Injection site fixation device for an injection device, injection linkage

Abstract

The application relates to the technical field of injectors, in particular to an injection site fixing device and an injection linkage device of an injection device. The injection site fixing device comprises a negative pressure generating device, a sealing mechanism and a suction disc. The suction disc comprises a negative pressure cavity, the negative pressure generating device is connected with the negative pressure cavity, and the negative pressure generating device is used for generating negative pressure in the negative pressure cavity so that the injection site of a user is adsorbed in the suction disc under the action of the negative pressure in the negative pressure cavity. The sealing mechanism is configured to be capable of switching between an open state and a closed state. When the suction disc is not adsorbed to the injection site of the user, the sealing mechanism is in the closed state to isolate the negative pressure cavity and a needle cavity. When the suction disc is adsorbed to the injection site of the user and the injection needle is started to pierce the injection site, the sealing mechanism is in the open state to make the negative pressure cavity and the needle cavity communicate. The injection site fixing device can enable the user to operate with one hand by fixing the suction disc to the injection site, the operation is simple, and thus the user can inject the abdomen and other parts.

Description

[0001] This application is required to be filed with the State Intellectual Property Office of the People's Republic of China on July 7, 2025, application number: Priority is claimed in Chinese patent application No. 202510937356.6, entitled "An Injection Device," the entire contents of which are disclosed herein. The references are incorporated herein by reference. This application requires filing with the State Intellectual Property Office of the People's Republic of China on February 3, 2026. The invention with application number 202610155233.1 and invention title "Injection Site Fixing Device and Injection Linkage Device for Injection Apparatus" is... The priority of the Chinese patent application, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of syringe technology, and in particular to an injection site fixing device and an injection linkage device for an injection apparatus. Background Technology

[0003] Early use of insulin is essential for the treatment of diabetes. It can not only better control the condition and allow the already diminished pancreatic beta cells to rest temporarily, but also avoid the liver and kidney toxicity caused by long-term use of hypoglycemic drugs and reduce or delay the occurrence of complications.

[0004] Currently, insulin injections are typically administered using a pen injector, which combines the medication and syringe into one device. Resembling a pen in shape, it mainly consists of a cap, cartridge, syringe barrel, and needle. Compared to traditional syringes, pen injections offer numerous advantages, including ease of use, convenience, accurate dosage, and less pain, meeting the self-management needs in the field of chronic disease management. Furthermore, with continuous technological advancements, insulin injectors are becoming increasingly convenient to use, and needles are becoming finer, resulting in less pain during injection.

[0005] Even so, the vast majority of diabetic patients still prefer to take oral hypoglycemic drugs to control their blood sugar rather than inject insulin, mainly for two reasons: First, existing insulin injectors are complex to operate, requiring both hands to perform the injection and withdrawal. Diabetic patients need to make multiple subcutaneous injections every day, and the complexity of the procedure makes many people hesitant to inject insulin. Second, current insulin injectors on the market are mainly suitable for abdominal injections. Injecting in other parts of the body is not only inconvenient but also more painful. However, repeated injections in the same area can lead to local subcutaneous fat hypertrophy and fibrous tissue hyperplasia. Insulin is a protein hormone that stimulates fat tissue hyperplasia, and frequent injections in the same area can cause fat nodules (also known as abnormal lipid distribution) on the skin. Summary of the Invention

[0006] This application discloses an injection site fixing device and an injection linkage device for an injection device. The injection site fixing device can be attached to the user's abdomen and other injection sites, so that when the injection device selects the automatic injection mode, the injection device can automatically complete the skin fixing, needle insertion and injection operations, and can inject into the user's abdomen and other sites.

[0007] To achieve the above objectives, this application provides the following technical solution: In a first aspect, this application provides an injection site fixing device for an injection apparatus. The injection site fixing device includes a negative pressure generating device, a sealing mechanism, and a suction cup. The suction cup includes a negative pressure chamber, and the sealing mechanism is used to isolate the needle cavity containing the injection needle from the negative pressure chamber. The negative pressure generating device is connected to the negative pressure chamber and is used to generate negative pressure in the negative pressure chamber so that the user's injection site is adsorbed into the suction cup under the negative pressure in the negative pressure chamber. The sealing mechanism is configured to switch between an open state and a closed state. When the suction cup is not adsorbed onto the user's injection site, the sealing mechanism is in a closed state to isolate the negative pressure chamber and the needle cavity. When the suction cup is adsorbed onto the user's injection site and the injection needle is activated to insert the needle into the injection site, the sealing mechanism is in an open state to connect the negative pressure chamber and the needle cavity.

[0008] When the suction cup is not attached to the user's injection site, the sealing mechanism is closed to isolate the negative pressure chamber and the needle chamber, preventing the negative pressure generated in the negative pressure chamber from affecting the injection needle. The negative pressure generating device creates negative pressure in the negative pressure chamber, causing the user's injection site to be attached to the suction cup under the negative pressure, thus fixing the suction cup to the user's injection site. When the suction cup is attached to the user's injection site and the injection needle is activated to insert into the injection site, the sealing mechanism opens to connect the negative pressure chamber and the needle chamber, allowing the needle tip to pierce the skin attached to the negative pressure chamber and complete the injection. After the injection is completed and the needle is removed, the sealing mechanism closes, once again isolating the injection needle chamber from the suction cup chamber. Throughout the entire injection process, the user cannot see the needle, which helps eliminate the fear of needles and significantly reduces the pain of injections. Moreover, the injection site fixation device, by fixing the suction cup to the user's injection site, allows the user to operate with one hand, making the operation simple. This allows the user to inject into the abdomen and other areas, expanding the range of body parts that can be injected, while avoiding the harm caused by long-term injections in one site.

[0009] In one possible implementation, the negative pressure chamber and the needle chamber are connected through a connecting port. The sealing mechanism includes a seal and a driving mechanism. The driving mechanism is driven to the seal and is used to drive the seal to reciprocate so that the seal moves closer to and blocks the connecting port, or moves away from the connecting port to open the connecting port.

[0010] In one possible implementation, the drive mechanism includes a drug core holder and an elastic element. The drug core holder carries the syringe and moves with it. The end of the drug core holder near the negative pressure chamber abuts against a seal, and the elastic element is connected to the seal. When the syringe is inserted into the injection site, the drug core holder moves closer to the injection site, and the seal moves away from the communication port and compresses the elastic element under the pressure of the drug core holder, thereby opening the sealing mechanism. After the injection is completed, the drug core holder moves away from the injection site, and the seal returns to its initial state under the drive of the elastic element, thereby closing the sealing mechanism.

[0011] In one possible implementation, the sealing mechanism can also be opened or closed by a motor, electromagnet, air pump, or cylinder.

[0012] In one possible implementation, the suction cup includes a first sealing part and a second sealing part arranged coaxially. The first sealing part is located at the outer edge of the second sealing part and is used to seal in contact with the user's skin. Both the first sealing part and the second sealing part are annular structures and surround to form a negative pressure cavity. The height of the second sealing part relative to the skin surface is higher than the height of the first sealing part relative to the skin surface.

[0013] In one possible implementation, the injection site fixation device further includes an air guide tube, which includes an air inlet and a connection port. The air inlet communicates with a negative pressure chamber, and the connection port communicates with a negative pressure generating device. The height of the air inlet relative to the skin surface is higher than the height of the second sealing part relative to the skin surface, so that at least a portion of the chamber of the negative pressure chamber communicating with the air inlet forms a negative pressure suction channel. When the first sealing part and the second sealing part are sealed with the skin surface, the negative pressure suction channel maintains a negative pressure state under the action of the negative pressure generating device, thereby keeping the first sealing part and the second sealing part always sealed with the skin.

[0014] Secondly, this application provides an injection linkage device, which includes a housing, a syringe, and an injection site fixing device as described in the first aspect. The suction cup is detachably connected to the housing, the syringe is installed inside the housing, and the end of the syringe near the suction cup is provided with an injection needle.

