Piston docking device for a high pressure contrast injector

Abstract

The application discloses a piston butt joint device of a high-pressure contrast injection syringe, which is used for inserting and connecting a piston rod and a piston, and comprises elastic clamping claws and a clamping ring. The elastic clamping claws are connected to the end face of the piston on the side facing the piston rod, the proximal end of the elastic clamping claws is an elastic connecting section, and the distal end is a bayonet section, the bayonet section is provided with a guide rib plate, and the elastic clamping claws are symmetrically arranged around the axis of the piston and are at least three in number. The piston rod comprises an inserting rod and a trip sleeve which is sleeved on the outside of the inserting rod in a threaded mode, the clamping ring is fixed on the inserting rod, and the piston is inserted into the piston rod. The side, away from the piston, of the guide rib plate is provided with a guide inclined surface, the side, close to the piston, of the clamping ring and the trip sleeve is provided with a driving inclined surface which can be attached to the guide inclined surface, and the driving inclined surface can make the distal end side of the elastic clamping claw tilt radially and gradually outwardly through the guide inclined surface. The piston butt joint device can realize the quick insertion and convenient disassembly of the piston and the piston rod, and can also ensure the reliability of the connection.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and in particular to a piston docking device for a high-pressure contrast injection syringe. Background Technology

[0002] In the use of high-pressure contrast injectors, the core actuating components include the piston and piston rod. The piston, as the component that directly contacts the contrast agent, must be designed as a disposable consumable to ensure hygiene, safety, and reliability. The piston rod, however, because it does not directly contact the contrast agent and requires high structural strength, is typically designed as a reusable component. Therefore, the piston and piston rod must be assembled and disassembled before and after each use.

[0003] Currently, the piston and piston rod connection structures of existing high-pressure contrast injection syringes mostly employ methods such as snap-fit ​​interference fit, pin fixing, or threaded connection. For example, when using a snap-fit ​​interference fit, the insertion process requires a large external force to press, which may push the piston, causing inconvenience in some scenarios and making disassembly difficult; when using a pin fixing method, additional pin insertion and removal operations are required, making the process cumbersome; while threaded connections are relatively convenient to disassemble, the reliability of the threaded connection may decrease during piston movement, and there is a risk that the piston rod may loosen or even fall off.

[0004] In summary, existing piston-piston rod docking structures generally suffer from problems such as inconvenient insertion and disassembly, and poor docking stability, making it difficult to meet the dual requirements of rapid operation and reliable connection. There is an urgent need for a docking device that can enable rapid insertion and convenient disassembly of the piston and piston rod to optimize clinical operation procedures and improve the performance of high-pressure contrast injections. Summary of the Invention

[0005] The purpose of this invention is to provide a piston docking device for a high-pressure contrast injection syringe, which solves the problems of inconvenient insertion and disassembly and poor docking stability of the existing piston and piston rod docking structure.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] A piston docking device for a high-pressure contrast-enhancing injector, the high-pressure contrast-enhancing injector including a piston rod for engaging with a piston of a syringe, the piston docking device comprising:

[0008] The elastic claw is connected to the end face of the piston facing the piston rod. The proximal end of the elastic claw near the piston is an elastic connecting section, and the distal end is a locking section. The locking section has a guide rib. At least three elastic claws are symmetrically arranged around the axis of the piston.

[0009] The piston rod includes a plug rod and a release sleeve threaded onto the outside of the plug rod. The locking ring is fixed to the plug rod. After the piston is plugged into the piston rod, the locking ring is used to lock into the locking section.

[0010] The guide rib has a guide slope on the side away from the piston, and the locking ring and the release sleeve both have a driving slope on the side near the piston that can fit with the guide slope. When the locking ring or the release sleeve moves toward the piston, the driving slope can cause the distal end of the elastic claw to tilt radially and gradually outward through the guide slope.

[0011] Optionally, the bayonet segment has a notch facing the inside of the piston, and the piston has a insertion groove;

[0012] After the piston and piston rod are connected, the end of the connecting rod abuts against the bottom of the connecting groove, the locking ring is engaged in the recess, and the end face of the locking ring facing away from the piston abuts against the lower side wall of the recess.

[0013] Optionally, the side wall of the insertion slot is provided with an axial guide strip, and the insertion rod is provided with a guide groove that cooperates with the guide strip.

