Bubble emptying mechanism for automatic medicine suction needle cylinder of injector

Abstract

The invention discloses a bubble emptying mechanism for an automatic medicine suction needle cylinder of an injector, and relates to the technical field of medical instruments. The contrast agent injector is applied to contrast agent injection and comprises a needle cylinder, a piston is coaxially arranged in the needle cylinder, the piston is in sliding connection with the needle cylinder, the top of the piston is fixedly connected with a push rod, and the outer diameter of the push rod is equal to the inner diameter of the needle cylinder; the side, away from the needle cylinder, of the piston is fixedly connected with an emptying pipe, the emptying pipe is located in the push rod, and the bottom end of the emptying pipe is connected with a one-way emptying assembly. Through mutual cooperation of the one-way valve plug, the ball core seat, the ball valve core, the emptying pipe and other structures, bubbles can be emptied upwards when the needle cylinder faces downwards, and the high-pressure injector can be applied to an intelligent high-pressure injection system; the problem that when a traditional needle cylinder and piston combination is emptied, a needle cylinder must be upwards made to push a piston to achieve upward emptying is solved, and the needle cylinder and piston combination can be combined with other automatic structures to complete the intelligent injection process.

Description

Technical Field

[0001] The invention relates to the technical field of medical devices, in particular to a bubble exhaust mechanism for an automatic drug aspiration syringe. Background Art

[0002] The contrast agent high-pressure syringe syringe in medical imaging equipment is mainly used to inject contrast agent in medical imaging examinations. Contrast agent is a special drug. By injecting it into the body, it can make certain tissues or organs more clearly visible in imaging examinations, thereby helping doctors to make a diagnosis. The design of the syringe needs to have good sealing performance to ensure that no drug leakage occurs during the injection process. After the drug is absorbed, air will inevitably enter the syringe to form bubbles, and the bubbles need to be discharged before the injection operation can be performed. However, the piston in the traditional piston structure is relatively fixed. When emptying, the direction of the syringe needs to be changed, and the syringe opening needs to be changed from downward to upward, and then the air is discharged. This operation will lead to a decrease in injection efficiency. Moreover, when used in an intelligent high-pressure injection system, the change of the direction of the syringe also requires the syringe to be disassembled first, and then the direction needs to be reversed for emptying and then reinstalled. The entire emptying process is cumbersome and time-consuming. For this reason, we propose a bubble emptying mechanism for the syringe that automatically absorbs drugs. Summary of the invention

[0003] The object of the present invention is to provide a bubble evacuation mechanism for a syringe cylinder for automatic drug aspiration, so as to solve the problems raised in the above-mentioned background technology.

[0004] To achieve the above-mentioned object, the present invention provides the following technical solution: a bubble evacuation mechanism for a syringe for automatic drug aspiration, which is applied to contrast agent injection, comprises a syringe, a piston is coaxially arranged inside the syringe, the piston is slidably connected to the syringe, a push rod is fixedly connected to the top of the piston, and the outer diameter of the push rod is equal to the inner diameter of the syringe;

[0005] The piston is fixedly connected to a drain pipe on one side away from the syringe, the drain pipe is located inside the push rod, and the bottom end of the drain pipe is connected to a one-way drain component, which is installed inside the piston and is interconnected with the drain pipe;

[0006] An air inlet is provided on the side of the piston facing the syringe, and the one-way emptying component and the air inlet are interconnected to allow the bubbles to be discharged in one direction.

[0007] Furthermore, an opening is provided at the bottom end of the syringe, and a medicine bottle is connected below the opening.

[0008] Furthermore, a sealing ring is arranged on the side wall of the piston, and the sealing ring is made of silicone or rubber.

[0009] Furthermore, the bottom end of the syringe is configured to be conical, and the side of the piston facing the syringe is adapted to the conical surface of the syringe.

[0010] Furthermore, the interior of the push rod is configured to be hollow, and the diameter of the top end of the push rod is larger than the diameter of the syringe.

[0011] Furthermore, the top end of the emptying pipe is connected to a medicine bag.

[0012] Furthermore, the one-way emptying assembly includes a one-way valve plug fixedly connected to the bottom end of the emptying pipe, the one-way valve plug is located inside the piston, and the bottom end of the one-way valve plug is fixedly connected to a ball core seat, a ball valve core is arranged inside the ball core seat, and the ball core seat and the air inlet are interconnected.

