Liquid injection device

Abstract

The present application provides a liquid injection device, which is mainly composed of two liquid injection components, each of which has a container with a chamber with a variable volume formed therein, and a liquid drawing unit and a liquid discharge unit respectively connected to the chamber. By increasing the volume of the chamber, a negative pressure is generated inside the chamber, and liquid is injected into the chamber through the liquid drawing unit. By reducing the volume of the chamber, a positive pressure is generated inside the chamber, and the liquid in the chamber is discharged through the liquid discharge unit. Therefore, the present application realizes the continuous liquid injection function of the liquid injection device by alternately reducing the two chambers of the two liquid injection components so that the two liquid injection components discharge liquid in an alternating manner.

Description

Technical Field

[0001] The embodiments of the present application relate to the technical field of medical devices, and specifically to a medical continuous liquid injection device. Background Art

[0002] Urinary stones are one of the most common diseases in urology, with a prevalence rate of 1%-20% and are prone to recurrence. Although urinary stones are benign diseases, they may cause urinary tract infections, urinary tract hydrops, and even kidney damage. Therefore, urinary stones still pose a great threat to human health.

[0003] At present, minimally invasive treatment of urinary stones has become a routine means of treating urinary stones. In some large medical centers in China, more than 90% of urinary stone surgeries can be treated in a minimally invasive manner. However, the surgery itself may still cause harm to the patient. For example, the extension of the operation time may increase the risk of postoperative infection in the patient. Therefore, shortening the operation time and improving the efficiency of the operation are one of the important directions of research on minimally invasive intracavitary treatment devices for urinary stones.

[0004] In addition, during the minimally invasive intracavitary treatment of urinary stones, assistants (medical staff) are required to assist the surgeon in the "water injection" operation to ensure a clear surgical field of view, thereby facilitating the surgeon to perform the operation. However, the "water injection" operation requires the assistant to use a large-volume syringe to repeatedly pump and inject water, which often takes a lot of time and sometimes even requires two assistants (medical staff) to work together to pump and inject water, resulting in unnecessary waste of human resources and reducing surgical efficiency.

[0005] In view of this, how to provide a safe, efficient and easy-to-operate medical continuous water injection device to overcome the various problems existing in the prior art is the technical problem to be solved in this application. Summary of the invention

[0006] In view of the above problems, the main purpose of this application is to provide an injection device that can provide continuous injection of physiological saline for minimally invasive surgery of urinary stones, ensure a clear surgical field of view, improve surgical safety, and significantly reduce the workload of medical staff.

[0007] Another object of the present application is to provide a liquid injection device that can provide a fully closed liquid circuit to avoid exposure and contamination of the liquid.

[0008] Another object of the present application is to provide a liquid injection device which has the advantages of simple and easy operation and stable liquid injection.

[0009] The present application provides a liquid injection device, characterized in that it includes two liquid injection components, each of which has: a accommodating body, in which a chamber with a variable volume is formed, wherein when the volume of the chamber is reduced, a positive pressure is generated inside the chamber, and when the volume of the chamber is increased, a negative pressure is generated inside the chamber; and a liquid drawing unit and a liquid discharge unit, which are respectively connected to the chamber; wherein when a negative pressure is generated inside the chamber, liquid is injected into the chamber through the liquid drawing unit to perform a liquid drawing operation, and when a positive pressure is generated inside the chamber, the liquid in the chamber is discharged through the liquid discharge unit to perform a liquid injection operation; and wherein, by making the two chambers of the two liquid injection components shrink alternately, so that the two liquid discharge units of the two liquid injection components discharge the liquid in the two chambers in an alternating manner, continuous liquid injection of the liquid injection device is achieved.

[0010] Optionally, in an embodiment of the present application, when a force is applied to the accommodating body, the accommodating body contracts and the volume of the chamber decreases, and when the force is released, the accommodating body expands and the volume of the chamber increases.

[0011] Optionally, in an embodiment of the present application, the accommodating body is made of an elastic material having an elastic restoring force, so that when the force is released, the accommodating body automatically expands due to the elastic restoring force provided by the elastic material.

