JP6102095B2 - Liquid injector and liquid injection method - Google Patents

Description

  The present invention relates to a liquid injector and a liquid injection method.

  There are liquid injection devices that continuously inject liquid into the body. For example, as a liquid injection device used for continuous subcutaneous injection of a drug solution such as insulin, a liquid injection unit that injects insulin into the body by placing a catheter subcutaneously and a liquid supply unit that supplies insulin to the liquid injection unit Subcutaneous injectors are widely known. In such a hypodermic injector, a liquid feeding line for sending liquid from the liquid supply unit to the liquid injection unit may interfere with daily life. For this reason, a method has been used in which the liquid injection part and the liquid supply line are configured to be detachable, and the liquid supply line is connected to the liquid injection part only when the chemical liquid is injected. (For example, refer to Patent Document 1).

JP 2010-51702 A

In the liquid injection apparatus having such a configuration, bubbles may be generated when the liquid injection unit and the liquid supply line are attached or detached, or bubbles may be mixed into the liquid supplied from the liquid supply unit. If the bubbles flow into the liquid injection part as they are, the liquid feeding accuracy deteriorates and it becomes difficult to perform precise subcutaneous injection. In particular, in a tube pump that is frequently used as a liquid supply device when injecting a drug solution such as insulin, cavitation is generated by negative pressure when the tube performs a peristaltic motion, and bubbles are easily generated. Therefore, it is difficult to accurately control the liquid injection amount.
An object of the present invention is to provide a liquid injector capable of accurately injecting a liquid.

The main invention for achieving the above object includes a liquid storage part for storing a liquid, an injection pipe for injecting the liquid stored in the liquid storage part into a living body, and between the liquid storage part and the injection pipe. And a filter that allows the liquid to pass therethrough and does not allow gas to pass therethrough.
Other features of the present invention will become apparent from the description of the present specification and the accompanying drawings.

1 is a diagram illustrating an overall configuration of a liquid injection device 1. FIG. 2 is a schematic cross-sectional view of a liquid supply device 20. FIG. 2 is a schematic cross-sectional view of a liquid injector 50. FIG. It is a figure explaining the groove part provided in the filter holding surface of case 512A. FIG. 4 is a diagram illustrating a state in which a liquid supply device 20 is connected to a liquid injector 50. It is a figure showing the state by which the puncture device 30 was connected to the liquid injector 50. FIG. It is a figure showing the state of the liquid injector 50 at the time of liquid injection. FIG. 4 is a diagram for explaining the flow of liquid in the liquid injector 50. It is a figure explaining the flow of a liquid in the case of inject | pouring a liquid with the liquid injection apparatus of the comparative example 1. FIG.

  At least the following matters will become clear from the description of the present specification and the accompanying drawings.

A liquid storage part for storing a liquid; an injection pipe for injecting the liquid stored in the liquid storage part into a living body; and the liquid storage part and the injection pipe. A liquid injector comprising: a filter that does not pass through.
According to such a liquid injector, it becomes possible to inject a liquid with high accuracy.

In such a liquid injector, it is desirable that the gas blocked from flowing into the injection pipe by the filter remains in the liquid reservoir.
According to such a liquid injector, it is possible to suppress the gas mixed in the liquid reservoir from flowing into the injection tube (catheter), and a highly accurate liquid injection operation can be realized.

In this liquid injector, it is preferable that the liquid reservoir includes a septum that isolates the liquid reservoir from the outside air, and the liquid is supplied into the liquid reservoir via an injection needle that penetrates the septum.
According to such a liquid injector, it is possible to supply the liquid to the inside of the liquid reservoir while suppressing the gas from flowing into the liquid reservoir from the outside.

In this liquid injector, it is preferable that the injection needle penetrates the septum from a direction perpendicular to the filter and is inserted into the liquid reservoir.
According to such a liquid injector, restrictions on the arrangement of the septum and the shape of the liquid storage part are reduced, and the apparatus and the filter can be downsized.

