Piston butt joint device of high-pressure radiography syringe

Abstract

The invention discloses a piston butt joint device of a high-pressure radiography injector, which is used for inserting and matching a piston rod and a piston and comprises an elastic clamping jaw and a clamping ring. The elastic clamping jaws are connected to the end face of the side, facing the piston rod, of the piston, the near ends, close to the piston, of the elastic clamping jaws are elastic connecting sections, the far ends of the elastic clamping jaws are bayonet sections, guide rib plates are arranged on the bayonet sections, and at least three elastic clamping jaws are symmetrically arranged around the axis of the piston. The piston rod comprises an inserting rod and a tripping sleeve arranged on the outer side of the inserting rod in a threaded and sleeving mode, and the clamping ring is fixed to the inserting rod. The sides, away from the piston, of the guide rib plates are provided with guide slopes, the sides, close to the piston, of the clamping ring and the tripping sleeve are provided with driving slopes capable of being attached to the guide slopes, and the driving slopes can enable the far-end sides of the elastic clamping jaws to gradually incline outwards in the radial direction through the guide slopes. Quick insertion and convenient disassembly of the piston and the piston rod can be realized, and the connection reliability can be ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medical devices, in particular to a piston docking device of a high-pressure contrast medium injector. BACKGROUND

[0002] In the use process of the high-pressure contrast medium injector, the core execution components include the piston and the piston rod, wherein the piston is the component directly contacting the contrast medium, and in order to ensure the health safety and use reliability, a disposable consumable design is required; and the piston rod is usually designed as a reusable component because it does not directly contact the contrast medium and has high structural strength requirements. Therefore, before and after each use, the plug-in assembly and disassembly separation operation of the piston and the piston rod need to be completed.

[0003] At present, the piston and piston rod docking structure of the existing high-pressure contrast medium injector mostly adopts snap interference fit, pin fixing or threaded connection and the like. For example, when the snap interference fit is adopted, a large external force needs to be pressed during the plug-in process, which may push the piston, and in some scenarios, it may cause inconvenience and is inconvenient to disassemble; when the pin fixing method is adopted, an additional pin insertion and extraction operation is required, and the steps are complicated; when the threaded connection method is adopted, although the disassembly is relatively convenient, the reliability of the threaded connection may be reduced during the movement of the piston, and the piston rod has the risk of loosening or even falling off.

[0004] In summary, the existing piston and piston rod docking structure has the problems of inconvenient plug-in and disassembly and poor docking stability, and it is difficult to balance the dual requirements of quick operation and reliable connection, and there is an urgent need for a docking device that can realize the quick plug-in and convenient disassembly of the piston and the piston rod, so as to optimize the clinical operation process and improve the use performance of the high-pressure contrast medium injector. SUMMARY

[0005] The purpose of the present application is to provide a piston docking device of a high-pressure contrast medium injector, which solves the problems of inconvenient plug-in and disassembly and poor docking stability of the existing piston and piston rod docking structure.

[0006] To achieve this purpose, the following technical solutions are adopted: A piston docking device of a high-pressure contrast medium injector, the high-pressure contrast medium injector comprising a piston rod, the piston rod being used for plug-in cooperation with a piston of a needle cylinder, the piston docking device comprising: a resilient clamping jaw connected to an end face of the piston on a side facing the piston rod, the resilient clamping jaw being provided with at least three elastic connection segments close to a proximal end of the piston and clamping jaw segments on the distal end, the clamping jaw segments being provided with guide ribs, and the resilient clamping jaw being symmetrically arranged around the axis of the piston; A clamping ring is fixed on the insertion rod, and the clamping ring is used for clamping in the bayonet segment after the piston is inserted with the piston rod. The side of the guide rib plate away from the piston has a guide slope, the side of the clamping ring and the release sleeve close to the piston has a driving slope capable of being attached to the guide slope, and the driving slope can make the distal side of the elastic clamping jaw gradually tilt outward along the radial direction through the guide slope when the clamping ring or the release sleeve moves towards the side close to the piston.

[0007] Optionally, the bayonet segment has a notch towards the inside of the piston, and the piston has an insertion slot. When the piston is inserted with the piston rod, the end of the insertion rod abuts against the bottom of the insertion slot, the clamping ring is clamped into the notch, and the end face of the side of the clamping ring away from the piston abuts against the lower side wall of the notch.

[0008] 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 matched with the guide strip.

[0009] Optionally, the piston abutting device further comprises a radial adjustment assembly for synchronously moving the three elastic clamping jaws along the radial direction.