[0012] Optionally, in an embodiment of the present application, the injection assembly further has an elastic member, wherein when the force is applied to the accommodating body, the elastic member is deformed, and when the force is released, the deformed elastic member provides elastic force to the accommodating body so that the accommodating body automatically expands.

[0013] Optionally, in an embodiment of the present application, the liquid drawing unit and the liquid outlet unit are one-way valves, wherein when negative pressure is generated inside the chamber, the liquid drawing unit is in an open state and the liquid outlet unit is in a closed state, and when positive pressure is generated inside the chamber, the liquid drawing unit is in a closed state and the liquid outlet unit is in an open state.

[0014] Optionally, in an embodiment of the present application, the liquid injection device further comprises at least one three-way connector, which is respectively connected to the two liquid outlet units and / or the two liquid drawing units of the two liquid injection components.

[0015] Optionally, in an embodiment of the present application, the accommodating body is a bellows-shaped structure.

[0016] Optionally, in an embodiment of the present application, the injection assembly further includes an operating unit, which is an independent element disposed on the container body or the operating unit and the container body are integrally formed, wherein the operating unit is subjected to force to reduce the volume of the chamber in the container body.

[0017] Optionally, in an embodiment of the present application, the injection device also includes a linkage unit, which is respectively connected to the two operating units of the two injection components to cause the two chambers of the two injection components to produce linkage changes, wherein, when the volume of the chamber of one of the two injection components is reduced, the volume of the chamber of the other of the two injection components is increased.

[0018] Optionally, in an embodiment of the present application, the liquid injection device also includes a liquid supply device and an endoscope respectively connected via a catheter, so as to alternately inject the liquid provided by the liquid supply device into the two chambers via the two liquid drawing units of the two liquid injection components, and alternately discharge the liquid in the two chambers via the two liquid outlet units, so that the liquid is continuously injected into the endoscope.

[0019] It can be seen from the above technical solutions that the injection device provided in the embodiment of the present application provides a continuous injection function by alternately shrinking the two cavities of the two injection components so that the two cavities discharge liquid in an alternating manner. In a preferred embodiment, the present application can set a linkage unit so that the two chambers in the two injection components produce linkage changes, making the operation of the injection device of the present application simpler and more convenient and the liquid discharge stable. Compared with the prior art, the injection device of the present application can effectively reduce the time for switching syringes and assistants to repeat operations, thereby effectively shortening the operation time and improving the efficiency of the operation. In addition, the injection device of the present application can provide a fully closed liquid circuit, which can reduce the risk of surgery-related complications.

[0020] In other embodiments, the container of the present application may be made of an elastic material with elastic restoring force, so that when the force applied to the container is released, the elastic restoring force made of the elastic material can be used to make the squeezed container automatically expand, so as to automatically inject liquid into the emptied chamber. Therefore, it has the advantages of simple operation and controllable injection flow.

[0021] In another embodiment, a three-way connector may be provided to connect the liquid injection device and other related external equipment, thereby facilitating the connection and installation operation between the liquid injection device and the external related equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the embodiments of the present application. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0023] Figures 1 to 3 This is a schematic diagram of the first embodiment of the liquid injection device of the present application, wherein: Figure 1 and Figure 2 They are respectively a side sectional view and a side view of the liquid injection device of the first embodiment; Figure 3 It is a schematic diagram of an application embodiment of the liquid injection device of the first embodiment;

[0024] Figure 4 It is a side view schematic diagram of a second embodiment of the liquid injection device of the present application;

[0025] Figure 5 A side view schematic diagram of a third embodiment of the liquid injection device of the present application;

[0026] Figure 6 and Figure 7 They are respectively an overall schematic diagram and a side schematic diagram of a fourth embodiment of the liquid injection device of the present application; and

[0027] Figure 8 and Fig. 9 They are respectively an overall schematic diagram and a side sectional schematic diagram of the fifth embodiment of the liquid injection device of the present application.

