JP2016193041A - Liquid extraction device body and liquid extraction device - Google Patents

Abstract

A liquid dispensing apparatus main body and a liquid dispensing apparatus capable of being sterilized are provided. By driving a rotary actuator 31, a piston 33 is advanced and retracted in a cylindrical body 20 along the axial direction of the piston 33, and liquid is sucked and discharged through a syringe cartridge 100 attached to the distal end side. In the liquid dispensing apparatus main body 10, a gap between the outer peripheral surface of the piston 33 and the inner peripheral surface of the cylindrical body 20 is filled so that the piston 33 can advance and retreat, and gas flows from the outside to the rotary actuator 31 side through the gap. It is set as the structure provided with the seal | sticker part 60 which prevents this. [Selection] Figure 2

Description

  The present invention relates to a liquid dispensing apparatus main body and a liquid dispensing apparatus.

  2. Description of the Related Art Conventionally, a liquid dispensing apparatus including a liquid dispensing apparatus main body and a syringe cartridge attached to the distal end side of the liquid dispensing apparatus main body is known. This liquid dispenser main body reciprocates the piston in the cylinder along the axial direction of the piston by driving a rotary actuator (drive source) such as a motor, and sucks and pours liquid through the syringe cartridge on the distal end side. Configured to do out.

  On the other hand, the syringe cartridge has a syringe and a plunger, and the plunger advances and retreats with respect to the syringe by reciprocation (reciprocation) of the main body of the liquid dispensing apparatus, and the liquid is sucked into the syringe cartridge through the nozzle at the tip. Or the liquid in the syringe cartridge is poured out.

  As the cartridge-type liquid dispensing device described above, for example, in Patent Documents 1 and 2, there is a liquid dispensing device that controls the movement of the piston by controlling the driving of the drive motor to adjust the dispensing speed. It is disclosed.

JP 2006-230701 A JP 2004-130005 A

  By the way, depending on the type of liquid to be inhaled and dispensed, the above-described liquid dispensing apparatus sterilizes with sterilization gas or high-pressure steam (for example, about 120 ° C. for 1 minute) every time the liquid is inhaled and dispensed. May be required. In particular, in a type of liquid dispensing apparatus that is directly gripped by hand, it is possible that various types of contamination will be transmitted from the hand to the liquid dispensing apparatus main body when using the apparatus, and the liquid dispensing apparatus main body is sterilized in the same manner as the cartridge. It is desired to apply.

  As described above, when the liquid dispensing apparatus has a drive source such as a motor, if a sterilization gas or water vapor enters the drive source, it may cause malfunction or failure. For example, when sterilization is performed in the liquid dispensing devices described in Patent Documents 1 and 2, sterilization gas or water vapor enters from a gap between the piston and the cylinder. For this reason, there is a problem that even if only the cartridge can be sterilized, the liquid dispensing apparatus main body cannot be sterilized.

  This invention is made | formed in view of the above, Comprising: It aims at providing the liquid extraction apparatus main body and liquid extraction apparatus which can be sterilized.

  In order to solve the above-described problems and achieve the object, the liquid dispensing apparatus main body according to one aspect of the present invention causes the piston to advance and retract along the axial direction of the piston by driving the rotary actuator. A liquid dispensing apparatus main body for sucking and dispensing liquid via a syringe cartridge attached to the distal end side, wherein the piston is movable between an outer peripheral surface of the piston and an inner peripheral surface of the cylindrical body so that the piston can advance and retreat. A seal portion is provided to fill the gap and prevent gas from flowing into the rotary actuator through the gap from the outside.

  Moreover, the liquid extraction apparatus main body which concerns on 1 aspect of this invention WHEREIN: The said seal part is a piston seal, It is characterized by the above-mentioned.

  Moreover, the liquid extraction apparatus main body which concerns on 1 aspect of this invention is equipped with the magnet part which has the magnet attached to the front end side of the said piston, and the said syringe cartridge and the said piston are on one axis | shaft on this magnet part. The plunger is magnetically connected to the plunger of the syringe cartridge so as to be arranged, and the piston moves the plunger forward and backward with respect to the syringe cartridge via the magnet portion.

