Injection device and sealing assembly thereof

Abstract

The utility model provides an injection device and a sealing assembly thereof, the sealing assembly comprises a cavity and a sealing piece, the cavity comprises a first end and a second end which are arranged oppositely, the first end is used for being connected with an injector of the injection device, and the first end is provided with a first through hole communicating the space in the cavity with the outside; the second end part is provided with a second through hole for communicating the space in the cavity with the outside; the sealing piece is completely or partially embedded into the second through hole; the first through hole is configured to be capable of injecting liquid in the injector into the space in the cavity and be in contact with the sealing element; the sealing element is configured to be in a breathable state when the sealing element is not in contact with the liquid and in a sealed state when the sealing element is in contact with the liquid, and neither gas nor liquid can pass through the sealing element. According to the injection device and the sealing assembly thereof, the sealing effect, reliability and safety of the injection device are improved through the ventilation state and the sealing state of the sealing piece.

Description

Technical Field

[0001] The present application relates to the technical field of medical equipment, and in particular to an injection device and a sealing assembly thereof. Background Art

[0002] Liquid samples in existing syringes are susceptible to contamination by air, for example, air can be sucked into the syringe by aspiration of the sample through a needle or incomplete filling of the syringe. In the case of drawing a blood sample, the purpose of drawing blood is to assess the patient's blood gas level (such as carbon dioxide and oxygen) or a variable that depends on the blood gas level (such as pH), and the introduction of air into the sample will change the true concentration of the gas components in the blood and cause subsequent data analysis errors. The existing technology for removing air from a syringe after blood drawing is to use a method of tilting the syringe upward so that the bubbles rise to the top, then plug the open head of the syringe with gauze, and advance the syringe plunger to discharge the air. Although this technology is effective in removing air from the syringe, it may also cause some blood to be discharged. For example, if the plunger is pushed too much, or if the blood is intercepted by the capillary action of the uppermost part of the needle tube, the blood will be discharged, and there is a risk of exposing the staff to blood that may contain any amount of biological hazards. Utility Model Content

[0003] In order to solve the above-mentioned technical problems, the embodiments of the present application provide an injection device and a sealing assembly thereof with high safety and reliability.

[0004] In one aspect, an embodiment of the present application provides a sealing assembly for an injection device, comprising:

[0005] A cavity, the cavity comprising a first end and a second end disposed opposite to each other, the first end being used to connect to the syringe of the injection device, the first end having a first through hole connecting the space inside the cavity with the outside, and the second end having a second through hole connecting the space inside the cavity with the outside;

[0006] A sealing member, fully or partially embedded in the second through hole;

[0007] Among them, the first through hole is configured to be able to inject the liquid in the syringe into the space inside the cavity and contact the seal; the seal is configured to be in a breathable state when the seal is not in contact with the liquid, and the seal is in a sealed state when the seal is in contact with the liquid, and neither gas nor liquid can pass through the seal.

[0008] According to one embodiment of the present application, the seal is made of a porous material. When the seal is not in contact with liquid, the holes on the porous material allow gas to pass through; when the seal is in contact with liquid, the porous material expands to close the holes and block the passage of gas.

[0009] According to an embodiment of the present application, the sealing member is interference fit with the second end portion.

[0010] According to an embodiment of the present application, the sealing member does not fill up the inner space of the cavity, so as to form an accommodating cavity between the first through hole and the sealing member.

[0011] According to one embodiment of the present application, a docking groove is provided on the first end portion, the syringe includes a cone head, the cone head can be inserted into the docking groove, the first through hole is located at the bottom of the docking groove, and the docking groove is connected to the inner space of the cavity through the first through hole.

[0012] According to one embodiment of the present application, a guide tube that can be inserted into the cone head is passed through the first through hole, the guide tube is at least partially located in the docking groove, and there is a gap between the guide tube and the inner wall of the docking groove in which the cone head can be embedded, and the guide tube is connected to the space inside the cavity.

[0013] According to an embodiment of the present application, the guide tube is detachably connected to the first end portion.

