JP3184862B2 - Infusion device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to an infusion device,
More particularly, the present invention relates to a drive mechanism of an infusion device for injecting a medical solution, blood, or the like into a human body by moving a suction tube of a syringe by rotation of a motor.

[0002]

2. Description of the Related Art Conventionally, there are many improved techniques for an infusion device which has a feed screw driven by a prime mover and presses a syringe sucker by a linearly movable slider engaged with the feed screw to send out liquid. There has been proposed a configuration in which the engagement and disengagement of the slider with the feed screw and the operation of the engagement of the syringe can be performed in an interlocked manner. As a first example, Japanese Utility Model Application Laid-Open No. 58-89053 has been proposed. Some are disclosed in the gazette. This publication discloses that "a slide mechanism is provided on a driving claw fitted on a driving body when a syringe is mounted, and the driving claw is slid while a half nut and a screw shaft fixed integrally with the driving body are provided. 7A and FIG. 7B are main drawings.
A second example is disclosed in Japanese Patent Application Laid-Open No. 3-247347. This publication states that "a movable block is provided so as to be reciprocally movable in the axial direction of a syringe and is linked with a drive mechanism. In addition, a pressing portion of the sucker is provided on the movable block, and an engaging portion of the pressing member with the sucker is provided. A configuration in which a half nut can engage and disengage with a feed screw in conjunction with the movement of the movable block, as well as being provided so as to be reciprocally movable between a position engaging with the sucker and a disengagement position disengaging the engagement. The main drawing is shown in FIG.

[0003]

The first and second examples described above use the force of a spring as a mechanism for separating and connecting a feed screw and a half nut as shown in FIGS. 7A, 7B and 8. In such a case, the half nut is pressed against the feed screw, so that there is a problem that the half nut floats up from the feed screw in a load state and the feeding operation becomes inaccurate. Further, both the first and second examples have suction. The operation of attaching and detaching the slider to and from the slider and the operation of detaching and connecting the half nut to the feed screw are performed integrally. Is merely provided with a simple groove, and the unstable state of the holding state due to the gap between the groove and the groove due to the variation in the size of the flange of the sucker is not eliminated. In the conventional configuration as described above, in order to prevent the lifting occurring between the feed screw and the detachable half nut when a load is applied, generally, the tooth profile of the screw is a plane perpendicular to the traveling direction of the screw. It is good to have a rectangular tooth profile cross-section in parallel with the screw. However, there is a problem that a screw having a rectangular tooth profile is expensive because its manufacturing means is limited, and
Since the groove of the collar holding member of the sucker is a fixed groove, when the syringe is mounted on the device, the flange of the sucker is attached to the holding member by play with the groove of the holding member due to variation in the size of the collar of the sucker. There is a problem that it is not securely held. It is an object of the present invention to solve such a problem and to provide a high-precision infusion device at low cost.

[0004]

According to the infusion device of the present invention, the mechanism for releasing the half nut from the feed screw of the half nut release device interlocking with the release lever provided on the slider is provided by a release cam having a step. It is characterized by having means for pressing, and means for pressing and holding the collar of the sucker against the slider by a holding arm of the collar for holding the collar of the slider of the slider. In addition, the feed screw can be mass-produced by forming the feed screw with a tooth profile that is inclined with respect to a plane perpendicular to the traveling direction of the screw.

[0005]

In the above construction, when the release cam of the half nut release device moves in the direction of movement of the interlocking rod, the release cam operates so as to press the half nut against the feed screw, and acts on the half nut when a load is applied. Since the release cam receives the vertical component of the force, the half nut does not float. Also, since the collar of the sucker is pressed against the slider by the arm provided on the slider and is securely held, there is a gap between the end of the slider and the end of the sucker. With no movement, the movement of the slider and the movement of the sucker completely match, and accurate infusion can be performed.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. 1A and 1B are views showing a half nut releasing device of a first embodiment according to the present invention in an engaged state and a half nut is engaged with a feed screw. FIG. 1A is a side view of a main part, and FIG. 2A and 2B are cross-sectional views of the main part along the line AA 'in FIG. 1A, and FIGS. 2A and 2B are views in which the half nut is in a released state, FIG. 2A is a side view of the main part, and FIG.
It is principal part sectional drawing along the -A 'line. 1A and 1
B, 2A and 2B, 1 is a syringe, 2 is a sucker, 3 is a slider, 3-5 is an extension of the slider, 7
Is an interlocking rod, 8 is a return spring, 9 is a half nut release device,
9-2 is a release cam, 10 is a main body of the infusion device, 11 is a half nut holding portion, 11-1 is a half nut sliding groove, 11
Release spring of -3 half nut, 12 is a feed screw, 13 is a half nut, and 13-2 is a bearing.

