JP2013094376A - Syringe pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a syringe pump that prevents deformation of a feed screw, a pipe, and a case, even when a tube connected to a syringe is blocked, in order to prevent deterioration in accuracy of pushing-in of a syringe plunger and disengagement between a half nut member and the feed screw.SOLUTION: A syringe plunger driving unit 7 of the syringe pump 1 includes: a feed screw 135; a syringe plunger pressing member 10 abutting against a syringe plunger and moved along the feed screw by rotation of the feed screw 135 in order to push the syringe plunger 202 to the syringe body 201 side; a half nut member 750 having a female threaded portion 760 engageably/disengageably engaged with a male threaded portion 710 of the feed screw; and a pipe member 741 for covering the feed screw 135 and connects the syringe plunger pressing member 10 and the half nut member 750 to each other. The feed screw 135 and the pipe member 741 are made coaxial.

Description

  The present invention relates to a syringe pump for mounting a syringe and feeding a drug solution in the syringe to a patient.

Syringe pumps are used, for example, in intensive care units (ICU), etc., and perform high-accuracy treatments for feeding medical solutions such as anticancer agents, anesthetics, chemotherapeutic agents, blood transfusions, and other nutrients to patients. It is used for a relatively long time. The syringe liquid flow rate control is precise and superior compared to other infusion pumps.
That is, the syringe main body filled with the chemical solution is set so as not to move with respect to the syringe pump casing by using the clamp with respect to the syringe pump, and the syringe pump presses the syringe pusher and the chemical solution in the syringe main body. Is delivered accurately to the patient.

In a treatment room or an operating room using a syringe pump, a plurality of types of syringes having different accommodation amounts are prepared in advance. A medical worker selects a required amount of syringe from these syringes, and attaches the selected amount of syringe to the above-described syringe pump.
When the syringe is mounted on the syringe pump, the outer peripheral surface of the syringe main body is brought into close contact with the inner surface of the concave portion of the syringe pump, and the main body flange of the syringe is fitted to the fitting portion of the syringe pump. Can be gripped. And by driving the motor, the syringe pusher pressing member pushes the pusher flange of the syringe pusher toward the syringe body little by little, so that the drug solution in the syringe body can be sent to the patient through the tube. (See Patent Document 1).

JP 2010-88564 A

  By the way, the case of the syringe pump normally used has a guide bar, a feed screw, a pipe, a half nut member, and a motor. The guide bar, the feed screw, and the pipe are attached in parallel to each other in the case. The feed screw and the female screw portion of the half nut member are engaged with each other. The half nut member is fixed to the end of the pipe. When the motor is driven, the feed screw rotates to feed the half nut member, so that the half nut member can be guided in the linear direction by the guide bar. However, since the center axis of the lead screw and the center axis of the pipe are arranged apart from each other in parallel, there are the following problems.

If a syringe is attached to a syringe pump that is normally used and a clogging phenomenon occurs inside the tube connected to the syringe, the drug solution will not pass through the tube. The drive unit cannot push the pusher of the syringe. Then, the motor further rotates the feed screw.
However, as described above, the feed screw and the pipe are not coaxially arranged, and the feed screw and the pipe are in a parallel state and are spaced apart from each other. For this reason, when the feed screw tries to feed the half nut member, a moment is generated between the feed screw and the pipe fixed to the half nut member, and the feed screw, pipe, or case is deformed. End up.
When the feed screw, the pipe, and the case are deformed in this way, the feed screw has a sawtooth shape, and the meshing state between the half nut member and the feed screw is deteriorated. For this reason, there is a risk that the accuracy of pushing the pusher of the syringe will decrease, or the engagement between the half nut member and the feed screw may be disengaged. There is a risk that it will not be possible to pump the solution.
Therefore, the present invention prevents the lead screw, the pipe and the case from being deformed even when the tube connected to the syringe is blocked, and the accuracy of pushing the syringe pusher is reduced. An object of the present invention is to provide a syringe pump that can prevent the half nut member and the feed screw from being disengaged.

The syringe pump of the present invention is a syringe pump that attaches a syringe and sends the drug solution to a patient, the syringe mounting unit that sets the syringe body of the syringe, and the syringe mounting unit that is set to the syringe mounting unit A syringe pusher drive unit that pushes the syringe pusher of the syringe body to push out the chemical solution in the syringe body, and the syringe pusher drive unit includes a case and a feed screw that is rotatably arranged in the case. A syringe pusher pressing member for pushing the syringe pusher to the syringe body side by being abutted against the syringe pusher and moving along the feed screw by rotation of the feed screw; and A half nut member having a female screw portion that engages and disengages with the male screw portion; covers the feed screw; and It includes a pipe member which connects the nut member, the pipe member and the feed screw, characterized in that it is coaxially.
According to the above configuration, even when the tube connected to the syringe is blocked, the lead screw, the pipe and the case are prevented from being deformed, and the accuracy of pushing the syringe pusher is lowered. Or the engagement between the half nut member and the feed screw can be prevented. That is, since the lead screw and the pipe member are coaxial, the tube connected to the syringe is blocked as compared with the case where the lead screw and the pipe member are separately arranged in parallel. However, there is no moment and prevents the lead screw, pipe and case from being deformed, the accuracy of pushing the syringe pusher is reduced, and the half nut member and the lead screw are disengaged. Can be prevented.

Preferably, the pipe member is an inner pipe member that covers the feed screw, and further covers a cover member that holds the half nut member, the inner pipe member, and the cover member and the syringe pusher pressing member. And the feed screw, the inner pipe member, and the outer pipe member are coaxial.
According to the above configuration, since the feed screw, the inner pipe member, and the outer pipe member are coaxial, the outer pipe member protects the inner pipe member and the feed screw, and against the inner pipe member and the feed screw. The chemical solution can be prevented from adhering.

Preferably, the syringe pusher pressing member has a release operation portion, one end portion of the inner pipe member is connected to the release operation portion, and the other end portion of the inner pipe member is connected to the release operation portion. When the is operated, a clutch member is provided for rotating the half nut member to separate the female screw portion of the half nut member from the male screw portion of the feed screw.
According to the above configuration, when the release member is manually operated to move the clutch member, the female screw portion of the half nut member can be separated from the male screw portion of the feed screw. The syringe pusher pressing member can be manually abutted against the syringe pusher when the is attached.

Preferably, the motor has a motor that rotationally drives the feed screw, and a gear fixed to the output shaft of the motor and a gear fixed to the feed screw are engaged with each other.
According to the above configuration, the syringe pusher can be pushed toward the syringe body by the syringe pusher pressing member by driving the motor.