[0028] Component number

[0029] 1 Liquid injection device

[0030] 10,20 Injection Components

[0031] 11,21 Container

[0032] 12,22 Chamber

[0033] 13,23 Liquid pumping unit

[0034] 14,24 Liquid outlet unit

[0035] 15,15a,15b Tee connector

[0036] 16a,16b Operation unit

[0037] 161a,161b Handle

[0038] 162a,162b Putter

[0039] 17 linkage unit

[0040] 18a,18b Handheld unit

[0041] 181a, 182a Grip

[0042] 181b,182b Grip

[0043] 19a, 19b Three-way valve

[0044] 191a,192a,191b,192b Valve port

[0045] 2 Liquid supply equipment (salt water bottle)

[0046] 3 Endoscope

[0047] 4,5 Catheter DETAILED DESCRIPTION

[0048] In order to enable those skilled in the art to better understand the technical solutions in the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments in the embodiments of the present application should fall within the scope of protection of the embodiments of the present application.

[0049] Please refer to Figure 1 and Figure 2 , which are different schematic diagrams of the first embodiment of the liquid injection device of the present application. The embodiment of the present application provides a liquid injection device 1, which can be connected to an external device (such as an endoscope) to provide a liquid injection operation for the external device (please describe in detail later). In the embodiment of the present application, the liquid is, for example, physiological saline used during surgery, however, it is not limited to this, and other liquids can also be applied to the liquid injection device 1 of the present application.

[0050] As shown in the figure, the liquid injection device 1 is mainly composed of two liquid injection components 10 and 20. In this embodiment, each liquid injection component 10 and 20 has a receiving body 11 and 21, a liquid drawing unit 13 and 23, and a liquid outlet unit 14 and 24 respectively.

[0051] A chamber 12, 22 with a variable volume is formed inside the accommodating body 11, 21, respectively, wherein the chamber 12, 22 is a relatively closed space. Therefore, when the volume of the chamber 12, 22 is reduced, a positive pressure can be generated inside the chamber 12, 22, and when the volume of the chamber 12, 22 is increased, a negative pressure is generated inside the chamber 12, 22.

[0052] In one embodiment, the container 11, 21 may be made of an elastic material with elastic restoring force, for example, the container 11, 21 is a balloon, but it is not limited to this, and other shapes and materials may also be applicable to the present application. When a force is applied to the container 11, 21 (for example, when squeezing the outer surface of the balloon), the container 11, 21 may be contracted to reduce the volume of the chamber 12, 22 inside the container 11, 21, and when the force applied to the container 11, 21 is released, the container 11, 21 may automatically expand due to the elastic restoring force provided by the elastic material, so that the volume of the chamber 12, 22 inside the container 11, 21 automatically increases. It should be noted that the above-mentioned force may be achieved, for example, by manual operation, but it is not limited to this, and in other embodiments, it may also be achieved, for example, by mechanical operation.

[0053] In another embodiment, an elastic member (not shown) may be provided to provide an elastic force for the accommodating bodies 11, 21. Specifically, when a force is applied to the accommodating bodies 11, 21, the elastic member is also squeezed and deformed simultaneously. When the force applied to the accommodating bodies 11, 21 is released, the deformed elastic member can provide an elastic force for the accommodating bodies 11, 21, so that the accommodating bodies 11, 21 automatically expand, and the volume of the chambers 12, 22 inside the accommodating bodies 11, 21 is automatically increased.

[0054] In addition, the liquid drawing units 13, 23 and the liquid discharge units 14, 24 are respectively connected to the two chambers 12, 22 of the two accommodating bodies 11, 21, wherein when the volume of the chambers 12, 22 is reduced to generate negative pressure therein, liquid can be respectively injected into the chambers 12, 22 through the liquid drawing units 13, 23 to perform a liquid drawing operation, and when the volume of the chambers 12, 22 is increased to generate positive pressure therein, the liquid stored in the chambers 12, 22 can be respectively discharged through the liquid discharge units 14, 24 to perform a liquid injection operation.

[0055] Please refer to Figure 2 and Figure 3 In this embodiment, one end of the liquid-drawing units 13, 23 can be connected to the chambers 12, 22 respectively, and the other end of the liquid-drawing units 13, 23 can be connected to a liquid supply device 2 (e.g., a saline bottle) through a conduit 4 to inject the liquid (e.g., saline) provided by the liquid supply device 2 into the chambers 12, 22. Similarly, one end of the liquid-discharging units 14, 24 is connected to the chambers 12, 22 respectively, and the other end of the liquid-discharging units 14, 24 is connected to the endoscope 3 through a conduit 5 to inject the liquid in the chambers 12, 22 into the endoscope 3.

