A projectile syringe convertible to a flush tube mode

Abstract

The application discloses a bullet injector which can be converted into a flushing pipe mode and relates to the technical field of medical devices.The bullet injector comprises an injection cylinder, a conical bin, a flushing pipe piston, a bullet piston, a push-pull rod, a connecting rod, a rotation guide mechanism, an elastic abutting component and a rotation guide component.When the push-pull rod pushes the flushing pipe piston and the bullet piston to move synchronously to the position where the bullet piston abuts against the conical bin, the push-pull rod is continuously pushed, the elastic abutting component is compressed under stress, the rotation guide component guides the rotation of the connecting rod, the rotation guide mechanism is driven to move, the flushing pipe space is communicated with the bullet space, and the bullet injector is converted into the flushing pipe mode.In the application, the linkage design of the double pistons (the bullet piston and the flushing pipe piston) driven by the push-pull rod and the cooperation of the rotation guide mechanism enable medical staff to automatically complete the continuous operation of "pushing the liquid medicine, triggering the piston by bottom touch, guiding the communication port and pushing the flushing liquid" by continuously pressing the push-pull rod with one hand.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, specifically to a pellet injector that can be converted to a flushing mode. Background Technology

[0002] In nuclear medicine imaging (such as renal dynamic imaging and SPECT imaging), the "pellet injection" technique is often used. This involves ligating a tourniquet proximal to the heart, rapidly injecting a small volume of high-concentration radiopharmaceutical intravenously, and then immediately releasing the tourniquet and flushing the tubing to allow the drug to pass through the target organ in the form of a "pellet" to observe blood perfusion.

[0003] In clinical practice, the injection of the "projectile" (administered medication) and subsequent catheter flushing must be performed closely and continuously. Delayed or untimely flushing can damage the "projectile's" shape, directly affecting imaging quality. Currently, medical staff typically use two separate syringes, one loaded with the imaging agent and the other with saline, connected via a three-way valve or by direct switching. This existing method has significant drawbacks: First, switching between the two syringes is cumbersome and time-consuming, and is highly susceptible to imaging failure due to delayed flushing; second, disconnecting the tubing during switching can introduce air, creating a risk of air embolism, or cause blood reflux and catheter blockage. Summary of the Invention

[0004] The purpose of this invention is to provide a projectile injector that can be converted to a punching mode, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a pellet injector that can be converted to a flushing mode, comprising an injection barrel, one end of which is provided with a conical chamber, and a flushing piston and a pellet piston are slidably installed in sequence inside the injection barrel. The flushing piston and the pellet piston divide the inner cavity of the injection barrel into a flushing space for storing flushing fluid and a pellet space for storing injection fluid, and the flushing space and the pellet space are normally separated.

[0006] A push-pull rod is fixedly connected to the punch piston, and a connecting rod is rotatably connected to the projectile piston. A sliding cavity is opened inside the push-pull rod, and the connecting rod passes through the sliding cavity and can slide along the axial direction.

[0007] A rotary conduction mechanism is provided between the connecting rod and the projectile piston, and an elastic abutment component and a rotary guide component are provided between the connecting rod and the sliding cavity;

[0008] When the push-pull rod pushes the punch piston and the projectile piston to move synchronously until the projectile piston abuts against the conical chamber, the push-pull rod continues to be pushed, the elastic abutment component is compressed by force, and the rotary guide component guides the connecting rod to rotate, thereby driving the rotary conduction mechanism to operate, so that the punch space and the projectile space are connected to switch to punch mode.

[0009] Furthermore, the rotary conduction mechanism includes a rotating part sleeved on the connecting rod near one end of the projectile piston, and an annular groove and a communication port formed on the end face of the projectile piston facing the punch piston.

[0010] The rotating part has a notch or groove around its periphery. The protruding part of the rotating part is engaged in the annular groove and can rotate axially with the connecting rod. The rotation of the connecting rod drives the rotating part to rotate, so that the notch or groove intermittently communicates with the communication port.

