CN111789701B

CN111789701B - Injection device and exchange system comprising same

Info

Publication number: CN111789701B
Application number: CN202010848234.7A
Authority: CN
Inventors: 翁福清
Original assignee: Chengdu Serano Medical Technology Co ltd
Current assignee: Chengdu Serano Medical Technology Co ltd
Priority date: 2020-08-21
Filing date: 2020-08-21
Publication date: 2023-04-07
Anticipated expiration: 2040-08-21
Also published as: CN111789701A; WO2022037505A1

Abstract

The invention discloses an injection device and an exchange system comprising the same, and solves the technical problem that a plunger rod is easy to deform due to larger torsion when high-pressure medium exchange is carried out in the prior art, so that the high-pressure medium exchange process is blocked. The injection device comprises a syringe, a plunger rod and a plunger, wherein the plunger rod and the plunger are matched with the syringe, and the injection device also comprises a torque driving part connected with the proximal end of the plunger rod; the plunger rod comprises an output propelling section and an expanding section connected with the output propelling section; the expanding section extends to the proximal end of the plunger rod, and the proximal end sectional area of the expanding section is larger than the distal end sectional area. The exchange system comprises the injection device and a collecting device which is used in cooperation with the injection device and is used for collecting exchanged media. The injection device of the invention gradually increases the section diameter of the force application section of the plunger rod, thereby enhancing the torsion resistance of the plunger rod, preventing the plunger rod from being deformed due to stronger torsion and further effectively ensuring the smooth exchange of high-pressure media.

Description

Injection device and exchange system comprising same

Technical Field

The invention belongs to the technical field of medical instruments, and particularly relates to an injection device and an exchange system containing the same.

Background

Heart valve replacement is commonly used to treat severe heart valve pathologies, working with heart valve prostheses replacing the diseased valves. There are a wide variety of transcatheter implanted heart valve prostheses, one of which is an inflatable cuff heart valve prosthesis such as U.S. patent No. 2009/0088836. In the patent technology of chinese patent No. CN106794064a, when such a heart valve prosthesis is implanted in a body, it is necessary to fill a radiopaque medium in the cuff in advance, so that the position of the prosthetic valve can be determined by angiography. After the heart valve prosthesis is implanted and adjusted in place, the pre-filled media in the implant needs to be exchanged for a permanent filling media (a curing agent).

During medical procedures, a manual screw injector is often used to infuse a medium (a curing agent) under high pressure into the cuff of a heart valve prosthesis. The principle of the spiral injector is that medical staff manually rotates a plunger rod to enable the plunger rod to move relative to the axis of a cavity body in the cavity body, and therefore medium infusion under high pressure is achieved. Since the exchange system and the medium implanted in the body need to be exchanged under high pressure, the plunger rod will be subjected to a large torsion force during use, and when the nylon plunger rod is used, the plunger rod near the force application part is often deformed due to the torsion force. Resulting in the plunger rod not being able to advance smoothly in the syringe chamber, possibly resulting in media exchange failure.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: the utility model provides an injection device and contain this injection device's exchange system, solve prior art and be easy because of receiving the technical problem that great torsion warp when carrying out high pressure medium exchange plunger rod.

In order to achieve the purpose, the technical scheme adopted by the invention is as follows:

an injection device comprises a syringe, a plunger rod and a plunger, wherein the plunger rod and the plunger are matched with the syringe, and the injection device also comprises a torque driving part connected with the proximal end of the plunger rod;

the plunger rod comprises an output propelling section and an expanding section connected with the output propelling section; the enlarged section extends to the proximal end of the plunger rod; the proximal end of the expanded section has a larger cross-sectional area than the distal end.

Further, the sectional area of the expansion section is gradually increased from the far end to the middle end; or

The cross-sectional area of the expanded section increases progressively from the distal end to the proximal end.

Furthermore, a plurality of reinforcing ribs are arranged on the plunger rod.

