Needle assembling and disassembling device of injector and injector

Abstract

The utility model discloses a syringe needle assembling and disassembling device and a syringe, and relates to the field of medical instruments.The syringe needle assembling and disassembling device is characterized in that a syringe needle pressing block is sequentially provided with a containing cavity, a first assembling hole allowing a syringe needle mounting base to pass through and a second assembling hole allowing a syringe needle to pass through in the axial direction; an annular groove is formed between the first assembly hole and the second assembly hole, the syringe body is sleeved with the needle head pressing block, when the needle head pressing block rotates around the syringe body in the circumferential direction till the second assembly hole and the connecting block of the needle head are staggered, the annular groove axially limits the connecting block, and the needle head pressing block is sleeved with the needle head limiting block and rotates relative to the needle head limiting block; the top of the needle limiting block is provided with a third assembly hole allowing the needle to pass through, the third assembly hole limits the needle in the circumferential direction, and the limiting pin is connected with the side wall of the needle pressing block and penetrates out of a through hole in the side wall of the needle limiting block. The limiting pin drives the needle pressing block to drive the needle to axially move, so that the needle and the needle mounting seat are smoothly assembled and disassembled, the needle replacement convenience is improved, and the needle replacement efficiency is improved.

Description

Technical Field

[0001] This application relates to the field of medical devices, and in particular to a needle loading and unloading device for a syringe and a syringe. Background Technology

[0002] When performing immunization, different needles need to be used for different recipients. Currently, the needle and syringe are sealed together by a conical surface. When changing needles, external tools are often needed to disassemble or install the needle and syringe, which is inconvenient and inefficient.

[0003] Therefore, improving the ease of needle replacement and increasing needle replacement efficiency are problems that need to be solved by those skilled in the art. Utility Model Content

[0004] The purpose of this application is to provide a needle loading and unloading device for a syringe and a syringe, in order to solve the problems of inconvenient needle replacement and low needle replacement efficiency.

[0005] To solve the above-mentioned technical problems, this application provides a needle loading and unloading device for a syringe. The syringe includes an injection barrel, a needle mounting seat connected to the injection barrel, and a needle connected to the needle mounting seat through a conical surface. A connecting block is connected around the bottom edge of the needle. The needle loading and unloading device includes a needle clamping block, a needle limiting block, and a limiting pin.

[0006] The needle clamping block is provided axially in the following order: a receiving cavity, a first mounting hole for the needle mounting seat to pass through, and a second mounting hole for the needle to pass through. An annular groove is formed between the first mounting hole and the second mounting hole. The injection cylinder is coaxially sleeved in the needle clamping block through the receiving cavity. When the needle clamping block rotates circumferentially around the injection cylinder until the second mounting hole is misaligned with the connecting block, the annular groove axially limits the connecting block. The needle clamping block is coaxially sleeved in the needle limiting block and rotates relative to it. The needle limiting block is connected to the outer wall of the injection cylinder. The top of the needle limiting block is provided with a third mounting hole for the needle to pass through. The third mounting hole is used for circumferential limiting of the needle. The side wall of the needle limiting block is provided with a through hole. The limiting pin is connected to the side wall of the needle clamping block and passes through the through hole. The size of the through hole meets the movement range of the limiting pin.

[0007] In one feasible embodiment, the side wall of the needle clamping block is provided with a handle, the handle is provided with a first mounting hole communicating with the receiving cavity, the outer wall of the injection cylinder is provided with a first guide groove, the first guide groove extends circumferentially along the injection cylinder and extends axially along the injection cylinder, one end of the limiting pin is inserted into the first mounting hole, and the other end of the limiting pin is inserted into the first guide groove and can slide in the first guide groove.

[0008] In one feasible embodiment, the device further includes a ball-head plunger. The handle is also provided with a second mounting hole communicating with the receiving cavity. The outer wall of the injection cylinder is provided with a second guide groove. The extension direction of the second guide groove is consistent with the extension direction of the first guide groove. Ball-head positioning grooves are provided at both ends of the second guide groove. One end of the ball-head plunger is inserted into the second mounting hole, and the ball head at the other end of the ball-head plunger can slide into or out of the ball-head positioning groove along the second guide groove.

