JP7589016B2 - Syringe Pump - Google Patents

Description

This disclosure relates to a syringe pump.

There is known a medical pump that has an input device that accepts input operations by an operator, sets a set value based on the accepted input operation, and operates based on the set value. One example of such a medical pump is a syringe pump, in which a syringe containing a liquid such as a medicinal solution is placed, and the speed at which the plunger of the placed syringe is pushed out is controlled according to a set value set by the operator, thereby delivering the liquid into the living body of a patient or the like while controlling the flow rate.

Conventionally, syringe pumps have been known that include a body on which a syringe is placed and a lid that can be attached and detached to the body. For example, Patent Document 1 describes a syringe pump in which a cover can be attached and detached to a housing.

International Publication No. 2019/057467

The syringe pump described in Patent Document 1 is configured such that the cover is slid relative to the housing to insert the hinge pin into the pin receiver, thereby attaching the cover to the housing. The syringe pump described in Patent Document 1 also includes a movement prevention mechanism that prevents the cover attached to the housing by the blocking pin from moving. Therefore, the syringe pump described in Patent Document 1 needs to include a special mechanism called a movement prevention mechanism to prevent the cover from falling off the housing. Furthermore, the syringe pump described in Patent Document 1 includes a hinge mechanism consisting of a hinge pin and a pin receiver, and a movement prevention mechanism, so space is required for these mechanisms, and multiple parts are required to realize these mechanisms.

The objective of this disclosure is to provide a syringe pump that makes it easier to maintain the cover member attached to the main body.

A syringe pump according to a first aspect of the present invention comprises a body capable of housing a syringe and having a drive mechanism for driving the syringe, and a cover member switchable between a closed state in which the drive mechanism is covered and an open state in which the drive mechanism is not covered and attachable to the body by sandwiching the body at both ends, wherein one of the body or the cover member has a protruding portion that protrudes toward the other side of the body or the cover member in the closed state, and the other has a housing portion that houses the protruding portion in the closed state.

In a syringe pump according to one embodiment of the present invention, the protrusion is located outside the housing in the open state.

In a syringe pump according to one embodiment of the present invention, the main body further includes an operation unit for performing input operations related to drive control by the drive mechanism, and the cover member further covers the operation unit in the closed state.

In a syringe pump according to one embodiment of the present invention, the operation unit has a first operation unit that allows input operation in the closed state and a second operation unit that does not allow input operation.

In a syringe pump according to one embodiment of the present invention, the portion of the cover member that covers the first operating part is made of a soft material.

In a syringe pump according to one embodiment of the present invention, the main body has a joint protrusion protruding from a side surface, and the cover member has a through hole on the side surface into which the joint protrusion can be inserted, and when the joint protrusion is inserted into the through hole, the cover member can be rotated relative to the main body about an axis passing through the joint protrusion as a rotation axis, thereby switching between the open state and the closed state.

In a syringe pump according to one embodiment of the present invention, the protrusion is formed on an end of the main body or the cover member.

In a syringe pump according to one embodiment of the present invention, the protrusions are formed on both ends of the main body or the cover member.

The syringe pump according to one embodiment of the present invention further includes a locking mechanism for fixing the closed state.

In a syringe pump according to one embodiment of the present invention, the protrusion is formed on the cover member, and the storage portion is formed on the main body.

The syringe pump disclosed herein makes it easier to keep the cover member attached to the main body.

1 is a schematic diagram of a syringe pump as a medical pump according to one embodiment of the present invention. FIG. 2 is a perspective view of the syringe pump of FIG. 1 . FIG. 2 is a perspective view showing the syringe pump of FIG. 1 in a closed state. FIG. 2 is a partial enlarged view of the syringe pump in an open state. FIG. 2 is a partially enlarged view of the B-B cross section of the syringe pump in an open state. FIG. 2 is a partially enlarged view of the CC cross section of the syringe pump in a closed state.

One embodiment of the present invention will be described below with reference to the drawings. The same reference numerals are used to designate common components in each drawing.