Further, the injection cylinder comprises a first cylinder matched with the output propelling section and a second cylinder matched with the expanding section;

the proximal end of the first barrel is provided with a media loading inlet.

Furthermore, a limiting mechanism used for limiting the displacement stroke of the plunger relative to the injection cylinder is arranged between the torque driving part and the injection cylinder.

Further, the torque driving part is embodied as a handle;

the limiting mechanism comprises an elastic limiting block arranged on the inner wall of the handle and a limiting block accommodating groove arranged on the inner wall and used for accommodating the elastic limiting block, an injection tube step matched with the elastic limiting block is formed at the near end of the injection tube, and the elastic limiting block is abutted to the injection tube step for limiting.

Further, the torque driving part is embodied as a handle;

the limiting mechanism comprises a limiting baffle arranged on the handle, an injection tube step matched with the limiting baffle is formed at the near end of the injection tube, and the limiting baffle is abutted against the injection tube step for limiting.

Furthermore, a tenon is arranged on the limit baffle, and a mortise matched with the tenon is arranged on the handle;

the limiting baffle is formed by assembling at least two baffle blocks, the baffle blocks are provided with baffle block mortises and baffle block tenons which are mutually matched, and the baffle blocks are joggled into the limiting baffle.

Further, the handle passes through threaded connection with the injection tube, wherein, the handle is provided with the internal thread, and the injection tube near-end is provided with the external screw thread.

Furthermore, the handle is composed of at least two handle blocks;

the plunger rod is provided with a plunger rod rear seat, the handle block is provided with a rear seat embedding groove matched with the plunger rod rear seat, and the plunger rod is embedded in the rear seat embedding groove through the plunger rod rear seat;

the plunger rod is provided with a plunger rod convex block, the handle block is provided with a convex block embedding groove matched with the plunger rod convex block, and the plunger rod convex block is embedded in the convex block embedding groove.

A media exchange system comprising the injection device and a collection device for use with the injection device;

the far end of the injection cylinder is communicated with a delivery pipe and a pressure gauge;

the collecting device comprises a collecting cylinder and an input pipe connected to the collecting cylinder;

the collecting cylinder is fixedly connected to the injection cylinder;

a pressure relief valve is arranged on the input pipe;

a free piston matched with the inner wall of the collecting cylinder is arranged in the collecting cylinder;

the input pipe is provided with a regulating hole, the regulating hole is provided with a regulating hole plug, and the regulating hole is positioned between the pressure release valve and the collecting cylinder.

Compared with the prior art, the invention has the following beneficial effects:

the invention has scientific and reasonable structural design and convenient use, the plunger rod comprises the output propelling section and the expanding section, the sectional area of the near end of the expanding section is larger than that of the far end, the force application part is positioned at the near end of the expanding section, and the sectional area of the near end of the expanding section is increased, so that the torsion resistance of the plunger rod is enhanced, the plunger rod is prevented from being deformed due to stronger torsion, and the smooth medium exchange of an exchange system is further effectively ensured.

Drawings

Fig. 1 is a schematic view of the injection device of the present invention.

Fig. 2 is an enlarged view of a portion a in fig. 1.

Fig. 3 is an enlarged view of a portion B in fig. 1.

Fig. 4 is a schematic view of the external structure of the injection device of the present invention.

FIG. 5A is a schematic view of the syringe of the present invention.

FIG. 5B is a cross-sectional view of the syringe of the present invention.

Fig. 6 is an exploded view of the plunger, plunger rod and handle of the present invention.

Fig. 7 is a schematic view of the plunger and plunger rod construction of the present invention.

Fig. 8 isbase:Sub>A cross-sectional viewbase:Sub>A-base:Sub>A of fig. 7.

Fig. 9 is a cross-sectional view B-B of fig. 7.

Fig. 10 is a cross-sectional view C-C of fig. 7.

Fig. 11 is a cross-sectional view D-D of fig. 7.

