infusion pump

Abstract

An infusion pump according to the present invention supplies a drug and comprises a main body part and a main body attachment part which sandwich therebetween an infusion tube and are capable of delivering the drug which is in the infusion tube, wherein: the main body part comprises a first locking part; the main body attachment part comprises a second locking part that locks with the first locking part; the main body attachment part attaches to the main body part by the first locking part and second locking part being locked with each other; and the first locking part and the second locking part lock with each other by deformation or movement of the first locking part or the second locking part due to an elastic force, in coordination with an attachment operation in which the main body part and the main body attachment part move closer to each other with the infusion tube therebetween.

Description

[Technical Field]

[0001] The present invention relates to an infusion pump. [Background technology]

[0002] A PCA (Patient Controlled Analgesia) pump has a drive unit that delivers the fluid and a reservoir unit that stores the drug. When a PCA pump is used to administer medical anesthesia to a patient, legal regulations require that the pump be designed to prevent the patient or their family from removing the drug (see Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2011 / 068648A2 Summary of the Invention [Problem to be solved by the invention]

[0004] To achieve such a structure, the pump described in Patent Document 1 is provided with a locking mechanism that secures the drug storage unit when it is attached to the drive unit and releases it when it is removed from the drive unit. However, the locking mechanism is cumbersome because it requires many operations. Furthermore, there is room for improvement in the operability of the locking mechanism, not only for PCA pumps but also for other pumps.

[0005] In view of the above, an object of the present invention is to provide an infusion pump equipped with a locking mechanism that can achieve a locked state with fewer operations than locking mechanisms according to the prior art. [Means for solving the problem]

[0006] The infusion pump according to the present invention is capable of delivering a drug, and includes a main body and a main body attachment part that sandwich an infusion tube between them to deliver the drug in the infusion tube. The main body includes a first locking part, and the main body attachment part includes a second locking part that locks with the first locking part. The main body attachment part is attached to the main body by the first locking part and the second locking part locking with each other. The first locking part and the second locking part are engaged with each other as the main body and the main body attachment part approach each other sandwiching the infusion tube, and the first locking part and the second locking part are deformed or moved by elastic force to lock with each other.

[0007] According to a preferred embodiment of the present invention, the first locking portion or the second locking portion is deformed or moved by an elastic force in a direction intersecting with the direction of movement of the main body portion and the main body mounting portion during the mounting operation.

[0008] According to a preferred embodiment of the present invention, one of the first and second locking portions includes a claw portion that engages with the other locking portion, an endless portion to which the claw portion is attached, a shaft that passes through the endless portion, and an elastic portion that can bias the endless portion in the longitudinal direction of the shaft. The one locking portion locks with the other locking portion as the claw portion and the endless portion move in the longitudinal direction of the shaft due to the elastic force of the elastic portion.

[0009] According to a preferred embodiment of the present invention, the endless portion has an elongated hole extending in a direction inclined with respect to the longitudinal direction, the shaft has a protrusion inserted into the elongated hole, and the endless portion moves in the longitudinal direction by rotating relative to the shaft.

[0010] According to a preferred embodiment of the present invention, the first and second locking portions are changeable from a locked state to a unlocked state by rotating the endless portion relative to the shaft and moving in the longitudinal direction. The main body portion includes a third locking portion that locks the second locking portion when the first and second locking portions change from the locked state to the unlocked state. The third locking portion allows the main body attachment portion to separate from the main body portion by moving or deforming in the longitudinal direction.

[0011] According to a preferred embodiment of the present invention, the first locking portion includes a housing having an opening extending in a direction perpendicular to the direction of movement of the main body attachment portion during the attachment operation. The second locking portion includes an insertion portion having a recess formed in a direction perpendicular to the direction of movement, and a moving portion that can change the amount of protrusion from the recess by moving within the recess. During the attachment operation, the moving portion changes the amount of protrusion from the recess and enters the opening of the housing, thereby locking the second locking portion with the first locking portion.

[0012] According to a preferred embodiment of the present invention, the first locking portion is movable in the movement direction of the moving portion and further includes a moving engagement portion engageable with the moving portion and a pushing portion pushes the moving engagement portion toward the moving portion. The first locking portion and the second locking portion are unlocked when the pushing portion pushes the moving engagement portion toward the moving portion and the moving portion moves out of the opening of the housing.