Figure 1 is a schematic diagram of a syringe pump 1 as a medical pump according to one embodiment of the present invention. Figure 2 is a perspective view of the syringe pump 1 of Figure 1. Figures 1 and 2 show the syringe pump 1 without a syringe housed therein. The syringe pump 1 is used with a syringe housed therein by placing the syringe on the mounting portion 11 on which the syringe is placed. The syringe pump 1 is configured as a pump that delivers liquid housed inside a syringe housed in the syringe pump 1.

As shown in Figures 1 and 2, the syringe pump 1 includes a main body 2 and a cover member 3. The main body 2 accommodates a syringe. The main body 2 can drive the syringe accommodated in the syringe pump 1. The main body 2 functions as a pump that delivers the liquid contained inside the syringe by driving the syringe. The main body 2 includes a drive mechanism for driving the syringe, and an operation unit for performing input operations related to drive control by the drive mechanism.

The main body 2 includes a mounting portion 11, a slider 12, a clamp 14, a cylinder flange holder 15, a first input button group 31, a second input button group 32, a display portion 33, and a housing 46.

In this specification, the side of the syringe pump 1 on which the display unit 33 is arranged is referred to as the front side. Accordingly, FIG. 1 is a schematic diagram of the front side of the syringe pump 1. The syringe pump 1 is formed in a generally rectangular shape having long and short sides when viewed from the front. In the example shown in FIG. 1, the long side extends in the left-right direction, and the short side extends in the up-down direction. In this specification, when viewed from the front of the syringe pump 1, the long side direction is the x-axis direction, and the short side direction is the y-axis direction. In particular, when viewed from the front of the syringe pump 1, the right side is the x-axis positive direction, and the upper side is the y-axis positive direction. The direction perpendicular to the xy plane is the z-axis direction. In particular, the front side of the syringe pump 1 is the z-axis positive direction.

The syringe pump 1 can accommodate a syringe by placing the syringe on the mounting portion 11. The syringe placed on the mounting portion 11 includes, for example, a cylindrical cylinder that defines a hollow portion inside, and a pusher that is inserted into the hollow portion from the base end side of the cylinder and can move the hollow portion along the extension direction of the cylinder (the x-axis direction in the example shown in Figures 1 and 2) while closely adhering to the inner surface of the cylinder without any gaps in the circumferential direction. The cylinder has a cylinder flange at the base end, and defines an outlet hole at the tip that connects the hollow portion to the outside. A flexible tube can be connected to the tip of the cylinder. When the tube is connected to the tip of the cylinder, the outlet hole communicates with a flow path defined by the tube. A liquid such as a medicinal solution is contained in the hollow portion of the syringe.

A syringe can be placed on the mounting portion 11. When a syringe is placed on the mounting portion 11, the cylinder flange holder 15 stores a portion of the cylinder flange. This fixes the position of the cylinder relative to the main body 2.

The slider 12 functions as a drive mechanism for driving the syringe. That is, the drive mechanism of the main body 2 includes the slider 12. As shown in FIG. 1, the slider 12 has a pusher fixing portion 13. The slider 12 is movable so as to engage with the pusher of the syringe placed on the mounting portion 11. Specifically, the slider 12 is movable along the x-axis direction at a position on the positive x-axis side of the pusher of the syringe placed on the mounting portion 11. The slider 12 fixes the pusher of the syringe placed on the mounting portion 11 by the pusher fixing portion 13. The pusher moves integrally with the slider 12 as it moves along the x-axis direction while being fixed to the slider 12 by the pusher fixing portion 13. At this time, the cylinder housed in the mounting portion 11 is fixed in the x-axis direction to the syringe pump 1 by the cylinder flange holder 15. Therefore, when the slider 12 moves toward the tip of the syringe, the plunger moves toward the tip of the cylinder, and the liquid contained in the hollow portion is discharged from the outlet hole. In this way, the liquid contained in the hollow portion can be delivered to the inside of the living body through a flow path partitioned by a tube that can be connected to the tip of the cylinder.