[0056] In a specific embodiment, the liquid drawing units 13, 23 and the liquid outlet units 14, 24 are four one-way valves respectively, so as to control the flow direction of the liquid. When negative pressure is generated inside the chambers 12, 22, the liquid drawing units 13, 23 are in an open state under the action of the negative pressure, and the liquid outlet units 14, 24 are in a closed state under the action of the negative pressure. When positive pressure is generated inside the chambers 12, 22, the liquid drawing units 13, 23 are in a closed state under the action of the positive pressure, and the liquid outlet units 14, 24 are in an open state under the action of the positive pressure.

[0057] Thus, the present application can make the two chambers 12 , 22 of the two liquid injection components 10 , 20 shrink alternately, so that the two liquid outlet units 14 , 24 of the two liquid injection components 10 , 20 discharge the liquid in the two chambers 12 , 22 in an alternating manner.

[0058] Specifically, in actual operation, a force can be applied to the housing 21 while releasing the force applied to the housing 11, so that the volume of the chamber 22 inside the housing 21 is reduced, while the volume of the chamber 12 inside the housing 11 is increased. In this state, the negative pressure formed inside the chamber 12 can be used to unidirectionally inject the liquid in the saline bottle 2 into the chamber 12 through the liquid drawing unit 13, and the positive pressure formed inside the chamber 22 can be used to unidirectionally discharge the liquid in the chamber 22 through the liquid outlet unit 24 and inject it into the endoscope 3, that is, the liquid injection assembly 20 is used to perform the liquid injection operation on the endoscope 3. When the liquid in the chamber 21 is close to being emptied, the force applied to the housing 21 can be released, and the force can be applied to the housing 11, so that the volume of the chamber 12 inside the housing 11 is reduced, and the volume of the chamber 22 inside the housing 21 is increased. In this state, the negative pressure formed inside the chamber 22 can be used to unidirectionally inject the liquid in the saline bottle 2 into the chamber 22 through the liquid drawing unit 23, and at the same time, the positive pressure formed inside the chamber 12 can be used to unidirectionally discharge the liquid in the chamber 12 through the liquid outlet unit 14 and inject it into the endoscope 3, that is, the endoscope 3 is injected with liquid using the injection assembly 10. By alternately applying force to the injection component 10 and the injection component 20, the injection component 10 and the injection component 20 inject liquid into the endoscope 3 through the catheter 5 in an alternating manner, thereby enabling the endoscope 6 to continuously inject liquid into the human body during the operation to ensure the cleaning of the surgical field. Therefore, the injection device 1 of the present application can effectively improve the safety of the operation and reduce the workload of medical staff.

[0059] In one embodiment of the present application, the injection device 1 further includes at least one three-way connector 15 , which can selectively connect the two liquid outlet units 14 , 24 and / or the two liquid draw units 13 , 23 of the two injection components 10 , 20 respectively according to actual needs.

[0060] Please refer to Figure 4 In one embodiment, the injection device 1 may include a three-way connector 15, which can be connected to the liquid outlet unit 14 of the injection assembly 10 and the liquid outlet unit 24 of the injection assembly 20, so that the passages of the liquid outlet unit 14 and the liquid outlet unit 24 are merged and then connected to the liquid outlet unit 14 through a common conduit (not shown). Figure 3 The endoscope 3 shown is connected, thereby simplifying the connection operation between the injection device 1 and the endoscope 3.

[0061] It should be noted that the arrangement of the three-way connector 15 is not limited to Figure 4 The figure is limited to the figure. In other embodiments, the three-way connector 15 can also be connected to the liquid drawing unit 13 of the liquid injection component 10 and the liquid drawing unit 23 of the liquid injection component 20 respectively, so that the passages of the liquid drawing unit 13 and the liquid drawing unit 23 are merged and then connected to the liquid injection component 20 through a common conduit (not shown). Figure 3 The saline bottle 2 is connected to the liquid injection device 1, thereby simplifying the connection operation between the saline bottle 2 and the liquid injection device 1.