[0011] Furthermore, the elastic abutment assembly includes a compression spring disposed within the sliding cavity, with both ends of the compression spring elastically abutting against the end face of the connecting rod and the inner wall of the sliding cavity, respectively.

[0012] Under normal conditions, the compression spring has the potential energy to move the connecting rod toward the projectile piston.

[0013] Furthermore, the rotary guide assembly includes a rolling part embedded in the periphery of one end of the connecting rod that passes through the sliding cavity, and an irregularly shaped rolling groove formed on the inner wall of the push-pull rod.

[0014] The irregular rolling groove includes a straight rolling groove and a spiral rolling groove in sequence in the direction away from the projectile piston, and the rolling part can roll freely in the straight rolling groove and the spiral rolling groove.

[0015] During projectile injection, the rolling part rolls within the spiral rolling groove to drive the connecting rod to rotate; during tube flushing, the rolling part rolls within the straight rolling groove to prevent the connecting rod from rotating.

[0016] Furthermore, a receiving cavity is provided inside one end of the connecting rod that enters the sliding cavity, and a first vent hole and a second vent hole are respectively provided on the connecting rod on both sides of the receiving cavity along the axial direction.

[0017] A connecting pipe is fixed inside the receiving cavity. The connecting pipe has connecting grooves at both ends. A sliding part is fitted on the connecting pipe. The sliding part and the inner wall of the receiving cavity corresponding to the first vent hole form a buffer space. The buffer space is connected to the first vent hole.

[0018] Furthermore, a return spring is wound around the periphery of the connecting tube, and the two ends of the return spring elastically abut against the sliding part and the inner wall of the receiving cavity near the second vent.

[0019] Furthermore, an airbag mounting cavity is provided at one end of the projectile piston opposite to the punch piston, and an airbag is installed in the airbag mounting cavity; a transition cavity is provided at one end of the connecting rod adjacent to the projectile piston, and the transition cavity is connected to the second vent hole.

[0020] An inflation tube is fixedly connected to the airbag. The inflation tube passes through the projectile piston and extends into the transition cavity, so that the airbag and the second vent are in a through state.

[0021] During the flushing process, the air compressed by the relative movement of the push-pull rod and the connecting rod enters the airbag through the first vent, buffer space, connecting pipe, second vent, transition chamber and inflation pipe, causing the airbag to expand and protrude the projectile piston into the conical chamber.

[0022] Furthermore, the sliding part is embedded with a magnetic sheet, and the push-pull rod is provided with a plurality of magnet mounting slots at equal intervals along the length direction on one side corresponding to the second vent. The magnet mounting slots are embedded with permanent magnets, and the permanent magnets and the magnetic sheet form a magnetic force cooperation.

[0023] When the push-pull rod moves, the magnetic plates enter the magnetic field range of the permanent magnet in turn, causing the magnetic plates to drive the sliding part to move intermittently toward the direction of the second vent hole to change the volume of the buffer space.

[0024] Furthermore, when the magnetic sheet enters the magnetic field range between two adjacent permanent magnets, the magnetic attraction disappears, and the sliding part moves towards the first vent under the drive of the reset spring, squeezing the air in the buffer space into the airbag, causing the airbag volume to expand and contract in a pulse-like manner, so as to generate eddy current interference with the flushing fluid in the conical chamber.

[0025] Furthermore, a pressing part is fixedly connected to one end of the push-pull rod that protrudes from the injection cylinder, the outer diameter of the connecting rod is smaller than the outer diameter of the push-pull rod, and a needle connecting part for connecting an external injection needle is provided at the end of the conical chamber away from the injection cylinder.

[0026] Compared with the prior art, the beneficial effects of the present invention are:

[0027] 1. Seamless switching between pellet injection and flushing, ensuring imaging quality: Through the linkage design of the push-pull rod driving the dual pistons (pellet piston and flushing piston), and the cooperation of the rotary conduction mechanism, medical staff only need to continuously press the push-pull rod with one hand to automatically complete the continuous operation of "pump injection, piston bottoming trigger, connection port opening, and flushing fluid injection". This completely eliminates the time delay caused by switching two independent syringes or operating the three-way valve in existing technologies, ensuring timely flushing, avoiding the "pellet" shape being destroyed due to flushing delay, and significantly improving the success rate and image quality of nuclear medicine imaging.