Preferably, the syringe mounting portion includes a main body flange pressing member that detachably holds and presses the main body flange of the syringe main body.
According to the above configuration, the main body flange of the syringe main body can be sandwiched and pressed by the main body flange pressing member, and the syringe main body can be securely held against the syringe mounting portion. It can abut against the member accurately.

Preferably, a display unit for displaying information and an operation panel unit having operation buttons are disposed on the upper part of the syringe pump main body, and the syringe mounting unit is disposed on the lower part of the syringe pump main body. The syringe pusher drive unit is arranged.
According to the said structure, the medical worker can perform the liquid feeding operation | movement of the chemical | medical solution from a syringe, confirming the information of the display part of the upper part of a main body. Then, the medical worker can operate the operation buttons on the operation panel unit while confirming the information on the display unit on the upper part of the main body.

  The present invention prevents the lead screw and the pipe and the case from being deformed even when the tube connected to the syringe is blocked, and the accuracy of pushing the syringe pusher is reduced, It is possible to provide a syringe pump that can prevent the engagement between the half nut member and the feed screw from being removed.

The perspective view which shows embodiment of the syringe pump of this invention. The perspective view which looked at the syringe pump shown in FIG. 1 from the W direction. The perspective view which shows the example of the syringe of several types of magnitude | sizes. The figure which shows the electrical structural example in a syringe pump. The perspective view which shows a part of syringe mounting part and syringe pusher drive part which are shown in FIG. FIG. 6 is a perspective view of a part of the syringe placement unit and the syringe pusher driving unit shown in FIG. 7A is a perspective view showing an example of the shape of the main body flange pressing member shown in FIGS. 5 and 6, and FIG. 7B is this main body flange pressing member viewed from the line JJ in FIG. 6. The figure which shows the state currently fixed. The figure which shows the state by which the main body flange of the syringe with comparatively large accommodation amount was engage | inserted and hold | gripped using the main body flange pressing member. The disassembled perspective view seen from the rear side which shows a front cover, a syringe pusher drive part, a main body flange pressing member, a syringe pusher pressing member, and a cover member. The figure which shows the structural example of the syringe pusher drive part shown in FIG. 9, and shows the cross section in the ES-ES line of the syringe pusher drive part of FIG. The perspective view which has a cross section which shows the structural example of the drive part main body of a syringe pusher drive part. The perspective view which shows the structural example of the press operation part of a syringe presser pressing member and a syringe presser pressing member. The figure which shows the perspective view which shows the structural example of the press operation part of a syringe pusher pressing member. The perspective view which shows the structure of the syringe pusher drive part of the syringe pump which is a comparative example.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.
The embodiments described below are preferred specific examples of the present invention, and thus various technically preferable limitations are given. However, the scope of the present invention is particularly limited in the following description. Unless otherwise stated, the present invention is not limited to these embodiments.
FIG. 1 is a perspective view showing an embodiment of the syringe pump of the present invention. FIG. 2 is a perspective view of the syringe pump shown in FIG. 1 as viewed from the W direction.
A syringe pump 1 shown in FIGS. 1 and 2 is used, for example, in an intensive care unit or the like, and a microinjection treatment of a medical solution such as an anticancer agent, an anesthetic agent, a chemotherapeutic agent, a blood transfusion, or the like for a patient. Is a micro continuous infusion pump that is used for performing a long period of time with high accuracy.

As shown in FIGS. 1 and 2, the syringe pump 1 can be set so that the syringe body 201 of the syringe 200 filled with, for example, a chemical solution does not move using the clamp 5. The motor 133 of the syringe pusher drive unit 7 shown in FIG. 2 rotates a feed screw (not shown in FIG. 2), so that the syringe pusher pressing member 10 of the syringe pusher drive unit 7 The child 202 is pressed against the syringe body 201 in the T direction, and the liquid medicine in the syringe body 201 is accurately fed to the patient P via the tube 203 and the indwelling needle 204 as shown in FIG. . The syringe pusher pressing member 10 is also referred to as a slider or a syringe pusher pressing unit.
As shown in FIG. 2, the syringe pump 1 has a housing 2, and this housing 2 is integrally formed of a molded resin material having chemical resistance, and is assembled by joining the front cover 2 </ b> F and the rear cover 2 </ b> R. By this, it is comprised as a box which has liquid-tight performance. Thereby, as will be described later, even if a chemical solution or moisture is applied, it has a splash-proof and drip-proof (waterproof) treatment structure that can prevent the syringe pump 1 from entering the inside.

First, each element arrange | positioned at the housing | casing 2 of the syringe pump 1 is demonstrated.
As shown in FIG. 2, the syringe pump 1 has a housing 2 and a handle 2T. A display unit 3 and an operation panel unit 4 are disposed on the upper portion 2A of the housing 2. A syringe placement unit 6 and a syringe pusher drive unit 7 are disposed in the lower portion 2B of the housing 2. Thereby, the medical worker can perform the liquid feeding operation from the syringe 200 while visually confirming the information content displayed in color on the display unit 3 of the upper portion 2A of the housing 2. Then, the medical staff can operate the operation buttons on the operation panel unit 4 while confirming the information content displayed in color on the display unit 3 of the housing 2.

  The display unit 3 shown in FIGS. 1 and 2 is a color liquid crystal display (LCD) capable of color graphic display. The display unit 3 is located at the upper left position of the upper portion 2 </ b> A of the housing 2, and is disposed above the syringe mounting unit 6 and the syringe pusher driving unit 7. The operation panel unit 4 is disposed on the right side of the display unit 3 in the upper portion 2A of the housing 2. The operation panel unit 4 includes operation buttons such as a pilot lamp 4A, a fast-forward switch button 4B, and a start switch in the illustrated example. A button 4C, a stop switch button 4D, a menu selection button 4E, and the like are arranged.

The upper part 2A of the housing 2 shown in FIG. The lower portion 2B of the housing 2 is a lower half portion of the housing 2.
In the example shown in FIGS. 1 and 2, the syringe placing unit 6 and the syringe pusher driving unit 7 are arranged side by side along the X direction. The syringe mounting unit 6 can be mounted by selecting, for example, a required amount of syringe 200 from among a plurality of types of syringes having different amounts of storage, so as to be detachable.

  1 and FIG. 2 includes a housing portion 8 that houses a syringe body 201, a clamp 5, and a body flange pressing member 500 for fitting and gripping the body flange 209 of the syringe 200. ing. The accommodating part 8 has a concave syringe body holding part 8D. A tube fixing portion 9 for detachably sandwiching the tube 203 is formed in the wall portion at the left end of the housing portion 8. The tube fixing portion 9 is a groove portion that sandwiches and fixes a portion of the tube 203 as shown in FIG.