[0013] According to a preferred embodiment of the present invention, the main body includes a third locking portion that locks the second locking portion when the first locking portion and the second locking portion change from the locked state to the unlocked state. The third locking portion moves or deforms in the movement direction of the moving portion, thereby allowing the main body attachment portion to separate from the main body. [Effects of the Invention]

[0014] The infusion pump of the present invention realizes a locking mechanism that can achieve a locked state with fewer operations than locking mechanisms of conventional technology by engaging the first locking portion and the second locking portion with each other when the main body portion and the main body attachment portion are attached, by causing the first locking portion and the second locking portion to deform or move due to elastic force. [Brief explanation of the drawings]

[0015] [Figure 1] FIG. 1 is a front view of an infusion pump according to a first embodiment. [Figure 2] FIG. 2 is a bottom view of the infusion pump of FIG. 1. [Figure 3] 2 is a diagram illustrating the infusion pump of FIG. 1 in an unlocked state where the locking mechanism is disengaged. [Figure 4] FIG. 2 is a perspective view of the main body of FIG. 1. [Figure 5] FIG. 2 is a perspective view of the main body mounting portion of FIG. 1. [Figure 6] FIG. 2 is a diagram showing the internal structure of the infusion pump of FIG. [Figure 7] FIG. 2 is a diagram showing the internal structure of the infusion pump of FIG. [Figure 8] FIG. 2 is a diagram showing the internal structure of the infusion pump of FIG. [Figure 9] FIG. 2 is a diagram showing the internal structure of the infusion pump of FIG. [Figure 10] 2 is an enlarged view of a locking portion of the main body portion of FIG. 1. FIG. [Figure 11] 2 is an enlarged perspective view of a locking portion of the main body portion of FIG. 1. FIG. [Figure 12] 2 is an enlarged perspective view of a locking portion of the main body portion of FIG. 1. FIG. [Figure 13] FIG. 2 is a diagram illustrating a liquid delivery mechanism of the main body portion of FIG. [Figure 14] 3A and 3B are diagrams illustrating a buffer mechanism for an infusion tube according to the first embodiment. [Figure 15] 3A and 3B are diagrams illustrating a buffer mechanism for an infusion tube according to the first embodiment. [Figure 16] 10A and 10B are diagrams illustrating a locking mechanism according to a second embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0016] [First embodiment] 1 to 3 show an infusion pump 1 according to a first embodiment. Fig. 1 and Fig. 2 show a locked state in which the locking mechanism of the infusion pump 1 is engaged, and Fig. 3 shows an unlocked state in which the locking mechanism of the infusion pump 1 is disengaged.

[0017] The infusion pump 1 has a main body 100 and a drug filling unit 200. The main body 100 includes an operating unit 110 and a display unit 112. The operating unit 110 is used to operate the infusion pump 1. In this embodiment, the operating unit 110 is a button, but any other operating means may be used. The display unit 112 displays the status of the infusion pump 1. In this embodiment, the display unit 112 is a liquid crystal display (LCD), but any other display means may be used, and may have a function that allows input operations, such as a touch panel. The infusion pump 1 can be set, by a locking mechanism, to a state in which the drug filling unit 200 is attached to the main body 100 (hereinafter simply referred to as the "locked state") and a state in which the drug filling unit 200 can be separated from the main body 100 (hereinafter simply referred to as the "unlocked state"). The main body 100 is provided with a keyhole 118 into which a key 120 is inserted. By rotating the key 120 inserted into the keyhole 118 in a predetermined direction, the locking mechanism between the main body 100 and the medicine filling section 200 is released.

[0018] The drug filling unit 200 includes a main body attachment unit 210 attached to the main body unit 100, a drug storage unit 220 attached to the main body attachment unit 210, and an infusion tube 240 fixed to the main body attachment unit 210 and communicating with the drug storage unit 220. The main body attachment unit 210 is detachable from the main body unit 100. The main body attachment unit 210 includes a tube receiving surface 210a (see FIG. 5) that faces the main body unit 100 when attached to the main body unit 100. The infusion tube 240 is fixed onto the tube receiving surface 210a of the main body attachment unit 210. The drug storage unit 220 is used to store a drug. The infusion tube 240 is used as a flow path when sending a drug stored in the drug storage unit 220 to supply it to a patient.

