JP2019072261A - Tube transfusion mechanism - Google Patents

Abstract

To provide a tube transfusion mechanism capable of surely transfusing a liquid through a transfusion tube.SOLUTION: A cassette 2 for the tube transfusion mechanism comprises: a housing 21; a rotary table 231 contained in the housing 21 and rotatable on a first rotary shaft J1; a compressing member 24 mounted on the rotary table 231; and a transfusion tube 25 which transfuses the liquid contained therein when compressed by the compressing member 24. An apparatus body 3 includes a rotary shaft member 322 detachably linked to the rotary table 231, and the rotary table 231 includes a through-hole 231a through which the rotary shaft member 322 is inserted and a support shaft member 232. The compressing member 24 is arranged to abut the rotary shaft member 322, which rotary shaft member 322 is arranged to extend through the through-hole 231a. The compressing member moves radially along a slot 242 while abutting the rotary shaft member 322 in such a manner as to compress the transfusion tube 25 against an inner surface 201a of the housing 21.SELECTED DRAWING: Figure 4

Description

  BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to a tube delivery mechanism including an infusion tube through which a liquid inside is delivered.

  BACKGROUND Conventionally, a so-called cassette-type infusion device is known as an infusion device including an infusion tube into which an internal liquid is fed (see, for example, Patent Document 1). The cassette-type infusion device is capable of detaching the cassette containing the rotor and the infusion tube from the device body, and is excellent in portability and maintainability. The rotor and the infusion tube constitute a tube delivery mechanism.

  The rotor of the infusion device described in Patent Document 1 includes a housing and a plurality of roller members disposed along the circumferential direction. A portion of the infusion tube is disposed along the inner surface of the housing between the housing and the outer periphery of the plurality of roller members, and the liquid medicine (liquid) inside the infusion tube is pressed by the plurality of roller members and fed. Ru.

  A through hole is provided at the center of the housing of the tube liquid feeding mechanism described in Patent Document 1 in order to insert the motor rotation shaft inside a plurality of roller members arranged along the circumferential direction. When the cassette is attached to the apparatus main body, the motor rotation shaft is inserted into the through hole from the rear surface of the housing so that the motor rotation shaft is brought into contact with the inner circumferential surfaces of the plurality of roller members.

  The infusion device configured as described above rotates the motor rotation shaft portion in a state where the motor rotation shaft member inserted into the through hole is in contact with the plurality of roller members, thereby rotating the motor rotation shaft portion and the plurality of rollers The frictional force between the members causes the plurality of roller members to rotate. Then, the plurality of roller members crush and squeeze the flexible infusion tube, and thereby the liquid medicine (liquid) inside the infusion tube is fed so as to be injected into the patient's body.

JP 2012-2158 A

  However, in the infusion device described in Patent Document 1, when the force applied by the roller member exceeds the infusion tube exceeds the frictional force between the motor rotation shaft portion and the roller member, the motor rotation shaft portion slips and the roller member In some cases, the liquid medicine (liquid) inside the infusion tube can not be fed.

  An object of the present invention is to provide a tube delivery mechanism capable of reliably delivering a liquid in an infusion tube.

  The present invention is a tube liquid feeding mechanism for use in an infusion apparatus comprising a cassette and an apparatus main body capable of attaching and detaching the cassette, wherein the cassette is accommodated inside a housing and the housing, and the first rotation is performed. A rotary table rotatable about an axis, a pressing member disposed on the rotary table, and a portion disposed along the inner surface of the housing between the housing and the outer periphery of the pressing member; A liquid infusion tube which is pressed by a member to feed liquid therein, and the apparatus main body is capable of rotating the rotary table about the first rotary shaft and is detachable from the rotary table A rotary shaft member which is connected in a possible manner, and the rotary table includes a through hole through which the rotary shaft member is inserted, and the rotary table And the pressing member has an elongated hole extending in the radial direction of the rotary table and into which the support shaft is inserted, and the rotating shaft member is inserted into the through hole. The insertion tube is disposed in contact with the rotary shaft member by being disposed, and is moved in the radial direction of the rotary table along the elongated hole in a state of being in contact with the rotary shaft member to move the infusion tube The present invention relates to a tube liquid feeding mechanism disposed in a state of being pressed against the inner surface of the housing.