[0028] 2. Continuous operation with closed tubing eliminates the risk of air embolism and blood reflux: Because the flushing fluid and injection fluid are pre-filled in the same syringe and separated by a piston, the entire pellet injection and flushing process is completed in one continuous operation within a completely closed tubing system. There is no need to disconnect the tubing or switch connections during the procedure, fundamentally avoiding the risk of air embolism caused by external air entering the bloodstream. It also prevents blood reflux and needle blockage problems due to tubing disconnection, thus improving the safety of clinical procedures.

[0029] 3. Physical negative pressure suction and eddy current interference achieve zero dead-angle emptying of the drug solution: When the projectile piston abuts against the inner wall of the conical chamber, a gap is formed. During flushing, the gas bladder expands, protruding the projectile piston and extending into the conical chamber, interfering with the flushing fluid and creating a eddy current. This eddy current effect can powerfully peel off and flush away the projectile injection fluid remaining in the dead corners of the conical chamber and on the end face of the projectile piston. Combined with the pressure of the flushing fluid, this achieves efficient and thorough emptying of the drug solution, avoiding the waste of expensive radiopharmaceuticals and ensuring the accuracy of the injected dosage.

[0030] 4. Magnetic-controlled pulse-type airbag expansion and contraction significantly improves flushing and cleaning efficiency: Through the magnetic force of the magnetic plate in the sliding part and the permanent magnets evenly spaced on the push-pull rod, combined with the reciprocating action of the return spring, the airbag can produce a pulse-type volume change of "instant expansion-rapid contraction". Compared with continuous single expansion or flushing, the pulse-type airbag expansion and contraction can generate pulsating eddies and micro-oscillations in the conical chamber, which greatly enhances the fluid shear force, making the flushing fluid more thorough in stripping and rinsing away residual medicine, and further improving the flushing effect. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the overall structure of a projectile injector that can be converted to a punching mode according to the present invention.

[0032] Figure 2 for Figure 1 A schematic diagram showing the positional relationship of the middle section after it has been cut open;

[0033] Figure 3 This is a schematic diagram showing the positional relationship of the push-pull rod, the projectile piston, and the punch piston after assembly in this invention;

[0034] Figure 4 for Figure 3 A schematic diagram showing the positional relationship of the middle section after it has been cut open;

[0035] Figure 5 for Figure 4 A magnified schematic diagram of the positional relationship of a local structure at point A in the middle;

[0036] Figure 6 for Figure 4 A magnified schematic diagram of the positional relationship of the local structure at point B in the middle section;

[0037] Figure 7 for Figure 3 Schematic diagram of the positional relationships of the central structure after explosive decomposition;

[0038] Figure 8 for Figure 7 A magnified schematic diagram of the positional relationship of the local structure at point K;

[0039] Figure 9 This is a schematic diagram showing the positional relationship between the push-pull rod and the pressing part after assembly in this invention.

[0040] The following are explanations of the reference numerals in the figures: 1. Pressing part; 2. Push-pull rod; 3. Injection cylinder; 4. Needle connection part; 5. Conical chamber; 6. Projectile piston; 7. Punch piston; 8. Connecting rod; 9. Connecting port; 10. Airbag; 11. Rotating part; 12. Notch groove; 13. Second vent; 14. Sliding cavity; 15. Magnet mounting groove; 16. Compression spring; 17. Straight rolling groove; 18. First vent; 19. Sliding part; 20. Return spring; 21. Receiving cavity; 22. Connecting groove; 23. Connecting tube; 24. Inflation tube; 25. Transition cavity; 26. Spiral rolling groove; 27. Rolling part. Detailed Implementation

