Air filter and high pressure injector

Abstract

The present invention discloses an air filter device and a high-pressure syringe. The air filter device is applied to a high-pressure syringe, wherein the high-pressure syringe includes a syringe assembly, wherein the syringe assembly includes a barrel, a piston and a push rod mechanism, wherein the air filter device includes a mounting seat, wherein the surface of the mounting seat is concavely provided with a mounting position, wherein the mounting position is used to mount the barrel, wherein an air flow channel is provided inside the mounting seat, wherein one end of the air flow channel is connected to the mounting position, and the other end penetrates the surface of the mounting seat to form an air vent; and a filter membrane assembly, wherein the filter membrane assembly is provided on the surface of the mounting seat and covers the air vent, and is used to filter the air flow entering the air vent. The air filter device of the technical solution of the present invention is intended to prevent unclean substances in the air from contaminating the inner cavity of the barrel of the syringe assembly of the high-pressure syringe.

Description

[0001] Related Applications

[0002] This application claims priority to Chinese patent application No. 201920658615.1, filed on May 7, 2019, and entitled “AIR FILTER AND HIGH-PRESSURE INJECTOR”, which is hereby incorporated by reference. Technical Field

[0003] The present invention relates to the technical field of medical equipment, and in particular to an air filter device and a high-pressure injector with the air filter device. Background Art

[0004] There are many unclean substances in the air. The existing piston-type high-pressure syringes do not have an air filtering structure. The air directly enters the inner cavity of the barrel of the syringe assembly of the high-pressure syringe without being filtered. In this way, the unclean substances in the air will pollute the inner cavity of the barrel. When using this high-pressure syringe to inject patients, unclean substances may be injected into the human body, which will bring danger to the patients. Summary of the invention

[0005] The main purpose of the present invention is to provide an air filtering device, which is intended to prevent unclean substances in the air from contaminating the inner cavity of the barrel of a syringe assembly of a high-pressure syringe.

[0006] To achieve the above object, the present invention provides an air filter device, which is applied to a high-pressure injector. The high-pressure injector includes a syringe assembly, which includes a barrel, a piston and a push rod mechanism. The air filter device includes:

[0007] A mounting seat, wherein a mounting position is concavely formed on the surface of the mounting seat, the mounting position is used to mount the cylinder, an air flow channel is provided inside the mounting seat, one end of the air flow channel is connected to the mounting position, and the other end passes through the surface of the mounting seat to form an air hole; and

[0008] A filter membrane assembly is arranged on the surface of the mounting seat and covers the air holes, and is used for filtering the air flow entering the air holes.

[0009] In one embodiment of the present invention, the mounting seat comprises a seat body and a fixing plate;

[0010] The base body comprises a first surface and a second surface which are arranged opposite to each other, and the fixing plate covers the second surface;

[0011] The mounting position is recessed inward from the first surface and passes through the second surface. The second surface is provided with an air hole that passes through the first surface. The second surface is also provided with an exhaust groove. The two ends of the exhaust groove are respectively connected to the mounting position and the air hole. The fixing plate, the exhaust groove and the air hole form the air flow channel.

[0012] In one embodiment of the present invention, the fixing plate is provided with a clearance hole, the clearance hole is arranged corresponding to the installation position, and the push rod mechanism passes through the clearance hole and extends into the installation position so that the push rod mechanism is connected to the piston.

[0013] In one embodiment of the present invention, the air filter device further comprises a first sealing ring, which is arranged in the clearance hole and surrounds the side wall of the clearance hole, and is used to seal the gap between the push rod mechanism and the fixing plate.

[0014] In one embodiment of the present invention, the mounting seat further comprises a fixing ring, which is disposed in the mounting position and surrounds the side wall of the mounting position;

[0015] The fixing ring comprises a third surface and a fourth surface which are arranged opposite to each other, the fourth surface is arranged toward the fixing plate and abuts against the fixing plate, and the third surface is arranged away from the fixing plate and is used to carry the cylinder;

[0016] The side wall of the fixing ring is also provided with a vent hole penetrating the fixing ring, and the vent hole is connected with the exhaust groove and the installation position.

[0017] In one embodiment of the present invention, a clamping portion is protruding from the side wall of the mounting position above the fixing ring, and the clamping portion is extended along the circumference of the mounting position. The thickness of the clamping portion in the axial direction of the mounting position increases along the circumference of the mounting position.

[0018] In one embodiment of the present invention, the air filter device further comprises a second sealing ring, which is arranged at least partially around the inner side wall of the fixing ring and seals the gap between the third surface and the cylinder.