[0010] Optionally, the piston is internally provided with a vertical sliding cavity and a horizontal sliding cavity, the vertical sliding cavity is communicated with the horizontal sliding cavity, and the radial adjustment assembly comprises: A sliding ring is slidingly arranged in the vertical sliding cavity, and the outer side wall of the sliding ring is an inclined surface. A sliding block is slidingly arranged in the horizontal sliding cavity and connected with the elastic clamping jaw through a connecting block, the inner side wall of the sliding block has an inclined surface, the inclined surface of the sliding block and the inclined surface of the sliding ring have the same inclination angle and are attached to each other, a spring is arranged between the sliding block and the horizontal sliding cavity, the piston is provided with a horizontal sliding hole for sliding of the connecting block, and the horizontal sliding hole is communicated with the horizontal sliding cavity. A driving part is used for driving the sliding ring to move along the axial direction in the vertical sliding cavity, so as to drive the sliding block to move along the radial direction in the horizontal sliding cavity.

[0011] Optionally, the inclined surface of the sliding block is provided with a sliding groove, the inclined surface of the sliding ring is provided with a limiting block sliding in the sliding groove, and the limiting block slides along the sliding groove and does not come off the sliding groove.

[0012] Optionally, a vertical sliding hole is formed in the piston, the vertical sliding hole is communicated with the insertion slot and the vertical sliding cavity, the driving part comprises: a driven block arranged in the vertical sliding cavity and fixedly connected with the sliding ring, the vertical sliding hole has the guide strips on both sides, a screw rod rotatably arranged in the guide strips on both sides of the vertical sliding hole, the screw rod penetrates the driven block and is threadedly connected with the driven block, a driven wheel fixedly sleeved on the screw rod and located below the guide strip on the lower side, the side wall of the driven wheel is flush with the end face of the guide strip towards the inside of the insertion slot, a driving wheel, the insertion rod is internally provided with a driving cavity, the driving wheel is fan-shaped and symmetrically provided with three driving wheels, and the outer side wall of the driving wheel is flush with the bottom of the guide slot, wherein, the insertion rod is rotatably provided with a rotating rod, the rotating rod is fixedly sleeved with an air inflation shaft, and the driving wheel is sleeved on the air inflation shaft.

[0013] Optionally, the side walls of the driven wheel and the driving wheel are coated with an anti-skid coating.

[0014] Optionally, during the insertion of the piston rod and the piston rod, when the driving inclined surface of the clamping ring is in contact with the guide inclined surface, the distance between the end face of the clamping ring away from the piston and the lower side wall of the notch is H, and the H of the piston rods with different diameters is the same.

[0015] Optionally, the end face of the guide strip below the driven block towards the insertion slot is provided with a clamping groove, the insertion rod has an elastic clamping block, the elastic clamping block is located in the guide slot, and during the insertion of the insertion rod into the insertion slot, when the elastic clamping block is clamped into the clamping groove, the driven wheel and the driving wheel are at the same height, and the distance between the end face of the clamping ring away from the piston and the lower side wall of the notch is greater than H.

[0016] Compared with the prior art, the present application has the following beneficial effects: The piston and the piston rod are directly inserted into the piston when the piston and the piston rod are docked, the driving slope of the clamping ring arranged outside the plug-in rod is in contact with the guiding slope of the guiding rib plate in the inserting process, the clamping section can be inclined to the outside in the radial direction, the clamping section automatically rebounds after the plug-in rod is inserted in place, the clamping ring is clamped into the clamping section, and therefore the positions of the piston and the piston rod are fixed. The at least three symmetrical elastic clamping jaws can stably clamp the piston rod and avoid lateral deviation of the piston rod. When the piston and the piston rod are disassembled, the driving slope on the release sleeve is in contact with the guiding slope of the guiding rib plate by screwing the release sleeve, so that the clamping sections of the three elastic clamping jaws can be simultaneously inclined to the outside in the radial direction, and then the piston rod can be separated from the piston. The piston and the piston rod can be quickly plugged in and conveniently disassembled, the reliability of the connection between the piston and the piston rod can be ensured while the quick assembly and disassembly are realized. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without any creative labor.

[0018] The structures, proportions, sizes, etc. shown in the drawings of the present specification are only used to cooperate with the content disclosed in the present specification, to enable those skilled in the art to understand and read, and are not used to limit the conditions that the present application can be implemented, so they do not have technical significance. Any modification of structure, change of proportion relationship or adjustment of size, which does not affect the effects that the present application can produce and the purposes that the present application can achieve, should still fall within the scope of the technical content disclosed by the present application.

[0019] Figure 1 The structure schematic diagram of the piston and the piston rod after being plugged in in the embodiment one.

