JP5924019B2 - Semi-solid injection device - Google Patents

Description

The present invention relates to an injection device that can be preferably used when injecting a semi-solid material such as a nutrient into a patient or the like via a tube .

  Enteral nutrition therapy is known as a method of administering nutrition or a drug to a patient who is difficult to send food from the oral cavity to the stomach due to trauma of the esophagus or oral cavity, disease or surgery. In enteral nutrition therapy, a nutrient (generally, via a nasal catheter passed from the patient's nasal cavity to the stomach or duodenum, or a PEG (Percutaneous Endoscopic Gastrostomy) catheter inserted into a gastric fistula formed in the patient's abdomen, etc. Called “enteral nutrient”).

  If the nutrients administered in this enteral nutrition therapy are low-viscosity liquids, the nutrients may flow back from the stomach to the esophagus, causing pneumonia, and the nutrients may not be sufficiently absorbed by the body. There are problems such as.

  Therefore, in order to prevent the above problems, semi-solid products whose fluidity has been reduced (ie, whose viscosity has been increased) by adding a tromi or thickener to the nutrients are used in enteral nutrition therapy. Often.

  The container filled with the nutrient and the catheter inserted into the patient's body are connected by a flexible tube. When the nutrient becomes highly viscous, the resistance when the nutrient passes through the tube increases. Therefore, it is difficult to allow nutrients to flow into the patient's body using gravity.

  Therefore, an injection device has been proposed in which a roller is pressed against the outer surface of the tube connecting the container and the catheter, and the roller is rolled and moved from the container side to the patient side while crushing the tube with the roller (for example, Patent Document 1). According to such an injection device, the nutrient in the tube can be moved toward the patient as the roller moves. Therefore, even if the viscosity of the nutrient is increased, the nutrient can be administered to the patient. Moreover, the burden of the operator who administers the nutrient with increased viscosity to the patient is reduced.

JP 2009-226209 A

  However, the injection device of Patent Document 1 has the following problems.

  1stly, when mounting | wearing a tube with an injection device, there exists a problem that the mounting height of a tube tends to produce. In the above injection device, the three rollers are held by the rotor with their central axes parallel to the vertical direction, and the rotor rotates in a horizontal plane. Therefore, it is necessary to mount the tube at substantially the same height as the roller so that the tube is crushed by the outer peripheral surface of the roller. However, it is difficult to always attach the tube to the roller at a constant height, and in particular, there is a problem that the tube may be attached to a low position with respect to the roller due to the action of gravity. . If the tube is not mounted at an appropriate height, it will be difficult to crush the tube with a roller, so that nutrients cannot be injected by the injection device, and it is difficult to rotate the rotor holding the roller. Forcibly rotating this causes problems such as damage to the injection device.

  Secondly, there is a problem that an accident in which an operator pinches a finger by the cover of the injection device may occur. In the above injection device, a cover that covers the roller and the rotor is provided. The cover is opened and closed by rotating in the vertical plane. When the operator opens and closes the cover and puts the tube in and out of the infusion device, if the cover is accidentally tilted, the fingers will be caught in the cover that has fallen vigorously Accidents may occur.

  The present invention solves the above problems of conventional injection devices. That is, the first object of the present invention is to reduce the variation in the mounting height of the tube. The second object of the present invention is to prevent an upright cover from falling unexpectedly.

  A first injecting device of the present invention is a semi-solidified material injecting device for injecting a semi-solidified material via a pump tube, the rotor being rotatably mounted on a base, and the rotor A roller that is rotatably held on the base, and an arc-shaped pressure contact surface facing the rotor, and the distance between the pressure contact surface and the rotor is increased to a retracted position and a reduced advanced position on the base. And a pressure welding unit that is displaced by The pump tube can be disposed between the rotor and the pressure contact surface when the pressure contact unit is in the retracted position. By rotating the rotor in a state where the pressure contact unit is moved to the forward movement position, the roller is disposed between the pressure contact surface and the pump tube disposed between the rotor and the pressure contact surface. It rolls and moves on the pump tube while being crushed. The injection device includes a support structure that supports the pump tube so that the pump tube is not disposed at a position lower than the pressure contact surface and the roller when the pressure contact unit is in the retracted position. It is further provided in the area between the rollers.

A second injection device according to the present invention is a semi-solidified material injection device for injecting a semi-solid material via a pump tube, the rotor rotatably mounted on a base, and the rotor A roller that is rotatably held on the base, and an arc-shaped pressure contact surface facing the rotor, and the distance between the pressure contact surface and the rotor is increased to a retracted position and a reduced advanced position on the base. And a pressure welding unit that is displaced by The pump tube can be disposed between the rotor and the pressure contact surface when the pressure contact unit is in the retracted position. By rotating the rotor in a state where the pressure contact unit is moved to the forward movement position, the roller is disposed between the pressure contact surface and the pump tube disposed between the rotor and the pressure contact surface. It rolls and moves on the pump tube while being crushed. The injection device has an engagement structure that engages with both end portions of the pump tube so that the pump tube is not disposed at a position lower than the pressure contact surface and the roller when the pressure contact unit is in the retracted position. In addition. The engagement structure that engages with one end of the pump tube is different from the engagement structure that engages with the other end of the pump tube.

  A third injection device of the present invention is a semi-solid material injection device for injecting a semi-solid material via a pump tube, the rotor being rotatably mounted on a base, and the rotor A roller that is rotatably held on the base, and an arc-shaped pressure contact surface facing the rotor, and the distance between the pressure contact surface and the rotor is increased to a retracted position and a reduced advanced position on the base. And a cover that is rotatably attached to the base and covers a gap between the rotor and the pressure contact surface. When the cover is lifted and opened, the press contact unit moves to the retracted position, and when the cover is lowered and closed, the press contact unit moves to the advanced position so that the press contact unit is interlocked with the cover. . The pump tube can be disposed between the rotor and the pressure contact surface when the pressure contact unit is in the retracted position. By rotating the rotor in a state where the pressure contact unit is moved to the forward movement position, the roller is disposed between the pressure contact surface and the pump tube disposed between the rotor and the pressure contact surface. It rolls and moves on the pump tube while being crushed. The injection device further includes a fall prevention mechanism for restricting the lifted cover from lowering due to its own weight.