[0019] In one embodiment of the present invention, the inner side wall of the fixing ring is further concavely provided with a fixing groove, and the second sealing ring comprises a fixing portion and a sealing portion connected to each other, the fixing portion is fixed in the fixing groove, and the sealing portion is located outside the fixing groove and is arranged around the inner side wall of the fixing ring and blocks the gap between the third surface and the cylinder body;

[0020] The outer side wall of the fixing ring is provided with the vent hole communicating with the exhaust groove and the fixing groove.

[0021] In one embodiment of the present invention, the air filter device further comprises a floating top flange ring, the outer edge of the floating top flange ring is inserted into the fixing groove, and the fixing portion is clamped between a surface of the floating top flange ring facing away from the fixing plate and a side wall of the fixing groove;

[0022] A vent groove is also provided on the surface of the floating roof flange ring facing the fixing portion, and the vent groove communicates with the fixing groove and the mounting position.

[0023] The present invention also provides a high-pressure injector, which includes a syringe assembly and the air filter device. The syringe assembly includes a barrel, a piston and a push rod mechanism. The barrel is installed in the installation position of the air filter device and is connected to the air flow channel of the air filter device. The piston is movably arranged in the barrel, and the push rod mechanism extends into the installation position and is connected to the piston.

[0024] The technical solution of the present invention provides an air filter device, which has a mounting seat and a filter membrane assembly. The mounting seat is provided with a mounting position for mounting the barrel of the high-pressure syringe syringe assembly on the surface, and the mounting seat is provided with an air flow channel connecting the mounting position and the mounting seat surface, wherein the surface of the air flow channel mounting seat forms an air vent, and further, the filter membrane assembly is also covered on the air vent. In this way, when the barrel of the high-pressure syringe syringe assembly is installed in the mounting position, the inner cavity of the barrel can be connected with the outside world through the air flow channel, and when delivering liquid, the air flow from the outside can flow into the inner cavity of the barrel through the air flow. At this time, the filter membrane assembly can filter the air flow entering the air flow channel through the air flow hole, so as to prevent unclean substances in the air from following the air flow into the inner cavity of the barrel of the syringe assembly, and to prevent the inner cavity of the barrel of the syringe assembly from being polluted, thereby ensuring the cleanliness of the injection process, preventing unclean substances from being injected into the human body, and ensuring human safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0026] Figure 1 It is a schematic structural diagram of the high-pressure injector of the present invention;

[0027] Figure 2 for Figure 1 The internal structure diagram of the high-pressure injector;

[0028] Figure 3 for Figure 2 A top view of the high pressure injector in FIG.

[0029] Figure 4 for Figure 3 Middle AA section view;

[0030] Figure 5 for Figure 4 A magnified view of part A in FIG.

[0031] Figure 6 for Figure 4 Exploded view of the push rod mechanism and piston;

[0032] Figure 7 for Figure 6 Exploded view of the structure of the push rod mechanism.

[0033] Figure 8 for Figure 2 A schematic diagram of the structure of the middle mounting seat;

[0034] Fig. 9 for Figure 8 A schematic diagram of the three-dimensional structure of the middle seat from one perspective;

[0035] Fig.10 for Fig. 9 A schematic diagram of the three-dimensional structure of the middle seat from another perspective;

[0036] Fig.11 for Figure 4 A schematic diagram of the structural decomposition of the fixing ring, the floating top flange ring and the second sealing ring in the air filter device;

[0037] Fig.12 for Figure 4 A cross-sectional view of the retaining ring and the second sealing ring.

[0038] Description of Figure Numbers:

[0039]

[0040]

[0041] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0042] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0043] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0044] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0045] In addition, in the present invention, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text is to include three parallel solutions. Taking "A and / or B as an example", it includes solution A, or solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0046] The present invention provides an air filtering device 100 .

[0047] Reference Figures 1 to 5 The air filter device 100 in the embodiment of the present invention is applied to a high-pressure syringe 1000, the high-pressure syringe 1000 includes a syringe assembly 200, the syringe assembly 200 includes a barrel 210, a piston 230 and a push rod mechanism 250, the air filter device 100 includes a mounting seat 10, the surface of the mounting seat 10 is concavely formed with a mounting position 112, the mounting position 112 is used to install the barrel 210, an air flow channel (not marked) is provided inside the mounting seat 10, one end of the air flow channel is connected to the mounting position 112, and the other end passes through the surface of the mounting seat 10 to form an air vent 115; and a filter membrane assembly 30, the filter membrane assembly 30 is provided on the surface of the mounting seat 10, and covers the air vent 115, and is used to filter the airflow entering the air vent 115.