  Moreover, it is preferable that the said pressing member is several roller members which can each autorotate centering | focusing on the 2nd rotating shaft parallel to a said 1st rotating shaft.

  Preferably, the rotary shaft member is detachably fitted to and connected to the rotary table.

  According to the present invention, it is possible to provide a tube delivery mechanism capable of reliably delivering the liquid in the infusion tube.

It is a front view showing an infusion device concerning one embodiment of the present invention. It is a front view which shows the cassette which can be mounted | worn with the apparatus main body. It is a front view which shows the apparatus main body at the time of removing a cassette from the infusion device. It is the sectional view on the AA line of Drawing 1, and is a sectional view showing the state where a motor axis of rotation part was fitted to a cassette. It is an exploded perspective view of a cassette. It is a perspective view which shows the structure which a cassette and a motor rotating shaft part fit. It is a perspective view which shows the structure which a cassette and a motor rotating shaft part fit. It is sectional drawing which shows the operation | movement in the case of fitting a motor rotating shaft part to a cassette. It is a top view which shows the operation | movement in the case of fitting a motor rotating shaft part to a cassette. It is a figure explaining the operation | movement which liquid-feeds the inside of the infusion tube in a cassette.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a front view showing an infusion device 1 according to an embodiment of the present invention. FIG. 2 is a front view showing the cassette 2 mountable to the apparatus main body 3. FIG. 3 is a front view showing the device main body 3 when the cassette 2 is removed from the infusion device 1. FIG. 4 is a cross-sectional view taken along the line A-A of FIG. 1 and is a cross-sectional view showing a state in which the motor rotation shaft portion 322 is fitted to the cassette 2. FIG. 5 is an exploded perspective view of the cassette 2. 6A and 6B are perspective views showing a configuration in which the cassette 2 and the motor rotation shaft 322 are fitted. FIG. 7 is a cross-sectional view showing an operation in the case where the motor rotary shaft is fitted to the cassette. FIG. 8 is a plan view showing an operation in the case where the motor rotary shaft is fitted to the cassette. FIG. 9 is a view for explaining the operation of feeding the liquid in the infusion tube 25 in the cassette 2.

  As shown in FIGS. 1 to 3, the infusion device 1 is a so-called cassette type infusion device including a cassette 2 and an apparatus main body 3 to which the cassette 2 can be attached and detached. The tube liquid transfer mechanism of the present embodiment is used for the infusion device 1. In the present embodiment, the direction perpendicular to the top surface of the apparatus main body 3 is referred to as “vertical direction”.

First, the device body 3 will be described.
As shown in FIG. 3, the device body 3 includes a case body 31, a motor 32 as a drive unit, and a touch panel 33.

  The case body 31 constitutes the outer shape of the apparatus main body 3. The case body 31 has an upper surface and a lower surface formed in a planar shape, and one end side in the longitudinal direction is formed in an arc shape and the other end side in the longitudinal direction is formed in a rectangular shape. Inside the case body 31, the motor 32, a battery (not shown), a control circuit (for example, a CPU and various electronic components) and the like (not shown) are accommodated.

  The case body 31 has a cassette receiving recess 311, as shown in FIG. The cassette 2 (see FIG. 2) is attached to the cassette accommodation recess 311. The cassette accommodation recess 311 is formed in a concave shape which is recessed downward at one end side of the case body 31 in the longitudinal direction. A cassette removal button 312 for removing the cassette 2 from the case body 31 is disposed in the vicinity of the cassette accommodation recess 311 on the upper surface of the case body 31.