[0015] In one possible implementation, the injection linkage device further includes a drug delivery component and a linkage device disposed within the housing. The suction cup is detachably connected to the housing, the syringe is installed within the housing, and an injection needle is provided at the end of the syringe near the suction cup. The drug delivery component includes a syringe barrel and a piston rod connected to the syringe barrel, with drug solution contained within the syringe barrel. The linkage device is connected to both the syringe and the piston rod, and the injection device is configured to switch between at least a manual injection mode and an automatic injection mode. In the manual injection mode, the suction cup and housing are separated, allowing the user to manually insert the syringe and perform the injection. In the automatic injection mode, the suction cup and housing are connected, and the suction cup adheres to the injection site, enabling the linkage device to automatically drive the syringe to perform the insertion and automatically drive the piston rod to perform the injection.

[0016] In the manual injection mode, the suction cup and housing separate. The user aligns the needle with the injection site, inserts the needle manually, and then manually pushes the piston rod to inject the medication. In the automatic injection mode, the suction cup first secures the housing to the user's injection site. Then, a linkage mechanism drives the syringe to automatically insert the needle, followed by the piston rod to automatically inject the medication. The injection device in this application can automatically complete the fixation of the injection site, the needle insertion, and the injection. The user cannot see the needle during the entire injection process, eliminating the fear of needles and significantly reducing the pain of injections. This allows for one-handed operation, simplifying the process and enabling users to inject into the abdomen and other areas, expanding the range of body sites that can be injected while avoiding the harm caused by long-term injections at one site.

[0017] In one possible implementation, the linkage device includes a drive assembly and an injection plunger. The injection plunger is connected to a piston rod and can slide along the height direction of the syringe. The drive assembly includes a drive unit and a clutch mechanism. The clutch mechanism is connected to the syringe, and when the clutch mechanism is closed or open, the syringe and the drive unit are in a coupled or decoupled state. Specifically, when the clutch mechanism is closed, the syringe and the drive unit are coupled, and the drive unit drives the syringe from its initial position toward the injection site, causing the injection needle to penetrate the injection site. When the clutch mechanism is open, the syringe and the drive unit are decoupled. After the drive unit is connected to the injection plunger, it drives the piston rod toward the bottom of the syringe via the injection plunger to inject the medication into the user's body. When the clutch mechanism is closed again, the syringe and the drive unit are coupled again, and the drive unit drives the syringe away from the injection site to remove the injection needle from the injection site and return it to its initial position.

[0018] Understandably, after the housing is fixed to the user's injection site by the suction cup, the user triggers the button to close the clutch mechanism, coupling the syringe and drive unit. The drive unit then moves the syringe and injection plunger towards the injection site, inserting the needle. After insertion, the clutch mechanism opens, decoupling the syringe and drive unit. The drive unit connects to the injection plunger, moving it towards the bottom of the syringe to squeeze the medication and inject it into the user's body. After injection, the clutch mechanism closes again, re-coupling the syringe and drive unit. The drive unit then moves the syringe away from the injection site, removing the needle and returning the syringe to its initial position. The injection device in this application can automatically complete the processes of fixing the injection site, insertion, injection, removal, and resetting, allowing the user to operate with one hand. This enables injections to the abdomen and other areas, expanding the range of body sites that can be injected and avoiding the harm caused by prolonged injections at a single site.

[0019] In one possible implementation, the clutch mechanism includes a first clutch, and the drive unit includes a first drive member and a transmission assembly. The transmission assembly is connected to the output end of the first drive member, and the first clutch is mounted on the syringe. When the first clutch is closed, the transmission assembly and the syringe are coupled, and the first drive member drives the syringe from its initial position toward the injection site near the user through the transmission assembly, causing the injection needle to pierce the injection site. When the first clutch is open, the transmission assembly and the syringe are decoupled, and the first drive member drives the transmission assembly to continue approaching the injection site until the transmission assembly abuts against the injection plunger. The drive unit then drives the injection plunger to move toward the bottom of the syringe to inject the medication into the user's body. When the first clutch is closed again, the transmission assembly and the syringe are coupled again, and the drive unit drives the syringe to move away from the injection site to remove the injection needle from the injection site and return it to its initial position. The first clutch is an electronic clutch.

[0020] In one possible implementation, the transmission assembly includes a lead screw and a nut sleeved on the lead screw, the lead screw being connected to the output end of the first drive member; when the first clutch is closed, the lead screw and the syringe are coupled, and the first drive member drives the syringe from its initial position toward the injection site near the user through the lead screw and nut assembly, causing the injection needle to pierce the injection site; when the first clutch is open, the lead screw and the syringe are decoupled, and the first drive member drives the lead screw to move the nut toward the injection site until the nut abuts against the injection plunger, and the drive unit drives the injection plunger toward the bottom of the syringe to inject the medication into the user's body; when the first clutch is closed again, the lead screw and the syringe are coupled again, and the drive unit drives the syringe away from the injection site to remove the injection needle from the injection site and return it to its initial position.

[0021] In one possible implementation, the linkage device further includes a needle-sticking plunger, a clutch mechanism including a second clutch, and a drive unit including a second drive component and a transmission assembly. The transmission assembly is connected to the output end of the second drive component, and the needle-sticking plunger is fixedly connected to the transmission assembly. The second clutch is mounted on the syringe. When the second clutch is closed, the transmission assembly is coupled to the syringe via the needle-sticking plunger. The second drive component drives the syringe from its initial position toward the injection site, causing the needle to pierce the injection site. When the second clutch is open, the transmission assembly and the syringe are decoupled. The second drive component drives the transmission assembly to continue approaching the injection site until the transmission assembly connects to the injection plunger. The drive unit then drives the injection plunger toward the bottom of the syringe to inject the medication into the user's body. When the second clutch closes again, the transmission assembly is coupled to the syringe again via the needle-sticking plunger. The drive unit drives the syringe away from the injection site to remove the needle from the injection site and return it to its initial position. The second clutch can be selected from an electronic clutch or a mechanical clutch.

[0022] In one possible implementation, the transmission assembly includes a lead screw and a nut sleeved on the lead screw. The lead screw is connected to the output end of the second drive unit, and the needle push rod is fixedly connected to the nut. When the second clutch is closed, the lead screw is coupled to the syringe via the needle push rod. The second drive unit drives the syringe from its initial position toward the injection site near the user through the lead screw and nut assembly, causing the injection needle to pierce the injection site. When the second clutch is open, the lead screw and the syringe are decoupled. The second drive unit drives the lead screw to move the nut closer to the injection site until the nut connects to the injection push rod. The drive unit then drives the injection push rod to move toward the bottom of the syringe to inject the medication into the user's body. When the second clutch is closed again, the lead screw is coupled to the syringe again via the needle push rod. The drive unit then drives the syringe to move away from the injection site to remove the injection needle from the injection site and return it to its initial position.

[0023] In one possible implementation, a first support is provided within the housing, and the second clutch includes a support seat and a positioning pin. The support seat is fixed to the syringe and has a through hole. The positioning pin passes through the through hole and, along the axial direction of the through hole, includes a first end and a second end. The surface of the needle push rod facing the first end has a first limiting groove, and the surface of the first support facing the second end has a second limiting groove. When the first end is inserted into the first limiting groove, the second end abuts against the surface of the first bracket, the second clutch is in the closed state, the needle push rod and the syringe are coupled, so that the syringe and the lead screw are indirectly coupled. When the second end is inserted into the second limiting groove, the first end moves out of the first limiting groove, the second clutch is in the open state, the needle push rod and the syringe are decoupled, so that the syringe and the lead screw are in the decoupled state.

[0024] In one possible implementation, the injection linkage device further includes a start position sensor and an end position sensor. The start position sensor is located at the top of the housing and is used to detect whether the syringe is in the initial position. The end position sensor is located at the bottom of the housing and is used to detect whether the end of the injection plunger near the injection needle has reached a preset position. The preset position is the position of the end of the injection plunger near the injection needle when the injection plunger injects a preset dose of medication into the user's body.