[0062] For better, please refer to Figure 8 and Fig. 9 In this embodiment, the liquid injection device 1 may include two three-way connectors 15a and 15b, wherein the three-way connector 15a is connected to the liquid drawing unit 13 of the liquid injection component 10 and the liquid drawing unit 23 of the liquid injection component 20, respectively, so that the passages of the liquid drawing unit 13 and the liquid drawing unit 23 are merged and then connected to the liquid drawing unit 13 and the liquid drawing unit 23. Figure 3 The three-way connector 15a is connected to the liquid outlet unit 14 of the liquid injection assembly 10 and the liquid outlet unit 24 of the liquid injection assembly 20, respectively, so that the passages of the liquid outlet unit 14 and the liquid outlet unit 24 are merged and then connected to the liquid outlet unit 14. Figure 3 The endoscope 3 shown is connected.

[0063] It should be noted that the housing 11, 21 of the present application can be designed as follows Figures 1 to 4 In addition to the balloon shown, it can also be designed as Figures 5 to 9 However, the invention is not limited thereto, and other container structures that can make the chambers 12, 22 formed inside the container 11, 21 have variable volumes can also be applied to the present application.

[0064] In other embodiments, an operating unit 16a, 16b is also provided on the injection assembly 10, 20, respectively. It should be noted that the arrangement method, arrangement position and arrangement quantity of the operating units 16a, 16b of the present application are not limited to those shown in the drawings of the present application. In other words, they can be changed according to actual needs. For example, the operating unit can be an independent operating element provided on the container 11, 21; in other embodiments, the operating unit can also be integrally formed with the container 11, 21, that is, the operating unit is a part of the container 11, 21, which only represents the best force application position when applying force to the container 11, 21.

[0065] See also Figure 5 In this embodiment, the operating unit 16a includes a handle 161a and a push rod 162a, and the operating unit 16b includes a push rod 161b and a push rod 162b. During operation, the user can apply force to the handles 161a and 161b alternately, so that the push rods 162a and 162b are forced to squeeze the accommodating bodies 11 and 21 with a bellows structure, respectively, so that the volume of the chambers 12 and 22 in the accommodating bodies 11 and 21 is reduced, thereby achieving the purpose of easily squeezing the accommodating bodies 11 and 21. In addition, when the user releases the force applied to the handles 161a and 161b, the accommodating bodies 11 and 21 with a bellows structure can automatically expand by the elastic restoring force provided by the elastic material, so that the external liquid is automatically injected into the chambers 12 and 22 through the negative pressure formed in the chambers 12 and 22 during the expansion process.

[0066] See also Figure 6 and Figure 7 In this embodiment, the operating units 16a, 16b are hand-held parts respectively arranged at the opposite side ends of the cavities 12, 22, and the injection device 1 also includes a linkage unit 17 (such as a connecting rod), which respectively connects the operating units 16a, 16b located at the opposite ends of the injection components 10, 20, so that when the volume of the chamber 12, 22 of one of the two injection components 10, 20 is reduced, the volume of the chamber 12, 22 of the other of the two injection components 10, 20 is increased, thereby causing a linkage change between the two chambers 12, 22 of the two injection components 10, 20.

[0067] Specifically, as shown in the figure, when the user applies a force to the operating unit 16a, for example, pushing the operating unit 16a to the right along the axial direction of the injection device 1, the linkage unit 17 can be moved to the right along the axial direction of the injection device 1, thereby driving the operating unit 16b to move to the right synchronously. In this state, the volume of the chamber 12 of the injection component 10 gradually decreases, while the volume of the chamber 22 of the injection component 20 gradually increases; conversely, when the user applies a force to the operating unit 16b, for example, pushing the operating unit 16a to the right along the axial direction of the injection device 1 When the operating unit 16b is pushed axially to the left, the linkage unit 17 can be moved to the left along the axial direction of the injection device 1, thereby driving the operating unit 16a to move to the left synchronously. In this state, the volume of the chamber 22 of the injection component 20 gradually decreases, while the volume of the chamber 12 of the injection component 10 gradually increases, so that the volume of the chamber 12 and the volume of the chamber 22 are linked by the linkage unit 17. This design can not only further simplify the operation, but also make the continuous liquid discharge of the injection device 1 more stable.