[0048] The technical solution of the present invention provides an air filter device 100, which has a mounting seat 10 and a filter membrane assembly 30, wherein the mounting seat 10 surface is concavely provided with a mounting position 112 for mounting the barrel 210 of the high-pressure syringe 1000 syringe assembly 200, and the mounting seat 10 is also provided with an air flow channel connecting the mounting position and the surface of the mounting seat 10 112, wherein the air flow channel forms an air vent 115 on the surface of the mounting seat 10, and further, the filter membrane assembly 30 is also covered on the air vent 115, so that when the barrel 210 of the high-pressure syringe 1000 syringe assembly 200 is installed, the air vent 115 is provided with a filter membrane assembly 30, and the air vent 115 is provided with a filter membrane assembly 30. When the syringe assembly 210 is installed to the installation position 112, the inner cavity 211 of the barrel 210 can be connected to the outside through the air flow channel. When delivering liquid, the air flow from the outside can flow into the inner cavity 211 of the barrel 210 through the air flow. At this time, the filter membrane assembly 30 can filter the air flow entering the air flow channel through the air vent 115 to prevent unclean substances in the air from following the air flow into the inner cavity 211 of the barrel 210 of the syringe assembly 200, thereby preventing the inner cavity 211 of the barrel 210 of the syringe assembly 200 from being contaminated, thereby ensuring the cleanliness of the injection process, preventing unclean substances from being injected into the human body, and ensuring human safety. When sucking liquid into the inner cavity 211, the flow direction of the air in the inner cavity 211 is opposite to the flow direction when delivering liquid. It should be noted that before the high-pressure injector 1000 performs injection and liquid delivery, the gas in the inner cavity 211 of the cylinder 210 must be discharged first. When the gas in the inner cavity 211 of the cylinder 210 is discharged, the movement direction of the high-pressure injector 1000 and the flow direction of the gas are consistent with those when delivering liquid.

[0049] It can be understood that the barrel 210 used in the high-pressure syringe 1000 in one embodiment of the present invention is a non-disposable consumable material. The barrel 210 can be reused many times. The top of the barrel 210 is provided with an exhaust liquid suction nozzle (not marked) and an injection nozzle (not marked) connected to the inner cavity 211. The exhaust liquid suction nozzle (not marked) is connected to the human body through a spring tube and an injection needle, and the injection nozzle is connected to the medicine (contrast agent, etc.) through a connecting tube. Therefore, the barrel 210 and the air filter device 100 can be reused for up to 24 hours, reducing the use of disposable consumables of medical equipment.

[0050] When the push rod mechanism 250 drives the piston 230 to move in the inner cavity 211 of the cylinder 210, the inner cavity 211 of the cylinder 210 is divided into two chambers, one of which stores the liquid for infusion, and the other chamber inhales gas to balance the internal air pressure of the piston 230. However, when the gas enters the chamber, if the air filter device 100 of the present application is not provided, the external air will contaminate the inner wall surface of the chamber. After the high-pressure injector 1000 completes the liquid delivery once, the liquid can be inhaled again to prepare for the next injection, and along with the movement of the piston 230, the contaminated inner wall surface will also follow the infused liquid into the human body.

[0051] Reference Figure 5 In one embodiment of the present invention, the filter membrane assembly 30 includes a filter membrane fixing seat 31 and a filter membrane 35. The upper surface of the filter membrane fixing seat 31 is provided with a through hole penetrating the filter membrane fixing seat 31. The lower end of the filter membrane fixing seat 31 is detachably inserted into the air vent 115. The filter membrane 35 is attached to the upper surface of the filter membrane fixing seat 31 and covers the through hole, thereby filtering the air entering the air vent 115. There are many specific detachable connection methods. For example, in one embodiment, the side wall of the lower end of the filter membrane fixing seat 31 is provided with a thread, and the inner side wall of the air vent 115 is also provided with a thread (not shown) correspondingly. The filter membrane fixing seat 31 is detachably inserted into the air vent 115 through the engagement of the thread.

[0052] In some embodiments, the filter membrane fixing seat 31 can also be made of a material with a certain degree of elasticity, for example, it can be plastic or rubber, and can be removably inserted into the air hole 115 by means of an interference fit between the lower end of the filter membrane fixing seat 31 and the air hole 115.

[0053] In some embodiments, the filter membrane 35 can be directly attached to the first surface 111 and cover the air vents 115 without providing a filter membrane fixing seat 31 .

[0054] Furthermore, in some embodiments, the filter membrane assembly 30 also includes a cover body 33 , which is disposed on the filter membrane fixing seat 31 , and the filter membrane 35 is clamped between the filter membrane fixing seat 31 and the cover body 33 .