The clamp 14 can rotate along the yz plane with the x-axis as the rotation axis, and can clamp the cylinder of the syringe placed on the mounting part 11 between the clamp 14 and the mounting part 11. By fixing the cylinder with the clamp 14, a part of the cylinder flange is less likely to come off the cylinder flange retainer 15, so the cylinder is firmly fixed to the main body 2. In addition, by providing a sensor that detects the rotation angle on the rotation axis of the clamp 14, the outer diameter of the fixed cylinder can be detected.

1 and 2, the first input button group 31 and the second input button group 32 are arranged on the surface of the housing 46 and are composed of various operation buttons that can accept input operations by the operator. The first input button group 31 and the second input button group 32 function as an operation unit for performing input operations related to drive control. That is, the operation unit is composed of the first input button group 31 as a first operation unit and the second input button group 32 as a second operation unit. The first input button group 31 includes, for example, a power button 31a for switching on and off the operating power of the syringe pump 1, and a start/stop button 31b for starting or stopping the liquid transfer. The second input button group 32 is a button group for setting various information related to the drive control by the drive mechanism (hereinafter referred to as "setting information"). The setting information is displayed, for example, on the display unit 33. The operator sets the setting information by performing input operations on the buttons of the second input button group 32 while looking at the setting information displayed on the display unit 33. The setting information may include, for example, information on the amount of liquid transferred by the syringe pump 1. In the example shown in Figures 1 and 2, the second input button group 32 has four buttons, but the number and arrangement of the buttons are not limited to those shown in Figures 1 and 2 and may have any appropriate number and arrangement. The first input button group 31 and the second input button group 32 output input information to a control unit that executes drive control by the drive mechanism of the main body 2.

The display unit 33 includes a display device such as a liquid crystal display or an organic electroluminescence display. The display unit 33 displays various information based on a signal from the control unit. For example, setting information is displayed on the display unit 33. The display unit 33 may display information on the actual amount of liquid delivered by the syringe pump 1. The actual amount of liquid delivered may include an actual measured value of the flow rate of the liquid delivered by the syringe pump 1 or an actual measured value of the dosage of the liquid being delivered. The display unit 33 may also display various types of alarm information. The main body 2 may include multiple display units, and each of these multiple display units may display different information.

The cover member 3 is a member capable of covering the surface of the main body 2. The cover member 3 is required to be configured to be capable of covering at least the drive mechanism of the main body 2. The cover member 3 may be configured to be capable of further covering the operation unit of the main body 2. In this embodiment, the cover member 3 is described below as being configured to be capable of covering the entire surface of the main body 2.

The cover member 3 is configured to be switchable between a closed state in which the drive mechanism is covered and an open state in which the drive mechanism is not covered. Figures 1 and 2 are diagrams showing the syringe pump 1 in an open state. In this embodiment, as shown in Figure 2, in the open state, the entire surface of the main body 2 is not covered by the cover member 3.

Figure 3 is a perspective view showing the closed state of the syringe pump 1 of Figure 1. When attached to the main body 2, the cover member 3 is configured to be rotatable on the yz plane around axis A extending in the x-axis direction as the axis of rotation, and can transition from the open state shown in Figure 2 to the closed state shown in Figure 3 by rotating around axis A. In this embodiment, as shown in Figure 3, in the closed state, the entire surface of the main body 2 is covered by the cover member 3.

The cover member 3 is configured to be detachable from the main body 2. The cover member 3 attached to the main body 2 may differ depending on the usage environment of the syringe pump 1. For example, a different cover member 3 may be attached to the main body 2 when the syringe pump 1 is used in a medical institution and when the syringe pump 1 is used outside the medical institution, such as in a patient's home.