This liquid injector has an abutment portion having a shape corresponding to a stepped portion provided in a liquid supply device that holds the injection needle, and the liquid is stored in the liquid storage portion via the injection needle. When being supplied, the stepped portion is brought into contact with the contact portion of the liquid supply device, so that the tip portion of the injection needle does not come into contact with the filter, so that the injection needle is placed in the liquid storage portion. It is desirable to adjust the amount inserted inside.
According to such a liquid injector, when the injection needle is inserted into the liquid reservoir, the filter can be prevented from being broken or damaged by the injection needle, and safer liquid injection can be performed. it can.

In such a liquid injector, it is desirable that the liquid holding device has a filter holding surface having a plurality of grooves, and the film-like filter is held by the filter holding surface.
According to such a liquid injector, the load (pressure) acting on the filter when the liquid and the gas are separated is dispersed, and the filter is hardly damaged. Further, by flowing the liquid after passing through the filter along the groove, it is possible to suppress the liquid from staying in the vicinity of the filter and to efficiently separate the liquid.

  Further, the liquid is stored in the liquid storage unit, the liquid is injected into the living body from the injection tube, and the liquid storage unit and the injection tube are provided between the liquid storage unit and the injection tube to pass the gas. A liquid injecting method comprising: moving the liquid stored in the liquid storing part to the injection tube through a filter that is not allowed to be revealed.

=== Embodiment ===
<About liquid injection device>
There is a liquid injection device that continuously injects a predetermined amount of liquid into a living body or the like. For example, in an insulin injection device used for continuous subcutaneous injection of insulin, a certain amount of insulin can be continuously injected into the living body (subcutaneous). In the present embodiment, liquid injection using the liquid injection apparatus 1 capable of accurately injecting liquid will be described.

FIG. 1 is a diagram illustrating the overall configuration of the liquid injection apparatus 1. The liquid injection device 1 includes a liquid supply device 20, a liquid injection device 50, and a puncture device 30 that is not shown in FIG. The puncture device 30 is a device used when the liquid injector 50 is attached to a living body.
At the time of liquid injection, the liquid injection device 1 is connected to a liquid feed pump 10 that is a power source.

  The liquid feed pump 10 is a liquid transport device serving as a power source for supplying a liquid to the liquid injector 50, and it is desirable that the liquid transport amount per unit time can be accurately controlled. As the liquid feed pump 10 of the present embodiment, for example, a tube pump that transports the liquid filled in the tube in the transport direction by sequentially pressing the tube with a plurality of fingers.

<Configuration of liquid supplier 20>
FIG. 2 is a schematic cross-sectional view of the liquid supply device 20. The liquid supplier 20 is a device for supplying the liquid transported by the liquid feed pump 10 to the inside of the liquid injector 50, and includes a liquid transport path 21 and a connection portion 22. The liquid supply device 20 is connected to the liquid injector 50 at the time of liquid injection, and is removed from the liquid injector 50 when the liquid injection is not performed. A method for connecting the liquid supply device 20 and the liquid injector 50 will be described later.

(Liquid transport path 21)
The liquid transport path 21 is a tubular member that transports the liquid sent by the liquid feed pump 10 toward the connection portion 22. The liquid transport path 21 of this embodiment is formed of a flexible resin or the like.

(Connection 22)
The connection portion 22 is a portion that is connected to the liquid injector 50 during liquid injection and supplies liquid to the inside of the liquid injector 50, and the liquid supplier 20 can be attached to and detached from the liquid injector 50 by the connection portion 22. It has become. The connection part 22 includes a connection injection needle 221 and a body part 222.

  The connection injection needle 221 supplies a liquid to the inside of the liquid injector 50 (a liquid storage section described later) when the liquid supplier 20 and the liquid injector 50 are connected. The connecting injection needle 221 is a circular and slender needle, and the liquid transported through the liquid transport path 21 flows through the connecting injection needle 221 and flows out from the tip.

