Self-exhaust injection core rod and ring handle injector

Abstract

The utility model relates to a self-exhaust injection core rod and a ring handle injector, the self-exhaust injection core rod is installed in an injector cylinder and comprises an end head extending into the injector cylinder, the end head comprises an exhaust channel, an I-shaped valve is arranged on the exhaust channel and comprises a valve column contained in the exhaust channel, and the valve column is provided with an air inlet and an air outlet. The valve blocks are located on the two sides of the exhaust channel, and the I-shaped valve can be movably embedded in the exhaust channel in a side-swaying mode. According to the utility model, the core rod is drawn to enable a contrast agent or liquid medicine to enter the syringe cylinder, the ring handle syringe does not need to be inverted for manual exhaust, the core rod can be directly pushed to enable the liquid medicine or the contrast agent to enter a blood vessel, and the gas can be automatically exhausted from the syringe cylinder through the core rod.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medical devices, in particular to a self-venting injection core rod and a ring handle syringe. BACKGROUND

[0002] The ring handle syringe is suitable for injecting contrast medium and liquid medicine in minimally invasive interventional therapy or diagnostic surgery. It generally comprises a syringe barrel, a piston, a core rod, a knob, and an outer conical joint. The piston is installed at the front of the core rod and can be driven by the core rod to move back and forth in the syringe barrel. The front end of the syringe barrel is provided with an outer conical joint for connecting a needle joint or other connecting tubes.

[0003] In the use of the existing ring handle syringe, the contrast medium and liquid medicine are sucked into the syringe barrel. The ring handle syringe needs to be inverted, and the outer surface of the sleeve is vibrated to make the air bubbles rise to the upper end. Manual venting is performed.

[0004] During the venting process, excessive pushing of the core rod by hand can easily cause inaccurate injection of the contrast medium or liquid medicine. Moreover, the inverted manual venting process is inconvenient for medical personnel and can easily cause incomplete air bubble removal or forget to vent, etc. When air enters the blood circulation system, air embolism can easily occur, which can be fatal. CONTENT OF THE INVENTION

[0005] The purpose of the present application is to provide a self-venting injection core rod and a ring handle syringe. The core rod is moved to make the contrast medium or liquid medicine enter the syringe barrel. Manual venting is not required for the inverted ring handle syringe. The core rod can be directly pushed to make the liquid medicine or contrast medium enter the blood vessel, and the air can be automatically discharged from the syringe barrel through the core rod.

[0006] To achieve the above-mentioned purpose, in a first aspect, the utility model provides a self-venting injection core rod which is installed in a syringe barrel and comprises a tip end extending into the syringe barrel. The tip end comprises an air venting channel. A I-shaped valve is arranged on the air venting channel. The I-shaped valve comprises a valve column accommodated in the air venting channel and valve blocks located on both sides of the air venting channel. The I-shaped valve is movably embedded on the air venting channel in a side swing manner.

[0007] In an optional embodiment, the valve column and the valve blocks are of an integrated structure. The air venting channel comprises a circular straight-through hole. The contour size of the valve blocks is greater than the diameter of the air venting channel, and the diameter of the valve column is less than the diameter of the air venting channel.

[0008] In an optional embodiment, the length of the valve column is at least greater than the length of the air venting channel. The valve blocks located on both sides are each provided with a valve block matching surface for opening and closing the air venting channel in a side swing manner. The valve block matching surfaces are oppositely arranged on both sides of the valve column.

[0009] In an optional embodiment, both sides of the exhaust passage are provided with end head matching surfaces, which are arranged on the radial outer side of the exhaust passage and correspond to the valve block matching surfaces respectively.

[0010] In an optional embodiment, the end head matching surface comprises an end head plane, and the valve block matching surface comprises a valve block plane capable of being fitted with the end head plane.

[0011] In an optional embodiment, the end head matching surface comprises an end head arc surface, and the valve block matching surface comprises a valve block arc surface capable of being linearly tangent to the end head arc surface, and the radius of the circular arc of the end head arc surface is the same as the radius of the circular arc of the valve block arc surface.