[0025] In one possible implementation, the injection linkage device further includes a dose adjustment mechanism and an injection dose sensor. The dose adjustment mechanism is connected to the injection plunger and is used to adjust the dose of the drug solution in the syringe. The injection dose sensor is used to detect the actual dose of the drug solution injected into the user's body.

[0026] In one possible implementation, the injection linkage device further includes a needle cap, a housing for accommodating the injection needle, syringe, and drive assembly, a needle cap for accommodating the injection needle, one end of the needle cap being detachably connected to the housing, and the other end of the needle cap being detachably connected to the needle cavity; the injection device further includes an injection cover for accommodating the suction cup, and the injection cover being detachably connected to the needle cavity. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of an injection device including an injection site fixation device according to an embodiment of this application; Figure 2 This is a schematic diagram of the internal structure of an injection device including an injection site fixation device according to an embodiment of this application; Figure 3 This is a schematic diagram of the structure of an injection device with the sealing mechanism in a closed state according to an embodiment of this application; Figure 4 This is a schematic diagram of the structure of an injection device with the sealing mechanism in the open state according to an embodiment of this application; Figure 5 This is a schematic diagram of the suction cup structure according to one embodiment of this application; Figure 6 This is a schematic diagram of the suction cup structure according to one embodiment of this application; Figure 7 This is a cross-sectional view of a suction cup according to an embodiment of this application; Figure 8 This is a schematic diagram of the structure of an injection device according to an embodiment of this application; Figure 9 This is an exploded view of an injection device according to an embodiment of this application; Figure 10 This is a schematic diagram of the internal structure of an injection device according to an embodiment of this application; Figure 11 This is a schematic diagram of the internal structure of an injection device according to an embodiment of this application; Figure 12 This is a schematic diagram of the injection device with the syringe in the initial position according to another embodiment of this application; Figure 13 This is a schematic diagram of the injection device when the needle insertion is completed according to another embodiment of this application; Figure 14 This is a schematic diagram of the injection device when the syringe is in the terminated position, according to another embodiment of this application. Figure 15 This is a schematic diagram of the internal structure of an injection device according to another embodiment of this application; Figure 16 This is a schematic diagram of the internal structure of an injection device according to another embodiment of this application; Figure 17 This is a partial structural schematic diagram of an injection device according to an embodiment of this application.

[0028] Reference numerals: 110-Housing; 111-First support; 120-Needle cap; 130-Injection cap; 200-Injection site fixing device; 210-Negative pressure generating device; 220-Sealing mechanism; 221-Sealing element; 221a-First sealing shell; 221b-Second sealing shell; 222-Drive mechanism; 222a-Drug core support; 230-Suction cup; 230a-First sealing part; 230b-Second sealing part; 230c-Connecting part; 231-Needle cavity; 232-Negative pressure cavity; 2321-Negative pressure suction channel; 233-Connecting port; 240-Gas delivery tube; 250-Pressure sensor; 310-Injector; 320-Injection needle; 330-Drug core support. Liquid infusion assembly; 331-piston rod; 420-injection plunger; 421-protrusion; 430-needle plunger; 500-drive assembly; 510-drive unit; 511a-first drive component; 511b-second drive component; 512-lead screw and nut assembly; 512a-lead screw; 512b-nut; 520-clutch mechanism; 521-first clutch; 522-second clutch; 522a-support seat; 522b-positioning pin; 522b1-first end; 522b2-second end; 522c-limiting spring; 600-starting position sensor; 700-ending position sensor; 800-dose adjustment mechanism; 900-injection dose sensor; 10 - Injection Dosage View; 20 - Injection Button; 30 - Working Status View; 40 - Syringe Dosage View; 01-Intake port; 02-Connection port; 03-First limiting groove; 04-Second limiting groove. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this application clearer, the application will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0030] The application scenarios described in this application are for the purpose of more clearly illustrating the technical solutions of this application, and do not constitute a limitation on the technical solutions provided in this application. Those skilled in the art will understand that with the emergence of new application scenarios, the technical solutions provided in this application are also applicable to similar technical problems. In the description of this application, unless otherwise stated, "multiple" means two or more.

[0031] Insulin injectors on the market are complex to operate, typically requiring both hands to perform the injection, puncture, and withdrawal. This complexity makes many diabetic patients hesitant to inject insulin. Furthermore, these injectors are primarily designed for abdominal injections; injecting at other sites is inconvenient and the pain is often more pronounced. Repeated injections at the same site can lead to subcutaneous fat hypertrophy and fibrous tissue proliferation. Since insulin is a protein hormone that stimulates fat tissue growth, frequent injections at the same location can cause fatty nodules to form on the skin.

[0032] In view of this, embodiments of this application provide an injection site fixing device for an injection apparatus. Figure 1 This is a schematic diagram of the structure of an injection device including an injection site fixation device according to an embodiment of this application. Figure 2 This is a schematic diagram of the internal structure of an injection device including an injection site fixation device according to an embodiment of this application. Figure 3 This is a schematic diagram of the structure of an injection device with the sealing mechanism in the closed state according to an embodiment of this application. Figure 4 This is a schematic diagram of the injection device with the sealing mechanism in the open state according to one embodiment of this application. Please refer to it as well. Figures 1 to 4 The injection site fixation device 200 includes a negative pressure generating device 210, a sealing mechanism 220, and a suction cup 230. The suction cup 230 includes a negative pressure chamber 232, and the sealing mechanism 220 separates the needle cavity 231 (containing the injection needle 320) from the negative pressure chamber 232. The negative pressure generating device 210 is connected to the negative pressure chamber 232 and generates negative pressure in the chamber, causing the user's injection site to be adhered to the suction cup 230 under the negative pressure within the chamber. The sealing mechanism 220 is configured to switch between an open and closed state. For example... Figure 3 As shown, when the suction cup 230 is not attached to the user's injection site, the sealing mechanism 220 is in the closed state to isolate the negative pressure chamber 232 and the needle chamber 231. Figure 4 As shown, when the suction cup 230 is attached to the user's injection site and the injection needle 320 is activated to insert the needle into the injection site, the sealing mechanism 220 is in the open state so that the negative pressure chamber 232 and the needle chamber 231 are connected.

[0033] When the suction cup 230 is not attached to the user's injection site, the sealing mechanism 220 is closed to isolate the negative pressure chamber 232 and the needle chamber 231. This prevents the negative pressure generated in the negative pressure chamber 232 from acting on the injection needle 320, thus avoiding leakage of the medication from the needle under negative pressure. The negative pressure generating device 210 can generate negative pressure in the negative pressure chamber 232, causing the user's injection site to be attached to the suction cup 230 under the negative pressure within the chamber, thereby fixing the suction cup 230 to the user's injection site. When the suction cup 230 is attached to the user's injection site and the injection needle 320 is activated to insert the needle into the injection site, the sealing mechanism 220 is open to connect the negative pressure chamber 232 and the needle chamber 231, allowing the needle of the injection needle 320 to pierce the skin attached to the negative pressure chamber 232, thereby completing the injection operation. After the injection is completed and the needle is removed, the sealing mechanism 220 closes, once again isolating the chamber of the injection needle 320 from the chamber of the suction cup 230. Throughout the entire injection process, the user cannot see the needle, which helps eliminate the fear of needles and significantly reduces the pain of injection. Moreover, the injection site fixation device 200, by fixing the suction cup 230 to the user's injection site, allows the user to operate with one hand, simplifying the operation. This allows the user to inject into the abdomen and other areas, expanding the range of body sites that can be injected, while avoiding the harm caused by long-term injections in one site.

[0034] In some possible embodiments of this application, the negative pressure generating device 210 may be a negative pressure pump or the like.

[0035] In some possible embodiments of this application, the negative pressure chamber 232 and the needle chamber 231 are connected through a communication port 233. (Continue referring to...) Figure 2 and Figure 3 The sealing mechanism 220 may include a sealing element 221 and a driving mechanism 222. The driving mechanism 222 is pulsatorically connected to the sealing element 221 and is used to drive the sealing element 221 to reciprocate, so that the sealing element 221 approaches and blocks the communication port 233, or moves away from the communication port to open the communication port 233. Optionally, the direction of the reciprocating motion of the sealing element 221 may be radial to the communication port 233.