[0019] 4 is a perspective view of the main body unit 100. The main body unit 100 is provided with an insertion hole 119 for attaching the main body attachment unit 210, finger units 130, finger unit holes 116 for exposing the finger units 130, a sensor hole 114 for detecting by a sensor, and a pivot unit 122 for enabling pivotal attachment to the main body attachment unit 210, on a main body-facing surface 100a that faces a tube receiving surface 210a (see FIG. 5) of the main body attachment unit 210. When the main body unit 100 and the main body attachment unit 210 are locked, the infusion tube 240 is sandwiched between the main body-facing surface 100a and the tube receiving surface 210a. The main body part 100 and the main body attachment part 210 can be attached by moving them closer to each other across the infusion tube 240 (hereinafter referred to as the "attachment operation") and engaging the first locking part 180 (see Figure 6, etc.) of the main body part 100, which will be described later, with the second locking part 230 (see Figure 6, etc.) of the main body attachment part 210, which will be described later.

[0020] The finger portion 130 controls the flow rate of the medication by pressing the infusion tube 240 sandwiched between the main body attachment portion 210 and the finger portion 130. The insertion hole 119 allows for the insertion of a second locking portion 230 (see FIG. 5) of the main body attachment portion 210, which will be described later, when the main body attachment portion 210 is attached to the main body portion 100. The sensor hole 114 allows for monitoring of the medication flow using a sensor, such as an occlusion sensor, and depending on the type of sensor, may be covered with a transparent plastic material or the like. Such plastic material or the like is installed appropriately. The pivoting portion 122 allows for pivoting of the main body attachment portion 210 to a gripping portion 250 (see FIG. 5), which will be described later.

[0021] FIG. 5 is a perspective view of the main body attachment unit 210. The main body attachment unit 210 includes, on a tube receiving surface 210a opposite the main body-facing surface 100a, a second locking portion 230 (described in detail below), a tube connector 245 that connects the infusion tube 240 and the drug storage unit 220 for communication, a tube guide portion 260 that is provided to sandwich the infusion tube 240, and a grip portion 250 that is provided at one end of the main body attachment unit 210 so as to be pivotally attached to the pivoting portion 122 of the main body unit 100. In this embodiment, the second locking portion 230 is a protrusion with an opening that penetrates in the extension direction of the infusion tube 240, but may have other shapes that can be engaged with the first locking portion 180 (see FIGS. 6 to 9) described below. Therefore, for example, the opening of the second locking portion 230 may be a recess that does not penetrate in the extension direction of the infusion tube 240.

[0022] The second locking portion 230 is inserted into the insertion hole 119 of the main body portion 100 when the main body attachment portion 210 is attached to the main body portion 100. The tube connector 245 and the infusion tube 240 form a flow path for supplying the drug stored in the drug storage portion 220 to the patient. The tube guide portion 260 clamps the infusion tube 240 on the tube receiving surface 210a, thereby restricting the meandering of the infusion tube 240. The gripping portion 250 is pivotally attached to the pivoting portion 122 of the main body portion 100. As a result of this pivoting, the drug filling portion 200 is pivotable relative to the main body portion 100.

[0023] 6 to 9 show the internal structure of the infusion pump 1. In addition to the insertion hole 119, finger portion 130, finger portion hole 116, sensor hole 114, and pivot portion 122 described above and shown in Fig. 4, the main body portion 100 includes a drive portion 160 that drives the finger portion 130, a drive portion cover 140 that covers the drive portion 160, finger guides 146 that are integrally formed with the drive portion cover 140 and control the direction of movement of the finger portion 130, an elastic portion 142 that urges the drive portion cover 140 in the direction toward the medicine filling portion 200, a first locking portion 180 that locks with the second locking portion 230, and a ball plunger 190a as a third locking portion 190 that prevents the main body attachment portion 210 from moving away from the main body portion 100 when the state changes from the locked state to the unlocked state.

[0024] The first locking portion 180 includes a claw portion 186 that engages with the second locking portion 230 when the main body mounting portion 210 is mounted to the main body 100, an endless portion 182 to which the claw portion 186 is attached, a shaft 181 that passes through the endless portion 182, an elastic portion 184 that can bias the endless portion 182 in the longitudinal direction of the shaft 181, a shaft holding portion 189 that is provided below the elastic portion 184 and surrounds the shaft 181, and a housing mounting portion 188 that fixes the shaft holding portion 189 to a housing 195 of the main body 100. In this embodiment, the endless portion 182 is cylindrical, but may have another endless shape. A keyhole 118 is provided in the housing mounting portion 188. The housing mounting portion 188 is attached to the housing 195 with a screw 187.