[0012] In an optional embodiment, the I-shaped valve has a material density less than the density of the suction liquid, or the I-shaped valve is a hollow structure as a whole.

[0013] In an optional embodiment, a core rod cavity in communication with the outside atmosphere is further included, and the exhaust passage is in communication with the core rod cavity.

[0014] In a second aspect, the utility model further provides a ring handle syringe, including syringe barrel, press hand and the self exhaust injection core rod of any one of preceding embodiment, the press hand is connected in the outer end of the core rod, and the core rod is inserted in the syringe barrel telescopically.

[0015] In an optional embodiment, a sealing washer is arranged between the syringe barrel and the core rod, and an annular groove is arranged on the side wall of the core rod, and the sealing washer is fixedly installed in the annular groove.

[0016] By arranging the exhaust passage on the end head of the core rod inserted into the syringe barrel, and arranging the I-shaped valve movably in the exhaust passage, under the action of the suction force, the I-shaped valve can move laterally to form a gap between the I-shaped valve and the exhaust passage, which is beneficial to automatically exhaust the gas in the suction liquid.

[0017] When the liquid is suctioned, the end head of the core rod moves outward, and in combination with the sealing state between the end head and the syringe barrel, a negative pressure is formed to make the liquid enter the closed chamber between the gradually retreating end head and the head end of the syringe barrel, and due to the generated vacuum negative pressure, the suction liquid is pressed into the above-mentioned closed chamber under the action of the external air pressure and maintains the tendency of pressure filling compression during the pulling of the core rod, so that the I-shaped valve swings towards the pulling direction of the core rod and further opens the exhaust passage, and under the action of the pressure filling compression of the suction liquid in the form of compression, the gas gathered in the end head part of the core rod is pushed out, thereby realizing the self exhaust function of the injection core rod.

[0018] The I-shaped valve comprises a valve column accommodated in the exhaust passage and further movably accommodated in the exhaust passage to provide conditions for lateral swing movement of the I-shaped valve, and valve blocks located on both sides of the exhaust passage and connected to both ends of the valve column respectively, which can swing towards the moving direction of the core rod during liquid suction and abut against the head end of the core rod on the other side of the core rod under the action of liquid filling after the completion of suction and during the injection of liquid to complete the sealing of the exhaust passage.

[0019] Through the cooperation between the I-shaped valve and the exhaust passage in the present application, the self-exhaust function of the injection core rod can be realized to reduce the mixing of air in the injection of liquid.

[0020] Other features and advantages of the present application will be described in detail in the following specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0022] Figure 1 Structure diagram of the self-exhaust injection core rod in the present application;

[0023] Figure 2 Structure diagram of the cooperation between the I-shaped valve and the exhaust passage in one of the setting forms;

[0024] Figure 3 Structure diagram of the cooperation between the I-shaped valve and the exhaust passage in another setting form;

[0025] Figure 4 Structure diagram of the state of the head end of the core rod during liquid suction;

[0026] Figure 5 Structure diagram of the state of the head end of the core rod during liquid injection;

[0027] Figure 6 Structure diagram of the overall structure of the ring handle syringe.

[0028] FIGURE:

[0029] 1-core rod; 11-end head; 11a-end head matching surface; 12-exhaust passage; 13-core rod cavity; 14-connection hole; 15-annular groove;

[0030] 2-I-shaped valve; 21-valve column; 22-valve block; 22a-valve block matching surface;

[0031] 3-syringe barrel;

[0032] 4-press the hand;

[0033] 5-sealing washer. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme of 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 part of the embodiments of the present application, not all the embodiments. The components of the embodiments of the present application described and shown in the drawings can be arranged and designed in various different configurations.

[0035] In the description of the present application, it should be noted that the positions or location relationships indicated by the terms "inner", "outer" and the like are based on the positions or location relationships shown in the drawings, or the positions or location relationships commonly placed when the products of the present application are used, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second" and the like are only used for differentiation in description, and cannot be understood as indicating or implying relative importance.

