Self-exhausting syringe with ring handle

Abstract

The utility model relates to a self-exhaust ring handle injector which comprises a core rod and an injector barrel, a piston is installed at the end, extending into the injector barrel, of the core rod, a vent hole is formed in the piston, a floating plug is movably embedded between the end and the piston, and a valve is arranged on the floating plug. And an exhaust channel which can be opened and closed under the movable fit of the floating plug is arranged on the end head. When the core rod is drawn to enable contrast agents or liquid medicine to enter the syringe barrel, air can be automatically exhausted from the position of the piston, the ring handle syringe does not need to be inverted for manual exhaust, and the core rod can be directly pushed to enable the liquid medicine or contrast liquid to enter blood vessels through a liquid outlet or an extension tube and other matched instruments.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medical devices, in particular to a self-venting 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 the piston 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 syringe 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, and 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, and 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, and the venting operation after the outer conical joint position sucks the liquid medicine can easily cause incomplete venting. 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.

[0005] At the same time, the existing syringe with automatic venting function increases a vent hole at the position of the piston, and a one-way valve, a breathable film or other structures are installed at the position of the vent hole. The structure is more complex, and can easily cause excessive discharge of the contrast medium or liquid medicine, which is inconvenient for observation and can cause inaccurate injection. CONTENT OF THE INVENTION

[0006] The purpose of the present application is to provide a self-venting ring handle syringe with simple structure and convenient operation. When the core rod is moved to make the contrast medium or liquid medicine enter the syringe barrel, air can be automatically discharged from the position of the piston. The ring handle syringe does not need to be inverted for manual venting, and the core rod can be directly pushed to make the liquid medicine or contrast medium enter the blood vessel through the liquid outlet or a lengthening tube and other cooperating instruments.

[0007] In order to achieve the above purpose, the utility model provides a self-venting ring handle syringe, which comprises a core rod and a syringe barrel. A piston is installed on the end of the core rod that extends into the syringe barrel. A vent hole is provided on the piston. A floating plug is movably embedded between the end and the piston. An air vent is provided on the end and can be opened and closed under the movable cooperation of the floating plug.

[0008] In an optional embodiment, the floating plug comprises a mounting column and a conical platform in an integral structure, the end head comprises a receiving slot, the floating plug is limitedly installed in the receiving slot through the mounting column, the core rod comprises a core rod cavity in communication with the outside, and the exhaust passage is arranged on the slot wall between the receiving slot and the core rod cavity.

[0009] In an optional embodiment, the receiving slot comprises an open slot, the mounting column extends out of the open slot and has a length greater than that of the receiving slot, and the conical platform is arranged outside the open slot and has a conical surface oppositely directed to the piston.

[0010] In an optional embodiment, the head end of the piston comprises an inner side wall in a conical structure, the conical angle of the conical platform is the same as that of the inner side wall, so that the conical platform can be fitted with the inner side wall, and the vent holes are arranged through the head end of the piston and comprise a plurality of vent holes uniformly distributed in the circumferential direction of the piston.

[0011] The conical platform comprises an outer edge extending radially from the mounting column, and the profile edge of the outer edge extends radially beyond the opening position of the vent holes on the inner side wall.

[0012] In an optional embodiment, the vent holes are arranged obliquely on the head end of the piston and gradually taper from the outside to the inside in the radial direction of the piston, and a plurality of the vent holes are distributed on the head end of the piston in a diverging manner.

[0013] In an optional embodiment, the receiving slot comprises a cylindrical structure, the diameter of the mounting column is smaller than that of the receiving slot, the exhaust passage comprises a circular through hole, and the diameter of the through hole is smaller than that of the mounting column, and the exhaust passage is arranged concentrically with the receiving slot.

[0014] In an optional embodiment, the piston further comprises a clamping sleeve, the end head further comprises a mounting ring groove, the mounting ring groove is arranged radially outside the receiving slot, and the clamping sleeve extends radially into the mounting ring groove and is clamped on the groove wall of the mounting ring groove.

[0015] In an optional embodiment, the material density of the floating plug is smaller than that of the liquid sucked by the syringe, or the floating plug is in an integral hollow structure.