[0009] In one feasible embodiment, the first mounting hole has a circular cross-section that matches the needle mounting base, the second mounting hole has a square cross-section that matches the edge of the connecting block, and the third mounting hole has a square cross-section that matches the needle.

[0010] In one feasible embodiment, a first connecting seat is connected to the bottom edge of the needle limiting block. The first connecting seat has a positioning hole. The side wall of the needle limiting block has a groove that extends along the axial direction of the needle limiting block, and one end of the groove extends to communicate with the positioning hole. A second connecting seat is provided on the circumferential surface of the injection cylinder. The second connecting seat has a threaded hole. The groove is used to engage a screw. One end of the screw is threadedly connected to the threaded hole through the positioning hole. The screw is used for circumferential limiting of the needle limiting block.

[0011] In one feasible embodiment, there are two handles, which are symmetrically arranged on the side wall of the needle clamping block, and the side wall of the needle limiting block is symmetrically provided with two through holes.

[0012] In one feasible embodiment, the first connecting seat is a first annular connecting seat arranged around the bottom edge of the needle limiting block, and a plurality of positioning holes are evenly distributed on the first annular connecting seat. The second connecting seat is a second annular connecting seat arranged around the circumference of the injection cylinder, and a plurality of threaded holes are evenly distributed on the second annular connecting seat, and the positioning holes and the threaded holes are arranged in a one-to-one correspondence.

[0013] In one feasible embodiment, the sidewall of the needle limiting block is further provided with a channel hole, one end of which communicates with the through hole, and the other end of which extends to the top surface of the needle limiting block and communicates with the outside.

[0014] This application also provides a syringe, including an injection barrel, a needle mounting base connected to the injection barrel, a needle connected to the needle mounting base via a conical surface, and the needle loading and unloading device.

[0015] In one feasible embodiment, the bottom inner wall of the needle mounting seat is provided with an internal thread, and the top outer wall of the injection cylinder is provided with an external thread. The needle mounting seat and the injection cylinder are engaged with each other through the internal thread and the external thread.

[0016] This application provides a needle loading and unloading device for a syringe. The syringe includes a syringe body, a needle mounting seat connected to the syringe body, and a needle connected to the needle mounting seat via a conical surface. A connecting block is connected around the bottom edge of the needle. The needle loading and unloading device includes a needle clamping block, a needle limiting block, and a limiting pin. The needle clamping block has a receiving cavity, a first mounting hole for the needle mounting seat to pass through, and a second mounting hole for the needle to pass through in sequence along the axial direction. An annular groove is formed between the first mounting hole and the second mounting hole. The syringe body is coaxial with the receiving cavity. The needle clamping block is fitted inside the needle clamping block. When the needle clamping block rotates circumferentially around the syringe barrel until the second mounting hole misaligns with the connecting block, the annular groove axially limits the connecting block. The needle clamping block is coaxially fitted inside the needle limiting block and rotates relative to it. The needle limiting block is connected to the outer wall of the syringe barrel. The top of the needle limiting block has a third mounting hole for the needle to pass through, which is used for circumferential limiting of the needle. The side wall of the needle limiting block has a through hole, and a limiting pin is connected to the side wall of the needle clamping block and passes through the through hole. The size of the through hole meets the movement range of the limiting pin. By setting a needle loading and unloading device on the syringe, only the limiting pin needs to be driven to make the needle clamping block move the needle axially, which makes it easy to disassemble or install the needle and the needle mounting seat, saving effort, improving the convenience of needle replacement, and increasing needle replacement efficiency.

