Rapid butt joint structure of injection piston

Abstract

An injection piston rapid butt joint structure comprises a piston body movably installed in an injection cylinder, at least two elastic clamping positions evenly distributed in the circumferential direction are arranged at the rear end of the piston body, guide parts are arranged on the inner sides of the elastic clamping positions, and gear parts are arranged on the outer sides of the elastic clamping positions; an annular groove is formed in one end, matched with the piston main body, of the push rod; the guide part is used for guiding the push rod and the piston body to move relatively so as to drive the multiple elastic clamping positions to elastically expand outwards and be automatically clamped into the annular groove. The separating part is used for being fixed to the open end of the syringe, the separating part is provided with a through hole allowing the push rod to penetrate through, the diameter of the through hole is smaller than that of the circumcircle of the gear part so as to prevent the gear part from being disengaged, and when the push rod moves reversely, the separating part is used for driving the elastic clamping positions to elastically expand outwards and disengage from the annular groove. Omnidirectional rapid butt joint and one-key separation of the piston and the push rod can be achieved, only axial push-pull action is needed in the whole process, the manual rotation operation requirement is thoroughly eliminated, and the operation time is greatly shortened.

Description

Technical Field

[0001] This application relates to the field of high-pressure injection technology for medical devices, specifically to a quick docking structure for an injection piston. Background Technology

[0002] With increasing emphasis on health, imaging technology has become widely accepted and recognized, replacing outdated methods like surgery and laboratory tests. A syringe syringe, used in conjunction with a high-pressure injector, draws contrast agent into the syringe using the injector's mechanical and electrical control. This contrast agent is then injected into the affected area of ​​the patient, and the imaging scanning equipment creates a clear and stable image, allowing for accurate assessment of the patient's condition and guiding treatment. Currently, the injector's plunger and piston are designed for detachable connection; after use, the plunger can be removed for reuse. Therefore, the connection and separation of the piston structure within the syringe syringe is crucial for ensuring efficient operation of the equipment.

[0003] In existing technology, the piston body of a high-pressure injector has an elastic sealing ring at the front end and a push rod at the rear end. Specifically, the rear end of the piston body is equipped with a T-shaped mounting plate or two inward mounting plates, and the front end of the push rod is equipped with a corresponding interface. During use, the operator needs to align the piston body and push rod in one direction and then rotate them at a specific angle (e.g., 90 degrees) to manually engage the mounting plate with the corresponding interface of the device to achieve the connection of the piston structure. Similarly, during disassembly, the operator needs to rotate the piston body and piston body in the opposite direction at a specific angle and then separate them in the same direction.

[0004] In the above solution, the piston and the push rod of the equipment must have precise direction and angle when they are installed. Even slight deviation will result in failure to engage or insecure engagement, affecting the reliability of the equipment. At the same time, it requires manual operation by the operator, which increases the number of operation steps and time, and is particularly easy to reduce efficiency in emergency medical scenarios. Utility Model Content

[0005] This application provides a quick docking structure for injection pistons to achieve automatic docking and separation of pistons and assembly equipment, thereby reducing assembly accuracy requirements.

[0006] According to this application, one embodiment provides an injection piston quick-connection structure for a high-pressure contrast injection system, comprising:

[0007] The piston body is movably installed inside the syringe barrel. The rear end of the piston body is used to connect to the injection device. It is provided with at least two elastic locking positions evenly distributed along the circumference. The inner side of the elastic locking position has a guide part, and the outer side of the elastic locking position has a stop part.

[0008] A push rod, with an annular groove at one end adapted to the piston body, the annular grooves being continuously distributed circumferentially; a guide portion is used to guide the relative movement of the push rod and the piston body, thereby driving multiple elastic locking positions to elastically expand outward and automatically engage with the annular grooves, achieving locking between the piston body and the push rod; and

[0009] A separator is used to fix it to the opening end of the syringe. The separator has a through hole through which the push rod passes. The diameter of the through hole is smaller than the outer circle diameter of the stop part to prevent the stop part from disengaging. When the push rod moves in the opposite direction, the separator is used to drive multiple elastic locking positions to expand outward elastically and disengage from the annular groove, thereby realizing the automatic separation of the piston body and the push rod.