[0055] Of course, the filter membrane 35 can also be adhered to the cover 33, or to the filter membrane fixing seat 31, as long as the filter membrane fixing cover is covered on the air vent 115 to ensure that the air entering the air flow channel is filtered. The technicians can select the appropriate filter membrane fixing method according to the specific situation, which will not be introduced in detail here.

[0056] In some embodiments, in order to facilitate the installation or removal of the cover 33, two lugs (not marked) are symmetrically arranged on the side wall of the cover 33 to increase the contact area between the cover 33 and the hand, so as to facilitate the workers to exert force during assembly and improve the efficiency of assembly. In addition, a through hole (not marked) is arranged in the cover 33, and a plurality of reinforcing ribs (not marked) are arranged in the through hole, which, on the one hand, increases the strength of the cover 33, and on the other hand, increases the protection of the filter membrane, so as to prevent the filter membrane from being broken due to the impact of airflow in the middle, thereby losing the filtering effect on the air.

[0057] Reference Figures 4 to 5 In one embodiment of the present invention, the mounting seat 10 includes a seat body 11 and a fixing plate 13; the seat body 11 includes a first surface 111 and a second surface 113 arranged opposite to each other, and the fixing plate 13 covers the second surface 113; the mounting position 112 is recessed inward from the first surface 111 and passes through the second surface 113, and the second surface 113 is provided with an air vent 115 passing through the first surface 111, and the second surface 113 is also provided with an exhaust groove 117, and the exhaust groove 117 connects the mounting position 112 and the exhaust hole 115; the fixing plate 13, the exhaust groove 117 and the exhaust hole 115 form the air flow channel.

[0058] In the technical solution of one embodiment of the present invention, the mounting seat 10 is set to include a seat body 11 and a fixing plate 13, wherein the fixing plate 13 covers the second surface 113 of the seat body 11, and forms an air flow channel with the exhaust groove 117 and the air vent 115 provided on the seat body 11. This structure can directly open the exhaust groove 117 and the air vent 115 on the second surface 113 of the seat body 11, and does not need to process a curved exhaust channel inside the mounting seat 10, which reduces the difficulty of processing. In addition, in order to prevent air from entering the air flow channel from the gap between the seat body 11 and the fixing plate 13, a sealing film 40 can also be provided between the seat body 11 and the fixing plate 13. When the seat body 11 covers the fixing plate 13, the sealing film 40 is compressed to improve the sealing of the air flow channel, and prevent air from entering the air flow channel through the seat body 11 and the fixing plate 13. In this way, it can be ensured that the air entering the air flow channel is filtered by the filter membrane assembly 30, and the filtering effect is guaranteed. It should be noted that the seat body 11 and the fixing plate 13 can be covered by screws or bolts, or by buckles. The technicians can select a suitable connection method according to the specific situation, which will not be described in detail here.

[0059] Reference Figures 8 to 11In one embodiment of the present invention, the fixing plate 13 is provided with a clearance hole, and the clearance hole is arranged corresponding to the mounting position 112. At least a portion of the push rod mechanism 250 passes through the clearance hole and extends into the mounting position 112, so that the push rod mechanism 250 is connected to the piston 230.

[0060] In the technical solution of one embodiment of the present invention, a clearance hole is provided on the upper surface of the fixing plate 13 and penetrates the fixing plate 13, so that the push rod mechanism 250 can pass through the clearance hole and connect with the piston provided on the cylinder 210. It can be understood that the shape and size of the clearance hole are adapted to the outer diameter of the push rod mechanism 250, providing a certain guiding effect for the piston 230 during the extension and retraction process.

[0061] Reference Figure 3 and Figure 4 In one embodiment of the present invention, the air filter device 100 includes a first sealing ring 50 disposed in the clearance hole. The first sealing ring 50 is disposed around the side wall of the clearance hole to seal the gap between the push rod mechanism 250 and the fixed plate.

[0062] In the technical solution of the present invention, a first sealing ring 50 is arranged around the clearance hole so that the first sealing ring 50 can abut against the side wall of the push rod mechanism 250, thereby preventing air from entering the installation position 112 from the gap between the push rod mechanism 250 and the fixed plate 13, thereby allowing unfiltered air to contact the inner wall of the cylinder 210 to contaminate the inner cavity 211 of the cylinder 210, thereby ensuring the filtering effect of the air filtering device 100.