  The motor 32 is, as shown in FIGS. 3 and 4, a motor main body 321 disposed in the lower part of the cassette housing recess 311 in the case body 31 and a rotary shaft member projecting upward from the bottom surface of the cassette housing recess 311. And the motor rotary shaft portion 322 of FIG.

  The motor 32 is connected to the cassette 2 in a state where the cassette 2 is mounted to the apparatus body 3. The motor 32 transmits the rotational drive force to a rotor 22 (see FIG. 1) of the cassette 2 described later via the motor rotation shaft 322 to rotate the rotor 22 of the cassette 2.

  When the cassette 2 is attached to the apparatus main body 3, the motor rotation shaft portion 322 is disposed so as to penetrate a table through hole 231a of the rotation table 231 described later, as shown in FIG. The motor rotary shaft portion 322 is disposed so as to project upward from the upper surface of the rotary table 231 when the motor rotary shaft portion 322 is arranged to penetrate through a table through hole 231 a of the rotary table 231 described later. In the present embodiment, the length in the vertical direction of the motor rotation shaft portion 322 is formed to the same extent as the height of three roller members 24 described later when the cassette 2 is mounted on the apparatus main body 3 . When the cassette 2 is attached to the apparatus main body 3, the outer peripheral surface of the motor rotation shaft portion 322 abuts on the inner portions of three roller members 24 described later. Thus, the motor rotary shaft 322 presses the three roller members 24 outward in the radial direction of the rotary table 231.

  As shown in FIG. 4, a fitting horizontal member 323 is attached midway on the lower side in the direction of the first rotation shaft J1 in the motor rotation shaft portion 322. The fitting cross member 323 extends in a direction intersecting the direction in which the motor rotation shaft 322 extends. The fitting horizontal member 323 is disposed in the middle of the lower side in the direction of the first rotation shaft J1 in the motor rotation shaft portion 322 so as to penetrate the motor rotation shaft portion 322 in the direction intersecting the first rotation shaft J1 direction.

  The fitting horizontal member 323 can be fitted to the motor shaft fitting portion 233 on the lower surface of the rotary table 231 of the rotor 22 of the cassette 2 described later. The motor rotation shaft portion 322 is detachably fitted and coupled to the rotation table 231 of the base rotation member 23 by the fitting horizontal member 323 being fitted to the motor shaft fitting portion 233. As a result, the motor rotation shaft portion 322 rotates around the first rotation shaft J1 by the rotational drive force of the motor 32, whereby the rotation table 231 of the base rotation member 23, which will be described later, is centered on the first rotation shaft J1. It is possible to rotate.

  The touch panel 33 is disposed on the top surface of the case body 31 as shown in FIG. The touch panel 33 functions as a display unit and an operation unit. The touch panel 33 displays information such as the flow rate of the liquid (blood, drug solution, etc.) flowing through the infusion tube 25. The touch panel 33 includes an ON / OFF button of the motor 32, a button for inputting a flow rate of the infusion supplied by the cassette 2, and the like.

Next, the cassette 2 which is removable from the apparatus body 3 will be described.
The cassette 2 is detachably mounted to the cassette receiving recess 311 (see FIG. 3) of the apparatus main body 3. As shown in FIGS. 2 and 5, the cassette 2 includes a cassette housing 21 as a housing, a rotor 22, and an infusion tube 25. The rotor 22 is detachably coupled to the motor rotation shaft 322 (see FIG. 4) of the motor 32 when the cassette 2 is attached to the apparatus body 3. In the present embodiment, the cassette housing 21, the rotor 22, the infusion tube 25, and the motor 32 constitute a tube delivery mechanism.

  The cassette housing 21 is formed to have a predetermined thickness by combining the upper casing 211 and the lower casing 212 as shown in FIGS. 2, 4 and 5. The cassette housing 21 has, in a plan view, a circular portion 201 disposed on one side in the longitudinal direction, and an extending portion 202 disposed in connection with the circular portion 201 on the other side in the longitudinal direction. The rotor 22 is disposed inside the cassette housing 21.