[0013] Furthermore, the bottom opening diameter of the one-way valve plug is smaller than the diameter of the ball valve core.

[0014] Furthermore, the ball core seat is configured to be hollow, with openings at the top and bottom of the ball core seat, the inner diameter of the top and middle positions of the ball core seat is equal to the diameter of the ball valve core, and the diameter of the bottom position of the ball core seat is smaller than the diameter of the ball valve core.

[0015] The present invention has at least the following beneficial effects:

[0016] The present invention can empty bubbles upward when the syringe is facing downward through the cooperation of the one-way valve plug, ball core seat, ball valve core, emptying pipe and other structures, and can be applied to intelligent high-pressure injection systems, which solves the problem that the traditional syringe-piston combination must point the syringe upward to push the piston to achieve upward emptying during emptying. It can be combined with other automated structures to complete the intelligent injection process, improve work efficiency, and simplify the emptying steps.

[0017] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a cross-sectional schematic diagram of the overall structure of the present invention;

[0019] Figure 2 For the present invention Figure 1 A magnified view of the structure at center A;

[0020] Figure 3 It is a schematic diagram of the structure of the present invention in the injection state.

[0021] Reference numerals:

[0022] 1. Syringe; 2. Piston; 3. Push rod; 4. Drain pipe; 5. One-way drain assembly; 51. One-way valve plug; 52. Ball core seat; 53. Ball valve core; 6. Air inlet; 7. Medicine bottle; 8. Sealing ring; 9. Medicine bag. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present disclosure to clearly and completely describe the technical solutions in the embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, rather than all the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0024] See also Figure 1-Figure 3 The present invention provides a technical solution: a bubble evacuation mechanism for an automatic drug aspiration syringe, which is applied to contrast agent injection, comprises a syringe 1, a piston 2 is coaxially arranged inside the syringe 1, the piston 2 is slidably connected to the syringe 1, a push rod 3 is fixedly connected to the top of the piston 2, and the outer diameter of the push rod 3 is equal to the inner diameter of the syringe 1;

[0025] The side of the piston 2 away from the syringe 1 is fixedly connected with an emptying pipe 4, the emptying pipe 4 is located inside the push rod 3, and the bottom end of the emptying pipe 4 is connected with a one-way emptying component 5, which is installed inside the piston 2 and is connected to the emptying pipe 4;

[0026] An air inlet 6 is provided on the side of the piston 2 facing the syringe 1 , and the one-way emptying component 5 and the air inlet 6 are interconnected to allow the bubbles to be discharged in one direction.

[0027] According to the technical solution of this embodiment, an opening is provided at the bottom end of the syringe 1, and a medicine bottle 7 is connected below the opening. The medicine bottle 7 is mainly used to store contrast agent.

[0028] With respect to the technical solution of this embodiment, a sealing ring 8 is provided on the side wall of the piston 2. The sealing ring 8 is used to enhance the sealing performance between the piston 2 and the syringe 1 to prevent the liquid medicine from leaking from the gap between the piston 2 and the syringe 1 when the piston 2 moves. In some embodiments, the sealing ring 8 can be made of silicone or rubber, which is not specifically limited in this embodiment and can be selected according to actual conditions.

[0029] According to the technical solution of this embodiment, the bottom end of the syringe 1 is configured to be conical, and the side of the piston 2 facing the syringe 1 is matched with the conical surface of the syringe 1. The conical surface design can not only increase the resistance during the injection process, thereby reducing the inertial force generated by the piston 2 when pushing the drug, thereby improving the stability and accuracy of the injection, but also reduce the rate of liquid reflux during the injection process, thereby reducing the occurrence of backflow.

[0030] According to the technical solution of this embodiment, the interior of the push rod 3 is set to be hollow, and the diameter of the top position of the push rod 3 is larger than the diameter of the syringe 1. When the push rod 3 drives the piston 2 to the bottom end of the syringe 1, the top end of the push rod 3 will be attached to the upper port of the syringe 1, which is convenient for closing the syringe 1.

[0031] Furthermore, a medicine bag 9 is connected to the top of the drain pipe 4. The medicine bag 9 is used to collect the discharged bubbles and part of the medicine liquid. It should be noted that the upper part of the drain pipe 4 is bent, so the discharged medicine liquid and bubbles will not flow back due to gravity.