[0016] In an optional embodiment, the syringe barrel is provided with a liquid inlet and a liquid outlet, the liquid inlet is arranged at the end of the syringe barrel, and the liquid outlet is arranged on the side wall of the syringe barrel and is arranged immediately adjacent to the liquid inlet.

[0017] In an alternative embodiment, a sealing cap is further included, which is reversibly used between the liquid inlet and the liquid outlet. When the syringe is used for sucking liquid, the sealing cap is capped on the liquid outlet. When the syringe is used for injecting liquid, the sealing cap is capped on the liquid inlet.

[0018] By setting the exhaust passage on the end of the core rod extending into the syringe barrel, and setting the floating plug movably embedded between the end and the piston, under the action of the suction force and in combination with the air mixed in the sucked liquid, the floating plug can move laterally between the end of the core rod and the piston, so that the air in the sucked liquid enters the gap between the floating plug and the piston through the vent hole on the piston, further passes through the movable avoidance of the floating plug to the exhaust passage, and finally automatically discharges the air in the sucked liquid. Under the internal top effect of the liquid filled between the end of the core rod and the end of the syringe barrel, the floating plug is laterally abutted against the exhaust passage to block the exhaust passage, which is beneficial to the injection of the sucked liquid.

[0019] When injecting liquid, the pressure in the syringe barrel is increased under the action of the injection force and the passive extrusion of the filled liquid, so that the floating plug is firmly abutted against the core rod to effectively block the exhaust passage, ensuring the reliable injection of the liquid and avoiding the injection pressure relief.

[0020] By movably embedding the floating plug between the end of the core rod and the piston, the floating plug can be movably matched with the exhaust passage to open and close the exhaust passage when sucking and injecting liquid, realizing the functions of self-exhaustion and reliable liquid injection.

[0021] Other features and advantages of the present application will be described in detail in the following specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be considered as limiting the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0023] Figure 1 is a sectional view of the core rod and the piston in the present application;

[0024] Figure 2 is an external structure diagram of the core rod and the piston in the present application;

[0025] Figure 3 is a side view of the distribution of the vent hole on the piston in the present application;

[0026] Figure 4Figure 1 is a schematic diagram of the overall structure of the self-venting ring handle syringe in the present application;

[0027] Figure 5 Figure 4 is a schematic diagram of the state of the sealing cap covering the liquid inlet in the present application.

[0028] Figure 1 is a schematic diagram of the overall structure of the self-venting ring handle syringe in the present application;

[0029] 1-rod; 11-end; 12-exhaust passage; 13-receiving groove; 14-rod cavity; 15-mounting ring groove;

[0030] 2-syringe barrel; 21-liquid inlet; 22-liquid outlet; 23-filter cotton;

[0031] 3-piston; 31-vent hole; 32-inner side wall; 33-clamping sleeve;

[0032] 4-floating plug; 41-mounting column; 42-conical table; 43-flared rim;

[0033] 5-sealing cap. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme of the embodiments of the present application will be described clearly and completely below in combination 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 position, be constructed and operated in a particular position, 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 "provided", "connected" should be understood broadly, for example, can be fixedly connected, can be detachably connected, or integrally connected; can be directly connected, or indirectly connected through an intermediate medium; 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 ring handle syringe in the application is mainly used for automatic bleeding when the syringe sucks liquid, and has the function of plugging the liquid-filled closed chamber after the liquid sucking is completed and when the liquid is injected, so as to reduce the manual bleeding operation from the function angle of self-bleeding, and is particularly limited to sucking and injection in the vertical or vertical inclined state of the syringe.

[0038] Referring to Figures 1-2 The self-bleeding ring handle syringe in the application comprises a plunger 1 and a syringe barrel 2, the plunger 1 is installed in the syringe barrel 2, a piston 3 is installed on the end head 11 of the plunger 1 extending into the syringe barrel 2, the plunger 1 is mainly sealed in the syringe barrel 2 through the piston 3, and a negative pressure vacuum is formed in the gap between the piston 3 and the end of the syringe barrel 2 when the plunger 1 is pulled back.

[0039] An air vent hole 31 is arranged on the piston 3, which is mainly used for allowing the gas in the sucked liquid to enter the inside space of the piston 3, a floating plug 4 is movably embedded between the end head 11 and the piston 3, the piston 3 is fixedly installed on the end head 11 of the plunger 1, and specifically comprises a hollow structure, the floating plug 4 can swing and move between the end head 11 and the piston 3. An exhaust passage 12 is arranged on the end head 11, and the exhaust passage 12 can be opened and closed under the active cooperation of the floating plug 4.