  The body part 222 is a member that constitutes the exterior of the connection part 22 (liquid supply device 20), and holds the injection needle 221 in a predetermined position. Further, a stepped portion as shown in FIG. 2 is provided at the lower portion of the body portion 222.

<Configuration of liquid injector 50>
The liquid injector 50 is a device for injecting the supplied liquid into a living body or the like. FIG. 3 is a schematic cross-sectional view of the liquid injector 50. The liquid injector 50 includes a body part 51, a liquid injection part 52, a filter 53, and a septum 54.

(Torso 51)
The body portion 51 is a member that constitutes the exterior of the liquid injector 50, and the liquid injector 52, the filter 53, and the septum 54 are held therein. The body portion 51 includes a base 511, a case 512A, and a case 512B.

  The base 511 is a member formed of resin or the like, and holds a liquid injection part 52 (an injection pipe 521 and a communication path 522) to be described later (see FIG. 3). When injecting a liquid into a living body, the base 511 is fixed to the surface of the living body, and a part of the injection tube 521 is left in the body. That is, the base 511 also has a function as a mounting base when the liquid injector 50 is fixed to an object (for example, a living body) to be liquid injected. Moreover, the side (the lower left part of FIG. 3) which connects with the liquid supply device 20 in the bottom part of the base 511 becomes a contact part which protruded partially, and fixes a position when connecting the liquid supply device 20. Can do.

  The case 512A and the case 512B form a liquid storage part for temporarily storing the liquid supplied from the liquid supply device 20 in the liquid injection device 50 at the time of liquid injection. The liquid storage portion is a region (region indicated by a thick line portion in FIG. 3) surrounded by the case 512A, the case 512B, the filter 53, and a connection septum 541 described later, and is isolated from the outside (outside air). In addition, this is an airtight region.

  As shown in FIG. 3, a membrane-like filter 53 is held between the case 512A and the case 512B, and a surface of the case 512A on which the filter 53 is held (hereinafter also referred to as a filter holding surface) has a plurality of pieces. A groove (groove portion) is provided. FIG. 4 is a diagram illustrating a groove provided in the filter holding surface of case 512A. The filter holding surface of the case 512A has a plurality of grooves arranged in the horizontal direction. Each groove is connected to each other. For example, in the case of FIG. 4, each groove is connected on the left side. In addition, the groove located at the center of the groove part is formed wider than the other grooves, and a connection channel for moving the liquid to the liquid injection part 52 is provided on the bottom surface of the groove at the center part ( (See FIG. 3). Although details will be described later, the liquid stored in the liquid storage portion passes through the filter 53 and then flows into a groove portion provided in the case 512A. The liquid that has flowed into the groove portion gathers from the connecting portion of each groove into a thick groove in the central portion, and moves to the liquid injection portion 52 through the connection flow path. By holding the filter 53 with such a groove-shaped holding surface, the load (pressure) acting on the filter 53 is dispersed, and the filter 53 is not easily damaged. In addition, by flowing the liquid after passing through the filter 53 along the groove, it is possible to suppress the liquid from staying in the vicinity of the filter 53.

  In FIG. 4, the filter holding surface of the case 512A is formed in a circular shape, but the holding surface does not have to be circular. In FIG. 4, the plurality of grooves are provided in the horizontal direction, but may be grooves in the vertical direction. Further, the thickness, depth, quantity, and the like of the groove are changed according to the properties of the liquid to be injected (for example, a drug solution such as insulin).

  The case 512B holds the connection septum 541 so as to be fitted.