1 and 2, when a medical worker operates the clamp 5 and removes the syringe 200 from the syringe mounting portion 6, for example, the clamp 5 is against the force of a spring (not shown) in the Y1 direction (frontward direction). ) And by turning 90 degrees in the R1 direction, the clamp 5 moves away from the outer peripheral surface of the syringe body 201. As a result, the syringe body 201 can be released from the syringe body holding portion 8D of the housing portion 8 and the tube 203 can be removed from the tube fixing portion 9 by releasing the fixation by the clamp 5.
Also, when the clamp 5 is operated and the syringe 200 is accommodated and attached in the accommodating portion 8 of the syringe placing portion 6, the clamp 5 is pulled in the Y1 direction against the force of a spring (not shown) and moved in the R2 direction. By turning 90 degrees and returning to the Y2 direction by the force of the spring, the syringe body 201 is housed in the syringe body holding portion 8D of the housing portion 8 and the tube 203 is fitted in the tube fixing portion 9, It can be fixed by the clamp 5.

  As shown in FIGS. 1 and 2, when the syringe main body 201 is accommodated and mounted in the syringe main body holding portion 8 </ b> D of the accommodating portion 8, the syringe pusher 202 is disposed in the syringe pusher driving portion 7. The syringe pusher drive unit 7 includes a syringe pusher pressing member 10. When the motor 133 is driven by a command from the controller, the syringe pusher pressing member 10 pushes the pusher flange 205 of the syringe pusher 202 little by little along the T direction relative to the syringe body 201. Thereby, the chemical | medical solution in the syringe main body 201 can be sent with high precision over the comparatively long time with respect to the patient P through the tube 203 and the indwelling needle 204. FIG. Note that the X direction, the Y direction, and the Z direction in FIGS. 1 and 2 are orthogonal to each other, and the Z direction is the vertical direction.

FIG. 3 is a perspective view showing an example of the above-described multiple types of syringes.
1 and 2 show an example in which a syringe 200 having the largest amount of medicinal solution is fixed. The syringe 200 having the largest chemical solution capacity shown in FIG. 3A has a syringe body 201 and a syringe pusher 202, the syringe body 201 has a body flange 209, and the syringe pusher 202 is pushed. A child flange 205 is provided. The syringe body 201 has a medicinal liquid scale 210. One end of a flexible tube 203 is detachably connected to the outlet 211 of the syringe body 201.

A syringe 300 having a medium amount of chemical solution shown in FIG. 3B has a syringe body 301 and a syringe pusher 302, the syringe body 301 has a body flange 309, and the syringe pusher 302 is A pusher flange 305 is provided. The syringe main body 301 is formed with a scale 310 of a chemical solution. One end of a flexible tube 203 is detachably connected to the outlet 311 of the syringe body 301.
The syringe 400 with the smallest amount of chemical solution shown in FIG. 3C has a syringe body 401 and a syringe pusher 402, the syringe body 401 has a body flange 409, and the syringe pusher 402 has a pusher. A child flange 405 is provided. The syringe body 401 is formed with a medicinal scale 410. One end of a flexible tube 203 is detachably connected to the outlet 411 of the syringe body 401.
The syringe 200 shown in FIG. 3 (A) has, for example, a storage capacity of 10 mL, and the syringe 300 shown in FIG. 3 (B) has, for example, a storage capacity of 5 mL, and the syringe shown in FIG. 3 (C). 400 is, for example, 2.0 mL of a chemical solution.

  As shown in FIG. 3, the syringe main bodies 201, 301, and 401 of the syringes 200, 300, and 400 have different sizes, and the sizes of the main body flanges 209, 309, and 409 are increased as the capacity of the syringe main body increases. Is getting bigger. The syringe bodies 301 and 401 of the syringes 300 and 400 can be housed and fixed in the syringe body holding section 8D of the housing section 8 in the same manner as the syringe 200 shown in FIGS. However, although three types of syringes are illustrated in FIG. 3, the present invention is not limited to this, and the amount of chemical liquid that can be stored in the syringe may be 2.0 mL to 50 mL, for example, 20 mL, 30 mL, 50 mL, or the like. . The accommodation capacity of the syringe that can be set for the syringe pump 1 can be arbitrarily selected.

Next, with reference to FIG. 4, an example of the electrical configuration of the syringe pump 1 shown in FIGS. 1 and 2 will be described.
In FIG. 4, the syringe pump 1 has a control unit (computer) 100 that controls the overall operation. The control unit 100 is a one-chip microcomputer, for example, and includes a ROM (read only memory) 101, a RAM (random access memory) 102, a nonvolatile memory 103, and a clock 104. The clock 104 can correct the current time by a predetermined operation, and can acquire the current time, measure the elapsed time of a predetermined liquid feeding operation, measure the reference time of liquid feeding speed control, and the like.

The control unit 100 shown in FIG. 4 is connected to a power switch button 4S and a switch 111. The switch 111 supplies power to the control unit 100 from either the power converter unit 112 or the rechargeable battery 113 by switching between the power converter unit 112 and the rechargeable battery 113 such as a lithium ion battery. The power converter unit 112 is connected to a commercial AC power source 115 via an outlet 114.
In FIG. 4, a pair of detection switches 120 and 121 are arranged in the accommodating portion 8. The detection switches 120 and 121 detect whether or not the syringe body 201 of the syringe 200 is correctly arranged in the storage unit 8 and notify the control unit 100 of it.

A potentiometer 122 as a clamp sensor shown in FIG. 4 is connected to the clamp 5. The potentiometer 122 detects the amount of movement of the clamp 5 when the clamp 5 moves in the Y2 direction in a state where the syringe body 201 is clamped by the clamp 5. 401) sends a detection signal to the control unit 100 to notify whether it is clamped by the clamp 5 or not. The control unit 100 obtains the amount of movement of the clamp 5 in the Y direction based on the detection signal from the potentiometer 122, and for example, which of the multiple types of syringe bodies 201, 301, 401 shown in FIG. Can be determined.
When the motor 133 of the syringe pusher driving unit 7 shown in FIG. 4 is driven by the motor driver 134 in response to a command from the control unit 100, the feed screw 135 is rotated to move the syringe pusher pressing member 10 in the T direction. As a result, the syringe pusher pressing member 10 presses the syringe pusher 202 in the T direction so that the drug solution in the syringe main body 201 shown in FIG. 2 is accurately passed through the tube 203 to the patient P via the indwelling needle 204. To liquid.