[0040] When the liquid is sucked, the air entering the inside space of the piston 3 can gather upward, the floating plug 4 swings downward under the action of the upward jumping of the air, the air is automatically discharged from the closed cavity between the piston 3 and the syringe barrel 2 by avoiding the exhaust passage 12 through the floating plug 4; when the liquid is injected, the liquid filled in the closed cavity between the piston 3 and the syringe barrel 2 can upwardly seal the floating plug 4, so as to force the floating plug 4 to upwardly seal the exhaust passage 12, thereby achieving the technical effects of self-bleeding of the sucked liquid and sealing of the exhaust passage 12 of the injected liquid.

[0041] The floating plug 4 comprises an integral structure of an installation column 41 and a conical table 42, a containing groove 13 is arranged on the end head 11 of the plunger 1, the floating plug 4 is limitingly installed in the containing groove 13 through the installation column 41, so that the floating plug 4 cannot be separated from the containing groove 13.

[0042] A plunger cavity 14 is arranged on the other side of the plunger 1 opposite to the piston 3, the plunger cavity 14 is communicated with the outside and the exhaust passage 12, so that the air can be discharged to the plunger cavity 14 through the exhaust passage 12, specifically, the exhaust passage 12 is arranged on the groove wall between the containing groove 13 and the plunger cavity 14, so that the air entering between the piston 3 and the end head 11 of the plunger 1 can be discharged to the plunger cavity 14 under the avoiding state of the floating plug 4 to the exhaust passage 12.

[0043] From the perspective of limiting installation of the floating plug 4, the accommodating groove 13 comprises an open structure of a slot, the mounting column 41 extends from the slot and its length is greater than the length of the accommodating groove 13, and it can swing between the end head 11 and the piston 3.

[0044] The conical frustum 42 is arranged outside the slot and its taper surface is opposite to the piston 3. The conical frustum 42 is arranged mainly to ensure that the liquid can be normally sucked. Specifically, when the liquid is sucked, the syringe is downward, and the floating plug 4 does not float under the action of the liquid because the liquid has not been filled. The floating plug 4 is integrally lowered by its own weight, the mounting column 41 avoids the exhaust passage 12, and the taper surface of the conical frustum 42 is in contact with the inner side wall 32 of the piston 3 to block the vent hole 31, so as to avoid that the exhaust passage 12 is opened and the suction vacuum cannot be effectively formed between the piston 3 and the end head of the syringe barrel 2.

[0045] With the pulling of the core rod 1, the liquid enters the sealed chamber between the piston 3 and the end head of the syringe barrel 2. If there is no air mixed in the liquid, combined with the vacuum negative pressure gradually formed in the sealed chamber, the external air pressure will overcome the buoyancy of the liquid applied to the floating plug 4, and the floating plug 4 will be firmly embedded on the inner side wall 32 of the piston 3 to block the vent hole 31 and maintain normal liquid suction operation.

[0046] Once air is mixed in, based on the fact that the density of air is less than the density of the sucked liquid, the air will float upward and push the floating plug 4 away, so that the air enters the gap between the piston 3 and the end head 11 of the core rod 1 through the vent hole 31 and is further automatically discharged into the core rod cavity 14 through the avoided opened exhaust passage 12.

[0047] In the state of air mixing, the self-discharge of air is a dynamic process, and the floating plug 4 will continuously swing upward during the discharge process without being limited by the installation in the accommodating groove 13. When the suction is completed, the floating plug 4 will move upward under the action of the buoyancy of the liquid, so that the sucked liquid fills the gap between the end head of the core rod 1 and the piston 3 through the vent hole 31, and the end surface of the mounting column 41 of the floating plug 4 blocks the exhaust passage 12, which is beneficial to subsequent sealed injection.

[0048] Based on the cooperation form of the piston 3 and the end head of the syringe barrel 2, the piston 3 comprises a conical structure at the front end, and the inner side wall 32 of the piston 3 at the front end comprises a conical structure. In order to enable the conical frustum 42 included in the floating plug 4 to be in contact with the inner side wall 32 of the piston 3, the taper angle of the conical frustum 42 on the floating plug 4 is the same as the taper angle of the inner side wall 32 of the piston 3, so as to enable the conical frustum 42 to be in contact with the inner side wall 32 to block the vent hole 31.