[0010] In another embodiment, the piston body includes an elastic sealing ring at the front end and a connector at the rear end. The elastic locking position is located at the rear end of the connector, and the rear end of the connector has a limiting portion evenly distributed along the circumference. The limiting portion and the elastic locking position are staggered and distributed along the same axis, and the limiting portion and the elastic locking position form a locking cavity for the push rod to be pushed in.

[0011] In another embodiment, the inner ring of a plurality of the limiting portions is configured as an arc surface that corresponds to and mates with the peripheral side surface of the push rod.

[0012] In another embodiment, a support rib is provided on the outer periphery of the limiting part.

[0013] In another embodiment, the number of elastic locking positions is three sets, and the three sets of elastic locking positions are evenly distributed at 120 degrees with the axis of the piston body as the center.

[0014] In another embodiment, the elastic locking position further includes a support frame and a locking block. The support frame is hollowed out and used to receive force and expand elastically. The locking block is used to lock into the annular groove. The guide portion is located on the side of the locking block near the push rod.

[0015] In another embodiment, the guide portion is configured as a guide surface that is radially inclined along the piston body, and the height of the guide surface gradually decreases from the outer ring to the inner ring of the piston body.

[0016] In another embodiment, the front end face of the push rod and the peripheral side face are configured as an inclined transition surface that mates with the guide surface, and the guide surface is configured as an arc shape in the circumferential direction that mates with the inclined transition surface of the push rod in the circumferential direction.

[0017] In another embodiment, the outer ring and inner ring of the stop portion have a height difference in the axial direction. When the push rod moves in the opposite direction, the separating member contacts the outer ring of the stop portion in advance and applies force to make the elastic locking position elastically expand outward.

[0018] In another embodiment, a cooperating guide portion is provided on the side of the stop portion opposite to the separating member.

[0019] According to the quick docking structure of the injection piston in the above embodiment, the piston body adopts at least two evenly distributed elastic locking positions, combined with the continuous annular groove around the push rod, so that the push rod automatically engages and connects during normal push-in, without the need for manual operation to determine and rotate the angle, thus eliminating directional limitations; during reverse movement, the separating member presses the stop part at the injection cylinder mouth, thereby causing the elastic locking position to open and release the push rod, achieving automatic disengagement. No manual operation is required throughout the process, improving the operating efficiency and reliability of the high-pressure injector. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall external structure of the injection piston quick docking structure in one embodiment;

[0021] Figure 2 This is a schematic diagram of the overall structure of the piston body in one embodiment;

[0022] Figure 3 This is a schematic diagram of the structure before the push rod and piston body are connected in another embodiment;

[0023] Figure 4 This is a schematic diagram of the structure after the push rod and piston body are docked in another embodiment;

[0024] Figure 5 This is a schematic diagram of the push rod and piston body in a state to be separated in another embodiment.

[0025] Figure label:

[0026] 1. Piston body; 11. Elastic locking mechanism; 111. Support frame; 112. Locking block; 113. Stopping part; 114. Guide part; 12. Elastic sealing ring; 13. Connecting piece; 14. Limiting part; 15. Support rib; 16. Locking cavity;

[0027] 2. Syringe;

[0028] 3. Push rod; 31. Annular groove; 32. Inclined transition surface;

[0029] 4. Separator; 41. Baffle; 42. Through hole; 43. Guide part. Detailed Implementation

[0030] The present application will now be described in further detail with reference to the accompanying drawings and specific embodiments. Similar elements in different embodiments are referred to by related similar element reference numerals. In the following embodiments, many details are described to facilitate a better understanding of the present application. However, those skilled in the art will readily recognize that some features may be omitted in different situations, or may be replaced by other elements, materials, or methods. In some cases, certain operations related to the present application are not shown or described in the specification. This is to avoid obscuring the core parts of the present application with excessive description. For those skilled in the art, detailed description of these related operations is not necessary; they can fully understand the related operations based on the description in the specification and general technical knowledge in the art.