In FIG. 1A and FIG. 1B, FIG. 2A and FIG. 2B, the feed screw 12 is extended from the slider 3 in parallel with the feed screw 12 to an extended portion 3-5 integral with the slider 3.
A half nut holding portion 11 is provided so as to be freely movable, and a half nut sliding groove 11-1 is provided in the half nut holding portion 11 in a direction perpendicular to the feed direction of the feed screw 12, and the half groove is provided in the sliding groove 11-1. The half nut 13 is slidably inserted and the half nut 13 is supported on the feed screw 12 so as to be detachable,
Further, a half nut releasing device 9 is fixed to the tip of an interlocking rod 7 provided in parallel with the extending portion 3-5 and provided with a return spring 8, and the half nut releasing device 9 is opposed to an end of a half nut 13 of the half nut releasing device 9. A release cam 9-2 having a step in the direction of movement of the interlocking rod 7 is formed, and a bearing 13-2 provided at an end of the half nut 13 is in contact with the release cam 9-2 to hold the half nut. The half nut 13 is biased in the release direction by a second spring 11-3 for releasing the half nut provided on the portion 11.

As shown in FIGS. 2A and 2B, the push button 4-1 of the release lever 4 of the slider 3 is pushed and the interlocking rod 7 is pushed.
Is pushed to the left against the return spring 8, the interlocking rod 7
The release cam of the half nut release device 9 fixed to the left side moves to the left, and the half nut 1 is placed on the lower step of the release cam 9-2.
The third bearing 13-2 abuts, and the half nut 13 is separated from the feed screw 12 by the force of the second spring 11-3 so that the slider 3 can move freely.

As shown in FIGS. 1A and 1B, when the push button 4-1 of the release lever 4 of the slider 3 is returned and the interlocking rod 7 is returned by the return spring 8, the interlocking rod 7 moves rightward and becomes halfway. The bearing 13-2 of the half nut 13 contacts the high step portion of the release cam 9-2 of the nut release device 9, and the half nut 13 engages with the feed screw 12 against the second spring 11-3. Thus, since the half nut 13 is pressed by the high step portion of the release cam in the direction perpendicular to the advance direction of the feed screw, the half nut 13 does not rise above the feed screw under a load.

Next, the half nut releasing device 9 described above,
A description will be given of a second embodiment in which a holding arm for pressing and holding the collar portion of the sucker against the slider 3 is provided alongside the slider. FIGS. 3A and 3B are views showing a state before the collar of the syringe sucker is held on the slider 3. FIG.
FIG. 3B is a cross-sectional view taken along line AA ′ of FIG. 3A.
FIGS. 4A and 4B are views showing a state after the collar portion of the sucker is held by the slider 3, and FIG.
4B is a sectional view taken along line AA ′ of FIG. 4A.