[0049] In combination with Figure 3In order to facilitate the air to pass through the piston 3, the air vent hole 31 is inclined to be arranged on the head end of the piston 3, and gradually narrows from the outside to the inside along the radial direction of the piston 3, so that the section of each air vent hole 31 is in the shape of an inverted trapezoid. Specifically, the opening of each air vent hole 31 on the outer side wall of the head end of the piston 3 is larger than the opening on the inner side wall 32 of the head end of the piston 3, and extends obliquely from the outside to the inside along the radial direction of the piston 3 towards the center of the piston 3. In combination with the fact that a plurality of air vent holes 31 are uniformly distributed on the circumference of the piston 3, the plurality of air vent holes 31 are distributed on the head end of the piston 3 in a scattered manner.

[0050] The conical platform 42 comprises an extended edge 43 which radially extends from the mounting column 41, and the profile edge of the extended edge 43 is radially beyond the opening position of the air vent hole 31 on the inner side wall 32, so as to block all the air vent holes 31 when the conical platform 42 is attached to the inner side wall 32 of the piston 3.

[0051] It should be noted that the extended edge 43 can be configured as a whole conical surface with the conical platform 42, so that the conical platform 42 is completely attached to the inner side wall 32 of the piston 3, or the extended edge 43 can be configured as a ring-shaped baffle structure outside the conical platform 42, so that the profile edge of the extended edge 43 is in linear contact with the inner side wall 32 of the conical structure of the piston 3 to isolate the air vent hole 31 channel, which is described herein.

[0052] In order to facilitate the air to pass through the piston 3, the air vent hole 31 is inclined to be arranged on the head end of the piston 3, and gradually narrows from the outside to the inside along the radial direction of the piston 3, so that the section of each air vent hole 31 is in the shape of an inverted trapezoid. Specifically, the opening of each air vent hole 31 on the outer side wall of the head end of the piston 3 is larger than the opening on the inner side wall 32 of the head end of the piston 3, and extends obliquely from the outside to the inside along the radial direction of the piston 3 towards the center of the piston 3. In combination with the fact that a plurality of air vent holes 31 are uniformly distributed on the circumference of the piston 3, the plurality of air vent holes 31 are distributed on the head end of the piston 3 in a scattered manner.

[0053] Through the above arrangement, the outer opening of the air vent hole 31 is located at the edge of the head end of the piston 3. In the initial stage of liquid suction, the liquid first contacts the conical surface of the outer side wall of the head end of the piston 3 and is not easy to flow inward from the outer opening of the air vent hole 31. In turn, a vacuum negative pressure condition can be created in the sealed chamber between the piston 3 and the head end of the syringe barrel 2, so as to avoid the instability of air pressure caused by the liquid entering the inside of the piston 3 through the air vent hole 31, and the liquid cannot be sucked.

[0054] The mounting column 41 and the conical platform 42 of the floating plug 4 are configured as a whole structure similar to the profile of a house, so that the mounting column 41 is mainly responsible for the opening and closing of the exhaust passage 12, and the conical platform 42 is mainly responsible for the opening and closing of the air vent hole 31.

[0055] The mounting column 41 is inserted into the accommodating groove 13, and cannot be separated from the accommodating groove 13 in the side swing movement, and further needs to ensure that the mounting column 41 can freely move in the accommodating groove 13. Specifically, the accommodating groove 13 includes a cylindrical structure, which is beneficial for the mounting column 41 to be inserted through the slot of the open structure. From the perspective that the mounting column 41 can freely move in the accommodating groove 13, the diameter of the mounting column 41 is smaller than the diameter of the accommodating groove 13, and then from the perspective that the mounting column 41 cannot be separated from the accommodating groove 13 in the side swing movement, the length of the mounting column 41 is greater than the length of the accommodating groove 13.