Fig. 12 is a schematic structural diagram of a limiting mechanism according to an embodiment of the present invention.

Fig. 13 is a cross-sectional view of a spacing mechanism in an embodiment of the invention.

FIG. 14 is a cross-sectional view of an embodiment of the present invention showing a resilient stop member retracted.

FIG. 15 is a cross-sectional view of an elastic limiting block of a limiting mechanism according to an embodiment of the present invention.

Fig. 16 is a schematic structural diagram of a baffle block in another limiting mechanism according to an embodiment of the present invention.

FIG. 17 is a schematic view of an end of a handle adapted to a limit stop when another limit mechanism is used in accordance with an embodiment of the present invention.

FIG. 18 is a schematic view of the plunger rod, syringe barrel and handle engaged together using another limiting mechanism according to an embodiment of the present invention.

FIG. 19 is a cross-sectional view of the plunger rod, syringe barrel, handle in combination with another spacing mechanism in accordance with embodiments of the present invention.

FIG. 20 is a diagram of a switching system according to the present invention.

Fig. 21 is a schematic diagram of the external structure of the switching system of the present invention.

Wherein, the names corresponding to the reference numbers are:

1-injection device, 2-collection device, 3-injection tube, 4-plunger rod, 5-torque driving part, 6-limit baffle, 21-collection cylinder, 22-input tube, 23-input tube connector, 24-pressure relief valve, 25-free piston, 26-adjusting hole plug, 27-second cavity, 31-first cylinder, 32-second cylinder, 33-delivery tube, 34-connector, 35-pressure gauge, 36-loading inlet plug, 37-handle connecting part, 38-injection tube step, 39-first cavity, 310-injection tube section boundary line, 41-output propelling section, 42-expanding section, 43-plunger, 44-plunger sealing ring, 45-reinforcing rib, 46-plunger rod rear seat, 47-plunger rod lug, 48-plunger rod section boundary line, 51-rear seat embedding groove, 52-lug embedding groove, 53-handle block, 54-handle block mortise, 55-handle block tenon, 56-elastic limit block, 561-extension state, 562-contraction state, 57-plunger rod mortise, 58-mortise, 59-tenon block, 63-concave block, 65-handle block, 65-concave block, 64-inlet block, 65-concave block, 64-concave block inlet block, and loading baffle block inlet block

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation or be constructed and operated in a particular orientation, and thus, it should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; of course, the connection may be mechanical or electrical; alternatively, they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

As shown in fig. 1-4, the injection device provided by the present invention comprises a syringe barrel 3, a plunger rod 4 and a plunger 43, wherein the plunger rod 4 is matched with the syringe barrel 3, the plunger 43 is arranged at one end of the plunger rod 4, and the injection device further comprises a torque driving part 5 connected with the proximal end of the plunger rod 4; the plunger rod 4 comprises an output pushing section 41 and an expanding section 42 connected with the output pushing section 41; the enlarged section 42 extends to the proximal end of the plunger rod 4; the cross-sectional area of the proximal end of the expanded section 42 is greater than the cross-sectional area of the distal end of the expanded section 42. It should be noted that the proximal end of the enlarged section 42 referred to herein may refer to a section adjacent to the proximal end of the enlarged section 42, and does not necessarily refer to the end that is proximal; likewise, the distal end of the enlarged section 42 may represent a segment adjacent to the distal end of the enlarged section 42, and does not represent an end that is necessarily distal.

Specifically, the cross-sectional area of the expanding section 42 may gradually increase from the distal end to the middle end; alternatively, the cross-sectional area of the enlarged section 42 increases progressively from the distal end to the proximal end. Wherein the gradual increase may be gradual, abrupt, stepped, stepwise, or a combination of two or more of the foregoing, preferably with a gradually increasing cross-sectional area. Wherein the expanding section gradually increases from the distal end to the middle end, and the expanding section continuously extends from the middle end to the proximal end with the largest cross section. In a similar way, the inner cavity of the injection tube 3 is matched with the injection rod 4. The syringe 3 comprises a first barrel 31 fitted with an output pusher section 41, and a second barrel 32 fitted with an expansion section 42.