[0014] According to an embodiment of the present application, a cross-sectional area of ​​the docking groove gradually increases in a direction away from the first through hole.

[0015] An embodiment of the present application further provides an injection device, which includes the sealing assembly described in the above embodiment, and also includes the syringe, and the sealing assembly and the syringe are detachably connected.

[0016] According to one embodiment of the present application, a docking groove is provided on the first end portion, and the syringe includes a cone head, which can be inserted into the docking groove, and the first through hole is located at the bottom of the docking groove, and the docking groove is connected with the inner space of the cavity through the first through hole, and a stopping block is provided on the outer wall of the docking groove away from the end of the first through hole, and a side wall is provided around the cone head, and a threaded groove is provided on the side wall, and during the installation process of the sealing assembly and the syringe, the sealing assembly can be rotated relative to the syringe, so that the stopping block slides along the threaded groove, and then the cone head presses against the bottom of the docking groove.

[0017] The injection device and its sealing assembly provided in the present application utilize the air permeability and sealing states of the seal to both remove residual gas from the injection device and prevent external gas from entering the injection device, thereby improving the sealing effect, reliability and safety of the injection device. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 It is a structural schematic diagram of an embodiment of a sealing assembly of the present application;

[0020] Figure 2 yes Figure 1 an axial cross-sectional view of the seal assembly shown;

[0021] Figure 3 yes Figure 1 An axial cross-sectional view of the cavity of the seal assembly shown;

[0022] Figure 4 is a schematic structural diagram of an embodiment of the injection device of the present application;

[0023] Figure 5 yes Figure 4 A schematic cross-sectional view of the injection device shown;

[0024] Figure 6 yes Figure 5 A partial enlarged view of the injection device shown;

[0025] Figure 7 yes Figure 4 A schematic cross-sectional view of a syringe of the injection device shown;

[0026] Figure 8 yes Figure 7 A partial cross-sectional view of the structure of the syringe shown. DETAILED DESCRIPTION

[0027] The present application is further described in detail below in conjunction with the accompanying drawings and examples. It is particularly noted that the following examples are only used to illustrate the present application, but are not intended to limit the scope of the present application. Similarly, the following examples are only some embodiments of the present application rather than all embodiments, and all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present application.

[0028] The terms "first", "second", and "third" in the embodiments of the present application are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Thus, the features defined as "first", "second", and "third" can expressly or implicitly include at least one of the features. In the description of the present application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined. In the embodiments of the present application, all directional indications (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication also changes accordingly. The terms "including" and "having" in the embodiments of the present application and any of their variations are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but optionally also includes steps or units that are not listed, or optionally also includes other steps or components inherent to these processes, methods, products, or devices.

[0029] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0030] The present application provides a sealing assembly 10 for an injection device 1. Figures 1 to 3 , Figure 1 It is a structural schematic diagram of an embodiment of a sealing assembly of the present application;

[0031] Figure 2 yes Figure 1 an axial cross-sectional view of the seal assembly shown; Figure 3 yes Figure 1The axial cross-sectional view of the cavity of the sealing assembly is shown. The sealing assembly 10 includes a cavity 120 and a sealing member 110, the cavity 120 includes a first end 121 and a second end 122 disposed opposite to each other, the first end 121 is used to connect with the syringe 20 of the injection device 1, the first end 121 has a first through hole 12101 connecting the inner space 1202 of the cavity 120 with the outside, and the second end 122 has a second through hole 12201 connecting the inner space 1202 of the cavity 120 with the outside; the sealing member 110 is fully or partially embedded in the second through hole 12201; wherein the first through hole 12101 is configured to be able to inject the liquid in the syringe 20 into the inner space 1202 of the cavity 120 and contact the sealing member 110; the sealing member 110 is configured to be in a gas permeable state when the sealing member 110 is not in contact with the liquid, and in a sealed state when the sealing member 110 is in contact with the liquid, and neither gas nor liquid can pass through the sealing member 110.

[0032] Optionally, the seal 110 may be completely embedded in the second through hole 12201, and the seal 110 and the surface 1221 of the second end 122 away from the first end 121 may be flush. In other embodiments, the seal 110 may be only partially embedded in the second through hole 12201, with the other part exposed to the outside.

