Delay mechanism and injection device

Abstract

The application relates to a time delay mechanism and an injection device, the time delay mechanism comprising a first component, a second component, a first seal, a damping liquid and a filling fluid; the second component is capable of moving from a first position to a third position via a second position relative to the first component; when the second component is in the first position, a damping chamber is formed to prevent the damping liquid from flowing out; during the movement of the second component from the first position to the second position, the first component and the second component cooperate with the first seal to form a sliding seal structure to prevent the damping liquid from passing through, the damping chamber is compressed and the filling fluid is compressed and / or discharged; during the movement of the second component from the second position to the third position, the damping chamber is communicated with a passage for the damping liquid to flow out, and the damping chamber is compressed to extrude the damping liquid from the damping chamber. The application can prevent the damping liquid from flowing out of the damping chamber before the time delay mechanism is started, thereby ensuring the accuracy of the time delay mechanism.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of injection devices, and in particular to a delay mechanism and an injection device. BACKGROUND

[0002] An injection device is capable of injecting a medicament contained therein through a needle into a patient from an injection site, which generally comprises a housing, a medicament bottle, an activation mechanism and a pushing mechanism, wherein the medicament bottle is mounted in the housing, and the medicament bottle comprises a bottle body, a medicament disposed in the bottle body, a needle at a distal end of the bottle body and a movable piston at a proximal end of the bottle body, the pushing mechanism is used to push the movable piston to inject the medicament in the bottle body through the needle into the patient, and the activation mechanism is used for a user to operate to trigger the pushing action of the pushing mechanism.

[0003] During an actual injection, the injected medicament generally needs a period of time to be completely expelled from the medicament bottle, and the medicament also needs a certain period of time to be dispersed at the injection site, if the needle of the injection device is pulled out from the injection site immediately after the injection is completed, it may cause the medicament not to be completely expelled from the medicament bottle, and / or the medicament to flow out from the injection site, which will cause a part of the medicament not to be completely injected into the patient. Some injection devices may prompt the user to wait for a few seconds before pulling out the needle after the injection is completed, so that the needle can stay at the injection site for a period of time; but the time for pulling out the needle depends on the user, which is not convenient for the user.

[0004] Therefore, some injection devices are provided with a delay mechanism, which cooperates with the pushing mechanism, when the pushing mechanism pushes the movable piston of the medicament bottle to the farthest end, the delay action of the delay mechanism is triggered and a visual / audible / tactile signal is given after a period of time to prompt the user that the needle can be pulled out from the injection site at this time; and some injection devices further comprise a needle return mechanism for automatically removing the needle from the injection site of the patient, which cooperates with the delay mechanism, when the pushing mechanism pushes the movable piston of the medicament bottle to the farthest end, the delay action of the delay mechanism is triggered and the needle return action of the needle return mechanism is triggered after a period of time to automatically remove the needle from the injection site of the patient.

[0005] In the related art, the delay mechanism mainly comprises a movable delay component and a damper for providing resistance to the delay component; wherein the delay component is generally powered by a power spring, the damper cooperates with the delay component to form a damping chamber with a preset channel, and the damping chamber has a high-viscosity liquid therein; the moving delay component gradually compresses the damping chamber and extrudes the high-viscosity liquid out of the damping chamber through the channel, and uses the resistance of the high-viscosity liquid to delay the movement of the delay component to achieve the delay function, but part of the high-viscosity liquid may flow out of the damping chamber through the channel before the delay mechanism is started, which will reduce the total time length of the delay mechanism and affect the accuracy of the delay mechanism. SUMMARY

[0006] One of the purposes of the present application is to provide a time delay mechanism which can avoid the situation that damping liquid flows out of the damping chamber before the time delay mechanism is activated, thereby ensuring the accuracy of the time delay mechanism.

[0007] Another purpose of the present application is to provide an injection device comprising the time delay mechanism provided by one of the purposes above, which can activate the time delay mechanism after the pushing mechanism completes the pushing action, and give a prompt signal after the time delay mechanism completes the time delay action and / or trigger the needle retraction action after the time delay mechanism completes, thereby providing convenience for the user of the injection device.

[0008] One of the purposes of the present application provides a time delay mechanism using the following technical scheme:

[0009] A time delay mechanism comprising a first component, a second component, a first seal, a damping liquid and a filling fluid;

[0010] The first component is sleeved with the second component, and the second component can move from a first position to a third position via a second position relative to the first component;

[0011] When the second component is in the first position, the first component, the second component and the first seal cooperate to form a damping chamber which prevents the damping liquid from flowing out, and the damping liquid and the filling fluid are contained in the damping chamber;

[0012] During the movement of the second component from the first position to the second position, the first component and the second component form a sliding seal structure which prevents the damping liquid from passing through by cooperating with the first seal, and the damping chamber is compressed and compresses and / or discharges the filling fluid;

[0013] During the movement of the second component from the second position to the third position, the damping chamber is connected with a passage for the damping liquid to flow out, and the damping chamber is compressed and extrudes the damping liquid from the damping chamber.