As shown in Figs. 5A and 5B, to adapt the syringe barrel 3 to the plunger rod 4, the syringe barrel 3 may be divided into a section with constant cross-section (first barrel 31), a section with increased cross-section (i.e. second barrel 32) and an external thread section (i.e. handle connection part 37) from the distal end to the proximal end. Specifically, the inner wall of the first barrel 31 forms a first cavity 39 (as shown in fig. 1), the first cavity 39 is a cylindrical cavity, the plunger 43 is located in the first cavity 39, and the plunger 43 is in close contact with the inner wall of the first barrel 31 to form a sliding seal fit. The plunger 43 is further provided with a plunger seal 44, and the plunger 43 is in close contact with the inner wall of the first barrel 31 through the plunger seal 44 to form a sliding sealing fit, i.e. the plunger seal 44 is effective when the plunger 43 is driven in the first chamber 39. The inner wall of the second cylinder 32 forms a cavity with an increasing cross-section in the direction away from the first cylinder 31, which cavity is adapted to the enlarged section 42. The cavity of the section is gradually enlarged and can be matched with the enlarged section 42 in an enlarging way, and can be gradually enlarged, suddenly enlarged, stepped enlarged, segmented gradually enlarged, segmented stepped enlarged and a combination of two or more increasing ways, preferably the sectional area is gradually enlarged.

As shown in fig. 1 and 7-11, the cross-sectional boundary 48 of the plunger rod 4 is formed at the junction of the output pushing section 41 and the expanding section 42 of the plunger rod 4. The cross-sectional area of the output propulsion section 41 may be constant or may be periodically changed or gradually increased. Preferably, the cross-sectional area of the output pusher section 41 remains constant. The cross-sectional area of the expanding section 42 progressively increases away from the output propulsion section 41. Preferably, the progressively larger enlarged section 42 increases conically, here at a half angle of 1 ° (cone angle of 2 °). Similarly, second cylinder 32 is fitted with enlarged section 42, and the cavity formed by the inner wall of second cylinder 32 is conical, preferably also having a cone half angle of 1 ° (cone angle is 2 °, as shown in fig. 5B). The cross-sectional shape of the output advancing section 41 of the plunger rod 4 is shown in fig. 8, and the cross-sectional shape of the expanding section 42 is shown in fig. 10.

As shown in fig. 1-6, the torque driver 5 is connected to the proximal end of the plunger rod 4 and the torque driver 5 is connected to the distal end of the barrel 3. The torque driving part 5 is embodied as a handle 5. The handle 5 is fixedly connected with the proximal end of the plunger rod 4. A plunger rod 4 is partly located in the barrel 3 and another part of the plunger rod 4 is located in the handle 5. Handle 5 and injection tube 3 pass through threaded connection, and wherein, handle 5 is provided with the internal thread, and 3 near-ends of injection tube are provided with the external screw thread. Specifically, the handle 5 is connected with the external thread section on the handle connecting part 37 of the injection cylinder 3 in a matching way. The handle 5 is driven to rotate, and the handle 5 drives the plunger rod 4 to rotate (i.e. the plunger 43 rotates), so that the plunger 43 moves along the axis of the syringe 3 in the syringe 3.

As shown in fig. 6, the handle 5 is composed of at least two handle blocks 53, the handle blocks 53 are provided with a plurality of handle block mortises 54 and handle block tenons 55, and the handle blocks 53 are connected into the handle 5 through the handle block mortises 54 and the handle block tenons 55. The connection of the two handle blocks 53 to form the handle 5 is not limited to a dovetail joint, but may be other connection means that can be realized, such as a threaded connection, a rivet connection, etc. Further, a concave table 59 is arranged between the inner wall of the thread in the handle block 53 and the edge of the handle block in the length direction, and the concave table 59 is arranged to avoid mutual interference when the two handle blocks 53 are assembled, so that the fitting degree of the two handle blocks 53 is improved.