[0014] Optionally, the piston docking device further includes a radial adjustment assembly for synchronously moving the three resilient jaws radially.

[0015] Optionally, the piston has a vertical sliding cavity and a horizontal sliding cavity inside, the vertical sliding cavity communicating with the horizontal sliding cavity, and the radial adjustment assembly includes:

[0016] A slip ring is slidably disposed in the vertical sliding cavity, and the outer wall of the slip ring is an inclined surface;

[0017] A slider is slidably disposed in the transverse sliding cavity and connected to the elastic claw through a connecting block. The inner sidewall of the slider has an inclined surface. The inclined surface of the slider has the same inclination angle as the inclined surface of the slip ring and fits against it. A spring is provided between the slider and the transverse sliding cavity. A transverse sliding hole is provided on the piston for the connecting block to slide. The transverse sliding hole communicates with the transverse sliding cavity.

[0018] The driving unit is used to drive the slip ring to move axially in the vertical sliding cavity, so as to drive the slider to move radially in the horizontal sliding cavity.

[0019] Optionally, a groove is formed on the inclined surface of the slider, and a limiting block is provided on the inclined surface of the slip ring, which slides in the groove. The limiting block slides along the groove and will not disengage from the groove.

[0020] Optionally, the piston has a vertical sliding hole, the vertical sliding hole connecting the insertion groove and the vertical sliding cavity, and the driving part includes:

[0021] The driven block is disposed in the vertical sliding cavity and fixedly connected to the slip ring. The guide strip is provided on both the upper and lower sides of the vertical sliding hole. The cross-sectional profile of the driven block is the same.

[0022] A screw is rotatably inserted into the guide bars on both sides of the vertical sliding hole, and the screw passes through the driven block and is threadedly connected.

[0023] The driven wheel is fixedly sleeved on the screw and located below the guide bar on the lower side. The side wall of the driven wheel is flush with the end face of the guide bar facing the inside of the insertion groove.

[0024] The drive wheel has a drive cavity inside the plug rod. The drive wheel is fan-shaped and symmetrically arranged in three parts. The outer wall of the drive wheel is flush with the bottom of the guide groove.

[0025] The plug rod has a rotating rod rotatably mounted inside it, and an air shaft is fixedly sleeved on the rotating rod. The drive wheel is sleeved on the air shaft.

[0026] Optionally, both the driven wheel and the driving wheel are coated with an anti-slip coating on their sidewalls.

[0027] Optionally, during the insertion of the piston rod, when the driving inclined surface of the locking ring just contacts the guide inclined surface, the distance between the end face of the locking ring on the side away from the piston and the lower sidewall of the notch is H. The distance H is the same for piston rods of different diameters.

[0028] Optionally, a slot is provided on the end face of the guide strip below the driven block facing the insertion groove, and an elastic block is provided on the insertion rod. The elastic block is located in the guide groove. When the insertion rod is inserted into the insertion groove, the driven wheel and the driving wheel are at the same height when the elastic block is engaged in the slot. The distance between the end face of the locking ring on the side away from the piston and the lower sidewall of the recess is greater than H.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] In the piston docking device of a high-pressure contrast injector provided in this embodiment of the invention, when the piston and piston rod are docked, the piston rod can be directly inserted into the piston. During the insertion process, the driving inclined surface of the locking ring fixedly sleeved on the outside of the insertion rod is in contact with the guide inclined surface of the guide rib plate, which can push the locking segment to tilt radially outward. After the insertion rod is inserted into place, the locking segment automatically springs back, and the locking ring is locked into the locking segment, thereby fixing the position of the piston and piston rod. At least three symmetrically arranged elastic jaws can firmly clamp the piston rod, preventing lateral displacement. When disassembling the piston and piston rod, by screwing on the release sleeve, the driving inclined surface on the release sleeve is made to fit with the guide inclined surface of the guide rib plate, thereby allowing the locking segments of the three elastic jaws to tilt radially outward simultaneously, thus detaching the piston rod from the piston. This allows for quick insertion and convenient disassembly of the piston and piston rod, while ensuring the reliability of the piston and piston rod connection. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] The structures, proportions, sizes, etc., shown in the accompanying drawings of this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the conditions under which the present invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that the present invention can produce, should still fall within the scope of the technical content disclosed in the present invention.