[0014] By adopting the technical scheme, before the time delay mechanism is triggered to start, the damping chamber is in a sealed state of limiting damping liquid outflow, so that the damping liquid outflowing from the damping chamber before the time delay mechanism starts is effectively avoided, the time delay duration is shortened, and the accuracy of the time delay mechanism is ensured; after the time delay mechanism is triggered to start, the first component moves relative to the second component by a distance, the damping chamber is compressed, a passage for the damping liquid outflow of the damping chamber is formed, and the damping chamber is continuously compressed in subsequent movement of the first component, so that the damping liquid is squeezed out of the damping chamber, and the movement of the first component is resisted in the process of the damping liquid being squeezed out, the time for the first component to move to the third position is delayed, and the time delay function of the time delay mechanism is realized.

[0015] Further, the first seal is between the first component and the second component, one of the first component and the second component is stationary relative to the first seal, and the other of the first component and the second component comprises a sealing fitting section and a clearance fitting section; during movement of the second component from the first position to the second position, the first seal cooperates with the sealing fitting section, so that the first component and the second component form the sliding seal structure through the first seal; during movement of the second component from the second position to the third position, the first seal cooperates with the clearance fitting section, so that a gap is formed between the first seal, the first component and the second component to form a passage for the damping liquid outflow of the damping chamber.

[0016] Further, a surface of the clearance fitting section is provided with a flow guide groove, a groove bottom of the flow guide groove has a gap with the first seal to form the passage for the damping liquid outflow of the damping chamber.

[0017] Further, the time delay mechanism further comprises a containing chamber, during movement of the second component from the second position to the third position, the passage for the damping liquid outflow of the damping chamber is communicated with the containing chamber, and the damping liquid can be squeezed to flow from the damping chamber to the containing chamber.

[0018] Further, the time delay mechanism further comprises a second seal, the first component, the second component, the first seal and the second seal cooperate to form the containing chamber; one of the first component and the second component is stationary relative to the second seal and is provided with a groove section, and the other of the first component and the second component slides relative to the second seal and maintains sealing, the groove section is between the first seal and the second seal and constitutes a part of a cavity wall of the containing chamber.

[0019] Further, the groove segments comprise support ribs arranged at intervals, two adjacent support ribs form a groove therebetween, and the support ribs are provided with a through opening for connecting the two adjacent grooves.

[0020] Further, the first component comprises a receiving space having a bottom, the second component extends into the receiving space, and an end of the second component extending into the receiving space and the bottom of the receiving space form part of the damping chamber, respectively.

[0021] Further, the first component comprises a cylinder, a cover and a third sealing member, an opening of the cylinder is covered by the cover to form the receiving space having a bottom, and the cylinder and the cover form a sealing structure for preventing the damping liquid from flowing out through the third sealing member.

[0022] Further, the first component moves from the first position to the third position via the second position by translation relative to the second component, or the first component moves from the first position to the third position via the second position by rotation relative to the second component.

[0023] The second object of the present application provides an injection device using the following technical scheme:

[0024] An injection device, comprising a pushing mechanism and the above-mentioned time-delay mechanism, when the pushing action of the pushing mechanism is completed, triggering the relative movement between the first component and the second component in the time-delay mechanism;

[0025] When the first component moves to the third position relative to the second component, a prompt signal is given, and / or when the first component moves to the third position relative to the second component, a needle retraction action is triggered

[0026] By using the above technical scheme, the injection device can start the time-delay mechanism after the pushing action of the pushing mechanism is completed, and give a prompt signal after the time-delay action of the time-delay mechanism is completed, so that the user can pull out the needle based on the signal, or trigger the needle retraction action after the time-delay mechanism is completed, thereby providing convenience for the user of the injection device.

[0027] In summary, the present application at least includes the following beneficial effects:

[0028] Before the time delay mechanism is triggered to start, the damping chamber is in a sealed state to limit the outflow of damping liquid, thereby effectively avoiding the situation that the damping liquid flows out of the damping chamber to shorten the time delay duration before the time delay mechanism starts, and further ensuring the accuracy of the time delay mechanism; after the time delay mechanism is triggered to start, the first component moves relative to the second component by a distance, compresses the damping chamber and forms a passage for the damping liquid to flow out of the damping chamber, and continues to compress the damping chamber in the subsequent movement of the first component, thereby extruding the damping liquid from the damping chamber, providing resistance to the movement of the first component in the process of extruding the damping liquid, delaying the time for the first component to move to the third position, and achieving the time delay function of the time delay mechanism. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 is a schematic view of the second component during translation from the first position to the second position in the embodiment of the application;