[0033] When the seal 110 is in a breathable state, the residual gas in the syringe 20 can be discharged from the injection device 1 through the first through hole 12101 and the seal 110. After the residual gas is exhausted, the liquid in the syringe 20 will contact the seal 110, causing the seal 110 to be transformed into a sealed state. The second through hole 12201 is blocked by the seal 110, so that external gas cannot enter the injection device 1 through the seal 110, thereby ensuring the sealing and reliability of the injection device 1. At the same time, the liquid in the syringe 20 cannot leak to the outside through the seal 110, thereby reducing the risk of staff coming into contact with liquids that may contain harmful substances, thereby ensuring the safety of the injection device 1 during use, storage and transportation.

[0034] Optionally, the seal 110 is made of a porous material having a tiny pore structure. When the seal 110 is not in contact with liquid, the pores in the porous material can pass through gas; when the seal 110 is in contact with liquid, the porous material itself will expand to close the pores and block the passage of gas.

[0035] Optionally, the material of the sealing member 110 is polyethylene plastic, and the sealing member 110 can be sintered from polyethylene plastic.

[0036] Optionally, the sealing member 110 is fixed to the second end portion 122 of the cavity 120 , and the sealing member 110 and the second end portion 122 are interference fit.

[0037] Optionally, the shape of the seal 110 may be cylindrical, and the shape of the cavity 120 may be a hollow cylindrical structure, and the seal 110 and the cavity 120 may be interference fit. In some other embodiments, the seal 110 may also be a prism, a frustum, a prism, a sphere, or other shapes, which will not be described in detail here. Correspondingly, the second end 122 of the cavity 120 may also be a hollow frustum, a prism, a prism, or other shapes, so as to have an interference fit with the seal 110.

[0038] In some embodiments, the sealing member 110 may cover the first through hole 12101, and the cross-sectional area of ​​the sealing member 110 is larger than the cross-sectional area of ​​the first through hole 12101. The liquid in the syringe 20 may directly contact the sealing member 110 after passing through the first through hole 12101. When the sealing member 110 contacts the liquid, the sealing member 110 turns into a sealing state, and the first through hole 12101 may be blocked.

[0039] Optionally, the seal 110 does not fill the inner space 1202 of the cavity 120 to form a receiving cavity 1201 between the first through hole 12101 and the seal 110. The first through hole 12101 is in communication with the receiving cavity 1201. When the seal 110 is in a breathable state, the gas in the receiving cavity 1201 can be discharged from the seal 110. When the syringe 20 discharges residual gas, the residual gas can be discharged from the seal 110 through the receiving cavity 1201. In order to ensure that the residual gas can be completely discharged, the syringe 20 needs to discharge part of the liquid. The receiving cavity 1201 can be used to accommodate the liquid discharged by the syringe 20. When the liquid contacts the seal 110, the seal 110 is transformed into a sealed state, so that neither the liquid nor the gas can pass through the seal 110, thereby reducing the hidden danger of air re-entering the syringe 20 through the sealing assembly 10 during the storage and transportation of the injection device 1.

[0040] The present application also provides an injection device 1, see Figure 4 , Figure 4 The injection device 1 includes the sealing assembly 10 in the above embodiment, and the injection device 1 also includes a syringe 20, and the sealing assembly 10 and the syringe 20 are detachably connected.

[0041] Optionally, please also refer to Figure 2 , Figure 5 and Figure 6 , Figure 5 yes Figure 4 A schematic cross-sectional view of the injection device shown; Figure 6 yes Figure 5A partial enlarged view of the injection device shown. A docking groove 12102 is provided on the first end portion 121 of the sealing assembly 10, and the syringe 20 includes a cone head 210, which can be inserted into the docking groove 12102. The first through hole 12101 is located at the bottom 1212 of the docking groove 12102, and the docking groove 12102 is connected to the inner space 1202 of the cavity 120 through the first through hole 12101. Optionally, the docking groove 12102 is located on the side of the first through hole 12101 away from the accommodating cavity 1201, and the docking groove 12102 is connected to the accommodating cavity 1201 through the first through hole 12101.