For example, cover members 3 of different colors may be used when the syringe pump 1 is used inside a medical institution and when it is used outside a medical institution. Specifically, for example, the cover member 3 when used inside a medical institution (for use inside a medical institution) may be made of an uncolored transparent material, and the cover member 3 when used outside a medical institution (for use outside a medical institution) may be made of a colored transparent material. This allows the operator or patient to visually distinguish whether the cover member 3 attached to the main body 2 is for use inside or outside a medical institution, depending on whether the attached cover member 3 is colored.

In addition, for example, a cover member 3 having at least some different materials may be used when the syringe pump 1 is used inside a medical institution and when it is used outside a medical institution. For example, the cover member 3 for use inside a medical institution may be entirely made of a hard material, and the cover member 3 for use outside a medical institution may be made of a soft material only in the portion that covers the first input button group 31 in the closed state, and the other portions may be made of a hard material. When a cover member 3 for use inside a medical institution made entirely of a hard material is attached to the main body 2, the entire surface of the main body 2 is covered by the hard cover member 3 in the closed state. Therefore, even if an operator or a patient accidentally touches the syringe pump 1 in the closed state, the drive state by the drive mechanism and the setting information are not changed. On the other hand, when the cover member 3 for use outside the medical institution, in which only the portion covering the first input button group 31 is made of a soft material, is attached to the main body 2, in the closed state, the patient or the like cannot touch the drive mechanism or the second input button group 32, which is the second operation unit, and input operations to the second operation unit are also impossible. However, the first input button group 31, which is the first operation unit, can be operated by pressing it from above the soft material of the cover member 3 that covers the first input button group 31. In other words, when the cover member 3 for use outside the medical institution is attached to the main body 2, the patient or the like can perform operations to turn the power on and off and start and stop the liquid delivery.

The cover member 3 can be attached to the main body 2 by sandwiching the main body 2 at both ends. In this embodiment, the cover member 3 can be attached to the main body 2 by sandwiching the main body 2 at both ends in the x-axis direction.

Here, the manner in which the cover member 3 is attached to the main body 2 will be described. FIG. 4 is a partially enlarged view of the syringe pump 1 shown in FIG. 2 in an open state. Specifically, FIG. 4 is an enlarged view of a portion of the syringe pump 1 in FIG. 2 where the main body 2 and the cover member 3 are joined on the x-axis positive side. As shown in FIG. 4, the main body 2 has a joint protrusion 22 protruding from the side of the main body 2. The side is one or both of the side surfaces of the main body 2 in the x-axis positive direction and the negative direction. In the example shown in FIG. 4, the main body 2 has a joint protrusion 22 protruding to the x-axis positive direction side on the wall surface 21, which is the side wall on the x-axis positive direction side. In addition, the cover member 3 has a through hole 35 on the side of the cover member 3 into which the joint protrusion 22 can be inserted. In the example shown in FIG. 4, the cover member 3 has a through hole 35 on the wall surface 34, which is the side wall on the x-axis positive direction side, into which the joint protrusion 22 can be inserted. In this embodiment, the main body 2 and the cover member 3 also have the same joint protrusion 22 and through hole 35 on the negative x-axis side. That is, the joint protrusion 22 of the main body 2 and the through hole 35 of the cover member 3 are formed symmetrically with respect to the yz plane when the syringe pump 1 is viewed from the front. The cover member 3 can be attached to the main body 2 by inserting the joint protrusions 22 formed on both sides of the main body 2 into the through holes 35 formed on both sides (i.e., the sides on the positive and negative x-axis sides). Specifically, when the cover member 3 is attached to the main body 2, the cover member 3 is curved to widen the distance between the through holes 35 on both ends compared to the distance between the through holes 35 on both ends when no force is applied to the cover member 3. In this state, the left and right joint protrusions 22 of the main body 2 are inserted into the left and right through holes 35, respectively, and the cover member 3 is returned to a state in which no force is applied. In this manner, the cover member 3 can be attached to the main body 2.