[0025] 6 to 9, the procedure for attaching the drug filling unit 200 to the main body 100 will be described. In the states shown in FIGS. 6 to 8, the drug filling unit 200 is not completely attached to the main body 100. In FIG. 6, the gripping portion 250 is pivotally attached to the pivoting portion 122, but the second locking portion 230 is not in contact with the claw portion 186, but is only in contact with the ball plunger 190a serving as the third locking portion 190. The ball plunger 190a shown in FIG. 6 has been pressed down and compressed by the second locking portion 230, and is not fitted into the opening of the second locking portion 230. FIG. 7 shows a state in which the attachment operation has progressed from the state shown in FIG. 6, moving the main body attachment unit 210 toward the main body 100 (the main body attachment unit 210 in FIG. 6 has been moved to the left). In FIG. 7, the second locking portion 230 is in contact with the claw portion 186. 7, ball plunger 190a is released from the downward pressure by second locking portion 230 and is fitted into the opening of second locking portion 230. FIG. 8 shows a state in which the attachment operation of moving main body attachment portion 210 toward main body portion 100 from the state shown in FIG. 7 has progressed further. In FIG. 8, second locking portion 230 slides against claw portion 186, thereby pushing claw portion 186 downward to one side in the longitudinal direction of shaft 181 (the downward side in FIGS. 6 to 9). Claw portion 186 can push shaft 181 downward to one side in the longitudinal direction by elastically deforming and compressing elastic portion 184. FIG. 9 shows a state in which the attachment operation of moving main body attachment portion 210 toward main body portion 100 from the state shown in FIG. 8 has progressed further. 9, the second locking portion 230 has climbed over the claw portion 186, and the first locking portion 180 and the second locking portion 230 are locked together. In other words, this shows a state in which the attachment of the main body portion 100 and the main body attachment portion 210 is complete. A portion of the claw portion 186 shown in FIG. 9 is fitted into the opening of the second locking portion 230. The claw portion 186 shown in FIG. 9 moves toward the other side of the longitudinal direction of the shaft 181 (upward in FIGS. 6 to 9) from the state shown in FIG. 8 due to the restoring force of the elastic portion 184, and fits into the opening of the second locking portion 230. In this way, the first locking portion 180 and the second locking portion 230 are locked together as the first locking portion 180 or the second locking portion 230 moves due to the elastic force in conjunction with the attachment operation in which the main body portion 100 and the main body attachment portion 210 approach each other with the infusion tube 240 sandwiched therebetween.In this embodiment, when the claw portion 186 is pushed down, the endless portion 182 to which the claw portion 186 is attached also moves downward, but for example, the claw portion itself, which is made of an elastic body, may be elastically deformed, thereby displacing in the longitudinal direction of the shaft 181. In other words, the first locking portion 180 or the second locking portion 230 may be deformed by an elastic force, thereby locking them together.

[0026] As described above, in FIG. 9, medicament-filling section 200 is attached to main body section 100. More specifically, when the opening provided in second locking section 230 comes to the upper side of claw section 186, which has been pressed down, endless section 182, which is integral with claw section 186 and is biased by elastic section 184, moves upward. As a result, the claw at the tip, which is part of claw section 186, enters the opening of second locking section 230. As a result, first locking section 180 and second locking section 230 are locked to each other. As a result, the attachment of medicament-filling section 200 to main body section 100 is completed. The position of claw section 186 in the longitudinal direction of shaft 181 shown in FIG. 9 is the same as the position shown in FIGS. 6 and 7. In this way, the first locking portion 180 of this embodiment is deformed or moved by an elastic force in a direction (the longitudinal direction of the shaft 181 in FIGS. 6 to 9 , as an example) intersecting the movement direction of the main body unit 100 and the main body attachment unit 210 during the attachment operation (the left-right direction in FIGS. 6 to 9 ). Furthermore, in this embodiment, the first locking portion 180 of the main body unit 100 is deformed or moved by an elastic force, and the locked state with the second locking portion 230 of the main body attachment unit 210 is changed, but this configuration is not limited to this. The second locking portion 230 of the main body attachment unit 210 may be configured to deform or move by an elastic force. In other words, the locked state with the first locking portion 180 of the main body unit 100 may be changed by the deformation or movement of the second locking portion 230 of the main body attachment unit 210 due to an elastic force.