[0031] Furthermore, the features, operations, or characteristics described in the specification can be combined in any suitable manner to form various embodiments, and the operational steps involved in each embodiment can also be rearranged or adjusted in a manner that is obvious to those skilled in the art. Therefore, the specification and drawings are only for clearly describing a particular embodiment and do not imply that they represent the necessary components and / or order.

[0032] The serial numbers assigned to components in this document, such as "first" and "second," are used only to distinguish the described objects and have no sequential or technical meaning. The terms "connection" and "linkage" used in this application, unless otherwise specified, include both direct and indirect connections (linkages).

[0033] Currently, the plunger 3 and piston of the high-pressure injector are designed to be detachably connected. After use, the plunger 3 can be removed for reuse. Therefore, the docking and disassembly of the piston structure inside the syringe barrel is a key link to ensure the efficient operation of the equipment. In the prior art, the front end of the piston body 1 of the high-pressure injector is an elastic sealing ring 12, and the rear end of the piston body 1 is used to connect the plunger 3. Specifically, the rear end of the piston body 1 is provided with a T-shaped mounting plate or two inward mounting plates, and the front end of the plunger 3 is provided with a corresponding interface. During use, the operator needs to align the piston body 1 and the plunger 3 in one direction, and then rotate them by a specific angle (e.g., 90 degrees) to manually engage the mounting plate with the corresponding interface of the equipment to achieve the connection of the piston structure. Similarly, during disassembly, the operator needs to rotate the plunger 3 and the piston body 1 in the opposite direction by a specific angle and then separate them in the same direction.

[0034] In existing technologies, piston installation requires precise orientation and angle between the piston and the device push rod 3. Even slight deviations can lead to failure to engage or insecure engagement, affecting the reliability of the equipment. Furthermore, manual operation by operators is required, increasing the number of steps and time involved, which can reduce efficiency, especially in emergency medical scenarios.

[0035] This application provides a quick-connect structure for an injection piston. Through the cooperation of multiple evenly distributed locking positions and grooves with elasticity, there is no specific directional requirement when the piston is locked and connected to the equipment. When the piston is locked in, the operator does not need to rotate the piston and components. The equipment push rod 3 is automatically guided to open the locking position and lock in when it moves forward. After the piston finishes working, the push rod 3 moves backward to a certain position and the piston and push rod 3 automatically separate. The assembly is simple, thereby realizing the automatic docking and separation of the piston and the assembly equipment and reducing the assembly accuracy requirements.

[0036] Please refer to Figure 1 , Figure 2 and Figure 3 A quick-connection structure for an injection piston includes a piston body 1, a push rod 3, and a separator 4. The piston body 1 is movably installed inside an injection cylinder 2. The push rod 3 is a propulsion structure for the injection device. The rear end of the piston body 1 is used to connect with the push rod 3 of the injection device. The separator 4 remains relatively fixed to the injection cylinder 2. Specifically, the piston body 1 has at least two circumferentially evenly distributed elastic locking positions 11. The end of the push rod 3 that is adapted to the piston body 1 has an annular groove 31, which is continuously distributed circumferentially. The inner side of the elastic locking position 11 has a guide portion 114, which is used to guide the push rod 3 and the piston body 2. The piston body 1 moves relative to the piston rod 3 to drive multiple elastic locking positions 11 to expand outward and automatically engage with the annular groove 31, thereby locking the piston body 1 and the push rod 3. The separator 4 is used to fix the piston body 1 to the opening end of the syringe 2. The separator 4 has a through hole 42 through which the push rod 3 passes. The outer side of the elastic locking position 11 has a stop part 113. The diameter of the through hole 42 is smaller than the outer circle diameter of the stop part 113 to prevent the stop part 113 from disengaging. When the push rod 3 moves in the opposite direction, the separator 4 is used to drive multiple elastic locking positions 11 to expand outward and disengage from the annular groove 31, thereby automatically separating the piston body 1 and the push rod 3.