[0036] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "set", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium, or it can be connected inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0037] The self-bleeding injection core rod in the present application is mainly used for automatic bleeding when the syringe pumps liquid, and plugging the liquid-filled closed chamber after the liquid pumping is completed and when the liquid is pushed. From the function of self-bleeding, the manual bleeding operation is reduced, and the pumping and pushing are specifically limited to the vertical or vertical inclined state of the syringe.

[0038] Referring to Figure 1 The self-bleeding injection core rod in the present application is installed in the syringe barrel 3, and the main body structure includes the rod body itself and the end head 11 extending into the syringe barrel 3. The rod body of the core rod 1 is a hollow structure, and the central part of the end head 11 is provided with an exhaust passage 12, which is communicated with the core rod cavity 13 of the core rod 1.

[0039] During the process of sucking liquid, the air in the liquid can automatically float to the end head 11 of the core rod 1 in the vertical state, and be discharged from the liquid-tight chamber between the end head 11 of the core rod 1 and the front end of the syringe barrel 3 to the hollow rod cavity of the core rod 1 communicated with the exhaust passage 12 under the cooperation of the I-shaped valve 2 and the exhaust passage 12, to realize the overall exhaust process.

[0040] The I-shaped valve 2 is arranged on the exhaust passage 12 and includes a valve column 21 movably arranged in the exhaust passage 12 and valve blocks 22 located on both sides of the exhaust passage 12 and connected with both ends of the valve column 21. Through the valve column 21 and the valve blocks 22, the I-shaped valve 2 can produce side swing movement during the processes of sucking liquid and injecting liquid, so as to respectively open the exhaust passage 12 from the lower side of the exhaust passage 12 when sucking liquid or seal the exhaust passage 12 from the lower side of the exhaust passage 12 when injecting liquid, so that the I-shaped valve 2 can swingly and movably be embedded on the exhaust passage 12 to realize normal sucking liquid and injecting liquid.

[0041] In combination Figures 4-5 , the cooperation between the I-shaped valve 2 and the exhaust passage 12 is described in detail in two different operations of sucking liquid and injecting liquid.

[0042] When sucking liquid, the syringe is vertically downward, the I-shaped valve 2 naturally droops, the upper valve blocks 22 of the I-shaped valve 2 naturally seal the upper side of the exhaust passage 12, and when pulling the core rod 1, the liquid enters the chamber between the continuously retreating core rod 1 and the bottom end of the syringe barrel 3 based on the formed negative pressure vacuum, and the gas is discharged to the chamber. After the chamber, on the one hand, the gas bubbles are naturally floated and gathered at the end head 11, and on the other hand, based on the above-mentioned state of the sucked liquid being filled and injected into the chamber in the form of compression, the I-shaped valve 2 is continuously lifted, so that the I-shaped valve 2 produces a lifting movement state. Since the core rod 1 is continuously retreating, the sucked liquid will maintain the compression tendency of filling and injecting during the sucking process, the gas at the top is pushed out of the liquid filling and injecting chamber through the gap cooperation between the I-shaped valve 2 and the exhaust passage 12, until the liquid fills the entire closed chamber, and the I-shaped valve 2 floats on the top of the closed chamber due to the fact that the material density of the I-shaped valve 2 is less than the density of the liquid. The lower valve blocks 22 of the I-shaped valve 2 seal the lower side of the exhaust passage 12, to realize the self-exhaust process during the sucking liquid.

[0043] When injecting liquid, due to the floating of the I-shaped valve 2 at the top of the liquid and the full state of the above-mentioned closed chamber, the I-shaped valve 2 can maintain the top sealing state of the exhaust passage 12 during the injection of the core rod 1, until the injection is completed.