[0041] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0042] Please see Figures 1-9This invention provides a technical solution: a pellet injector convertible to a flushing mode, comprising an injection cylinder 3, with a conical chamber 5 integrally formed and fixed to one end of the injection cylinder 3. The inner cavity of the conical chamber 5 is in communication with the inner cavity of the injection cylinder 3, and the outer diameter of the conical chamber 5 increases sequentially from the farthest point away from the injection cylinder 3. A needle connection portion 4 is provided at the end of the conical chamber 5 away from the injection cylinder 3 for connecting an external injection needle. Two pistons are fitted inside the injection cylinder 3, and the two pistons are defined sequentially from the farthest point away from the conical chamber 5 as a flushing piston 7 and a pellet piston 6. The flushing piston 7 and the pellet piston 6 can slide freely within the inner cavity of the injection cylinder 3. The space enclosed between the flushing piston 7 and the pellet piston 6 is used to store flushing fluid, such as physiological saline, and this space is defined as the flushing space. The space enclosed by the tube is used to store the injection solution. This space is defined as the pellet space. The tube space and the pellet space are normally separated. A push-pull rod 2 is coaxially fixedly installed on the tube piston 7. The push-pull rod 2 extends out of the end of the syringe 3 away from the conical chamber 5 and can slide freely along the axis of the syringe 3. A pressing part 1 is fixedly connected to the end of the push-pull rod 2 that extends out of the syringe 3. The pressing part 1 is used for medical personnel to press with their fingers so that the push-pull rod 2 can drive the tube piston 7 to slide in the inner cavity of the syringe 3. A connecting rod 8 is coaxially rotatably connected to the end face of the pellet piston 6 facing the tube piston 7. The outer diameter of the connecting rod 8 is smaller than the outer diameter of the push-pull rod 2. A blind hole-shaped sliding cavity 14 is coaxially opened at the end of the push-pull rod 2 facing the pellet piston 6. The connecting rod 8 can slide freely along the axis of the push-pull rod 2 in the sliding cavity 14.

[0043] Combination Figures 1 to 9 As shown, and please refer to the following: Figure 4 , Figure 5 and Figure 6A rotating part 11 is fixedly sleeved around the periphery of one end of the connecting rod 8 adjacent to the shot piston 6. At least one notch 12 is provided around the periphery of the rotating part 11. An annular groove is provided on the end face of the shot piston 6 facing the punch piston 7, allowing the protruding part of the rotating part 11 to engage. The protruding part of the rotating part 11 can rotate within the annular groove about the axial direction of the connecting rod 8. A through-hole 9 is provided on the end face of the shot piston 6. When the rotating part 11 rotates about the axial direction of the connecting rod 8, the notch 12 intermittently connects with the through-hole 9, thereby connecting the shot space and the punch space. A compression spring 16 is installed inside the sliding cavity 14. The two ends of the compression spring 16 elastically abut against the end face of the connecting rod 8 and the inner wall of the sliding cavity 14 respectively. Under normal conditions, the compression spring 16 has potential energy to move the connecting rod 8 toward the projectile piston 6. Two rolling parts 27 are embedded around the periphery of the end of the connecting rod 8 that enters the sliding cavity 14. The rolling parts 27 can rotate freely on the periphery of the connecting rod 8. The inner wall of the push-pull rod 2 is provided with a special-shaped rolling groove for the rolling parts 27 to engage. The special-shaped rolling groove includes a straight rolling groove 17 and a spiral rolling groove 26 in sequence from far away from the projectile piston 6. The rolling parts 27 can roll freely in the straight rolling groove 17 and the spiral rolling groove 26.