When removing the cover member 3 from the main body 2, the cover member 3 is bent to widen the distance between the through holes 35 at both ends compared to the distance between the through holes 35 at both ends when no force is applied to the cover member 3. In this way, the insertion state of the through holes 35 into the joint protrusions 22 can be released, and the cover member 3 can be removed from the main body 2. In this way, the cover member 3 is configured to be detachable from the main body 2.

When the cover member 3 is attached to the main body 2 as in this embodiment, the axis A, which is the rotation axis of the cover member 3, is an axis that passes through the joint protrusions 22 on both sides, as shown in Figure 4. In other words, in this embodiment, the cover member 3 can be switched between a closed state and an open state by rotating relative to the main body 2 about the axis A that passes through the joint protrusions 22 on both sides.

The manner in which the cover member 3 is attached to the main body 2 is not limited to the manner described in this embodiment. The cover member 3 may be configured so as to be attachable to the main body 2 by sandwiching the main body 2 at both ends.

One of the body 2 and the cover member 3 of the syringe pump 1 has a protrusion that protrudes toward the other side of the body 2 or the cover member 3 in the closed state. In the present embodiment, the following description will be given assuming that the cover member 3 has a protrusion 36 that protrudes toward the body 2 in the closed state.

Figure 5 is a partial enlarged view of the B-B cross section of the syringe pump 1 in an open state. Figure 6 is a partial enlarged view of the C-C cross section of the syringe pump 1 in a closed state. The partial cross section shown in Figure 5 and the partial cross section shown in Figure 6 show the same part of the syringe pump 1, with Figure 5 showing the open state and Figure 6 showing the closed state. Note that in Figures 5 and 6, detailed descriptions of the internal mechanism in the cross section of the main body 2 have been omitted in order to clearly explain the features of the syringe pump 1 according to this embodiment.

As shown in FIG. 4, the cover member 3 has a protrusion 36. In this embodiment, the protrusion 36 is formed at the ends of the cover member 3 in the positive and negative directions along the x-axis. As shown in FIG. 4, the main body 2 has a storage section 23. The storage section 23 is configured as a storage space capable of storing the protrusion 36 in a closed state. In particular, the storage section 23 is configured to be capable of restricting the displacement of the protrusion 36 in the x-axis direction when the protrusion 36 is stored therein. In this embodiment, the storage section 23 is formed at the ends of the main body 2 in the positive and negative directions along the x-axis, corresponding to the position where the protrusion 36 is formed.

In this embodiment, as shown in FIG. 4, when the protrusion 36 is accommodated in the accommodation portion 23, the displacement of the protrusion 36 in the x-axis direction is restricted by the wall surface 21 and the outer wall 24. In this manner, the accommodation portion 23 is partitioned by at least the wall surfaces on the positive and negative x-axis sides (the wall surface 21 and the outer wall 24 in this embodiment), and these wall surfaces restrict the displacement of the protrusion 36 in the x-axis direction in the closed state.

In this embodiment, the syringe pump 1 has such a configuration of the protrusion 36 and the storage section 23 symmetrically. In other words, the protrusion 36 is formed on both ends of the cover member 3. Similarly, the storage section 23 is formed on both ends of the main body 2.

As shown in FIG. 6, in the closed state, the protrusion 36 is accommodated in the accommodation portion 23. Therefore, in the closed state, the displacement of the protrusion 36 in the x-axis direction is restricted by the wall surface 21 and the outer wall 24, which is shown imaginarily by the dashed line. Therefore, in the closed state, the displacement of the protrusion 36 in the x-axis direction is restricted, and therefore the cover member 3 cannot be bent, and the cover member 3 cannot be removed from the main body 2.

On the other hand, as shown in FIG. 5, in the open state, the protrusion 36 is located outside the storage section 23. Therefore, in the open state, the displacement of the protrusion 36 in at least one direction along the x-axis (the positive x-axis direction in the example shown in FIG. 5) is not restricted by the outer wall 24, which is virtually shown by the dashed line. Therefore, in the open state, the syringe pump 1 can bend the cover member 3, and therefore the cover member 3 can be removed from the main body 2.

