JPWO2019146741A1 - Clamp - Google Patents

Abstract

The first arm and the second arm are connected via the first elastic portion (51) so that the first arm (10) can swing with respect to the second arm (20). The engaging convex portion (33) is provided on the operating portion (30) that can be displaced with respect to the first arm. An engaging structure (45) with which the engaging protrusions can be engaged is provided on the second arm. With the engaging convex portion engaged to the engaging structure, the engaging position of the engaging convex portion with respect to the engaging structure is the first position where the first arm and the second arm do not block the flow path of the tube (90). (P1) and the second position (P2) in which the first arm and the second arm block the flow path of the tube can be switched.

Description

The present invention relates to a clamp used to open and close the flow path of a flexible infusion tube.

In the medical field, infusion solutions in which drugs, nutritional components, electrolytes, etc. are administered intravenously to patients are widely used. The container that stores the infusion solution to be administered to the patient (hereinafter referred to as the "infusion bag") and the needle punctured in the patient's vein are connected by a flexible infusion tube (hereinafter referred to as the "tube"). An infusion pump is used to administer the infusion to the patient at the desired rate and timing. An infusion pump generally includes a pump body provided with a liquid feeding mechanism and a door that can be opened and closed with respect to the pump body. As a liquid feeding mechanism, for example, a peristaltic type in which a plurality of fingers sequentially crush the tube in the radial direction and a roller type in which a roller crushes the tube in the radial direction and moves along the longitudinal direction of the tube are known. .. Open the door and secure the tube to the pump body. When the door is closed, the tube is sandwiched between the liquid delivery mechanism (eg, finger or roller) and the door and crushed in the radial direction. When the liquid feeding mechanism is driven in this state, liquid feeding is started (see, for example, Patent Document 1).

If the tube is not attached to the infusion pump, or if the door is opened with the tube attached to the infusion pump, the infusion in the infusion bag will flow through the tube to the patient due to gravity (this is "free". Flow "). In order to prevent this, the tube is generally provided with a roller type clamp for opening and closing the flow path of the tube. However, if the operation of blocking the flow path of the tube with a clamp is forgotten, the above-mentioned free flow will occur.

Patent Document 2 describes a clamp used by being attached to a tube in order to prevent free flow (that is, anti-free flow). The clamp includes a main base, an elastically deformed portion, and an elastic portion. The elastic portion connects the main base portion and the elastically deformed portion so that the elastically deformed portion can swing with respect to the main base portion. At the end opposite to the elastic portion of the main base portion, a sub-base portion extending elastically from the main base portion so as to be elastically deformable is provided. A first engaging portion and a second engaging portion are provided at the tip of the elastically deformed portion. The sub-base portion is provided with a first groove portion and a second groove portion. In the natural state, the first and second engaging portions do not engage the first and second groove portions, and the clamp can be attached to and detached from the tube. When the tube is inserted between the main base and the elastically deformed portion and the second engaging portion is engaged with the second groove portion, the tube is separated from the clamp in a state where the flow path is secured (open state). You will not be able to. Further, when the first engaging portion is engaged with the first groove portion, the main base portion and the elastically deformed portion are in a closed state in which the flow path of the tube is blocked.

The clamp and the tube are fixed to the pump body of the infusion pump in a state where the first engaging portion is engaged with the first groove portion (the tube is closed). When the door is closed, the engagement between the first engaging portion and the first groove portion is released in conjunction with this, and instead, the second engaging portion engages with the second groove portion, and the tube is operated by the infusion pump. It is in an open state where liquid can be sent. After that, when the door is opened, the engagement between the second engaging portion and the second groove portion is released in conjunction with this, and instead, the first engaging portion engages with the first groove portion and the tube is closed. Switch to the state. The tube and clamp can be removed from the pump body while the tube remains closed.

As described above, the clamp opens the tube only when the tube is attached to the pump body of the infusion pump and the door is closed, so that the above free flow can be prevented. is there.

JP-A-2007-167316 Japanese Unexamined Patent Publication No. 2004-073822 (second embodiment, FIGS. 11 to 15)

In the clamp of Patent Document 2, an engaging structure for maintaining the open state (second engaging portion and the second groove portion) and an engaging structure for maintaining the closed state (first engaging portion and the first groove portion) ) And are provided separately. Therefore, the structure of the clamp is complicated.

An object of the present invention is to provide a clamp having a simple structure, which is a clamp capable of switching the flow path of the infusion tube between an open state and a closed state while being attached to the infusion tube.

The clamp of the present invention can open and close the flow path of the infusion tube while being attached to the infusion tube. The clamp includes a first arm and a second arm for closing the flow path of the infusion tube, and the first arm and the second arm so that the first arm can swing with respect to the second arm. An elastically bendable first elastic portion connecting the arm and an elastically deformable second elastic portion at an end opposite to the first elastic portion of the first arm, An operating portion displaceable with respect to the first arm, an engaging convex portion provided on the operating portion, and an end opposite to the first elastic portion of the second arm. It has an engaging structure in which the engaging convex portion can be engaged. In a state where the engaging convex portion is engaged with the engaging structure, the engaging position of the engaging convex portion with respect to the engaging structure is determined by the first arm and the second arm in the flow path of the infusion tube. It is possible to switch between a first position that does not block and a second position where the first arm and the second arm block the flow path of the infusion tube.

The clamp of the present invention includes an engaging convex portion on the first arm side and an engaging structure on the second arm side. By attaching the clamp to the infusion tube and engaging the engaging convex portion with the engaging structure, the engaging position of the engaging convex portion with respect to the engaging structure is switched between the first position and the second position. The flow path of the tube can be opened and closed. According to the present invention, the flow path of the tube can be opened and closed with a simple structure.

FIG. 1 is a perspective view of a clamp according to the first embodiment of the present invention in a natural state. FIG. 2A is a right side view of the clamp according to the first embodiment of the present invention in a natural state. FIG. 2B is a left side view of the clamp according to the first embodiment of the present invention in a natural state. FIG. 3 is a cross-sectional view of the clamp according to the first embodiment of the present invention in a natural state. FIG. 4 is an arrow cross-sectional view of the clamp according to the first embodiment of the present invention on the plane including the 4-4 line of FIG. 2A. FIG. 5 is a right side view of the clamp according to the first embodiment of the present invention immediately after the engaging convex portion is fitted into the groove. FIG. 6 is a right side view of the clamp according to the first embodiment of the present invention, in which the engaging protrusion is engaged with the groove at the first position. FIG. 7 is a right side view of the clamp according to the first embodiment of the present invention in which the engaging protrusion is engaged with the groove at the second position. FIG. 8A is a right side view of the clamp according to the first embodiment of the present invention, in which the clamp is attached to the tube and is in a natural state. FIG. 8B is a right side view of the clamp according to the first embodiment of the present invention, in which the clamp is mounted on the tube and the engaging protrusion is engaged with the groove at the first position. FIG. 8C is a right side view of the clamp according to the first embodiment of the present invention, in which the clamp is mounted on the tube and the engaging protrusion is engaged with the groove at the second position. FIG. 9 is a perspective view of the clamp according to the second embodiment of the present invention in a natural state. FIG. 10 is a side view of the clamp according to the second embodiment of the present invention in a natural state. FIG. 11 is a cross-sectional view of the clamp according to the second embodiment of the present invention in a natural state. FIG. 12 is a perspective view of the clamp according to the third embodiment of the present invention in a natural state. FIG. 13 is a cross-sectional view of the clamp according to the third embodiment of the present invention in a natural state, in a plane passing through an engaging convex portion and a guide groove. FIG. 14 is a perspective view of the clamp according to the fourth embodiment of the present invention in a natural state. FIG. 15 is a side view of the clamp according to the fourth embodiment of the present invention in a natural state. FIG. 16 is a cross-sectional view of the clamp according to the fourth embodiment of the present invention in a natural state. FIG. 17 is a perspective view of the clamp according to the fifth embodiment of the present invention in a natural state. FIG. 18 is a cross-sectional view of the clamp according to the fifth embodiment of the present invention in a natural state, in a plane passing through an engaging convex portion and a guide groove. FIG. 19 is a perspective view of the clamp according to the sixth embodiment of the present invention in a natural state. FIG. 20 is a cross-sectional view of the clamp according to the sixth embodiment of the present invention in a natural state on the surface passing through the engaging convex portion and the guide groove. FIG. 21 is a perspective view of the clamp according to the seventh embodiment of the present invention in a natural state. FIG. 22 is a cross-sectional view of the clamp according to the seventh embodiment of the present invention in a natural state, in a plane passing through an engaging convex portion and an inclined surface. FIG. 23 is a side view of the clamp according to the eighth embodiment of the present invention in a natural state. FIG. 24 is a side view of the clamp according to the ninth embodiment of the present invention in a natural state. FIG. 25 is a perspective view of the clamp according to the tenth embodiment of the present invention in a natural state. FIG. 26 is a side view of the clamp according to the tenth embodiment of the present invention in a natural state. FIG. 27 is a perspective view of the clamp according to the eleventh embodiment of the present invention in a natural state. FIG. 28 is a side view of the clamp according to the eleventh embodiment of the present invention in a natural state.

In the clamp of the present invention, the infusion tube can be inserted and removed between the first arm and the second arm in a state where the engaging protrusion is not engaged with the engaging structure. You may be able to do it. Such an embodiment facilitates attachment / detachment of the clamp to / from the infusion tube.

When the engaging convex portion is engaged with the engaging structure at the second position and the operating portion is displaced so that the engaging convex portion is separated from the second position, the first elastic portion is formed. The elastic restoring force of the first arm may separate the first arm from the second arm and move the engaging protrusion to the first position. According to this aspect, the flow path of the tube can be switched from the closed state to the open state by a simple operation of pushing the operation unit to displace it. This facilitates the realization of a configuration in which when the door of the infusion pump is closed, the door displaces the operating portion and the tube switches from the closed state to the open state. Therefore, the clamp is highly compatible with the infusion pump.