  According to the first and second injection devices of the present invention, when the pressure contact unit is in the retracted position, the pump tube is mounted on the injection device so that the pump tube is substantially level with the pressure contact surface and the roller. Can do.

  According to the third injection device of the present invention, it is possible to prevent the upright cover in the open state from falling unexpectedly.

FIG. 1 is a perspective view of an injection device according to an embodiment of the present invention with a cover opened. FIG. 2 is a perspective view of an injection device according to an embodiment of the present invention with the cover closed and not in use. FIG. 3A is a perspective view seen from the front side of the main part of the injection apparatus according to the embodiment of the present invention with the cover opened. FIG. 3B is a partially cutaway perspective view seen from the back side of the main part of the injection apparatus according to the embodiment of the present invention with the cover opened. FIG. 4 is a perspective view of the main part of the injection device according to the embodiment of the present invention with the cover closed. FIG. 5 is a perspective view of the injection device according to the embodiment of the present invention as viewed from above in a state where the cover is opened. FIG. 6 is a configuration diagram of an example of a nutrient transport route when performing enteral nutrition therapy. FIG. 7 is a perspective view of an injection device according to an embodiment of the present invention just before the cover is opened and the pump tube is attached. FIG. 8A is a perspective view of an injection device according to an embodiment of the present invention with a cover open and a pump tube attached. FIG. 8B is a plan view of an infusion device according to one embodiment of the present invention with the cover open and the pump tube attached. FIG. 9A is a perspective view of an infusion device according to an embodiment of the present invention with a pump tube attached and a cover closed. FIG. 9 is a perspective plan view of an infusion device according to an embodiment of the present invention with a pump tube attached and a cover closed. FIG. 10 is a perspective view of an injection device according to an embodiment of the present invention in which a pump tube is attached and a huddle is attached to a rotor shaft. FIG. 11 is a cross-sectional view of an injection device according to an embodiment of the present invention with the cover open. FIG. 12 is an enlarged perspective view of the slider crank mechanism of the injection device according to the embodiment of the present invention with the cover opened. FIG. 13 is an enlarged cross-sectional view showing the contact surface of the slider link rib and the cover in a state where the cover is opened in the injection device according to the embodiment of the present invention. FIG. 14A is an enlarged cross-sectional view showing a state in which the cover is slightly inclined and the ribs of the slider link and the contact surface of the cover are in contact with each other in the injection device according to the embodiment of the present invention. FIG. 14B is a perspective view of the injection device according to the embodiment of the present invention in which the cover is inclined slightly and the rib of the slider link and the contact surface of the cover contact each other. FIG. 15 is an enlarged cross-sectional view showing the contact surface between the rib of the slider link and the cover when the cover is closed in the injection device according to the embodiment of the present invention.

  A first injecting device of the present invention is a semi-solidified material injecting device for injecting a semi-solidified material via a pump tube, the rotor being rotatably mounted on a base, and the rotor A roller that is rotatably held on the base, and an arc-shaped pressure contact surface facing the rotor, and the distance between the pressure contact surface and the rotor is increased to a retracted position and a reduced advanced position on the base. And a pressure welding unit that is displaced by The pump tube can be disposed between the rotor and the pressure contact surface when the pressure contact unit is in the retracted position. By rotating the rotor in a state where the pressure contact unit is moved to the forward movement position, the roller is disposed between the pressure contact surface and the pump tube disposed between the rotor and the pressure contact surface. It rolls and moves on the pump tube while being crushed. The injection device includes a support structure that supports the pump tube so that the pump tube is not disposed at a position lower than the pressure contact surface and the roller when the pressure contact unit is in the retracted position. It is further provided in the area between the rollers.

  In the first injection device, the support structure may be provided on the base. Thereby, a support structure can be provided by a slight design change.

  In this case, the support structure may be a protrusion formed on the base. Thereby, a support structure can be provided without increasing the number of parts.

  Alternatively, the support structure may be provided on the rotor. Alternatively, the support structure may be provided in the press contact unit.

A second injection device according to the present invention is a semi-solidified material injection device for injecting a semi-solid material via a pump tube, the rotor rotatably mounted on a base, and the rotor A roller that is rotatably held on the base, and an arc-shaped pressure contact surface facing the rotor, and the distance between the pressure contact surface and the rotor is increased to a retracted position and a reduced advanced position on the base. And a pressure welding unit that is displaced by The pump tube can be disposed between the rotor and the pressure contact surface when the pressure contact unit is in the retracted position. By rotating the rotor in a state where the pressure contact unit is moved to the forward movement position, the roller is disposed between the pressure contact surface and the pump tube disposed between the rotor and the pressure contact surface. It rolls and moves on the pump tube while being crushed. The injection device has an engagement structure that engages with both end portions of the pump tube so that the pump tube is not disposed at a position lower than the pressure contact surface and the roller when the pressure contact unit is in the retracted position. In addition. The engagement structure that engages with one end of the pump tube is different from the engagement structure that engages with the other end of the pump tube.

  In the second injection device of the present invention, the engagement structure may be provided on the base. Thereby, the engagement structure can be provided by a slight design change.

Engaging structure that engages one end of the pump tube, the engagement structure for engaging the other end of the pump tube that have different shapes. Thereby, it is possible to prevent the occurrence of an accident that the pump tube is mounted in the injection device with the direction of the pump tube reversed.

  The engagement structure engaged with one end of the pump tube or the vicinity thereof may be different from the engagement structure engaged with the other end of the pump tube or the vicinity thereof. Thereby, it is possible to reduce the occurrence of an accident in which the direction of the pump tube is reversed and attached to the injection device.