[0037] The quick-connection structure of the injection piston in this application is used in a high-pressure contrast injection system. Existing piston structures and the push rod 3 of the injection device are both cylindrical. In this application, relative movement refers to movement towards each other. In this embodiment, both the piston body 1 and the push rod 3 are cylindrical in the injection direction, and both the front and rear ends are arranged along the injection direction; that is, the side of the injection cylinder 2 that discharges liquid is the "front," and the direction facing away is the "rear." Before injection, the push rod 3 corresponding to the injection device needs to be connected to the rear end of the piston body 1 inside the injection cylinder 2 to achieve automatic locking and separation between the push rod 3 and the piston body 1.

[0038] For further details, please refer to... Figure 2The piston body 1 includes an elastic sealing ring 12 at the front end and a connecting member 13 at the rear end. In this embodiment, the elastic sealing ring 12 can be made of fluororubber and is tightly fitted to the inner wall of the syringe 2. By moving within the syringe 2, high pressure is generated to draw in and discharge liquid or contrast agent. The front end of the connecting member 13 is connected and fixed to the elastic sealing ring 12. The elastic locking position 11 is located at the rear end of the connecting member 13, and the rear end of the connecting member 13 also has a limiting part 14 evenly distributed along the circumference. The limiting part 14 and the elastic locking position 11 are staggered and distributed along the same axis. The limiting part 14 and the elastic locking position 11 form a locking cavity 16 for the push rod 3 to be pushed in.

[0039] Please refer to Figure 2 The inner ring of the multiple limiting parts 14 is set as an arc surface that corresponds to the side of the push rod 3 to ensure the stability of the axial movement of the push rod 3.

[0040] Please refer to Figure 2 The limiting part 14 is provided with a supporting rib plate 15 on its outer periphery. The radial reinforcing rib design enhances the structural rigidity, strengthens the structure, and prevents the elastic locking part 11 from deforming excessively under high pressure. The staggered design of the limiting part 14 and the elastic locking part 11 not only provides a guiding function for the push rod 3, but also enhances the compressive strength through the supporting rib plate 15, ensuring long-term reliability.

[0041] In this embodiment, the connector 13, the elastic locking position 11, the limiting part 14 and the supporting rib 15 are integrally formed, for example, by integral injection molding, to enhance the integrity and structural stability of the piston body 1.

[0042] Please refer to Figure 2 , Figure 3 and Figure 4 The elastic locking position 11 also includes a support frame 111 and a locking block 112. The locking block 112 is located on one side of the locking cavity 16 and is used to lock into the annular groove 31. The rear end face of the locking block 112 is set as a guide part 114, and the front end face of the locking block 112 is set as a locking surface. The inner wall of the locking block 112 is in contact with the side wall of the push rod 3. The support frame 111 is hollowed out and is used to bear force and undergo elastic expansion.

[0043] For details, please refer to Figure 2 , Figure 3 and Figure 4 The guide portion 114 is configured as a guide surface that is radially inclined along the piston body 1, and the height of the guide surface gradually decreases from the outer ring to the inner ring of the piston body 1. The front end face and the peripheral side face of the push rod 3 are configured as an inclined transition surface 32 that mates with the guide surface. The guide surface is configured as an arc shape in the circumferential direction that mates with the inclined transition surface 32 of the push rod 3, so that the push rod 3 is introduced into the locking cavity 16 through the tight fit between the guide surface and the inclined transition surface 32.

[0044] Please refer to Figure 2 , Figure 3 and Figure 4 The inner wall of the locking block 112 is set in an arc shape in the circumferential direction to cooperate with the side wall of the push rod 3. When the push rod 3 enters the locking cavity 16, it will push the locking block 112 and the support frame 111 to expand outward until the locking position cooperates with the annular groove 31 and is locked into the annular groove 31.