The engaging protrusion may be irreversibly engaged with the engaging structure. According to such an embodiment, after the clamp is attached to the tube and the engaging protrusion is engaged with the engaging structure, it becomes difficult to remove the clamp from the tube. For example, the user can easily recognize that the tube with the clamp (eg, an infusion set) is a dedicated product of the infusion pump to which the clamp fits.

In the clamp of the present invention, the engaging convex portion can be engaged with the engaging structure unless the engaging convex portion is displaced in a direction perpendicular to the surface on which the first arm swings. It may be configured so that it cannot be done. According to such an embodiment, a clamp in which the engaging protrusions irreversibly engage with the engaging structure can be realized with a simple structure.

A guide structure for guiding the engaging protrusion to the engaging structure may be provided on the second arm. Such an embodiment is advantageous in facilitating the work of engaging the engaging protrusions with the engaging structure.

The guide structure may include an inclined surface. When the engaging convex portion slides on the inclined surface toward the engaging structure, the inclined surface displaces the engaging convex portion in a direction perpendicular to the surface on which the first arm swings. You may. According to such an aspect, a guide structure that facilitates the work of engaging the engaging convex portion with the engaging structure can be easily realized with a simple configuration.

The guide structure may include a guide groove in which the engaging protrusion moves. In this aspect, it is relatively difficult to engage the engaging protrusion with the engaging structure without passing through the guide groove. For this reason, in a natural state in which the engaging convex portion is not engaged with the engaging structure, it is possible to prevent an unintentional situation in which the engaging convex portion is engaged with the engaging structure due to an external force or the like. can do.

The second arm may be provided with a pair of the guide structures on both side surfaces thereof. The pair of guide structures may be symmetrical. Such an embodiment is advantageous in facilitating the work of engaging the engaging protrusions with the engaging structure. It is also advantageous to reduce the possibility that the clamp will be damaged due to the clamp being twisted during the work.

Alternatively, the pair of guide structures may be asymmetric. Such an embodiment is advantageous in making it difficult to disengage the engaging protrusion from the engaging structure.

The engaging convex portion may be located closer to the first elastic portion than the distal end farthest from the first elastic portion of the operating portion. Such an embodiment is advantageous in making it difficult to disengage the engaging protrusion from the engaging structure.

The engaging convex portion may be provided on a plate material extending parallel to the surface on which the first arm swings. Since the plate material has high strength, it is relatively difficult to deform it. Therefore, the above aspect is advantageous in making it difficult to disengage the engaging protrusion from the engaging structure.

Alternatively, the engaging protrusion may be provided on an elongated rod-shaped bar. Since the bar has low strength, it is relatively easy to deform. Therefore, the above aspect is advantageous in facilitating the work of engaging the engaging protrusion with the engaging structure.

The operating portion may include a pair of the engaging convex portions. The pair of engaging protrusions may be separated from each other and face each other. Such an embodiment is advantageous in facilitating the work of engaging the engaging protrusions with the engaging structure. It is also advantageous to reduce the possibility that the clamp will be damaged due to the clamp being twisted during the work.

The position of the engaging convex portion in a natural state in which the engaging convex portion is not engaged with the engaging structure, the first position, and the second position are the swing centers of the first arm. It may be located on a common arc concentric with. In such an embodiment, even if the clamp is left for a long period of time with the engaging convex portion engaged with the engaging structure at the first position or the second position, the elastic force of the second elastic portion is maintained without deterioration. It is advantageous to.

In a state where the engaging convex portion is engaged with the engaging structure, the engaging position of the engaging convex portion with respect to the engaging structure is determined by the first arm and the second arm in the flow path of the infusion tube. It may be possible to further switch to the third position to be semi-closed. For example, if the third position is set according to the desired flow rate of the infusion solution, the flow rate of the infusion solution can be easily set to the desired flow rate simply by moving the engaging convex portion to the third position. ..

When the engaging convex portion is engaged with the engaging structure at the third position and the operating portion is displaced so that the engaging convex portion is separated from the third position, the first elastic portion is formed. The elastic restoring force of the first arm may separate the first arm from the second arm and move the engaging protrusion to the first position. According to this aspect, the flow path of the tube can be switched from the semi-closed state to the open state by a simple operation of pushing the operation unit to displace it.

The position of the engaging convex portion in a natural state in which the engaging convex portion is not engaged with the engaging structure and the third position are concentric arcs concentric with the swing center of the first arm. It may be located on top. Such an embodiment is advantageous in maintaining the elastic force of the second elastic portion without deteriorating even if the clamp is left for a long period of time with the engaging convex portion engaged with the engaging structure at the third position. ..

The engaging structure may include an engaging groove into which the engaging protrusion can be fitted and moved. According to such an aspect, an engaging structure in which the engaging protrusions are engaged can be realized with a simple configuration. Since the engaging protrusion and the engaging groove do not need to have a sharp tip, they are excellent in durability and reliability, and are easy to manufacture.

The engaging groove may have a wedge shape or a substantially "V" shape. Such an aspect is intended to be a situation in which the engaging convex portion moves from the second position to the first position due to an external force or the like in a state where the engaging convex portion is engaged with the engaging structure at the second position. It is advantageous to prevent it from occurring without.

Alternatively, the engaging groove may have a substantially "U" shape. According to such an aspect, it is possible to easily realize a configuration in which the position of the engaging convex portion can be switched between the first position and the second position with a small force. In addition, the durability of the second elastic portion with respect to repeated switching is improved.

The engaging structure may include at least one rib through which the engaging protrusions can engage and slide. According to such an aspect, an engaging structure in which the engaging protrusions are engaged can be realized with a simple configuration. Since the engaging protrusion and the rib do not need to have a sharp tip, they are excellent in durability and reliability, and are easy to manufacture.

Hereinafter, the present invention will be described in detail with reference to suitable embodiments. However, it goes without saying that the present invention is not limited to the following embodiments. For convenience of explanation, each figure referred to in the following description is a simplified representation of the main elements (or members) constituting the embodiment of the present invention. Therefore, within the scope of the present invention, any element not shown in the drawings may be added, or any element shown in the drawings may be changed or omitted. In the drawings cited in the description of each embodiment, the elements corresponding to the elements shown in the drawings cited in the preceding embodiments are designated by the same reference numerals as those assigned in the drawings of the preceding embodiments. is there. Overlapping description of such elements has been omitted, and the description of the preceding embodiments should be taken into account as appropriate.

(Embodiment 1)
FIG. 1 is a perspective view of a clamp 1a according to a first embodiment of the present invention in a natural state. 2A and 2B are a right side view and a left side view of the clamp 1a. FIG. 3 is a cross-sectional view of the clamp 1a along a surface including the central position in the thickness direction. The clamp 1a includes a first arm 10 and a second arm 20. Each of the first arm 10 and the second arm 20 extends substantially linearly. A first elastic portion in which one end (first end) in the longitudinal direction of the first arm 10 and one end (first end) in the longitudinal direction of the second arm 20 are curved in an arc shape (or substantially "C" shape). It is connected via 51. In the natural state where no external force is applied to the clamp 1a, the first arm 10 and the second arm increase the distance between the first arm 10 and the second arm 20 as the distance from the first elastic portion 51 increases. The 20 is connected to the 20 in a substantially wedge shape (substantially "V" shape) via a first elastic portion 51. The first elastic portion 51 is elastically bendable and deformable so that the first arm 10 can swing (or rotate) relative to the second arm 20. The swing center (not shown) of the first arm 10 is located at or near the first elastic portion 51. In the present invention, the surface on which the first arm 10 swings with respect to the second arm 20 is referred to as a “swinging surface”. The cross section of FIG. 3 is parallel to the rocking surface. The direction perpendicular to the rocking surface is called the "thickness direction". The "swing" is the relative movement of the other of the first arm 10 and the second arm 20, and is "swing of the first arm 10 with respect to the second arm 20" and "first. It can be expressed as any of "swing of the second arm 20 with respect to the arm 10", but in the present invention, it will be expressed by the former. Further, the side close to the swing center (or the first elastic portion 51) of the first arm 10 is referred to as a "proximal side", and the side far from the swing center is referred to as a "distal side". The "distal end" and "proximal end" of a member (or element) refer to the farthest and closest parts of the member from the swing center, respectively.

The first arm 10 includes a first blocking portion 11 projecting toward the second arm 20. The second arm 20 includes a second blocking portion 21 projecting toward the first arm 10. The first and second closing portions 11 and 21 are rib-shaped protrusions extending along the longitudinal direction of the first and second arms 10 and 20, respectively. In the natural state, the first closed portion 11 and the second closed portion 21 are separated from each other and are inclined with respect to each other. When forces F11 and F21 (see FIG. 2A) in directions in which the first arm 10 and the second arm 20 approach each other are applied to the first arm 10 and the second arm 20, the first elastic portion 51 is bent and deformed, respectively. The first closed portion 11 and the second closed portion 21 can be brought close to each other.

The first arm 10 is provided with regulating protrusions 12 and 13 protruding toward the second arm 20 from the first closing portion 11 at both ends in the longitudinal direction of the first closing portion 11. Similarly, the second arm 20 is provided with regulating projections 22 and 23 protruding toward the first arm 10 from the second closing portion 21 at both ends in the longitudinal direction of the second closing portion 21. The regulating protrusions 12, 13, 22, and 23 are for regulating the position of the tube with respect to the clamp 1a so that the tube is located between the first closing portion 11 and the second closing portion 21 (described later). 8A and 8B). In the present invention, some or all of the regulating protrusions 12, 13, 22, and 23 may be omitted.