In FIG. 4, the display driver 130 drives the display unit 3 according to a command from the control unit 100 to display various information, notification contents, and the like. The speaker 131 can notify various notification contents by voice according to a command from the control unit 100.
The control unit 100 can communicate bidirectionally with a computer 141 such as a desktop computer through the communication port 140. The computer 141 is connected to a chemical solution database (DB) 150, and the chemical solution information MF stored in the chemical solution database 150 is acquired by the control unit 100 via the computer 141, and the nonvolatile information of the control unit 100 is stored. It can be stored in the memory 103. The control unit 100 can display the chemical information MF and the like on the display unit 3 based on the stored chemical information MF.
In FIG. 4, a fast forward switch button 4B, a start switch button 4C, a stop switch button 4D, and a menu selection button 4E are electrically connected to the control unit 100.
In addition, the control unit 100 includes a photocoupler sensor 250 as a detector for detecting that the main body flange 209 is gripped by the main body flange pressing member 500 (see FIGS. 5 to 8). Connected. The photocoupler sensor 250 includes a light emitting element 251 and a light receiving element 252 that receives light from the light emitting element 251.

Next, the detailed structure of the syringe mounting part 6 will be described with reference to FIGS.
FIG. 5 is a perspective view showing a part of the syringe placing unit 6 and the syringe pusher driving unit 7 shown in FIG. FIG. 6 is a perspective view of a part of the syringe placement unit 6 and the syringe pusher drive unit 7 shown in FIG.
The syringe mounting part 6 shown in FIG. 5 is a main body flange presser for holding and holding the storage part 8 for storing the syringe main body 201, the clamp 5, and the main body flange 209 (see FIG. 3) of the syringe 200. A member 500 and a main body flange detection unit 600 are provided.
As shown in FIG. 1 and FIG. 2, as an example, the syringe main body 201 of the syringe 200 is set in the syringe placement unit 6, and the syringe main body 201 of the syringe 200 is fixed using the clamp 5. As shown in FIGS. 5 and 6, the accommodating portion 8 of the syringe mounting portion 6 is a recess capable of accommodating a part or all of the syringe body 201, and the axial direction of the accommodating portion 8 is along the X direction. Yes. A part of the outer peripheral surface of the syringe main body 201 is in close contact with the inner surface of the syringe main body holding portion 8D of the housing portion 8, and the remaining portion of the outer peripheral surface of the syringe main body 201 is exposed to the outside.
As shown in FIGS. 5 and 6, the main body flange pressing member 500 and the main body flange detection unit 600 constitute a main body flange gripping detection unit 650. The main body flange gripping detection unit 650 is provided to confirm that the main body flange pressing member 500 has inserted and gripped the main body flange 209 of the syringe 200 as an example. The main body flange detection unit 600 includes a photocoupler sensor 250 shown in FIG.

The structure of the main body flange pressing member 500 will be described with reference to FIGS.
The main body flange pressing member 500 shown in FIGS. 5 and 6 is formed of a thermoplastic resin and is disposed in parallel to the right side surface portion 8V of the syringe main body holding portion 8D of the housing portion 8. The main body flange pressing member 500 is disposed on a surface formed in the Y direction and the Z direction.
The front end portion 501 of the main body flange pressing member 500 has two introduction portions 502 and 503 and a concave portion 504 formed between these introduction portions 502 and 503.
7A is a perspective view showing an example of the shape of the main body flange pressing member 500 shown in FIGS. 5 and 6, and FIG. 7B is seen from the line JJ in FIG. It is a figure which shows the state by which the flange pressing member 500 is being fixed.
FIG. 8 shows a state in which the main body flange 209 of the syringe 200 is fitted and gripped using the main body flange pressing member 500.

As shown in FIG. 7A, the main body flange pressing member 500 has a front end portion 501, two base portions 506A and 506B, and two elastic deformation portions 588A and 588B. The distal end portion 501 and the base portions 506A and 506B are integrally formed with thin elastic deformation portions 588A and 588B, respectively. Accordingly, when the distal end portion 501 is pushed by the main body flange 209 of the syringe 200, the distal end portion 501 can easily move in the WV direction by elastically deforming the elastic deformation portions 588A and 588B with respect to the base portion 506.
As shown in FIGS. 6 and 7A, the distal end portion 501 has two introduction portions 502 and 503. The inner surfaces 502A and 503A of these introduction portions 502 and 503 are inclined so as to be tapered. Accordingly, as shown in FIG. 7A to FIG. 8, the medical worker uses the two introduction portions 502 and 503 to connect the main body flange 209 of the syringe 200 to the inner surface 509 of the main body flange pressing member 500 and the syringe. There is an advantage that it can be easily inserted along the Y2 direction between the right side surface portion 8V of the main body holding portion 8D.

  As shown in FIG. 6, the introduction portion 502 is located on the upper side and the introduction portion 503 is located on the lower side when the syringe pump 1 is used. As shown in FIG. 7, a smaller concave portion 505 is preferably formed at the center position of the concave portion 504. The small concave portion 505 is a groove portion for inserting a part of the blade portion 202W of the syringe pusher 202 shown in FIG. 7B in a state where the syringe 200 is mounted. Accordingly, when the main body flange 209 is fitted between the inner surface 509 and the right side surface portion 8V of the main body flange pressing member 500 and gripped, the blade portion 202W of the syringe presser 202 is placed on the surface of the concave portion 504 of the main body flange pressing member 500. There ’s nothing to get on. For this reason, the syringe 200 can be reliably fixed to a predetermined position. This applies not only to the syringe 200 but also to the syringes 300 and 400 shown in FIG. In this way, a syringe with a chemical capacity of 2.0 mL to 50 mL can be used.

Next, an example of the shape of the boot 800 as the covering member shown in FIGS. 5 and 6 will be described.
As shown in FIG. 4, the boot 800 covers the periphery of a machine element such as a feed screw 135 that will be described later, and is a stretchable member. As shown in FIG. 5, the boot 800 is disposed between the right side surface portion 8 </ b> V of the syringe body holding portion 8 </ b> D of the housing portion 8 and the cover member 80 of the syringe pusher pressing member 10. The boot 800 has a splash-proof structure to cover machine elements such as the feed screw 135 shown in FIG. As a result, for example, even if the chemical solution in the syringe body 201 is spilled, the drip solution disposed above is spilled down, or the disinfecting solution used in the vicinity is scattered, it adheres to mechanical elements such as the feed screw 135. Can be prevented.
The boot 800 is made of, for example, rubber or plastic that can expand and contract, and can expand and contract as the syringe pusher pressing member 10 moves in the X1 direction and the X2 direction. As illustrated in FIG. 6, the boot 800 includes, for example, a plurality of first convex portions 811, 812, 813, 814 and the like, a plurality of second convex portions 821 having a diameter smaller than the first convex portion, A connecting portion 830 is provided. Thereby, when the syringe pusher pressing member 10 is moved to the left side and the boot 800 is contracted, the second convex portion 821 enters between the first convex portions having a larger diameter, so that the length of the contracted state is reduced. Can be small. For this reason, compared with the case where the convex part of the same diameter is arranged, the syringe pusher pressing member 10 can move to the left side without being obstructed by the boot 800, and the movement amount of the syringe pusher pressing member 10 is increased. it can.