[0044] In one specific embodiment, the valve stem 21 and the valve block 22 are integrated, and can move as a whole to the side of the exhaust passage 12. The exhaust passage 12 includes a circular straight passage arranged at the head end of the core rod 1, and the valve block 22 has a size larger than the diameter of the exhaust passage 12, so as to block the exhaust passage 12 during the side movement. In order to ensure that the valve stem 21 can move in the exhaust passage 12, the diameter of the valve stem 21 is smaller than the diameter of the exhaust passage 12, so as to provide conditions for the side movement of the I-shaped valve 2.

[0045] Further, the length of the valve stem 21 is at least greater than the length of the exhaust passage 12, preferably slightly greater than the length of the exhaust passage 12, and both ends of the valve stem 21 can extend from both side ports of the exhaust passage 12, so as to form a connection space between the valve block 22 and the valve stem 21, and facilitate the generation of an exhaust gap between the valve block 22 and the exhaust passage 12 during the side movement of the I-shaped valve 2.

[0046] Both of the valve blocks 22 arranged at both sides are provided with a valve block matching surface 22a, which can be attached to or separated from the wall surface where the exhaust passage 12 is arranged, so as to open or close the exhaust passage 12. The valve block matching surfaces 22a on both valve blocks 22 are arranged at both sides of the valve stem 21.

[0047] From the opening and closing matching angle between the valve block 22 and the exhaust passage 12 of the I-shaped valve 2, both sides of the exhaust passage 12 are provided with an end matching surface 11a. The end matching surface 11a is arranged at both sides of the wall surface where the exhaust passage 12 is arranged, and further, the end matching surface 11a is arranged at the radial outer side of the exhaust passage 12, and is arranged corresponding to the valve block matching surface 22a on both valve blocks 22.

[0048] During the different processes of sucking liquid and injecting liquid, the valve block matching surface 22a can be matched with the end matching surface 11a by the side movement of the I-shaped valve 2, so as to open or close the exhaust passage 12.

[0049] It should be noted that the size of the valve block 22 is larger than the diameter of the exhaust passage 12, and further, the size of the valve block matching surface 22a is larger than the diameter of the exhaust passage 12, so as to ensure that the valve block matching surface 22a can block the exhaust passage 12 during the side movement of the I-shaped valve 2.

[0050] Referring to Figure 2 In one arrangement, the end matching surface 11a includes an end 11 plane, and the valve block matching surface 22a includes a valve block 22 plane which can be attached to the end 11 plane. In this arrangement, the syringe needs to be in a reliable vertical state during use, so that the valve block 22 plane can be attached to or separated from the end 11 plane, so as to open or close the exhaust passage 12 of the I-shaped valve 2.

[0051] Referring toFigure 3 In another arrangement, the end head matching surface 11a comprises an end head arc surface, the valve block matching surface 22a comprises a valve block arc surface capable of linear tangency with the end head arc surface, and the radius of the circular arc of the end head arc surface is the same as that of the valve block arc surface.

[0052] In this arrangement, the syringe does not need to be used in a completely vertical state, and when it is tilted, the exhaust passage 12 can be sealed by the linear tangency of the end head arc surface and the valve block arc surface, and the valve block 22 can still be tightly matched with the exhaust passage 12 to prevent liquid leakage.

[0053] Based on the matching angle of the I-shaped valve 2 and the exhaust passage 12, the I-shaped valve 2 is required to float on the top of the suction liquid, and thus the material density of the I-shaped valve 2 needs to be less than that of the suction liquid, and high-molecular materials such as polypropylene and polyethylene can be used.

[0054] Meanwhile, in order to achieve the floating effect, the I-shaped valve 2 can also be arranged in a hollow structure as a whole, and the I-shaped valve 2 can normally float on the top surface of the suction liquid.

[0055] After the air is discharged, it enters the core rod cavity 13 which is in communication with the exhaust passage 12, the core rod cavity 13 is in communication with the atmosphere and is isolated from the suction sealed chamber as described above, and a certain air pressure balance is maintained.