[0044] During pellet injection, medical personnel hold the syringe 3 and squeeze the pressing part 1 with their fingers. This causes the pressing part 1 to exert a compressive force on the push-pull rod 2, moving the push-pull rod 2 towards the inside of the syringe 3. Because the elastic resisting force of the compression spring 16 on the connecting rod 8 is greater than the resistance of the drug solution during pellet injection, the compression spring 16 will not deform significantly. The push-pull rod 2 will simultaneously drive the flushing piston 7 and the pellet piston 6 to move towards the conical chamber 5. When the end face of the pellet piston 6 abuts against the inner wall of the conical chamber 5, a gap is formed between the end face of the pellet piston 6 and the inner wall of the conical chamber 5. At this point, the pellet piston 6 cannot move further. However, as the pressing part 1 continues to move, the push-pull rod 2 continues to move. At this time, the compression spring 16... Compression begins at step 6, and simultaneously, the rolling part 27 rolls on the spiral rolling groove 26. When the rolling part 27 rolls in the spiral rolling groove 26, the inner wall of the spiral rolling groove 26 exerts a squeezing force on the rolling part 27, which in turn causes the rolling part 27 to drive the connecting rod 8 to rotate. When the connecting rod 8 rotates, it simultaneously drives the rotating part 11 to rotate, causing the notch groove 12 to gradually approach the connecting port 9 until the notch groove 12 and the connecting port 9 are in a through state. If the pressing part 1 is continued to be squeezed at this time, the shot piston 6 cannot continue to move, and the flushing piston 7 will move in the direction of the shot piston 6, thereby squeezing the flushing fluid in the flushing space from the connecting port 9 into the conical chamber 5, and then spraying it out from the needle connection part 4 to realize the flushing operation.

[0045] Combination Figures 1 to 9 As shown, and please refer to the following: Figures 5 to 8One end of the connecting rod 8, which penetrates into the sliding cavity 14, has a receiving cavity 21. The axis of the receiving cavity 21 is perpendicular to the axis of the connecting rod 8. A first vent 18, extending into the receiving cavity 21, is provided on one end face of the connecting rod 8 penetrating into the sliding cavity 14. The first vent 18 corresponds to one side of the axial direction of the receiving cavity 21. A second vent 13, extending into the receiving cavity 21, is provided on the other end face of the connecting rod 8. The second vent 13 corresponds to the other side of the axial direction of the receiving cavity 21. A connecting pipe 23 is fixedly connected inside the receiving cavity 21. The axis of the connecting pipe 23 is coaxial with the axis of the receiving cavity 21. Furthermore, both ends of the connecting pipe 23 are fixedly connected to the inner walls of both axial ends of the receiving cavity 21. Each end of the connecting pipe 23 has a... A connecting groove 22 is provided so that the axial ends of the connecting pipe 23 are not blocked by the inner wall of the receiving cavity 21. A sliding part 19 is fitted around the periphery of the connecting pipe 23. The sliding part 19 engages in the inner cavity of the receiving cavity 21, and its outer diameter is the same as the inner diameter of the receiving cavity 21. In addition, the sliding part 19 can slide freely on the periphery of the connecting pipe 23. The sliding part 19 and the inner wall of the receiving cavity 21 corresponding to the first vent 18 form a buffer space. The buffer space is connected to the first vent 18. A return spring 20 is wrapped around the periphery of the connecting pipe 23. The two ends of the return spring 20 elastically abut against the sliding part 19 and the inner wall of the receiving cavity 21 respectively in the direction of the elastic force. The return spring 20 is not set in the buffer space. Therefore, when the contents of the buffer space are in the buffer space, the return spring 20 is released. As the volume increases, the sliding part 19 will move towards the second vent 13 and exert a squeezing effect on the return spring 20, causing the return spring 20 to accumulate elastic potential energy. A recessed transition cavity 25 is provided at the lower end of the connecting rod 8 (the end adjacent to the projectile piston 6), which is connected to the second vent 13. A blind-hole-type airbag mounting cavity is provided on the lower end face of the projectile piston 6 (the end face opposite to the punch piston 7). An airbag 10 is installed in the airbag mounting cavity, and an inflation tube 24 is fixedly connected to the airbag 10. One end of the inflation tube 24 passes through the projectile piston 6 and extends into the transition cavity 25, so that the airbag 10 and the second vent 13 are in a through-hole state. Furthermore, a magnetic conductive sheet (not shown in the figure) is embedded in the sliding part 19. The magnetic conductive sheet is made of... Made of any material among iron, cobalt, and nickel, the push-pull rod 2 has multiple magnet mounting slots 15 on one side corresponding to the second vent 13. These magnet mounting slots 15 are evenly spaced along the length of the push-pull rod 2, and each magnet mounting slot 15 is embedded with a permanent magnet (not shown in the figure). The permanent magnet and the magnetic conductive sheet form a magnetic force cooperation. That is, when the push-pull rod 2 moves relative to the connecting rod 8, the magnetic conductive sheet will enter the magnetic field range of multiple permanent magnets in turn, and the magnetic conductive sheet will be intermittently attracted by the permanent magnets. This will cause the magnetic conductive sheet to drive the sliding part 19 to move towards the second vent 13, that is, the volume of the buffer space can change intermittently, and the volume of the airbag 10 can change intermittently by expanding and contracting.