[0068] Please refer to Figure 8 and Fig. 9 , wherein the main structure of the injection device 1 of this embodiment is the same as that of the above embodiment, except that the injection device 1 is further provided with a handheld unit 18a, 18b, wherein a pair of protruding gripping portions 181a, 182a are formed on the handheld unit 18a, and a pair of protruding gripping portions 181b, 182b are also formed on the handheld unit 18b, so that the user can hold the gripping portions 181a, 182a and the gripping portions 181b, 182b with both hands respectively, thereby facilitating the application of force to the operating unit 16a and the operating unit 16b.

[0069] In addition, the present embodiment also utilizes a three-way valve 19a to integrate the liquid drawing unit 13 and the liquid outlet unit 14 of the liquid injection assembly 10, and the three-way valve 19a has two one-way flow valve ports 191a, 192a, wherein when a negative pressure is generated inside the chamber 12, the valve port 191a opens and the valve port 192a closes at the same time, and when a positive pressure is generated inside the chamber 12, the valve port 192a opens and the valve port 191a closes at the same time. Similarly, the liquid drawing unit 23 and the liquid outlet unit 24 of the liquid injection assembly 20 are also replaced by a three-way valve 19b, and the three-way valve 19b also has two one-way flow valve ports 191b and 192b, wherein when a negative pressure is generated inside the chamber 22, the valve port 191b opens and the valve port 192b is closed, and when a positive pressure is generated inside the chamber 22, the valve port 192b opens and the valve port 191b is closed, so that the overall structure of the liquid injection device 1 of the present application is further simplified by the above arrangement.

[0070] In actual operation, the user's hands can respectively hold the gripping parts 181a, 182a and the gripping parts 181b, 182b. When the user applies a force to the operating unit 16a, for example, by pushing the operating unit 16a to the right along the axial direction of the liquid injection device 1, the linkage unit 17 can be moved to the right along the axial direction of the liquid injection device 1, thereby driving the operating unit 16b to move to the right synchronously. In this state, the volume of the chamber 12 of the liquid injection assembly 10 gradually decreases, and a fluid is generated inside the chamber 12. Positive pressure is generated to open the valve port 192a of the three-way valve 19a and close the valve port 191a, thereby discharging the liquid in the chamber 12 through the valve port 192a and flowing out through the three-way connector 15b; at the same time, the volume of the chamber 22 of the injection assembly 20 gradually increases, and negative pressure is generated inside the chamber 22, so that the valve port 191b of the three-way valve 19b is opened and the valve port 192b is closed, thereby injecting the liquid flowing in from the three-way connector 15a into the chamber 22 through the valve port 191b.

[0071] On the contrary, when the user applies a force to the operating unit 16b, for example, by pushing the operating unit 16b to the left along the axial direction of the injection device 1, the linkage unit 17 can be moved to the left along the axial direction of the injection device 1, thereby driving the operating unit 16a to move to the left synchronously. In this state, the volume of the chamber 22 of the injection component 20 gradually decreases, and a positive pressure is generated inside the chamber 22, so that the valve port 192b of the three-way valve 19b is opened and the valve port 191b is closed, thereby discharging the liquid in the chamber 22 through the valve port 192b and flowing out through the three-way connector 15b. At the same time, the volume of the chamber 12 of the injection component 10 gradually increases, and a negative pressure is generated inside the chamber 12, so that the valve port 191a of the three-way valve 19a is opened and the valve port 192a is closed, thereby injecting the liquid flowing in from the three-way connector 15a into the chamber 12 through the valve port 191a.

[0072] Thus, the liquid injection device 1 of this embodiment uses the linkage unit 17 to make the volume of the chamber 12 and the volume of the chamber 22 change in linkage, so as to increase the stability and controllability of the liquid injection device 1 in performing continuous liquid injection operations. At the same time, by providing the handheld units 18a and 18b, it is convenient for the user to apply force to the operating unit 16a and the operating unit 16b. Furthermore, by using the three-way valves 19a and 19b to integrate the liquid drawing unit and the liquid discharge unit of the liquid injection assembly, the overall structure of the liquid injection device 1 can be simplified to reduce the complexity of the manufacturing work, thereby reducing the manufacturing cost.