[0020] Figure 2 The structure sectional view of the piston and the piston rod after being plugged in in the embodiment one.

[0021] Figure 3 The structure schematic diagram of the piston and the piston rod being separated in the embodiment two.

[0022] Figure 4 The structure sectional view of the piston and the piston rod being separated in the embodiment two.

[0023] Figure 5 The structure sectional view of the piston and the piston rod after being plugged in in the embodiment two.

[0024] Figure 6 For Figure 5 A local enlarged view of the middle A part.

[0025] Illustration: 100, piston; 110, plug-in slot; 120, vertical sliding cavity; 130, horizontal sliding cavity; 140, vertical sliding hole; 150, horizontal sliding hole; 160, guide bar; 200, piston rod; 210, plug-in rod; 211, guide groove; 212, ring groove; 213, driving cavity; 220, tripping sleeve; 300, docking device; 1, elastic clamping jaw; 11, elastic connecting section; 12, bayonet section; 121, notch; 13, guide rib plate; 131, guide slope; 2, clamping ring; 21, driving slope; 3, radial adjustment assembly; 31, sliding ring; 32, sliding block; 33, driving part; 331, driven block; 332, screw; 333, driven wheel; 334, driving wheel; 335, rotating rod; 336, gas inflation shaft. DETAILED DESCRIPTION

[0026] In order to make the inventive purposes, features and advantages of the present application more obvious and easy to understand, the technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the accompanying drawings of the embodiments of the present application. Obviously, the embodiments described below are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0027] In the description of the present application, it should be understood that the terms "upper", "lower", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of 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 understood as a limitation on the present application. 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 can be a component disposed therebetween.

[0028] The embodiment of the present application provides a piston docking device of a high-pressure contrast injection syringe, the high-pressure contrast injection syringe comprises a piston and a piston rod, the piston docking device comprises elastic clamping jaws and a clamping ring, the elastic clamping jaws are connected to the end face of the piston on the side of the piston rod, the elastic clamping jaws are symmetrically provided with at least three elastic connecting sections close to the proximal end of the piston and clamping sections far from the proximal end, the clamping sections are provided with guide ribs, the piston rod comprises a plug-in rod and a decoupling sleeve which is sleeved on the outside of the plug-in rod, the clamping ring is fixed on the plug-in rod, and the clamping ring is used for clamping in the clamping section after the piston is plugged with the piston rod, wherein the side, away from the piston, of the guide rib is provided with a guide inclined surface, the side, close to the piston, of the clamping ring and the decoupling sleeve is provided with a driving inclined surface which can be attached to the guide inclined surface, and when the clamping ring or the decoupling sleeve moves towards the piston, the driving inclined surface can make the distal end side of the elastic clamping jaw tilt radially and gradually outward through the guide inclined surface.

[0029] In the piston docking device of the high-pressure contrast injection syringe provided by the embodiment of the present application, the piston rod can be directly inserted into the piston when the piston and the piston rod are docked, the driving inclined surface of the clamping ring fixed on the outside of the plug-in rod is attached to the guide inclined surface of the guide rib during the insertion process, the clamping section can be pushed to tilt radially and outward, the clamping section automatically rebounds after the plug-in rod is inserted in place, the clamping ring is clamped into the clamping section, and thus the positions of the piston and the piston rod are fixed. The at least three symmetrically arranged elastic clamping jaws can stably clamp the piston rod and avoid lateral deviation of the piston rod. When the piston and the piston rod are disassembled, the driving inclined surface on the decoupling sleeve is attached to the guide inclined surface of the guide rib by screwing the decoupling sleeve, so that the clamping sections of the three elastic clamping jaws can simultaneously tilt radially and outward, and thus the piston rod can be separated from the piston. The piston and the piston rod can be quickly plugged and conveniently disassembled, and the reliability of the connection between the piston and the piston rod can be ensured while achieving quick assembly and disassembly.

[0030] The technical solutions of the present application will be further described below with reference to the drawings and specific embodiments.

[0031] As shown in the drawings, Figures 1-6 The embodiment of the present application provides a piston docking device of a high-pressure contrast injection syringe, the high-pressure injection syringe is used in cooperation with a needle cylinder, the high-pressure injection syringe comprises a piston rod 200, the needle cylinder comprises a piston 100, and in use, the piston rod 200 is plugged and cooperated with the piston 100. The piston docking device in the embodiment is used in the scene of plugging and disassembling of the piston 100 and the piston rod 200, and can realize quick plugging and disassembling of the piston 100 and the piston rod 200. In the embodiment of the present application, at least the advantages of quick operation and reliable connection are achieved through the improvement of the structure.