[0030] Figure 2 is a schematic view of the second component during translation from the second position to the third position in the embodiment of the application;

[0031] Figure 3 is a schematic view of the second component in the third position in the embodiment of the application;

[0032] Figure 4 is a schematic view of the second component during translation from the first position to the second position in another embodiment of the application;

[0033] Figure 5 is a schematic view of the gap fitting section of the first component in the embodiment of the application;

[0034] Figure 6 is a schematic view of the gap fitting section of the first component in another embodiment of the application;

[0035] Figure 7 is a schematic view of the groove section of the second component in the embodiment of the application;

[0036] Figure 8 is a sectional view of the groove section of the second component in the embodiment of the application;

[0037] Figure 9 is a sectional view of an example of rotation of the second component relative to the first component in the embodiment of the application;

[0038] Figure 10 is an exploded schematic view of the second component and the first sealing element in the embodiment of the application;

[0039] Figure 11 is a schematic view of the second component during rotation from the first position to the second position in the embodiment of the application;

[0040] Figure 12 is a schematic view of the second component during rotation from the second position to the third position in an embodiment of the present application.

[0041] Reference signs: 1, first component; 11, barrel; 12, cover; 13, third sealing member; 14, partition; 2, second component; 21, groove segment; 211, middle column; 212, support rib; 213, through port; 22, rod-shaped body; 23, extension; 231, rotation shaft; 3, first sealing member; 31, annular portion; 32, U-shaped portion; 4, damping liquid; 5, damping chamber; 6, sealing fit segment; 7, clearance fit segment; 71, flow guide groove; 8, containing chamber; 9, second sealing member. DETAILED DESCRIPTION

[0042] Embodiments of the present application are described in detail below with reference to the accompanying drawings. The embodiments described below are examples for explaining the present application and should not be construed as limiting the present application.

[0043] In the description of the present application, it needs to be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential" and the like are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be construed as limiting the present application. In addition, the features defined as "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified and limited, the term "a plurality of" means two or more.

[0044] In the description of the present application, it needs to be understood that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0045] An injection device is capable of injecting a medicament contained therein through a needle from an injection site of a patient into the patient's body, which generally comprises a housing, a medicament vial, an activation mechanism and a pushing mechanism, wherein the medicament vial is mounted in the housing, and the medicament vial comprises a vial body, a medicament disposed in the vial body, a needle at a distal end of the vial body and a movable piston at a proximal end of the vial body, the pushing mechanism is used to push the movable piston to inject the medicament in the vial body from the needle into the patient's body, and the activation mechanism is used for a user to operate to trigger the pushing action of the pushing mechanism.

[0046] During an actual injection, the injected medicament generally needs a period of time to be completely discharged from the medicament vial, and the medicament also needs a certain period of time to be dispersed at the injection site, if the needle of the injection device is pulled out from the injection site immediately after the injection is completed, it may cause the medicament not to be completely discharged from the medicament vial, and / or cause the medicament to flow out from the injection site, which will cause a part of the medicament not to be completely injected into the patient's body. For this reason, some injection devices are provided with a delay mechanism, which cooperates with the pushing mechanism, when the pushing mechanism pushes the movable piston of the medicament vial to the most distal end, the delay action of the delay mechanism is triggered and gives a visual / audible / tactile signal after a period of time interval to prompt the user that the needle can be pulled out from the injection site at this time; and some injection devices further comprise a needle retraction mechanism for automatically removing the needle from the injection site of the patient, which cooperates with the delay mechanism, when the pushing mechanism pushes the movable piston of the medicament vial to the most distal end, the delay action of the delay mechanism is triggered and triggers the needle retraction action of the needle retraction mechanism after a period of time interval to automatically remove the needle from the injection site of the patient.

[0047] In the related art, the delay mechanism mainly comprises a movable delay component and a damper for providing resistance to the delay component; wherein the delay component is generally powered by a power spring, the damper cooperates with the delay component to form a damping chamber with a preformed channel, and the damping chamber has a high-viscosity liquid therein; the movable delay component gradually compresses the damping chamber and extrudes the high-viscosity liquid out of the damping chamber through the channel, and uses the resistance of the high-viscosity liquid to delay the movement of the delay component to achieve the delay function, but part of the high-viscosity liquid may flow out of the damping chamber through the channel before the delay mechanism is started, which will reduce the total time length of the delay mechanism and affect the accuracy of the delay mechanism.

[0048] The embodiments of the present application disclose a delay mechanism, which can avoid the damping liquid from flowing out of the damping chamber before the delay mechanism is started, thereby ensuring the accuracy of the delay mechanism.