  As shown in FIG. 5, the circular portion 201 of the lower casing 212 is formed with a housing opening 21a which is opened in the vertical direction. As shown in FIG. 4, a motor shaft fitting portion 233 formed on the lower surface of the base rotation member 23 of the rotor 22 is disposed inside the housing opening 21 a. In the housing opening 21 a, the motor shaft fitting portion 233 formed on the lower surface of the base rotation member 23 of the rotor 22 is exposed below the cassette 2.

  The rotor 22 is accommodated in a circular portion 201 in the interior of the cassette housing 21 as shown in FIGS. 4 and 5. The rotor 22 has a base rotation member 23 and three roller members 24 (pressing members) that can rotate independently.

  The base rotation member 23 includes a rotation table 231, three roller support shaft members 232 (support shaft portions), a motor shaft fitting portion 233, and an annular protrusion 237 surrounding the motor shaft fitting portion 233. Have.

  As shown in FIG. 4, the rotary table 231 is formed in a disk shape, and is configured to be rotatable around the first rotation axis J1. The first rotation axis J1 extends in the vertical direction at the center of the rotary table 231. At the center of the rotary table 231, a table through hole 231a through which the motor rotation shaft portion 322 is inserted is formed. The motor rotation shaft portion 322 of the motor 32 is disposed to penetrate the table through hole 231a.

  The three roller support shaft members 232 are erected upward from the upper surface of the rotary table 231. Each of the three roller support shaft members 232 is formed to extend in the direction of the second rotation axis J2, and supports each of the plurality of roller members 24 individually rotatably around the second rotation axis J2. The second rotation axis J2 extends parallel to the first rotation axis J1. The three roller support shaft members 232 are circumferentially arranged at predetermined positions in the radial direction of the rotary table 231 on the upper surface of the rotary table 231. The roller support shaft member 232 positions the roller member 24 on the rotary table 231 by inserting a shaft support elongated hole 242 (long hole) (described later) of the roller member 24 in the roller support shaft member 232.

The annular protrusion 237 protrudes downward from the lower surface of the rotary table 231 in an annular wall shape, as shown in FIG.
The motor shaft fitting portion 233 is disposed on the lower surface of the rotary table 231 inside the annular projecting portion 237. The motor rotation shaft portion 322 of the motor 32 is fitted to the motor shaft fitting portion 233.

  As shown in FIG. 6A, the motor shaft fitting portion 233 is formed by four circular arc-shaped convex portions 234 protruding downward from the lower surface of the rotary table 231 and four circularly-shaped convex portions 234. And the groove 235.

  Each of the four arc-shaped convex portions 234 is formed in an arc shape in plan view. The four arc-shaped convex portions 234 are annularly arranged side by side in the circumferential direction. A table through hole 231 a is formed inside the four arc-shaped convex portions 234. The table through hole 231 a is formed to penetrate in the vertical direction at the center of the rotary table 231. As shown in FIG. 6A, when fitting the motor rotation shaft 322 to the motor shaft fitting portion 233, the motor rotation shaft 322 of the motor 32 is inserted through the table through hole 231a.

  Each of the four arc-shaped convex portions 234 has a flat portion 234a parallel to the lower surface of the rotary table 231 and a sloped portion 234b extending in the circumferential direction from the flat portion 234a toward the rotary table 231. And. In the arcuate convex portion 234, as shown in FIG. 6B, when fitting the motor rotation shaft 322 to the motor shaft fitting portion 233, the fitting horizontal member 323 attached to the motor rotation shaft 322 is: It slides in the circumferential direction along the slope part 234b and is moved.

  The four fitting grooves 235 are arranged in a cross shape across the table through holes 231a. When fitting the motor rotation shaft 322 to the fitting groove 235 in the motor shaft fitting 233, the fitting lateral is moved by sliding the sloped portion 234b of the arcuate convex portion 234 in the circumferential direction. The member 323 fits in.