[0036] Continue to refer to Figure 3 and Figure 4 The sealing element 221 may include a first sealing shell 221a and a second sealing shell 221b, wherein the first sealing shell 221a and the second sealing shell 221b may approach each other until they fit together to block the communication port 233; or, the first sealing shell 221a and the second sealing shell 221b may move away from each other to open the communication port 233.

[0037] It is understood that the edges of the first sealing shell 221a and / or the second sealing shell 221b are provided with sealing rings to ensure that the first sealing shell 221a and the second sealing shell 221b are in sealed contact when they are fitted together, thereby isolating the negative pressure chamber 232 and the needle chamber 231.

[0038] To ensure that the sealing mechanism 220 is in the open state when the injection needle 320 is inserted and injected, and in the closed state after the injection needle 320 retracts into the needle tip chamber 231, the driving mechanism 222 in this application may include a drug core holder 222a and an elastic element. The drug core holder 222a is used to support the syringe 310 and can move with the syringe 310 to approach or move away from the user's injection site. The elastic element is connected to the sealing element 221, and the end of the drug core holder 222a near the negative pressure chamber 232 abuts against the sealing element 221. When the suction cup 230 adheres to the user's injection site and pushes the syringe 310 to insert the needle, the drug core holder 222a moves closer to the injection site along with the syringe 310. Under the pressure of the drug core holder 222a, the seal 221 moves away from the communication port and compresses the elastic element, putting the sealing mechanism 220 in the open state, so that the negative pressure chamber 232 and the needle chamber 231 are connected, allowing the needle of the injection needle 320 to pierce the skin adhered to the negative pressure chamber 232, thereby completing the injection operation. After the injection is completed and the needle is withdrawn, the drug core holder 222a moves away from the injection site along with the syringe 310, and the seal 221 returns to its initial state under the drive of the elastic element, that is, the sealing mechanism 220 closes, and the negative pressure chamber 232 and the needle chamber 231 are separated again.

[0039] For example, when the seal 221 includes a first sealing shell 221a and a second sealing shell 221b, the drive mechanism 222 may include at least two elastic elements, wherein at least one elastic element is connected to the side of the first sealing shell 221a opposite to the injection needle 320, and the other elastic element is connected to the side of the second sealing shell 221b opposite to the injection needle 320. The end of the drug core holder 222a abuts against the surfaces of the first sealing shell 221a and the second sealing shell 221b opposite to the elastic elements, respectively. When the suction cup 230 is attached to the user's injection site and pushes the syringe 310 to insert the needle into the injection site, the drug core holder 222a moves closer to the injection site along with the syringe 310. Under the action of the drug core holder 222a, the first sealing shell 221a and the second sealing shell 221b can move away from each other to open the communication port 233. After the injection is completed and the needle is withdrawn, the drug core holder 222a moves away from the injection site along with the syringe 310. Driven by the elastic element, the first sealing shell 221a and the second sealing shell 221b move closer to each other until they fit together to seal the communication port 233.

[0040] It is understood that the drive mechanism 222 can be the drive mechanism 222 that includes the drug core holder 222a and the elastic element, or it can be a drive mechanism 222 alone. The drive mechanism 222 includes, but is not limited to, electric drive mechanisms and pneumatic drive mechanisms. For example, motors, electromagnets, linear motors, air pumps, cylinders, etc., as long as they can drive the sealing mechanism 220 to open to connect the negative pressure chamber 232 and the needle chamber 231, or drive the sealing mechanism 220 to close to isolate the negative pressure chamber 232 and the needle chamber 231.

[0041] When the drive mechanism 222 includes a drug core holder 222a and an elastic element, the opening and closing of the sealing mechanism 220 can be linked to the needle insertion and needle withdrawal of the syringe 310, respectively.

[0042] Figure 5 This is a schematic diagram of the suction cup structure according to one embodiment of this application. Figure 6 This is a schematic diagram of the suction cup structure according to one embodiment of this application. Figure 7 This is a cross-sectional view of a suction cup according to one embodiment of this application; please refer to it as well. Figures 5 to 7 The suction cup 230 includes a first sealing part 230a and a second sealing part 230b arranged coaxially. The first sealing part 230a is located at the outer edge of the second sealing part 230b. The first sealing part 230a is used to seal in contact with the user's skin. Both the first sealing part 230a and the second sealing part 230b are annular structures and surround to form a negative pressure cavity 232. The height of the second sealing part 230b relative to the skin surface is higher than the height of the first sealing part 230a relative to the skin surface.

[0043] The second sealing part 230b has an opening in the central area, which is the communication port 233. The skin of the user's injection site faces the communication port 133 and bulges towards the needle cavity 231 under negative pressure to facilitate needle insertion and injection.

[0044] In some possible embodiments of this application, the injection site fixation device 200 includes an air guide tube 240, which includes an air inlet 01 and a connection port 02. The air inlet 01 communicates with the negative pressure chamber 232, and the connection port 02 communicates with the negative pressure generating device 210. The height of the air inlet 01 relative to the skin surface is higher than the height of the second sealing part 230b relative to the skin surface, so that at least a portion of the chamber of the negative pressure chamber 232 communicating with the air inlet 01 forms a negative pressure suction channel 2321. This channel is used to prevent the skin at the user's injection site from bulging and blocking the air inlet 01 under the action of negative pressure when the first sealing part 230a and the second sealing part 230b are sealed with the skin surface. This ensures that the negative pressure suction channel 2321 maintains a negative pressure state under the action of the negative pressure generating device 210 and continuously generates the required negative pressure suction force, so that the first sealing part 230a and the second sealing part 230b always remain sealed with the skin.

[0045] In some possible embodiments, reference continues to be made to Figures 5 to 7 The first sealing part 230a and the second sealing part 230b are connected by a connecting part 230c. The height of the connecting part 230c relative to the skin surface is higher than the height of the second sealing part 230b relative to the skin surface. The air inlet 01 is located in the connecting part 230c or the air guide tube 240 passes through the connecting part 230c and communicates with the negative pressure chamber 232.

[0046] It is understandable that the air delivery tube 240 may be partially located inside the negative pressure chamber 232, or the entire air delivery tube 240 may be located outside the negative pressure chamber 232, depending on the actual needs.

[0047] When the skin at the injection site comes into contact with the first sealing part 230a of the suction cup 230, the skin at the injection site bulges under negative pressure. Once the skin has bulged to a certain height, at least a portion of the second sealing part 230b adheres to the skin, sealing it and separating the suction port 01 from the needle cavity 231. This allows the skin at the injection site to protrude through the opening of the second sealing part 230b, ready for the next stage of needle insertion and injection. After the skin at the injection site is properly sealed with the first sealing part 230a and the second sealing part 230b of the suction cup 230, the negative pressure suction channel 2321 remains connected to the negative pressure generating device 210. Under the action of the negative pressure generating device 210, a continuous negative pressure suction is generated within the negative pressure chamber 232, ensuring that the first sealing part 230a and the second sealing part 230b remain sealed to the periphery and center of the skin at the injection site, respectively. When the sealing mechanism 220 of the injection site fixing device 200 is opened, and the negative pressure chamber 232 and the needle chamber 231 are connected, the negative pressure suction channel 2321 is isolated from the needle chamber 231 by the sealing action between the second sealing part 230b in the suction cup 230 and the skin of the injection site, ensuring that the injection needle 320 will not be subjected to negative pressure, causing the medicine to leak out from the needle.

[0048] In some possible embodiments of this application, the injection site fixation device 200 further includes a pressure sensor 250 for monitoring the pressure within the suction cup 230.

[0049] In some possible embodiments of this application, the injection device further includes a control module. The control module is signal-connected to the negative pressure generator 210 and the pressure sensor 250. The pressure sensor 250 transmits the pressure value to the control module, and the control module can control the working state of the negative pressure generator 210 according to the magnitude of the pressure value.