[0049] Reference Figures 1 to 12, the delay mechanism comprises a first component 1, a second component 2, a first seal 3, a damping liquid 4 and a filling fluid; wherein the first component 1 is sleeved with the second component 2, and the second component 2 is in a first position relative to the first component 1 before the delay mechanism is triggered, and the second component 2 can move from the first position to a third position via a second position relative to the first component 1 after the delay mechanism is triggered, Figure 1 and Figure 2 、 Figure 11 and Figure 12 is the movement process in some embodiments; meanwhile, the second component 2 is in the third position relative to the first component 1 after the extension action of the delay mechanism is completed.

[0050] Specifically, when the second component 2 is in the first position, the first component 1, the second component 2 and the first seal 3 cooperatively form a damping chamber 5, the damping liquid 4 and the filling fluid are both contained in the damping chamber 5, and the damping chamber 5 is configured to prevent the damping liquid 4 from flowing out, thereby avoiding the damping liquid 4 from flowing out of the damping chamber 5 before the delay mechanism is triggered. During the movement of the second component 2 from the first position to the second position, the first component 1 and the second component 2 form a sliding seal structure through the cooperation of the first seal 3, which enables the relative movement of the first component 1 and the second component 2 and forms a seal through the first seal 3 to prevent the damping liquid 4 from passing through, during which the damping chamber 5 is compressed and the filling fluid is compressed and / or discharged; during the movement of the second component 2 from the second position to the third position, the damping chamber 5 is communicated with a passage for the damping liquid 4 to flow out, so that the damping chamber 5 is compressed and the damping liquid 4 is squeezed out of the damping chamber 5, and the resistance provided by the damping liquid 4 being squeezed out of the damping chamber 5 during the movement of the second component 2 relative to the first component 1 realizes the delay function of the delay mechanism.

[0051] With the above scheme, before the delay mechanism is triggered, the damping chamber 5 is in a sealed state that limits the flow of the damping liquid 4, thereby effectively avoiding the situation that the damping liquid 4 flows out of the damping chamber 5 before the delay mechanism is triggered, thereby ensuring the accuracy of the delay mechanism; after the delay mechanism is triggered, the first component 1 will move a distance relative to the second component 2, compress the damping chamber 5 and form a passage for the damping liquid 4 to flow out of the damping chamber 5, and continue to compress the damping chamber 5 in the subsequent movement of the first component 1, thereby squeezing the damping liquid 4 out of the damping chamber 5, and providing resistance to the movement of the first component 1 in the process of the damping liquid 4 being squeezed out, thereby delaying the time of the first component 1 moving to the third position, and realizing the delay function of the delay mechanism.

[0052] It can be understood that the first component 1 is sleeved with the second component 2 means that the two components form a sleeved relationship; wherein, the first component 1 can be sleeved outside the second component 2, or the second component 2 can be sleeved outside the first component 1. Correspondingly, the second component 2 can move relative to the first component 1 after the delay mechanism is started, which means that the first component 1 and the second component 2 have a relative position change relationship; wherein, it can be a relative movement formed by the first component 1 being stationary and the second component 2 moving, or a relative movement formed by the second component 2 being stationary and the first component 1 moving, or a relative movement formed by the first component 1 and the second component 2 moving simultaneously but having one of the movement speed and direction different. At the same time, the first position, the second position and the third position all represent the relative position of the second component 2 based on the first component 1, and it can be understood that the second component 2 is in the first position relative to the first component 1.

[0053] It should be noted that the damping liquid 4 and the filling fluid are simultaneously accommodated in the damping chamber 5, which means that the total volume of the damping liquid 4 is less than the total volume of the damping chamber 5 in this case, and the difference between the two is filled by the filling fluid. The damping liquid 4 is preferably a liquid with relatively high dynamic viscosity, and in some embodiments, a liquid with a dynamic viscosity of 5000 cP to 100000 cP can be selected as the damping liquid 4; in some more specific examples, damping oil, silicone oil or glycerol can be selected as the damping liquid 4. In addition, in some other embodiments, some liquids with relatively low dynamic viscosity can also be used, for example, in some embodiments, a liquid with a dynamic viscosity of less than 5000 cP is selected as the damping liquid 4.

[0054] Correspondingly, in some specific embodiments, the filling fluid is a filling gas, which can be directly discharged or compressed as the damping chamber 5 is compressed; further, the filling gas can be selected as a gas that does not react with the damping liquid 4, and in the case of meeting the foregoing requirements, air can be directly used as the filling gas. In some other specific embodiments, the filling fluid is a filling liquid, and the filling liquid can be compressed as the damping chamber 5 is compressed; in some specific examples, the filling liquid is selected as a liquid that does not react with the damping liquid 4 and is easy to compress, preferably a volatile liquid; for example, alcohol, gasoline, kerosene, acetone, toluene, xylene, methanol, diethyl ether, chloroform, carbon tetrachloride, ammonia, acetic acid, benzene, formaldehyde or petroleum ether.