  The three roller members 24 are disposed on the rotary table 231 of the base rotary member 23 as shown in FIGS. 2 and 5. The three roller members 24 are each formed in a cylindrical shape with a bottom. Each of the three roller members 24 is capable of rotating about the second rotation axis J2. The three roller members 24 are arranged circumferentially at predetermined positions in the radial direction on the upper surface of the rotary table 231.

  Each of the three roller members 24 is pivotally supported by the roller support shaft member 232 (support shaft) of the base rotation member 23. Each of the three roller members 24 has a pivotally supported long hole 242 (long hole) formed in the center of the bottom plate. The axially supported elongated hole 242 is formed in the shape of an elongated hole extending in the radial direction of the rotary table 231. The roller support shaft member 232 is inserted into the axially supported long hole 242. Thus, the roller member 24 is configured to be movable in the radial direction of the rotary table 231 along the axially supported elongated hole 242.

  Each of the three roller members 24 is disposed by inserting the motor rotation shaft portion 322 into the table through hole 231 a of the rotation table 231, so that the motor rotation shaft portion 322 is in contact with the inside of the three roller members 24. It is arranged in contact. Each of the three roller members 24 is disposed in the axially supported long hole 242 in a state of being in contact with the motor rotation shaft portion 322 by the motor rotation shaft portion 322 being inserted through the table through hole 231 a of the rotation table 231. The infusion tube 25 is moved along the radial direction of the rotary table 231 to press the infusion tube 25 against the inner circumferential surface 201a of the cassette housing. In the present embodiment, by appropriately setting the length of the pivotally supported elongated hole 242 and the diameter of the roller support shaft member 232, the amount of movement of the three roller members 24 in the radial direction of the rotary table 231 is set. it can. Specifically, by axially moving the three roller members 24 in the radial direction of the rotary table 231 so that the three roller members 24 can press the infusion tube 25 against the inner peripheral surface 201 a of the cassette housing, the axially supported long hole 242 And the diameter of the roller support shaft member 232 are set. In the present embodiment, the ratio of the length of the axially supported elongated hole 242 to the size of the diameter of the roller support shaft member 232 is affected by the thickness, material, and elasticity (stretching degree) of the infusion tube pressed by the roller member. Although it may adjust suitably, Preferably it is 1.1-3.0, More preferably, it is 1.3-2.0. The three roller members 24 rotate about the first rotation axis J1 while being pressed against the infusion tube 25 as the base rotation member 23 rotates. Further, the three roller members 24 rotate on the second rotation axis J2 while being pressed against the infusion tube 25 respectively.

  The infusion tube 25 is connected on the upstream side to a drip bag (not shown) filled with a liquid (blood, drug solution, etc.), and on the downstream side is connected to the patient. As shown in FIG. 2, a portion of the infusion tube 25 is disposed along the inner peripheral surface (inner surface) 201 a of the cassette housing 21 between the cassette housing 21 and the outer periphery of the three roller members 24. The infusion tube 25 is, for example, a tube made of silicon.

  As the rotation table 231 of the base rotation member 23 of the rotor 22 rotates and the three roller members 24 rotate, the infusion tube 25 is pressed by the three roller members 24 and a liquid inside is fed. Specifically, the infusion tube 25 is disposed to surround the outer sides of the three roller members 24. The infusion tube 25 is radially crushed by being pressed by the roller member 24 against the inner peripheral surface 201 a of the cassette housing 21 between the three roller members 24 and the inner peripheral surface 201 a of the cassette housing 21. The infusion tube 25 is squeezed by the rotating roller member 24 as the rotary table 231 of the base rotary member 23 of the rotor 22 rotates and the three roller members 24 rotate. Thereby, the infusion tube 25 delivers the liquid (blood, drug solution, etc.) inside.