[0032] Embodiment one: As shown in the drawings, Figure 1 , Figure 2As shown, in the embodiment, the piston abutting device comprises elastic clamping jaws 1 and a clamping ring 2. The elastic clamping jaws 1 are connected to the end face of the piston 100 on the side facing the piston rod 200, the elastic clamping jaws 1 have an elastic connecting section 11 near the proximal end of the piston 100, a clamping section 12 at the distal end, the clamping section 12 has a guide rib plate 13, and the elastic clamping jaws 1 are symmetrically arranged around the axis of the piston 100 and at least three; the piston rod 200 comprises a plug-in rod 210 and a trip sleeve 220 threaded on the outside of the plug-in rod 210, the clamping ring 2 is fixed on the plug-in rod 210, and the clamping ring 2 is used for clamping in the clamping section 12 after the plug-in of the piston 100 and the piston rod 200; wherein the side of the guide rib plate 13 away from the piston 100 has a guide inclined surface 131, the side of the clamping ring 2 and the trip sleeve 220 near the piston 100 has a driving inclined surface 21 capable of being attached to the guide inclined surface 131, and when the clamping ring 2 or the trip sleeve 220 moves towards the piston 100, the driving inclined surface 21 can make the distal end side of the elastic clamping jaw 1 tilt radially and gradually outward through the guide inclined surface 131.

[0033] Further, the clamping section 12 has a notch 121 facing the inside of the piston 100, and the piston 100 has a plug-in groove 110; after the plug-in of the piston 100 and the piston rod 200 is completed, the end of the plug-in rod 210 abuts against the groove bottom of the plug-in groove 110, the clamping ring 2 is clamped into the notch 121, and the end face of the side of the clamping ring 2 away from the piston 100 abuts against the lower side wall of the notch 121.

[0034] Specifically, the side of the piston 100 for plugging in the piston rod 200 is provided with a plug-in groove 110 with a circular cross section, and the diameter of the plug-in groove 110 can be equal to or greater than the diameter of the plug-in rod 210; the elastic clamping jaws 1 can be fixedly connected to the end face of the side of the piston 100 provided with the plug-in groove 110, and three are symmetrically arranged around the central axis of the plug-in groove 110; in actual implementation, it can be expanded to 4-6 according to the bearing requirement, and the embodiment preferably has three to balance the elastic deformation and the connection stability.

[0035] The piston rod 200 comprises a plug-in rod 210 and a trip sleeve 220, the trip sleeve 220 is threaded on the outside of the plug-in rod 210, the clamping ring 2 is fixed on the end of the plug-in rod 210 close to the plug-in into the plug-in groove 110, the outside of the trip sleeve 220 can be provided with anti-skid lines, which is convenient for the operator to rotate and apply force, and in some automatic injectors, the trip sleeve 220 can be driven to rotate by a motor; in the initial state, there is a gap between the clamping ring 2 and the end of the trip sleeve 220, and the outside edges of the side of the clamping ring 2 and the trip sleeve 220 close to the piston 100 are chamfered to form the driving inclined surface 21.

[0036] Meanwhile, the elastic claw 1 comprises an elastic connecting section 11 connected with the piston 100 and a bayonet section 12 connected with the elastic connecting section 11, and a guide rib plate 13 is connected to the outer side of the bayonet section 12, and the elastic connecting section 11, the bayonet section 12 and the guide rib plate 13 can be integrally formed. The elastic connecting section 11 can be made of medical-grade stainless steel or high-strength engineering plastic, and the elastic claw 1 can be radially opened and closed at the distal end through elastic deformation, so as to ensure the elastic recovery ability after repeated use. The bayonet section 12 is formed with a notch 121 on the outer side, which is used for clamping the clamping ring 2. The guide rib plate 13 is formed on the side of the bayonet section 12 away from the plug-in slot 110 and extends along the shape of the bayonet section 12. The guide rib plate 13 is provided with a stroke guide inclined surface 131 at the end away from the piston 100. The guide inclined surface 131 gradually inclines outward in the direction away from the piston 100, and the surface of the guide inclined surface 131 is polished to reduce the friction resistance when contacting the driving inclined surface 21. The angle of the driving inclined surface 21 is the same as that of the guide inclined surface 131, so as to ensure the uniformity of the force when the two are in contact. When the piston 100 is plugged with the piston rod 200, the end of the plug-in rod 210 with the clamping 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 plug-in rod 210 is gradually inserted into the plug-in slot 110. When the driving inclined surface 21 of the clamping ring 2 contacts the guide inclined surface 131, the axial pushing force is continuously applied, the driving inclined surface 21 slides along the guide inclined surface 131, a radial component force is generated, and the distal end of the elastic claw 1 inclines outward. Until the clamping ring 2 completely passes the guide rib plate 13, the elastic claw 1 is reset under the action of the elastic recovery force, the arc-shaped clamping groove of the bayonet section 12 is tightly attached to the clamping ring 2, at this time the clamping ring 2 is limited in the bayonet section 12, and the piston 100 and the piston rod 200 are stably connected. When the piston 100 and the piston rod 200 are disassembled, the release sleeve 220 is rotated towards the piston 100, and when the driving inclined surface 21 of the release sleeve 220 contacts the guide inclined surface 131, the sleeve is continuously rotated, the driving inclined surface 21 presses the guide inclined surface 131, a radial component force is generated, and the distal end of the elastic claw 1 inclines outward again. With the continuous movement of the sleeve, the bayonet section 12 of the elastic claw 1 gradually separates from the clamping ring 2, at this time the piston rod 200 is pulled away from the piston 100, the plug-in rod 210 can be pulled out of the elastic claw 1, and the piston 100 and the piston rod 200 are disconnected. The piston 100 and the piston rod 200 are quickly plugged and conveniently disassembled, and the reliability of the connection between the piston 100 and the piston rod 200 is ensured while achieving quick assembly and disassembly.