[0055] Further, in some embodiments where the filling fluid is a filling gas, the damping chamber 5 during the movement of the second component 2 from the first position to the second position is configured to be closed to the gas, so that the filling gas in the damping chamber 5 is compressed as the damping chamber 5 is compressed during this period; in other embodiments, the damping chamber 5 during the movement of the second component 2 from the first position to the second position is configured to be able to discharge the gas, and based on the position of the discharge outlet and the use posture of the injection device, the filling gas in the damping chamber 5 during actual use may be directly discharged as the damping chamber 5 is compressed, or may be partially discharged and partially compressed as the damping chamber 5 is compressed.

[0056] Also need to be explained is that, during the movement of the second component 2 relative to the first component 1 from the first position to the second position, the damping chamber 5 is in a state of limiting the outflow of the damping liquid 4, and during the movement of the second component 2 relative to the first component 1 from the second position to the third position, the damping chamber 5 is communicated with a channel for the outflow of the damping liquid 4, and the second position can be regarded as a critical position at which the damping chamber 5 changes from limiting the outflow of the damping liquid 4 to allowing the outflow of the damping liquid 4; accordingly, in this scheme, the second position of the second component 2 relative to the first component 1 is defined as the position at which the damping chamber 5 is just communicated with the damping liquid 4 outflow channel.

[0057] In addition, the relative movement between the first component 1 and the second component 2 described above can be a relative translation of the first component 1 and the second component 2, as shown in Figures 1 to 8 ; or can be a relative rotation of the first component 1 and the second component 2, as shown in Figures 9 to 12 .

[0058] Some embodiments of the relative translation of the first component 1 and the second component 2 are described below.

[0059] Referring to Figures 1 to 4 , in some embodiments, the second component 2 is translated relative to the first component 1 to move from the first position to the third position via the second position; wherein the first component 1 is substantially cylindrical, and the first component 1 includes a containing space having a bottom, and the second component 2 is substantially columnar, and the second component 2 extends into the containing space of the first component 1. The end of the second component 2 extending into the containing space and the bottom of the containing space respectively constitute part of the cavity wall of the damping chamber 5; at the same time, the central axes of the first component 1 and the second component 2 are collinear, and the second component 2 is translated relative to the first component 1 in a direction parallel to the central axis.

[0060] Referring to Figures 1 to 3In some specific examples, the first component 1 comprises a barrel 11, a cover 12 and a third seal 13, and an open end of the barrel 11 is covered by the cover 12 to form a containing space with a bottom; meanwhile, an outer wall of the barrel 11 covered by the cover 12 is provided with an annular groove, and the third seal 13 is an elastic sealing ring sleeved in the annular groove, and an outer wall of the third seal 13 abuts against an inner wall of the cover 12, so that the barrel 11 and the cover 12 form a sealing structure preventing the damping liquid 4 from flowing out through the third seal 13. During use of the injection device, the cover 12 of the first component 1 is usually at the upper side, so that the filling air is closer to the cover 12 relative to the damping liquid 4. If the sealing structure formed by the cover 12 and the barrel 11 through the third seal 13 is configured to allow the filling air to pass through, the damping chamber 5 is compressed during movement of the second component 2 relative to the first component 1 from the first position to the second position, so that the filling air is directly discharged; if the sealing structure formed by the cover 12 and the barrel 11 through the third seal 13 is configured to prevent the filling air from passing through, the damping chamber 5 is compressed during movement of the second component 2 relative to the first component 1 from the first position to the second position, so that the filling air is compressed.

[0061] With reference to Figure 4 In some specific examples, the barrel wall and the barrel bottom of the first component 1 are integrally formed to form a containing space with a bottom; accordingly, during use of the injection device, the bottom of the containing space is at the upper side, so that the filling space is closer to the bottom of the containing space relative to the damping liquid 4. The damping chamber 5 is compressed during movement of the second component 2 relative to the first component 1 from the first position to the second position, so that the filling fluid is compressed.

[0062] Further, in some embodiments in which the second component 2 translates relative to the first component 1, the first seal 3 is configured between the first component 1 and the second component 2, and one of the first component 1 and the second component 2 remains stationary relative to the first seal 3, and the other comprises a sealing fit segment 6 and a clearance fit segment 7. During movement of the second component 2 from the first position to the second position, the first seal 3 cooperates with the sealing fit segment 6 to form a sliding sealing structure between the first component 1 and the second component 2 through the first seal 3; during movement of the second component 2 from the second position to the third position, the first seal 3 cooperates with the clearance fit segment 7, so that a gap is formed between the first seal 3, the first component 1 and the second component 2 to form a passage for the damping liquid 4 to flow out of the damping chamber 5.