The handle block 53 is also provided with a rear seat engagement groove 51 and a boss engagement groove 52 penetrating the middle of the rear seat engagement groove 51. The end of the plunger rod 4 remote from the plunger 43 is provided with a plunger rod back seat 46 and a plunger rod projection 47. The specific fixing mode of the plunger rod 4 and the handle block 5 is as follows: the plunger rod back 46 is adapted to the back engagement groove 51 on the handle piece 53, i.e. the plunger rod 4 engages in the back engagement groove 51 via the plunger rod back 46, so that the plunger rod 4 is connected to the handle piece 53 in a defined manner in the axial direction of the plunger rod 4. The plunger rod projection 47 is adapted to the projection engagement groove 52 of the handle piece 53, i.e. the plunger rod projection 47 is fitted in the projection engagement groove 52 of the handle piece 53, so that the plunger rod 4 is in limited connection with the handle piece 53 in the radial direction of the plunger rod 4. The plunger rod 4 and the handle block 53 may also be fixed in other ways that may be realized, such as riveting, direct bonding, etc.

The plunger rod rear seat 46 and the plunger rod projection 47 of the plunger rod 4 are arranged at the proximal end of the expanded section 42, when the handle 5 is driven to rotate, the torsion force of the handle 5 is transmitted to the proximal end of the expanded section 42 of the plunger rod 4, namely, the force application part of the plunger rod 4 is positioned at the proximal end, the proximal end has a large sectional area, and therefore, the torsion resistance of the plunger rod 4 is enhanced.

Further, in order to enhance the torsion deformation resistance of the plunger rod 4, the plunger rod 4 is further provided with a plurality of reinforcing ribs 45. Specifically, the rib sections are provided on the plunger rod 4, the cross section of the output pushing section 41 at the rib is shown in fig. 9, and the cross section of the expanding section 42 at the rib is shown in fig. 11.

The joint of the first cylinder 31 and the second cylinder 32 of the syringe 3 of the present invention forms a syringe cross-section boundary 310, and when the plunger 43 moves in the first cylinder 31, the plunger seal 44 is in close contact with the inner wall of the first cylinder 31 to form a sliding sealing fit, i.e. the plunger seal 44 on the plunger 43 is effective, so that the medium in the first cavity 39 does not leak from the side of the plunger 43.

When the plunger 43 moves from the sectional boundary 310 into the second cylinder 32, the plunger seal 44 on the plunger 43 cannot closely contact the inner wall of the second cylinder 32 due to the increase in the inner diameter of the second cylinder 32, so that the plunger seal 44 fails and the medium in the first chamber 39 leaks from the side of the plunger 43. To avoid leakage of the medium in this case, the outer wall of the transparent syringe 3 may be marked with the movable range of the plunger 43 (i.e. marked lines at the boundary of the syringe 3, not shown in the drawings), to alert the operator of the effective range of the plunger seal 44.

In addition to the marking at the dividing line, in some embodiments, a limiting mechanism for limiting the displacement stroke of the plunger 43 relative to the syringe 3 is provided between the torque driver 5 and the syringe 3 to prevent leakage of the medium in such a case. The limiting mechanism comprises an elastic limiting block 56 (shown in fig. 12-15) or a limiting baffle 6 (shown in fig. 16-19) positioned on the torque driving part 5, and an injection tube step 38 arranged on the injection tube 3, and the elastic limiting block 56 or the limiting baffle abuts against the injection tube step 38 to form limiting.