[0063] Combined with reference Figure 4 , Figure 5 , Fig.11 and Fig.12 In one embodiment of the present invention, the mounting seat 10 further includes a fixing ring 15, which is disposed in the mounting position 112 and surrounds the side wall of the mounting position 112; the fixing ring 15 includes a third surface 151 and a fourth surface 153 which are arranged opposite to each other, the fourth surface 153 is arranged toward the fixing plate 13 and abuts against the fixing plate 13, and the third surface 151 is arranged away from the fixing plate 13 for supporting the cylinder 210; the side wall of the fixing ring 15 is further provided with a vent hole 155 which passes through the fixing ring 15, and the vent hole 155 connects the exhaust groove 117 and the mounting position 112.

[0064] In the technical solution of one embodiment of the present invention, the function of the fixing ring 15 is to support and fix the syringe assembly 200, and also has the functions of ventilation and sealing. Specifically, the side wall of the seat body 11 at the installation position 112 is provided with a mounting groove 119, and at least part of the fixing ring 15 is embedded in the mounting groove 119, so that the outer wall surface of the fixing ring 15 can abut against the inner wall surface of the installation position 112, which can increase the contact area between the fixing ring 15 and the seat body 11, and limit the radial deviation of the fixing ring 15, thereby improving the reliability of the fixing ring 15. When the fixing plate 13 is fixed to the seat body 11, the entire fixing ring 15 can also be firmly fixed between the seat body 11 and the fixing plate 13. By opening a vent hole 155 on the side wall of the fixing ring 15 and making the two ends of the vent hole 155 connected to the exhaust groove 117 and the mounting position 112 respectively, it can be ensured that the interior of the cylinder 210 fixed at the mounting position 112 is connected to the exhaust groove 117, ensuring that the air flow channel can be ventilated smoothly, and facilitating the exchange of air in the cylinder 210 with the outside air.

[0065] It should be noted that a sealing ring (not marked) may be provided on the third surface 151 of the fixed ring 15 and the side wall of the mounting groove 119, and a fourth sealing ring (not marked) may also be provided between the fourth surface 153 of the fixed ring 15 and the fixed plate 13 to seal the air flow channel to prevent air from entering the air flow channel from the gaps between the fixed ring 15 and the seat body 11, and between the fixed ring 15 and the fixed plate 13, so as to ensure that all air in the air flow channel is filtered by the filter membrane assembly 30, and then enters the air flow channel through the air vent 115, thereby ensuring a good filtering effect of the air filtering device 100.

[0066] Combined with reference Figures 8 to 10 In one embodiment of the present invention, a side wall of the mounting position 112 located above the fixing ring 15 is further provided with a clamping portion 1121, and the clamping portion 1121 is extended along the circumference of the mounting position 112, and the thickness of the clamping portion 1121 in the axial direction of the mounting position 112 increases along the circumference of the mounting position 112.

[0067] In the technical solution of one embodiment of the present invention, a clamping portion 1121 is protruded from the side wall of the mounting position 112, and the clamping portion 1121 is used to cooperate with the connecting ear provided on the cylinder 210, so as to fix the cylinder 210 on the mounting position 112. It should be noted that the thickness of the clamping portion 1121 along the axial direction of the mounting position 112 is increased along the circumferential direction of the mounting position 112, so that when the connecting ear cooperates with the clamping portion 1121, the tightness of the connection is gradually strengthened, thereby ensuring the reliability of the connection between the cylinder 210 and the mounting position 112.

[0068] In some embodiments, the retaining portion 1121 includes an inclined surface portion for the connecting ear to slide into and rotate inside, and a stop portion for stopping the cylinder 210 from rotating is formed at the end of the inclined surface.

[0069] In some embodiments, there can be two clamping parts 1121, and the two clamping parts 1121 are symmetrically arranged, and a stop part (not marked) is formed at the connection of the clamping parts 1121 for stopping the cylinder 210 from continuing to rotate. When the connecting ear of the cylinder 210 rotates to the stop part, the cylinder is fixed on the installation position 112.

[0070] Combined with reference Figure 4 , Figure 5 and Fig.11 In one embodiment of the present invention, the air filter device 100 further includes a second sealing ring 70 , which is at least partially disposed around the inner wall of the fixing ring 15 and blocks the gap between the third surface 151 and the cylinder 210 .

[0071] In a technical solution implemented in one embodiment of the present invention, a second sealing ring 70 is provided to seal the gap between the third surface 151 and the cylinder 210, thereby preventing air from entering the cylinder 210 directly from the gap between the third surface 151 and the cylinder 210 without passing through the air vent 115, thereby affecting the filtering effect of the air filtering device 100.