  A third injection device of the present invention is a semi-solid material injection device for injecting a semi-solid material via a pump tube, the rotor being rotatably mounted on a base, and the rotor A roller that is rotatably held on the base, and an arc-shaped pressure contact surface facing the rotor, and the distance between the pressure contact surface and the rotor is increased to a retracted position and a reduced advanced position on the base. And a cover that is rotatably attached to the base and covers a gap between the rotor and the pressure contact surface. When the cover is lifted and opened, the press contact unit moves to the retracted position, and when the cover is lowered and closed, the press contact unit moves to the advanced position so that the press contact unit is interlocked with the cover. . The pump tube can be disposed between the rotor and the pressure contact surface when the pressure contact unit is in the retracted position. By rotating the rotor in a state where the pressure contact unit is moved to the forward movement position, the roller is disposed between the pressure contact surface and the pump tube disposed between the rotor and the pressure contact surface. It rolls and moves on the pump tube while being crushed. The injection device further includes a fall prevention mechanism for restricting the lifted cover from lowering due to its own weight.

  The third injection device of the present invention may further include a slider crank mechanism that interlocks the pressure-contact unit with the cover. In this case, the fall prevention mechanism can be provided in the slider crank mechanism. Thereby, the fall prevention mechanism can be provided with a simple configuration.

  It is preferable that the fall prevention mechanism includes two different members that collide with each other. Thereby, the fall prevention mechanism can be provided with a simple configuration.

  Below, this invention is demonstrated in detail, showing suitable embodiment. However, it goes without saying that the present invention is not limited to the following embodiments. For convenience of explanation, the drawings referred to in the following description show only the main members necessary for explaining the present invention in a simplified manner among the constituent members of the embodiment of the present invention. Therefore, the present invention can include arbitrary components not shown in the following drawings. In addition, the dimensions of the members in the following drawings do not faithfully represent the actual dimensions of the constituent members and the dimensional ratios of the members.

(Schematic configuration of injection device)
1 and 2 are perspective views of an injection device 1 according to an embodiment of the present invention. FIG. 1 shows a state where the cover 20 is opened, and FIG. 2 shows a non-use state where the cover 20 is closed from the state shown in FIG. For convenience of the following description, as shown in the drawing, an XYZ orthogonal coordinate system is set with the vertical axis as the Z axis and the horizontal axis orthogonal to the Z axis as the X axis and the Y axis. The Z-axis direction is referred to as “vertical direction”, the Z-axis arrow side is referred to as “upper side”, and the opposite side is referred to as “lower side”. The X-axis direction is referred to as “front-rear direction”, the arrow side of the X-axis is referred to as “front side”, and the opposite side is referred to as “rear side”.

  The injection device 1 includes a base 10 and a cover 20. As shown in FIG. 1, a rotation shaft 50 parallel to the Y axis is fixed to the base 10. The cover 20 is connected to the base 10 via the rotation shaft 50. The cover 20 can be rotated around the rotation shaft 50 within an angle range slightly larger than 90 degrees in a vertical plane parallel to the XZ plane. In the present invention, the state in which the cover 20 stands upright almost vertically as shown in FIG. 1 is called the “open state” or “upright state” of the cover 20, and the state in which the cover 20 lies in the horizontal direction as shown in FIG. This is called the “closed state” of the cover 20. A cover lock mechanism 11 that engages with the cover 20 in the closed state is provided on the base 10. As shown in FIG. 2, a handle 25 is detachably held on the cover 20.

  A rotor 30 is provided on the base 10 so as to be rotatable in a horizontal plane. The rotor 30 includes a rotor shaft that protrudes in the vertical direction. A rotor shaft (not shown) protruding downward is supported by the base 10, and a rotor shaft 31 protruding upward is supported by and passed through a bearing holder 12 fixed to the base 10. When the cover 20 is in the closed state, the rotor shaft 31 further penetrates the closed cover 20 and protrudes upward from the cover 20 (see FIG. 2). A portion of the rotor shaft 31 protruding from the cover 20 is splined. The rotor shaft 31 includes a known ratchet mechanism (not shown). When the rotor shaft 31 is rotated in the clockwise direction when viewed from above, the ratchet mechanism transmits the rotational torque input to the rotor shaft 31 and the rotor 30 rotates in the clockwise direction. On the other hand, when the rotor shaft 31 is rotated counterclockwise as viewed from above, the ratchet mechanism cuts off this rotational torque and the rotor 30 does not rotate. However, unlike the present embodiment, the ratchet mechanism may be configured to transmit only the rotational torque in the counterclockwise direction, or the ratchet mechanism may be omitted.

  3A and 3B are perspective views of the main part of the injection device 1 with the cover 20 in an open state (see FIG. 1). FIG. 3B also shows a cross section along a plane parallel to the XZ plane. FIG. 4 is a perspective view of the main part of the injection device 1 with the cover 20 in the closed state (see FIG. 2). 3A, 3B, and 4, illustration of the base 10, the bearing holder 12, the cover 20, the handle 25, and the like is omitted.

  The rotor 30 includes a pair of disk-shaped flanges 32a and 32b that face each other in the vertical direction. Three rollers 33 having a cylindrical outer peripheral surface are held between the flanges 32a and 32b. The three rollers 33 are arranged at equiangular intervals with respect to the rotor shaft 31 of the rotor 30. The roller 33 is installed at a position in the vicinity of the outer peripheral edges of the flanges 32a and 32b so that a part of the outer peripheral surface of the roller 33 protrudes radially outward from the outer peripheral edges of the flanges 32a and 32b. The roller 33 is freely rotatable about its central axis parallel to the Z axis.