[0027] In this embodiment, the endless portion 182 is provided with an elongated hole 185 that is inclined with respect to the longitudinal direction of the shaft 181. The shaft 181 is provided with a protrusion 183 that is inserted into the elongated hole 185 of the endless portion 182 and is movable along the extending direction of the elongated hole 185. Therefore, the endless portion 182 rotates relative to the shaft 181, and the endless portion 182 moves in the longitudinal direction of the shaft 181. The movement of the claw portion 186 in this embodiment is restricted by a restricting wall portion 196 in a plane perpendicular to the longitudinal direction of the shaft 181. FIG. 10 is an enlarged view of the first locking portion 180 of the main body 100, as viewed from the tip end side of the claw portion 186. Although FIGS. 6 to 9 only show the restricting wall portion 196 located on the rear side of the claw portion 186, as shown in FIG. 10, the restricting wall portions 196 are arranged on both sides of the claw portion 186. As a result, in this embodiment, by inserting the second locking portion 230 into the insertion hole 119 (see Figure 4), the medicine filling portion 200 can be attached to the main body portion 100 without any further operation by the user.

[0028] 11 and 12 are enlarged perspective views of the first locking portion 180 of the main body 100. In FIG. 11, the protrusion 183 is located at one end of the elongated hole 185 (the upper side in FIGS. 11 and 12, the tip side of the shaft 181), while in FIG. 12, the protrusion 183 is located at the other end of the elongated hole 185 (the lower side in FIGS. 11 and 12, the base end side of the shaft 181). By rotating the key 120 relative to the housing 195 of the main body 100, the shaft 181 also rotates in the same direction as the key 120. The endless portion 182 does not rotate together with the shaft 181 due to the above-mentioned restricting wall 196. Therefore, the protrusion 183 attached to the shaft 181 slides against the inner surface of the elongated hole 185, which is inclined relative to the shaft 181, thereby pressing the endless portion 182 in the longitudinal direction of the shaft 181 and allowing the endless portion 182 to move in the longitudinal direction of the shaft 181. When the endless portion 182 moves in the longitudinal direction of the shaft 181, the claw 186 attached to the endless portion 182 also moves in the longitudinal direction of the shaft 181. By utilizing this mechanism, the first locking portion 180 and the second locking portion 230 can be locked and unlocked. In other words, when the endless portion 182 moves downward in the longitudinal direction of the shaft 181, the first locking portion 180 and the second locking portion 230 can be unlocked.

[0029] As described in the preceding paragraphs, when first locking portion 180 and second locking portion 230 are locked together, rotating key 120 in a predetermined direction (counterclockwise relative to housing 195 of main body 100 in this embodiment) causes first locking portion 180 to move downward. In addition, drive unit cover 140 is biased by elastic portion 142 in a direction toward medicament filling portion 200, pushing back medicament filling portion 200 in the opposite direction to the direction of movement when attached. As a result, when first locking portion 180 moves downward and can be released from locking with second locking portion 230, first locking portion 180 moves away from second locking portion 230 against the restoring force of elastic portion 184, and the lock between first locking portion 180 and second locking portion 230 is released. After the first locking portion 180 and the second locking portion 230 are released from each other, the drug-filling portion 200 pivots about the pivoting portion 122 so as to move away from the main body portion 100 .

[0030] Referring again to Figure 8, even after the first locking portion 180 and the second locking portion 230 are disengaged, the ball plunger 190a serving as the third locking portion 190 still remains within the opening of the second locking portion 230. Therefore, even if the first locking portion 180 and the second locking portion 230 are disengaged and attempt to separate, the second locking portion 230 is locked by the ball plunger 190a serving as the third locking portion 190 (see Figure 7). As a result, the medicament filling portion 200 does not completely separate from the main body portion 100. In this way, a semi-latched mechanism between the main body portion 100 and the medicament filling portion 200 is realized. The ball plunger 190a serving as the third locking portion 190 can move or deform in the longitudinal direction of the shaft 181, and thus the locking state between the second locking portion 230 and the third locking portion 190 is released by the third locking portion 190 moving or deforming in the longitudinal direction of the shaft 181. As a result, the drug loading portion 200 including the main body attachment portion 210 can be separated from the main body portion 100. The semi-latch mechanism can be easily released by, for example, gripping the main body portion 100 and the drug loading portion 200 and applying a force in a direction to separate them, thereby moving or deforming the third locking portion 190. By having such a mechanism, the infusion pump 1 having the main body portion 100 and the drug loading portion 200 can automatically perform a series of operations, from releasing the locking between the first locking portion 180 and the second locking portion 230 to holding the main body portion 100 and the drug loading portion 200 by the semi-latch mechanism, simply by rotating the key 120. In this embodiment, the pivotal attachment portion 122 of the main body 100 is pivotally attached to the gripping portion 250 of the drug filling portion 200, and the main body 100 and the drug solution filling portion 200 are stably held even when held by the semi-latch mechanism, further preventing unexpected separation or dropping. After rotating the key 120, the infusion pump 1 can easily separate the main body 100 and the drug filling portion 200 by gripping them and applying force to them while rotating the gripping portion 250 relative to the pivotal attachment portion 122.