In this way, according to the syringe pump 1 of this embodiment, the cover member 3 does not fall off the main body 2 in the closed state, and the cover member 3 can be configured to be removable from the main body 2 in the open state. This makes it easier to maintain the cover member 3 attached to the main body 2.

In addition, according to the syringe pump 1 of this embodiment, a structure can be realized in which the cover member 3 does not fall off the main body 2 in the closed state due to the protrusion 36 provided on the cover member 3 and the storage section 23 provided on the main body 2, so that it is possible to prevent the cover member 3 from falling off in the closed state without providing a separate mechanism in the syringe pump 1.

In addition, according to the syringe pump 1 of this embodiment, the main body 2 has a joint protrusion 22 protruding from the wall surface 21, and the cover member 3 has a through hole 35 in the wall surface 34 into which the joint protrusion 22 can be inserted, and when the joint protrusion 22 is inserted into the through hole 35, it can rotate relative to the main body 2 about an axis passing through the joint protrusion 22 as the rotation axis. In other words, the joint protrusion 22 and the through hole 35 can realize a hinge function. Therefore, there is no need to provide a separate mechanism for the hinge function, and the configuration can be simplified.

In the above embodiment, the protrusion 36 is described as being formed at the ends of the cover member 3 in the positive and negative directions of the x-axis. However, the protrusion 36 does not necessarily have to be formed at the ends of the cover member 3 in the positive and negative directions of the x-axis. The protrusion 36 may be formed at any position in the x-axis direction of the cover member 3, for example. For example, the protrusion 36 may be formed in the center of the cover member 3 in the x-axis direction. The main body 2 has a storage section 23 that stores the protrusion 36 at a position corresponding to the position where the protrusion 36 is formed. As a result, regardless of the position where the protrusion 36 is formed, in the closed state, the protrusion 36 is stored in the storage section 23, so that the displacement of the protrusion 36 in the x-axis direction is regulated. Therefore, the cover member 3 can be more easily maintained in the attached state to the main body 2.

However, it is preferable that the protrusions 36 are formed at the ends in the positive and negative x-axis directions. The closer the protrusions 36 are formed to the ends, the more deformation of the cover member 3 at positions closer to the ends is restricted. This makes it more difficult for the cover member 3 to fall off the main body 2 in the closed state.

In particular, when the protrusions 36 and the storage sections 23 are formed on both ends as in the above embodiment, the displacement of the cover member 3 at the positions where the joining protrusions 22 and the through holes 35 that maintain the cover member 3 attached to the main body 2 are located can be restricted, making it even more difficult for the cover member 3 to fall off the main body 2 in the closed state.

In the above embodiment, the main body 2 is described as having the storage section 23, and the cover member 3 is described as having the protrusion 36. However, the main body 2 may have a structure equivalent to the protrusion 36, and the cover member 3 may have a structure equivalent to the storage section 23. In other words, the main body 2 may have a protrusion that protrudes toward the cover member 3 in the closed state, and the cover member 3 may have a storage section that stores the protrusion in the closed state. With such a structure, it is possible to obtain the same effect as the above embodiment.

In the above embodiment, the syringe pump 1 has been described as having the protrusion 36 and the storage section 23 on the left and right. That is, the syringe pump 1 according to the above embodiment has the protrusion 36 and the storage section 23 in two locations. However, it is sufficient for the syringe pump 1 to have the protrusion 36 and the storage section 23 in at least one location. By having the protrusion 36 and the storage section 23 in one location, it becomes easier to prevent the cover member 3 from falling off in the closed state. In addition, the syringe pump 1 may have the protrusion 36 and the storage section 23 in three or more locations.