As shown in fig. 12-15, in an embodiment, the limiting mechanism includes an elastic limiting block 56 disposed on an inner wall of the handle block 53, a limiting block accommodating groove 57 disposed on the inner wall of the handle block 53 for accommodating the elastic limiting block 56, and a syringe step 38 formed at the proximal end of the syringe 3 and adapted to the elastic limiting block 56, wherein the elastic limiting block 56 limits the syringe by abutting against the syringe step 38.

As shown in fig. 12 and 13, an elastic limiting block 56 is disposed on an inner wall of an end of the handle block 53, the handle block 5 and the elastic limiting block 56 are formed as an integral structure, and the elastic limiting block 56 has an extending state 561 and a contracting state 562. When the elastic limit block 56 is not radially compressed, i.e., in a free state, the elastic limit block 56 is in an extended state 561, and a portion of the elastic limit block 56 extends out of the limit block receiving groove 57; when the elastic stopper 56 is radially compressed, the elastic stopper 56 is in a compressed state 562, and the entire elastic stopper 56 is accommodated in the stopper accommodating groove 57.

As shown in fig. 14, when the handle 5 with the plunger rod 4 is mounted to the syringe 3, the elastic stopper 56 contacts the external thread section of the syringe 3, the elastic stopper 56 is radially compressed into the stopper receiving groove 57 of the handle block 52, and the elastic stopper 56 is in a contracted state 562. As shown in FIG. 15, the resilient stop 56 is in the extended state 561 when the resilient stop 56 is not radially compressed. When the flexible stopper 56 is positioned against the syringe step 38, the flexible stopper 56 limits proximal movement of the handle 5 relative to the syringe 3 to the operator, thereby preventing leakage of the medium due to failure of the plunger seal 44.

In another embodiment, as shown in fig. 16-19, the limiting mechanism comprises a handle block 53 detachably connected with an annular limiting baffle 6, and a syringe step 38 formed at the proximal end of the syringe 3, wherein the limiting baffle 6 limits by abutting against the syringe step 38. Specifically, as shown in fig. 16 and 17, the limiting surface 65 of the limiting baffle 6 is provided with a baffle block tenon 64, the end surface of the handle block 53 is provided with a mortise 58, and the limiting baffle 6 and the handle block 53 are integrated by connecting the baffle block tenon 64 and the mortise 58, or by other connection manners that can be realized, such as threaded connection, riveting, and the like. The limiting baffle 6 is formed by assembling at least two baffle blocks 61, baffle block mortise 62 and baffle block tenon 63 which are matched are arranged on the baffle blocks 61, and the baffle blocks 61 are joggled into the limiting baffle 6. As shown in fig. 18 and 19, the plunger rod 4 is assembled with the two handle blocks 53 and then assembled with the external thread section (handle connecting part 37) of the syringe 3. When the end of the handle block 53 is located at the left side of the syringe step 38 (the external thread section of the syringe 3 is completely located in the handle 5), two stopper blocks 61 are assembled on the handle block 53 to form the handle 5 with a stopper. When the limiting surface 65 of the stopper block 61 abuts against the syringe step 38, the limiting surface 65 limits the proximal movement of the handle 5 relative to the syringe 3 towards the operator, thereby avoiding leakage of the medium due to failure of the plunger seal 44.

In some embodiments, as shown in fig. 1 and 2, a conveying pipe 33 may be connected to the first barrel 31, a connector 34 may be further disposed on the conveying pipe 33, the conveying pipe 33 is used to extend the length of the first barrel 31, meanwhile, the diameter of the conveying pipe is small and may extend into a narrow channel, the connector 34 is used to connect with a structure to be exchanged, and a pressure gauge 35 is further disposed on the conveying pipe 33 and is used to monitor the pressure value of the medium injection channel.