[0031] As described above, first locking portion 180 can change its shape from a locked state to a unlockable state by rotating endless portion 182 relative to shaft 181 and moving in the longitudinal direction of shaft 181. Main body 100 includes third locking portion 190 that fits into the opening of second locking portion 230 to lock second locking portion 230 when first locking portion 180 and second locking portion 230 change from a locked state to a unlockable state. Third locking portion 190 moves or deforms in the longitudinal direction of shaft 181, thereby allowing main body attachment portion 210 to move away from main body 100.

[0032] 13 shows the liquid delivery mechanism of the main body 100. The main body 100 further includes a chassis 150 that covers the drive unit cover 140 and is fixed to the housing 195. The elastic portion 142 biases the drive unit cover 140 so that it abuts against the chassis 150. Therefore, the drive unit 160, which is fixed to the drive unit cover 140, is also biased toward the chassis 150 by the elastic portion 142. The chassis 150 has an opening that allows the finger portion 130 to come into contact with the infusion tube 240. In this embodiment, the housing 195 and the chassis 150 are configured as separate bodies, but they may also be configured as an integrated body.

[0033] 14 and 15 schematically illustrate the buffer mechanism for the infusion tube of the main body 100. The finger portions 130 are driven by a mechanically connected drive unit 160 and controlled by a control unit. When the infusion tube 240 is sandwiched between the main body 100 and the main body attachment unit 210, the finger portions 130 are pressed by the infusion tube 240. As a result, as shown in FIG. 15, the finger portions 130 are pushed down. On the other hand, because the finger portions 130 are connected to the drive unit cover 140, the elastic portions 142 urge the finger portions 130 upward. Therefore, the elastic portions 142 maintain the state in which the finger portions 130 abut against the infusion tube 240. As a result, the finger portions 130 can be maintained in a state in which they can constantly press the infusion tube 240.

[0034] [Second embodiment] FIG. 16 shows an enlarged view of a locking mechanism according to a second embodiment of the present invention. An insertion hole 314 is formed in the main body 300, and the insertion hole 314 has a widened entrance. The main body 300 includes a first locking portion 380 and a third locking portion 390 attached to the first locking portion 380 or another portion of the main body 300 near the insertion hole 314. The main body attachment portion 410 of the drug-filling portion 420 includes a second locking portion 430. When the drug-filling portion is attached to the main body 300, the second locking portion 430 is inserted into the insertion hole 314, and the first locking portion 380 and the second locking portion 430 are locked to each other. In this embodiment, the third locking portion 390 is a ball plunger, but other locking means may be used.

[0035] Insertion hole 314 is formed above first locking portion 380. First locking portion 380 includes housing 381, a moving engagement portion 382 provided in housing 381, an elastic portion 383 that urges moving engagement portion 382 toward the inner surface of housing 381, and a push-out portion 384 that is provided next to moving engagement portion 382 and inserted between moving engagement portion 382 and the inner surface of housing 381 and that can press moving engagement portion 382 against the urging force of elastic portion 383. The second locking portion 430 comprises an insertion portion 431, a moving portion 432 provided in a recess extending in a direction (up and down in Figure 16) perpendicular to the movement direction of the main body attachment portion 410 during the attachment operation (in this embodiment, this is the same direction as the direction in which the insertion hole 314 extends within the insertion portion 431, and is the leftward direction in Figure 16), and an elastic portion 433 that connects the moving portion 432 and the insertion portion 431 and can urge the moving portion 432 in a direction to move out of the recess.

[0036] 16(a), the second locking portion 430 is inserted into the insertion hole 314. More specifically, when the insertion portion 431 of the second locking portion 430 approaches the entrance of the insertion hole 314 and comes into contact with the third locking portion 390, the moving portion 432 pushes down the third locking portion 390 with the elastic portion 433, thereby climbing over the third locking portion 390. The insertion portion 431 of the second locking portion 430 climbs over the third locking portion 390 and further enters the insertion hole 314, causing the third locking portion 390 to return to its original position. After climbing over the third locking portion 390, while the insertion portion 431 of the second locking portion 430 further enters the insertion hole 314, the moving portion 432 is urged downward by the elastic portion 433 and moves while sliding against the housing 381.