[0017] The syringe provided in this application includes the aforementioned needle loading and unloading device, with the effects described above. Attached Figure Description

[0018] To more clearly illustrate the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 A structural diagram of a syringe provided in an embodiment of this application;

[0020] Figure 2 A schematic diagram of a needle mounting base provided in an embodiment of this application;

[0021] Figure 3 A cross-sectional view of a needle loading and unloading device provided in an embodiment of this application;

[0022] Figure 4 A schematic diagram of a needle loading and unloading device assembled with a syringe, provided for an embodiment of this application;

[0023] Figure 5 A schematic diagram of another needle loading and unloading device provided in an embodiment of this application, assembled with a syringe;

[0024] Figure 6 A schematic diagram of a needle clamping block assembled on a syringe, provided for an embodiment of this application;

[0025] Figure 7 A structural diagram of a needle limiting block provided in an embodiment of this application;

[0026] Figure 8 A cross-sectional view of a needle clamping block provided in an embodiment of this application;

[0027] Figure 9 A side view of a needle clamping block provided in an embodiment of this application;

[0028] Figure 10 A top view of a needle clamping block provided in an embodiment of this application;

[0029] Figure 11 A structural diagram of another syringe provided in an embodiment of this application;

[0030] Figure 12 This is a schematic diagram of an injection cylinder provided in an embodiment of this application;

[0031] The reference numerals in the attached drawings are as follows: 1-Injection barrel, 2-Needle mounting seat, 3-Needle, 4-Piston rod, 5-Needle clamping block, 6-Needle limiting block, 7-Limiting pin, 8-Ball plunger, 101-First guide groove, 102-Second guide groove, 103-Ball positioning groove, 104-Second connecting seat, 1041-Threaded hole, 301-Connecting block, 501-Receiving cavity, 502-First assembly hole, 503-Second assembly hole, 504-Annular groove, 505-Handle, 5051-First mounting hole, 5052-Second mounting hole, 601-Third assembly hole, 602-Through hole, 603-First connecting seat, 6031-Positioning hole, 604-Groove, 605-Channel hole. Detailed Implementation

[0032] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this application.

[0033] The core of this application is to provide a needle loading and unloading device for a syringe and a syringe, which improves the convenience of needle replacement and increases needle replacement efficiency.

[0034] To enable those skilled in the art to better understand the present application, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0035] Figure 1 This is a structural diagram of a syringe provided in an embodiment of this application. Figure 2 This is a schematic diagram of a needle mounting base provided in an embodiment of this application, as shown below. Figure 1 and Figure 2 As shown, the syringe includes a syringe body 1, a needle mounting seat 2 connected to the syringe body 1, and a needle 3 connected to the needle mounting seat 2 via a conical surface. A connecting block 301 is connected around the bottom edge of the needle 3. Figure 3 This is a cross-sectional view of a needle loading and unloading device provided in an embodiment of this application. Figure 4 This is a schematic diagram of a needle loading and unloading device assembled with a syringe, as provided in an embodiment of this application. Figure 5 This is a schematic diagram of another needle loading and unloading device provided in an embodiment of this application, assembled with a syringe. Figure 6 This is a schematic diagram of a needle clamping block assembled with a syringe, provided as an embodiment of this application. Figure 7 This is a structural diagram of a needle-limiting block provided in an embodiment of this application. Figure 8 This is a cross-sectional view of a needle clamping block provided in an embodiment of this application. Figure 9 This is a side view of a needle clamping block provided in an embodiment of this application. Figure 10 This is a top view of a needle clamping block provided in an embodiment of this application. Figures 3 to 10As shown, the needle loading and unloading device includes: a needle clamping block 5, a needle limiting block 6, and a limiting pin 7; the needle clamping block 5 is provided with a receiving cavity 501, a first assembly hole 502 for the needle mounting seat 2 to pass through, and a second assembly hole 503 for the needle 3 to pass through in sequence along the axial direction; an annular groove 504 is provided between the first assembly hole 502 and the second assembly hole 503; the injection cylinder 1 is coaxially sleeved in the needle clamping block 5 through the receiving cavity 501; the needle clamping block 5 rotates circumferentially around the injection cylinder 1 until it connects with the connecting block 30 in the second assembly hole 503. When misaligned, the annular groove 504 axially limits the connecting block 301, the needle clamping block 5 is coaxially sleeved in the needle limiting block 6 and rotates relative to it, the needle limiting block 6 is connected to the outer wall of the injection cylinder 1, the top of the needle limiting block 6 is provided with a third assembly hole 601 for the needle 3 to pass through, the third assembly hole 601 is used for circumferential limiting of the needle 3, the side wall of the needle limiting block 6 is provided with a through hole 602, the limiting pin 7 is connected to the side wall of the needle clamping block 5 and passes through the through hole 602, the size of the through hole 602 meets the movement range of the limiting pin 7.

