Liquid injector

Abstract

To provide an example of a liquid injector capable of injecting a liquid to an object while suppressing an inner pressure rise of the object with a simple mechanism.SOLUTION: A liquid injector 1 includes at least a first syringe 2, a second syringe 3, a pusher 4, a plunger 5, an operation part 6 and the like. When the operation part 6 is operated by pressing in a direction of an arrow, the pusher 4 and the plunger 5 are simultaneously displaced in the direction of the arrow. In this case, the pusher 4 is displaced in a direction to reduce a volume of a portion where the liquid is stored. The plunger 5 is displaced in a direction to increase a volume of a space communicating with an inflow port 3A.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a fluid injector for injecting a fluid (for example, a liquid such as a cleaning liquid or a chemical solution, or a gas such as air or a gas) into an object while suppressing an increase in the internal pressure of the object. [Background technology]

[0002] For example, when performing intraocular replacement (irrigation, drug injection, air / gas replacement, etc.) as an ophthalmic procedure, it is necessary to inject fluids such as irrigation solutions, drug solutions, air, gas, etc. into the eyeball while suppressing an increase in intraocular pressure. For this reason, conventionally, methods such as (a) the surgeon alternately injecting fluid into the eyeball and aspirating fluid from the eyeball, or (b) a machine built into the surgical device automatically performs these tasks have been used. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 6621858 Summary of the Invention [Problem to be solved by the invention]

[0004] In view of the above, the present disclosure discloses an example of a fluid injector that is capable of injecting a fluid into an object while suppressing an increase in the internal pressure of the object using a simple mechanism. [Means for solving the problem]

[0005] A fluid injector for injecting a fluid into an object while suppressing an increase in the internal pressure of the object preferably includes at least one of the following components, for example. That is, the constituent elements are a cylindrical first syringe (2) that stores a fluid to be injected into the target object, the first syringe (2) having an injection port (2A) for the fluid at one longitudinal end thereof; a piston-shaped plunger (4) displaceably stored in the first syringe (2), the plunger (4) reducing the volume of the portion storing the fluid when displaced toward the injection port (2A); a cylindrical second syringe (3) that has an inlet (3A) through which the fluid present in the target object can flow; and a piston-shaped absorber (5) displaceably stored in the second syringe (3), the absorber (5) displacing when the plunger (4) displaces in a direction that reduces the volume, displacing in a direction away from the inlet (3A) in conjunction with the displacement of the plunger (4), thereby expanding the volume of the space communicating with the inlet (3A).

[0006] As a result, in the fluid injector (1), the plunger (4) and the suction rod (5) are displaced in conjunction with each other, so that the same amount of fluid as that injected from the first syringe (2) can be sucked into the second syringe (3).

[0007] Therefore, with a simple configuration, it may be possible to inject a fluid into an object while suppressing an increase in the internal pressure of the object. For example, when the fluid injector is used for intraocular replacement, it becomes possible to inject a fluid such as an irrigation solution, a medicinal solution, air, or gas into the eyeball while suppressing an increase in intraocular pressure.

[0008] Incidentally, the symbols in the parentheses above are examples showing the correspondence with the specific configurations, etc. described in the embodiments described below, and the present disclosure is not limited to the specific configurations, etc. shown by the symbols in the parentheses above. [Brief explanation of the drawings]

[0009] [Figure 1] 1A and 1B are diagrams showing a fluid injector according to a first embodiment. [Figure 2] FIG. 10 shows a fluid injector according to a second embodiment. [Figure 3] FIG. 10 is a diagram showing an injection needle according to a third embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0010] The following "Embodiments of the Invention" are examples of embodiments that fall within the technical scope of the present disclosure. In other words, the invention-specific matters set forth in the claims are not limited to the specific configurations, structures, etc. shown in the following embodiments.

[0011] Note that arrows and diagonal lines indicating directions in each figure are provided to facilitate understanding of the relationship between the figures and the shapes of each component or part. Therefore, the inventions disclosed in this disclosure are not limited to the directions indicated in each figure. Diagonal lines do not indicate cross-sectional views.