In some embodiments, to facilitate filling of the syringe barrel with a medium, as shown in FIG. 4, a medium loading inlet 320 may also be provided on the proximal end of the first barrel 31. The media loading inlet can be provided with a loading inlet plug 36, and the plugging and the opening of the media loading inlet are realized by plugging and unplugging the loading inlet plug 36. By arranging the medium loading inlet to load the medium, compared with a mode of sucking the medium into the first barrel 31 from the connector 34 by operating the plunger 43 to move, the medium loading time can be shortened, the phenomenon that redundant gas is mixed in the medium can be avoided, the plunger 43 is not required to be driven for many times to exhaust the gas in the medium, and the medium loading process is more convenient and faster. Of course, in other embodiments, the solution of driving the plunger 43 to suck the medium from the connection head 34 into the first cylinder 31 by the torque driving part 5 is not excluded, so that an additional opening on the cavity wall of the first cylinder 31 can be avoided, and the structure is simpler. The injection device has scientific and reasonable structural design and convenient use, is applied to the exchange system, and increases the section diameter of the force application part of the plunger rod, thereby enhancing the torsion resistance of the plunger rod, preventing the plunger rod from being deformed due to stronger torsion and further effectively ensuring the exchange system to smoothly exchange media.

The present invention provides a media exchange system in which an injection device has a plunger rod with high torque resistance. The exchange system is used for exchange of high pressure media in a medical environment, in particular between two different fluid media at high pressure. For example, the exchange system may be used to inject a permanent filling medium (a curing agent) into a balloon of a heart valve prosthesis while displacing a contrast agent (a contrast fluid) within the balloon. As shown in fig. 20 and 21, the present invention provides a media exchange system, which comprises an injection device 1 and a collection device 2 used in cooperation with the injection device 1; the far end of the syringe 3 is communicated with a delivery pipe 33 and a pressure gauge 35; the collecting device 2 comprises a collecting cylinder 21 and an input pipe 22 connected to the collecting cylinder 21; the collecting cylinder 21 is fixedly connected to the injection cylinder 3; a pressure release valve 24 is arranged on the input pipe 22; a free piston 25 matched with the inner wall of the collecting cylinder 21 is arranged in the collecting cylinder 21; the inlet pipe 22 is provided with a regulating hole, and the regulating hole is provided with a regulating hole plug 26, and the regulating hole is positioned between the pressure relief valve 24 and the collecting cylinder 21. The pressure relief valve 24 is used for keeping the liquid pressure from the first cavity 39 to the implanted part equal to or higher than the opening pressure 6atm of the pressure relief valve 24, and ensuring that the liquid pressure in the implanted part is equal to or higher than 6atm. The inner wall of the first cartridge 31 constitutes the first chamber 39 and the inner wall of the collection cartridge 21 constitutes the second chamber 27. The first cavity 39 is used to contain permanent filling medium (curing agent) and the second cavity 27 is used to contain exchanged developer.

The invention can arrange an input pipe connector 23 on the input pipe 22, and the input pipe connector 23 is responsible for connecting with the structure to be exchanged. The first barrel 31 of the injection device 1 is communicated with a delivery pipe 33, the delivery pipe 33 is provided with a connector 34, and the connector 34 is used for connecting with a structure to be exchanged. When the medium exchange in the implant is performed, the medium exchange system is communicated with the implant, and a closed cavity is formed between the plunger 43 and the free piston 25. The plunger 43 is driven by the handle 5 to move towards the conveying pipe 33, the curing agent in the first cavity 39 flows out from the medium exchange system towards the implant, meanwhile, the curing agent pushes the original medium in the implant to flow into the second cavity 27 from the implant towards the medium exchange system through the pressure release valve 24, and the liquid flowing into the second cavity 27 pushes the free piston 25 until the medium exchange in the implant is completed.