[0045] Specifically, in this embodiment, the groove depth of the annular groove 31 is not less than the thickness of the locking block 112. The cross-section of the annular groove 31 is set as trapezoidal or arc-shaped, and the groove depth can be slightly greater than the thickness of the locking block 112 to ensure tight locking after locking and improve the stability of the connection between the two. The front end face of the locking block 112, i.e. the locking surface, is set on the radial plane of the piston body 1 so as to fit against the inner wall of the annular groove 31 and smoothly lock into the annular groove 31.

[0046] Please refer to Figure 2 In this embodiment, there are three sets of elastic locking positions 11, and the three sets of elastic locking positions 11 are evenly distributed at 120 degrees with the axis of the piston body 1 as the center. The number of limiting parts 14 is the same as that of elastic locking positions 11, which together form the circumferential enclosure structure of the push rod 3 to ensure that the circumferential force of the push rod 3 is uniform.

[0047] In other embodiments, the number of elastic clips 11 can be adjusted, for example, up to 4 (evenly distributed at 90 degrees) to enhance multi-angle adaptability.

[0048] Please refer to Figure 2 , Figure 3 and Figure 4 When the push rod 3 and the piston body 1 are docked, in this embodiment, the push rod 3 is connected to the circumferential continuous annular groove 31 by three elastic locking positions 11. During the normal forward pushing process, the inclined transition surface 32 contacts the guide part 114 of the elastic locking position 11, which forces the elastic locking position 11 to expand outward elastically and makes the locking block 112 automatically slide into the annular groove 31 and lock, thus completing the automatic locking of the push rod 3 and the piston body 1.

[0049] For further details, please refer to... Figure 2 , Figure 3 and Figure 5 The stop part 113 is set on the side of the support frame 111 away from the locking block 112. The outer ring and inner ring of the stop part 113 have a height difference in the axial direction, and the stop part 113 is located on the rear end side of the stop block in the axial direction. When the push rod 3 moves in the opposite direction, the separating part 4 contacts the outer ring of the stop part 113 in advance and applies force to make the elastic locking position 11 expand outward elastically.

[0050] For details, please refer to Figure 2 , Figure 3 and Figure 5In this embodiment, the stop part 113 is set as a stop bar, one end of which is fixed to the support frame 111, and the other end is suspended and set above the rear end of the support frame 111; the separator 4 in this embodiment is a baffle 41, which is fixed at the opening position of the injection cylinder 2. The "high" and "low" positions in this application are based on the axial direction of the piston body 1, that is, when the push rod 3 disengages, the separator 4 first applies force to the outer ring of the stop bar to prevent the piston body 1 from disengaging and drive the elastic locking position 11 to expand.

[0051] Please refer to Figure 2 , Figure 3 and Figure 5 The stop part 113 is provided with a guide part 43 that cooperates with each other on the side opposite to the separator 4. In this embodiment, the guide part 43 is set as a mutually cooperating inclined surface. The inclined surface of the stop part 113 is set between the outer ring and the inner ring of the stop part 113 to form an inclined guide surface. It cooperates with the guide surface parallel to the baffle 41 to make the separation process smooth and controllable, and avoid structural damage caused by the sudden disengagement of the elastic locking position 11.

[0052] Please refer to Figure 2 , Figure 3 and Figure 5 When the push rod 3 separates from the piston body 1, the push rod 3 retracts to the position of the baffle 41. The outer ring of the stop part 113 contacts the baffle 41 before the support frame 111. Due to the height difference, there is still room for movement between the piston body 1 and the baffle 41. As the push rod 3 continues to retract, the baffle 41 presses the stop part 113, causing the elastic locking 11 to open and the locking block 112 to leave the annular groove 31, releasing the push rod 3 and achieving automatic disengagement. No manual operation is required throughout the process, which improves the operating efficiency and reliability of the high-pressure injector.

[0053] The quick docking structure for the injection piston disclosed in this embodiment can achieve omnidirectional quick docking and one-click separation of the piston and push rod 3. The entire process only requires axial push-pull action, and this action is automatically controlled by the injection device, completely eliminating the need for manual rotation operation, greatly shortening the operation time, and enabling rapid response in emergency medical scenarios.