An operation unit 30 is provided at an end (second end) of the first arm 10 opposite to the first elastic portion 51 via a second elastic portion 52 curved in an arc shape (or substantially "C" shape). ing. The operation unit 30 is composed of two plate members 31 parallel to the rocking surface. The two plate members 31 are separated from each other in the thickness direction and face each other. The two plate members 31 are connected via the second elastic portion 52 and the connecting portion 32. The connecting portion 32 is provided at the distal end of the operating portion 30 (that is, the portion of the operating portion 30 farthest from the first elastic portion 51). A substantially cylindrical engaging convex portion 33 projects from the inner surface of the two plate members 31 facing each other toward the opposing plate members 31. The pair of engaging protrusions 33 are separated from each other in the thickness direction and face each other. The two plate members 31 including the engaging convex portion 33 are symmetrical. The engaging convex portion 33 is located at or near the edge of the plate member 31 near the second arm 20 (particularly, the engaging portion 40). The engaging convex portion 33 is far from both the second elastic portion 52 and the connecting portion 32. Therefore, by elastically bending and deforming the two plate members 31, it is possible to increase the distance between the pair of engaging convex portions 33.

The position and shape of the connecting portion 32 are not limited to this embodiment and can be arbitrarily changed as long as the distance between the pair of engaging convex portions 33 can be increased. For example, the connecting portion 32 may be continuous with the second elastic portion 52. Further, the connecting portion 32 can be omitted.

The second elastic portion 52 is elastically bendable and deformable so that the operating portion 30 can swing (displace) relative to the first arm 10. When a force F31 (see FIG. 2A) substantially parallel to the longitudinal direction of the first arm 10 is applied to the distal end (connecting portion 32 or its vicinity) of the operating portion 30, the second elastic portion 52 is bent and deformed, and the operating portion is deformed. The 30 and the engaging convex portion 33 can be moved toward the first elastic portion 51.

The second arm 20 includes an engaging portion 40 at an end (second end) opposite to the first elastic portion 51. The engaging portion 40 is a plate-like body substantially parallel to the rocking surface. A groove (engagement groove) 45 is provided in the engaging portion 40. The groove 45 is a through hole (opening) that penetrates the engaging portion 40 in the thickness direction. The groove 45 includes a linear first groove portion 45a and a linear second groove portion 45b. The first groove portion 45a and the second groove portion 45b extend radially from the innermost 45i closest to the first elastic portion 51 of the groove 45. The groove 45 has a substantially wedge shape (or a substantially "V" shape) as a whole. The first groove portion 45a is inclined with respect to the longitudinal direction of the second arm 20 so as to approach the operation portion 30 as the distance from the innermost 45i increases. The second groove portion 45b is substantially parallel to the longitudinal direction of the second arm 20, and is in a straight line extending radially (or in the radial direction) from the swing center where the first arm 10 swings with respect to the second arm 20. It is almost in line. The first groove portion 45a is arranged closer to the operation portion 30 than the second groove portion 45b. The circles P1 and P2 shown by the alternate long and short dash lines in FIGS. 2A and 2B indicate the first position and the second position in which the engaging convex portion 33 is stably locked in the groove 45 (details will be described later). ..

Guide grooves (guide structures) 43 are provided on both side surfaces of the engaging portion 40 substantially along a straight line connecting the first groove portion 45a of the groove 45 and the position of the engaging convex portion 33 in the natural state. FIG. 4 is a cross-sectional view taken along the line of the clamp 1a on the surface including the 4-4 line of FIG. 2A passing through the guide groove 43 and the engaging convex portion 33. The two guide grooves 43 have a symmetrical shape. The bottom surface of the guide groove 43 has a first flat surface 43a, an inclined surface 43c, and a second flat surface 43b adjacent to each other in this order from the outer peripheral edge of the engaging portion 40 toward the groove 45. The first flat surface 43a and the second flat surface 43b are substantially parallel to the rocking surface. The inclined surface 43c is inclined so that the thickness of the engaging portion 40 in the guide groove 43 becomes thicker toward the groove 45. The distance between the pair of engaging convex portions 33 is the same as or slightly larger than the thickness of the engaging portion 40 on the first flat surface 43a, and smaller than the thickness of the engaging portion 40 on the second flat surface 43b.

The clamp 1a is made of a hard material such as a resin material. For example, it is preferable that the clamp 1a is integrally manufactured as a single component by injection molding a resin material. The resin material that can be used is not limited, and examples thereof include polyethylene, polypropylene, polycarbonate, styrene ethylene, polyethylene terephthalate, polybutylene terephthalate, and butylene styrene block copolymer. Considering that the first and second elastic portions 51 and 52 and the plate material 31 are elastically bent and deformed, polyolefin resins such as polyethylene and polypropylene are preferable.

1 to 4 show a natural state (or initial state) of the clamp 1a in which no external force is applied to the clamp 1a and none of the parts of the clamp 1a is elastically deformed. In the natural state, the operating portion 30 and the engaging portion 40 are separated from each other, and the first closed portion 11 and the second closed portion 21 are separated from each other. The clamp 1a can be attached to and detached from the tube by passing the tube through the opening 53 between the operating portion 30 and the engaging portion 40 (see FIG. 8A described later).

The clamp 1a in the natural state can be deformed to engage the engaging protrusion 33 with the groove 45. That is, a force F11 and a force F21 (see FIG. 2A) are applied to the first arm 10 and the second arm 20, and the first elastic portion 51 is bent and deformed to bring the first arm 10 and the second arm 20 closer to each other. In parallel with this, a force F31 (see FIG. 2A) is applied to the operating portion 30, the second elastic portion 52 is bent and deformed, and the operating portion 30 and the engaging convex portion 33 are slightly moved toward the first elastic portion 51. Move to. The engaging convex portion 33 is fitted into the guide groove 43 (particularly the portion corresponding to the first flat surface 43a thereof) provided in the engaging portion 40. When the first arm 10 (or the operating portion 30) is strongly pushed toward the second arm 20 (or the engaging portion 40), the pair of engaging convex portions 33 slide on the inclined surface 43c and are spaced apart from each other. It is enlarged, further slides on the second flat surface 43b, and then fitted into the groove 45 (first groove portion 45a). If necessary, some tool may be used to deform the plate member 31 so that the distance between the pair of engaging protrusions 33 is increased. FIG. 5 is a right side view of the clamp 1a immediately after the engaging convex portion 33 is fitted into the groove 45.

After that, the forces F11, F21, and F31 are released. FIG. 6 is a right side view of the clamp 1a in this state. The clamp 1a of FIG. 6 is slightly deformed from the state of FIG. More specifically, the elastic recovery force of the first elastic portion 51 causes the first arm 10 and the second arm 20 to be slightly separated from each other as compared with FIG. Further, the operating portion 30 is slightly moved away from the first elastic portion 51 as compared with FIG. The engaging convex portion 33 is located at or near the end of the first groove portion 45a (the position farthest from the first elastic portion 51, the distal end of the first groove portion 45a). The position of the engaging convex portion 33 shown in FIG. 6 is referred to as "first position P1". While the first elastic portion 51 urges the first arm 10 away from the second arm 20 (that is, so as to return to the natural state shown in FIG. 2A), the engaging convex portion 33 is formed in the groove 45. It is stably engaged at the first position P1. When the engaging convex portion 33 is at the first position P1, the second elastic portion 52 is substantially elastically restored to the natural state shown in FIG. 2A. The tip of the first block 11 of the first arm 10 and the tip of the second block 21 of the second arm 20 are separated from each other and are inclined with respect to the other party.

The sides of the groove 45 (ie, the surface defining the width of the groove 45) 45s (see FIGS. 1 and 4) are parallel to the thickness direction. Therefore, once the engaging convex portion 33 is fitted into the groove 45 and engaged, it is difficult to allow the engaging convex portion 33 to escape from the groove 45 thereafter. That is, the engaging convex portion 33 irreversibly engages with the groove 45.

In the state of FIG. 6, forces F12 and F22 can be applied to the first arm 10 and the second arm 20 in a direction in which they are closer to each other. If necessary, a force F32 toward the first elastic portion 51 may be applied to the operating portion 30. The first arm 10 approaches the second arm 20, and in parallel with this, the engaging convex portion 33 moves in the first groove portion 45a from the first position P1 toward the innermost 45i. Along with this, the first elastic portion 51 is further elastically bent and deformed, and the second elastic portion 52 is also elastically bent and deformed. When the force F32 is released after the engaging convex portion 33 reaches the innermost 45i, the engaging portion 40 moves away from the first elastic portion 51 due to the elastic recovery force of the second elastic portion 52. The engaging convex portion 33 moves in the second groove portion 45b in a direction away from the innermost 45i.

After that, the above forces F12 and F22 are released. FIG. 7 is a right side view of the clamp 1a in this state. The engaging convex portion 33 is located at or near the end of the second groove portion 45b (the position farthest from the first elastic portion 51, the distal end of the second groove portion 45b). The position of the engaging convex portion 33 shown in FIG. 7 is referred to as "second position P2". While the first elastic portion 51 urges the first arm 10 away from the second arm 20 (that is, so as to return to the natural state shown in FIG. 2A), the engaging convex portion 33 is formed in the groove 45. It is stably engaged at the second position P2. When the engaging convex portion 33 is at the second position P2, the second elastic portion 52 is substantially elastically restored to the natural state shown in FIG. 2A. The tip of the first block 11 of the first arm 10 and the tip of the second block 21 of the second arm 20 are close to each other and substantially parallel to each other.

In the state of FIG. 7, a force F33 toward the first elastic portion 51 can be applied to the operation portion 30. The engaging convex portion 33 moves in the second groove portion 45b from the second position P2 toward the innermost 45i. Along with this, the second elastic portion 52 is elastically bent and deformed. When the engaging convex portion 33 escapes from the second groove portion 45b (or reaches the innermost 45i), the force F33 is released. The elastic recovery force of the first elastic portion 51 causes the first arm 10 to swing away from the second arm 20. In parallel with this, the engaging convex portion 33 moves in the first groove portion 45a from the innermost 45i toward the first position P1. The clamp 1a returns to the state of FIG. 6 in which the engaging convex portion 33 is engaged with the groove 45 at the first position P1.