The body flange pressing member 500 shown in FIGS. 7A and 7B has a substantially L-shaped cross section, and is made of an elastically deformable metal such as stainless steel or an elastically deformable plastic. Yes. The main body flange pressing member 500 is fixed to a portion 507 of the casing 2 of the syringe pump so as to be substantially parallel to the right side surface portion 8V of the syringe main body holding portion 8D. One end of the main body flange pressing member 500 is an attachment base 506. The other end portion of the main body flange pressing member 500 is a free end portion that has an introduction portion 502 and an introduction portion 503 and is movable. As shown in FIG. 7B, the attachment base 506 is fixed to a part 507 of the housing 2 of the syringe pump using screws 506N and a boss 50B.
As shown in FIG. 7, two protrusions 511 are formed on the inner surface side of the main body flange pressing member 500 so as to protrude toward the right side surface portion 8V shown in FIG. Yes. As shown in FIGS. 7B to 8, when the main body flange 209 is inserted between the inner surface 509 and the right side surface portion 8 </ b> V of the main body flange pressing member 500, these protruding portions 511 are formed on the outer surface of the main body flange 209. It is a part that is surely abutted against 209S.

In FIG. 7B, the gap CG formed between the inner surface 509 and the right side surface portion 8V of the main body flange pressing member 500 is set smaller than the thickness G of the main body flange 209. Accordingly, when the main body flange 209 is inserted and fixed, the main body flange 209 elastically deforms the main body flange pressing member 500 in the WV direction, so that the two protruding portions 511 cause the outer surface 209S of the main body flange 209 to be deformed. It has a structure that can be reliably and stably held by pressing with an elastic force.
As shown in FIG. 1, when the syringe 200 is disposed in close contact with the syringe main body holding portion 8D of the housing portion 8, as shown in FIG. 8, a part of the main body flange 209 is a right side surface portion of the syringe main body holding portion 8D. 8V and the front end 501 of the main body flange pressing member 500 are inserted. That is, as shown in FIGS. 7B and 8, when the main body flange 209 is fitted in the gap CG between the inner surface 509 of the main body flange pressing member 500 and the right side surface portion 8V along the Y2 direction, FIG. As illustrated, the main body flange pressing member 500 is elastically deformed by being pushed in the WV direction around the mounting base 506 shown in FIG. It will be tilted.
As shown in FIG. 8, a part of the main body syringe 209 is sandwiched between the right side surface portion 8V and the main body flange pressing member 500, and the repulsive force when the main body flange pressing member 500 elastically deforms, It is sandwiched and gripped between the flat right side surface portion 8V and the protruding portion 511 of the main body flange pressing member 500. Thereby, as shown in FIG. 1 and FIG. 2, the syringe 200 can be reliably gripped using the main body flange 209.

FIG. 9 is an exploded perspective view of the front cover 2F, the syringe pusher drive unit 7, the main body flange pressing member 500, the syringe pusher pressing member 10, and the cover member 2V as seen from the rear side.
In FIG. 9, the inner surface side of the front cover 2F is shown, and the front cover 2F has a main body housing portion 2M and an extending portion 2N formed to extend sideways from the main body housing portion 2M. The syringe pusher drive unit 7, the main body flange pressing member 500, and the syringe pusher pressing member 10 are housed inside the main body housing portion 2M and the extension portion 2N. A cover member 2V is fixed to the extension 2N with screws.
The syringe pusher drive unit 7 shown in FIG. 9 includes a drive unit main body 700, a syringe pusher pressing member 10, and a pressing operation unit 701 of a syringe pusher pressing member connected to the syringe pusher pressing member 700. . The boot 800 already described is disposed between the main body flange pressing member 500 and the syringe presser pressing member 10. The drive part main body 700 is accommodated in the lower part of the main body accommodating part 2M of the front cover 2F, and the pressing operation part 701 of the syringe pusher pressing member and the syringe pusher pressing member 10 are accommodated in the extension part 2N.

FIG. 10 shows a structural example of the syringe pusher drive unit 7 shown in FIG. 9, and is a view showing a cross section taken along the line ES-ES of the syringe pusher drive unit 7 of FIG. FIG. 11A is a perspective view having a cross section showing a structural example of the driving unit main body 700 of the syringe pusher driving unit 7, and FIG. 11B shows a structural example of the driving unit main body 700 of the driving unit 7. It is a perspective view which has the cross section seen from the other side. In FIGS. 10 and 11, the boot 800 is not shown for the sake of simplicity.
With reference to FIG. 10 and FIG. 11, the structural example of the drive part main body 700 of the syringe pusher drive part 7 and the press operation part 701 of a syringe pusher press member is demonstrated. As shown in FIGS. 10 and 11A, the drive unit main body 700 includes a case 702, a motor 133, a support member 703, two guide bars 704 and 705, and a bush guide 706. .

As shown in FIGS. 10 and 11A, the case 702 includes, for example, a side surface portion 702A, a side surface portion 702B, and an end surface portion 702C. The side surface portion 702A and the side surface portion 702B are formed long in the X direction and are parallel to each other. One end of the side surface portion 702A and the side surface portion 702B is an end surface portion 702C, and the other end portion of the side surface portion 702A and the side surface portion 702B is fixed to the mounting member 707 of the support member 703. .
The support member 703 includes a flat mounting member 707 and a cover member 708 fixed to the mounting member 707. The case 702 and the support member 703 are made of plastic or metal. A motor 133 is attached to the attachment member 707. As illustrated in FIG. 10, a gear 133 </ b> G is fixed to the output shaft of the motor 133, and another gear 135 </ b> G is fixed to the feed screw 135. The gear 133G meshes with the gear 135G. The gears 133G and 135G are accommodated in the cover member 708. Thus, when the output shaft of the motor 133 rotates, the feed screw 135 can perform forward rotation and reverse rotation via the gears 133G and 135G.

  As shown in FIGS. 10 and 11A, the feed screw 135 is disposed at the center of the case 702 so as to be rotatable along the rotation center axis LLC. The rotation center axis LLC is parallel to the X direction. The feed screw 135 has a male screw portion 710. For example, a sawtooth screw can be adopted as the male screw portion 710. One end of the feed screw 135 has a columnar rotation support portion 711. The other end portion of the feed screw 135 fixes the gear 135G, and the other end portion of the feed screw 135 is rotatably supported by a rolling bearing 712. The rolling bearing 712 is fixed to the mounting member 707.