[0054] The above-described specific examples are for illustrative purposes only and are not intended to limit the scope of this invention. Those skilled in the art to which this invention pertains can make various simple deductions, modifications, or substitutions based on the concept of this invention.

Claims

1. A syringe piston quick docking structure for a high pressure contrast injection system, comprising: The piston body (1) is movably mounted in the syringe (2), and the rear end of the piston body (1) is connected with the injection device, and is provided with at least two elastic clamping positions (11) uniformly distributed in the circumferential direction, the inner side of the elastic clamping position (11) is provided with a guide portion (114), and the outer side of the elastic clamping position (11) is provided with a blocking portion (113). The push rod (3) is provided with an annular groove (31) on one end matched with the piston body (1), and the annular groove (31) is continuously distributed in the circumferential direction; the guide portion (114) is used to guide the relative movement of the push rod (3) and the piston body (1) to drive the elastic expansion of the plurality of elastic clamping positions (11) and automatically clamp into the annular groove (31), so as to realize the locking of the piston body (1) and the push rod (3). And The separating piece (4) is used for fixing the opening end of the syringe (2), and the separating piece (4) has a through hole (42) for the push rod (3) to pass through, the diameter of the through hole (42) is smaller than the diameter of the circumscribed circle of the blocking portion (113), so as to block the blocking portion (113) from being separated, and when the push rod (3) moves reversely, the separating piece (4) is used to drive the elastic expansion of the plurality of elastic clamping positions (11) and separate from the annular groove (31), so as to realize the automatic separation of the piston body (1) and the push rod (3). The piston body (1) includes a front end elastic sealing ring (12) and a rear end connecting piece (13), the elastic clamping position (11) is located at the rear end of the connecting piece (13), and the rear end of the connecting piece (13) is provided with a limiting portion (14) uniformly distributed along the circumferential line, the limiting portion (14) is staggered with the elastic clamping position (11) and is distributed along the same axis, and the limiting portion (14) and the elastic clamping position (11) form a clamping cavity (16) for the push rod (3) to push in.

2. The injection piston quick docking structure of claim 1, wherein, The inner circle of the plurality of limiting portions (14) is provided as an arc surface corresponding to the circumferential surface of the push rod (3).

3. The injection piston quick docking structure of claim 2, wherein, The limiting portion (14) is provided with a supporting rib plate (15) on the outer periphery.

4. The injection piston quick docking structure of claim 2, wherein, The number of the elastic clamping positions (11) is three groups, and the three groups of elastic clamping positions (11) are uniformly distributed at 120 degrees around the axis of the piston body (1).

5. The injection piston quick docking structure of claim 1, wherein, The elastic clamping position (11) further includes a supporting frame body (111) and a clamping block (112), the supporting frame body (111) is hollow and is used for force and elastic expansion, the clamping block (112) is used for clamping into the annular groove (31), and the guide portion (114) is located on the side of the clamping block (112) close to the push rod (3).

6. The injection piston quick docking structure of claim 1, wherein, The guide portion (114) is provided as an inclined guide surface in the radial direction of the piston body (1), and the height of the guide surface gradually decreases from the outer circle to the inner circle of the piston body (1).

7. The injection piston quick docking structure of claim 6, wherein, The inclined transition surface (32) is provided between the front end surface and the circumferential surface of the push rod (3) to match the guide surface, and the guide surface is provided as an arc shape matched with the inclined transition surface (32) of the push rod (3) in the circumferential direction.

8. The injection piston quick docking structure of claim 7, wherein, ​ 9. The injection piston quick docking structure of claim 1, wherein, The outer ring and the inner ring of the gear position part (113) have height difference in the axial direction, and when the push rod (3) moves reversely, the separating piece (4) contacts the outer ring of the gear position part (113) in advance and exerts force, so that the elastic clamping part (11) is elastically expanded outward.

10. The syringe piston quick dock structure of claim 9, wherein, The gear position part (113) is provided with a guide part (43) matched with the separating piece (4) on the opposite side.

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