[0042] Optionally, the cross-sectional area of ​​the docking groove 12102 gradually increases in a direction away from the first through hole 12101 .

[0043] Alternatively, if Figure 3 As shown, the inner wall 1214 of the docking groove 12102 can form a 6% taper to seal with a common syringe or a Luer connector syringe.

[0044] Optionally, a guide tube 130 that can be inserted into the cone head 210 is passed through the first through hole 12101, and the guide tube 130 is at least partially located in the docking groove 12102, and there is a gap 12103 between the guide tube 130 and the inner wall 1214 of the docking groove 12102 into which the cone head 210 can be embedded, and the guide tube 130 is connected to the inner space 1202 of the cavity 120.

[0045] Optionally, the guide tube 130 is fixed to the bottom 1212 of the docking groove 12102, and the guide tube 130 and the cavity 120 are an integral structure, and the guide tube 130 and the cavity 120 can be integrally injection molded.

[0046] Optionally, in some other embodiments, the guide tube 130 and the cavity 120 may be independent structures, and the guide tube 130 may be fixed to the first end 121 by interference fit. Optionally, the guide tube 130 and the first end 121 are detachably connected. The guide tube 130 and the first end 121 may be connected by threads, and optionally, the guide tube 130 is fastened in the through hole 12101 by threads.

[0047] Optionally, the length of the portion of the guide tube 130 located in the docking groove 12102 is less than the depth of the docking groove 12102. The guide tube 130 may extend in a direction away from the docking groove 12102, so that a portion of the guide tube 130 may be located in the accommodating cavity 1201.

[0048] Optionally, a stop block 1211 is provided on an outer wall 1215 of the end 1213 of the docking groove 12102 away from the first through hole 12101. Figures 6 to 8 , Figure 7 yes Figure 4A schematic cross-sectional view of a syringe of the injection device shown; Figure 8 yes Figure 7 The partial structural cross-sectional view of the syringe shown. The cone head 210 is surrounded by a side wall 230, and the side wall 230 is provided with a thread groove 2301. During the installation of the sealing assembly 10 and the syringe 20, the sealing assembly 10 can rotate relative to the syringe 20, so that the stop block 1211 slides along the thread groove 2301 on the side wall 230, and then the cone head 210 abuts against the bottom 1212 of the docking groove 12102. Optionally, when the sealing assembly 10 is installed on the syringe 20, the outer side 213 of the cone head 210 fits with the inner wall 1214 of the docking groove 12102, and the inner side 212 of the cone head 210 fits with the guide tube 130, so that when the liquid in the syringe 20 flows to the sealing assembly 10, it cannot contact the top 211 of the cone head 210 close to the seal 110.

[0049] Optionally, the number of the stopper blocks 1211 is two, and they are respectively located on opposite sides of the outer wall 1215 of the docking groove 12102. The number of the stopper blocks 1211 can also be one or more, which will not be described in detail here. In some other embodiments, the stopper blocks 1211 can also be a continuous convex edge arranged around the docking groove 12102.

[0050] Optionally, a guide channel 2101 is formed in the cone head 210, and the guide tube 130 can be inserted into the guide channel 2101. The guide channel 2101 can be connected to the accommodating cavity 1201 through the guide tube 130. The syringe 20 also includes a tube body 220, and a liquid such as a sample or medicine to be tested is stored in the tube body 220. The side wall 230 is fixed to the first end 221 of the tube body 220 close to the cone head 210.