In FIG. 3A, 1 is a syringe, 2 is a sucker, 2-1 is a flange of the sucker, 3 is a slider, 3-5 is an extended portion of the slider, and 2-2 is a sucker contact portion of the slider. ,
4 is a slider release lever, 4-1 is a push button, 4-
3 is a second support shaft of the slider release lever, 4-2 is a protrusion of the slider release lever, 5 is a sucker flange holding arm, 5
-1 is the arm support shaft, 5-2 is the arm return spring, 5-
3 is a projection of an arm, 7 is an interlocking rod, 8 is a return spring, 9 is a half nut releasing device, 9-2 is a release cam, 11 is a half nut holding portion, 12 is a feed screw, 13 is a half nut,
11-1 is a half nut sliding groove, 13-2 is a bearing, and 11-3 is a third return spring. In FIG. 3A, the slider 3 is located at a position away from the sucker 2, the push button 4-1 is pressed, and the slider release lever 4 is moved to the second position.
And the tip of the projection 4-2 on the left side of the slider release lever 4 pushes the projection 5-3 of the arm to return the arm 5 counterclockwise against the spring 5-2. The arm 5 is rotated to lower the position of the distal end of the arm 5 below the position of the collar portion 2-1 of the sucker so as to facilitate passage of the collar portion 2-1 of the sucker, as shown in FIG. 3B. The holding arm 5 is outside the collar portion 2-1 of the sucker. On the other hand, the other end of the slider release lever 4 moves the left end of the interlocking rod 7 to the left against the return spring 8 so that the half nut releasing device 9 integrated with the interlocking rod 7 is provided.
Is moved to the left, the bearing 13-2 comes into contact with the lower step of the release cam 9-2, and the half nut 13
Is moved downward by the force of the third spring 11-3, and the feed screw 1 is moved.
Since the engagement is released apart from the slider 2, the slider 3 can be freely moved in the moving direction of the sucker.

Next, the slider 3 is moved in the direction of the end of the suction rod 2 of the syringe, and the contact part 3-2 of the suction rod of the slider 3 is moved.
When the push button 4-1 of the release device of the slider is released by abutting the end of the flange portion 2-1 of the sucker 2, the protrusion 4-2 of the release lever 4 retreats as shown in FIG. The collar holding arm 5 is rotated clockwise by the force of the return spring 5-2 to bring the collar 2-1 of the sucker into contact with the abutment portion 2-2 of the slider 3 by the tip of the collar holding arm 5. Press and hold.

On the other hand, the interlocking rod 7 with which the other end of the slider release lever 4 is in contact moves to the right by the force of the return spring 8, and the half nut releasing device 9 integrated with the interlocking rod 7 also moves to the right. The half nut bearing 13-2 comes into contact with the higher step of the release cam 9-2, and the half nut 13 moves upward against the spring 11-3 to move the feed screw 1
2. Since the high step portion of the release cam 9-2 is formed in parallel with the feed screw, the feed screw 12
Therefore, even if the half nut is trying to float in the radial direction of the screw, the half nut is prevented from moving in the radial direction, so that accurate feeding can be ensured.

Next, the half nut releasing device 9 described above,
A description will be given of a third embodiment in which a holding arm for pressing and holding the collar portion of the sucker against the slider 3 is provided along with the slider. FIG. 5A and FIG. 5B are views showing a state before the flange of the syringe sucker is held on the slider 3.
5B is a side view of a main part, FIG. 5B is a sectional view taken along line AA ′ of FIG. 5A, FIG.
6A and 6B are views showing a state after the collar of the sucker is held by the slider 3, FIG. 6A is a side view of a main part, and FIG.
FIG. 3 is a line AA ′ diagram of A.

In FIGS. 5A and 5B, 6A and 6B, 1 is a syringe, 2 is a sucker, 3 is a slider,
-1 is a slider release button, 15 is a holding arm for holding the flange, and 15-1 is a support shaft of the holding arm 15. 5A and 5B show that the slider 3 is the syringe 1
The two holding arms 15 pivotally supported by the support shaft 15-1 in a state where the release button 4-1 is pressed at a position away from the collar portion 2-1 of the sucker, and the internal mechanism of the slider 3 As a result, it is possible to move away from the slider 3 and rotate in the direction of the arrow to contact the flange portion 2-1 of the open sucker with the contact portion 3-1. Next, when returning the closing release button 4-1 was abuts the abutting portion 3-1 by moving the slider 3 in the direction of吸子the flange 2-1 of吸子as shown in FIGS. 6A and 6B Holding arms 1 pivotally supported by a support shaft 15
5 comes closer to the slider 3 and rotates in the direction of the arrow to close the flange portion 2-1 of the sucker against the contact portion 3-1 of the slider 3 and hold it.