(Liquid injection part 52)
The liquid injection part 52 includes an injection pipe 521 and a communication part 522.
The injection tube 521 is a tube for injecting a liquid, and a catheter is used in this embodiment. A part of the injection pipe 521 is held by the base 511 of the body part 51, and a part is exposed below the base 511. When liquid is injected using the liquid injector 50, the exposed portion of the injection tube 521 is left inside the living body or the like, and the liquid can be continuously injected. Therefore, it is desirable that the injection tube 521 (catheter) is formed of a soft material such as a fluororesin in consideration of being placed in the living body.

  The communication part 522 is an introduction part for introducing a liquid into the injection pipe 521. A liquid (liquid to be injected such as insulin) that moves from the liquid reservoir through the connection channel is introduced into the injection tube 521 from the communication part 522 and injected into the living body.

(Filter 53)
The filter 53 is a film-like member that is held inside the body part 51 and is provided between the liquid storage part and the liquid injection part 52 (injection pipe 521). The filter 53 is formed of a hydrophilic material having a property of allowing liquid to pass but not allowing gas to pass. For example, a PTFE (Polytetrafluoroethylene) membrane subjected to hydrophilic treatment is used. In the present embodiment, the filter 53 suppresses the gas present in the liquid storage part from flowing into the liquid injection part 52 (injection pipe 521). Further, the filter 53 does not pass solids. That is, it also has a function of separating the liquid and the individual.

(Septum 54)
The septum 54 includes a connection septum 541 and a puncture septum 542.
The connection septum 541 is a member that isolates the liquid storage portion provided inside the body portion 51 from the outside air. When connecting the liquid supply device 20 to the liquid injection device 50 during liquid injection, the connection injection needle 221 of the liquid supply device 20 is penetrated. Therefore, even when the connecting injection needle 221 is penetrated, the connecting septum 541 is formed of a material (for example, silicone) that closes the hole opened by the penetration when the connecting injection needle 221 is pulled out. Is done. As a result, even if the connecting injection needle 221 is inserted into and removed from the connecting septum 541, the flow of gas from the outside into the liquid reservoir is suppressed.

  The puncture septum 542 is a member that isolates the injection tube 521 from the outside air. Further, when the injection tube 521 is inserted into the living body at the time of puncture described later, the puncture needle 31 of the puncture device 30 is penetrated. Therefore, even when the puncture needle 31 is penetrated, the puncture septum 542 is formed of a material (for example, silicone) that closes the hole opened by the penetration when the puncture needle 31 is removed.

<About liquid injection operation>
The liquid injection operation using the liquid injector 50 will be described with reference to an example in which the liquid injection target is a living body.

  When performing liquid injection, the liquid supply unit 20 is connected to the liquid injection unit 50. FIG. 5 is a diagram illustrating a state in which the liquid supply device 20 is connected to the liquid injector 50. In this embodiment, the liquid supply device 20 can be connected to the side of the liquid injector 50. When both are connected, the liquid supply device 20 is slid from the left side to the right side of FIG. Then, the connection injection needle 221 provided in the liquid supply device 20 passes through the connection septum 541 of the liquid injector 50 and is inserted into the liquid reservoir of the liquid injector 50. That is, the connecting injection needle 221 is inserted from a direction perpendicular to the filter 53 (with respect to the filter holding surface).

  Here, if the connection injection needle 221 is inserted in parallel with the filter 53, the arrangement of the connection septum 541 and the shape of the liquid storage part are likely to be restricted. Moreover, since the height of the liquid injector 50 is increased or the entire apparatus is enlarged, there is a possibility that it may interfere with daily life when attached to a living body. On the other hand, by inserting the connecting injection needle 221 from a direction perpendicular to the filter 53 as in this embodiment, the configuration of the liquid injector 50 becomes a compact shape as shown in FIG. The filter 53 itself can be downsized.