The outer diameter dimension of the rotation support portion 711 of the feed screw 135 is larger than the outer diameter dimension of the male screw portion 710. Thereby, the rotation support portion 711 of the feed screw 135 can be rotated so as to be inscribed in the inner peripheral surface of the inner pipe member 741, and the feed screw 135 uses the rolling bearing 712 and the inner peripheral surface of the inner pipe member 741. As both ends are supported, the inner pipe member 741 can rotate smoothly.
Both end portions of the guide bars 704 and 705 are fixed to the attachment member 707 and the end surface portion 702C, respectively, and are arranged in parallel along the X direction. The guide bars 704 and 705 are arranged in parallel on both sides of the feed screw 135 with the feed screw 135 interposed therebetween. The bush guide 706 is fixed to the outer surface of the end surface portion 702C.
When the motor 133 shown in FIG. 10 is driven by the motor driver 134 in accordance with a command from the control unit 100 shown in FIG. 4, the feed screw 135 can be rotated forward and backward via the gears 133G and 135G.

Next, structural examples of the syringe pusher pressing member 10 of the syringe pusher driving unit 7 and the pressing operation unit 701 of the syringe pusher pressing member will be described with reference to FIGS. 10 to 13. 12 is a perspective view showing a structural example of the syringe pusher pressing member 10 and the shaft clutch portion 720 of the pressing operation portion 701. FIG. 13 is a perspective view of the shaft clutch portion 720 of the pressing operation portion 701 of the syringe pusher pressing member. It is a perspective view which shows the example of a structure.
As shown in FIGS. 10 and 12, the syringe pusher pressing member 10 is made of, for example, plastic, and includes a main body portion 80 and a release operation portion 730 for manual operation. When the medical staff pushes the release operation unit 730 with his / her finger in the RR direction, the release operation unit 730 is changed from the initial state shown in FIG. 12 (A) to the state after the operation shown in FIG. Thus, the rotation operation can be performed against the force of the spring 747 around the rotation center axis LLC along the RR direction. Then, when the medical attendant releases the finger from the release operation unit 730, the state after the operation shown in FIG. 12B can be automatically returned to the initial state shown in FIG. 12A by the force of the spring 747. it can.

The pressing operation portion 701 of the syringe pusher pressing member shown in FIGS. 10 and 11 has the following elements. The pressing operation portion 701 of the syringe pusher pressing member includes an inner pipe member 741, an outer pipe member 742, a half nut member 750, and a cover member 745.
The inner pipe member 741 is a first pipe, and the outer pipe member 742 is a second pipe disposed outside the inner pipe member 741. The inner pipe member 741 covers the periphery of the feed screw 135, and the outer pipe member 742 covers the periphery of the inner pipe member 741. The feed screw 135, the inner pipe member 741, and the outer pipe member 742 are arranged coaxially about the rotation center axis LLC. The outer pipe member 742 protects the inner pipe member 741 and the feed screw 135.
As shown in FIG. 10, one end 741 </ b> A of the inner pipe member 741 is mechanically connected to the release operation unit 730. The other end 741B of the inner pipe member 741 is mechanically connected to the half nut member 750. Accordingly, when the medical worker pushes the release operation unit 730 with the finger in the RR direction, the inner pipe member 741 is rotated, so that the half nut member 750 is connected to the rotation angle of the release operation unit 730 via the inner pipe member 741. It can be rotated in the RR direction by the same angle TU.

On the other hand, as shown in FIG. 10, one end 742 </ b> A of the outer pipe member 742 is mechanically connected to the main body 80 of the syringe pusher pressing member 10. The other end 742 </ b> B of the outer pipe member 742 is mechanically connected to the cover member 745 of the half nut member 750. An outer pipe member 742 passes through the bush guide 706. The outer pipe member 742 is a member that guides the bush guide 706 when the bush guide 706 moves along T (X2 direction).
Thereby, the syringe pusher pressing member 10 and the cover member 745 of the half nut member 750 are integrated using the outer pipe member 742, and the medical worker holds the syringe pusher pressing member 10 in the T direction. By manually moving in the (X2 direction) or X1 direction, the syringe pusher pressing member 10 and the cover member 745 of the half nut member 750 can be integrally moved in the T direction (X2 direction) or the X1 direction. .

As shown in FIGS. 13 and 12, two guide bars 704 and 705 are passed through the hole of the cover member 745. As a result, the cover member 745 can be linearly moved in the X direction by the two guide bars 704 and 705. As shown in FIG. 12, the half nut member 750 is arranged in the cover member 745, and one guide bar 704 passes through the hole 751 of the half nut member 750, but the half nut member 750 does not pass another guide bar 705. Accordingly, the half nut member 750 can swing around the single guide bar 704.
As shown in FIG. 12, the half nut member 750 is a substantially rectangular plate-like member, and has a protrusion 752 and an opening 753. A spring 747 as a biasing member for the half nut member 750 is provided between the protruding portion 752 and the fixed portion 746 of the cover member 745.

The opening 753 shown in FIG. 12 is formed in a substantially rectangular shape, and the male screw portion 710 of the feed screw 135 passes through the opening 753. The opening 753 is formed by edge portions 753A, 753B, 753C, and 753D, and a substantially semicircular female screw portion 760 is formed in the edge portion 753A. This female thread portion 760 can also be referred to as a half nut portion. As described above, the half nut member 750 is formed with the substantially semicircular female thread portion 760, and hence is particularly called a half nut member. In the initial state PS1 shown in FIG. 12A, the female screw portion 760 of the half nut member 750 is engaged with the male screw portion 710 of the feed screw 135.
On the other hand, in the state PS2 after the operation shown in FIG. 12B, the half nut member 750 is angled in the RR direction around the guide bar 704 in the cover member 745 against the force of the spring 747. By rotating by TU, the female screw portion 760 of the half nut member 750 is separated from the male screw portion 710 of the feed screw 135. Thus, the meshing state between the female screw portion 760 and the male screw portion 710 of the feed screw 135 can be released.

Here, means for rotating the half nut member 750 from the initial state PS1 shown in FIG. 12A to the post-operation state PS2 shown in FIG. 12B will be described.
The means for rotating the half nut member 750 includes a release operation portion 730, an inner pipe member 741, and a clutch member 770 shown in FIG.
As shown in FIG. 10, as already described, the release operation portion 730 and the one end portion 741A of the inner pipe member 741 are mechanically connected. As shown in FIG. 12, a clutch member 770 protrudes and is fixed to the outer periphery of the inner pipe member 741 in the radial direction. As shown in FIG. 12, the clutch member 770 is disposed so as to abut against the edge portion 753 </ b> A of the half nut member 750.