[0033] Figure 1 This is a schematic diagram of the structure after the piston and piston rod are connected in Example 1.

[0034] Figure 2 This is a cross-sectional view of the structure after the piston and piston rod are connected in Example 1.

[0035] Figure 3 This is a schematic diagram of the structure in Example 2 where the piston and piston rod are separated.

[0036] Figure 4 This is a cross-sectional view of the structure in Example 2 where the piston and piston rod are separated.

[0037] Figure 5 This is a cross-sectional view of the structure after the piston and piston rod are connected in Example 2.

[0038] Figure 6 for Figure 5 A magnified view of part A in the middle.

[0039] Illustrations: 100, Piston; 110, Insertion groove; 120, Vertical sliding cavity; 130, Lateral sliding cavity; 140, Vertical sliding hole; 150, Lateral sliding hole; 160, Guide bar; 200, Piston rod; 210, Insertion rod; 211, Guide groove; 212, Ring groove; 213, Drive cavity; 220, Release sleeve; 300, Docking device; 1, Elastic claw; 11, Elastic connecting section; 12, Bayonet section; 121, Notch; 13, Guide rib; 131, Guide slope; 2, Positioning ring; 21, Drive slope; 3, Radial adjustment assembly; 31, Slip ring; 32, Slider; 33, Drive unit; 331, Driven block; 332, Screw; 333, Driven wheel; 334, Driving wheel; 335, Rotating rod; 336, Air shaft. Detailed Implementation

[0040] To make the objectives, features, and advantages of this invention more apparent and understandable, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described below are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0041] In the description of this invention, it should be understood that the terms "upper," "lower," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. It should be noted that when a component is considered to be "connected" to another component, it can be directly connected to the other component or there may be a component positioned centrally in the connection.

[0042] This invention provides a piston docking device for a high-pressure contrast-enhancing injector. The high-pressure contrast-enhancing injector includes a piston and a piston rod. The piston docking device includes elastic claws and a locking ring. The elastic claws are connected to the end face of the piston facing the piston rod. The proximal end of the elastic claw near the piston is an elastic connecting section, and the distal end is a locking section. The locking section has a guide rib. At least three elastic claws are symmetrically arranged around the piston axis. The piston rod includes an insertion rod and a release sleeve threaded onto the outside of the insertion rod. The locking ring is fixed to the insertion rod. After the piston and piston rod are inserted, the locking ring is used to lock in the locking section. The guide rib has a guide slope on the side away from the piston. The locking ring and the release sleeve both have a driving slope on the side near the piston that can fit with the guide slope. When the locking ring or the release sleeve moves towards the piston, the driving slope can cause the distal end of the elastic claw to gradually tilt outward radially through the guide slope.

[0043] In the piston docking device of a high-pressure contrast injector provided in this embodiment of the invention, when the piston and piston rod are docked, the piston rod can be directly inserted into the piston. During the insertion process, the driving inclined surface of the locking ring fixedly sleeved on the outside of the insertion rod is in contact with the guide inclined surface of the guide rib plate, which can push the locking segment to tilt radially outward. After the insertion rod is inserted into place, the locking segment automatically springs back, and the locking ring is locked into the locking segment, thereby fixing the position of the piston and piston rod. At least three symmetrically arranged elastic jaws can firmly clamp the piston rod, preventing lateral displacement. When disassembling the piston and piston rod, by screwing on the release sleeve, the driving inclined surface on the release sleeve is made to fit with the guide inclined surface of the guide rib plate, thereby allowing the locking segments of the three elastic jaws to tilt radially outward simultaneously, thus detaching the piston rod from the piston. This allows for quick insertion and convenient disassembly of the piston and piston rod, while ensuring the reliability of the piston and piston rod connection.

[0044] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0045] like Figures 1-6 As shown, this embodiment of the invention provides a piston docking device for a high-pressure contrast injector. The high-pressure injector is used in conjunction with a syringe. The high-pressure injector includes a piston rod 200, and the syringe includes a piston 100. In use, the piston rod 200 and the piston 100 are inserted and engaged. The piston docking device in this embodiment is used in scenarios where the piston 100 and the piston rod 200 are inserted and disassembled, enabling rapid insertion and disassembly of the piston 100 and the piston rod 200. In this embodiment of the invention, through structural improvements, it has at least the advantages of rapid operation and reliable connection.