[0050] The structure of the injection site fixation device 200 has been described above. The working process of the injection site fixation device 200 will be explained in detail below.

[0051] The negative pressure chamber 232 is aligned with the user's injection site. The negative pressure generating device 210 evacuates the negative pressure chamber 232 through the air guide tube 240, creating a negative pressure within it. Under this negative pressure, the skin at the injection site is drawn into the negative pressure chamber 232, forming a sealed space and securing the skin within it. Simultaneously, a pressure sensor 250 monitors the pressure value within the negative pressure chamber 232 and transmits it to the control module. The control module adjusts the operating state of the negative pressure generating device 210 based on the pressure value to stabilize the pressure within the negative pressure chamber 232 within a set range. After injection, the control module stops pressurizing the negative pressure generating device 210 and releases the pressure within the negative pressure chamber 232, causing it to detach from the injection site.

[0052] It is understandable that the negative pressure chamber 232 and the needle chamber 231 are separated by a sealing mechanism to ensure that when the injection site is fixed before injection, the negative pressure generated by the negative pressure generating device 210 in the negative pressure chamber 232 will not act on the needle in the needle chamber 231. Otherwise, the medicine will leak out from the needle, resulting in waste of medicine and deviation of injection dosage.

[0053] Based on the same technical concept, this application also provides an injection device. Figure 8 This is a schematic diagram of the structure of an injection device according to an embodiment of this application. Figure 9 This is an exploded view of an injection device according to an embodiment of this application. Please refer to... Figure 8 and Figure 9 The injection device includes a housing 110, a syringe 310, and an injection site fixing device 200 in various possible embodiments of the present application. The suction cup 230 is detachably connected to the housing 110. The syringe 310 is installed inside the housing 110, and an injection needle 320 is provided at the end of the syringe 310 near the suction cup 230.

[0054] The injection device also includes a drug delivery component 330 and a linkage device disposed within the housing 110. The injection device can switch between at least a manual injection mode and an automatic injection mode. In manual injection mode, the user can manually perform needle insertion and injection. In automatic injection mode, the device can automatically perform skin fixation, needle insertion, and injection, and can be used to inject into the user's abdomen and other areas.

[0055] Optionally, the injection device also includes a needle cap 120 and an injection cap 130. The main unit includes a dose adjustment mechanism 800, an injection dose window 10, a working status window 30, an injection button 20, a syringe dosage window 40, and an injection needle 320. The dose adjustment mechanism 800 is used to set the injection dose, and the set dose can be displayed in the injection dose window 10. Optionally, the dose adjustment mechanism 800 can be a dose adjustment knob, etc. The injection button 20 is used to activate the automatic injection mode of the injection device. After activation, the injection device can automatically complete the operations of fixing the injection site, inserting the needle, injecting, and removing the needle.

[0056] The working status window 30 is used to display the working status of the injection device in automatic injection mode. Optionally, the working status window 30 in this application may include a dose adjustment status light, an injection site fixation status light, and a drug injection status light. The dose adjustment status light indicates whether the drug dosage adjustment is complete; green indicates complete adjustment, red indicates incomplete adjustment, and an audible alert is given. The injection device can only perform the injection site fixation operation after the dose adjustment is completed. The injection site fixation status light indicates whether the skin at the injection site is properly fixed; green indicates proper fixation, red indicates incomplete fixation, and an audible alert is given. The injection device can only proceed to the next injection operation after the skin at the injection site is properly fixed. The drug injection status light indicates whether the drug injection has been successfully completed; green indicates successful completion of the set dosage, red indicates unsuccessful completion, and an audible alert is given. Insufficient remaining dosage, needle blockage of the injection needle 320, or malfunction of the injection device may all lead to unsuccessful injection.

[0057] It should be noted that the dose adjustment status light, injection site fixation status light, and drug injection status light only start working after automatic injection is started, in order to indicate to the user whether the corresponding operation steps during automatic injection have been successfully completed.

[0058] In addition, the main unit can be equipped with an indicator light to display the remaining battery power. When the battery power is below a first threshold, the indicator light turns yellow, prompting the user to charge the injection device in time, but automatic injection can still be completed at this time. When the battery power is below a second threshold, the indicator light turns red and flashes, indicating that the remaining battery power is too low and automatic injection cannot be started. The first threshold is greater than the second threshold.

[0059] The needle cap 120 is used to house the needle of the injection needle 320. When the needle cap 120 is opened, the syringe and needle inside the housing 110 can be replaced. During the injection process, the needle is hidden in the needle cap 120, and the user cannot see the needle, thereby eliminating the user's fear of the needle and significantly reducing the user's pain from injection.

[0060] When the needle cap 120 is removed, the injection device can operate in manual injection mode. That is, the housing 110 of the injection device functions similarly to a traditional mechanical syringe. First, the syringe and needle are loaded, air bubbles are removed from the syringe, and then the dosage adjustment knob is turned to set the injection dose. In manual injection mode, the needle cap 120 prevents needle bending due to improper manual insertion.

[0061] The automatic injection mode is only effective after the needle cap 120 is installed. In automatic injection mode, you must first complete the following steps: install the syringe and injection needle 320, remove air bubbles from the syringe, and adjust the injection dose. Only after pressing the injection button 20 will the injection site be fixed and the needle injection be initiated. Otherwise, pressing the injection button 20 will not be effective and automatic injection will not be initiated to avoid invalid needle puncture and injection operations when the injection device is not ready.

[0062] In some embodiments of this application, one end of the needle cap 120 is detachably connected to the housing 110. The connection between the needle cap 120 and the housing 110 can be a threaded connection or a snap-fit ​​connection, as long as it allows for disassembly and replacement without tools.

[0063] It is understandable that part of the injection needle 320 is located inside the housing 110 and another part is located inside the needle cap 120. Therefore, both the housing 110 and the needle cap 120 are provided with a graduated transparent window, namely the syringe dosage window 40, for observing the remaining dosage in the syringe and replacing the syringe in time when the dosage is insufficient.

[0064] In some possible embodiments of this application, the housing 110 is provided with an electrical interface. The electrical interface can be used as a power interface for charging the injection device. Furthermore, the electrical interface can also serve as a data interface for connecting the injection device to other devices to enable data communication between them.

[0065] The end of the needle cap 120 furthest from the housing 110 is detachably connected to the needle cavity 231. The suction cup 230 is a frequently replaced consumable and needs to be easy to disassemble and assemble. Therefore, in this application, the suction cup 230 and the needle cap 120 are detachably connected by means of threaded connection or snap-fit ​​connection, so as to facilitate the disassembly and replacement of the suction cup 230.

[0066] The injection cap 130 is located at the end of the injection device. The injection cap 130 houses the suction cup 230 and is detachably connected to the needle cavity 231. Opening the injection cap 130 exposes the suction cup 230. After adjusting the injection dosage, the suction cup 230 is aligned with the user's injection site. Once the suction cup 230 adheres to the injection site, the automatic injection process can be initiated. After injection, the needle cap 120 is opened and the needle is removed. The needle cap 120 and injection cap 130 are then closed to seal the suction cup 230 and syringe, preventing contamination from the external environment.

[0067] Figure 10 This is a schematic diagram of the internal structure of an injection device according to an embodiment of this application, with reference to... Figure 10 The injection device includes a syringe 310, a drug delivery assembly 330, and a linkage mechanism. The syringe 310 is installed within a housing 110, and an injection needle 320 is provided at the end of the syringe 310 near the suction cup 230. The drug delivery assembly 330 includes a syringe barrel and a piston rod 331 connected to the syringe barrel, and the syringe barrel contains a drug solution. For example, the drug solution may be insulin or other drugs. The linkage mechanism is connected to both the syringe 310 and the piston rod 331. The injection device is configured to switch between at least a manual injection mode and an automatic injection mode. In the manual injection mode, the suction cup 230 is separated from the housing 110, allowing the user to manually insert the syringe 310 and perform the injection. In the automatic injection mode, the suction cup 230 is connected to the housing 110, and the suction cup 230 adheres to the injection site, enabling the linkage mechanism to automatically drive the syringe 310 to perform the insertion and to automatically drive the piston rod 331 to perform the injection.