[0063] With reference to Figure 1 , Figure 5 and Figure 6In some specific embodiments, the first component 1 is sleeved outside the second component 2, the first seal 3 is a sealing ring, and the first seal 3 is fixedly sleeved in the annular groove of the outer wall of the second component 2 to keep the first seal 3 and the second component 2 relatively stationary, and the inner wall of the first component 1 includes the sealing fit segment 6 and the gap fit segment 7 distributed along the translation direction of the second component 2. The inner wall of the first component 1 at the sealing fit segment 6 is tightly abutted against the first seal 3 and can slide relatively, so as to realize the sliding sealing structure between the first component 1 and the second component 2 at the first seal 3; at the same time, the inner wall of the first component 1 at the gap fit segment 7 has a gap with the first seal 3, thereby forming a channel for the damping liquid 4 to flow out. For details, see Figure 1 and Figure 4 In some specific examples, the sealing fit segment 6 and the gap fit segment 7 of the first component 1 are both in the cylinder body 11, the cylinder body 11 of the first component 1 is provided with the flow guide groove 71 extending along the translation direction at the inner wall of the gap fit segment 7, and the groove bottom of the flow guide groove 71 has a gap with the first seal 3, thereby forming a channel for the damping liquid 4 to flow out. For details, see Figure 1 and Figure 5 In some other specific examples, the sealing fit segment 6 and the gap fit segment 7 of the first component 1 are both in the cylinder body 11, the cylinder body 11 of the first component 1 has a larger inner diameter at the gap fit segment 7 than at the sealing fit segment 6, so that the first component 1 is isolated from the first seal 3 at the gap fit segment 7, thereby forming a channel for the damping liquid 4 to flow out.

[0064] In some other specific embodiments, the first component 1 is sleeved outside the second component 2, the first seal 3 is configured as a sealing ring embedded in the annular groove of the inner wall of the first component 1, and the second component 2 is configured to have the outer wall including the sealing fit segment 6 and the gap fit segment 7 distributed along the translation direction. The outer wall of the second component 2 at the sealing fit segment 6 is tightly abutted against the first seal 3 and can slide relatively, so as to realize the sliding sealing structure between the first component 1 and the second component 2 at the first seal 3; at the same time, the outer wall of the second component 2 at the gap fit segment 7 has a gap with the first seal 3, thereby forming a channel for the damping liquid 4 to flow out. In some specific examples, the outer wall of the second component 2 is provided with the flow guide groove 71 extending along the translation direction at the gap fit segment 7, and the groove bottom of the flow guide groove 71 has a gap with the first seal 3, thereby forming a channel for the damping liquid 4 to flow out; in some other specific examples, the second component 2 has a smaller outer diameter at the gap fit segment 7 than at the sealing fit segment 6, so that the second component 2 is isolated from the first seal 3 at the gap fit segment 7, thereby forming a channel for the damping liquid 4 to flow out.

[0065] Further, in combination with Figure 7 and Figure 8, the second sealing member 9, the first component 1, the second component 2, the first sealing member 3 and the second sealing member 9 cooperatively form the containing chamber 8; during the movement of the second component 2 from the second position to the third position, the passage through which the damping liquid 4 flows out of the damping chamber 5 is communicated with the containing chamber 8, so that the damping liquid 4 can be extruded from the damping chamber 5 to the containing chamber 8. In some embodiments, in order to form a stable containing chamber 8, one of the first component 1 and the second component 2 is kept stationary relative to the second sealing member 9 and is provided with the groove segment 21, and the other one slides relative to the second sealing member 9 and maintains sealing, the groove segment 21 is between the first sealing member 3 and the second sealing member 9 and constitutes part of the cavity wall of the containing chamber 8. Further, in some specific examples, the groove segment 21 includes support ribs 212 arranged at intervals, a groove is formed between any two adjacent support ribs 212, and the support rib 212 is provided with a through opening 213 that communicates the adjacent two grooves, so that the damping liquid 4 can flow between the adjacent grooves.

[0066] Referring to Figure 1 , Figure 7 and Figure 8 , in some embodiments, the first component 1 is sleeved outside the second component 2, the first sealing member 3 and the second sealing member 9 are elastic sealing rings sleeved in the annular groove on the outer wall of the second component 2 at intervals; the second sealing member 9 is on the side of the first sealing member 3 away from the damping chamber 5, so that the first component 1, the second component 2, the first sealing member 3 and the second sealing member 9 cooperatively form the containing chamber 8, and the first sealing member 3 forms the junction area between the damping chamber 5 and the containing chamber 8, so that the passage through which the damping liquid 4 flows out of the damping chamber 5 can communicate the damping chamber 5 with the containing chamber 8. The first component 1 and the second component 2 form a sliding sealing structure through the second sealing member 9, which is configured to prevent the damping liquid 4 from passing through.