[0037] 16(b) shows a state in which the insertion portion 431 of the second locking portion 430 has been moved further into the insertion hole 314 from the state shown in FIG. 16(a). As shown in FIG. 16(b), when the moving portion 432 reaches a position directly above the opening 315 provided in the housing 381, the moving portion 432 enters the opening 315 because the moving portion 432 is biased downward by the elastic portion 433. As a result, the first locking portion 380 and the second locking portion 430 are locked to each other. As described above, the first locking portion 380 includes the housing 381 having the opening 315 extending in a direction perpendicular to the movement direction of the main body attachment portion during the attachment operation. The second locking portion 430 includes the insertion portion 431 having a recess provided in a direction (up and down in FIG. 16) perpendicular to the movement direction of the main body attachment portion 410 during the attachment operation (leftward in FIG. 16), and the moving portion 432 movable within the recess. During the mounting operation, the moving portion 432 changes the amount of protrusion from the recess, and the second locking portion 430 enters the opening 315 of the housing 381, thereby locking with the first locking portion 380.

[0038] 16(c), when the pushing portion 384 approaches the moving engagement portion 382, ​​the pushing portion 384 has a structure that tapers toward the moving engagement portion 382, ​​and therefore moves below the moving engagement portion 382. In other words, the pushing portion 384 is inserted between the moving engagement portion 382 and the inner surface of the housing 381. When the pushing portion 384 approaches the moving engagement portion 382 further, the pushing portion 384 has an inclined structure, and therefore the moving engagement portion 382 moves upward along the inclined surface of the pushing portion 384. As a result, the moving engagement portion 382 moves upward and pushes the moving portion 432 out of the opening 315. When the moving portion 432 is completely out of the opening 315, the second locking portion 430 becomes movable so as to move out of the insertion hole 314. As described above, first locking portion 380 is movable in the movement direction of moving portion 432, and includes moving engagement portion 382 that can engage with moving portion 432, and pushing portion 384 that can push moving engagement portion 382 toward moving portion 432. First locking portion 380 and second locking portion 430 are released from engagement when pushing portion 384 pushes moving engagement portion 382 toward moving portion 432 and moving portion 432 moves out of opening 315 of housing 381.

[0039] In FIG. 16(d), when the second locking portion 430 moves outward from the insertion hole 314 (toward the right in FIG. 16), the moving portion 432 is biased downward by the elastic portion 433 and therefore slides against the housing 381. Because the third locking portion 390 is provided to narrow the insertion hole 314, the moving portion 432 comes into contact with the third locking portion 390. As a result, the second locking portion 430 is locked near the entrance of the insertion hole 314 by the third locking portion 390. In this manner, a semi-latched mechanism is achieved between the main body portion 300 and the main body mounting portion 410 of the medicine filling portion 420. The third locking portion 390 can move or deform in the movement direction of the moving portion 432, and therefore, when the third locking portion 390 moves or deforms in the movement direction of the moving portion 432, the locked state between the second locking portion 430 and the third locking portion 390 is released. As a result, the medicament filling section 420 including the main body attachment section 410 can move away from the main body section 300. As described above, the main body section 300 is provided with the third locking section 390 that locks the second locking section 430 when the first locking section 380 and the second locking section 430 change from the locked state to the unlocked state. The third locking section 390 moves or deforms in the movement direction of the moving section 432 relative to the insertion section 431 (the up and down direction in FIG. 16 ), thereby allowing the medicament filling section 420 including the main body attachment section 410 to move away from the main body section 300.

[0040] In this application, "locking" means to lock by engaging with each other. In the embodiment described in this application, the locking of the first locking portion and the second locking portion means that the first locking portion and the second locking portion engage with each other, thereby locking the first locking portion and the second locking portion, and as a result, the drug-filled portion is attached to the main body portion. In the embodiment described in this application, the locking of the second locking portion and the third locking portion means that the second locking portion engages with the third locking portion, thereby locking the second locking portion, and as a result, the drug-filled portion remains in a predetermined position. Furthermore, in this application, "half-latched" means a state in which the device is not fully locked, but movement or displacement is restricted. [Explanation of symbols]