After that, in the same manner as described above, the engaging convex portion 33 is engaged with the groove 45 at the first position P1 (FIG. 6), and the engaging convex portion 33 is engaged with the groove 45 at the second position P2. The state of the clamp 1a can be switched as many times as necessary with (FIG. 7).

The clamp 1a is attached to a flexible infusion tube (hereinafter, simply referred to as "tube") that connects a container for storing infusion (infusion bag) and a needle punctured in a patient's vein, and opens and closes the flow path of the tube. Used for An example of how to use the clamp 1a will be described below.

FIG. 8A shows the clamp 1a in its natural state (see FIGS. 1 to 4) attached to the tube 90. In FIG. 8A, the tube 90 is shown in cross-sectional view in a plane parallel to the swing plane of the clamp 1a. The tube 90 is located between the first obstruction portion 11 and the second obstruction portion 21. The clamp 1a can be attached to the tube 90 by passing the tube 90 through the opening 53 of the clamp 1a. When the tube 90 is passed through the opening 53, the tube 90 is compressed and deformed in the radial direction as necessary, or the first elastic portion 51 is deformed to form a distance between the operating portion 30 and the engaging portion 40. (That is, the opening 53) may be enlarged. Since the distance between the regulating protrusion 12 and the regulating protrusion 22 in the natural state is smaller than the outer diameter of the tube 90, once the clamp 1a is attached to the tube 90, the clamp 1a is a tube even if vibration or an external force is applied. It does not unintentionally deviate from 90. Further, since the distance between the regulating protrusion 13 and the regulating protrusion 23 in the natural state is smaller than the outer diameter of the tube 90, the tube 90 is a first elastic portion from between the first closing portion 11 and the second closing portion 21. It does not move into 51.

Next, as shown in FIG. 8B, the engaging convex portion 33 is engaged with the groove 45 at the first position P1 (see FIG. 6). In this state, the tube 90 is substantially undeformed and its flow path is open.

Next, as shown in FIG. 8C, the engaging convex portion 33 is moved to the second position P2 (see FIG. 7). The tube 90 is compressed in the radial direction by the first closing portion 11 and the second closing portion 21, and the flow path of the tube 90 is closed.

A state in which the clamp 1 is attached to the tube 90 by switching the position of the engaging convex portion 33 between the first position P1 (see FIG. 8B) and the second position P2 (see FIG. 8C) as described above. Can open and close the flow path of the tube 90.

For example, the tube 90 and the clamp 1a can be delivered to a medical institution such as a hospital as an "infusion set" in which the clamp 1a is attached to the tube 90. The engaging protrusion 33 is at the first position P1 (see FIG. 8B). The medical institution moves the engaging protrusion 33 to the second position P2 (see FIG. 8C) when preparing the infusion. Alternatively, the infusion set may be delivered to the medical institution with the engaging protrusion 33 at the second position P2 (see FIG. 8C). With the engaging protrusion 33 at the second position P2, the upstream end of the tube 90 is connected to the infusion bag that stores the infusion solution, and the needle provided at the downstream end of the tube 90 is punctured into the patient's vein. The infusion can be started by switching the engaging convex portion 33 of the clamp 1a from the second position P2 (see FIG. 8C) to the first position P1 (see FIG. 8B). After that, when the engaging convex portion 33 is switched from the first position (see FIG. 8B) to the second position (see FIG. 8C), the infusion solution can be stopped.

The clamp 1a may be attached to an infusion pump and used in the same manner as the clamp of Patent Document 2. In this case, the position of the engaging convex portion 33 may be switched between the first position P1 and the second position P2 in conjunction with the opening and closing of the door of the infusion pump. For example, an infusion set is prepared in which the engaging protrusion 33 is at the second position P2 (see FIG. 8C) and the flow path of the tube 90 is blocked. The door of the infusion pump is opened, and the clamp 1a and the tube 90 are attached to the pump body of the infusion pump. When the door is closed, the door pushes the operating portion 30 (force F33 in FIG. 7), the engaging convex portion 33 moves to the first position P1 (see FIG. 8B), and the tube 90 switches to the open state. Drive the infusion pump to infuse. When the infusion is completed and the door is opened, a force (forces F12 and F22 in FIG. 6) is applied to the clamp 1a in conjunction with this, the first arm 10 moves toward the second arm 20, and the engagement is convex. The portion 33 moves to the second position P2 (see FIG. 8C), and the tube 90 switches to the closed state. Removing the tube 90 and clamp 1a from the infusion pump does not cause free flow of infusion to the patient due to gravity.

As described above, in the clamp 1a of the first embodiment, the operating portion 30 on the first arm 10 side is provided with the engaging convex portion 33, and the engaging portion 40 on the second arm 20 side is provided with the groove 45. There is. With the engaging convex portion 33 engaged with the groove 45, the positions of the engaging convex portion 33 are set to the first position P1 (see FIG. 8B) for opening the tube 90 and the tube 90 for being closed. Switch between the second position P2 (see FIG. 8C). The engaging convex portion 33 is engaged with the groove 45 in both the open state and the closed state of the tube 90. The tube 90 can be opened and closed simply by moving the engaging convex portion 33 between the first position P1 and the second position P2 in the groove 45. The tube 90 can be opened and closed with a simple structure of an engaging convex portion 33 and a groove 45 in which the engaging convex portion 33 can move.

In the conventional clamp of Patent Document 2 described above, the first and second engaging portions have sharp tips. Therefore, when the first and second engaging portions are repeatedly engaged with and disengaged from the first and second groove portions, the tip is worn or chipped, and the open state and the closed state can be stably maintained. It will be difficult. Further, since it is necessary to form such a sharp tip with a predetermined accuracy, it is difficult to manufacture the clamp.

On the other hand, in the first embodiment, the engaging convex portion 33 only needs to be able to move between the first position (see FIG. 8B) and the second position (see FIG. 8C) without escaping from the groove 45. .. Since the engaging convex portion 33 and the groove 45 do not have sharp tips like the first and second engaging portions of the conventional clamp, chipping and wear are unlikely to occur. Even if the position of the engaging convex portion 33 is repeatedly switched between the first position P1 and the second position P2, the tube 90 can be stably opened and closed. Therefore, the clamp 1a is excellent in durability and reliability. Further, even if the accuracy of the engaging convex portion 33 and the groove 45 is relatively loose, the engaging convex portion 33 can be stably engaged with the first position P1 and the second position P2, so that the tube 90 can be opened and closed. It is possible to perform an operation. Therefore, the clamp 1a is easy to manufacture.

In a state where the engaging convex portion 33 is engaged with the groove 45 at the second position P2 (see FIGS. 7 and 8C), the operating portion 30 is first placed so that the engaging convex portion 33 is separated from the second position P2. It can be displaced toward the elastic portion 51. Immediately after the engaging convex portion 33 escapes from the second groove portion 45b, the elastic restoring force of the first elastic portion 51 separates the first arm 10 from the second arm 20 and causes the engaging convex portion 33 to move to the first position P1 ( (See FIGS. 6 and 8B). The tube 90 can be switched from the closed state to the open state by a simple operation of pushing the operation unit 30 (see the force F33 in FIG. 7) to displace it in this way. This makes it possible to easily realize a configuration in which when the door of the infusion pump is closed, the door pushes the operation unit 30 and the tube 90 is switched from the closed state to the open state. Therefore, the clamp 1a is highly compatible with the infusion pump.

Regardless of whether the engaging protrusion 33 is in the first position (see FIG. 8B) or the second position (see FIG. 8C), the operating portion 30 projects distally to the engaging portion 40. Therefore, it is easy to apply the forces F32 and F33 to the operation unit 30. In this respect as well, the clamp 1a is highly compatible with the infusion pump.

The amount of movement of the force F33 and the engaging convex portion 33 (or the operating portion 30) required to release the engaging convex portion 33 from the second position P2 is the distance (or the second) from the second position P2 to the innermost 45i. It can be arbitrarily adjusted by changing the length of the two groove portions 45b). The second groove portion 45b has a predetermined length rather than a shallow recess (for example, a semicircular recess) that can simply lock the engaging convex portion 33, and the second position P2 is such a second groove portion. Since it is provided at or near the end of 45b, even if the clamp 1a (particularly its operating portion 30) collides with a surrounding object, the engaging convex portion 33 moves from the second position to the first position. It is unlikely that an unintended situation will occur in which the flow path of the tube 90 switches from the closed state to the open state. The distance from the second position P2 to the innermost 45i (or the length of the second groove 45b) is arbitrary, but is 1 times or more, more 1.5 times or more, particularly the outer diameter of the engaging convex portion 33. It is preferably twice or more.

The engaging convex portion 30 irreversibly engages with the groove 45. That is, after the engaging convex portion 33 is engaged with the groove 45, it is difficult to release the engagement. For example, when the infusion set in which the clamp 1a is attached to the tube 90 and the engaging protrusion 30 is engaged with the groove 45 (FIG. 8B or 8C) is delivered to the medical institution, the medical institution attaches the clamp 1a to the tube. It is virtually impossible to remove from 90. The irreversible attachment of the clamp 1a to the tube 90 is advantageous for the user to recognize that the infusion set should not be used for infusion pumps other than the infusion pump to which the clamp 1a is compatible. ..

The engaging convex portion 33 is arranged away from the distal end of the operating portion 30 on the first elastic portion 51 side (that is, the first arm 10 side). This makes it difficult for the user to access the pair of engaging protrusions 33. Further, the connecting portion 32 connects the two plate members 31 at or near the distal end of the operating portion 30. This makes it difficult for the user to increase the distance between the two plate members 31. As a result, it is difficult for the user to displace the pair of engaging protrusions 33 so as to be separated from each other. This is advantageous in making it difficult to disengage the engaging protrusion 33 from the groove 45.