  A pressure contact unit 40 is provided facing the rotor 30 in the front-rear direction (X-axis direction). The press contact unit 40 includes a base 41, a support part 42 and a press contact part 43 mounted on the base 41. The support portion 42 is fixed to the base 41 with two screws 49a (one of the two screws 49a is not visible). The position of the support portion 42 with respect to the base 41 in the X-axis direction can be adjusted by loosening the screws 49a. The pressure contact portion 43 includes a pressure contact surface 44 on the side facing the rotor 30. The pressure contact surface 44 is an arc-shaped concave curved surface (that is, a part of a cylindrical surface), and the center of the pressure contact surface 44 is when the pressure contact unit 40 is in the forward position (refer to FIG. 4, details will be described later). It coincides with the rotation center axis. In the vertical direction (Z-axis direction), the pressure contact surface 44 and the cylindrical outer peripheral surface of the roller 33 are disposed at substantially the same height.

  As shown in FIG. 3B, the press contact portion 43 is penetrated by two screws 49b parallel to the X-axis direction (one of the two screws 49b is not visible) and two screws 49b. Further, the support portion 42 is connected via two compression coil springs 49c (one of the two compression coil springs 49c is not visible). When the injection device 1 is not in use, as shown in FIGS. 3A, 3B, and 4, the pressure contact portion 43 and the support portion 42 are slightly separated in the X-axis direction. In this state, when a backward force along the X-axis direction (direction toward the support portion 42) is applied to the pressure contact surface 44 of the pressure contact portion 43, the two compression coil springs 49c are elastically compressed, and the pressure contact portion 43 is The base 41 is displaced in the direction of the support portion 42.

  3A, 3B, and 4 show a rotation shaft 50 that is a shaft on which the cover 20 rotates. Further, a first connection shaft 51 and a second connection shaft 52 that are parallel to the rotation shaft 50 are shown. The rotating shaft 50 and the first connecting shaft 51 are connected via a pair of cover links 53, and the first rotating shaft 51 and the second rotating shaft 52 are connected via a slider link 54. The second connecting shaft 52 is fixed to the base 41 of the press contact unit 40. The cover link 53 is rotatable with respect to the rotation shaft 50 and the first connection shaft 51, and the slider link 54 is rotatable with respect to the first connection shaft 51 and the second connection shaft 52. Thus, the rotating shaft 50, the first connecting shaft 51, the second connecting shaft 52, the cover link 53, and the slider link 54 constitute a slider crank mechanism having the rotating shaft 50 as a fixed shaft.

  As shown in FIG. 1, the pair of cover links 53 are fixed to the cover 20. Therefore, when the cover 20 is rotated around the movable shaft 50, the cover link 53 is also rotated around the rotational shaft 50. As a result, the first connecting shaft 51 rotates around the rotating shaft 50 via the cover link 53, and the second connecting shaft 52 reciprocates in the X-axis direction via the slider link 54. Accordingly, the compression unit 40 reciprocates in the X-axis direction on the base 10 in conjunction with the opening / closing operation of the cover 20. When the cover 20 is lifted to the open state (see FIG. 1), as shown in FIGS. 3A and 3B, the pressure contact unit 40 moves backward with respect to the rotor 30 and moves to the “retracted position” to lower the cover 20. In the closed state (see FIG. 2), the press contact unit 40 approaches the rotor 30 and moves to the “advance position” as shown in FIG. When the pressure contact unit 40 is in the retracted position, the distance between the pressure contact surface 44 and the rotor 30 is increased (maximum), and when the pressure contact unit 40 is in the advanced position, the space between the pressure contact surface 44 and the rotor 30 is increased. The interval is reduced (minimized).

  As shown in FIG. 5, the base 10 has an upstream receiving portion 13 for holding the upstream end of the pump tube, and a downstream receiving portion 14 for holding the downstream end of the pump tube. Is formed. In FIG. 5, illustration of the cover 20, the handle 25, and the like is omitted.

(How to use the injection device)
A case where the method of using the injection device 1 of Embodiment 1 is used for enteral nutrition therapy will be described as an example.

  FIG. 6 is a configuration diagram of an example of a nutrient transport route when performing enteral nutrition therapy. The nutrient is stored in the container 120. Reference numeral 131 denotes a connector (female connector) provided at the upstream end of a catheter (for example, a nasal catheter or a PEG catheter) inserted into a patient. A port (male connector) 121 provided at the lower end of the container 120 and a catheter connector 131 are connected by an extension tube 100. The extension tube 100 includes a female connector 107 connected to the port 121 at one end (upstream end) and a male connector 109 connected to the connector 131 at the other end. Reference numeral 110 denotes a flexible pump tube. A first part 111 and a second part 112 made of a hard material are attached to both ends of the pump tube 110. The first part 111 of the pump tube 110 and the female connector 107 are connected by a flexible first tube 101. The second part 112 of the pump tube 110 and the male connector 109 are connected by a flexible second tube 102. On the first tube 101, a clamp 103 that opens and closes the flow path in the first tube 101 is provided. A pump tube 110 is attached to the injection device 1 of the present invention. The material of the pump tube 110 is not particularly limited, and rubber, polyvinyl chloride, polypropylene, polybutadiene, polyurethane, silicone, and polyethyl acetate are used, and among these, polyvinyl chloride is particularly preferably used. FIG. 6 shows an example in which the nutrient is stored in a container 120 made of a hard material. However, the container for storing the nutrient is arbitrary, for example, a bag-like container (so-called pouch) made of a flexible material. ). Moreover, the structure of the extension tube with which the injection apparatus of this invention is mounted | worn is not limited to the thing of FIG.

  FIG. 7 is a perspective view showing a state immediately before the pump tube 110 is attached to the injection device 1 with the cover 20 opened. The pressure contact unit 40 is in a retracted position retracted with respect to the rotor 30, and the distance between the pressure contact surface 44 and the rotor 30 is increased. The pump tube 110 is bent in a substantially U shape and is inserted into the gap between the rotor 30 and the pressure contact surface 44. The first part 111 on the upstream side of the pump tube 110 is fitted into the upstream receiving part 13 of the base 10, and the second part 112 on the downstream side is fitted into the downstream receiving part 14 of the base 10 (mounting process). FIG. 8A is a perspective view showing a state in which the pump tube 110 is attached to the injection device 1, and FIG. 8B is a plan view thereof. In FIG. 8B, illustration of the cover 20, the handle 25, etc. is omitted.