[0046] Working principle of the invention:

[0047] During pellet injection, medical personnel hold the syringe 3 and squeeze the pressing part 1 with their fingers. This causes the pressing part 1 to exert a compressive force on the push-pull rod 2, moving the push-pull rod 2 towards the inside of the syringe 3. Because the elastic resisting force of the compression spring 16 on the connecting rod 8 is greater than the resistance of the drug solution during pellet injection, the compression spring 16 will not deform significantly. The push-pull rod 2 will simultaneously drive the flushing piston 7 and the pellet piston 6 to move towards the conical chamber 5. When the end face of the pellet piston 6 abuts against the inner wall of the conical chamber 5, a gap is formed between the end face of the pellet piston 6 and the inner wall of the conical chamber 5. At this point, the pellet piston 6 cannot move further. However, as the pressing part 1 continues to move, the push-pull rod 2 continues to move. At this time, the compression spring 16... Compression begins at step 6, and simultaneously, the rolling part 27 rolls on the spiral rolling groove 26. When the rolling part 27 rolls in the spiral rolling groove 26, the inner wall of the spiral rolling groove 26 exerts a squeezing force on the rolling part 27, which in turn causes the rolling part 27 to drive the connecting rod 8 to rotate. When the connecting rod 8 rotates, it simultaneously drives the rotating part 11 to rotate, causing the notch groove 12 to gradually approach the connecting port 9 until the notch groove 12 and the connecting port 9 are in a through state. If the pressing part 1 is continued to be squeezed at this time, the shot piston 6 cannot continue to move, and the flushing piston 7 will move in the direction of the shot piston 6, thereby squeezing the flushing fluid in the flushing space from the connecting port 9 into the conical chamber 5, and then spraying it out from the needle connection part 4 to realize the flushing operation.

[0048] During the flushing process, as the push-pull rod 2 continues to move, the connecting rod 8 and the injection cylinder 3 remain relatively stationary, and the rolling part 27 rolls within the straight section rolling groove 17. At this time, the connecting rod 8 does not rotate, and the connecting rod 8 and the push-pull rod 2 move relative to each other. This causes the air in the sliding cavity 14 to be compressed, and then enters the buffer space through the first vent hole 18. It then enters the connecting pipe 23 through the connecting groove 22 on the side of the connecting pipe 23 closest to the first vent hole 18, and subsequently enters the second vent through the connecting groove 22 on the other side of the connecting pipe 23. 13. Then it enters the transition chamber 25, and then enters the air bag 10 through the inflation tube 24, causing the air bag 10 to begin to expand. When the air bag 10 expands, the expanded part of the air bag 10 will protrude from the projectile piston 6 and extend into the conical chamber 5. This can interfere with the flushing fluid in the conical chamber 5, causing the flushing fluid to generate a vortex in the conical chamber 5. Under the action of the vortex, the flushing fluid can flush the projectile injection fluid remaining in some dead corners such as the conical chamber 5 and the projectile piston 6 to the needle connection part 4, and can enter the patient's blood vessels with the flushing fluid.