[0073] In summary, the injection device of the present invention realizes the function of continuous injection by causing the two chambers of the two injection components to produce alternating changes. Compared with the existing syringe water injection, the present application is not only simple to operate, but also can ensure the stability and continuity of the water injection flow rate and pressure during the operation. In addition, it can also effectively reduce the time of switching syringes and assistants repeating operations, thereby effectively shortening the operation time, improving the efficiency of the operation, and reducing the risk of operation-related complications.

[0074] In addition, the liquid injection device of the present application can also provide a fully closed liquid passage, thereby avoiding exposure and contamination of the liquid during the operation, further improving the safety of the operation.

[0075] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the embodiments of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A liquid injection device, It is characterized in that include: Two liquid injection components, each of which has: a container, wherein a chamber with a variable volume is formed in the container, wherein when the volume of the chamber is reduced, a positive pressure is generated inside the chamber, and when the volume of the chamber is increased, a negative pressure is generated inside the chamber; and A liquid drawing unit and a liquid discharge unit, which are respectively connected to the chamber; When negative pressure is generated inside the chamber, liquid is injected into the chamber via the liquid pumping unit to perform a liquid pumping operation, and when positive pressure is generated inside the chamber, the liquid in the chamber is discharged via the liquid discharge unit to perform a liquid injection operation; and By making the two chambers of the two liquid injection components shrink alternately, the two liquid outlet units of the two liquid injection components discharge the liquid in the two chambers in an alternating manner, thereby achieving continuous liquid injection of the liquid injection device. The containers are independent of each other and arranged relative to each other. Each of the liquid injection components further includes an operating unit. The injection device also includes a linkage unit, which is arranged on the outside of the accommodating body and is respectively connected to the two operating units of the two injection components to cause the two chambers of the two injection components to produce linkage changes, wherein when the volume of the chamber of one of the two injection components is reduced, the volume of the chamber of the other of the two injection components is increased.

2. The liquid injection device according to claim 1, It is characterized in that When a force is applied to the accommodating body, the accommodating body contracts and the volume of the chamber decreases, and when the force is released, the accommodating body expands and the volume of the chamber increases.

3. The liquid injection device according to claim 2, It is characterized in that The accommodating body is made of an elastic material with elastic restoring force, so that when the acting force is released, the accommodating body automatically expands due to the elastic restoring force provided by the elastic material.

4. The liquid injection device according to claim 2, It is characterized in that The liquid injection assembly also has an elastic member, wherein when the force is applied to the accommodating body, the elastic member is deformed, and when the force is released, the deformed elastic member provides elastic force to the accommodating body, so that the accommodating body automatically expands.

5. The liquid injection device according to claim 1, It is characterized in that The liquid drawing unit and the liquid outlet unit are one-way valves, wherein when negative pressure is generated inside the chamber, the liquid drawing unit is in an open state and the liquid outlet unit is in a closed state, and when positive pressure is generated inside the chamber, the liquid drawing unit is in a closed state and the liquid outlet unit is in an open state.

6. The liquid injection device according to claim 1, It is characterized in that The liquid injection device further comprises at least one three-way connector, which is respectively connected to the two liquid outlet units or the two liquid drawing units of the two liquid injection components.

7. The liquid injection device according to claim 1, It is characterized in that The accommodating body is a bellows-shaped structure.

8. The liquid injection device according to any one of claims 1 to 7, It is characterized in that The operating unit is an independent element arranged on the accommodating body, or the operating unit and the accommodating body are integrally formed, wherein the operating unit is subjected to force to reduce the volume of the chamber in the accommodating body.

9. The liquid injection device according to any one of claims 1 to 7, It is characterized in that The liquid injection device also includes a liquid supply device and an endoscope respectively connected via a catheter, so that the liquid provided by the liquid supply device is alternately injected into the two chambers via the two liquid drawing units of the two liquid injection components, and the liquid in the two chambers is alternately discharged via the two liquid discharge units, so that the liquid is continuously injected into the endoscope.

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