  Next, the cover 20 is rotated about the rotation shaft 50 to close the cover 20. As described above, the compression unit 40 approaches the rotor 30 in conjunction with the rotation of the cover 20 and moves to the advance position. As a result, the pump tube 110 is sandwiched between the pressure contact surface 44 of the compression unit 40 and the roller 33 of the rotor 30 and is elastically compressed in the radial direction. By pressing the cover 20 downward toward the base 10, the cover lock mechanism 11 provided on the base 10 is engaged with the cover 20, and the cover 20 is locked in the closed state. Unless the engagement between the cover lock mechanism 11 and the cover 20 is released, the cover 20 does not open unintentionally due to the elastic recovery force of the pump tube 110. FIG. 9A is a perspective view of the injection device 1 with the pump tube 110 attached and the cover 20 closed, and FIG. 9B is a plan view thereof. In FIG. 9B, illustration of the cover 20, the handle 25, etc. is omitted so that the internal structure can be understood.

  Next, the handle 25 is removed from the cover 20 and attached to the rotor shaft 31 protruding from the cover 20 as shown in FIG. A hole (not shown) into which the rotor shaft 31 of the handle 25 is inserted is subjected to spline processing that fits into the spline processing formed on the rotor shaft 31.

  In FIG. 10, when the handle 25 is rotated in the direction of arrow R (clockwise as viewed from above), the rotor 30 is also rotated in the direction of arrow R. As a result, the three rollers 33 provided on the rotor 30 roll on the pump tube 110 from the first part 111 side to the second part 112 side while crushing the pump tube 110 with the pressure contact surface 44. Move in order. In the portion crushed between the roller 33 and the pressure contact surface 44 of the pump tube 110, the lumen through which the nutrient in the pump tube 110 flows is substantially closed. This crushed portion moves as the roller 33 rolls. On the downstream side (second part 112 side) from the crushed portion, the nutrient in the pump tube 110 is pushed out to the second part 112 side. On the upstream side (the first part 111 side) from the crushed portion, the nutrient flows into the pump tube 110 due to the negative pressure when the pump tube 110 is elastically recovered. Thus, by rotating the handle 25 in the direction of the arrow R, the pump tube 110 can be squeezed and the nutrient in the container 120 can be sent out toward the connector 131 of the catheter (infusion process). The cover 20 covers the rotor 30, the pressure contact unit 40, and the gap between them. Accordingly, it is possible to prevent an accident that a finger is accidentally pinched in a gap between the rotor 30 and the pressure contact unit 40 when the rotor 30 is rotated. When the handle 25 is rotated with one hand (for example, the right hand), the outer surface of the cover 20 is shaped so that the other surface (for example, the left hand) can stably hold the outer surface of the cover 20. Yes.

  When the internal pressure in the pump tube 110 rises abnormally, the compression coil spring 49c (see FIG. 3B) is elastically compressed, and the pressure contact portion 43 is slightly displaced in a direction away from the rotor 30. Thereby, the space | interval of the press-contact surface 44 and the rotor 30 expands slightly, and the abnormal pressure rise in the pump tube 110 is relieved. Furthermore, the compression coil spring 49c can be deformed according to dimensional variations such as the wall thickness of the pump tube 110, so that a nutrient can be stably injected into a plurality of types of pump tubes 110 having different standards. it can.

  When the injection of the nutrient to the patient is completed, the rotation of the handle 25 is stopped. Thereafter, the pump tube 110 can be detached from the injection device 1 by performing the reverse operation to the above.

(Pump tube mounting height variation reduction means)
In the injection device 1 of the present embodiment, the nutrient solution is moved by crushing the pump tube 110 between the pressure contact surface 44 and the roller 33. Accordingly, when the pressure contact unit 40 is in the retracted position (see FIG. 7), the pump tube 110 is arranged so that the pump tube 110 is substantially level with the pressure contact surface 44 and the roller 33 in the vertical direction (Z-axis direction). It must be attached to the injection device 1.

  The injection device 1 of the present embodiment includes two means for realizing this.

  The first means abuts on and supports the pump tube 110 to prevent the pump tube 110 from dropping from a desired position.

  FIG. 11 is a cross-sectional view of the injection apparatus 1 with the cover 20 in the open state along a plane parallel to the XZ plane passing through the rotor shaft 31. In FIG. 11, illustration of the cover 20, the handle 25, and the like is omitted to simplify the drawing.

  In FIG. 11, the press contact unit 40 is in a retracted position separated from the rotor 30. The pressure contact surface 44 of the pressure contact portion 43 and the outer peripheral surface of the roller 33 of the rotor 30 are disposed at substantially the same height and face each other. The pump tube 110 is inserted into the gap between the pressure contact surface 44 and the roller 33 (see FIGS. 8A and 8B). In the present embodiment, two ribs 15 protruding upward are formed in a region on the base 10 between the pressure contact surface 44 and the roller 33. The top portion (the highest portion) of the rib 15 is substantially the same height as the press contact surface 44 and the lower end of the roller 33.

  A slit 45 into which the rib 15 enters is formed in the base 41 so that the base 41 of the pressure welding unit 40 does not collide with the rib 15 when the pressure welding unit 40 moves to the advance position close to the rotor 30. (See FIG. 5).

  When the pressure contact unit 40 is in the retracted position, the rib 15 appears in a region on the base 10 between the pressure contact surface 44 and the rotor 30. When the pump tube 110 is attached to the injection device 1, the rib 15 supports the pump tube 110, so that the pump tube 110 is not disposed at a position lower than the pressure contact surface 44 and the roller 33. Therefore, after that, if the cover 20 is closed and the pressure contact unit 40 is moved to the advanced position, the pump tube 110 is reliably compressed between the pressure contact surface 44 and the roller 33.