  In the infusion device 1 configured as described above, when the cassette 2 is attached to the apparatus main body 3, as shown in FIGS. 6A and 6B, the tip of the motor rotation shaft portion 322 is a table through hole of the rotation table 231. The fitting lateral member 323 is fitted in the fitting groove 235 by sliding the fitting lateral member 323 attached to the motor rotation shaft part 322 in the circumferential direction along the slope part 234b while being inserted into the 231a. Thus, the motor rotation shaft portion 322 is fitted to the motor shaft fitting portion 233 of the rotation table 231 of the rotor 22.

  At the same time, as shown in FIGS. 7 and 8, the three roller members are inserted by inserting the motor rotary shaft portion 322 of the motor 32 into the table through hole 231a of the rotary table 231 of the base rotary member 23 of the rotor 22 of the cassette 2. Place it inside 24. As a result, the three roller members 24 are moved in the radial direction of the rotary table 231 along the axially supported elongated holes 242, and are disposed in a state where the infusion tube 25 is pressed against the inner circumferential surface 201a of the cassette housing.

  Then, the motor 32 is driven by operating the touch panel 33 in a state where the cassette 2 is attached to the apparatus main body 3. Thus, as the motor rotation shaft 322 rotates, as shown in FIG. 9, the rotary table 231 of the rotor 22 fitted to the motor rotation shaft 322 rotates about the first rotation shaft J1. In this state, the outer peripheral surfaces of the three roller members 24 abut on the infusion tube 25 at the outer peripheries of the three roller members 24.

  Since the infusion tube 25 abuts on the outer periphery of the three roller members 24, the three roller members 24 rotate around the infusion tube 25 as the inner periphery of the cassette housing 21 when the rotary table 231 rotates about the first rotation axis J 1. In a state where it is pressed against the surface 201a, it is rotated about the first rotation axis J1 while rotating about the second rotation axis J2 by the frictional force with the infusion tube 25. Thereby, the liquid in the infusion tube 25 is fed by the infusion tube 25 being crushed and squeezed in order from the upstream side to the downstream side. In addition, since the three roller members 24 rotate automatically, the frictional resistance between the roller member 24 and the infusion tube 25 is reduced, so the wear of the infusion tube 25 is reduced. Thereby, the durability of the infusion tube 25 can be improved.

According to the tube liquid feeding mechanism relating to the present embodiment, the following effects are exhibited.
In the tube liquid feeding mechanism of the present embodiment, the cassette 2 is housed in the cassette housing 21 and the inside of the cassette housing 21 and is disposed on the rotary table 231 rotatable on the first rotary shaft J1 and the rotary table 231. Between the cassette member 21 and the outer periphery of the roller member 24 and disposed along the inner peripheral surface 201a of the cassette housing 21 and pressed by the roller member 24 so that the internal liquid is fed The apparatus main body 3 includes a motor rotation shaft portion 322 detachably connected to the rotation table 231. The rotation table 231 has a table through hole 231a through which the motor rotation shaft portion 322 is inserted. And a roller support shaft member 232 for positioning the roller member 24 on the rotary table 231, The roller member 24 has an axially extending elongated hole 242 which extends in the radial direction of the rotary table 231 and into which the roller support shaft member 232 is inserted, and the motor rotation shaft portion 322 is disposed by being inserted through the table through hole 231a. Therefore, the infusion tube 25 is moved in the radial direction of the rotary table 231 along the pivotally supported long hole 242 in a state of being in contact with the motor rotation shaft portion 322 and in contact with the rotation shaft member 322. It arrange | positions in the state which pressed on the internal peripheral surface 201a.