[0036] like Figure 2 As shown, the top of the needle mounting base 2 is a conical part, and the needle 3 is fitted onto the needle mounting base 2 through the conical surface of the conical part. Figure 8 As shown, the top surface of the needle clamping block 5 has a second mounting hole 503. Below the second mounting hole 503 are, in sequence, an annular groove 504, a first mounting hole 502, and a receiving cavity 501. The needle 3 enters the second mounting hole 503, causing the connecting block 301 at the bottom of the needle 3 to enter the annular groove 504 through the first mounting hole 502. The injection cylinder 1 is located in the receiving cavity 501 of the needle clamping block 5. The conical part at the top of the needle mounting base 2 enters the second mounting hole 503 through the first mounting hole 502 and is inserted into the bottom of the needle 3. Figure 3As shown, the needle clamping block 5 is located inside the cavity of the needle limiting block 6. The third mounting hole 601 on the top of the needle limiting block 6 communicates with the cavity of the needle limiting block 6. The needle limiting block 6 is connected to the outer wall of the syringe body 1, so that when the needle clamping block 5 rotates inside the cavity of the needle limiting block 6, it will not cause the needle limiting block 6 to rotate circumferentially. The third mounting hole 601 allows the needle 3 to pass through but restricts the circumferential rotation of the needle 3. Specifically, the cross-section of the first mounting hole 502 is a circle that matches the needle mounting base 2, the cross-section of the second mounting hole 503 is a square that matches the edge of the connecting block 301, and the cross-section of the third mounting hole 601 is a square that matches the needle 3. A limiting pin 7 is connected to the side wall of the needle clamping block 5. The limiting pin 7 passes through the through hole 602 in the side wall of the needle limiting block 6. When the operator applies force to drive the limiting pin 7, the limiting pin 7 drives the needle clamping block 5 to rotate in the forward direction and move downward (the needle 3 moves towards the needle mounting base 2). The top wall in the annular groove 504 applies a downward force to the connecting block 301 at the bottom of the needle 3. The downward pressure causes the needle 3 to move down and lock into the conical part at the top of the needle mounting base 2. The limiting pin 7 drives the needle clamping block 5 to rotate in the reverse direction and lift upward (the needle 3 moves away from the needle mounting base 2). The bottom wall in the annular groove 504 applies an upward force to the connecting block 301 at the bottom of the needle 3, causing the needle 3 to move upward and disengage from the conical part at the top of the needle mounting base 2.

[0037] This application provides a syringe needle loading and unloading device. The syringe includes a syringe body 1, a needle mounting seat 2 connected to the syringe body 1, and a needle 3 connected to the needle mounting seat 2 via a conical surface. A connecting block 301 is connected around the bottom edge of the needle 3. The needle loading and unloading device includes a needle clamping block 5, a needle limiting block 6, and a limiting pin 7. The needle clamping block 5 is provided with a receiving cavity 501, a first mounting hole 502 for the needle mounting seat 2 to pass through, and a second mounting hole 503 for the needle 3 to pass through in sequence along the axial direction. An annular groove 504 is formed between the first mounting hole 502 and the second mounting hole 503. The syringe body 1 is coaxially sleeved through the receiving cavity 501. The needle clamping block 5 is installed inside the needle clamping block 5. When the needle clamping block 5 rotates around the syringe body 1 until the second assembly hole 503 is misaligned with the connecting block 301, the annular groove 504 limits the axial movement of the connecting block 301. The needle clamping block 5 is coaxially sleeved inside the needle limiting block 6 and rotates relative to it. The needle limiting block 6 is connected to the outer wall of the syringe body 1. The top of the needle limiting block 6 is provided with a third assembly hole 601 for the needle 3 to pass through. The third assembly hole 601 is used for circumferential limiting of the needle 3. The side wall of the needle limiting block 6 is provided with a through hole 602. The limiting pin 7 is connected to the side wall of the needle clamping block 5 and passes through the through hole 602. The size of the through hole 602 meets the movement range of the limiting pin 7. By setting a needle loading and unloading device on the syringe, the needle clamping block 5 can be driven to move the needle 3 axially by simply driving the limiting pin 7, so that the needle 3 and the needle mounting seat 2 can be easily disassembled or installed, which is more labor-saving, improves the convenience of needle 3 replacement, and improves needle replacement efficiency.