[0046] Example 1:

[0047] like Figure 1 , Figure 2 As shown, in this embodiment, the piston docking device includes an elastic claw 1 and a locking ring 2. The elastic claw 1 is connected to the end face of the piston 100 facing the piston rod 200. The proximal end of the elastic claw 1 near the piston 100 is an elastic connecting section 11, and the distal end is a locking section 12. The locking section 12 has a guide rib 13. At least three elastic claws 1 are symmetrically arranged around the axis of the piston 100. The piston rod 200 includes a plug rod 210 and a release sleeve 220 threaded onto the outside of the plug rod 210. The locking ring 2 is fixed to the plug rod 210. The piston 100 and the piston rod... After insertion, the locking ring 2 is used to lock in the locking section 12; wherein, the guide rib 13 has a guide slope 131 on the side away from the piston 100, and the locking ring 2 and the release sleeve 220 both have a driving slope 21 on the side near the piston 100 that can fit with the guide slope 131. When the locking ring 2 or the release sleeve 220 moves toward the piston 100, the driving slope 21 can make the distal side of the elastic claw 1 tilt radially and gradually outward through the guide slope 131.

[0048] Furthermore, the bayonet section 12 has a notch 121 facing the inside of the piston 100, and the piston 100 has an insertion groove 110; after the piston 100 and the piston rod 200 are inserted, the end of the insertion rod 210 abuts against the bottom of the insertion groove 110, the locking ring 2 is locked into the notch 121, and the end face of the locking ring 2 facing away from the piston 100 abuts against the lower side wall of the notch 121.

[0049] Specifically, the piston 100 has a circular cross-section insertion groove 110 on one side for inserting into the piston rod 200. The diameter of the insertion groove 110 can be equal to or greater than the diameter of the insertion rod 210. The elastic claws 1 can be fixedly connected to the end face of the piston 100 on the side with the insertion groove 110, and three are evenly and symmetrically arranged around the central axis of the insertion groove 110. In actual implementation, it can be expanded to 4-6 according to the load-bearing requirements. In this embodiment, three are preferred to balance elastic deformation and connection stability.

[0050] The piston rod 200 includes a plug rod 210 and a release sleeve 220. The release sleeve 220 is threaded onto the outside of the plug rod 210. The retaining ring 2 is fixed to the end of the plug rod 210 near the insertion slot 110. The outer side of the release sleeve 220 may be provided with anti-slip texture to facilitate the operator to rotate and apply force. In some automatic injectors, the release sleeve 220 can be driven to rotate by a motor. In the initial state, there is a gap between the retaining ring 2 and the end of the release sleeve 220. The outer edges of the retaining ring 2 and the release sleeve 220 near the piston 100 are both chamfered to form a driving inclined surface 21.

[0051] Meanwhile, the elastic claw 1 includes an elastic connecting section 11 connected to the piston 100 and a bayonet section 12 connected to the elastic connecting section 11. A guide rib 13 is connected to the outside of the bayonet section 12. The elastic connecting section 11, the bayonet section 12, and the guide rib 13 can be integrally formed. The elastic connecting section 11 can be made of medical-grade stainless steel or high-strength engineering plastic. It achieves radial opening and closing of the distal end of the elastic claw 1 through elastic deformation, ensuring that it still maintains its elastic recovery ability after repeated use. The bayonet section 12 forms a notch 121 on the outside for engaging the locking ring 2. The guide rib 13 is formed on the side of the bayonet section 12 away from the insertion groove 110 and extends along the shape of the bayonet section 12. The end of the guide rib 13 away from the piston 100 forms a guide slope 131. The guide slope 131 gradually slopes outward in the direction away from the piston 100, and the surface of the guide slope 131 is polished to reduce the frictional resistance when in contact with the driving slope 21. The angle of the driving inclined surface 21 is the same as that of the guide inclined surface 131 to ensure the uniformity of force when the two are in contact.