[0056] Further, the other end of the mounting column 41 away from the conical platform 42 is provided with a flat end face, the exhaust passage 12 includes a circular through hole, and the diameter of the through hole is smaller than the diameter of the mounting column 41. Combined with the form that the exhaust passage 12 and the accommodating groove 13 are concentrically arranged, the flat end face of the mounting column 41 can effectively block the exhaust passage 12 after abutting against the groove surface of the accommodating groove 13, and effectively avoid the exhaust passage 12 after the mounting column 41 is separated from the groove surface of the accommodating groove 13.

[0057] For the above-mentioned piston 3 fixedly installed on the end 11 of the core rod 1, the piston 3 further includes a clamping sleeve 33, the end 11 further includes a mounting ring groove 15 arranged on the radial outer side of the accommodating groove 13, and the clamping sleeve 33 extends radially into the mounting ring groove 15 and is clamped on the groove wall of the mounting ring groove 15, which can make the piston 3 move synchronously with the core rod 1, and provide effective movement space for the floating plug 4 inside the piston 3.

[0058] When sucking liquid, since the syringe is in a vertical posture, under the action of gravity, the conical platform 42 is in close contact with the inner side wall 32 of the piston 3 to block the air vent hole 31, and the mounting column 41 is separated from the exhaust passage 12. With the back pulling of the core rod 1, a negative pressure vacuum can be formed in the sealed chamber between the piston 3 and the syringe barrel 2, so that the sucked liquid enters the above-mentioned sealed chamber. Without mixing air, the outer air pressure communicated through the exhaust passage 12 will firmly embed the floating plug 4 on the inner side wall 32 of the piston 3, maintain the state of blocking the air vent hole 31, and maintain the normal operation of sucking liquid.

[0059] Once the air is mixed, the above-mentioned air pressure balance will be destroyed, the air will move upward under natural conditions, push the floating plug 4 away through the air vent hole 31 on the piston 3, make the conical platform 42 separate from the inner side wall 32 of the piston 3, and at the same time, the mounting column 41 automatically avoids the exhaust passage 12 to be communicated with the core rod cavity 14 which is in balance with the outer air pressure.

[0060] At the same time, along with the filling of the liquid, the floating plug 4 will float upwards under the action of the liquid buoyancy due to the instability of air pressure balance, so that the mounting column 41 gradually moves towards the air exhaust passage 12 until the air is completely exhausted, the liquid fills the gap between the piston 3 and the end 11 of the core rod 1, and the end surface of the mounting column 41 of the floating plug 4 is abutted against the groove wall of the accommodating groove 13, thereby completing the plugging of the air exhaust passage 12.

[0061] It is particularly pointed out that, in the state of air mixing, due to the formation of negative pressure vacuum in the suction sealed chamber, the perfusion liquid will maintain a transient compression pressure state, so that the compression trend and perfusion pressure of the perfusion liquid are sufficient to overcome the process of air entering the internal space of the piston 3 from the side of the core rod cavity 14, until the mixed air is completely expelled from the internal space of the piston 3, so that the suction liquid fills the internal space of the piston 3, thereby ensuring the effective and reliable air exhaust process during suction.

[0062] Based on the above-mentioned matching angle of the floating plug 4 and the air exhaust passage 12, it is required that the floating plug 4 can float on the top of the suction liquid after the liquid enters the piston 3 through the air hole 31, so the material density of the floating plug 4 needs to be less than the density of the liquid sucked by the syringe, and high molecular materials such as polypropylene and polyethylene can be used.

[0063] At the same time, in order to form the floating effect, the floating plug 4 can also be provided as a hollow structure as a whole, so that the floating plug 4 can gradually move towards the air exhaust passage 12 under the action of the buoyancy of the suction liquid, until all the air is automatically exhausted, and the mounting column 41 of the floating plug 4 is plugged on the air exhaust passage 12.

[0064] In combination Figures 4-5 In order to ensure normal suction and injection of the liquid, the liquid inlet 21 and the liquid outlet 22 are arranged on the syringe barrel 2, the liquid inlet 21 is arranged at the end of the syringe barrel 2, and the liquid can be perfused into the syringe barrel 2 through the liquid inlet 21 under the action of negative pressure vacuum.

[0065] The liquid outlet 22 is used for connecting related cooperation instruments to output the liquid medicine, and is arranged on the side wall of the syringe barrel 2 and adjacent to the liquid inlet 21. After the suction of the liquid is completed, the liquid is discharged through the liquid outlet 22. The adjacent arrangement can ensure that the liquid is completely discharged after the piston 3 is injected to the end of the syringe, and reduces the retention loss of the liquid medicine in the syringe barrel 2.