[0038] Based on the above embodiments, Figure 11 This is a structural diagram of another syringe provided in an embodiment of this application. Figure 12 This is a schematic diagram of an injection cylinder provided in an embodiment of this application, as shown below. Figure 8 , Figure 11 and Figure 12 As shown, in this embodiment of the application, the side wall of the needle clamping block 5 is provided with a handle 505. The handle 505 is provided with a first mounting hole 5051 that communicates with the receiving cavity 501. The outer wall of the injection barrel 1 is provided with a first guide groove 101. The first guide groove 101 extends circumferentially along the injection barrel 1 and extends axially along the injection barrel 1. One end of the limiting pin 7 is inserted into the first mounting hole 5051, and the other end of the limiting pin 7 is inserted into the first guide groove 101 and can slide in the first guide groove 101.

[0039] like Figure 11As shown, one end of the limiting pin 7 is inserted into the first mounting hole 5051, and the other end of the limiting pin 7 is inserted into the first guide groove 101. One end of the first guide groove 101 is lower than the other end. When the limiting pin 7 slides from the higher end to the lower end of the first guide groove 101, the needle clamping block 5 rotates circumferentially and moves axially at the same time. The top wall of the annular groove 504 presses down on the connecting block 301 of the needle 3, so that the needle 3 is installed on the needle mounting seat 2. When the limiting pin 7 slides from the lower end to the higher end of the first guide groove 101, the needle clamping block 5 rotates circumferentially and moves axially at the same time. The bottom wall of the annular groove 504 lifts the connecting block 301 of the needle 3, so that the needle 3 is removed from the needle mounting seat 2. In this embodiment of the application, by providing the first guide groove 101 on the outer wall of the injection cylinder 1, the movement trajectory of the limiting pin 7 can be constrained, preventing the limiting pin 7 from rotating excessively, and also making it convenient for the operator to drive the limiting pin.

[0040] Based on the above embodiments, this application embodiment also includes a ball plunger 8, and the handle 505 is also provided with a second mounting hole 5052 communicating with the receiving cavity 501. The outer wall of the injection cylinder 1 is provided with a second guide groove 102. The extension direction of the second guide groove 102 is consistent with the extension direction of the first guide groove 101. Ball head positioning grooves 103 are respectively provided at both ends of the second guide groove 102. One end of the ball plunger 8 is inserted into the second mounting hole 5052, and the ball head at the other end of the ball plunger 8 can slide into or out of the ball head positioning groove 103 along the second guide groove 102.

[0041] like Figure 11 As shown, the ball plunger 8 includes a rod body, a spring, and a ball head. The spring is located within the rod body, and one end of the rod body is inserted into the second mounting hole 5052 of the handle 505. The ball head is connected to the spring within the rod body, so that the ball head is located at the other end of the rod body. The second guide groove 102 is arranged parallel to the lower part of the first guide groove 101, with one end of the second guide groove 102 lower than the other end, and ball head positioning grooves 103 are respectively provided at both ends of the second guide groove 102. When the ball head of the ball plunger 8 slides into the ball head positioning grooves 103 at both ends of the second guide groove 102, it can prevent the needle clamping block 5 from continuing to rotate to a certain extent.

[0042] Based on the above embodiments, the bottom edge of the needle limiting block 6 in this application embodiment is connected to a first connecting seat 603. The first connecting seat 603 is provided with a positioning hole 6031. The side wall of the needle limiting block 6 is provided with a groove 604. The groove 604 extends along the axial direction of the needle limiting block 6, and one end of the groove 604 extends to communicate with the positioning hole 6031. The circumferential surface of the injection cylinder 1 is provided with a second connecting seat 104. The second connecting seat 104 is provided with a threaded hole 1041. The groove 604 is used to engage a screw. One end of the screw is threadedly connected to the threaded hole 1041 through the positioning hole 6031. The screw is used for circumferential limiting of the needle limiting block 6.