[0072] Combined with reference Figure 4 , Figure 5 and Fig.11 In one embodiment of the present invention, the inner side wall of the fixing ring 15 is further recessed with a fixing groove 157, and the second sealing ring 70 includes a fixing portion 73 and a sealing portion 71 connected to each other, the fixing portion 73 is fixed in the fixing groove 157, and the sealing portion 71 is located outside the fixing groove 157 and is arranged around the inner side wall of the fixing ring 15 to block the gap between the third surface 151 and the cylinder 210; the outer side wall of the fixing ring 15 is provided with the vent hole 155 connecting the exhaust groove 117 and the fixing groove 157.

[0073] In the technical solution of one embodiment of the present invention, the second sealing ring 70 is arranged in an annular shape, and the cross section of the second sealing ring 70 is roughly Y-shaped. In order to ensure the sealing effect of the second sealing ring 70, the sealing ring is arranged into a fixing portion 73 and a sealing portion 71. By further concavely providing a fixing groove 157 on the inner side wall of the fixing ring 15, the fixing portion 73 of the sealing ring is arranged in the fixing groove 157, and the sealing portion 71 is arranged around the inner side wall of the fixing ring 15, so as to ensure that the second sealing ring 70 can seal the gap between the third surface 151 and the cylinder 210, and prevent air from entering the inner cavity 211 in the cylinder 210 through the gap between the third surface 151 and the cylinder 210, thereby affecting the filtering effect of the air filter device 100.

[0074] Combined with reference Figure 4 , Figure 5 as well as Fig.11 In one embodiment of the present invention, the air filtering device 100 also includes a floating top flange ring 90, the outer edge of the floating top flange ring 90 is inserted into the fixing groove 157, and the fixing portion 73 is clamped between the surface of the floating top flange ring 90 facing away from the fixing plate 13 and the side wall of the fixing groove 157; the surface of the floating top flange ring 90 facing the fixing portion 73 is also provided with a ventilation groove 91, and the ventilation groove 91 connects the fixing groove 157 and the mounting position 112.

[0075] In the technical solution of one embodiment of the present invention, the outer edge of the floating roof flange ring 90 is inserted into the fixing groove 157, so that the lower end surface of the second sealing ring 70 is in contact with the upper surface of the floating roof flange ring 90, that is, the upper surface of the floating roof flange ring 90 supports the second sealing ring 70, and can prevent the lower end of the second sealing ring 70 from deforming toward the fixing plate 13, so as to ensure the sealing effect of the second sealing ring 90. In addition, the surface of the floating roof flange ring 90 facing the fixing portion 73 is also provided with a venting groove 91, which is connected to the fixing groove 157 and the mounting position 112. In this way, while ensuring the sealing effect of the second sealing ring 90, it can also reduce the resistance of gas passing through the second sealing ring 90 and the floating roof flange ring 90, so as to ensure smooth gas exchange.

[0076] Reference Figures 1 to 5 The present invention further provides a high-pressure injector 1000, which includes a syringe assembly 200 and an air filter device 100. The specific structure of the air filter device refers to the above embodiment. Since the high-pressure injector 1000 adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.

[0077] The syringe assembly 200 in this embodiment includes a barrel 210, which is installed in the installation position 112 of the air filter device 100 and communicates with the air flow channel of the air filter device 100. It should be noted that the high-pressure injector 1000 in the technical solution of the invention is used for imaging technology. The high-pressure injector 1000 includes a syringe assembly 200 and an air filter device 100. The air filter device 100 is fixedly connected to the base (not shown) of the high-pressure injector 1000 through a mounting plate (not shown) disposed below the air filter device 100, so that the air filter device 100 is fixed to the high-pressure injector 1000.

[0078] Specifically, the syringe assembly 200 includes a barrel 210, a piston 230 and a push rod mechanism 250, wherein the barrel 210 is fixed to a mounting position 112 recessed on the surface of the mounting seat 10, and a connecting ear (not marked) is protruding from the side wall of the barrel 210 to facilitate the fixation between the barrel 210 and the mounting position 112. An inner cavity 211 for accommodating medicine is formed inside the barrel 210, and a liquid outlet (not marked) connected to the inner cavity 211 is also provided on the top of the barrel.

[0079] In some embodiments, the syringe assembly 200 also includes a mounting cylinder 213 and a sleeve 215, and the sleeve 215 is sleeved on the surface of the barrel 210 to protect the barrel 210. The connecting ear is clamped on the end of the sleeve 215 and abuts against the second sealing ring 70. The end of the sleeve 215 near the opening is provided with a card table (not shown). The mounting cylinder 213 is sleeved on one side of the sleeve 215 near the opening end, and is sleeved on the outer side wall of the sleeve 215. The sleeve 215 is fixedly connected to the mounting cylinder 213 through the card table. The mounting cylinder 213 is used to install the sleeve 215 and the barrel 210 in the installation position 112. The mounting cylinder 213 can protect the barrel 210 and the sleeve 215 on the one hand, and can also facilitate the fixed installation of the barrel 210 and the sleeve 215 with the mounting seat on the other hand.