[0032] According to the technical solution of this embodiment, the one-way emptying assembly 5 includes a one-way valve plug 51 fixedly connected to the bottom end of the emptying pipe 4. The one-way valve plug 51 is located inside the piston 2, and the bottom end of the one-way valve plug 51 is fixedly connected to a ball core seat 52. A ball valve core 53 is arranged inside the ball core seat 52. The ball core seat 52 mainly provides support and guidance for the ball valve core 53, and the ball core seat 52 and the air inlet 6 are interconnected, which facilitates the air bubbles to enter the ball core seat 52 from the air inlet 6 and enter the emptying pipe 4 through the ball core seat 52.

[0033] It should be noted that the bottom opening diameter of the one-way valve plug 51 is smaller than the diameter of the ball valve core 53. When the piston 2 moves downward rapidly, causing the ball valve core 53 to be squeezed and move upward, the ball valve core 53 will press against the bottom opening of the one-way valve plug 51, thereby facilitating the closing of the one-way valve plug 51 and preventing the evacuated bubbles and liquid medicine from flowing back.

[0034] Furthermore, the ball core seat 52 is configured to be hollow, and openings are provided at the top and bottom of the ball core seat 52. The inner diameters of the top and middle positions of the ball core seat 52 are slightly larger than the diameter of the ball valve core 53, and the diameter of the bottom position of the ball core seat 52 is smaller than the diameter of the ball valve core 53. When the syringe needs to draw medicine, pulling the push rod 3 drives the piston 2 to move upward, which will cause negative pressure to be generated in the syringe 1, and the medicine liquid is sucked from the medicine bottle 7 into the syringe 1. At this time, due to the effects of negative pressure and gravity, the ball valve core 53 will abut against the bottom of the ball core seat 52 downward to close the ball core seat 52. After the medicine drawing is completed, the piston 2 is slowly pushed downward to move. At this time, the ball valve core 53 will slowly move upward but will not The one-way valve plug 51 is closed, and then the bubbles in the syringe 1 enter the ball core seat 52 through the air inlet 6. Since the inner diameter of the top and middle positions of the ball core seat 52 is slightly larger than the diameter of the ball valve core 53, the bubbles and part of the medicine liquid will pass through the gap into the one-way valve plug 51, and then enter the medicine bag 9 through the emptying pipe 4. Due to the one-way permeability of the one-way valve plug 51, the gas entering the emptying pipe 4 will not return to the syringe 1, so upward emptying is achieved, which solves the problem that the traditional syringe 1 piston 2 combination must let the syringe 1 upward to push the piston 2 to achieve upward emptying during emptying. It can be combined with other automated structures to complete the intelligent injection process.

[0035] Furthermore, the ball valve core 53 is set as a steel ball, and the bottom openings of the one-way valve plug 51 and the bottom openings of the ball core seat 52 are both set as arc surfaces that match the steel ball, so as to enhance the sealing strength between the steel ball and the one-way valve plug 51 or the ball core seat 52.

[0036] The use principle and process of the present invention are as follows: when it is necessary to absorb the liquid medicine, the push rod 3 is pulled to drive the piston 2 to move upward, which will generate negative pressure in the syringe 1 and absorb the liquid medicine from the medicine bottle 7 into the syringe 1. At this time, due to the effect of negative pressure and gravity, the ball valve core 53 will abut against the bottom of the ball core seat 52 downward to close the ball core seat 52, so that the piston 2 can be in a closed state as a whole to avoid destroying the negative pressure state. When the bubbles need to be discharged after the absorption of the medicine is completed, the piston 2 is first slowly pushed downward to move. At this time, the ball valve core 53 will slowly move upward but will not close the one-way valve plug 51, and then the bubbles in the syringe 1 will enter the ball core seat 52 through the air inlet 6. Since the inner diameter of the top and middle positions of the ball core seat 52 is slightly larger than the diameter of the ball valve core 53, the bubbles and part of the liquid medicine will pass through the gap into the one-way valve plug 51, and then enter the medicine bag 9 through the emptying pipe 4. Due to the one-way permeability of the one-way valve plug 51, the gas entering the emptying pipe 4 will not return to the syringe 1.