A guide groove 43 for guiding the engaging convex portion 33 to the groove 45 is provided in the second arm 20 (particularly, the engaging portion 40). It is difficult to engage the engaging convex portion 33 with the groove 45 unless the engaging convex portion 33 is passed through the guide groove 43. Therefore, in a natural state in which the engaging convex portion 33 is not engaged with the groove 45 (see FIGS. 1 to 4), the engaging convex portion 33 unintentionally engages with the groove 45 due to an external force or the like. The possibility can be reduced.

When the force F31 (see FIG. 2A) is applied to the operating portion 30 in the clamp 1a in the natural state to slightly move the engaging convex portion 33 toward the first elastic portion 51, the engaging convex portion 33 is moved to the guide groove 43. Cannot be fitted. This is also advantageous in reducing the possibility that the engaging convex portion 33 unintentionally engages with the groove 45 due to an external force or the like in a natural state (see FIGS. 1 to 4). Of course, the clamp of the present invention is configured so that the engaging convex portion 33 fits into the guide groove 43 by simply swinging the first arm 10 toward the second arm 20 without applying a force F31. You may be.

The bottom surface of the guide groove 43 is provided with an inclined surface 43c that is inclined so as to displace the engaging convex portion 33 in the thickness direction as it approaches the groove 45. This is advantageous for facilitating the work of engaging the engaging protrusion 33 with the groove 45. In the first embodiment, the first and second flat surfaces 43a and 43b are provided adjacent to the inclined surface 43c, but one or both of these may be omitted.

The operating portion 30 is provided with a pair of engaging convex portions 33, and the engaging portion 40 is provided with a pair of guide grooves 43. The pair of engaging protrusions 33 and the pair of guide grooves 43 are both symmetrical. Therefore, in the process of engaging the engaging convex portion 33 with the groove 45, the first arm 10 may simply swing toward the second arm 20 along the swing surface. Unlike the third embodiment described later, it is not necessary to apply a force to the clamp 1a to displace the first arm 10 and the second arm 20 in opposite directions in the thickness direction. This is advantageous for facilitating the work of engaging the engaging convex portion 33 with the groove 45, and reduces the possibility that the clamp 1a is damaged due to the clamp 1a being twisted during the work. It is advantageous to do.

The arc 55 of the alternate long and short dash line in FIG. 2A is concentric with the swing center at which the first arm 10 swings with respect to the second arm 20 due to the deformation of the first elastic portion 51. The position of the engaging convex portion 33 when the clamp 1a is in the natural state, the first position P1 of the engaging convex portion 33, and the second position P2 of the engaging convex portion 33 are all located on the common arc 55. To do. Therefore, when the engaging convex portion 33 is in the first position P1 (see FIGS. 6 and 8B) and the second position P2 (see FIGS. 7 and 8C), the second elastic portion 52 is substantially not deformed. .. This is because even if the clamp 1a is left for a long period of time with the engaging convex portion 33 engaged with the groove 45 at the first position P1 or the second position P2, the elastic force of the second elastic portion 52 is not deteriorated. It is advantageous to maintain. For example, the elastic force of the second elastic portion 52 can be reduced as compared with the first elastic portion 51, so that the second elastic portion 52 can be miniaturized or thinned to reduce the size of the entire clamp 1a. it can.

In the above example, the groove 45 is a through hole penetrating the engaging portion 40, but the present invention is not limited thereto. For example, non-penetrating grooves may be provided symmetrically on both side surfaces of the engaging portion 40.

(Embodiment 2)
FIG. 9 is a perspective view of the clamp 1b according to the second embodiment of the present invention in a natural state. 10 and 11 are side views and cross-sectional views of the clamp 1b in a natural state.

The operation unit 30b of the second embodiment includes two plate members 31b that are separated from each other in the thickness direction and face each other. The wedge-shaped end edge of each plate member 31b on the side of the second arm 20 (particularly the engaging portion 40 thereof) is curved toward the opposite plate member 31b to form the engaging convex portion 33b. In the first embodiment, the plate material 31 and the engaging convex portion 33 can be clearly distinguished, but in the present embodiment 3, the boundary between the plate material 31b and the engaging convex portion 33b is ambiguous, and the shape from the plate material 31b to the engaging convex portion 33b. Is changing continuously. Although not shown, the clamp 1b of the second embodiment is similar to the first embodiment by switching the engaging position of the engaging convex portion 33b with respect to the groove 45 between the first position and the second position. The flow path can be opened and closed.

In the clamp 1a of the first embodiment, stress tends to be concentrated on the boundary between the plate member 31 and the engaging convex portion 33, and the possibility of breakage such as cracks at the boundary cannot be completely denied. In the clamp 1b of the second embodiment, since the shape is continuously changed from the plate member 31b to the engaging convex portion 33b, there is no place where stress is concentrated. Therefore, the clamp 1b is more durable.

A connecting portion similar to the connecting portion 32 of the first embodiment may be provided at a position away from the engaging convex portion 33b to connect the two plate members 31b.

The second embodiment is the same as the first embodiment except for the above. The description of the first embodiment also applies to the second embodiment.

(Embodiment 3)
FIG. 12 is a perspective view of the clamp 1c according to the third embodiment of the present invention in a natural state. In the operation portion 30c of the third embodiment, the engaging convex portion 33c is provided only on one of the two plate members 131a and 131b facing each other. FIG. 13 is a cross-sectional view of the clamp 1c on the surface passing through the engaging convex portion 33c and the guide groove 43. The cross section of FIG. 13 corresponds to the cross section of FIG.

The engaging convex portion 33c of the third embodiment protrudes longer from the plate member 131a than the engaging convex portion 33 of the first embodiment. In order to engage the engaging convex portion 33c with the groove 45, it is necessary to displace the first arm 10 and the second arm 20 in opposite directions along the thickness direction. Therefore, the work of engaging the engaging convex portion 33c with the groove 45 is more difficult than that of the first embodiment. It is also more difficult than the first embodiment to disengage the engaging convex portion 33c after engaging it with the groove 45.

Although not shown, the clamp 1c of the third embodiment has the tube 90 by switching the engaging position of the engaging convex portion 33c with respect to the groove 45 between the first position and the second position, as in the first embodiment. The flow path can be opened and closed.

The protruding length of the engaging protrusion 33c can be arbitrarily changed. The shorter the protruding length of the engaging convex portion 33c, the easier the work of engaging the engaging convex portion 33c with the groove 45.

Of the guide grooves 43 provided on both side surfaces of the engaging portion 40, the guide groove 43 on the side where the engaging convex portion 33c is not provided may be omitted. In this case, the deeper the guide groove 43 on the side where the engaging convex portion 33c is provided, the easier the work of engaging the engaging convex portion 33c with the groove 45.

The plate member 131b on which the engaging convex portion 33c is not provided is provided with the notch 131c by cutting out the portion facing the engaging convex portion 33c. This is due to the shape of the mold for forming the engaging convex portion 33c. If the engaging convex portion 33c can be formed, the notch 131c may be omitted.

Of the two plate materials 131a and 131b, the plate material 131b not provided with the engaging convex portion 33c may be omitted.

Similar to the second embodiment, the edge of the plate member 131a on the second arm 20 (particularly the engaging portion 40 thereof) side may be curved toward the opposing plate member 131b to form the engaging convex portion 33c. ..

The third embodiment is the same as the first embodiment except for the above. The description of the first embodiment also applies to the third embodiment.

(Embodiment 4)
FIG. 14 is a perspective view of the clamp 1d according to the fourth embodiment of the present invention in a natural state. 15 and 16 are side views and cross-sectional views of the clamp 1d in its natural state.

The first arm 10 is provided with an operating portion 30d via a second elastic portion 52. The operation unit 30d is a thin plate 35 which is an elongated plate material having a constant width extending from the second elastic portion 52, a pair of bars 36 extending from the thin plate 35, and a pair of engagements provided at the tips of the pair of bars 36. A joint convex portion 33 is provided. The pair of bars 36 are separated from each other in the thickness direction and face each other. The pair of bars 36 including the engaging protrusions 33 are symmetrical.

The bar 35 is made of an elongated rod-shaped member. The bar 35 has a relatively low strength and is easily deformed as compared with the plate member 31 of the first embodiment. Therefore, the engaging convex portion 33 can get over the inclined surface 43c and the second flat surface 43b of the guide groove 43 relatively easily. Therefore, the work of engaging the engaging convex portion 33 with the groove 45 is easy.

The thin plate 35 extends from the second elastic portion 52 toward the distal side, and the pair of bars 36 extend so as to fold back from the distal end of the thin plate 35 toward the proximal side. Therefore, it is difficult for the user to displace the pair of engaging protrusions 33 so as to be separated from each other. This is advantageous in making it difficult to disengage the engaging protrusion 33 from the groove 45.

The thin plate 35 extends to or near the distal end of the operating portion 30d (that is, the portion of the operating portion 30b that is farthest from the first elastic portion 51). This applies a force for moving the engaging convex portion 33 from the second position to the first position (force F33 in FIG. 7) not to the pair of bars 36 but to the relatively high-strength thin plate 35. This makes it possible to improve the reliability of the operation of switching the flow path of the tube 90 from the closed state to the open state.

In the fourth embodiment, the length ratio between the thin plate 35 and the bar 36 between the second elastic portion 52 and the engaging convex portion 33 can be arbitrarily changed. The longer the bar 36 is relative to the thin plate 35, the easier the displacement of the engaging convex portion 33 becomes. The thin plate 35 may be omitted, and a pair of bars 36 may extend from the second elastic portion 52.

Similar to the second embodiment, the tip of the bar 36 may be curved toward the opposite bar 36 to form the engaging convex portion 33.

Similar to the third embodiment, the engaging protrusion 33 may be provided on only one of the pair of bars 36. In this case, the other bar 36 may be omitted. Further, among the guide grooves 43 provided on both side surfaces of the engaging portion 40, the guide groove 43 on the side where the engaging convex portion 33 is not provided may be omitted.