  The contact portion of the liquid injector 50 (base 511) has a shape corresponding to the stepped portion provided on the bottom surface portion of the liquid supply device 20 (body portion 222), and as shown in FIG. The contact position of the liquid supply device 20 with respect to the liquid injector 50 is fixed by contacting the stepped portion. Thereby, the amount by which the connecting injection needle 221 is inserted into the liquid reservoir of the liquid injector 50 in the connected state is adjusted. Specifically, the insertion amount of the connection injection needle 221 is adjusted so that the tip of the connection injection needle 221 does not come into contact with the filter 53 held in the liquid storage portion. By adjusting so that the connecting injection needle 221 and the filter 53 are not brought into contact with each other, the filter 53 can be prevented from being broken or damaged, and safer liquid injection can be performed.

  Next, the puncture device 30 is connected to the liquid injector 50. The liquid injector 50 is fixed to the living body using the puncture device 30, and a part of the injection tube 521 (catheter) is placed in the living body. As described above, since the injection tube 521 (catheter) is formed of a soft material such as fluororesin, it is difficult to insert the injection tube 521 alone into the body. Therefore, when attaching the liquid injector 50 to the living body, the puncture device 30 is used.

FIG. 6 is a diagram illustrating a state in which the puncture device 30 is connected to the liquid injector 50.
The puncture device 30 has a puncture needle 31. The puncture needle 31 is a hollow thin needle-like member, and the outer diameter thereof is smaller than the inner diameter of the injection tube 521. The puncture device 30 can be connected to the upper part of the liquid injector 50, and when connecting them, the puncture needle 31 is injected through the puncture septum 542 of the liquid injector 50 as shown in FIG. It is inserted into the tube 521. The length of the puncture needle 31 is adjusted so that the tip of the puncture needle 31 protrudes from the lower end of the injection tube 521 when the puncture device 30 is connected to the liquid injector 50.
The puncture device 30 and the liquid injector 50 may be connected before the liquid injector 50 and the liquid supply device 20 are connected.

  In this embodiment, before the liquid injector 50 is attached to the living body, the liquid to be injected (for example, insulin or the like) flows out from the distal end portion of the injection tube 521 (puncture needle 31) as shown in FIG. That is, the inside of the liquid transport path 21 and the connecting injection needle 221 of the liquid supply device 20 and the inside of the liquid storage portion and the injection tube 521 of the liquid injector 50 are filled with the liquid to be injected (this operation). Is called priming). By filling the liquid flow path with the liquid in advance, the gas remaining in the flow path is released, so that the gas can be made difficult to flow into the liquid injector 50. The puncture needle 31 inserted into the injection tube 521 is hollow and has a hole in the side. Therefore, in a state where the puncture needle 31 is inserted into the injection tube 521, the liquid flows out through the puncture needle 31.

  In this state, when the liquid injector 50 (and the puncture device 30, the liquid supply device 20) is attached to the living body from a direction perpendicular to the surface of the living body, the tip of the puncture needle 31 is stuck into the living body surface and gradually enters the living body. It will be inserted. At the same time, the injection tube 521 (catheter) is integrally inserted into the living body so as to be guided by the puncture needle 31. It is desirable that the tip of the injection tube 521 (catheter) be tapered so that the resistance during insertion is reduced. The liquid injector 50 is attached to the living body by bringing the bottom surface of the liquid injector 50 into close contact with the living body surface. An adhesive substance such as an adhesive tape is attached to the bottom surface portion of the liquid injector 50, and the position of the liquid injector 50 is fixed by the bottom surface portion being in close contact with the living body surface.

When the liquid injector 50 is fixed on the surface of the living body, the liquid can be injected into the living body. FIG. 7 is a diagram illustrating the state of the liquid injector 50 during liquid injection.
After the liquid injector 50 is attached to the living body, the puncture device 30 is detached from the liquid injector 50. When the puncture device 30 is moved so as to be pulled out vertically upward with respect to the living body, the puncture needle 31 inserted into the living body is removed, and a part of the injection tube 521 (catheter) is left in the living body. By doing so, as shown in FIG. 7, liquid injection can be performed using the liquid injector 50 in a state where the injection tube 521 (catheter) is left in the living body. In addition, after the puncture needle 31 is pulled out, the through-hole opened in the puncture septum 542 is closed, so that the injection tube 521 is blocked from the outside air. Therefore, outside air does not enter the inside of the injection tube 521 through the puncture septum 542 during the liquid injection operation. Further, liquid does not leak from the injection tube 521 to the outside.

