecessarily steep and the gap with the setting dial 86 does not become excessively wide.

  As described above, in the syringe pump 10 according to the present embodiment, by providing the side recess 91b in the dial arrangement hole 91, even when a chemical solution or the like enters the narrow gap between the setting dial 86 and the dial arrangement hole 91. The chemical liquid or the like is easily discharged from the side recess 91b, and does not accumulate and solidify at this portion, is difficult to get dirty, and is easy to clean. Since the chemical solution or the like does not solidify in the narrow gap between the setting dial 86 and the dial arrangement hole 91, the setting dial 86 rotates smoothly and can be easily removed during maintenance and cleaning.

  Of course, the syringe pump according to the present invention is not limited to the above-described embodiment, and various configurations can be adopted without departing from the gist of the present invention.

It is a perspective view of the syringe pump which concerns on this Embodiment before a syringe is mounted. It is a perspective view of the syringe pump which concerns on this Embodiment with which the syringe was mounted. It is the perspective view which looked at the syringe pump which concerns on this Embodiment from the back surface. It is a perspective view of the syringe pump set diagonally. It is a block block diagram of the syringe pump which concerns on this Embodiment. It is a figure which shows the mode of a operation which sets a syringe. It is a figure which shows the mode of b operation which sets a syringe. It is a figure which shows the mode of c operation which sets a syringe. FIG. 6 is a cross-sectional side view of a ny latch and a bellows cylinder fixed around a round hole by the ny latch. It is a disassembled perspective view of the wall surface provided with the round hole, a ny latch, and a bellows cylinder. It is a cross-sectional side view of the 1st step which fixes a bellows cylinder around a round hole with a ny latch. It is a cross-sectional side view of the 2nd step which fixes a bellows cylinder around a round hole with a ny latch. It is a cross-sectional side view of the 3rd step which fixes a bellows cylinder around a round hole by a ny latch. It is a cross-sectional side view which shows a mode that fixation with respect to the circumference | surroundings of the round hole of a bellows cylinder by a ny latch is cancelled | released. It is a perspective view of a thin stick. It is a partial rear view of the syringe pump in a state where the bellows cylinder that has been released is contracted. FIG. 6 is a perspective view of the dial arrangement hole and the setting dial in a state where the setting dial is removed from the dial arrangement hole. It is a front view of the dial arrangement | positioning hole which abbreviate | omitted the resin cover in the state which inclined the syringe pump by 60 degrees. It is a sectional side view of a dial arrangement hole and a setting dial in a state where the syringe pump is inclined by 60 °.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Syringe pump 12a, 12b ... Syringe 14 ... Syringe main body 16 ... Pusher 18 ... Syringe outer cylinder 20 ... Outer cylinder flange 28 ... Pusher flange 30 ... Rib 32 ... Operation part 34 ... Syringe mounting part 36 ... Pusher drive Part 36a ... Step surface 36b, 36c ... Wall 39 ... Power outlet 39a ... AC cable 40a, 40b ... Detection switch 42 ... Set groove 42a ... First groove wall 42b ... Second groove wall 44 ... Spring body 44d ... Projection 50 ... Clamp 54 ... Rotating lever 60 ... Slider 62 ... Bellows cylinder 63 ... Drive rod 64 ... Pusher detection switch 66 ... Lever 86 ... Setting dial 88 ... Setting liquid supply amount display part 91 ... Dial arrangement hole 91a ... Longitudinal notch 91b ... Side recess 102 ... LCD monitor 200 ... round hole 202 ... boot 204 ... annular protrusion 206 ... ny latch 208 ... grommet 210 ... plunger 212 ... snap fit 214, 234 ... flange 218 ... thick part 222,238 ... tapered surface 236 ... projection 239 ... annular groove 300 ... magnet 308 ... iron plates 310a, 310b ... Hall IC

Claims (8)

A housing that houses the actuator;
A syringe mounting portion provided in the housing and for mounting an outer cylinder of the syringe;
A slider for holding a syringe presser placed on the syringe placement part;
A drive rod driven by the actuator, extending from a hole in the housing, connected to the slider, and sliding the slider to move the pusher;
The drive rod is enclosed between the housing and the slider, and includes an annular projecting portion projecting in an inner diameter direction at an end portion on the housing side, and a telescopic bellows tube,
A ny latch that presses and fixes the annular protrusion against the peripheral surface of the hole;
A syringe pump characterized by comprising: The syringe pump according to claim 1, wherein
The ny latch includes a grommet having a plurality of snap fits, and a plunger that is inserted into the grommet and spreads the plurality of snap fits outward.
Each of the grommets and the plunger has a flange on the proximal end side, and when the plunger is inserted into the grommets, the flanges are adjacent to each other,
Each of the flanges has a tapered surface on the opposite side, and the two tapered surfaces form a V-shaped cross section. A housing that houses the actuator;
A syringe mounting portion provided in the housing and for mounting an outer cylinder of the syringe;
A slider for holding a syringe presser placed on the syringe placement part;
A rotary setting dial for setting the amount of liquid medicine delivered in the syringe;
A dial arrangement hole provided on a side surface of the housing, the setting dial being rotatably arranged, and exposing a side surface of the setting dial;
Have
The syringe pump according to claim 1, wherein a side surface recess is provided on a side surface of the dial arrangement hole. The syringe pump according to claim 3,
The syringe pump according to claim 1, wherein the side recess is a tapered portion having a predetermined width that extends toward the outer diameter side in the opening direction. The syringe pump according to claim 3 or 4,
The syringe pump according to claim 1, wherein an inclination of the side recess is 5 ° to 30 ° with respect to an axial direction of the setting dial. In the syringe pump according to any one of claims 3 to 5,
The syringe pump according to claim 1, wherein the side recess is set at a position including a vertically lower portion when tilted forward by 60 ° with respect to a vertically downward direction of the syringe pump. In the syringe pump according to any one of claims 3 to 5,
The syringe pump according to claim 1, wherein the side concave portion is set at a position including a position of 60 ° forward with respect to a vertical lower side in a horizontal surface mounted state with the axis of the setting dial as a center. In the syringe pump according to any one of claims 3 to 7,
The syringe pump, wherein the side recess has an angular width of 30 ° to 90 °.

Images