  In addition, the liquid dispensing apparatus main body according to one aspect of the present invention is formed so that the axial direction of the piston is a longitudinal direction and has a total length larger than the full width, and is close to the distal end side of the casing And a distal end side push button that constitutes an operation input unit for driving the rotary actuator, and the output shaft, the piston, and the plunger of the rotary actuator are arranged on one axis. It is characterized by that.

  In addition, the liquid dispensing apparatus main body according to one aspect of the present invention moves the piston back and forth in the cylinder along the axial direction of the piston by driving the rotary actuator, and moves the liquid through the syringe cartridge attached to the distal end side. A liquid dispensing apparatus main body for performing suction and dispensing, comprising a magnet portion having a magnet attached to the tip end side of the piston, wherein the syringe cartridge and the piston are arranged on one axis. As described above, the plunger is magnetically connected to the plunger of the syringe cartridge, and the piston advances and retracts the plunger with respect to the syringe cartridge via the magnet portion.

  In addition, a liquid dispensing apparatus according to an aspect of the present invention includes the above-described liquid dispensing apparatus main body and a syringe cartridge attached to the distal end side of the liquid dispensing apparatus main body.

  ADVANTAGE OF THE INVENTION According to this invention, the liquid extraction apparatus main body and liquid extraction apparatus which can be sterilized can be provided.

FIG. 1 is a perspective view showing a liquid dispensing apparatus according to an embodiment of the present invention. FIG. 2 is a schematic explanatory view showing a longitudinal section of the liquid dispensing apparatus according to the embodiment of the present invention. FIG. 3 is a perspective sectional view showing a longitudinal section of the liquid dispensing apparatus according to the embodiment of the present invention. FIG. 4 is a schematic explanatory view showing a longitudinal section of the liquid dispensing apparatus main body according to the embodiment of the present invention. FIG. 5 is a perspective sectional view showing a longitudinal section of the liquid dispensing apparatus main body according to the embodiment of the present invention. 6 is an enlarged view of a main part of the liquid dispensing apparatus shown in FIG.

  Exemplary embodiments of a liquid extraction apparatus body and a liquid extraction apparatus according to the present invention will be described below in detail with reference to the accompanying drawings. In addition, this invention is not limited by the following embodiment. In the drawings, the same or corresponding elements are denoted by the same reference numerals as appropriate, and repeated descriptions are omitted as appropriate.

FIG. 1 is a perspective view showing a liquid dispensing apparatus 1 according to an embodiment of the present invention. This FIG. 1 has shown the case where the liquid extraction apparatus 1 is seen from the front end side.
The liquid pouring device 1 exemplified here includes a liquid pouring device main body 10, and a syringe cartridge 100 and a nozzle 110 attached to the distal end side of the liquid pouring device main body 10. The liquid dispensing apparatus 1 is for inhaling or dispensing a liquid such as a chemical solution, a reagent, or a specimen, for example. The liquid dispensing apparatus 1 has a cartridge type on the tip side, and the syringe cartridge 100 can be replaced.

  FIG. 2 is a schematic explanatory view showing a longitudinal section of the liquid dispensing apparatus 1 according to the embodiment of the present invention. FIG. 3 is a perspective sectional view showing a longitudinal section of the liquid dispensing apparatus 1 according to the embodiment of the present invention. First, the syringe cartridge 100 with which the liquid extraction apparatus 1 which is embodiment of this invention is provided is demonstrated.

  The syringe cartridge 100 includes a syringe 101 and a plunger 102 inserted from the base end side (right side in FIG. 2) of the syringe 101, and can enclose a liquid therein.

Syringe 101 is formed in a cylindrical shape, and a distal end side (left side in FIG. 2) of syringe 101 is closed and a small-diameter channel 103 through which liquid passes is formed. In the present embodiment, a removable nozzle 110 (injection needle) is provided at the tip of the syringe cartridge 100.
On the other hand, the proximal end side of the syringe 101 is closed by the plunger 102. At the rear end portion of the syringe 101, a convex portion 104 that fits into a later-described syringe cartridge holding portion 25 is formed.