  The liquid transported from the liquid feed pump 10 through the liquid transport path 21 of the liquid supplier 20 is supplied to the liquid reservoir inside the liquid injector 50 through the connection injection needle 221. Then, it passes through the filter 53 and moves to the groove, and is guided from the communication part 522 to the inside of the injection tube 521 and injected into the living body.

<About the flow of the liquid in the liquid injector 50>
The flow of the liquid in the liquid injector 50 at the time of liquid injection will be specifically described. FIG. 8 is a diagram for explaining the flow of the liquid in the liquid injector 50.
The liquid is supplied from the liquid feed pump 10 into the liquid reservoir through the connection injection needle 221. In the present embodiment, the connection injection needle 221 is inserted into the liquid reservoir through the connection septum 541 having high airtightness. Therefore, it is possible to accurately supply the liquid to the inside of the liquid reservoir while suppressing the gas from flowing into the liquid reservoir from the outside.

  However, while the liquid is transported from the liquid feed pump 10 to the liquid injector 50, there are cases where fine bubbles are mixed into the liquid being transported and the bubbles are supplied as they are into the liquid reservoir. In particular, when a tube pump is used as the liquid feed pump 10 as in this embodiment, when the tube compressed by the fingers is opened, negative pressure is generated in the tube, resulting in cavitation and bubbles. It becomes easy to do. Bubbles generated in this way are transported along the liquid transport path 21 together with the liquid to be injected, and are accumulated in the liquid reservoir.

  The interior of the liquid reservoir is gradually filled with the liquid and gas (bubbles) supplied via the connecting injection needle 221. As shown in FIG. 8, the gas accumulates above the liquid reservoir, and the other portions The liquid is stored. When liquid is further supplied from the connecting injection needle 221, the pressure in the liquid reservoir increases, and a part of the liquid passes through the filter 53 and moves to the groove of the case 512 </ b> A. At this time, since the filter 53 does not allow gas to pass therethrough, the gas in the liquid storage portion does not move to the groove portion of the case 512A. That is, the gas that is blocked from flowing into the injection pipe 521 by the filter 53 remains inside the liquid reservoir. Further, even if foreign matters other than gas are mixed in the liquid storage portion, such foreign matters are also separated by the filter 53 and do not move from the liquid storage portion to the groove portion.

  The liquid that has moved to the groove part of the case 512A moves to the liquid injection part 52 through the central connection channel, is introduced into the injection tube 521 (catheter) from the communication part 522, and is injected into the living body. Since the liquid easily flows along the groove portion, the liquid easily passes through the filter 53, and gas and other foreign matters can be efficiently separated at the time of liquid injection.

<Comparative example>
As a comparative example, a conventional liquid injection device without a filter will be described. FIG. 9 is a diagram for explaining the flow of the liquid when the liquid is injected by the liquid injection device according to the first comparative example.

  In the liquid injector of Comparative Example 1, the configurations of the liquid injector 1 of the embodiment and the liquid injector 50 are different. In the first comparative example, the filter 53 and the groove portion (filter holding surface) for holding the filter 53 are not provided inside the liquid injector 50. That is, in the comparative example 1, the region corresponding to the liquid storage part of the liquid injection device 1 and the liquid injection part 52 (injection pipe 521) are not separated.

  In the case of FIG. 9, the liquid supplied from the liquid feed pump 10 to the liquid injector 50 via the connection injection needle 221 at the time of liquid injection moves to the liquid injection unit 52 (injection tube 521) as it is. Therefore, even when a foreign substance such as a gas is mixed in the supplied liquid, the foreign substance such as the gas is directly introduced into the injection tube 521 and injected into the living body. Thus, when the liquid is injected while the gas is mixed in the liquid, the liquid injection amount is reduced by the amount of the mixed gas, and the accuracy of the liquid injection amount is deteriorated.