[0037] In an exemplary embodiment of the present application, 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 matched with the guide strip 160. When the insertion rod 210 is inserted into the insertion slot 110, the guide strip 160 is matched with the guide strip 160, which can ensure that the insertion rod 210 is vertically inserted into the insertion slot 110 along the axial direction; at the same time, through the cooperation of the guide strip 160 and the guide groove 211 during the insertion process and after the insertion is completed, the rotation of the insertion rod 210 around the axis can be limited, further improving the reliability of the connection between the piston 100 and the piston rod 200.

[0038] Embodiment two: The difference between this embodiment and embodiment one is that in this embodiment, the elastic clamping jaw 1 is movably connected to the piston 100, and the piston butt joint device further comprises a radial adjustment assembly 3 for synchronously moving the three elastic clamping jaws 1 along the radial direction. By adjusting the three elastic clamping jaws 1 along the radial direction, the compatibility of different size deviations of the clamping ring 2 can be realized. The clamping ring 2 of the piston rod 200 with different sizes has different outer diameters, so that the elastic clamping jaw 1 can be adjusted along the radial direction to realize the insertion of the piston 100 and the piston rod 200 with different sizes. The universality is significantly improved, and the equipment procurement and maintenance cost of the medical institution is reduced.

[0039] As shown in Figure 3 , Figure 4 , Figure 5 and Figure 6 , in this embodiment, a vertical sliding cavity 120 and a horizontal sliding cavity 130 are formed in the piston 100, the vertical sliding cavity 120 and the horizontal sliding cavity 130 are communicated, and the radial adjustment assembly 3 comprises: a sliding ring 31 slidably arranged in the vertical sliding cavity 120, the outer side wall of the sliding ring 31 being an inclined surface; a sliding block 32 slidably arranged in the horizontal sliding cavity 130 and connected with the elastic clamping jaw 1 through a connecting block, the inner side wall of the sliding block 32 having an inclined surface, the inclined surface of the sliding block 32 and the inclined surface of the sliding ring 31 having the same inclination angle and being fitted, a spring being arranged between the sliding block 32 and the horizontal sliding cavity 130, and a horizontal sliding hole 150 for the sliding of the connecting block being formed in the piston 100, the horizontal sliding hole 150 being communicated with the horizontal sliding cavity 130; a driving part 33 for driving the sliding ring 31 to move along the axial direction in the vertical sliding cavity 120, so as to drive the sliding block 32 to move along the radial direction in the horizontal sliding cavity 130.