  The plunger 102 has a cylindrical shape. The rear end portion of the plunger 102 has a plunger attachment portion 102a attached to a magnet portion 50 described later. The plunger mounting portion 102a is made of a metal material that can be attracted to the magnet. The outer diameter of the plunger 102 is set slightly smaller than the inner diameter of the syringe 101. The plunger 102 has a rubber portion 102b that is in close contact with the syringe 101 in the radial direction, and the proximal end side of the syringe 101 is closed by the rubber portion 102b. The plunger 102 advances and retreats in the syringe 101, whereby the liquid can be sucked into the syringe 101 and the liquid in the syringe 101 can be poured out through the nozzle 110.

FIG. 4 is a schematic explanatory view showing a longitudinal section of the liquid dispensing apparatus main body 10 according to the embodiment of the present invention. FIG. 5 is a perspective sectional view showing a longitudinal section of the liquid dispensing apparatus body 10 according to the embodiment of the present invention.
The liquid dispensing apparatus main body 10 includes a housing 11 having an accommodation space inside. The housing 11 has a housing space formed therein by connecting a pair of left and right side covers 11L and 11R. Each of the side covers 11L and 11R has a long shape whose longitudinal direction is the longitudinal direction, whereby the entire length of the casing 11 is larger than the full width. In the present embodiment, the housing 11 has a seal structure that prevents gas from entering from the outside.

In the housing 11, a cylindrical body 20, a syringe cartridge holding unit 25, an actuator unit 30, and an operation input unit (operation input unit) 40 are provided.
The cylindrical body 20 extends in the longitudinal direction of the housing 11. A piston 33, a magnet unit 50, and a plunger 102, which will be described later, are disposed inside the cylindrical body 20. Within the cylinder 20, the piston 33, the magnet unit 50, and the plunger 102 can advance and retreat (reciprocate).

  The syringe cartridge holding part 25 has a cylindrical shape, the distal end side (left side in FIGS. 2 and 4) of the syringe cartridge holding part 25 is connected to the distal end part of the housing 11, and the proximal end side of the syringe cartridge holding part 25 is a cylindrical body. 20 is provided continuously on the tip side. The syringe cartridge holding part 25 holds the outer peripheral side surface of the syringe cartridge 100 (syringe 101), and a concave part 26 formed on the proximal end side of the syringe cartridge holding part 25 is fitted to the convex part 104 of the syringe 101. Thereby, the syringe cartridge holding part 25 holds the syringe cartridge 100 and regulates the movement of the syringe cartridge 100.

  In this embodiment, the clearance gap between the housing | casing 11 and the syringe cartridge holding | maintenance part 25 and the syringe cartridge holding | maintenance part 25 and the cylinder 20 is made into the seal structure which prevents invasion of gas. That is, invasion of gas from the outside of the housing 11 and invasion of gas from the gap between the housing 11 and the syringe cartridge holding unit 25 and between the syringe cartridge holding unit 25 and the cylinder 20 are prevented.

  The actuator unit 30 includes a rotary actuator 31, an output shaft 32, and a piston 33. The rotary actuator 31 includes an electric motor 311 and a speed reducer 312. The electric motor 311 serves as a drive source for the rotary actuator 31, and includes power supplied from a battery (not shown) housed on the proximal end side of the housing space of the housing 11, and a command given from a control circuit described later. It is driven by. The electric motor 311 can arbitrarily change the rotation direction according to the energization direction.

  The actuator case 35 has a substantially cylindrical shape, and has a sufficient extension length to cover the outer peripheral area of the drive shaft portion 312a constituting the tip portion of the speed reducer 312. The actuator case 35 covers the outer periphery of the speed reducer 312 so that the center axis of the actuator case 35 coincides with the center axis of the drive shaft 312a.

  The output shaft 32 has a columnar output base 321 having a thread groove on the outer peripheral surface, and an output base end 322 provided in a manner continuous with the base end of the output base 321. The output base end portion 322 has a diameter larger than that of the output base portion 321, and an output concave portion 323 is formed by partially branching the output base end portion 322 into a bifurcated shape so that surfaces facing each other are flat.