[0052] When the piston 100 is inserted into the piston rod 200, the end of the insertion rod 210 with the locking ring 2 is aligned with the center of the elastic claw 1 on the end face of the piston 100, and the piston rod 200 is pushed towards the piston 100, so that the insertion rod 210 is gradually inserted into the insertion groove 110; when the driving inclined surface 21 of the locking ring 2 contacts the guide inclined surface 131, the axial thrust is continued to be applied, the driving inclined surface 21 slides along the guide inclined surface 131, generating a radial component force, so that the distal end of the elastic claw 1 tilts outward; until the locking ring 2 completely passes over the guide rib 13, the elastic claw 1 is reset under the action of elastic restoring force, and the arc-shaped groove of the locking section 12 fits tightly with the locking ring 2. At this time, the locking ring 2 is restricted in the locking section 12, and the piston 100 and the piston rod 200 are stably connected. When disassembling piston 100 from piston rod 200, the release sleeve 220 is rotated towards piston 100. Once the driving inclined surface 21 of the release sleeve 220 contacts the guide inclined surface 131, the sleeve continues to rotate. The driving inclined surface 21 presses against the guide inclined surface 131, generating a radial force that causes the distal end of the elastic claw 1 to tilt outwards again. As the sleeve continues to move, the locking section 12 of the elastic claw 1 gradually disengages from the locking ring 2. At this point, the piston rod 200 is pulled away from piston 100, and the insertion rod 210 can be extracted from the elastic claw 1, thus disengaging piston 100 from piston rod 200. This achieves quick insertion and convenient disassembly of piston 100 and piston rod 200, while ensuring the reliability of the connection between piston 100 and piston rod 200.

[0053] In one exemplary embodiment of the present invention, an axially oriented guide bar 160 is provided on the side wall of the insertion groove 110, and a guide groove 211 that cooperates with the guide bar 160 is provided on the insertion rod 210. When the insertion rod 210 is inserted into the insertion groove 110, the cooperation of the guide bar 160 ensures that the insertion rod 210 is inserted vertically into the insertion groove 110 in the axial direction. At the same time, during and after insertion, the cooperation of the guide bar 160 and the guide groove 211 restricts the rotation of the insertion rod 210 around the axis, further improving the reliability of the connection between the piston 100 and the piston rod 200.

[0054] Example 2:

[0055] The difference between this embodiment and Embodiment 1 is that in this embodiment, the elastic jaws 1 are movably connected to the piston 100, and the piston docking device further includes a radial adjustment assembly 3 for synchronously moving the three elastic jaws 1 radially. By adjusting the three elastic jaws 1 radially, compatibility with different dimensional deviations of the locking rings 2 can be achieved. Piston rods 200 of different sizes have different outer diameters of their locking rings 2, thus allowing the piston 100 to be inserted into piston rods 200 of different sizes by radially adjusting the elastic jaws 1. This significantly improves versatility and reduces equipment procurement and maintenance costs for medical institutions.

[0056] like Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown, in this embodiment, the piston 100 has a vertical sliding cavity 120 and a horizontal sliding cavity 130 inside, the vertical sliding cavity 120 and the horizontal sliding cavity 130 are connected, and the radial adjustment assembly 3 includes:

[0057] The slip ring 31 is slidably disposed in the vertical sliding cavity 120, and the outer wall of the slip ring 31 is an inclined surface;

[0058] The slider 32 is slidably disposed in the transverse sliding cavity 130 and connected to the elastic claw 1 through a connecting block. The inner side wall of the slider 32 has an inclined surface. The inclined surface of the slider 32 has the same inclination angle as the inclined surface of the slip ring 31 and fits in place. A spring is provided between the slider 32 and the transverse sliding cavity 130. The piston 100 is provided with a transverse sliding hole 150 for the connecting block to slide. The transverse sliding hole 150 communicates with the transverse sliding cavity 130.

[0059] The drive unit 33 is used to drive the slip ring 31 to move axially in the vertical sliding cavity 120, so as to drive the slider 32 to move radially in the transverse sliding cavity 130.