[0040] Specifically, the vertical sliding cavity 120 is an annular inner cavity, the transverse sliding cavity 130 can be a radially extending strip-shaped inner cavity or also can be an annular inner cavity, the vertical sliding cavity 120 is communicated with the transverse sliding cavity 130; the sliding ring 31 can slide in the vertical sliding cavity 120 along the axial direction of the piston 100, and the sliding block 32 can slide in the transverse sliding cavity 130 along the radial direction of the piston 100, the transverse sliding cavity 130 can be matched with the sliding block 32; the transverse sliding hole 150 is located on the end face of the piston 100 connected with the elastic clamping jaw 1, the transverse sliding hole 150 is communicated with the transverse sliding hole 150 and extends along the radial direction, the connecting block slidingly arranged in the transverse sliding hole 150 connects the sliding block 32 and the elastic clamping jaw 1 together, when the sliding block 32 slides along the radial direction in the transverse sliding hole 150, the elastic clamping jaw 1 can be driven to slide together. The sliding ring 31 and the sliding block 32 are both provided with inclined surfaces, and the inclined surfaces of the two are abutted, when the driving part 33 drives the vertical sliding of the sliding ring 31, the radial component force can be applied to the sliding block 32 through the inclined surfaces, so that the sliding block 32 can be pushed to move along the radial direction, and then the sliding block 32 is driven to slide along the radial direction. The spring along the radial direction is arranged on the inner wall of the transverse sliding cavity 130 and the sliding block 32, when the driving force of the driving part 33 to the sliding ring 31 is removed, the sliding block 32 can be pushed to reset along the radial direction under the resilience of the spring.

[0041] It should be noted that the inclined surface of the sliding block 32 is provided with a sliding groove, the inclined surface of the sliding ring 31 is provided with the sliding block 32 sliding in the sliding groove, and the sliding block 32 slides along the sliding groove and does not come off the sliding groove. For example, the cross section of the sliding groove and the sliding block 32 can be T-shaped, so that the sliding ring 31 and the sliding block 32 can only relatively move along the inclined surface, and cannot come off. It is convenient to accurately adjust the elastic clamping jaw 1 along the radial direction.

[0042] Further, the piston 100 is provided with a vertical sliding hole 140, the vertical sliding hole 140 is communicated with the vertical sliding cavity 120 and the plug-in slot 110, and the driving part 33 comprises: a driven block 331 arranged in the vertical sliding cavity 120 and fixedly connected with the sliding ring 31, the vertical sliding hole 140 is provided with a guide strip 160 on both sides, and the cross section profile of the driven block 331 is the same; a screw rod 332 rotatably arranged in the guide strips 160 on both sides of the vertical sliding hole 140, the screw rod 332 penetrates the driven block 331 and is in threaded connection; a driven wheel 333 fixedly sleeved on the screw rod 332 and located below the guide strip 160 on the lower side, the side wall of the driven wheel 333 is flush with the end face of the guide strip 160 towards the inside of the plug-in slot 110; a driving wheel 334, the plug-in rod 210 is provided with a driving cavity 213 inside, the driving wheel 334 is fan-shaped and symmetrically provided with three driving wheels 334, and the outer side wall of the driving wheel 334 is flush with the groove bottom of the guide groove 211; The rotating rod 335 is arranged in the plug-in rod 210, and the gas expansion shaft 336 is fixedly arranged on the rotating rod 335.

[0043] Specifically, the driven block 331 is located in the plug-in slot 110, the vertical sliding hole 140 is communicated with the plug-in slot 110 and the vertical sliding cavity 120 and extends in the axial direction, and the sliding ring 31 can be driven to move in the axial direction when the driven block 331 moves in the axial direction. The guide strips 160 are arranged on the upper and lower sides of the vertical sliding cavity 120, and there is a gap between the lower guide strip 160 and the bottom surface of the piston 100. The driven block 331 is located between the two guide strips 160, and the screw rod 332 penetrates the upper guide strip 160, the driven block 331 and the lower guide strip 160 in sequence and is threadedly connected with the driven block 331. The driven wheel 333 is fixedly arranged on the screw rod 332 and located below the lower guide strip 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.

[0044] Meanwhile, the driving cavity 213 is arranged in the plug-in rod 210, and the distance between the top inner wall of the driving cavity 213 and the top of the plug-in rod 210 is equal to the thickness of the lower guide strip 160. The driving wheel 334 has a fan-shaped structure, each elastic clamping jaw 1 corresponds to one driving wheel 334, the side wall of the driving wheel 334 is flush with the groove bottom of the guide groove 211, and the side wall of the driven wheel 333 is flush with the end surface of the guide strip 160 facing the inside of the plug-in slot 110. Therefore, when the plug-in rod 210 is inserted into the plug-in slot 110, the driving wheel 334 reaches the same height as the driven wheel 333, and the driving wheel 334 abuts against the driven wheel 333. In addition, the rotating shaft is arranged in the plug-in rod 210, the gas expansion shaft 336 is connected to the rotating shaft, and the driving wheel 334 is connected to the gas expansion shaft 336. For example, the movable protrusion can be arranged on the side wall of the gas expansion shaft 336, the driving wheel 334 can be connected to the protrusion, and the gas expansion shaft 336 can drive the protrusion to move in the radial direction when the gas expansion shaft 336 is ventilated, so that the driving wheel 334 can be pushed in the radial direction, the abutting force between the driving wheel 334 and the driven wheel 333 can be increased, and the driving wheel 334 can drive the driven wheel 333 to rotate through friction when the driving wheel 334 rotates. When the driven wheel 333 rotates, the driven block 331 can be driven to move in the axial direction in the vertical sliding hole 140, so that the elastic clamping jaw 1 can be adjusted in the radial direction.