[0068] In some embodiments of this application, the linkage device includes a drive assembly 500 and an injection plunger 420. The dose adjustment mechanism 800 is connected to the injection plunger 420, the injection plunger 420 is connected to the piston rod 331, and the injection plunger 420 can slide along the height direction of the syringe 310.

[0069] The drive assembly 500 includes a drive unit 510 and a clutch mechanism 520. The clutch mechanism 520 is connected to the syringe 310. When the clutch mechanism 520 is closed or open, the syringe 310 and the drive unit 510 are in a coupled or decoupled state. When the clutch mechanism 520 is closed, the syringe 310 and the drive unit 510 are in a coupled state, and the drive unit 510 drives the syringe 310 from its initial position toward the injection site closer to the user, causing the injection needle 320 to penetrate the injection site. When the clutch mechanism 520 is open, the syringe 310 and the drive unit 510 are in a decoupled state. After the drive unit 510 is connected to the injection plunger 420, the drive unit 510 drives the injection plunger 420 toward the bottom of the syringe to squeeze the medication and inject it into the user's body. When the clutch mechanism 520 is closed again, the syringe 310 and the drive unit 510 are coupled again. The drive unit 510 drives the syringe 310 to move away from the injection site to remove the injection needle 320 from the injection site and return it to the initial position.

[0070] The aforementioned injection device can automatically complete the needle insertion, injection, and needle removal operations, allowing users to operate it with one hand. This reduces the steps and difficulty of operation, enabling users to inject into body parts other than the abdomen, avoiding the harm caused by long-term injections at one site. Furthermore, the injection device in this application uses only one drive component 500 to achieve the linkage between needle insertion and drug injection, driven by a single motor. Its ingenious structural design and simple operation make it easy to use. Moreover, the automatic injection mode includes the following steps: dosage adjustment, injection site fixation, needle insertion, and drug injection. The next step cannot be initiated until the previous step is successfully completed, avoiding invalid operations and thus improving the safety and lifespan of the injection device.

[0071] In some embodiments of this application, the clutch mechanism 520 includes a first clutch 521, the drive unit 510 includes a first drive member 511a and a transmission assembly, the transmission assembly is connected to the output end of the first drive member 511a, and the first clutch 521 is disposed on the syringe 310.

[0072] When the first clutch 521 is closed, the transmission assembly and the syringe 310 are coupled. The first drive member 511a drives the syringe 310 to move from its initial position toward the injection site closer to the user through the transmission assembly, and causes the injection needle 320 to be inserted into the injection site. After the needle tip of the injection needle 320 penetrates the subcutaneous tissue to a predetermined depth, the injection action is completed.

[0073] After the needle insertion is completed, the injection phase begins. At this time, the first clutch 521 is disengaged, and the transmission assembly and syringe 310 are decoupled. The first drive unit 511a drives the transmission assembly to continue approaching the injection site until the transmission assembly abuts against the injection plunger 420. The drive unit 510 then drives the injection plunger 420 to move towards the bottom of the syringe to squeeze the medication and inject it into the user's body. Once the set dose of medication has been injected, the injection is complete.

[0074] After the injection is completed, the first clutch 521 closes again, and the transmission assembly and the syringe 310 are coupled again. The drive unit 510 drives the syringe 310 to move away from the injection site to remove the injection needle 320 from the injection site and return it to the initial position.

[0075] The first clutch 521 may be an electronic clutch. Electronic clutches include, but are not limited to, clutches driven by electromagnets or motors.

[0076] In some embodiments of this application, such as Figure 6 As shown, the transmission assembly includes a lead screw 512a and a nut 512b sleeved on the lead screw 512a. The lead screw 512a is connected to the output end of the first drive member 511a, and the first clutch 521 is provided on the syringe 310.

[0077] When the first clutch 521 is closed, the lead screw 512a is coupled with the syringe 310. The first drive member 511a drives the syringe 310 to move from its initial position toward the injection site closer to the user through the lead screw nut assembly 512, and causes the injection needle 320 to be inserted into the injection site. After the needle tip of the injection needle 320 penetrates the subcutaneous tissue to a predetermined depth, the injection action is completed.

[0078] After the needle insertion is completed, the injection stage begins. At this time, the first clutch 521 is opened, and the lead screw 512a and the syringe 310 are decoupled. The first drive unit 511a drives the lead screw 512a to move the nut 512b closer to the injection site until the nut 512b abuts against the injection push rod 420. The drive unit 510 then drives the injection push rod 420 to move towards the bottom of the syringe to squeeze the liquid and inject it into the user's body.

[0079] After the injection is completed, the first clutch 521 closes again, the lead screw 512a and the syringe 310 are coupled again, and the drive unit 510 drives the syringe 310 to move away from the injection site, so as to remove the injection needle 320 from the injection site and return it to the initial position.

[0080] Figure 11 This is a schematic diagram of the internal structure of an injection device according to an embodiment of this application, with reference to... Figure 11The injection plunger 420 is provided with a protrusion 421. When the first driving member 511a drives the lead screw 512a to move the nut 512b close to the injection site until the nut 512b abuts against the protrusion 421, the first driving member 511a can drive the injection plunger 420 to move towards the bottom of the syringe to squeeze the medicine and inject it into the user's body.

[0081] In some embodiments of this application, the housing 110 is further provided with an automatic reset mechanism connected to the injection push rod 420. When the first driving member 511a drives the lead screw 512a to move the nut 512b away from the injection site, after the nut 512b separates from the protrusion 421, the automatic reset mechanism can drive the injection push rod 420 to move away from the injection site until it is reset.

[0082] Optionally, the automatic reset mechanism may be a reset spring, etc.

[0083] In other possible embodiments of this application, Figure 12 This is a schematic diagram of the injection device with the syringe in its initial position according to another embodiment of this application, referring to... Figure 12 The linkage device also includes a needle push rod 430, a clutch mechanism 520 including a second clutch 522, a drive unit 510 including a second drive member 511b and a transmission assembly, the transmission assembly being connected to the output end of the second drive member 511b, the needle push rod 430 being fixedly connected to the transmission assembly, and the second clutch 522 being mounted on the syringe 310.

[0084] When the user presses the injection button 20 to activate the automatic injection mode, such as Figure 8 As shown, the second clutch 522 is in the closed state, and the transmission assembly is coupled to the syringe 310 via the needle push rod 430. The second drive member 511b drives the syringe from its initial position toward the injection site closer to the user via the transmission assembly, and causes the injection needle 320 to penetrate the injection site. Figure 13 This is a schematic diagram of the injection device during the completion of needle insertion according to another embodiment of this application, as shown below. Figure 13 As shown, after the syringe 310 moves a certain distance, the needle tip of the injection needle 320 penetrates the subcutaneous tissue to the predetermined depth, and the injection action is completed.

[0085] After the needle insertion is completed, the injection stage begins. At this time, the second clutch 522 is opened, and the transmission component and the syringe 310 are decoupled. The second drive component 511b continues to drive the transmission component to rotate in the first direction until the transmission component is connected to the injection push rod 420, thereby driving the injection push rod 420 to move towards the bottom of the syringe to squeeze the liquid and inject it into the user's body. Figure 14 This is a schematic diagram of the injection device with the syringe in the terminated position according to another embodiment of this application, referring to... Figure 14 Once the prescribed dose of medication has been injected, the injection is complete.

[0086] After injection, the drive unit 510 drives the transmission assembly to rotate in the second direction, the injection push rod 420 remains stationary, and the needle push rod 430 moves away from the injection site under the drive of the transmission assembly. After moving a certain distance, the second clutch 522 closes again, and the transmission assembly is coupled with the syringe 310 again through the needle push rod 430. The drive unit 510 drives the syringe 310 to move away from the injection site to remove the injection needle 320 from the injection site and return it to the initial position, thereby completing the reset operation of the injection device.