[0060] Specifically, the vertical sliding cavity 120 is an annular inner cavity, and the horizontal sliding cavity 130 can be a strip-shaped inner cavity extending radially or an annular inner cavity. The vertical sliding cavity 120 and the horizontal sliding cavity 130 are connected. The slip ring 31 can slide along the axial direction of the piston 100 in the vertical sliding cavity 120, while the slider 32 can slide along the radial direction of the piston 100 in the horizontal sliding cavity 130. The horizontal sliding cavity 130 can be adapted to the slider 32. The horizontal sliding hole 150 is located on the end face of the piston 100 connected to the elastic claw 1. The horizontal sliding hole 150 is connected and extends radially. The connecting block slidably disposed in the horizontal sliding hole 150 connects the slider 32 and the elastic claw 1 together. When the slider 32 slides radially in the horizontal sliding hole 150, it can drive the elastic claw 1 to slide together. Both the slip ring 31 and the slider 32 have inclined surfaces, and these inclined surfaces are in contact with each other. When the drive unit 33 drives the slip ring 31 to slide vertically, it can apply a radial force to the slider 32 through the inclined surfaces, thereby pushing the slider 32 to move radially and then driving the slider 32 to slide radially. A radially spaced spring is provided on the slider 32 and the inner wall of the transverse sliding cavity 130. When the driving force of the drive unit 33 on the slip ring 31 is removed, the slider 32 can be pushed to return to its radial position under the restoring force of the spring.

[0061] It should be noted that a groove is formed on the inclined surface of the slider 32, and the slider 32, which slides in the groove, is provided on the inclined surface of the slip ring 31. The slider 32 slides along the groove and will not disengage from it. For example, the cross-sections of the groove and the slider 32 can be T-shaped, so that the slip ring 31 and the slider 32 can only move relative to each other along the inclined surface without disengaging. This facilitates precise radial adjustment of the elastic claw 1.

[0062] Furthermore, the piston 100 is provided with a vertical sliding hole 140, which connects the insertion groove 110 and the vertical sliding cavity 120. The drive unit 33 includes:

[0063] The driven block 331 is located in the vertical sliding cavity 120 and is fixedly connected to the slip ring 31. The vertical sliding hole 140 has guide bars 160 on both the upper and lower sides. The cross-sectional profile of the driven block 331 is the same.

[0064] The screw 332 is rotatably inserted into the guide bars 160 on both sides of the vertical sliding hole 140. The screw 332 passes through the driven block 331 and is threadedly connected.

[0065] Driven wheel 333 is fixedly sleeved on screw 332 and located below guide bar 160 on the lower side. The side wall of driven wheel 333 is flush with the end face of guide bar 160 facing the inside of insertion groove 110.

[0066] The drive wheel 334 and the plug rod 210 have a drive cavity 213 inside. The drive wheel 334 is fan-shaped and three are symmetrically arranged. The outer wall of the drive wheel 334 is flush with the bottom of the guide groove 211.

[0067] The plug rod 210 has a rotating rod 335 rotatably mounted inside it, and an air shaft 336 is fixedly mounted on the rotating rod 335. The drive wheel 334 is mounted on the air shaft 336.

[0068] Specifically, the driven block 331 is located in the insertion groove 110, and the vertical sliding hole 140 connects the insertion groove 110 and the vertical sliding cavity 120 and extends axially. When the driven block 331 moves axially, it can drive the slip ring 31 to move axially. Guide bars 160 are provided on both the upper and lower sides of the vertical sliding cavity 120. There is a gap between the lower guide bar 160 and the bottom surface of the piston 100. The driven block 331 is located between the two guide bars 160. The screw 332 passes through the upper guide bar 160, the driven block 331 and the lower guide bar 160 in sequence, and is threadedly connected to the driven block 331. The driven wheel 333 is fixedly sleeved on the screw 332 and is located below the lower guide bar 160. The bottom surface of the driven wheel 333 is higher than the bottom surface of the piston 100, or the bottom surface of the driven wheel 333 is flush with the bottom surface of the piston 100.

[0069] Meanwhile, a drive cavity 213 is formed inside the plug rod 210. The distance between the top inner wall of the drive cavity 213 and the top of the plug rod 210 is equal to the thickness of the guide strip 160 on the lower side. The drive wheel 334 has a fan-shaped structure, with each elastic claw 1 corresponding to one drive wheel 334. The side wall of the drive wheel 334 is flush with the bottom of the guide groove 211, and the side wall of the driven wheel 333 is flush with the end face of the guide strip 160 facing the plug groove 110. Therefore, when the plug rod 210 is inserted into the plug groove 110, the drive wheel 334 reaches the same height as the driven wheel 333, and the drive wheel 334 abuts against the driven wheel 333. In addition, a rotating shaft is rotatably provided inside the plug rod 210, and an air shaft 336 is connected to the rotating shaft. The drive wheel 334 is connected to the air shaft 336. For example, a movable protrusion can be provided on the side wall of the air shaft 336, and the driving wheel 334 can be connected to the protrusion. When the air shaft 336 is ventilated, it can push the protrusion to move radially, thereby driving the driving wheel 334 radially. This increases the contact force between the driving wheel 334 and the driven wheel 333, so that when the driving wheel 334 rotates, it can drive the driven wheel 333 to rotate through friction. When the driven wheel 333 rotates, it can drive the driven block 331 to move axially in the vertical sliding hole 140, thereby realizing the radial adjustment of the elastic pawl 1.