[0049] Furthermore, as the connecting rod 8 and the push-pull rod 2 continue to move relative to each other, the air in the sliding cavity 14 enters the buffer space. Since the airbag 10 expands to a certain extent and can no longer expand, the excess air remains in the buffer space. This excess air is then pushed towards the second vent 13, changing the internal volume of the buffer space and allowing it to accumulate. Additionally, as the push-pull rod 2 moves, the magnetic plates on the sliding part 19 alternately enter the magnetic field range of multiple permanent magnets, causing the magnetic plates to drive the sliding part 19 towards the second vent 13. This instantly increases the internal volume of the buffer space, causing the airbag 10 to instantly shrink. Then, the magnetic plates enter the magnetic field range between two adjacent permanent magnets, at which point the magnetic plates are subjected to... The magnetic attraction disappears, and driven by the elastic resistance of the return spring 20, the sliding part 19 moves rapidly toward the first vent 18, thereby squeezing the air in the buffer space into the airbag 10, causing the airbag 10 to expand rapidly. Thus, by moving the push-pull rod 2, the volume of the airbag 10 can achieve pulse-like expansion and contraction, thereby improving the vortex effect of the flushing fluid in the conical chamber 5, so that the flushing fluid and the shot injection fluid can be fully discharged from the syringe 3. In addition, in this embodiment, the shot injection fluid and the flushing fluid can be pre-filled in the flushing space and the shot space, or a filling part can be provided on the outer wall of the syringe 3, and the shot injection fluid and the flushing fluid can be flushed into the shot space and the flushing space by inserting an external syringe through the filling part. No specific restrictions are made here.

[0050] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A pellet injector convertible to a punching mode, characterized in that, The syringe includes a syringe (3), one end of which is provided with a conical chamber (5). A flushing piston (7) and a shot piston (6) are slidably installed inside the syringe (3). The flushing piston (7) and the shot piston (6) divide the inner cavity of the syringe (3) into a flushing space for storing flushing fluid and a shot space for storing injection fluid. The flushing space and the shot space are normally separated. A push-pull rod (2) is fixedly connected to the punch piston (7), and a connecting rod (8) is rotatably connected to the shot piston (6). A sliding cavity (14) is opened in the push-pull rod (2), and the connecting rod (8) passes through the sliding cavity (14) and can slide along the axial direction. A rotary conduction mechanism is provided between the connecting rod (8) and the projectile piston (6), and an elastic abutment component and a rotary guide component are provided between the connecting rod (8) and the sliding cavity (14); When the push-pull rod (2) pushes the punch piston (7) and the projectile piston (6) to move synchronously until the projectile piston (6) abuts against the conical chamber (5), the push-pull rod (2) continues to be pushed. The elastic abutment component is compressed by force, and the rotation guide component guides the connecting rod (8) to rotate, so as to drive the rotation conduction mechanism to act, so that the punch space and the projectile space are connected to switch to the punch mode.

2. A pellet injector convertible to a punching mode according to claim 1, characterized in that, The rotary conduction mechanism includes a rotating part (11) sleeved on the connecting rod (8) near one end of the projectile piston (6), and an annular groove and a connecting port (9) opened on the end face of the projectile piston (6) facing the punch piston (7). The rotating part (11) has a notch (12) on its periphery. The protruding part of the rotating part (11) is engaged in the annular groove and can rotate axially with the connecting rod (8). The rotation of the connecting rod (8) drives the rotating part (11) to rotate, so that the notch (12) intermittently communicates with the communication port (9).

3. A pellet injector convertible to a punching mode according to claim 1, characterized in that, The elastic abutment assembly includes a compression spring (16) disposed in the sliding cavity (14), and the two ends of the compression spring (16) elastically abut against the end face of the connecting rod (8) and the inner wall of the sliding cavity (14) respectively in the elastic force direction; Under normal conditions, the compression spring (16) has the potential energy to move the connecting rod (8) toward the projectile piston (6).