[0056] It is particularly pointed out that, when the liquid is sucked, the negative pressure vacuum in the suction sealed chamber is formed, the pressurized liquid is kept in a pressurized state, the pressurization trend of the pressurized liquid and the pressurization force are sufficient to overcome the force of the air on the side of the core rod cavity 13 entering the sealed chamber, so as to ensure the effective and reliable exhaust during the suction of the liquid.

[0057] Referring to Figure 6 The utility model also provides a ring handle syringe, including syringe barrel 3, press hand 4 and above-mentioned self exhaust injection core rod, press hand 4 is connected at the outer end of core rod 1, is provided with connecting hole 14 on core rod 1, press hand 4 is installed at the outer end of core rod 1 through connecting hole 14, and core rod cavity 13 is communicated with the outside environment through connecting hole 14.

[0058] The core rod 1 is telescopically inserted into the syringe barrel 3, a sealing gasket 5 is arranged between the syringe barrel 3 and the core rod 1, an annular groove 15 is arranged on the side wall of the core rod 1, and the sealing gasket 5 is fixedly installed in the annular groove 15. Further, the sealing gasket 5 is arranged on the back side of the end head 11 of the core rod 1, which can ensure the airtightness of the sealed chamber between the end head 11 of the core rod 1 and the head end of the syringe barrel 3, and form an effective and reliable vacuum negative pressure when the liquid is sucked.

[0059] The ring handle syringe of the utility model reduces the manual exhaust of medical staff and enhances the safety when injecting contrast medium or liquid medicine.

[0060] It should be noted that the features of the embodiments in the present application can be combined with each other without conflict.

[0061] The above only is the preferred embodiment of the present application, and is not used to limit the present application, and for the person skilled in the art, the present application can have various changes and changes. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A self-venting injection core rod mounted in an injector barrel, characterized in that, The end head extends into the syringe barrel and includes an exhaust passage with a valve arranged thereon, the valve including a valve stem received in the exhaust passage and valve blocks on both sides of the exhaust passage, the valve being swingably embedded on the exhaust passage.

2. The self-venting core pin of claim 1, wherein, The valve stem and the valve blocks are integrated, the exhaust passage includes a circular through hole, the valve blocks have a larger profile size than the diameter of the exhaust passage, and the valve stem has a smaller diameter than the exhaust passage.

3. The self-venting core pin of claim 1, wherein, The valve stem has a length greater than the length of the exhaust passage, and the valve blocks on both sides are provided with valve block mating surfaces for enabling opening and closing of the exhaust passage in swing, the valve block mating surfaces being oppositely arranged on both sides of the valve stem.

4. The self-venting core pin of claim 3, wherein, The exhaust passage is provided with end head mating surfaces on both sides, the end head mating surfaces being arranged on the radial outside of the exhaust passage and correspondingly arranged with the valve block mating surfaces.

5. The self-venting core pin of claim 4, wherein, The end head mating surfaces include end head flat surfaces, and the valve block mating surfaces include valve block flat surfaces capable of being fitted with the end head flat surfaces.

6. The self-venting core pin of claim 4, wherein, The end head mating surfaces include end head arc surfaces, and the valve block mating surfaces include valve block arc surfaces capable of being linearly tangent to the end head arc surfaces, the end head arc surfaces having the same radius of curvature as the valve block arc surfaces.

7. The self-venting core pin of any of claims 1-6, wherein, The valve has a material density less than the density of the suction liquid, or the valve is a hollow structure.

8. The self-venting core pin of any of claims 1-6, wherein, A core rod cavity is further provided for communicating with the atmosphere, and the exhaust passage communicates with the core rod cavity.

9. A loop handle syringe characterized by, The syringe barrel, a press hand, and the self-exhausting injection core rod of any one of claims 1-8 are provided, the press hand being connected to the outer end of the core rod, and the core rod being telescopically inserted into the syringe barrel.

10. The loop handle syringe of claim 9, wherein, A sealing washer is arranged between the syringe barrel and the core rod, and an annular groove is arranged on the side wall of the core rod, the sealing washer being fixedly installed in the annular groove.

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