[0041] 1 infusion pump 100 Main body 100a Body facing surface 110 Operation section 112 Display section 113 Pipe Connector 114 Sensor hole 116 Finger hole 118 Keyhole 119 Insertion hole 120 keys 122 Pivot joint 130 Finger part 140 Drive unit cover 142 Elastic part 144 bar 146 Finger Guide 150 chassis 160 Drive unit 180 First locking part 181 Shaft 182 Cylindrical cam 183 pins 184 Elastic part 185 long hole 186 Claw 187 Screw 188 Housing mounting part 189 Shaft holder 190 Third locking part 190a Ball Plunger 195 cabinet 196 Restriction wall 200 Drug filling section 210 Main body attachment part 210a Pipe receiving surface 220 Storage Unit 230 Second locking part 240 Infusion tube 245 Pipe Connector 250 grip part 260 Pipe guide section 300 Main body 380 First locking part 381 Case 382 Moving engagement part 383 Elastic part 384 Extrusion section 390 Ball Plunger 430 Second locking part 431 Insertion part 432 Mobile Division 433 Elastic part

Claims

1. An infusion pump capable of delivering a drug, a main body portion and a main body attachment portion that sandwich an infusion tube between them and are capable of delivering a medicine in the infusion tube; the main body portion includes a first locking portion, the main body attachment portion includes a second locking portion that locks with the first locking portion, the main body attachment portion is attached to the main body portion by the first locking portion and the second locking portion being locked to each other, the first locking portion and the second locking portion are engaged with each other by deformation or movement of the first locking portion or the second locking portion due to elastic force in response to an attachment operation in which the main body portion and the main body attachment portion approach each other with the infusion tube sandwiched therebetween; one of the first and second locking portions includes a claw portion that engages with the other locking portion, an endless portion to which the claw portion is attached, a shaft that passes through the endless portion, and an elastic portion that can bias the endless portion in the longitudinal direction of the shaft, the claw portion and the endless portion of the one locking portion are moved in the longitudinal direction of the shaft by the elastic force of the elastic portion, thereby locking with the other locking portion; Infusion pump.

2. The endless portion has a long hole formed therein, the long hole extending in a direction inclined with respect to the longitudinal direction, the shaft includes a protrusion inserted into the slot; The infusion pump according to claim 1 , wherein the endless portion moves in the longitudinal direction by rotating relative to the shaft.

3. the first locking portion and the second locking portion are capable of changing their configurations from a locked state to a unlocked state by the endless portion rotating relative to the shaft and moving in the longitudinal direction, the main body portion includes a third locking portion that locks the second locking portion when the first locking portion and the second locking portion change from a locked state to a unlocked state, The infusion pump according to claim 2 , wherein the third engaging portion allows the main body attachment portion to be separated from the main body by moving or deforming in the longitudinal direction.

4. An infusion pump capable of delivering a drug, a main body portion and a main body attachment portion that sandwich an infusion tube between them and are capable of delivering a medicine in the infusion tube; the main body portion includes a first locking portion, the main body attachment portion includes a second locking portion that locks with the first locking portion, the main body attachment portion is attached to the main body portion by the first locking portion and the second locking portion being locked to each other, the first locking portion and the second locking portion are engaged with each other by deformation or movement of the first locking portion or the second locking portion due to elastic force in response to an attachment operation in which the main body portion and the main body attachment portion approach each other with the infusion tube sandwiched therebetween; the first engaging portion includes a housing having an opening extending in a direction perpendicular to the moving direction of the main body mounting portion during the mounting operation, the second engaging portion includes an insertion portion having a recess provided in a direction perpendicular to the moving direction, and a moving portion that can change the amount of protrusion from the recess by moving within the recess, An infusion pump in which the second engaging portion engages with the first engaging portion by the moving portion changing the amount of protrusion from the recess during the attachment operation and entering into the opening of the housing.

5. the first locking portion is movable in the movement direction of the moving portion and further includes a moving engagement portion that can engage with the moving portion and a pushing portion that can push the moving engagement portion toward the moving portion, 5. The infusion pump of claim 4, wherein the first locking portion and the second locking portion are unlocked when the pushing portion pushes the moving engagement portion toward the moving portion and the moving portion moves out of the opening in the housing.

6. 6. The infusion pump of claim 5, the main body portion includes a third locking portion that locks the second locking portion when the first locking portion and the second locking portion change from a locked state to a unlocked state, An infusion pump, wherein the third engaging portion allows the main body attachment portion to separate from the main body portion by moving or deforming in the movement direction of the moving portion.

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