In the above embodiment, the syringe pump 1 may further include a locking mechanism for fixing the cover member 3 in the closed state. The locking mechanism may be any mechanism capable of fixing the cover member 3 in the closed state. For example, the main body 2 may be configured to be able to switch between a state in which the lock pin is protruding from the main body 2 and a state in which the lock pin is stored inside the main body 2 using a dedicated key, and the cover member 3 may have an insertion hole into which the lock pin can be inserted when the lock pin is protruding from the main body 2. In this case, when the lock pin is protruding from the main body 2 in the closed state, the lock pin is inserted into the insertion hole of the cover member 3, and the closed state is fixed. When the lock pin is stored inside the main body 2, the lock pin is not inserted into the insertion hole of the cover member 3. This releases the fixation of the closed state, and the cover member 3 becomes rotatable relative to the main body 2, and can be switched to the open state. In this way, both the attachment and detachment of the cover member 3 and the locking of the closed state in the syringe pump 1 can be realized.

For example, when the syringe pump 1 is used in a medical institution, the uncolored, transparent cover member 3 for use in a medical institution is attached to the main body 2 for use. In this case, the cover member 3 is not fixed in the closed state. A medical professional opens the cover member 3 as necessary and performs a specified input operation on the first input button group 31 and the second input button group 32 of the main body 2.

When the syringe pump 1 is used outside a medical institution, such as at a patient's home, a medical professional replaces the cover member 3 attached to the syringe pump 1 from the uncolored transparent cover member 3 for use inside a medical institution to a colored transparent cover member 3 for use outside a medical institution. Then, a special key is used to fix the cover member 3 in the closed state. This allows the patient to operate the first input button group 31, but cannot touch the syringe or the second input button group 32, so the syringe will not be moved inadvertently and the setting information will not be changed. In this way, safety can be ensured when the syringe pump 1 is used outside a medical institution.

The present invention is not limited to the configurations specified in the above-mentioned embodiments, and various modifications are possible without departing from the spirit of the invention described in the claims. For example, the functions contained in each component can be rearranged so as not to cause logical contradictions, and multiple components can be combined into one or divided.

This disclosure relates to a syringe pump.

1: Syringe pump 2: Main body 3: Cover member 11: Placement portion 12: Slider 13: Push-in fixing portion 14: Clamp 15: Cylinder flange holder 21, 34: Wall surface 22: Joint protrusion portion 23: Storage portion 24: Outer wall 31: First input button group 31a: Power button 31b: Start/stop button 32: Second input button group 33: Display portion 35: Through hole 36: Protrusion 46: Housing

Claims (8)

A main body capable of accommodating a syringe and including a drive mechanism for driving the syringe and a joint protrusion protruding from a side surface ;
a cover member that is switchable between a closed state in which the drive mechanism is covered and an open state in which the drive mechanism is not covered, that can be attached to the main body by sandwiching the main body at both ends, that has a through hole on a side into which the joining protrusion can be inserted, and that, in an inserted state in which the joining protrusion is inserted into the through hole, can rotate relative to the main body about an axis passing through the joining protrusion as a rotation axis to switch between the open state and the closed state,
the cover member includes a protrusion that protrudes toward the main body in the closed state,
the main body includes a housing portion that houses the protrusion in the closed state ,
The storage section is defined by two opposing wall surfaces of the main body,
In the closed state, the two wall surfaces sandwich the protrusion between themselves and restrict the displacement of the protrusion, thereby restricting the deformation of the cover member so as to release the inserted state.
Syringe pump. The syringe pump of claim 1, wherein the protrusion is located outside the housing in the open state. The main body further includes an operation unit for performing an input operation related to drive control by the drive mechanism,
The cover member further covers the operation unit in the closed state.
3. The syringe pump according to claim 1 or 2. The syringe pump according to claim 3, wherein the operation unit has a first operation unit that allows input operation in the closed state and a second operation unit that does not allow input operation. The syringe pump according to claim 4, wherein the portion of the cover member that covers the first operating part is made of a soft material. The syringe pump according to claim 1 , wherein the protrusion is formed on an end of the cover member. The syringe pump according to claim 6 , wherein the protrusions are formed on both ends of the cover member. The syringe pump according to claim 1 , further comprising a locking mechanism for fixing the closed state.

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