[0012] At least one of each element or portion described with a reference numeral is provided unless otherwise specified, such as "one." In other words, unless otherwise specified, two or more elements may be provided. The fluid injector disclosed in the present disclosure includes at least the elements or portions described with a reference numeral.

[0013] (First embodiment) <1. Overview of Fluid Injector> In this embodiment, an example of a fluid injector according to the present disclosure is applied to a fluid injector used for intraocular replacement. Specifically, the fluid injector according to this embodiment is a fluid injector for injecting a fluid such as a cleaning solution, a medicinal solution, air, or gas into an object, such as an eyeball, while suppressing an increase in the internal pressure of the object.

[0014] 1.1 Configuration of the fluid injector 1, the fluid injector 1 includes at least a first syringe 2, a second syringe 3, a plunger 4, a plunger 5, and an operating unit 6. The first syringe 2 is a cylindrical member that contains a fluid to be injected into the eyeball, which is the subject.

[0015] An injection port 2A for the fluid is provided at one longitudinal end (the lower end in FIG. 1) of the first syringe 2. The second syringe 3 is a cylindrical member provided with an inlet 3A through which the fluid present in the object can flow in.

[0016] In this embodiment, the first syringe 2 and the second syringe 3 are arranged in positions where their longitudinal directions are parallel to each other. The inlet 3A is provided at the other longitudinal end of the second syringe 3, at a position corresponding to the other longitudinal end of the first syringe 2.

[0017] Specifically, in Fig. 1, the injection port 2A is provided at the lower end in the longitudinal direction of the first syringe 2. In Fig. 1, the inlet 3A is provided at the upper end in the longitudinal direction of the second syringe 3. The injection port 2A and the inlet 3A are connected to the injection needle N1 via flexible tubes T1 and T2.

[0018] The injection needle N1 according to this embodiment has a tip opening H1 communicating with the tube T1 and a tip opening H2 communicating with the tube T2. The tip opening H1 and the tip opening H2 are open in different directions.

[0019] The plunger 4 is a piston-shaped member that is displaceably housed within the first syringe 2. When the plunger 4 is displaced toward the injection port 2A, the volume of the portion where the fluid is housed decreases.

[0020] The plunger 5 is a piston-shaped member displaceably housed within the second syringe 3. The plunger 5 is configured to displace in a direction away from the inlet 3A in conjunction with the displacement of the plunger 4 when the plunger 4 is displaced toward the injection port 2A.

[0021] Therefore, when the plunger 4 is displaced in a direction that reduces the volume of the area where the fluid is stored, the plunger 5 is displaced in conjunction with the displacement of the plunger 4 in a direction that expands the volume of the space that communicates with the inlet 3A.

[0022] Specifically, the operating unit 6 is mechanically connected to the plunger 4 and the plunger 5 via rods 4A and 5A, respectively. Therefore, when the operating unit 6 is displaced in the vertical direction on the paper, the plunger 4 and the plunger 5 are simultaneously displaced in the vertical direction.

[0023] 1, the plunger 4 and plunger 5 are simultaneously displaced in the direction of the arrow. At this time, the plunger 4 is displaced in a direction that reduces the volume of the portion containing the fluid. The plunger 5 is displaced in a direction that expands the volume of the space communicating with the inlet 3A.

[0024] 2. Features of the Fluid Injector According to the Present Embodiment In the fluid injector 1 according to this embodiment, the plunger 4 and the plunger 5 are displaced in conjunction with each other, so that the same amount of fluid as that injected from the first syringe 2 can be sucked into the second syringe 3 .

[0025] Therefore, with a simple configuration, it may be possible to inject a fluid into an object while suppressing an increase in the internal pressure of the object. In other words, when the fluid injector 1 is used for intraocular replacement, it becomes possible to inject a fluid such as a cleaning solution, a medicinal solution, air, or gas into the eyeball while suppressing an increase in intraocular pressure.

[0026] (Second embodiment) In the above-described embodiment, the fluid injector is of the type in which the practitioner pushes the operating unit 6. In contrast, the fluid injector 10 according to this embodiment is of the type in which the practitioner pulls the operating unit 6.