  Therefore, by connecting the motor rotary shaft portion 322 to the rotary table 231, the rotary table 231 can be rotated without slipping, so that the roller member 24 can be reliably rotated. Further, the infusion tube 25 is moved to the inner circumferential surface 201 a of the cassette housing 21 while moving the roller member 24 along the pivotally supported long hole 242 by inserting the motor rotary shaft portion 322 into the table through hole 231 a of the rotary table 231. Since the pressure can be applied, the infusion tube 25 can be stably pressed against the inner circumferential surface 201 a of the cassette housing 21 while adjusting the pressing force of the infusion tube 25. Therefore, the infusion tube 25 can not be crushed until the cassette 2 is attached to the device body 3, and the liquid inside the infusion tube 25 can be fed except the device body 3 (for example, infusion) The liquid inside the tube 25 can be fed at a pressure drop). On the other hand, when the cassette 2 is attached to the apparatus main body 3, the rotary table 231 can be reliably rotated in a state where the roller member 24 is stably pressed to the infusion tube 25, so the liquid inside the infusion tube 25 is stably and reliably It can be fed.

  Further, in the present embodiment, the roller members 24 are each capable of rotating around the second rotation axis J2. As a result, the roller member 24 is pressed by the infusion tube 25 and rotates on its own as the rotary table 231 rotates. Therefore, since the infusion tube 25 can be sifted while the roller member 24 rotates, the liquid in the infusion tube 25 can be more reliably fed. In addition, since the plurality of roller members 24 rotate, the frictional resistance between the roller member 24 and the infusion tube 25 is reduced, and the durability of the infusion tube 25 can be improved.

  Further, in the present embodiment, the motor rotation shaft portion 322 is detachably fitted to and connected to the rotation table 231. Therefore, the motor rotation shaft portion 322 can be easily connected to the rotation table 231 only by fitting the motor rotation shaft portion 322 to the rotation table 231. Further, since the motor rotation shaft portion 322 and the rotation table 231 are connected by fitting, the rotational driving force of the motor rotation shaft portion 322 can be transmitted to the rotation table 231 with certainty.

The present invention is not limited to the above-described embodiment, and modifications, improvements, and the like as long as the object of the present invention can be achieved are included in the present invention.
In the said embodiment, although the pressing member was comprised with the roller member and the roller member was made autorotatable, it is not limited to this. The pressing member may be, for example, a non-rotating fan-shaped member having a circular arc surface, and the fan-shaped member may press the infusion tube without rotating.

1 Infusion Device 2 Cassette 3 Device Body 21 Cassette Housing (Housing)
24 Roller member (pressing member)
25 infusion tube 201a inner circumferential surface (inner surface)
231 Rotary table 231a Table through hole (through hole)
232 Roller Support Shaft (Support Shaft)
242 Long hole (long hole)
322 Motor rotary shaft (rotary shaft member)
J1 1st axis of rotation J2 2nd axis of rotation

Claims (3)

What is claimed is: 1. A tube feeding mechanism for use in an infusion device comprising: a cassette; and an apparatus main body capable of attaching and detaching the cassette,
The cassette is
With the housing,
A rotary table housed inside the housing and rotatable about a first rotation axis;
A pressing member disposed on the rotary table;
An infusion tube, a part of which is disposed along the inner surface of the housing between the housing and the outer periphery of the pressing member, and pressed by the pressing member to feed the liquid therein;
The device body is
The rotary table may be rotated about the first rotary shaft, and the rotary table may be detachably coupled to the rotary table.
The rotary table has a through hole through which the rotary shaft member is inserted, and a support shaft portion for positioning the pressing member on the rotary table.
The pressing member has an elongated hole which extends in the radial direction of the rotary table and into which the support shaft portion is inserted, and the rotary shaft member is inserted into the through hole and disposed, thereby the rotary shaft member A tube which is disposed in contact and is moved in the radial direction of the rotary table along the elongated hole in a state of being in contact with the rotary shaft member so as to press the infusion tube against the inner surface of the housing Liquid transfer mechanism.   The tube feeding mechanism according to claim 1, wherein the pressing member is a plurality of roller members that can rotate on the second rotation axis parallel to the first rotation axis.   The tube liquid feeding mechanism according to claim 1 or 2, wherein the rotating shaft member is detachably fitted and coupled to the rotary table.

Images