[0067] Further, the second component 2 can drive the third sealing member 13 to move relative to the first component 1, and during the movement, the third sealing member 13 slides relative to the inner wall of the first component 1 and maintains a tight seal; at the same time, the second component 2 has the groove segment 21 between the first sealing member 3 and the second component, and the groove segment 21 never constitutes part of the cavity wall of the containing chamber 8. Specifically, the groove segment 21 includes a center column 211 arranged centrally and support ribs 212 uniformly distributed around the center column 211, which are used to improve the support strength of the groove segment 21; at the same time, a groove for containing the damping liquid 4 is formed between any two adjacent support ribs 212, and accordingly, the support rib 212 also serves as a baffle structure separating the adjacent two grooves, and in order to facilitate the flow of the damping liquid 4 between the adjacent grooves, the support rib 212 is also provided with a through opening 213 that communicates the adjacent two grooves. Referring to Figure 7 andFigure 8 In specific examples, the through-passage 213 is configured as a notch radially away from the edge of the middle column 211 for facilitating the molding of the through-passage 213, and the number of through-passages 213 can be one or more as needed.

[0068] Some embodiments of the relative rotation between the first component 1 and the second component 2 are described below.

[0069] With reference to Figures 9 to 12 In some embodiments, the second component 2 rotates relative to the first component 1 from the first position to the third position via the second position.

[0070] With specific reference to Figure 9 In some specific examples, the first component 1 is substantially cylindrical, and the first component 1 includes a containing space having a bottom, and the second component 2 is substantially rod-shaped and extends into the containing space of the first component 1. Meanwhile, the central axes of the first component 1 and the second component 2 are collinear, and the second component 2 rotates relative to the first component 1 about the central axis. In some embodiments, the first component 1 includes a barrel 11, a cover 12, and a third seal 13, and the open end of the barrel 11 is covered by the cover 12 to form the containing space having a bottom; meanwhile, the outer wall of the barrel 11 covered by the cover 12 is provided with an annular groove, the third seal 13 is an elastic sealing ring fitted in the annular groove, and the outer wall of the third seal 13 abuts against the inner wall of the cover 12, so that the barrel 11 and the cover 12 form a sealing structure that prevents the damping liquid 4 from flowing out through the third seal 13. In other embodiments, the barrel wall and the barrel bottom of the first component 1 are integrally formed to form the containing space having a bottom.

[0071] Specifically, with reference to Figure 9 , Figure 10 and Figure 11 , the second component 2 includes a circular rod-shaped main body 22 and a flat extension 23 at the end of the rod-shaped main body 22, and the extension 23 and part of the rod-shaped main body 22 of the second component 2 extend into the containing space of the first component 1; meanwhile, the extension 23 includes a rotation shaft 231, the inner wall of the barrel 11 of the first component 1 is symmetrically provided with two partitions 14, and the two partitions 14 abut against the rotation shaft 231 of the extension 23 to form a sealing fit structure that prevents the damping liquid from passing through. The first seal 3 includes an annular portion 31 and a U-shaped portion 32, wherein the annular portion 31 is fixedly embedded in the annular groove on the outer wall of the rod-shaped main body 22 of the second component 2, and the U-shaped portion 32 is fixedly embedded in the U-shaped groove extending from the outer wall of the extension 23 of the second component 2. In the assembled state of the second component 2 and the first component 1, the inner wall of the first component 1 and the rod-shaped main body 22 of the second component 2 form a sealing fit structure through the annular portion 31 of the first seal 3, which can prevent the damping liquid 4 from passing through.

[0072] Further, referring to Figure 11 During the movement of the second component 2 from the first position to the second position, the inner wall of the first component 1 and the extension 23 of the second component 2 can form a sealing fit structure preventing the damping liquid 4 from passing through the U-shaped part 32 of the first seal 3; at this time, the inner wall of the first component 1, the partition 14 of the first component 1, the rod-shaped body 22 of the second component 2, the extension 23 of the second component 2 and the first seal 3 form four chambers, two of which are gradually compressed as the second component 2 moves as damping chambers 5 containing the damping liquid 4 and the filling fluid, and the other two are gradually expanded as the second component 2 moves as containing chambers 8. During the movement of the second component 2 from the first position to the second position, the damping chambers 5 are gradually compressed and the containing chambers 8 are gradually expanded, and the filling fluid in the damping chambers 5 is compressed or extruded into the containing chambers 8.

[0073] In combination with Figure 11 and Figure 12 , the inner wall of the first component 1 includes a sealing fit section 6 and a clearance fit section 7, wherein the sealing fit section 6 is tightly sealed with the U-shaped part 32 of the first seal, and the clearance fit section 7 forms a gap with the U-shaped part 32 of the first seal by providing a groove in the side wall or increasing the inner diameter of the clearance fit section 7 compared to the sealing fit section 6, so that the damping chambers 5 and the containing chambers 8 form a passage for the damping liquid 4 to flow. Accordingly, during the movement of the second component 2 from the second position to the third position, the damping chambers 5 are gradually compressed and the containing chambers 8 are gradually expanded, and the damping liquid 4 in the damping chambers 5 is slowly extruded into the containing chambers 8, and the damping liquid 4 provides resistance to the rotation of the second component 2, delays the time for the second component 2 to rotate to the third position, and realizes the time delay function.