The fourth embodiment is the same as the first embodiment except for the above. The description of the first embodiment also applies to the fourth embodiment.

(Embodiment 5)
FIG. 17 is a perspective view of the clamp 1e according to the fifth embodiment of the present invention in a natural state. FIG. 18 is a cross-sectional view of the clamp 1e on the surface passing through the engaging convex portion 33 and the guide grooves 43 and 143. The cross section of FIG. 18 corresponds to the cross section of FIG.

As in the first embodiment, the guide grooves 43 and 143 are formed on both side surfaces of the engaging portion 40. However, unlike the first embodiment, the guide groove 43 and the guide groove 143 are asymmetrical. As shown in FIG. 18, the bottom surface of the guide groove 143 has a first flat surface 43a, an inclined surface 43c, and a second flat surface 143b in this order from the outer peripheral edge of the engaging portion 40 toward the groove 45. It has adjacent to each other. The first flat surface 43a and the inclined surface 43c of the guide groove 143 are substantially symmetrical with those of the guide groove 43. The second flat surface 143b is displaced toward the guide groove 43 with respect to the top of the inclined surface 43c (the most protruding portion in the thickness direction). Therefore, a stepped surface 143s is formed between the inclined surface 43c and the second flat surface 143b due to the step in the thickness direction.

In the fifth embodiment, since the guide grooves 43 and the guide grooves 143 provided on both side surfaces of the engaging portion 40 are asymmetrical, after the engaging convex portion 33 engages with the groove 45, the engagement is engaged. It is even more difficult to release. In order to allow the two engaging convex portions 33 to escape from the groove 45, the engaging convex portions 33 on the guide groove 43 side are first mounted on the second flat surface 43b (first step), and then the guide groove The engaging protrusion 33 on the 143 side must be mounted on the inclined surface 43c (second step). This embodiment 5 requires more steps than the first embodiment (see FIG. 4) in which the two engaging protrusions 33 may be mounted on the two second flat surfaces 43b at the same time.

With the engaging convex portion 33 engaged with the groove 45 (specially the first groove portion 45a thereof), the operating portion 30 (or the first arm 10) and the engaging portion 40 (or the second arm 20) are forcibly engaged with each other. When a force is applied to them to separate them, the engaging convex portion 33 on the guide groove 43 side of the pair of engaging convex portions 33 collides with the side surface 45s of the groove 45. When a larger force is applied, the operating portion 30 is tilted, and the engaging convex portion 33 on the guide groove 143 side collides with the stepped surface 143s. When the operating portion 30 is tilted, the pair of engaging convex portions 33 are separated from each other more widely in order to allow the pair of engaging convex portions 33 to escape from the groove 45, as compared with the case where the operating portion 30 is not tilted. There must be. From this point as well, it is difficult to disengage the engaging convex portion 33 and the groove 45 in the fifth embodiment as compared with the first embodiment.

If the difficulty of disengaging the engaging convex portion 33 and the groove 45 is sufficient as in the first embodiment, in the fifth embodiment, the maximum thickness of the engaging portion 40 in the guide grooves 43 and 143 is set. It can be made smaller. This facilitates the work of engaging the engaging protrusion 33 with the groove 45.

The fifth embodiment is the same as the first embodiment except for the above. The description of the first embodiment also applies to the fifth embodiment.

The asymmetrical guide grooves 43 and 143 of the fifth embodiment may be applied to the second to fourth embodiments.

(Embodiment 6)
FIG. 19 is a perspective view of the clamp 1f according to the sixth embodiment of the present invention in a natural state. FIG. 20 is a cross-sectional view of the clamp 1f on the surface passing through the engaging convex portion 33 and the guide groove 243. The cross section of FIG. 20 corresponds to the cross section of FIG.

In the sixth embodiment, the inclined surface 43c (see FIG. 4) provided in the first embodiment is not provided on the bottom surface of the guide groove 243. The bottom surface of the guide groove 243 is composed of a single flat surface 243a. The thickness of the engaging portion 40 on the flat surface 243a is substantially the same as the thickness of the engaging portion 40 on the second flat surface 43b of the first embodiment. In the sixth embodiment, since the inclined surface 43c is not provided, some tool is required to increase the distance between the pair of engaging convex portions 33 when engaging the engaging convex portions 33 with the groove 45. .. On the other hand, in a natural state in which the engaging convex portion 33 is not engaged with the groove 45 (see FIGS. 19 and 20), the engaging convex portion 33 unintentionally engages with the groove 45 due to an external force or the like. The possibility can be reduced. For example, when a large number of clamps 1f in a natural state are stored in a common box and transported, it is possible to prevent the engaging convex portion 33 from engaging with the groove 45 due to an external force due to vibration or the like. As described above, in the sixth embodiment, the handleability of the clamp 1f in the natural state is improved.

The guide groove 243 of the sixth embodiment does not have to have an inclined surface 43c (see FIG. 4), and it is not essential that the bottom surface thereof is composed of a single flat surface 243a. For example, in the guide groove 43 (see FIG. 4) of the first embodiment, the inclined surface 43c may be omitted, and the first flat surface 43a and the second flat surface 43b may be adjacent to each other in a stepped manner.

The maximum thickness of the engaging portion 40 in the guide groove 243 can be arbitrarily changed.

In the sixth embodiment, the guide groove 243 may be omitted. That is, each of both side surfaces of the engaging portion 40 may be composed of a single flat surface.

The sixth embodiment is the same as the first embodiment except for the above. The description of the first embodiment also applies to the sixth embodiment.

The guide groove 243 of the sixth embodiment, which does not have the inclined surface 43c, may be applied to the second to fifth embodiments.

(Embodiment 7)
FIG. 21 is a perspective view of a clamp 1 g according to a seventh embodiment of the present invention in a natural state. FIG. 22 is a cross-sectional view of the clamp 1g on the surface passing through the engaging convex portion 33 and the inclined surface (guide structure) 343. The cross section of FIG. 22 corresponds to the cross section of FIG.

In the seventh embodiment, an inclined surface 343 is provided along the edge of the engaging portion 40 on the operation portion 30 side. The inclined surfaces 343 are symmetrically provided on both side surfaces of the engaging portion 40. The guide groove 43 of the first embodiment is not provided in the seventh embodiment. The inclined surface 343 is inclined so that the thickness of the engaging portion 40 becomes thicker toward the groove 45. The thickness of the engaging portion 40 at the end of the inclined surface 343 on the operating portion 30 side is preferably the same as or slightly thinner than the distance between the pair of engaging convex portions 33.

In the clamp 1a of the first embodiment, in order to engage the engaging convex portion 33 with the groove 45, it is necessary to first fit the engaging convex portion 33 into the guide groove 43. That is, it is necessary to adjust the position of the engaging convex portion 33 along the longitudinal direction of the first arm 10 so as to match the guide groove 43. In the seventh embodiment, such adjustment is unnecessary. The first arm 10 may simply be brought closer to the second arm 20 and the engaging convex portion 33 may be brought into contact with the inclined surface 343. After that, as in the first embodiment, the first arm 10 (or the operating portion 30) is strongly pushed toward the second arm 20 (or the engaging portion 40). The gap between the pair of engaging convex portions 33 is expanded while sliding on the inclined surface 343, and then the pair of engaging convex portions 33 are fitted into the groove 45 (first groove portion 45a). In the seventh embodiment, the work of engaging the engaging convex portion 33 with the groove 45 is easy.

A flat surface similar to the first flat surface 43a of the first embodiment may be provided on the operation unit 30 side of the inclined surface 343.

The present embodiment 7 is the same as the first embodiment except for the above. The description of the first embodiment also applies to the seventh embodiment.

The inclined surface 343 of the present embodiment 7 may be applied to the second to sixth embodiments.

(Embodiment 8)
FIG. 23 is a side view of the clamp 1h according to the eighth embodiment of the present invention in a natural state. In the eighth embodiment, the groove 145 has a linear third groove portion 45c in addition to the first groove portion 45a and the second groove portion 45b. The first, second and third groove portions 45a, 45b and 45c extend substantially radially from the innermost 45i. The third groove portion 45c is arranged between the first groove portion 45a and the second groove portion 45b, and is inclined with respect to the longitudinal direction of the second arm 20 so as to approach the operation portion 30 as the distance from the innermost groove portion 45i increases. ing.

The circle P3 shown by the alternate long and short dash line indicates the third position where the engaging convex portion 33 is stably locked to the groove 145. The third position P3 is located at or near the end of the third groove 45c (the position farthest from the first elastic portion 51, the distal end of the third groove 45c). In the eighth embodiment, the engagement position of the engagement convex portion 33 with respect to the groove 145 can be switched between the first position P1, the second position P2, and the third position P3.

Although not shown, when the engaging convex portion 33 is engaged with the groove 145 at the third position P3, the tip of the first closing portion 11 of the first arm 10 and the second closing of the second arm 20 The tip of the portion 21 is slightly separated from each other. The tube 90 between the first arm 10 (particularly its first obstruction 11) and the second arm 20 (particularly its second obstruction 21) is slightly compressed in the radial direction and its flow path is semi-obstructed. To. In the present invention, "semi-blocked" does not mean that the cross-sectional area of the flow path of the tube 90 is exactly half of the open state (see FIG. 8B), and the open state (see FIG. 8B) and the closed state (see FIG. 8B). It means that it is between (see FIG. 8C). The ratio (opening rate) of the flow path cross-sectional area of the semi-closed tube 90 to the flow path cross-sectional area of the tube 90 in the open state depends on the inclination of the third groove portion 45c (or the position of the third position P3). Can be changed. For example, if the position of the third position P3 is set according to the desired flow rate of the infusion solution, the flow rate of the infusion solution can be easily set to the desired flow rate simply by moving the engaging convex portion 33 to the third position P3. be able to.