[0070] Furthermore, both the driven wheel 333 and the driving wheel 334 are coated with an anti-slip coating. This helps to further increase the friction between the driving wheel 334 and the driven wheel 333, making it easier for the driving wheel 334 to smoothly drive the driven wheel 333 to rotate.

[0071] In this embodiment of the invention, during the insertion process of the piston 100 and the piston rod 200, when the driving inclined surface 21 of the retaining ring 2 just contacts the guide inclined surface 131, the distance between the end face of the retaining ring 2 on the side away from the piston 100 and the lower sidewall of the recess 121 is H. For piston rods 200 of different diameters, H is the same. Specifically, when the piston rod 200 is fully inserted into the insertion groove 110, the top end face of the insertion rod 210 abuts against the bottom of the insertion groove 110. At this time, the end face of the retaining ring 2 on the side away from the piston 100 also fits perfectly against the lower sidewall of the recess 121, further ensuring the reliability of the insertion of the piston rod 200 and the piston 100.

[0072] For example, a slot is provided on the end face of the guide bar 160 below the driven block 331 facing the insertion groove 110, and the insertion rod 210 has an elastic block located in the guide groove 211. When the insertion rod 210 is inserted into the insertion groove 110, the driven wheel 333 and the driving wheel 334 are at the same height, and the distance between the end face of the locking ring 2 away from the piston 100 and the lower side wall of the recess 121 is greater than H.

[0073] When the piston rod 200 is inserted into the piston 100, the upper end of the insertion rod 210 is first inserted into the insertion groove 110. When the top end face of the insertion rod 210 moves to the same height as the top of the guide strip 160 on the lower side, the elastic block is engaged in the groove, which can provide a damping force for the insertion of the insertion groove 110. At this time, the driving wheel 334 and the driven wheel 333 are also at the same height. The side wall of the driving wheel 334 abuts against the side wall of the driven wheel 333, allowing the air shaft 336 to vent. Thus, the driving wheel 334 can be driven by rotating the rotating rod 335, and the driving wheel 334 can drive the driven wheel 333 by friction, so as to make radial adjustment of the elastic claw 1. Once the three elastic claws 1 are adjusted to the appropriate position, the thrust applied to the insertion rod 210 is increased, causing the elastic block to disengage from the slot, so that the insertion rod 210 can continue to be inserted into the insertion slot 110, and the insertion of the piston 100 and the piston rod 200 can be completed.

[0074] The above-described embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A piston docking device for a high-pressure contrast-enhancing injector, the high-pressure contrast-enhancing injector including a piston rod (200), the piston rod (200) being used for insertion and engagement with a piston (100) of a syringe, characterized in that, The piston docking device includes: An elastic claw (1) is connected to the end face of the piston (100) facing the piston rod (200). The proximal end of the elastic claw (1) near the piston (100) is an elastic connecting section (11), and the distal end is a locking section (12). The locking section (12) has a guide rib (13). At least three elastic claws (1) are symmetrically arranged around the axis of the piston (100). The piston rod (200) includes a plug rod (210) and a release sleeve (220) threaded onto the outside of the plug rod (210). The locking ring (2) is fixed on the plug rod (210). After the piston (100) is plugged into the piston rod (200), the locking ring (2) is used to lock in the locking section (12). The guide rib (13) has a guide slope (131) on the side away from the piston (100), and the locking ring (2) and the release sleeve (220) have a driving slope (21) on the side near the piston (100) that can fit with the guide slope (131). When the locking ring (2) or the release sleeve (220) moves toward the piston (100), the driving slope (21) can make the distal end of the elastic claw (1) gradually tilt outward along the radial direction through the guide slope (131). The piston docking device also includes a radial adjustment assembly (3) for synchronizing the radial movement of the three elastic jaws (1); The piston (100) has a vertical sliding cavity (120) and a horizontal sliding cavity (130) inside, the vertical sliding cavity (120) and the horizontal sliding cavity (130) are connected, and the radial adjustment assembly (3) includes: A slip ring (31) is slidably disposed in the vertical sliding cavity (120), and the outer wall of the slip ring (31) is an inclined surface; The slider (32) is slidably disposed in the transverse sliding cavity (130) and connected to the elastic claw (1) through a connecting block. The inner sidewall of the slider (32) has an inclined surface. The inclined surface of the slider (32) has the same inclination angle as the inclined surface of the slip ring (31) and fits together. A spring is provided between the slider (32) and the transverse sliding cavity (130). The piston (100) is provided with a transverse sliding hole (150) for the connecting block to slide. The transverse sliding hole (150) communicates with the transverse sliding cavity (130). The drive unit (33) is used to drive the slip ring (31) to move axially in the vertical sliding cavity (120) to drive the slider (32) to move radially in the transverse sliding cavity (130).