[0080] The cylinder 210 is provided with an inner cavity 211 for accommodating a developer, a piston 230 is disposed inside the inner cavity 211, a push rod mechanism 250 is connected to the piston 230, and the inner cavity 211 is communicated with the mounting position 112. When the high-pressure injector 1000 is working, the push rod mechanism 250 can be telescopically moved to drive the piston 230 to be telescopically moved in the inner cavity 211, so as to inject the developer in the inner cavity 211 into the human body under high pressure. It should be noted that the high-pressure injector 1000 in the technical solution of the present invention is not limited to being applicable to angiography technology, but can also be used for other purposes, such as injecting physiological saline.

[0081] It should be noted that when the push rod mechanism 250 performs telescopic movement, the fixed plate 13, the seat body 11, the sleeve 215, the mounting cylinder 213, the cylinder body 210, the fixed ring 15, the floating top flange ring 90, the first sealing ring 50, and the second sealing ring 90 are all fixed, and only the piston 230 moves in the inner cavity 211 of the cylinder body 210 along with the push rod mechanism 250. When the push rod mechanism 250 performs telescopic movement, the first sealing ring 50 always abuts against the outer wall of the push rod mechanism 250 to prevent air from entering the mounting position 112 during the movement of the push rod mechanism 250.

[0082] Reference Figures 4 to 7 The push rod mechanism 250 includes a rod body 251, a rotating shaft 252, a bearing 253, a connecting piece 254, a groove wheel 255, two driving pins 256, an end cover 257, two clamping blocks 258 and a dust cover 259. Among them, the end of the rod body 251 close to the piston 230 is detachably connected with the end cover 257, and the end cover 257 is provided with a mounting hole (not shown) for the lower end surface of the piston 230 to be inserted into the mounting hole. The end cover 257 is slidably provided with two clamping blocks 258, and the two clamping blocks 258 are moved closer or farther from each other to clamp or loosen the piston 230.

[0083] Specifically, the rod body 251 has a hollow structure inside, and a rotating shaft 252 is arranged inside the rod body 251. The rotating shaft 252 is fixedly connected to the groove wheel 255 through a connecting piece 254. The groove wheel 255 is provided with two second slide grooves (not shown), and a driving pin 256 is inserted in each second slide groove. The driving pin 256 passes through the first slide groove provided on the end cover 257 and is fixedly connected to the clamping block 258. The rotating shaft 252 rotates, driving the groove wheel 255 to rotate, and the groove wheel 255 drives the two sliders to move closer or farther through the two driving pins 256 to clamp or release the piston 230. In order to prevent dust from entering the end of the push rod mechanism 250, a dust cover 259 can also be connected to the end of the end cover 257.

[0084] The driving assembly 300 is provided at the bottom of the push rod mechanism 250. The driving assembly 300 is provided at one end of the push rod mechanism 250 away from the piston 230. The driving assembly 300 is respectively connected to the rotating shaft 252 and the rod body 251. The driving assembly 300 drives the rotating shaft 252 to rotate, and drives the two clamping members 254 to move closer to or away from each other through the connecting member 254, the groove wheel 255, and the driving pin 256 to clamp or release the piston 230. The driving assembly 300 is also connected to the rod body 251. The driving assembly 300 drives the rod body 251, the end cover 257, the dust cover 259 and all the components inside the rod body 251 to move up and down together, so that the piston 230 connected to the push rod mechanism 250 can move telescopically in the inner cavity 211 of the cylinder 210 to realize the liquid delivery or liquid suction operation.

[0085] Specifically, the drive assembly 300 includes a drive motor (not shown) and a drive shaft (not shown) connected to the drive motor in a transmission manner. The side wall of the drive shaft is provided with a thread. A nut is also sleeved on the side wall of the drive shaft. The nut is provided at one end of the rod body away from the end cap. The drive motor rotates and drives the nut to rotate relative to the drive shaft, so that the nut drives the rod body to rise or fall, so as to achieve the operation of delivering or sucking liquid. It should be noted that the rotating shaft 252 is connected to the drive shaft in a transmission member (not shown) so as to drive the two clamping members 258 to move closer to or away from each other when the piston 230 needs to be replaced, so as to achieve the clamping or loosening of the piston 230. It can be understood that in order to prevent the rotating shaft 252 from axially deviating during rotation, bearings 253 can be sleeved on both ends of the rotating shaft 252 to improve the accuracy of the rotational movement of the rotating shaft 252.