  Accordingly, as shown in FIG. 12A, when the medical worker pushes the release operation unit 730 in the RR direction with a finger, the inner pipe member 741 and the clutch member 770 are moved along with the movement of the release operation unit 730 in the RR direction. Rotates in the RR direction. Therefore, the half nut member 750 can be rotated in the RR direction by an angle TU against the force of the spring 747 as shown in FIG. Thus, when the half nut member 750 rotates, in the initial state PS1 shown in FIG. 12A, the female thread portion 760 of the half nut member 750 meshes with the male thread portion 710 of the feed screw 135. In the state PS2 after the operation of B), the female screw portion 760 of the half nut member 750 is separated from the male screw portion 710 of the feed screw 135. In this way, the meshing state between the female screw portion 760 and the male screw portion 710 of the feed screw 135 can be released. When the medical worker releases his / her finger from the release operation portion 730, the half nut member 750 is moved from the state PS2 after the operation in FIG. 12 (B) to the initial state PS1 shown in FIG. 12 (A) by the force of the spring 747. Can be automatically restored.

Next, an operation example of the syringe pump 1 according to the embodiment of the present invention will be described.
The medical staff selects, for example, the syringe 200 from the plurality of types of syringes 200, 300, and 400 shown in FIG. 3, and attaches the syringe 200 to the syringe pump 1 as shown in FIGS. To do.
The syringe main body 201 is accommodated in the syringe main body holding portion 8D of the accommodating portion 8, and is fixed by the clamp 5 in a state where the tube 203 is fitted in the tube fixing portion 9. Thereby, the syringe main body 201 can be reliably fixed in the syringe main body holding part 8D of the accommodating part 8.

Moreover, as shown in FIGS. 7A to 8, a part of the main body syringe 209 is sandwiched between the right side surface portion 8V and the main body flange pressing member 500, and the main body flange pressing member 500 is elastically deformed. Due to the repulsive force, the flat right side surface portion 8V and the protruding portion 511 of the main body flange pressing member 500 are sandwiched and gripped. Thereby, as shown in FIG. 1 and FIG. 2, the syringe 200 can be reliably gripped using the main body flange 209.
Moreover, as shown in FIGS. 1 and 2, when the syringe main body 201 is accommodated and mounted in the syringe main body holding portion 8 </ b> D of the accommodating portion 8, the syringe pusher 202 is disposed in the syringe pusher driving portion 7. The In this case, it is necessary to abut the pusher flange 205 of the syringe pusher 202 against the abutment surface portion 80D of the main body portion 80 of the syringe pusher pressing member 10.
Therefore, as shown in FIGS. 10 and 12A, when the medical worker presses the release operation portion 730 of the syringe pusher pressing member 10 with the finger in the RR direction, the release operation portion 730 is Rotation operation can be performed around the rotation center axis LLC along the RR direction so that the initial state PS1 shown in FIG. 12A becomes the post-operation state PS2 shown in FIG. 12B.

As shown in FIG. 12A, when the medical worker pushes the release operation unit 730 with the finger in the RR direction, the inner pipe member 741 rotates in the RR direction as the release operation unit 730 moves in the RR direction. For this reason, since the clutch member 770 of the inner pipe member 741 rotates in the RR direction, the half nut member 750 resists the force of the spring 747 as shown in FIG. Can be rotated.
When the half nut member 750 rotates, in the initial state PS1 shown in FIG. 12A, the female screw portion 760 of the half nut member 750 is engaged with the male screw portion 710 of the feed screw 135, but as shown in FIG. In the state PS2 after the operation, the female screw portion 760 of the half nut member 750 is separated from the male screw portion 710 of the feed screw 135. Thereby, the meshing state between the female screw portion 760 and the male screw portion 710 of the feed screw 135 can be reliably released.
Then, the medical staff pushes the syringe pusher pressing member 10 in the T (X2 direction) direction while pressing the release operation unit 730 with the finger in the RR direction, whereby the syringe pusher pressing member 10 is Regardless of the presence of the feed screw 135, the abutment surface portion 80D of the main body portion 80 of the syringe pusher pressing member 10 is aligned with the position of the pusher flange 205 of the syringe pusher 202, as shown in FIGS. Can be surely hit.

After the abutment surface portion 80D of the main body portion 80 of the syringe pusher pressing member 10 is abutted against the pusher flange 205 of the syringe pusher 202, the medical worker stops pressing with the finger in the RR direction of the release operation portion 730. Then, the release operation unit 730 moves in the direction opposite to the RR direction and returns to the initial state PS1 as shown in FIG. Thereby, in the initial state shown in FIG. 12A, the female screw portion 760 of the half nut member 750 engages with the male screw portion 710 of the feed screw 135.
Therefore, when the motor 133 of the syringe pusher drive unit 7 shown in FIG. 10 is driven by the motor driver 134 in response to a command from the control unit 100, the feed screw 135 is rotated via the gears 133G and 135G. Therefore, the cover member 745 including the half nut member 750 moves the syringe pusher pressing member 10 in the T direction along the two guide bars 704 and 705 by the rotation of the feed screw 135. As a result, the syringe pusher pressing member 10 presses the syringe pusher 202 in the T direction so that the drug solution in the syringe main body 201 shown in FIG. 2 is accurately passed through the tube 203 to the patient P via the indwelling needle 204. Can be fed to

When the operation of the motor 133 is stopped and the liquid feeding is completed, the medical worker presses the release operation unit 730 in the RR direction with a finger to change from the initial state PS1 shown in FIG. 12A to FIG. ) To the state PS2 after the operation. For this reason, since the female screw portion 760 of the half nut member 750 is separated from the male screw portion 710 of the feed screw 135, the engagement between the female screw portion 760 and the male screw portion 710 of the feed screw 135 is released, The syringe pusher pressing member 10 is pushed in the X1 direction opposite to the T (X2 direction) direction while being pressed in the RR direction of the release operation unit 730 with a finger.
Thereby, regardless of the presence of the feed screw 135, the abutment surface portion 80D of the main body portion 80 of the syringe pusher pressing member 10 shown in FIGS. 1 and 2 can be separated from the pusher flange 205 of the syringe pusher 202. . Then, the syringe 200 can be easily removed from the syringe pump 1 by operating the clamp 5 shown in FIGS. 1 and 2 to release the clamp 5 from the syringe body 201.

By the way, as already explained, the inner pipe member 741 shown in FIGS. 10 and 12 covers the periphery of the feed screw 135, and the outer pipe member 742 covers the periphery of the inner pipe member 741. The feed screw 135, the inner pipe member 741, and the outer pipe member 742 are arranged coaxially about the rotation center axis LLC.
This has the following two merits. As a first merit, since the outer pipe member 742 protects the inner pipe member 741 and the feed screw 135 by covering them, for example, the drug solution in the syringe body 201 is spilled, or the drip solution disposed above Even if the spillage falls or the disinfecting liquid used in the vicinity is scattered, it can be prevented from adhering to the feed screw 135 and the inner pipe member 741.