[0066] The lower end of the liquid outlet 22 is provided with a filter cotton 23, which can filter the liquid medicine or injection liquid, so as to avoid impurities or excessive particles from entering the blood.

[0067] Based on liquid inlet and liquid outlet need to carry out in closed condition, the self-bleeding ring handle syringe further comprises a sealing cap 5, the sealing cap 5 is used between liquid inlet 21 and liquid outlet 22, when the syringe is pumping liquid, the sealing cap 5 is capped on the liquid outlet 22, when the syringe is injecting liquid, the sealing cap 5 is capped on the liquid inlet 21, ensure the effective and reliable progress of liquid inlet and liquid outlet.

[0068] It should be noted that the features of the embodiments in the present application can be combined with each other without conflict.

[0069] The above is only the preferred embodiment of the present application and is not used to limit the present application, and the present application can have various changes and variations for those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A self-venting ring handle syringe characterized by, The injection device comprises a core rod and a syringe barrel, the core rod extends into the end of the syringe barrel, a piston is installed on the end, a vent hole is arranged on the piston, a floating plug is movably embedded between the end and the piston, and an exhaust passage is arranged on the end and can be opened and closed under the movable cooperation of the floating plug.

2. The self-venting ring handle syringe of claim 1, wherein, The floating plug comprises an integral mounting column and a conical platform, the end comprises a receiving groove, the floating plug is limitedly installed in the receiving groove through the mounting column, the core rod comprises a core rod cavity which is communicated with the outside, and the exhaust passage is arranged on the groove wall between the receiving groove and the core rod cavity.

3. The self-venting ring handle syringe of claim 2, wherein, The receiving groove comprises an open slot, the mounting column extends out of the slot and its length is greater than the length of the receiving groove, the conical platform is arranged outside the slot and its conical surface is oppositely directed to the piston.

4. The self-venting ring handle syringe of claim 2, wherein, The head end of the piston comprises a conical inner side wall, the conical angle of the conical platform is the same as that of the inner side wall, so that the conical platform can be fitted with the inner side wall, and the vent hole is arranged through the head end of the piston and comprises a plurality of vent holes which are uniformly distributed in the circumferential direction of the piston. The conical platform comprises an outer edge which radially extends from the mounting column, and the profile edge of the outer edge radially exceeds the opening position of the vent hole on the inner side wall.

5. The self-venting ring handle syringe of claim 2, wherein, The vent hole is obliquely arranged on the head end of the piston and gradually narrows from the outside to the inside along the radial direction of the piston, and a plurality of the vent holes are distributed on the head end of the piston in a diverging manner.

6. The self-venting ring handle syringe of claim 2, wherein, The receiving groove comprises a cylindrical structure, the diameter of the mounting column is smaller than that of the receiving groove, the exhaust passage comprises a circular through hole, and the diameter of the through hole is smaller than that of the mounting column, and the exhaust passage is concentrically arranged with the receiving groove.

7. The self-venting ring handle syringe of claim 2, wherein, The piston further comprises a clamping sleeve, the end further comprises a mounting ring groove, the mounting ring groove is arranged on the radial outside of the receiving groove, and the clamping sleeve extends into the mounting ring groove in the radial direction and is clamped on the groove wall of the mounting ring groove.

8. The self-venting ring handle syringe of any of claims 1-7, wherein, The material density of the floating plug is smaller than that of the liquid sucked by the injection device, or the floating plug is a hollow structure as a whole.

9. The self-venting ring handle syringe of any of claims 1-7, wherein, The syringe barrel is provided with a liquid inlet and a liquid outlet, the liquid inlet is arranged on the end of the syringe barrel, and the liquid outlet is arranged on the side wall of the syringe barrel and is arranged adjacent to the liquid inlet.

10. The self-venting ring handle syringe of claim 9, wherein, Further comprising a sealing cap, the sealing cap is used between the liquid inlet and the liquid outlet, the sealing cap is capped on the liquid outlet when the injection device sucks liquid, and the sealing cap is capped on the liquid inlet when the injection device injects liquid.

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