[0051] Optionally, a push rod 240 is inserted into the second end 222 of the tube body 220 away from the cone head 210, and the push rod 240 can slide along the tube body 220 to change the storage space 2201 in the tube body 220. When the push rod 240 slides toward the cone head 210, the liquid and residual gas in the tube body 220 are pressed and move toward the cone head 210, and the liquid and residual gas can directly reach the accommodating cavity 1201 through the guide channel 2101 and the guide tube 130. After the residual gas is discharged from the seal 110, the liquid contacts the seal 110, so that the seal 110 is changed from a breathable state to a sealed state, so that neither the liquid nor the gas can pass through the seal 110, thereby limiting the liquid from further flowing out of the injection device 1 and preventing the outside air from flowing into the injection device 1. At the same time, since the cone head 210 is embedded in the gap 12103 formed between the guide tube 130 and the inner wall 1214 of the docking groove 12102, the liquid in the tube body 220 cannot contact the outer side 213 of the cone head 210 and the top 211 of the cone head 210 away from the tube body 220. After the sealing assembly 10 is removed from the syringe 20, no liquid will remain at the top 211 of the cone head 210, reducing the risk of staff coming into contact with liquids such as blood that may contain any order of biological hazards.

[0052] The injection device 1 and its sealing assembly provided in the present application utilize the air permeability and sealing states of the seal 110 to both remove residual gas in the injection device 1 and prevent external gas from entering the injection device 1, thereby improving the sealing effect and reliability of the injection device 1; the liquid in the syringe 20 can directly reach the accommodating cavity 1201 through the guide tube 130, so that no liquid will remain at the top 211 of the cone head 210, thereby improving the safety of the injection device 1.

[0053] The above descriptions are only some embodiments of the present application, and do not limit the protection scope of the present application. Any equivalent device or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly used in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A sealing assembly for an injection device, characterized in that: include: A cavity, the cavity comprising a first end and a second end disposed opposite to each other, the first end being used to connect to the syringe of the injection device, the first end having a first through hole connecting the space inside the cavity with the outside, and the second end having a second through hole connecting the space inside the cavity with the outside; A sealing member, fully or partially embedded in the second through hole; Among them, the first through hole is configured to be able to inject the liquid in the syringe into the space inside the cavity and contact the seal; the seal is configured to be in a breathable state when the seal is not in contact with the liquid, and the seal is in a sealed state when the seal is in contact with the liquid, and neither gas nor liquid can pass through the seal.

2. The sealing assembly according to claim 1, characterized in that: The seal is made of a porous material. When the seal is not in contact with liquid, the holes on the porous material allow gas to pass through. When the seal is in contact with liquid, the porous material expands to close the holes and block the passage of gas.

3. The sealing assembly according to claim 1 or 2, characterized in that: The seal is interference fit with the second end.

4. The sealing assembly according to claim 1 or 2, characterized in that: The sealing member does not fill up the inner space of the cavity, so as to form an accommodating cavity between the first through hole and the sealing member.

5. The sealing assembly according to claim 1 or 2, characterized in that: The first end portion is provided with a docking groove, the syringe comprises a cone head, the cone head can be inserted into the docking groove, the first through hole is located at the bottom of the docking groove, and the docking groove is connected with the inner space of the cavity through the first through hole.

6. The sealing assembly according to claim 5, characterized in that The first through hole is provided with a guide tube which can be inserted into the cone head. The guide tube is at least partially located in the docking groove. There is a gap between the guide tube and the inner wall of the docking groove in which the cone head can be embedded. The guide tube is connected to the space inside the cavity.

7. The sealing assembly according to claim 6, characterized in that: The guide tube is detachably connected to the first end portion.

8. The sealing assembly according to claim 5, characterized in that: The cross-sectional area of ​​the docking groove gradually increases in a direction away from the first through hole.

9. An injection device, characterized in that: The injection device comprises the sealing assembly according to any one of claims 1 to 4, and further comprises the syringe, wherein the sealing assembly and the syringe are detachably connected.

10. The injection device according to claim 9, characterized in that A docking groove is provided on the first end portion, and the syringe includes a cone head, which can be inserted into the docking groove. The first through hole is located at the bottom of the docking groove, and the docking groove is connected with the inner space of the cavity through the first through hole. A stopping block is provided on the outer wall of the docking groove away from the end of the first through hole. A side wall is provided around the cone head, and a threaded groove is provided on the side wall. During the installation process of the sealing assembly and the syringe, the sealing assembly can be rotated relative to the syringe, so that the stopping block slides along the threaded groove, and then the cone head abuts against the bottom of the docking groove.

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