[0086] During the operation of the high-pressure injector 1000, the two clamping blocks 258 are always in the state of clamping the piston 230. Only when the piston 230 needs to be replaced, the two clamping members 258 are driven to move away from each other to loosen the piston 230 so as to facilitate taking out and replacing a new piston 230.

[0087] It should be noted that, in one embodiment of the invention, the first sealing ring 50 abuts against the outer side wall of the rod body 251 to prevent air from entering the mounting position 112 from the side wall of the rod body 251 when the rod body 251 moves. In addition, a fifth sealing ring 260 may be provided between the outer side wall of the groove wheel 255 and the inner wall of the rod body 251. The fifth sealing ring 260 is used to seal the interior of the push rod mechanism 250 to prevent air from entering the mounting position 112 from the interior of the push rod mechanism 250.

[0088] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A high pressure injector, Features The high-pressure injector comprises a syringe assembly, which comprises a barrel, a piston, a push rod mechanism and a drive assembly, wherein the drive assembly is arranged at one end of the push rod mechanism to drive the push rod mechanism to move relative to the barrel; wherein the barrel can be reused multiple times, and the high-pressure injector further comprises an air filter device, which comprises: The mounting seat comprises a seat body and a fixing plate, the seat body comprises a first surface and a second surface arranged opposite to each other, the fixing plate covers the second surface, the seat body is provided with a mounting position which is recessed inward from the first surface and passes through the second surface, the mounting position is used to mount the cylinder, the second surface is provided with an air vent which passes through the first surface, the second surface is also provided with an exhaust groove, the two ends of the exhaust groove are respectively connected to the mounting position and the exhaust hole; the fixing plate, the exhaust groove and the exhaust hole form an air flow channel, so that one end of the air flow channel is connected to the mounting position, and the other end passes through the surface of the mounting seat to form the exhaust hole; and A filter membrane assembly, the filter membrane assembly is disposed on the first surface of the base body and covers the air vents, and is used to filter the airflow entering the air vents; When the cylinder is installed at the installation position, the inner cavity of the cylinder can be connected with the outside through the air flow channel. When delivering liquid, the air flow from the outside can flow into the inner cavity of the cylinder through the air flow channel.

2. The high-pressure injector according to claim 1, It is characterized in that The fixing plate is provided with a clearance hole, and the clearance hole is arranged corresponding to the installation position. The push rod mechanism passes through the clearance hole and extends into the installation position, so that the push rod mechanism is connected with the piston.

3. The high-pressure injector according to claim 2, It is characterized in that The air filter device further comprises a first sealing ring, which is arranged in the clearance hole and surrounds the side wall of the clearance hole, and is used for sealing the gap between the push rod mechanism and the fixing plate.

4. The high-pressure injector according to claim 1, It is characterized in that The mounting seat further comprises a fixing ring, which is arranged in the mounting position and surrounds the side wall of the mounting position; The fixing ring comprises a third surface and a fourth surface which are arranged opposite to each other, the fourth surface is arranged toward the fixing plate and abuts against the fixing plate, and the third surface is arranged away from the fixing plate and is used to carry the cylinder; The side wall of the fixing ring is also provided with a vent hole penetrating the fixing ring, and the vent hole is connected with the exhaust groove and the installation position.

5. The high-pressure injector according to claim 4, It is characterized in that A clamping portion is also protruded from the side wall of the mounting position above the fixing ring. The clamping portion is extended along the circumference of the mounting position, and the thickness of the clamping portion in the axial direction of the mounting position increases along the circumference of the mounting position.

6. The high-pressure injector according to claim 4, It is characterized in that The air filter device further comprises a second sealing ring, which is arranged at least partially around the inner side wall of the fixing ring and blocks the gap between the third surface and the cylinder.

7. The high-pressure injector according to claim 6, It is characterized in that The inner side wall of the fixing ring is further provided with a fixing groove, and the second sealing ring comprises a fixing portion and a sealing portion connected to each other, the fixing portion is fixed in the fixing groove, and the sealing portion is located outside the fixing groove and is arranged around the inner side wall of the fixing ring and blocks the gap between the third surface and the cylinder body; The outer side wall of the fixing ring is provided with the vent hole communicating with the exhaust groove and the fixing groove.

8. The high-pressure injector according to claim 7, It is characterized in that The air filter device further comprises a floating top flange ring, the outer edge of which is inserted into the fixing groove, and the fixing portion is clamped between a surface of the floating top flange ring which faces away from the fixing plate and a side wall of the fixing groove; A vent groove is also provided on the surface of the floating roof flange ring facing the fixing portion, and the vent groove communicates with the fixing groove and the mounting position.

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