  The piston 33 has a substantially cylindrical shape with a closed end, and the outer diameter of the piston 33 is slightly smaller than the inner diameter of the cylindrical body 20. Further, the inner diameter of the piston 33 is slightly larger than the outer diameter of the output shaft 32, that is, the outer diameter of the output base portion 321 of the output shaft 32. Further, the piston 33 is constantly biased toward the base end side by a biasing means such as a spring (not shown).

  A nut 33 a is attached to the base end portion of the piston 33. The nut 33a is made of a resin material or the like. The nut 33 a has a thread groove formed on the inner peripheral surface, and is disposed on the output shaft 32 in a state where the thread groove is screwed into the thread groove of the output shaft 32. A projecting piece 33b extending outward in the radial direction is formed on the outer periphery of the nut 33a.

  And the seal part 60 is provided between the piston 33 and the cylinder 20 (refer FIG. 6). The seal portion 60 fills a gap between the outer peripheral surface of the piston 33 and the inner peripheral surface of the cylindrical body 20 so that the piston 33 can advance and retreat, and prevents gas from flowing into the rotary actuator 31 from the outside through the gap. Is for. In the present embodiment, the seal portion 60 is disposed along the circumferential direction between the concave portion 33 c formed at the tip of the piston 33 and the cylindrical body 20. The space between the piston 33 is closed.

  In the present embodiment, specifically, the seal portion 60 is a ring-shaped piston seal. The seal portion 60 is provided so as to be slidable even when the piston 33 advances and retreats in the cylindrical body 20, and can maintain the blockage between the cylindrical body 20 and the piston 33.

  In addition, in this embodiment, although the case where the seal part 60 is provided in the front-end | tip part of piston 33 is illustrated, the seal part 60 is provided in the center part of the longitudinal direction of piston 33, or a base end part side. May be. That is, it is only necessary that the seal portion 60 is provided so as to prevent the gas from flowing into the rotary actuator 31 from the cylindrical body 20. Further, in the present embodiment, the case where only one seal part 60 is provided is illustrated, but the seal part 60 may be provided at a plurality of places.

  The operation input unit 40 is for an operator (user) to perform an operation input. In the present embodiment, the operation input unit 40 includes a distal end side push button 41 including a first push button 41a and a second push button 41b. Yes.

  The distal end side push button 41 (the first push button 41 a and the second push button 41 b) is provided at a location close to the distal end side of the housing 11, and the top portion is exposed from the housing 11. The front end side push button 41 turns on a switch attached to one surface (the upper surface in FIG. 2) of the substrate 44 (circuit substrate) when pressed. In the present embodiment, for example, the first push button 41a is an operation button for dispensing liquid, and the second push button 41b is an operation button for inhaling liquid.

  An origin detection sensor 45 for detecting whether or not the piston 33 is located at the standby position is provided on the other surface of the substrate 44. The substrate 44 is housed in the housing space of the housing 11 and is mounted with a control circuit (not shown) that controls the operation of the liquid dispensing apparatus 1.

  And the liquid extraction apparatus 1 of this embodiment is provided with the magnet part 50 between the front end side of the piston 33 of the liquid extraction apparatus main body 10, and the rear end side of the plunger 102 of the syringe cartridge 100 (FIG. 6). The magnet portion 50 is fixed to the tip of the piston 33 with a screw 51 and is magnetically connected to the plunger mounting portion 102 a of the plunger 102. The plunger mounting portion 102 a made of a metal material and the magnet portion 50 are firmly fixed by a magnetic force, and the plunger 102 can advance and retreat with respect to the syringe 101 via the magnet portion 50 in accordance with the advance and retreat of the piston 33.

  In the liquid dispensing apparatus 1 configured as described above, the piston 33 of the actuator unit 30 is located at the reference position in the initial state when the power is turned on, and the protruding piece 33b of the nut 33a is illustrated in FIG. It is located in the detectable region of the origin detection sensor 45 that is on the tip side of the position.

  When the second push button 42 is pressed with the piston 33 positioned at the reference position in this way, the control circuit gives a drive command to the electric motor 311 to drive the electric motor 311. Here, the time for which the control circuit drives the electric motor 311 is a time sufficient to suck a preset amount.