  In the above embodiment, when the pressure contact unit 40 is in the retracted position, the two ribs 15 are used as a support structure for supporting the pump tube 110 so that the pump tube 110 is not disposed at a position lower than the pressure contact surface 44 and the roller 33. Although used, it is not limited to the above embodiment as long as it can have the same function.

  For example, the support structure may be a protrusion having an arbitrary shape such as a semi-cylindrical shape, a hemispherical shape, or a rectangular parallelepiped shape instead of the upright plate-like rib 15. The number of the protrusions need not be two, and may be one or three or more.

  The support structure need not be a protrusion formed on the upper surface of the base 10. For example, the outer diameter of the lower flange 32b constituting the rotor 30 is made larger than the outer diameter of the upper flange 32a, and the lower flange 32b protrudes outward in the radial direction from the outer peripheral surface of the roller 33. You may let them. In this case, the portion of the lower flange 32b protruding in the radial direction functions as a support structure that supports the pump tube 110 at a desired height.

  Alternatively, the base 41 of the press contact unit 40 may be protruded from the press contact surface 44 toward the rotor 30. In this case, the portion of the base 41 that protrudes from the compression surface 44 functions as a support structure that supports the pump tube 110 at a desired height.

  When the lower flange 32b and the base 41 are protruded as described above, it is necessary to have a structure in which the compression unit 40 and the rotor 30 do not collide when the compression unit 40 is moved to the advanced position. There is.

  The second means prevents excessive pumping of the pump tube 110 between the upstream receiving portion 13 and the downstream receiving portion 14, thereby preventing the pump tube 110 from dropping from a desired position. .

  As described above, the pump tube 110 is curved so that the pump tube 110 is wound around the rotor 30, and the first part 111 and the second part 112 at both ends of the pump tube 110 are upstream of the base 10. The receiving device 13 and the downstream receiving portion 14 are fitted into the injection device 1. If the portion of the pump tube 110 between the upstream side receiving portion 13 and the downstream side receiving portion 14 is too long, the pump tube 110 is loosened and falls downward.

  Therefore, an engagement structure for engaging the first part 111 and the second part 112 is provided in the upstream side receiving part 13 and the downstream side receiving part 14 so as to reduce the fall of the pump tube 110 due to the talmi. Yes.

  That is, as shown in FIG. 5, the upstream receiving portion 13 is provided with a groove 13a into which the disk-shaped flange 111a (see FIG. 7) protruding outward in the radial direction of the first part 111 is fitted. It has been.

  Further, as shown in FIG. 5, the downstream receiving portion 14 has a substantially cylindrical outer peripheral surface of the second part 112 because the outer diameter of the second part 112 is larger than the outer diameter of the pump tube 110. A rib-like protrusion 14a is provided that engages with a stepped portion 112a (see FIG. 7) formed at the end on the pump tube 110 side.

  The flange 111a of the first part 111 is engaged with the groove 13a of the upstream receiving portion 13, and the stepped portion 112a of the second part 112 is engaged with the protrusion 14a of the downstream receiving portion 14 (see FIG. 8B). The length between the flange 111a and the stepped portion 112a of the pump tube 110 is such that the portion of the pump tube 110 between the upstream side receiving portion 13 and the downstream side receiving portion 14 when the pump tube 110 is mounted in this way. Is set appropriately so that it does not become too long. Therefore, it is possible to reduce the tarmi of the pump tube 110. As a result, the pump tube 110 is not disposed at a position lower than the pressure contact surface 44 and the roller 33 when the pressure contact unit 40 is in the retracted position.

  The engagement structure provided in each of the upstream receiving portion 13 and the downstream receiving portion 14 is not limited to the above embodiment. Depending on the shape of the first part 111 and the second part 112 at both ends of the pump tube 110, the shape and size of the engagement structure provided in the upstream side receiving part 13 and the downstream side receiving part 14 can be appropriately changed.

  Although the engagement structure provided in the upstream receiving part 13 and the engagement structure provided in the downstream receiving part 14 may be the same, it is preferable that they are different as in the above embodiment. As a result, even if the pump tube 110 is to be installed in reverse, at least one of inserting the second part 112 into the upstream receiving portion 13 and inserting the first part 111 into the downstream receiving portion 14. Is impossible. Therefore, it is possible to prevent the occurrence of an accident in which nutrients are caused to flow backward by attaching the pump tube 110 to the injection device 1 with the direction of the pump tube 110 reversed.

  When the rotor 30 is rotated and the roller 33 rolls and moves on the pump tube 110, the pump tube 110 receives a force in the direction in which the roller 33 moves from the roller 33. Accordingly, a large force acts on the engaging portion between the upstream receiving portion 13 and the first part 111. When the engagement structure is different between the upstream receiving portion 13 and the downstream receiving portion 14, the area of the engaging portion between the upstream receiving portion 13 and the first part 111 is set to the downstream side as in the above embodiment. Making it larger than the area of the engaging part of the receiving part 14 and the 2nd part 112 is advantageous at the point which opposes this force.

  The same color (first color) is applied to the upstream side receiving portion 13 and the first part 111 inserted therein, and the same color (the same color is assigned to the downstream side receiving portion 14 and the second part 112 inserted therein) ( 2nd color), and the first color applied to the upstream receiving portion 13 and the first part 111 is different from the second color applied to the downstream receiving portion 14 and the second part 112. Good. Thereby, the operator can use the colors attached to the upstream receiving part 13 and the downstream receiving part 14 on the injection apparatus 1 side, and the colors attached to the first part 111 and the second part 112 on the pump tube 110 side. It can be easily understood through vision that the pump tube 110 may be attached to the infusion apparatus 1 so that the two match. Therefore, it is possible to prevent the occurrence of an accident that the pump tube 110 is mounted in the injection device 1 with the direction of the pump tube 110 reversed. In the above description, both the first color and the second color may be omitted, and either one of the colors may be omitted (that is, the color of the material itself may be kept). In this case, the same effect as described above can be obtained. For example, the upstream receiving portion 13 and the first part 111 inserted into the upstream receiving portion 13 may be colored yellow, and the downstream receiving portion 14 and the second part 112 inserted therein may not be colored. The coloring method is not particularly limited, and a known method such as a method of mixing a color pigment in the material, a method of applying a paint after molding, or a method of sticking a sheet having a desired color can be appropriately selected.