Further, as a second merit, as shown in FIG. 2, in the state where the syringe 200 is attached to the syringe pump 1, for example, when the tube 203 connected to the syringe 200 is blocked, the syringe The chemical solution in the main body 201 cannot be pushed out through the tube 203, and the syringe pusher pressing member 10 of the syringe pusher drive unit 7 cannot push the syringe pusher 202 of the syringe 200. Examples of the case where the tube 203 is blocked include a case where bubbles are mixed in the chemical solution or the concentration of the chemical solution is high.
In this case, even if the motor 133 shown in FIG. 10 further rotates the feed screw 135, the feed screw 135, the outer pipe member 742, and the inner pipe member 741 are arranged coaxially. No moment is generated between the outer pipe member 742 and the inner pipe member 741. Therefore, the feed screw 135, the outer pipe member 742, the inner pipe member 741, and the case 702 are not deformed.
Since it is possible to avoid deformation of each element in this way, it is possible to prevent the detection accuracy of a detection device (not shown) that detects the closed state of the tube 203 from being lowered.
Although the feed screw 135 has a sawtooth shape, the feed screw 135, the outer pipe member 742, the inner pipe member 741, and the case 702 are not deformed. Therefore, the half nut member 750 and the male screw portion of the feed screw 135 are not deformed. The engagement state with 710 does not come off and the syringe pusher pressing member 10 can be accurately sent by the rotation of the feed screw 135, and the syringe pusher pressing member 10 always pushes the syringe pusher 202 reliably, The drug solution in the syringe main body 201 shown in FIG. 2 can be accurately sent to the patient P through the tube 203 via the indwelling needle 204.

Here, a comparative example for comparison with the above-described embodiment of the present invention will be described. FIG. 14 shows a structure of a syringe pusher drive unit of a syringe pump that is a comparative example with respect to the embodiment of the present invention.
A guide bar 1001, a feed screw 1002, a half nut member 1003, a pipe 1004, and a motor 1005 are attached to the case 1000. The male screw portion of the feed screw 1002 and the female screw portion 1006 of the half nut member 1003 are engaged with each other. The half nut member 1003 is fixed to the end of the pipe 1004. When the motor 1005 is driven, the feed screw 1002 rotates, and the half nut member 1003 can be guided in the X direction by the guide bar 1001.
However, the center axis LS1 of the feed screw 1002 and the center axis LS2 of the pipe 1004 are separated and parallel to each other, and the feed screw 1002 and the pipe 1004 are not coaxially arranged. For this reason, when the structure of the syringe pusher drive part of a comparative example is employ | adopted, there exist the following problems.

  In the state where the syringe is mounted on the syringe pump of the comparative example shown in FIG. 14, when a blockage occurs in the tube connected to the syringe, the syringe pusher driving unit can push the pusher of the syringe. In spite of being unable to do so, the motor 1005 further rotates the feed screw 1002. However, since the feed screw 1002 and the pipe 1004 are not coaxially arranged and the feed screw 1002 and the pipe 1004 are parallel to each other and have a distance, a moment is generated between the feed screw 1002 and the pipe 1004. The feed screw 1002, the pipe 1004, and the case 1000 are deformed. If each element is deformed in this manner, the detection accuracy of the detection device that detects the closed state of the tube is lowered. Further, since the feed screw 1002 has a sawtooth shape and the feed screw 1002, the pipe 1004, and the case 1000 are deformed, the half nut member 1003 and the feed screw 1002 may be disengaged.

  The present invention is not limited to the above embodiment, and various modifications can be made without departing from the scope of the claims. A part of each configuration of the above embodiment can be omitted, or can be arbitrarily combined so as to be different from the above.

  DESCRIPTION OF SYMBOLS 1 ... Syringe pump, 2 ... Housing | casing (housing | casing), 6 ... Syringe mounting part, 7 ... Syringe pusher drive part, 10 ... Syringe pusher pressing member, 80 ... Main body part of syringe pusher pressing member, 133... Motor, 135... Feed screw, male screw part 200, 300, 400... Syringe, 201... Syringe body, 202. 500... Main body flange pressing member, 700... Drive unit main body, 701... Syringe pusher pressing member pressing operation unit, 702... Case, 710.・ Syringe pusher pressing member release operation section, 741... Inner pipe member, 742... Outer pipe member, 745 .. cover member, 750... Half nut member, 760. Female thread

Claims (6)

A syringe pump that attaches a syringe and sends the drug solution to a patient,
A syringe placement unit for setting the syringe body of the syringe;
A syringe pusher drive unit that pushes the syringe pusher of the syringe body set in the syringe placement unit and pushes out the drug solution in the syringe body, and
The syringe pusher drive unit is
Case and
A lead screw rotatably arranged in the case;
A syringe pusher pressing member for pushing the syringe pusher toward the syringe main body by moving against the syringe pusher and moving along the feed screw by rotation of the feed screw;
A half nut member having a female thread portion that meshes with and disengages from the male thread portion of the feed screw;
A pipe member that covers the feed screw and connects the syringe pusher pressing member and the half nut member;
The syringe pump, wherein the feed screw and the pipe member are coaxial.   The pipe member is an inner pipe member that covers the feed screw, further covers a cover member that holds the half nut member, covers the inner pipe member, and connects the cover member and the syringe pusher pressing member. The syringe pump according to claim 1, further comprising an outer pipe member, wherein the feed screw, the inner pipe member, and the outer pipe member are coaxial.   The syringe pusher pressing member has a release operation portion, one end portion of the inner pipe member is connected to the release operation portion, and the other end portion of the inner pipe member is operated with the release operation portion. The syringe pump according to claim 1 or 2, wherein a clutch member is provided for rotating the half nut member to separate the female screw portion of the half nut member from the male screw portion of the feed screw. .   4. The motor according to claim 1, further comprising a motor that rotationally drives the feed screw, wherein a gear fixed to the output shaft of the motor and a gear fixed to the feed screw are engaged with each other. The syringe pump as described.   The syringe pump according to any one of claims 1 to 4, wherein the syringe mounting portion includes a main body flange pressing member that detachably holds and presses a main body flange of the syringe main body.   A display unit for displaying information and an operation panel unit having operation buttons are disposed on the upper part of the syringe pump main body, and the syringe placement unit and the syringe pusher are disposed on the lower part of the syringe pump main body. 6. The syringe pump according to claim 1, wherein a child drive unit is disposed.

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