  On the other hand, in the present embodiment, even if bubbles are generated in the liquid feeding pump 10, the bubbles are separated when the liquid moves from the liquid storage portion to the liquid injection portion 52 (injection pipe 521) (FIG. 8). (See), the corresponding liquid moves to the injection tube 521. That is, the air bubbles mixed in the liquid can be replaced with the liquid and sent to the injection tube. Therefore, the accuracy of the liquid injection amount can be improved as compared with the comparative example.

  In addition, when liquid such as a chemical solution is injected into a living body, the liquid can be injected after removing gas and other foreign matters, so that safer liquid injection can be performed. For example, when injecting a chemical solution into a living body, it is possible to suppress the entry of allergic substances into the body.

=== Other Embodiments ===
Although the liquid injection apparatus as one embodiment has been described, the above-described embodiment is for facilitating the understanding of the present invention, and is not intended to limit the present invention. The present invention can be changed and improved without departing from the gist thereof, and it is needless to say that the present invention includes equivalents thereof. In particular, the embodiments described below are also included in the present invention.

<About liquid feed pump 10>
In the above-described embodiment, the example of using the tube pump that transports the liquid by causing a peristaltic motion in the tube by compressing the finger as the configuration of the liquid feeding pump 10 has been described. Is not limited to this example. For example, a roller pump that presses a tube by rotation of a roller, a syringe pump that transports liquid by moving a piston, or the like can also be used.

<About the liquid injector 50>
In the above-described embodiment, the example in which the liquid is injected into the living body using the liquid injector 50 has been described. However, the present invention is not limited to this example. The liquid injector 50 can accurately inject a liquid into an injection target other than a living body.

1 liquid injection device,
10 Liquid feed pump,
20 liquid supply, 21 liquid transport path, 22 connection,
221 connecting needle, 222 body,
30 puncture device, 31 puncture needle,
50 liquid injectors,
51 trunk, 511 base, 512A / 512B case,
52 liquid injection part, 521 injection pipe, 522 communication part,
53 filters,
54 Septum, 541 Septum for connection, 542 Septum for puncture

Claims (6)

A liquid reservoir for storing liquid;
An injection tube for injecting the liquid into the living body;
A filter that is provided between the liquid reservoir and the injection pipe and that allows the liquid to pass therethrough and shuts off the gas;
A filter holding surface provided with a plurality of grooves,
The plurality of grooves are connected to each other;
The liquid injector, wherein the filter is held by the filter holding surface. The liquid injector according to claim 1, comprising:
The liquid injector, wherein the gas blocked from flowing into the injection pipe by the filter remains in the liquid reservoir. The liquid injector according to claim 1 or 2, wherein
A septum for isolating the liquid reservoir from outside air;
The liquid injector, wherein the liquid is supplied into the liquid reservoir through an injection needle penetrating the septum. The liquid injector according to claim 3, wherein
In the septum, the liquid injector is characterized in that the injection needle penetrates from a direction perpendicular to the filter and is inserted into the liquid reservoir. The liquid injector according to claim 3 or 4, further comprising a contact portion,
The shape of the contact portion is a shape corresponding to a stepped portion provided in a liquid supply device that holds the injection needle,
When the liquid is supplied to the liquid reservoir through the injection needle, the injection needle is inserted into the liquid reservoir by bringing the stepped portion and the contact portion into contact with each other. A liquid injector characterized in that the amount is adjusted. A liquid injector according to any one of claims 1 to 5,
The groove at the center of the filter holding surface is formed wider than the other grooves, and a connection channel for moving liquid to the injection tube is provided at the bottom of the groove at the center. Liquid injector.