Details of this mechanism are shown in FIGS. 5A and 5B and FIGS. 6A and 6B. FIG. 5A shows slider 3
5B is a cross-sectional view taken along the line AA ′ of FIG. 5A. In FIG. 5B, the release button 4-1 is pressed, and the lever 4 moves the interlocking rod 7 to the left against the return spring 8 to release the half nut releasing device 9
Indicates that the half nut bearing 13-2 comes into contact with the lower step of the release cam 9-2, and the half nut 13 is moved downward by the force of the spring 11-3. The engagement is released from the screw 12. The slider 3 has two holding arms 15 rotatably supported by a support shaft 15-1 and movably in the traveling direction of the slider 3, and opposite to the side of the support shaft 15-1 having the holding arm 15. A groove for guiding the rotation operation is provided on the side, and the holding arm 15 is urged by a return spring 5-3 so as to press the holding arm 15 against the slider contact surface of the slider. On the other hand, the holding arm 1 supported on the support shaft 6-1 in conjunction with the release button 4-1
The driving lever 6 rotates clockwise, and an engaging pin 6-2 provided at an end of the lever 6 is provided on a supporting shaft 15-1 of the holding arm 15. 2 and the support shaft 15-1 moves leftward against the return spring 5-3 and the guide groove 5 engaged with the pin 6-1.
5B, the holding arm 15 is opened, as shown in FIG. 5B, so that the flange of the sucker can contact the contact surface of the slider 3.

In the state shown in FIGS. 5A and 5B, the slider 3 is moved to make contact with the collar of the sucker, and the release button 4-1 is returned. As shown in FIGS. 6A and 6B, the release lever 4 is returned. As a result, the interlocking rod 7 moves to the right by the force of the return spring 8, and the bearing 13-2 comes into contact with the high step portion of the release cam 9-2 of the half nut release device 9, and the half nut 13 contacts the feed screw 12. Since the release button 4-1 is returned while being engaged, the driving lever 6 of the interlocking holding arm 15 rotates counterclockwise to engage with the guide groove 5-2 of the support shaft 15-1. When the mating pin 6-2 moves to the right and the support shaft 15 moves to the right by the force of the spring 5-3, the holding arm 15 turns the flange portion to the sucker contact portion 3-2 of the slider 3. To hold it. The structure of the holding arm 15 is such that the support shaft 15-1 is attracted while rotating the support shaft 15-1 in the direction of the slider abutting surface of the slider by the force of the return spring 5-3. Can be held.

Further, by forming the tooth profile of the feed screw 12 to be a tooth profile inclined with respect to a plane perpendicular to the traveling direction of the screw, a screw having such a tooth profile can be manufactured by many manufacturing means. For example, when manufactured by rolling, high-precision screws can be manufactured at extremely low cost. On the other hand, when a load is applied, the half nut 13 is lifted up in the radial direction. However, as described above, the high step portion of the release cam 9-2 which presses the half nut 13 against the screw 12 is parallel to the screw. Since it is formed, the half nut 13 does not rise, and accurate feeding can be secured. In addition, if the tooth profile of the feed screw 12 is formed in a saw-tooth shape and the vertical surface of the tooth profile is set on the feed side, the half nut 13 can be prevented from floating even when a load is applied, and the manufacture of the screw is easy and inexpensive. There is a feature that can be manufactured.

[0019]

Since the infusion device according to the present invention has the above-mentioned structure, the operation of the slider release button facilitates and ensures the engagement and release between the slider and the feed screw, and the rotatable holding device. There is an effect that an infusion device having a holding device capable of holding the collar portion of the sucker against the slider by the arm can be provided at low cost.

[Brief description of the drawings]

FIG. 1A is a fragmentary sectional view showing a state after a collar portion of an absorptive member is held on a slider in a first embodiment of an infusion device according to the present invention.

FIG. 1B is a sectional view taken along line A-A ′ of FIG. 1A.

FIG. 2A is a fragmentary cross-sectional view showing a state before a collar portion of a suction piece is held on a slider in the first embodiment of the infusion device according to the present invention.

FIG. 2B is a sectional view taken along line A-A ′ of FIG. 2A.

FIG. 3A is a cross-sectional view of a main part showing a state before a collar portion of a suction piece is held on a slider in a second embodiment of the infusion device according to the present invention.

FIG. 3B is a sectional view taken along line A-A ′ of FIG. 3A.

FIG. 4A is a fragmentary sectional view showing a state after a collar portion of a sucker is held on a slider in a second embodiment of the infusion device according to the present invention.