[0074] The embodiments of the present application also disclose an injection device, which comprises a pushing mechanism and the above-mentioned time delay mechanism, and the relative movement between the first component and the second component in the time delay mechanism is triggered when the pushing action of the pushing mechanism is completed; the time delay action is completed and a prompt signal is given when the first component moves to the third position relative to the second component. The prompt signal can be a visual signal, an audible signal or a tactile signal, and the user can pull the needle out of the injection site based on the prompt signal.

[0075] The embodiments of the present application also disclose an injection device, which comprises a pushing mechanism, a needle retracting mechanism and the above-mentioned time delay mechanism, and the relative movement between the first component and the second component in the time delay mechanism is triggered when the pushing action of the pushing mechanism is completed; the time delay action is completed and the automatic needle retracting action of the needle retracting mechanism is triggered when the first component moves to the third position relative to the second component, and the needle is pulled out of the injection site by the needle retracting mechanism.

[0076] The above are all preferred embodiments of the present application, and do not limit the protection scope of the present application, so that: all equivalent changes made according to the structure, shape, principle of the present application should be covered in the protection scope of the present application.

Claims

1. A time delay mechanism characterized by, The damper mechanism comprises a first component, a second component, a first seal, a damping liquid and a filling fluid. The first component is sleeved with the second component, and the second component is movable relative to the first component from a first position to a third position via a second position. When the second component is in the first position, the first component, the second component and the first seal cooperate to form a damping chamber which prevents the damping liquid from flowing out, and the damping liquid and the filling fluid are accommodated in the damping chamber. During movement of the second component from the first position to the second position, the first component and the second component cooperate with the first seal to form a sliding seal structure which prevents the damping liquid from passing through, and the damping chamber is compressed and compresses and / or discharges the filling fluid. During movement of the second component from the second position to the third position, the damping chamber is connected with a passage for the damping liquid to flow out, and the damping chamber is compressed and extrudes the damping liquid from the damping chamber.

2. The delay mechanism of claim 1, wherein, The first seal is between the first component and the second component, and one of the first component and the second component is stationary relative to the first seal, and the other one comprises a sealing fitting section and a gap fitting section. During movement of the second component from the first position to the second position, the first seal cooperates with the sealing fitting section, so that the first component and the second component form the sliding seal structure through the first seal. During movement of the second component from the second position to the third position, the first seal cooperates with the gap fitting section, so that there is a gap between the first seal, the first component and the second component to form a passage for the damping liquid to flow out of the damping chamber.

3. The time delay mechanism of claim 2, wherein, The surface of the gap fitting section is provided with a flow guide groove, and the groove bottom of the flow guide groove has a gap with the first seal to form a passage for the damping liquid to flow out of the damping chamber.

4. The delay mechanism of claim 1, wherein, The delay mechanism further comprises an accommodation chamber, during movement of the second component from the second position to the third position, the passage connected with the damping chamber for the damping liquid to flow out is connected with the accommodation chamber, and the damping liquid can be extruded to flow from the damping chamber to the accommodation chamber.

5. The time delay mechanism of claim 4, wherein, The delay mechanism further comprises a second seal, and the first component, the second component, the first seal and the second seal cooperate to form the accommodation chamber; one of the first component and the second component is stationary relative to the second seal and is provided with a groove section, and the other one slides relative to the second seal and maintains sealing, and the groove section is between the first seal and the second seal and constitutes part of the cavity wall of the accommodation chamber.

6. The time delay mechanism of claim 5, wherein, The groove section comprises spaced apart support ribs, and grooves are formed between adjacent two support ribs, and the support ribs are provided with guide openings which guide adjacent two grooves.

7. The delay mechanism of claim 1, wherein, The first component comprises a containing space with a bottom, the second component extends into the containing space, and the end of the second component extending into the containing space and the bottom of the containing space respectively form part of the cavity wall of the damping chamber.

8. The time delay mechanism of claim 7, wherein, The first component comprises a barrel, a cover and a third sealing member, the containing space with a bottom is formed by the open end of the barrel being covered by the cover, and the barrel and the cover form a sealed structure preventing the damping liquid from flowing out through the third sealing member.

9. The delay mechanism of claim 1, wherein, The first component moves from the first position to the third position via the second position by translation relative to the second component, or the first component moves from the first position to the third position via the second position by rotation relative to the second component.

10. An injection device, characterized in that The delay mechanism as claimed in any one of claims 1 to 9, and a pushing mechanism, wherein the relative movement between the first component and the second component in the delay mechanism is triggered when the pushing action of the pushing mechanism is completed. A prompt signal is given when the first component moves to the third position relative to the second component, and / or a needle returning action is triggered when the first component moves to the third position relative to the second component.

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