[0087] In this case, the first direction and the second direction are opposite. For example, if the first direction is clockwise, then the second direction is counterclockwise. Conversely, if the first direction is counterclockwise, then the second direction is clockwise.

[0088] In some possible embodiments of this application, the second clutch 522 is selected from an electronic clutch or a mechanical clutch.

[0089] The transmission assembly may include a lead screw 512a and a nut 512b sleeved on the lead screw 512a. The lead screw 512a is connected to the output end of the second drive member 511b, and the needle push rod 430 is fixedly connected to the nut 512b.

[0090] like Figure 12 As shown, when the second clutch 522 is in the closed state, the lead screw 512a is coupled to the syringe 310 via the needle insertion rod 430. The second drive member 511b drives the lead screw 512a to rotate in the first direction. Under the action of the nut 512b on the lead screw 512a, the needle insertion rod 430 drives the syringe to move from its initial position toward the injection site closer to the user, and causes the injection needle 320 to penetrate the injection site. Figure 9 As shown, after the syringe 310 moves a certain distance, the needle tip of the injection needle 320 penetrates the subcutaneous tissue to the predetermined depth, and the injection action is completed.

[0091] After the injection is completed, the injection phase begins. At this time, the second clutch 522 is disengaged, and the lead screw 512a and syringe 310 are decoupled. The second drive unit 511b continues to drive the lead screw 512a to rotate in the first direction. The injection push rod 430 continues to move forward under the push of the nut 512b on the lead screw 512a, while the syringe 310 no longer moves forward. When the nut 512b presses against the protrusion 421 on the injection push rod 420, the lead screw 512a is connected to the injection push rod 420 through the nut 512b, thereby driving the injection push rod 420 to move towards the bottom of the syringe to squeeze the liquid and inject it into the user's body. Figure 10As shown, the injection is complete after the set dose of medication has been injected.

[0092] After injection, the drive unit 510 drives the lead screw 512a to rotate in the second direction, the injection push rod 420 remains stationary, and the needle push rod 430 moves away from the injection site under the action of the nut 512b on the lead screw 512a. After moving a certain distance, the second clutch 522 closes again, and the lead screw 512a is coupled to the syringe 310 again through the needle push rod 430. The drive unit 510 drives the syringe 310 to move away from the injection site to remove the injection needle 320 from the injection site and return it to the initial position, thereby completing the reset operation of the injection device.

[0093] It is understandable that the transmission components include, but are not limited to, the lead screw and nut assembly, as long as they can transmit the power of the drive unit to the syringe.

[0094] In some possible embodiments of this application, the first driving member 511a and the second driving member 511b can both be a motor, a cylinder, or an electric cylinder, etc.

[0095] Among them, the drive unit 510, the first clutch 521, and the second clutch 522 are all connected to the control module via signals.

[0096] In some possible embodiments of this application, the injection device further includes an injection dose sensor 900, which is used to detect the actual dose of medication injected into the user's body. Specifically, the injection dose sensor 900 may be an injection dose counter. The working principle of the injection dose counter is to monitor the angle of rotation of the lead screw 512a, thereby obtaining the number of rotations of the lead screw 512a, and then calculating the dose of medication injected each time.

[0097] The injection dose sensor 900 is connected to the control module via signal. The injection dose sensor 900 transmits information such as the dose and time of each injection to the control module, which can record the above information.

[0098] The control module may include a display screen for displaying the injection dose for user viewing.

[0099] Figure 15 This is a schematic diagram of the internal structure of the injection device according to another embodiment of this application. Figure 16 This is a schematic diagram of the internal structure of the injection device according to another embodiment of this application, with reference to... Figure 15 and Figure 16The housing 110 contains a first bracket 111, and the second clutch 522 includes a support seat 522a and a positioning pin 522b. The support seat 522a is fixed to the syringe 310 and has a through hole, through which the positioning pin 522b passes. Along the axial direction of the through hole, the positioning pin 522b includes a first end 522b1 and a second end 522b2. The needle push rod 430 has a first limiting groove 03 on its surface facing the first end 522b1, and the first bracket 111 has a second limiting groove 04 on its surface facing the second end 522b2.

[0100] When the first end 522b1 is inserted into the first limiting groove 03, the second end 522b2 abuts against the surface of the first bracket 111, the second clutch 522 is in the closed state, and the needle push rod 430 and the syringe 310 are coupled so that the syringe 310 and the lead screw 512a are indirectly coupled.

[0101] When the second end 522b2 is inserted into the second limiting groove 04, the first end 522b1 moves out of the first limiting groove 03, the second clutch 522 is in the open state, the needle push rod 430 and the syringe 310 are decoupled, so that the syringe 310 and the lead screw 512a are in the decoupled state.

[0102] In some possible embodiments of this application, the second clutch 522 further includes a limiting spring 522c, which is sleeved on the positioning pin 522b. One end of the limiting spring 522c abuts against the limiting ring on the positioning pin 522b, and the other end of the limiting spring 522c abuts against the drive ring on the needle push rod 430.

[0103] Continue to refer to Figure 15 The injection device also includes a termination position sensor 700, located in the lower part of the housing 110. The termination position sensor 700 detects whether the end of the injection plunger 420 near the injection needle 320 has reached a preset position. The preset position is the position of the end of the injection plunger 420 near the injection needle 320 when the injection plunger 420 injects a preset dose of medication into the user's body. When the syringe 310 triggers the termination position sensor 700, the lead screw 512a stops rotating, indicating that the injection is complete.

[0104] In some possible embodiments of this application, the stop position sensor 700 may be a stop switch.

[0105] Optionally, the termination position sensor 700 can also be used to detect whether the user has completed the dosage adjustment of the medication. When automatic injection is started, if the termination position sensor 700 is still in the triggered state, such as when the stop switch is in the closed state, it means that the user has not yet set the injection dose, and automatic injection cannot be started. Conversely, when the stop switch is in the open state, it means that the user has set the injection dose, and automatic injection can be started.

[0106] Figure 17 This is a partial structural schematic diagram of an injection device according to an embodiment of this application, with reference to... Figure 17 The injection device also includes a starting position sensor 600, which is located at the top inside the housing 110. The starting position sensor 600 is used to detect whether the syringe 310 is in the initial position. If the syringe 310 returns to the initial position, the starting position sensor 600 will be triggered. At this time, the lead screw 512a will stop rotating, and the syringe 310 will be reset.

[0107] In some possible embodiments of this application, the starting position sensor 600 may be a position sensor such as an optocoupler.

[0108] The starting position sensor 600 and the ending position sensor 700 are both connected to the control module signal.

[0109] In some possible embodiments of this application, the injection device further includes a torque sensor. The torque sensor is used to detect the torque of the lead screw 512a rotating. If the torque detected by the drive unit 510 driving the lead screw 512a to rotate exceeds a set threshold, and the termination position sensor 700 is still not triggered, it indicates that the injection has failed. The reason for the injection failure may be insufficient syringe dosage or needle blockage, which prevents the injection of the set dosage from being completed.

[0110] The structure and function of the injection device in this application have been described above. The operation steps of the injection device will be explained below. The operation steps for automatic injection using this injection device are as follows: 1) Install the syringe and needle: Open the needle cap 120, unscrew the syringe holder, insert the syringe into the syringe holder, reinstall the syringe holder into the injection device, and then install the needle. If the injection device already contains a syringe and there is enough remaining medication, there is no need to replace the syringe; simply install the needle. After removing any air bubbles from the syringe, replace the needle cap 120.

[0111] 2) Set the injection dose: Manually adjust the dose adjustment knob of the injection device to set the desired injection dose.

[0112] 3) Injection Site Fixation: Open the injection cap 130, place the suction cup 230 on the injection site, and press the injection button 20. After receiving the injection command, the injection device first checks whether the dosage adjustment is complete. If the control module detects that the dosage adjustment knob is still in the zero position, it will not activate the injection site fixation and will prompt the user to adjust the injection dosage through the status indicator light. If the injection device detects that the dosage adjustment is complete, it will activate the negative pressure generator 210 to make the suction cup 230 adhere to the injection site under negative pressure. When the control module detects through the pressure sensor 250 that the pressure inside the suction cup 230 has reached the injection requirements, it will stop pressurizing and maintain the pressure applied to the injection site inside the suction cup 230 at a basically constant level.