[0045] Further, the side walls of the driven wheel 333 and the driving wheel 334 are coated with an anti-skid coating. This is favorable for further increasing the friction between the driving wheel 334 and the driven wheel 333, and facilitating the driving wheel 334 to smoothly drive the driven wheel 333 to rotate.

[0046] In the embodiment of the present application, when the driving slope 21 of the clamping ring 2 is just in contact with the guide slope 131 during the insertion of the piston 100 and the piston rod 200, the distance between the end face of the clamping ring 2 away from the piston 100 and the lower side wall of the recess 121 is H, which is the same for the piston rods 200 with different diameters. Specifically, when the piston rod 200 is completely inserted into the insertion slot 110, the top end face of the insertion rod 210 is in abutment with the slot bottom of the insertion slot 110, and at this time, the end face of the clamping ring 2 away from the piston 100 is just in abutment with the lower side wall of the recess 121, which facilitates further ensuring the reliability of the insertion of the piston rod 200 and the piston 100.

[0047] For example, the guide strip 160 below the driven block 331 is provided with a clamping groove on the end face of the insertion slot 110, the insertion rod 210 is provided with a elastic clamping block in the guide groove 211, and when the elastic clamping block is clamped into the clamping groove during the insertion of the insertion rod 210 into the insertion slot 110, the driven wheel 333 and the driving wheel 334 are at the same height, and the distance between the end face of the clamping ring 2 away from the piston 100 and the lower side wall of the recess 121 is greater than H.

[0048] 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 slot 110, and when the top end face of the insertion rod 210 moves to the height of the top of the lower guide strip 160, the elastic clamping block is clamped into the clamping groove, which can provide a damping force for the insertion of the insertion slot 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 is in abutment with the side wall of the driven wheel 333, the air inflation shaft 336 is ventilated, and thus the driving of the driving wheel 334 by rotating the rotating rod 335 is facilitated, and the driving wheel 334 can drive the driven wheel 333 under the friction force, so as to facilitate the radial adjustment of the elastic clamping jaw 1. When the three elastic clamping jaws 1 are adjusted to the appropriate position, the pushing force applied to the insertion rod 210 is increased, the elastic clamping block is separated from the clamping groove, and thus the insertion rod 210 can be continuously inserted into the insertion slot 110, and the insertion of the piston 100 and the piston rod 200 is completed.

[0049] The above-described embodiments are only used to illustrate the technical solutions of the present application, rather than limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can be modified, or some technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A piston docking device for a high pressure contrast injector, the high pressure contrast injector comprising a piston rod (200) for plug fitting with a piston (100) of a syringe, characterized in that, The piston butt joint device comprises: A resilient clamping jaw (1) is connected to the end face of the piston (100) on the side facing the piston rod (200), the proximal end of the resilient clamping jaw (1) is a resilient connecting segment (11), and the distal end is a bayonet segment (12), the bayonet segment (12) is provided with a guide rib plate (13), and the resilient clamping jaw (1) is symmetrically provided with at least three around the axis of the piston (100); A clamping ring (2), the piston rod (200) comprises a plug-in rod (210) and a trip sleeve (220) threaded on the outside of the plug-in rod (210), the clamping ring (2) is fixed on the plug-in rod (210), and after the piston (100) is plugged into the piston rod (200), the clamping ring (2) is used for clamping in the bayonet segment (12); Wherein, the side of the guide rib plate (13) away from the piston (100) has a guide inclined surface (131), the side of the clamping ring (2) and the trip sleeve (220) close to the piston (100) is provided with a driving inclined surface (21) capable of being attached to the guide inclined surface (131), and when the clamping ring (2) or the trip sleeve (220) moves towards the piston (100), the driving inclined surface (21) can make the distal end side of the resilient clamping jaw (1) radially and gradually tilt outwardly through the guide inclined surface (131).