[0027] That is, as shown in Fig. 2, the fluid injector 10 according to this embodiment at least includes a first syringe 12, a second syringe 13, a plunger 14, an intake pipe 15, and an operating unit 6. The first syringe 12 corresponds to the first syringe 2. The second syringe 13 corresponds to the second syringe 3. The plunger 14 corresponds to the plunger 4. The intake pipe 15 corresponds to the intake pipe 5.

[0028] Rods 14A and 15A connect operating part 6 to plunger 14 and plunger 15. Therefore, when operating part 6 is displaced in the vertical direction on the paper, plunger 4 and plunger 5 are simultaneously displaced in the vertical direction.

[0029] Specifically, when the operating unit 6 is displaced upward in the plane of the drawing, the plunger 14 and the plunger 15 are simultaneously displaced upward. As a result, the volume of the space V1 defined by the first syringe 12 and the plunger 14 decreases, and at the same time, the volume of the space V2 defined by the second syringe 13 and the plunger 15 increases.

[0030] Therefore, while the fluid is supplied from the injection port 12A via the tube T1 to the tip port H1, i.e., the object, the fluid in the object flows from the tip port H2 via the tube T2 into the inlet 13A, i.e., the second syringe 13.

[0031] That is, in this embodiment as well, when the practitioner pulls on operating unit 6, plunger 14 and plunger 15 are displaced in conjunction with each other, so that the same amount of fluid as that injected from first syringe 12 can be sucked into second syringe 13. Therefore, with a simple configuration, fluid injector 10 according to this embodiment can also inject fluid into an object while suppressing an increase in the internal pressure of the object.

[0032] (Third embodiment) In the above-described embodiment, intraocular replacement is performed using an injection needle N1 having two tip ports H1 and H2. In contrast, this embodiment is an example of intraocular replacement using general injection needles N2 and N3 having one tip port, as shown in FIG.

[0033] That is, in this embodiment, the injection needle N2 connected to the tube T1 and the injection needle N3 connected to the tube T2 are injected into the eyeball to perform intraocular replacement. Note that the fluid injector 1 has the same configuration as in the above-described embodiment.

[0034] (Other embodiments) The operating unit 6 according to the above-described embodiment is configured to simultaneously displace the plunger 4 and the plunger 5 in the same direction. However, the present disclosure is not limited to this. That is, the present disclosure may be configured, for example, so long as the plunger 5 is displaced in a direction to increase the volume when the plunger 4 is displaced in a direction to decrease the volume.

[0035] In the above-described embodiment, an example of a fluid injector according to the present disclosure is applied to a fluid injector used for intraocular replacement. However, the present disclosure is not limited to this. Although the tubes T1 and T2 in the above-described embodiments are flexible, the present disclosure is not limited to this.

[0036] Furthermore, the present disclosure is not limited to the above-described embodiments as long as it conforms to the spirit of the disclosure described in the above-described embodiments. Therefore, the present disclosure may be a configuration in which at least two of the above-described embodiments are combined, or a configuration in which any of the components illustrated or described with reference numerals in the above-described embodiments is eliminated. [Explanation of symbols]

[0037] 1…Fluid injector 2... First syringe 2A… Injection port 3... Second syringe 3A… Inlet 4... Pusher 5… sucker 6…Operation unit

Claims

1. A fluid injector for injecting a fluid into an object while suppressing an increase in the internal pressure of the object, a cylindrical first syringe containing a fluid to be injected into a target object, the first syringe having an injection port for the fluid at one end in a longitudinal direction; a piston-shaped plunger displaceably accommodated in the first syringe, the plunger reducing the volume of a portion where the fluid is accommodated when displaced toward the injection port; a cylindrical second syringe provided with an inlet through which fluid present in the object can flow; a piston-shaped plunger displaceably housed in the second syringe, which, when the plunger is displaced in a direction to reduce the volume, displaces in a direction away from the inlet in conjunction with the displacement, thereby expanding the volume of a space communicating with the inlet; A fluid injector comprising:

2. the first syringe and the second syringe are disposed in positions where their longitudinal directions are parallel to each other; the inlet is provided at a position on the other longitudinal end side of the second syringe that corresponds to the other longitudinal end side of the first syringe, 2. The fluid injector according to claim 1, further comprising an operating portion mechanically connected to the plunger and the plunger, the operating portion displacing the plunger and the plunger simultaneously in the same direction.

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