2. The piston docking device of the high-pressure contrast injection syringe according to claim 1, characterized in that, The bayonet section (12) has a notch (121) facing the inside of the piston (100), and the piston (100) has a insertion groove (110); After the piston (100) and the piston rod (200) are connected, the end of the insertion rod (210) abuts against the bottom of the insertion groove (110), the locking ring (2) is inserted into the recess (121), and the end face of the locking ring (2) facing away from the piston (100) abuts against the lower side wall of the recess (121).

3. The piston docking device of the high-pressure contrast injection syringe according to claim 2, characterized in that, The side wall of the insertion slot (110) is provided with an axial guide strip (160), and the insertion rod (210) is provided with a guide groove (211) that cooperates with the guide strip (160).

4. The piston docking device of the high-pressure contrast injection syringe according to claim 1, characterized in that, The slider (32) has a groove on its inclined surface, and the sliding ring (31) has a limiting block that slides in the groove on its inclined surface. The limiting block slides along the groove and will not detach from the groove.

5. The piston docking device of the high-pressure contrast injection syringe according to claim 3, characterized in that, The piston (100) has a vertical sliding hole (140) that connects the insertion groove (110) and the vertical sliding cavity (120). The driving part (33) includes: The driven block (331) is disposed in the vertical sliding cavity (120) and fixedly connected to the slip ring (31). The vertical sliding hole (140) has guide strips (160) on both the upper and lower sides. The cross-sectional profiles of the driven block (331) are the same. The screw (332) is rotatably inserted into the guide strips (160) on both sides of the vertical sliding hole (140), and the screw (332) passes through the driven block (331) and is threadedly connected. Driven wheel (333) is fixedly sleeved on the screw (332) and located below the guide bar (160) on the lower side. The side wall of the driven wheel (333) is flush with the end face of the guide bar (160) facing the inside of the insertion groove (110). The drive wheel (334) has a drive cavity (213) inside the plug rod (210). The drive wheel (334) is fan-shaped and three are symmetrically arranged. The outer wall of the drive wheel (334) is flush with the bottom of the guide groove (211). The plug rod (210) is rotatably provided with a rotating rod (335), and an air shaft (336) is fixedly sleeved on the rotating rod (335). The drive wheel (334) is sleeved on the air shaft (336).

6. The piston docking device of the high-pressure contrast injection syringe according to claim 5, characterized in that, Both the driven wheel (333) and the driving wheel (334) have anti-slip coatings on their sidewalls.

7. The piston docking device of the high-pressure contrast injection syringe according to claim 5, characterized in that, During the insertion process of the piston (100) and the piston rod (200), when the driving inclined surface (21) of the locking ring (2) just contacts the guide inclined surface (131), the distance between the end face of the locking ring (2) away from the piston (100) and the lower side wall of the notch (121) is H. The distance H is the same for piston rods (200) of different diameters.

8. The piston docking device of the high-pressure contrast injection syringe according to claim 7, characterized in that, The guide strip (160) below the driven block (331) has a slot on its end face facing the insertion groove (110). The insertion rod (210) has an elastic block located in the guide groove (211). When the insertion rod (210) is inserted into the insertion groove (110), the elastic block is engaged in the slot. The driven wheel (333) and the driving wheel (334) are at the same height. The distance between the end face of the locking ring (2) facing away from the piston (100) and the lower sidewall of the notch (121) is greater than H.

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