[0113] 4) After the injection site is fixed, the control module controls the drive component 500 to start working. The drive unit 510 pushes the injection needle 320 of the syringe 310 to quickly pierce the subcutaneous tissue and then injects the set dose of medicine into the user's subcutaneous tissue.

[0114] 5) After injection, the injection needle 320 remains in the subcutaneous tissue for a few seconds. Then, the pressure applied to the injection site is released. The drive unit 510 drives the syringe 310 and the injection plunger 420 to move away from the injection site, removing the injection needle 320 from the injection site and returning it to its initial position. The negative pressure chamber 232 is then separated from the injection site. The injection cap 130 is closed, and the needle cap 120 is opened. The needle is unscrewed and disposed of in the waste collection box. The needle cap 120 is then replaced, and the injection device is stored for future use.

[0115] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. An injection site fixing device for an injection apparatus, characterized in that, The injection site fixation device includes a negative pressure generating device, a sealing mechanism, and a suction cup; the suction cup includes a negative pressure chamber, and the sealing mechanism is used to isolate the needle tip chamber containing the injection needle from the negative pressure chamber; the negative pressure generating device is connected to the negative pressure chamber, and the negative pressure generating device is used to generate negative pressure in the negative pressure chamber so that the user's injection site is adsorbed into the suction cup under the negative pressure in the negative pressure chamber; The sealing mechanism is configured to switch between an open state and a closed state, wherein when the suction cup is not attached to the user's injection site, the sealing mechanism is in a closed state to isolate the negative pressure chamber and the needle chamber; When the suction cup adheres to the user's injection site and the injection needle is activated to insert the needle into the injection site, the sealing mechanism is in the open state, so that the negative pressure chamber and the needle chamber are connected.

2. The injection site fixation device according to claim 1, characterized in that, The negative pressure chamber and the needle chamber are connected through a communication port. The sealing mechanism includes a sealing element and a driving mechanism. The driving mechanism is connected to the sealing element in a transmission manner. The driving mechanism is used to drive the sealing element to reciprocate so that the sealing element moves closer to and blocks the communication port, or the sealing element moves away from the communication port to open the communication port.

3. The injection site fixation device according to claim 2, characterized in that, The driving mechanism includes a drug core support and an elastic element. The drug core support is used to carry the syringe and move with the syringe. The end of the drug core support near the negative pressure chamber abuts against the sealing element, and the elastic element is connected to the sealing element. When the syringe is inserted into the injection site, the drug core support moves close to the injection site, and the seal moves away from the communication port and compresses the elastic member under the pressure of the drug core support, so as to open the sealing mechanism. After injection, the drug core holder moves away from the injection site, and the seal returns to its initial state under the drive of the elastic element, thereby closing the sealing mechanism.

4. The injection site fixation device according to claim 2, characterized in that, The sealing mechanism can also be opened or closed by a motor, electromagnet, air pump, or cylinder.

5. The injection site fixation device according to any one of claims 1-4, characterized in that, The suction cup includes a first sealing part and a second sealing part arranged coaxially. The first sealing part is located at the outer edge of the second sealing part. The first sealing part is used to seal in contact with the user's skin. Both the first sealing part and the second sealing part are annular structures and surround to form the negative pressure cavity. The height of the second sealing part relative to the skin surface is higher than the height of the first sealing part relative to the skin surface.

6. The injection site fixation device according to claim 5, characterized in that, The injection site fixation device further includes an air guide tube, which includes an air inlet and a connection port. The air inlet is connected to the negative pressure chamber, and the connection port is connected to the negative pressure generating device. The height of the air inlet relative to the skin surface is higher than the height of the second sealing part relative to the skin surface, so that at least a portion of the chamber of the negative pressure cavity communicating with the air inlet forms a negative pressure suction channel, which is used to maintain a negative pressure state in the negative pressure suction channel under the action of the negative pressure generating device when the first sealing part and the second sealing part are sealed with the skin surface.

7. An injection linkage device, characterized in that, The device includes a housing, a syringe, and an injection site fixation device as described in any one of claims 1-6, wherein the suction cup is detachably connected to the housing, the syringe is installed inside the housing, and the end of the syringe near the suction cup is provided with an injection needle.

8. The injection linkage device according to claim 7, characterized in that, It includes a drug delivery component and a linkage device; wherein, the drug delivery component includes a syringe and a piston rod connected to the syringe, and the syringe contains a drug solution; The linkage device is connected to both the syringe and the piston rod, and the injection device is configured to switch between at least a manual injection mode and an automatic injection mode; wherein... When the injection device is in manual injection mode, the suction cup and the housing separate, allowing the user to manually perform needle insertion and injection. When the injection device is in automatic injection mode, the suction cup is connected to the housing, and the suction cup is attached to the injection site, so that the linkage device can drive the syringe to automatically complete the needle insertion and drive the piston rod to automatically complete the injection.

9. The injection linkage device according to claim 8, characterized in that, The linkage device includes a drive assembly and an injection plunger. The injection plunger is connected to the piston rod and can slide along the height direction of the syringe. The drive assembly includes a drive unit and a clutch mechanism. The clutch mechanism is connected to the syringe. When the clutch mechanism is closed or open, the syringe and the drive unit are in a coupled or decoupled state. When the clutch mechanism is closed, the syringe and the drive unit are in a coupled state. The drive unit drives the syringe to move from its initial position toward the injection site closer to the user, and causes the injection needle to penetrate the injection site. When the clutch mechanism is open, the syringe and the drive unit are in a decoupled state. After the drive unit is connected to the injection plunger, the drive unit drives the piston rod to move towards the bottom of the syringe through the injection plunger to inject the medicine into the user's body. When the clutch mechanism is closed again, the syringe and the drive unit are coupled again, and the drive unit drives the syringe to move away from the injection site to remove the injection needle from the injection site and return it to the initial position.

10. The injection linkage device according to claim 9, characterized in that, The clutch mechanism includes a first clutch, the drive unit includes a first drive member and a transmission assembly, the transmission assembly is connected to the output end of the first drive member, and the first clutch is disposed on the syringe; When the first clutch is closed, the transmission assembly is coupled to the syringe. The first drive unit drives the syringe to move from its initial position toward the injection site of the user through the transmission assembly, and causes the injection needle to penetrate the injection site. When the first clutch is disengaged, the transmission assembly is decoupled from the syringe. The first drive unit drives the transmission assembly to continue approaching the injection site until the transmission assembly abuts against the injection plunger. The drive unit then drives the injection plunger to move toward the bottom of the syringe to inject the medication into the user's body. When the first clutch is closed again, the transmission assembly and the syringe are coupled again, and the drive unit drives the syringe to move away from the injection site to remove the injection needle from the injection site and return it to the initial position; The first clutch is an electronic clutch.

11. The injection linkage device according to claim 9 or 10, characterized in that, The injection device further includes a start position sensor and an end position sensor. The start position sensor is located at the top inside the housing and is used to detect whether the syringe is in the initial position. The termination position sensor is located in the lower part of the housing. The termination position sensor is used to detect whether the end of the injection plunger near the injection needle has reached a preset position. The preset position is the position of the end of the injection plunger near the injection needle when the injection plunger injects a preset dose of medicine into the user's body.

12. The injection linkage device according to claim 11, characterized in that, The injection device further includes a dose adjustment mechanism and an injection dose sensor. The dose adjustment mechanism is connected to the injection plunger and is used to adjust the dose of the drug solution in the syringe. The injection dose sensor is used to detect the actual dose of the drug solution injected into the user's body.

13. The injection linkage device according to any one of claims 7-12, characterized in that, The injection site fixation device includes a pressure sensor, which is used to monitor the pressure inside the negative pressure chamber.

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