  When the electric motor 311 is driven in this way, the output shaft 32 rotates about its own axis. When the output shaft 32 rotates with respect to the actuator case 35, the piston 33 provided with a nut 33a that is screwed to the actuator shaft 35 receives the urging force of the urging means and moves toward the proximal end along the axial direction of the output shaft 32. Move linearly toward. When the piston 33 moves linearly toward the base end side, the plunger 102 also moves toward the base end side via the magnet unit 50, and the internal space 101a of the syringe 101 becomes negative pressure, so that the nozzle 110 Liquid is inhaled from the tip.

When the driving of the electric motor 311 by the control circuit is stopped, the piston 33 is located at the advanced position moved to the most proximal side.
Next, when the first push button 41 a is pressed, the control circuit gives a drive command to the electric motor 311 to drive the electric motor 311. When the first push button 41a is pressed and liquid is dispensed, the energization direction is set such that the rotating shaft of the electric motor 311 is rotated to the opposite side to that during suction. Further, the time for which the control circuit drives the electric motor 311 is a time sufficient to dispense a preset amount by being input through the first push button 41a.

  When the electric motor 311 is driven as described above, the rotational force appropriately reduced by the reduction gear 312 is transmitted to the output shaft 32, and the output shaft 32 rotates around its own axis with respect to the actuator case 35 (cylindrical body 20). Rotate to. When the output shaft 32 rotates with respect to the actuator case 35, the piston 33 provided with a nut 33a screwed to the actuator case 35 resists the urging force of the urging means toward the distal end side along the axial direction of the output shaft 32. It moves linearly by a predetermined amount. As the piston 33 moves linearly toward the distal end side, the plunger 102 also moves linearly, and a part (predetermined amount) of the liquid sucked into the syringe cartridge 100 is dispensed (dispensed). .

  Each time the first push button 41a is pressed, the liquid dispensing apparatus 1 linearly moves the piston 33 toward the tip side by a predetermined amount to dispense a predetermined amount of liquid, thereby forming the piston 33. When the protruding piece 33b of the nut 33a is positioned in the detectable region of the origin detection sensor 45 and the piston 33 is positioned at the reference position, the current dispensing operation is terminated.

  In the liquid dispensing apparatus 1, not only the sterilization process of the syringe cartridge 100 but also the liquid dispensing apparatus main body 10 may require a sterilization process (sterilization gas treatment, high-pressure steam treatment, etc.). As described above, the liquid pouring device body 10 fills a gap between the outer peripheral surface of the piston 33 and the inner peripheral surface of the cylindrical body 20 so that the piston 33 can advance and retreat, and gas flows from the outside to the rotary actuator 31 side through the gap. The seal part 60 which prevents inflow is provided. That is, in the liquid dispensing apparatus main body 10, gas can be prevented from entering from the attachment position of the syringe cartridge 100 to the rotary actuator side by the seal portion 60, and the liquid dispensing apparatus main body 10 can be sterilized. Yes.

  In the present embodiment, since the seal portion 60 is a piston seal, the gap between the outer peripheral surface of the piston 33 and the inner peripheral surface of the cylinder 20 is such that the piston 33 can advance and retreat in the cylinder 20. Can be filled reliably.

  Moreover, since the liquid extraction apparatus main body 10 has the magnet part 50 attached to the front-end | tip of a piston, the piston 33 and the plunger 102 of the syringe cartridge 100 can be easily attached or detached using a magnetic force. it can.

  Since the piston 33 and the plunger 102 are fixed by the magnet unit 50 as described above, it is not necessary to fix the piston 33 and the plunger 102 by a complicated mechanism, so that the configuration of the liquid dispensing apparatus main body 10 can be simplified. The length of the liquid dispensing apparatus main body 10 in the longitudinal direction can be shortened. Thereby, in the liquid dispensing apparatus 1, even if the rotary actuator 31, the piston 33, and the plunger 102 are arranged on one axis, the apparatus does not become excessively long in the longitudinal direction, and thus a small apparatus is realized. it can. For example, by shortening the length of the liquid pouring device 1 in the longitudinal direction, the operator grips the gripping device in such a manner that the tip side push button 41 is pressed with an index finger, that is, a gripping method that grips a pen. It is possible to easily realize a liquid dispensing device that can perform the above-described operation.