Since the medium exchange system and the medium implanted in the body need to exchange at high pressure, the plunger rod 4 is subjected to a higher torsion, especially at the proximal end of the plunger rod near the force application part. The medium exchange system effectively ensures that the medium exchange system smoothly exchanges the medium by configuring the plunger rod 4 with high torsion resistance. Specifically, the plunger rod 4 comprises an output propelling section 41 and an expanding section 42, the sectional area of the proximal end of the expanding section 42 is larger than that of the distal end, the force application part is positioned at the proximal end of the expanding section, and the sectional area of the proximal end of the expanding section is increased, so that the torsion resistance of the plunger rod is enhanced, the plunger rod is prevented from being deformed due to stronger torsion, and the medium exchange of the medium exchange system is effectively ensured. The main parts of the invention are made of the following materials: the plunger rod 3 is nylon (nylon), the handle 5 and the limit stop 6 are ABS, and the syringe 3 is PETG, which is not limited to the above materials, but may be other suitable materials. In order to further enhance the toughness of the handle 5, especially the toughness of the elastic limit block 56 in the handle 5, the handle 5 is made of PC + ABS.

The invention has scientific and reasonable structural design, can effectively prevent the plunger rod from deforming due to bearing larger torque force, can effectively ensure the smooth exchange of media, has strong practicability, and is suitable for being widely popularized and applied in the technical field and the similar technical fields.

Finally, it should be noted that: the above embodiments are only preferred embodiments of the present invention to illustrate the technical solutions of the present invention, but not to limit the technical solutions, and certainly not to limit the patent scope of the present invention; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention; that is, the technical problems to be solved by the present invention, which are not substantially changed or supplemented by the spirit and the concept of the main body of the present invention, are still consistent with the present invention and shall be included in the scope of the present invention; in addition, the technical scheme of the invention is directly or indirectly applied to other related technical fields, and the technical scheme of the invention is included in the patent protection scope of the invention.

Claims

1. An injection device, includes syringe, with syringe looks adapted plunger rod and plunger, its characterized in that: the torque driving part is connected with the proximal end of the plunger rod;

the plunger rod comprises an output pushing section and an expanding section connected with the output pushing section;

the enlarged section extends to the proximal end of the plunger rod, and the sectional area of the proximal end of the enlarged section is larger than that of the distal end of the enlarged section;

the sectional area of the expansion section is gradually increased from the far end to the middle end; or the cross-sectional area of the expansion section is gradually increased from the far end to the near end;

the plunger rod is provided with a plurality of reinforcing ribs;

the injection cylinder comprises a first cylinder matched with the output propelling section and a second cylinder matched with the expansion section; the proximal end of the first barrel is provided with a media loading inlet.

2. The injection device of claim 1, wherein: and a limiting mechanism used for limiting the displacement stroke of the plunger relative to the injection cylinder is arranged between the torque driving part and the injection cylinder.

3. The injection device of claim 2, wherein: the torque driving part is a handle;

stop gear is including locating elasticity stopper on the handle inner wall and set up in be used for holding on the handle inner wall elasticity stopper's stopper storage tank, the near-end of injection tube be formed with the injection tube step of elasticity stopper looks adaptation, the elasticity stopper through the top support in carry on spacingly on the injection tube step.

4. The injection device of claim 2, wherein: the torque driving part is a handle;

5. The injection device of claim 4, wherein:

the limiting baffle is provided with a tenon, and the handle is provided with a mortise matched with the tenon;

the limiting baffle is formed by assembling at least two baffle blocks, the baffle blocks are provided with baffle block mortises and baffle block tenons which are mutually matched, and the baffle blocks are formed by joggling.

6. The injection device of claim 3 or 5, wherein:

the handle with the injection tube passes through threaded connection, wherein, the handle is provided with the internal thread, the injection tube near-end is provided with the external screw thread.

7. The injection device of claim 6, wherein:

the handle is composed of at least two handle blocks;

8. A media exchange system, characterized by: comprising an injection device according to any of claims 1-7 and a collecting device for cooperation with the injection device;

the collecting cylinder is fixedly connected to the injection cylinder;

a pressure release valve is arranged on the input pipe;

the input pipe is provided with a regulating hole, the regulating hole is provided with a regulating hole plug, and the regulating hole is positioned between the pressure release valve and the collecting barrel.