When the engaging convex portion 33 is engaged with the groove 145 at the third position P3, the first elastic portion 51 is oriented so as to separate the first arm 10 from the second arm 20 (that is, shown in FIG. 23). Encourage (to return to the natural state). In this state, the operating portion 30 can be displaced toward the first elastic portion 51 so that the engaging convex portion 33 is separated from the third position P3. Immediately after the engaging convex portion 33 escapes from the third groove portion 45c, the elastic recovery force of the first elastic portion 51 separates the first arm 10 from the second arm 20 and brings the engaging convex portion 33 to the first position P1. Move. The tube 90 can be switched from the semi-closed state to the open state by a simple operation of pushing the operation unit 30 to displace it in this way.

The third position P3 is located on the common arc 55 where the engaging convex portion 33, the first position P1, and the second position P2 are located when the clamp 1h is in the natural state. The arc 55 is concentric with the swing center at which the first arm 10 swings with respect to the second arm 20. Therefore, when the engaging convex portion 33 is at the third position P3, the second elastic portion 52 substantially elastically recovers to the natural state shown in FIG. 23 and does not substantially deform. This is advantageous for maintaining the elastic force of the second elastic portion 52 without deteriorating even if the clamp 1h is left for a long period of time with the engaging convex portion 33 engaged with the groove 145 at the third position P3. Is.

Since the third position P3 is provided at or near the end of the third groove portion 45c having a predetermined length, even if the clamp 1a (particularly its operating portion 30) collides with a surrounding object, the engagement convexity is provided. It is unlikely that an unintended situation will occur in which the portion 33 moves from the third position P3 to the first position P1 and the flow path of the tube 90 is switched from the semi-closed state to the open state. The distance from the third position P3 to the innermost 45i (or the length of the third groove 45c) is arbitrary, but is 1 times or more, more 1.5 times or more, particularly the outer diameter of the engaging convex portion 33. It is preferably twice or more.

A locking position (fourth position P4, fifth) in which the groove 145 is stably locked between the first groove portion 45a and the second groove portion 45b in addition to the third groove portion 45c. A groove portion (fourth groove portion, fifth groove portion, ...) With a position P5, ...) may be further provided.

The present embodiment 8 is the same as the first embodiment except for the above. The description of the first embodiment also applies to the eighth embodiment.

The groove 145 of the eighth embodiment may be applied to the second to seventh embodiments.

(Embodiment 9)
FIG. 24 is a side view of the clamp 1i according to the ninth embodiment of the present invention in a natural state. In the ninth embodiment, the engaging portion 40 is provided with a groove 245 having a substantially “U” shape. The groove 245 is a through hole (opening) that penetrates the engaging portion 40 in the thickness direction. The groove 245 includes a first groove portion 245a, a second groove portion 245b, and a connecting groove portion 245c connecting them. The first groove portion 245a and the second groove portion 245b substantially follow a straight line extending radially (or in the radial direction) from the swing center where the first arm 10 swings with respect to the second arm 20. The first groove portion 245a is arranged closer to the operation portion 30 than the second groove portion 245b. The connecting groove portion 245c substantially follows an arc concentric with the swing center of the first arm 10 or a tangent line thereof. The first groove portion 245a and the second groove portion 245b extend from both ends of the connecting groove portion 245c toward the side opposite to the first elastic portion 51.

Although not shown, the engaging convex portion 33 includes the first position P1 at or near the end of the first groove portion 245a (the position farthest from the first elastic portion 51, the distal end of the first groove portion 245a), and It is stably locked to the groove 245 at the end of the second groove 245b (the position farthest from the first elastic portion 51, the distal end of the second groove 245b) or the second position P2 in the vicinity thereof. Similar to the first embodiment, when the engaging protrusion 33 is in the first position P1, the tube 90 is substantially not deformed and its flow path is in an open state. When the engaging protrusion 33 is at the second position P2, the tube 90 is compressed in the radial direction by the first closing portion 11 and the second closing portion 21, and the flow path of the tube 90 is closed. The position of the engaging convex portion 33, the first position P1 and the second position P2 when the clamp 1i is in the natural state are located on a common arc 55 concentric with the swing center of the first arm 10. ..

In the ninth embodiment, it is easy to make the first and second groove portions 245a and 245b shorter than those of the first and second groove portions 45a and 45b of the first embodiment. When the first and second groove portions 245a and 245b are short, the moving distance of the engaging convex portion 33 required to escape the engaging convex portion 33 from the first and second groove portions 245a and 245b is shortened. Therefore, as compared with the first embodiment, the position of the engaging convex portion 33 can be switched between the first position P1 and the second position P2 only by applying a relatively small force to the clamp 1i. Further, since the amount of deformation of the second elastic portion 52 when the position of the engaging convex portion 33 is switched between the first position P1 and the second position P2 is relatively small, the first position P1 and the second position P2 The durability of the second elastic portion 52 with respect to repeated switching between the two is improved.

Depending on the inclination of the first groove portion 245a, in order to move the engaging convex portion 33 from the first position P1 to the second position P2, the engaging convex portion 33 is first moved from the first position P1 along the first groove portion 245a. It may be necessary to move it to the connecting groove portion 245c. In this case, it is necessary to apply a force substantially parallel to the first groove portion 245a (that is, substantially parallel to the longitudinal direction of the first arm 10) to the operation portion 30. Compared to the first embodiment, more steps are required to switch the tube 90 from the open state to the closed state. This is advantageous in preventing erroneous operation because it forces the user to perform a more careful operation when the user manually performs this switching.

A third groove may be provided between the first groove 245a and the second groove 245b so that the groove 245 has a substantially "E" shape as a whole. In this case, as in the eighth embodiment, the engaging convex portion 33 is locked at the end of the third groove portion (the position farthest from the connecting groove portion 245c, the distal end of the third groove portion) or the third position P3 in the vicinity thereof. The flow path of the tube 90 can be semi-closed.

The present embodiment 9 is the same as the first embodiment except for the above. The description of the first embodiment also applies to the ninth embodiment.

The groove 245 of the ninth embodiment may be applied to the second to seventh embodiments.

(Embodiment 10)
FIG. 25 is a perspective view of the clamp 1j according to the tenth embodiment of the present invention in a natural state. FIG. 26 is a side view of the clamp 1j. In the tenth embodiment, ribs (engagement ribs) 345 and 346 are formed in the engaging portion 40 instead of the groove 45 of the first embodiment. The ribs 345 and 346 are protrusions protruding from the engaging portion 40 in the thickness direction. The first rib 345 is inclined with respect to the longitudinal direction of the second arm 20 so as to approach the operating portion 30 as the distance from the first elastic portion 51 increases. The second rib 346 is substantially parallel to the longitudinal direction of the second arm 20, and is a straight line extending radially (or in the radial direction) from the swing center where the first arm 10 swings with respect to the second arm 20. It is almost in line. The first rib 345 is separated from the second rib 346 and is arranged on the operation unit 30 side. The distal ends of the ribs 345 and 346 (the portion farthest from the first elastic portion 51) are curved in an arc shape. The circles P1 and P2 along the arc-shaped curved portion serve as the first position and the second position in which the engaging convex portion 33 is stably locked. An inclined surface (guide structure) 443 is formed on the upper edge (on the operating portion 30 side) of the first rib 345 (particularly the arcuate curved portion thereof). When the engaging convex portion 33 is engaged with the first rib 345, the engaging convex portion 33 slides on the inclined surface 443. After the engaging convex portion 33 is engaged with the first rib 345, it is difficult to disengage the engagement. Although not shown, the ribs 345 and 346 are provided symmetrically on both side surfaces of the engaging portion 40.

In order to move the engaging convex portion 33 from the first position P1 to the second position P2, the first arm 10 is brought closer to the second arm 20 while applying a force toward the first elastic portion 51 to the operating portion 30. .. The engaging convex portion 33 moves toward the proximal end of the first rib 345 while sliding on the side surface of the first rib 345. When the engaging convex portion 33 reaches the proximal end of the first rib 345 or its vicinity, the force on the operating portion 30 is released, and the engaging convex portion 33 can be engaged with the second rib 346. After that, the engaging convex portion 33 moves to the second position P2.

In order to move the engaging convex portion 33 from the second position P2 to the first position P1, a force is applied to the operating portion 30 toward the first elastic portion 51. The engaging convex portion 33 moves toward the proximal end of the second rib 346 while sliding on the side surface of the second rib 346. When the engaging convex portion 33 exceeds the proximal end of the second rib 346, the elastic restoring force of the first elastic portion 51 separates the first arm 10 from the second arm 20, and the engaging convex portion 33 becomes the first. Engage with rib 345. When the force on the operating portion 30 is released, the engaging convex portion 33 moves to the first position P1.

The clamp 1j of the tenth embodiment includes ribs 345 and 346 instead of grooves as an engaging structure in which the engaging convex portion 33 is engaged. Also in this case, the flow path of the tube 90 can be opened and closed by switching the position of the engaging convex portion 33 between the first position P1 and the second position P2. The ribs 345 and 346 have a simple structure, are excellent in durability, and are easy to manufacture.

The inclined surface 443 of the first rib 345 may be omitted. In this case, the engaging convex portions 33 can be engaged with the first rib 345 by increasing the distance between the pair of engaging convex portions 33 using some kind of tool. Alternatively, the engaging convex portion 33 may be engaged with the first rib 345 by displacing the engaging convex portion 33 distal to the distal end of the first rib 345.

The present embodiment 10 is the same as the first embodiment except for the above. The description of the first embodiment also applies to the tenth embodiment.

The ribs protruding from the engaging portion 40 of the tenth embodiment may be applied to the second to ninth embodiments. In that case, the shape and number of ribs can be changed as appropriate.