  Note that the present invention is not limited to the above embodiment. What was comprised combining each component mentioned above suitably is also contained in this invention. Further effects and modifications can be easily derived by those skilled in the art. Therefore, the broader aspect of the present invention is not limited to the above-described embodiment, and various modifications can be made.

  For example, in the above-described embodiment, the case where the liquid dispensing apparatus main body 10 includes the seal portion 60 has been described. However, when the sterilization process is not necessary, the seal portion 60 may not be included.

  Moreover, although the liquid extraction apparatus main body 10 demonstrated the case where it had the magnet part 50 in the above-mentioned embodiment, it does not need to have the magnet part 50. FIG. In this case, for example, a configuration may be adopted in which the piston and the plunger are connected by another lock mechanism such as fitting.

  In the above-described embodiment, the case where the nozzle 110 is detachable from the syringe cartridge 100 in the liquid dispensing apparatus 1 has been described. However, the nozzle 110 and the syringe cartridge 100 may be integrated. good.

  In the above-described embodiment, the battery is the power source. However, a battery other than the battery may be mounted as the power source.

DESCRIPTION OF SYMBOLS 1 Liquid extraction apparatus 10 Liquid extraction apparatus main body 11 Housing | casing 11L Side cover 11R Side cover 20 Cylindrical body 25 Syringe cartridge holding | maintenance part 30 Actuator unit 31 Rotation actuator 311 Electric motor 312 Decelerator 312a Drive shaft part 32 Output shaft 321 Output base part 322 Output base end part 323 Output concave part 33 Piston 33a Nut 33b Projection piece 33c Concave part 35 Actuator case 40 Operation input unit 41 Front end side push button 41a First push button 41b Second push button 44 Board (circuit board)
50 Magnet part 51 Screw 60 Seal part 100 Syringe cartridge 101 Syringe 102 Plunger 102a Plunger mounting part 102b Rubber part 103 Flow path 104 Convex part 110 Nozzle

Claims (6)

A liquid dispensing apparatus main body that advances and retracts a piston along the axial direction of the piston by driving a rotary actuator, and sucks and dispenses liquid through a syringe cartridge attached to the distal end side,
Provided with a seal portion that fills a gap between the outer peripheral surface of the piston and the inner peripheral surface of the cylinder so that the piston can advance and retreat, and prevents gas from flowing from the outside to the rotary actuator side through the gap. A liquid dispenser body characterized by   The liquid dispensing apparatus main body according to claim 1, wherein the seal portion is a piston seal. A magnet portion having a magnet attached to the tip side of the piston;
The magnet portion is magnetically connected to a plunger of the syringe cartridge so that the syringe cartridge and the piston are arranged on one axis.
The liquid ejecting apparatus main body according to claim 1, wherein the piston moves the plunger forward and backward with respect to the syringe cartridge via the magnet unit. A casing formed such that the axial direction of the piston is the longitudinal direction, and the total length is larger than the full width,
A tip-side push button disposed at a location close to the tip side of the housing and constituting an operation input unit for driving the rotary actuator;
4. The liquid dispensing apparatus main body according to claim 1, wherein an output shaft of the rotary actuator, the piston, and the plunger are arranged on one axis. 5. A liquid dispensing apparatus main body that advances and retracts a piston along the axial direction of the piston by driving a rotary actuator, and sucks and dispenses liquid through a syringe cartridge attached to the distal end side,
A magnet portion having a magnet attached to the tip side of the piston;
The magnet portion is magnetically connected to a plunger of the syringe cartridge so that the syringe cartridge and the piston are arranged on one axis.
The piston is configured to move the plunger forward and backward with respect to the syringe cartridge through the magnet portion.   A liquid dispensing apparatus comprising: the liquid dispensing apparatus main body according to any one of claims 1 to 5; and a syringe cartridge attached to a distal end side of the liquid dispensing apparatus main body.

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