FIG. 4B is a sectional view taken along line A-A ′ of FIG. 4A.

FIG. 5A is a cross-sectional view of a main part of a third embodiment of the infusion device according to the present invention, showing a state before the collar portion of the sucker is held on the slider.

FIG. 5B is a sectional view taken along line A-A ′ of FIG. 5A.

FIG. 6A is a fragmentary sectional view showing a state after a collar portion of a suction piece is held on a slider in a third embodiment of the infusion device according to the present invention.

FIG. 6B is a sectional view taken along line A-A ′ of FIG. 6A.

FIG. 7A is an explanatory diagram of a first example of an infusion device conventionally implemented.

FIG. 7B is a side view of the infusion device shown in FIG. 7A.

FIG. 8 is an explanatory view of a second example of a conventionally-used infusion device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Syringe 2 Suction piece 2-1 Flange part of a suction piece 3 Slider 3-2 Contact part of the end of a suction piece of a slider 3-5 Extension part of a slider 4 Slider release lever 4-1 Push button of slider release lever 2 Projection of release lever 4-3 Support shaft of release lever 5 Collar holding arm 5-1 Support shaft of holding arm 5-2 Return spring of holding arm 5.3 Projection of arm 6 Drive lever of holding arm 6-1 Drive Lever support shaft 6-2 Support shaft engagement pin 7 Interlocking rod 8 Return spring 9 Half nut release device 11 Half nut holding unit 11-1 Half nut sliding groove 11-3 Half nut release spring 12 Feed screw 13 Half nut 13-2 Half nut bearing 15 Holding arm 15-1 Support arm support shaft 15-2 Rotation guide groove of support shaft 15-3 Return bar of support arm

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-9-122239 (JP, A) JP-A-6-47092 (JP, A) JP-A-5-42215 (JP, A) JP-A-3-42215 114469 (JP, A) JP-A-3-247347 (JP, A) JP-A-10-33672 (JP, A) JP-A-6-57355 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) A61M 5/145

Claims (5)

(57) [Claims] An infusion device having a feed screw driven by a prime mover and configured to press a syringe sucker by a linearly movable slider engaged with the feed screw and to deliver a liquid to the syringe, wherein the liquid is delivered. A release lever pivotally supported by a first support shaft, a push button provided at one end of the release lever and protruding outside the slider, and a half nut provided at the other end for engaging with a feed screw A first mechanism comprising a portion for pressing one end of an interlocking rod extending in parallel with a feed screw interlocking with the release device, a first spring for restoring the interlocking rod, and an interlocking rod from the slider. A feed nut and a movable half-nut holding portion provided on an extension portion which is extended in parallel and integrally connected to the slider, and a half-nut slide perpendicular to the feed direction of the feed screw formed in the half-nut holding portion; A second mechanism comprising a groove, a half nut slidably inserted into the sliding groove and supported to be detachable from the feed screw, and a half nut releasing device fixed to the other end of the interlocking rod. The half nut releasing device comprises a release cam having a step in the advancing direction of the interlocking bar at a position facing a surface of the half nut opposite to the screw surface, and a half nut provided on the half nut holding portion in the release direction. And a second spring biasing the fluid. 2. A holding arm for pressing and holding a collar portion of a sucker on a slider is rotatably supported by a second support shaft provided at a different position in parallel with the first support shaft. , Third
2. A spring according to claim 1, wherein said spring is urged to rotate clockwise, and said release lever is provided with a projection which engages with a small projection provided at an end of said holding arm. Infusion device. 3. A holding arm for pressing and holding a collar portion of a sucker on a slider is supported by a support shaft so as to be movable and pivotable in a moving direction of the slider, and is interlocked with the release lever. When the holding arm is moved in a direction away from the slider, the holding arm is pivoted so that the holding arm separates from the flange of the sucker, and when the holding arm approaches the slider, the holding arm is The infusion device according to claim 1, wherein the support shaft is pivoted so as to engage with the flange portion. 4. The infusion device according to claim 1, wherein the tooth shape of the feed screw is a tooth shape inclined with respect to a plane perpendicular to the traveling direction of the screw. 5. The infusion device according to claim 1, wherein the tooth shape of the feed screw is a saw-like tooth shape.