  The injection device 1 of this embodiment includes both a support structure (rib 15) that supports the pump tube 110 and an engagement structure that engages with the first and second parts 111 and 112 at both ends of the pump tube 110. However, either one may be omitted, and even in that case, the pump tube 110 can be mounted at a desired height.

(Cover falling prevention means)
When the pump tube 110 is attached to or removed from the infusion apparatus 1, the cover 20 is erected almost vertically as shown in FIGS. If the upright cover 20 falls down unexpectedly, an accident such as pinching a finger between the cover 20 and the base 10 may occur.

  The injection device 1 of the present embodiment includes means for preventing the upright cover 20 from falling down.

  As shown in FIG. 3B, a rib 56 is formed on the outer peripheral surface of the slider link 54 on the side facing the cover 20. The rib 56 is a protrusion extending in parallel with the Y-axis direction.

  FIG. 12 is an enlarged perspective view of the slider crank mechanism including the slider link 54 with the cover 20 open. A pair of cover links 53 are attached to a pair of contact surfaces 23 provided on the cover 20. Each contact surface 23 protrudes in the Y-axis direction on the other contact surface 23 side from the cover link 53 attached to the contact surface 23.

  FIG. 13 is an enlarged cross-sectional view showing the rib 56 of the slider link 54 and the contact surface 23 of the cover 20 when the cover 20 is in the open state (upright state). The rib 56 and the contact surface 23 are separated from each other. From this state, in order to close the cover 20, the cover 20 is rotated clockwise around the rotation axis 50.

  FIG. 14A shows a state where the cover 20 is slightly rotated from FIG. Together with the cover 20, the contact surface 23 is also slightly rotated in the clockwise direction. Further, since the first rotation shaft 51 is slightly rotated around the rotation shaft 50, the slider link 54 is slightly rotated counterclockwise. As a result, the contact surface 23 of the cover 20 and the rib 56 of the slider link 54 collide. FIG. 14B is a perspective view of the injection device 1 in this state. As can be understood by comparison with FIG. 1, the cover 20 is slightly inclined. Since the contact surface 23 and the rib 56 collide with each other, the cover 20 cannot be rotated further only by its own weight.

  In the state of FIG. 14B, when an external force is applied to the cover 20 to close the cover 20, the rib 56 of the slider link 54 slides on the contact surface 23 while pressing the contact surface 23 of the cover 20. 20 can be further rotated.

  FIG. 15 is an enlarged cross-sectional view showing the rib 56 of the slider link 54 and the contact surface 23 of the cover 20 when the cover 20 is closed. The rib 56 and the contact surface 23 are separated from each other.

  Contrary to the above, when the cover 20 in the closed state shown in FIG. 15 is lifted, the contact surface 23 of the cover 20 and the rib 56 of the slider link 54 immediately before reaching the open state as described in FIG. 14A. collide. When the cover 20 is further lifted, the rib 56 of the slider link 54 presses against the contact surface 23 of the cover 20 and slides on the contact surface 23 in the opposite direction to the above, and the cover 20 is opened (see FIG. 1 and FIG. 13).

  As described above, in the present embodiment, the abutting surface 23 of the cover 20 and the rib 56 of the slider link 54 collide with each other in the process in which the cover 20 is displaced between the open state and the closed state. Therefore, even if some external force acts on the upright cover 20 in the open state and starts to rotate around the rotation shaft 50, the contact surface 23 and the rib 56 collide with each other (see FIG. 14A). The rotation stops (see FIG. 14B). Thereby, the possibility that the upright cover 20 falls down unintentionally and an accident such as pinching a finger between the cover 20 and the base 10 occurs is reduced.

  Further, when opening the cover 20 in the closed state, the contact surface 23 of the cover 20 and the rib 56 of the slider link 54 collide in the middle of reaching the open state. The operator feels a change in the lifting force of the cover 20 due to the collision between the contact surface 23 and the rib 56 as a click feeling. If the cover 20 is further lifted after confirming this click feeling, the cover 20 will be in a safe state that will not fall under its own weight. Thus, the operator can easily determine whether or not the cover 20 is in a state where the cover 20 cannot fall down due to its own weight, based on a change in the operation force for rotating the cover 20, so that the operator can feel at ease. Increase.

  In the above-described embodiment, the fall prevention mechanism for restricting the lifted cover 20 from falling due to its own weight is provided so as to collide with each other, and the abutment surface 23 of the cover 20 and the rib of the slider link 54 However, the structure of the fall prevention mechanism is not limited to this. For example, any two members constituting the slider crank mechanism may be provided with a shape that exerts some kind of interaction such as collision or friction in the process in which the cover 20 is displaced between the open state and the closed state. Moreover, you may provide the shape which gives a certain interaction in 2 members (for example, the cover 20 and the base 10) other than the member which comprises a slider crank mechanism.

  The fall prevention mechanism can be configured using an action other than an interaction such as a collision or friction between two different members. For example, the fall prevention mechanism may be configured using an elastic member such as a spring. An elastic member can be provided so as to suppress a relative displacement between two or more members that occurs in the process in which the cover 20 is displaced from the open state to the closed state. For example, the tension coil spring can be bridged between the rotating shaft 50 and the second connecting shaft 52. Alternatively, the torsion coil spring can be mounted on the first connecting shaft 51 with its coil shaft attached to both ends of the rotating shaft 50 and the second connecting shaft 52. The type and mounting position of the elastic member are not limited to these and can be changed as appropriate. The fall prevention mechanism can also be configured by combining an interaction such as collision or friction between two different members and an elastic member such as a spring.