2. The piston docking device for a high pressure contrast injector of claim 1 wherein, The bayonet segment (12) has a notch (121) facing the inside of the piston (100), and the piston (100) has a plug-in groove (110); When the piston (100) is plugged into the piston rod (200), the end of the plug-in rod (210) abuts against the groove bottom of the plug-in groove (110), the clamping ring (2) is clamped into the notch (121), and the end face of the side of the clamping ring (2) away from the piston (100) abuts against the lower side wall of the notch (121).

3. The piston docking device for a high pressure contrast injector of claim 2, wherein, The side wall of the plug-in groove (110) is provided with an axial guide strip (160), and the plug-in rod (210) is provided with a guide groove (211) matched with the guide strip (160).

4. The piston docking device for a high pressure contrast injector of claim 3, wherein, The piston butt joint device further comprises a radial adjustment assembly (3) for synchronously moving the three resilient clamping jaws (1) radially.

5. The piston docking device for a high pressure contrast injector of claim 4 wherein, The piston (100) is internally provided with a vertical sliding cavity (120) and a horizontal sliding cavity (130), the vertical sliding cavity (120) communicates with the horizontal sliding cavity (130), and the radial adjustment assembly (3) comprises: A sliding ring (31) is slidingly arranged in the vertical sliding cavity (120), and the outer side wall of the sliding ring (31) is an inclined surface. A sliding block (32) is arranged in the transverse sliding cavity (130) and connected with the elastic clamping jaw (1) through a connecting block. An inclined surface is arranged on the inner side wall of the sliding block (32). The inclined surface of the sliding block (32) has the same inclination angle as the inclined surface of the sliding ring (31) and is in abutment with the inclined surface of the sliding ring (31). A spring is arranged between the sliding block (32) and the transverse sliding cavity (130). A transverse sliding hole (150) is arranged on the piston (100) for the sliding of the connecting block. The transverse sliding hole (150) is in communication with the transverse sliding cavity (130). A driving part (33) is arranged for driving the sliding ring (31) to move axially in the vertical sliding cavity (120) so as to drive the sliding block (32) to move radially in the transverse sliding cavity (130).

6. The piston docking device for a high pressure contrast injector of claim 5, wherein, An inclined surface is arranged on the sliding block (32). A limiting block is arranged on the inclined surface of the sliding ring (31) and slides in the sliding groove. The limiting block slides in the sliding groove and does not come off the sliding groove.

7. The piston docking device for a high pressure contrast injector of claim 5 wherein, A vertical sliding hole (140) is arranged on the piston (100). The vertical sliding hole (140) is in communication with the plug-in groove (110) and the vertical sliding cavity (120). The driving part (33) comprises: A driven block (331) is arranged in the vertical sliding cavity (120) and fixedly connected with the sliding ring (31). The vertical sliding hole (140) has the guide strips (160) on the upper and lower sides. The cross-sectional profile of the driven block (331) is the same. A screw rod (332) is rotatably arranged in the guide strips (160) on the upper and lower sides of the vertical sliding hole (140). The screw rod (332) penetrates the driven block (331) and is in threaded connection. A driven wheel (333) is fixedly arranged on the screw rod (332) and below the guide strip (160) on the lower side. The side wall of the driven wheel (333) is flush with the end face of the guide strip (160) facing the inside of the plug-in groove (110). A driving wheel (334) is arranged in the driving cavity (213) in the plug-in rod (210). The driving wheel (334) is in the shape of a sector and symmetrically provided with three driving wheels. The outer side wall of the driving wheel (334) is flush with the groove bottom of the guide groove (211). A rotating rod (335) is rotatably arranged in the plug-in rod (210). A gas expansion shaft (336) is fixedly arranged on the rotating rod (335). The driving wheel (334) is arranged on the gas expansion shaft (336).

8. The piston docking device for a high pressure contrast injector of claim 7, wherein, The side walls of the driven wheel (333) and the driving wheel (334) are coated with an anti-skid coating.

9. The piston docking device for a high pressure contrast injector of claim 7 wherein, During the plug-in process of the piston (100) and the piston rod (200), when the driving inclined surface (21) of the clamping ring (2) is in abutment with the guide inclined surface (131), the distance between the end face of the clamping ring (2) on the side 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) with different diameters.

10. The piston docking device for a high pressure contrast injector of claim 9, wherein, The guide bar (160) below the driven block (331) is provided with a clamping groove on the end face of the insertion slot (110), the insertion rod (210) has an elastic clamping block, the elastic clamping block is located in the guide groove (211), and when the elastic clamping block is clamped into the clamping groove during insertion of the insertion rod (210) into the insertion slot (110), the driven wheel (333) is at the same height as the driving wheel (334), and the distance between the end face of the clamping ring (2) away from the piston (100) side and the lower side wall of the notch (121) is greater than H.

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