[0037] When an injection is required, the push rod 3 is pushed quickly to drive the piston 2 to move downward quickly to squeeze the medicine in the syringe 1. At this time, due to the reaction force provided by the medicine, the ball valve core 53 will be squeezed upward, so that the ball valve core 53 moves upward along the ball core seat 52 until it is tightly fitted in the bottom opening of the one-way valve plug 51, which can ensure that the gas in the medicine bag 9 will not enter the syringe 1 and affect the safety of the injection syringe 1 during injection. Since the emptying has been completed at this time, there will be no excess bubbles in the injection syringe 1.

[0038] To sum up, according to the technical solution of this embodiment, during the entire process of drug aspiration and injection, the syringe 1 is always oriented downward, and upward emptying can be achieved without changing the orientation of the syringe 1. The above solution can be applied to an intelligent high-pressure injection system, which solves the problem that the traditional syringe 1-piston 2 combination must move the syringe 1 upward to push the piston 2 to achieve upward emptying during emptying. It can be combined with other automated structures to complete the intelligent injection process.

[0039] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0040] For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances. When an element is referred to as being "assembled on", "installed on", "fixed on" or "set on" another element, it can be directly on the other element or there can also be a centered element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be a centered element at the same time. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are only for illustrative purposes and are not intended to be the only implementation method.

[0041] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

[0042] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present disclosure. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

Claims

1. A bubble evacuation mechanism for an automatic syringe aspiration needle, used for contrast agent injection, comprising a syringe (1), wherein a piston (2) is coaxially arranged inside the syringe (1), and the piston (2) is slidably connected to the syringe (1), characterized in that: A push rod (3) is fixedly connected to the top of the piston (2), and the outer diameter of the push rod (3) is equal to the inner diameter of the syringe (1); A drain pipe (4) is fixedly connected to the side of the piston (2) away from the syringe (1), the drain pipe (4) is located inside the push rod (3), and a one-way drain assembly (5) is connected to the bottom end of the drain pipe (4), the one-way drain assembly (5) is installed inside the piston (2) and is in communication with the drain pipe (4); An air inlet (6) is provided on the side of the piston (2) facing the syringe (1), and the one-way emptying component (5) and the air inlet (6) are interconnected to allow air bubbles to be discharged in one direction.

2. The bubble exhaust mechanism for the automatic drug aspiration syringe of claim 1, characterized in that: The bottom end of the syringe (1) is provided with an opening, and a medicine bottle (7) is connected below the opening.

3. The bubble evacuation mechanism for the automatic drug aspiration syringe of claim 2, characterized in that: A sealing ring (8) is arranged on the side wall of the piston (2), and the sealing ring (8) is made of silica gel or rubber.

4. The bubble evacuation mechanism for the automatic drug aspiration syringe of claim 2, characterized in that: The bottom end of the syringe (1) is arranged in a conical shape, and the side of the piston (2) facing the syringe (1) is adapted to the conical surface of the syringe (1).

5. The bubble evacuation mechanism for the automatic drug aspiration syringe of claim 4, characterized in that: The interior of the push rod (3) is arranged to be hollow, and the diameter at the top end of the push rod (3) is larger than the diameter of the syringe (1).

6. The bubble evacuation mechanism for the automatic drug aspiration syringe of claim 5, characterized in that: The top end of the emptying pipe (4) is connected to a medicine bag (9).

7. The bubble exhaust mechanism for the automatic drug aspiration syringe of claim 6, characterized in that: The one-way emptying assembly (5) comprises a one-way valve plug (51) fixedly connected to the bottom end of the emptying pipe (4), the one-way valve plug (51) being located inside the piston (2), and the bottom end of the one-way valve plug (51) being fixedly connected to a ball core seat (52), a ball valve core (53) being arranged inside the ball core seat (52), and the ball core seat (52) and the air inlet (6) being interconnected.

8. The bubble evacuation mechanism for the automatic drug aspiration syringe of claim 7, characterized in that: The bottom opening diameter of the one-way valve plug (51) is smaller than the diameter of the ball valve core (53).

9. The bubble evacuation mechanism for the automatic drug aspiration syringe of claim 7, characterized in that: The ball core seat (52) is configured to be hollow, and openings are provided at the top and bottom of the ball core seat (52). The diameter of the bottom position of the ball core seat (52) is smaller than the diameter of the ball valve core (53).

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