  The injection device 1 of the above embodiment includes both the means for reducing variation in the mounting height of the pump tube 110 and the means for preventing the cover 20 from falling, but either one may be omitted.

  In the above embodiment, the press contact unit 40 includes the base 41, the support portion 42, and the press contact portion 43, but the support portion 42 and the press contact portion 43 may be integrated. The support part 42 may be integrated, or the base 41, the support part 42, and the press contact part 43 may be integrated.

  In said embodiment, although the semi-solidified nutrient was demonstrated to the example as a semi-solidified material, the injection apparatus of this invention can be utilized also for the semisolid-solidified material other than a nutrient. The viscosity of the semi-solidified material suitable for the injection apparatus of the present invention is not particularly limited, but is preferably 1000 mPa · s or more, for example. The upper limit of the viscosity of the semi-solidified material varies depending on the mechanical properties of the pump tube 110 and the like, but is generally preferably 50000 mPa · s or less.

  The application field of the present invention is not particularly limited, but can be used as an injection device used in the medical field. For example, it can be used as an injection device for injecting a low-fluidity semi-solid fluid such as a nutrient, a contrast medium, or hyaluronic acid into a patient. In particular, it can be preferably used for enteral nutrition therapy in which a semi-solid nutrient is injected through a catheter inserted into a patient's body. However, the injection device of the present invention is not limited to the medical field, and can be widely used in fields where semi-solidified products need to be injected (for example, food fields, general industrial fields, etc.).

1 Injection device 10 Base 13a Groove (engagement structure)
14a Protrusion (engagement structure)
15 Ribs (support structure)
20 Cover 23 Contact surface (falling prevention mechanism)
30 Rotor 33 Roller 40 Pressure unit 44 Pressure surface 50 Rotating shaft (slider crank mechanism)
51 First connecting shaft (slider crank mechanism)
52 Second connecting shaft (slider crank mechanism)
53 Cover link (slider crank mechanism)
54 Slider link (slider crank mechanism)
56 Rib (Falling prevention mechanism)
110 Pump tube

Claims (12)

A semi-solid injection device for injecting a semi-solid through a pump tube,
A rotor mounted rotatably on the base;
A roller rotatably held by the rotor;
An arc-shaped pressure contact surface facing the rotor, and a pressure contact unit that is displaced on the base at a retracted position in which a gap between the pressure contact surface and the rotor is expanded and a contracted forward position;
When the pressure contact unit is in the retracted position, the pump tube can be disposed between the rotor and the pressure contact surface,
By rotating the rotor in a state where the pressure contact unit is moved to the forward movement position, the roller is disposed between the pressure contact surface and the pump tube disposed between the rotor and the pressure contact surface. Roll over the pump tube while crushing,
The injection device includes a support structure that supports the pump tube so that the pump tube is not disposed at a position lower than the pressure contact surface and the roller when the pressure contact unit is in the retracted position. An apparatus for injecting a semi-solid product, further comprising a region between the rollers.   The semi-solidified material injection device according to claim 1, wherein the support structure is provided on the base.   The semi-solidified material injection device according to claim 1, wherein the support structure is a protrusion formed on the base.   The semi-solidified material injection device according to claim 1, wherein the support structure is provided in the rotor.   The semi-solidified material injection device according to claim 1, wherein the support structure is provided in the pressure contact unit. A semi-solid injection device for injecting a semi-solid through a pump tube,
A rotor mounted rotatably on the base;
A roller rotatably held by the rotor;
An arc-shaped pressure contact surface facing the rotor, and a pressure contact unit that is displaced on the base at a retracted position in which a gap between the pressure contact surface and the rotor is expanded and a contracted forward position;
When the pressure contact unit is in the retracted position, the pump tube can be disposed between the rotor and the pressure contact surface,
By rotating the rotor in a state where the pressure contact unit is moved to the forward movement position, the roller is disposed between the pressure contact surface and the pump tube disposed between the rotor and the pressure contact surface. Roll over the pump tube while crushing,
The injection device has an engagement structure that engages with both end portions of the pump tube so that the pump tube is not disposed at a position lower than the pressure contact surface and the roller when the pressure contact unit is in the retracted position. In addition,
A semi-solid injection device, wherein the engagement structure engaged with one end of the pump tube and the engagement structure engaged with the other end of the pump tube have different shapes.   The semi-solid injection device according to claim 6, wherein the engagement structure is provided on the base.   8. The semi-solidified product according to claim 6, wherein the color of the engagement structure engaged with one end of the pump tube or the vicinity thereof and the engagement structure engaged with the other end of the pump tube or the vicinity thereof are different. Injection device. A semi-solid injection device for injecting a semi-solid through a pump tube,
A rotor mounted rotatably on the base;
A roller rotatably held by the rotor;
A pressure contact unit that has an arc-shaped pressure contact surface facing the rotor, and is displaced on the base between a retracted position in which a gap between the pressure contact surface and the rotor is expanded and a contracted forward position;
A cover that is rotatably attached to the base and covers a gap between the rotor and the pressure contact surface;
When the cover is lifted and opened, the press contact unit moves to the retracted position, and when the cover is lowered and closed, the press contact unit moves to the advance position so that the press contact unit is interlocked with the cover. ,
When the pressure contact unit is in the retracted position, the pump tube can be disposed between the rotor and the pressure contact surface,
By rotating the rotor in a state where the pressure contact unit is moved to the forward movement position, the roller is disposed between the pressure contact surface and the pump tube disposed between the rotor and the pressure contact surface. Roll over the pump tube while crushing,
The injection device further includes a fall prevention mechanism for restricting the lifted cover from lowering due to its own weight. A slider crank mechanism for interlocking the press contact unit with the cover;
The semi-solidified material injection device according to claim 9 , wherein the fall prevention mechanism is provided in the slider crank mechanism. The semi-solidified injection device according to claim 9 or 10 , wherein the fall prevention mechanism includes two different members that collide with each other. The semi-solidified injection device according to claim 9 or 10 , wherein the fall prevention mechanism includes an elastic member.

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