(Embodiment 11)
FIG. 27 is a perspective view of the clamp 1k according to the eleventh embodiment of the present invention in a natural state. FIG. 28 is a side view of the clamp 1k in a natural state. The clamp 1k includes a mounting structure 60 for mounting the clamp 1k on an infusion pump (not shown). The mounting structure 60 includes a plate member 61 parallel to the rocking surface. The plate member 61 projects from the second arm 20 toward the side opposite to the first arm 10. The plate member 61 is provided with a fitting structure including ribs (convex) 62a and grooves (concave) 62b extending parallel to the longitudinal direction of the second arm 20 and protrusions 63. Although not shown, a similar fitting structure is provided on the back surface of the plate member 61. The pump body of the infusion pump is provided with a structure that fits with these fitting structures.

The clamp 1k is attached to the tube of the infusion set. The engaging convex portion 33 is moved to the second position P2, and the flow path of the tube is closed by the clamp 1k. The door of the infusion pump is opened, the first elastic portion 51 is directed toward the pump body, and the clamp 1k is inserted into the pump body along the longitudinal direction of the second arm 20. The fitting structure provided in the mounting structure 60 fits into the pump body. The clamp 1k is firmly fixed to the pump body by its mounting structure 60. Subsequently, when the door is closed, the inner surface of the door pushes the operation unit 30 (force F33 in FIG. 7). The first arm 10 swings, the engaging convex portion 33 moves to the first position P1, and the tube is switched to the open state. Drive the infusion pump to infuse. After that, when the door is opened, a force (forces F12 and F22 in FIG. 6) is applied to the clamp 1a in conjunction with the door. The first arm 10 swings, the engaging convex portion 33 moves to the second position P2, and the tube is switched to the closed state. With the clamp 1k blocking the tube, the tube and clamp 1k can be removed from the pump body.

As described above, the clamp 1k includes a mounting structure 60 for fixing the clamp 1k to the infusion pump. Clamp 1k has high compatibility with infusion pumps. Therefore, the position of the engaging convex portion 33 is accurately switched between the first position P1 and the second position P2 in conjunction with the opening and closing of the door of the infusion pump, and as a result, the tube is in the open state and the closed state. Changes between and. It ensures that the tube is not removed from the infusion pump when it is open. This is advantageous in preventing free flow.

A mounting structure 60 is provided on the second arm 20. Therefore, the second arm 20 is immovable with respect to the pump body regardless of the opening and closing of the door, whereas the first arm 10 swings in conjunction with the opening and closing of the door. The operation unit 30 also swings integrally with the first arm 10. In one embodiment, a protrusion is provided on the inner surface of the door. When the door is closed with the engaging protrusion 33 at the second position P2, the protrusion pushes the operating portion 30 of the clamp 1k. The first arm 10 swings, and the engaging convex portion 33 moves to the first position P1. The operating portion 30 is separated from the protrusion, and the second elastic portion 52 returns to the initial state. In this embodiment, even if the door is kept closed for a long time, the second elastic portion 52 is maintained in the initial state, so that the elastic force of the second elastic portion 52 does not deteriorate.

Of course, unlike the present embodiment, the mounting structure 60 can be provided on the first arm 10. In this case, the first arm 10 is immovable with respect to the pump body regardless of the opening and closing of the door, whereas the second arm 20 swings in conjunction with the opening and closing of the door.

The configuration of the mounting structure 60 is not limited to this embodiment. The plate member 61, the rib 62a, the groove 62b, and the protrusion 63 are merely examples, and the mounting structure 60 may have any configuration other than these. The mounting structure of the present invention includes any configuration for mounting the clamp on the infusion pump.

The clamp 1k may be used to manually open and close the flow path of the tube without attaching it to the infusion pump.

The present embodiment 11 is the same as the first embodiment except for the above. The description of the first embodiment also applies to the eleventh embodiment.

The mounting structure of the 11th embodiment may be applied to the 2nd to 10th embodiments.

The above embodiments 1 to 11 are merely examples. The present invention is not limited to the above embodiments 1 to 11, and can be appropriately modified.

In the above embodiments 1 to 11, the engaging protrusion on the first arm 10 side irreversibly engages with the engaging structure (groove or rib) on the second arm 20 side, but the present invention is limited thereto. Not done. That is, after engaging the engaging convex portion with the engaging structure, the engagement between the engaging convex portion and the engaging structure can be relatively easily disengaged without using any tool. May be good. For example, the second flat portion 43b may be replaced with an inclined surface that is inclined in the direction opposite to the inclined surface 43c.

The clamp of the present invention can be used by being attached to an infusion pump. In this case, as described in the eleventh embodiment, the engaging convex portion may move between the first position P1 and the second position P2 in conjunction with the opening and closing of the door of the infusion pump. The mechanism provided in the infusion pump for deforming the clamp in conjunction with the opening and closing of the door is arbitrary. The clamp can be designed to fit the mechanism. The clamp of the present invention is advantageous for realizing anti-free flow.

Further, the clamp of the present invention is not attached to the infusion pump and can be used to manually open and close the flow path of the tube 90. The flow path of the tube 90 can be opened and closed with a simple operation.

INDUSTRIAL APPLICABILITY The present invention can be used as a clamp for opening and closing the flow path of an infusion tube in the medical field.

1a to 1k Clamp 10 1st arm 20 2nd arm 30, 30b, 30c, 30d Operation part 31, 31b, 131a, 131b Plate material 33, 33b, 33c Engagement convex part 36 Bar 40 Engagement part 43, 143, 243 Guide Groove (guide structure)
43c, 343,443 Inclined surface (guide structure)
45,145,245 grooves (engagement groove, engagement structure)
345,346 ribs (engagement structure)
51 1st elastic part 52 2nd elastic part 55 Arc 90 Infusion tube P1 1st position P2 2nd position P3 3rd position

Claims (20)

A clamp that can open and close the flow path of the infusion tube while attached to the infusion tube.
The clamp
A first arm and a second arm for blocking the flow path of the infusion tube,
An elastically bendable and deformable first elastic portion that connects the first arm and the second arm so that the first arm can swing with respect to the second arm.
An operating portion provided at the end of the first arm opposite to the first elastic portion so as to be displaceable with respect to the first arm via an elastically deformable second elastic portion.
With the engaging convex portion provided on the operation portion,
The second arm is provided with an engaging structure provided at an end opposite to the first elastic portion, and the engaging convex portion can be engaged.
In a state where the engaging convex portion is engaged with the engaging structure, the engaging position of the engaging convex portion with respect to the engaging structure is determined by the first arm and the second arm in the flow path of the infusion tube. A clamp characterized in that it can be switched between a first position that does not block and a second position in which the first arm and the second arm block the flow path of the infusion tube. The clamp according to claim 1, wherein the infusion tube can be inserted and removed between the first arm and the second arm in a state where the engaging protrusion is not engaged with the engaging structure. .. When the engaging convex portion is engaged with the engaging structure at the second position and the operating portion is displaced so that the engaging convex portion is separated from the second position, the first elastic portion is formed. The clamp according to claim 1 or 2, wherein the elastic restoring force of the first arm separates the first arm from the second arm and moves the engaging convex portion to the first position. The clamp according to any one of claims 1 to 3, wherein the engaging protrusion is irreversibly engaged with the engaging structure. Claims 1 to 4 that the engaging convex portion cannot be engaged with the engaging structure unless the engaging convex portion is displaced in a direction perpendicular to the surface on which the first arm swings. The clamp according to any one of the above. The clamp according to any one of claims 1 to 5, wherein a guide structure for guiding the engaging convex portion to the engaging structure is provided on the second arm. The guide structure includes an inclined surface.
When the engaging convex portion slides on the inclined surface toward the engaging structure, the inclined surface displaces the engaging convex portion in a direction perpendicular to the surface on which the first arm swings. The clamp according to claim 6. The clamp according to claim 6 or 7, wherein the guide structure includes a guide groove in which the engaging protrusion moves. The second arm is provided with a pair of the guide structures on both side surfaces thereof.
The clamp according to any one of claims 6 to 8, wherein the pair of guide structures are symmetrical. The second arm is provided with a pair of the guide structures on both side surfaces thereof.
The clamp according to any one of claims 6 to 8, wherein the pair of guide structures is asymmetric. The clamp according to any one of claims 1 to 10, wherein the engaging convex portion is located closer to the first elastic portion than the distal end of the operating portion farthest from the first elastic portion. .. The clamp according to any one of claims 1 to 11, wherein the engaging convex portion is a plate material extending parallel to a surface on which the first arm swings, or an elongated rod-shaped bar. The operating portion includes a pair of the engaging protrusions.
The clamp according to any one of claims 1 to 12, wherein the pair of engaging protrusions are separated from each other and face each other. The position of the engaging convex portion in a natural state in which the engaging convex portion is not engaged with the engaging structure, the first position, and the second position are the swing centers of the first arm. The clamp according to any one of claims 1 to 13, which is located on a common arc concentric with the above. In a state where the engaging convex portion is engaged with the engaging structure, the engaging position of the engaging convex portion with respect to the engaging structure is determined by the first arm and the second arm in the flow path of the infusion tube. The clamp according to any one of claims 1 to 14, which can be further switched to a third position to be semi-closed. When the engaging convex portion is engaged with the engaging structure at the third position and the operating portion is displaced so that the engaging convex portion is separated from the third position, the first elastic portion is formed. 15. The clamp according to claim 15, wherein the elastic restoring force of the first arm separates the first arm from the second arm and moves the engaging convex portion to the first position. The position of the engaging convex portion in a natural state in which the engaging convex portion is not engaged with the engaging structure and the third position are concentric arcs concentric with the swing center of the first arm. The clamp according to claim 15 or 16, which is located above. The clamp according to any one of claims 1 to 17, wherein the engaging structure includes an engaging groove into which the engaging convex portion can be fitted and moved. The clamp according to claim 18, wherein the engaging groove has a wedge shape, a substantially "V" shape, or a substantially "U" shape. The clamp according to any one of claims 1 to 17, wherein the engaging structure includes at least one rib into which the engaging protrusion can engage and slide.

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