4. A pellet injector convertible to a punching mode according to claim 1, characterized in that, The rotary guide assembly includes a rolling part (27) embedded in the periphery of one end of the connecting rod (8) that passes through the sliding cavity (14), and a shaped rolling groove opened on the inner wall of the push-pull rod (2); The irregular rolling groove includes a straight rolling groove (17) and a spiral rolling groove (26) in sequence in the direction away from the projectile piston (6), and the rolling part (27) can roll freely in the straight rolling groove (17) and the spiral rolling groove (26); During projectile injection, the rolling part (27) rolls in the spiral rolling groove (26) to drive the connecting rod (8) to rotate. During tube flushing, the rolling part (27) rolls in the straight section rolling groove (17) so that the connecting rod (8) does not rotate.

5. A pellet injector convertible to a punching mode according to claim 1, characterized in that, The connecting rod (8) has a receiving cavity (21) inside one end that passes through the sliding cavity (14). The connecting rod (8) on both sides of the receiving cavity (21) has a first vent hole (18) and a second vent hole (13). A connecting pipe (23) is fixed inside the receiving cavity (21). The connecting pipe (23) has connecting grooves (22) at both ends. A sliding part (19) is fitted on the connecting pipe (23). The sliding part (19) and the inner wall of the receiving cavity (21) corresponding to the first vent (18) form a buffer space. The buffer space is connected to the first vent (18).

6. A pellet injector convertible to a punching mode according to claim 5, characterized in that, The periphery of the connecting tube (23) is wrapped with a return spring (20), and the two ends of the return spring (20) elastically abut against the inner wall of the sliding part (19) and the receiving cavity (21) near the second vent (13).

7. A pellet injector convertible to a punching mode according to claim 5, characterized in that, The projectile piston (6) has an airbag mounting cavity at one end opposite to the punch piston (7), and an airbag (10) is installed in the airbag mounting cavity; the connecting rod (8) has a transition cavity (25) at one end adjacent to the projectile piston (6), and the transition cavity (25) is connected to the second vent (13). An inflation tube (24) is fixedly connected to the airbag (10). The inflation tube (24) passes through the projectile piston (6) and extends into the transition cavity (25), so that the airbag (10) and the second vent (13) are in a through state. During the flushing process, the push-pull rod (2) moves relative to the connecting rod (8), and the compressed air enters the airbag (10) through the first vent (18), buffer space, connecting pipe (23), second vent (13), transition chamber (25) and inflation pipe (24), causing the airbag (10) to expand and protrude from the projectile piston (6) into the conical chamber (5).

8. A pellet injector convertible to a punching mode according to claim 7, characterized in that, The sliding part (19) is embedded with a magnetic sheet. The push-pull rod (2) has multiple magnet mounting slots (15) evenly spaced along the length direction on one side corresponding to the second vent (13). The magnet mounting slots (15) are embedded with permanent magnets. The permanent magnets and the magnetic sheet form a magnetic force cooperation. When the push-pull rod (2) moves, the magnetic plates enter the magnetic field range of the permanent magnet in turn, causing the magnetic plates to drive the sliding part (19) to move intermittently toward the direction of the second vent (13) to change the volume of the buffer space.

9. A pellet injector convertible to a punching mode according to claim 8, characterized in that, When the magnetic sheet enters the magnetic field range between two adjacent permanent magnets, the magnetic attraction disappears. The sliding part (19) moves towards the first vent (18) under the drive of the reset spring (20), squeezing the air in the buffer space into the airbag (10), causing the volume of the airbag (10) to expand and contract in a pulse-like manner, so as to generate eddy current interference on the flushing liquid in the conical chamber (5).

10. A pellet injector convertible to a punching mode according to claim 1, characterized in that, The push-pull rod (2) has a pressing part (1) fixed at one end of the syringe (3) through it. The outer diameter of the connecting rod (8) is smaller than that of the push-pull rod (2). The conical chamber (5) has a needle connecting part (4) for connecting an external injection needle at one end away from the syringe (3).

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