[0043] like Figure 7 As shown, the groove 604 on the side wall of the needle limiting block 6 extends along the axial direction of the needle limiting block 6. In this embodiment, the number of grooves 604 is not specifically limited, but the number of grooves 604, the number of positioning holes 6031, and the number of threaded holes 1041 are matched. One end of the screw is engaged in the groove 604, and the other end passes through the positioning hole 6031 and enters the threaded hole 1041, where it is threadedly connected. The screw circumferentially limits the needle limiting block 6, preventing the needle limiting block 6 from moving circumferentially while the needle clamping block 5 moves circumferentially. Because the needle limiting block 6 circumferentially limits the needle 3, the needle 3 moves axially without circumferential rotation, allowing the needle 3 to be smoothly locked onto or detached from the needle mounting base 2.

[0044] Based on the above embodiments, this application embodiment has two handles 505, which are symmetrically arranged on the side wall of the needle clamping block 5. The side wall of the needle limiting block 6 is symmetrically provided with two through holes 602. The size of each through hole 602 meets the movement range of each limiting pin 7. Correspondingly, each handle 505 contains a limiting pin 7 and a ball-head plunger 8. By providing two handles 505, it is convenient for the operator to rotate the needle clamping block 5.

[0045] Based on the above embodiments, in this application embodiment, the first connecting seat 603 is a first annular connecting seat arranged around the bottom edge of the needle limiting block 6, and a plurality of positioning holes 6031 are evenly distributed on the first annular connecting seat. The second connecting seat 104 is a second annular connecting seat arranged around the circumference of the injection cylinder 1, and a plurality of threaded holes 1041 are evenly distributed on the second annular connecting seat, and the positioning holes 6031 and the threaded holes 1041 are arranged in a one-to-one correspondence.

[0046] In this embodiment, the first annular connecting seat of the needle limiting block 6 is provided with a plurality of positioning holes 6031. Correspondingly, the number of grooves 604 on the side wall of the needle limiting block 6 matches the number of positioning holes 6031, and the grooves 604, positioning holes 6031 and threaded holes 1041 are arranged in a one-to-one correspondence. Thus, multiple screws can be used to circumferentially limit the needle limiting block 6, effectively preventing the circumferential rotation of the needle limiting block 6, so that the needle 3 can be smoothly installed and removed from the needle mounting seat 2.

[0047] Based on the above embodiments, the side wall of the needle limiting block 6 in this application embodiment is further provided with a channel hole 605. One end of the channel hole 605 communicates with the through hole 602, and the other end of the channel hole 605 extends to the top surface of the needle limiting block 6 and communicates with the outside. The channel hole 605 on the side wall of the needle limiting block 6 in this application embodiment allows the operator to easily observe the position of the needle clamping block 5 within the needle limiting block 6.

[0048] This application also provides a syringe, such as... Figure 1 ,like Figure 4 and Figure 5 As shown, the syringe includes a syringe body 1, a needle mounting base 2 connected to the syringe body 1, a needle 3 connected to the needle mounting base 2 via a conical surface, and the needle loading and unloading device described in the above embodiment. It also includes a piston rod 4 slidably connected to the syringe body 1. Furthermore, the bottom inner wall of the needle mounting base 2 is provided with internal threads, such as... Figure 12 As shown, the top outer wall of the injection barrel 1 is provided with external threads, and the needle mounting seat 2 and the injection barrel 1 are engaged with each other through internal and external threads.

[0049] The syringe provided in this application includes a needle loading and unloading device. The syringe includes a syringe body 1, a needle mounting seat 2 connected to the syringe body 1, and a needle 3 connected to the needle mounting seat 2 via a conical surface. A connecting block 301 is connected around the bottom edge of the needle 3. The needle loading and unloading device includes a needle clamping block 5, a needle limiting block 6, and a limiting pin 7. The needle clamping block 5 is provided with a receiving cavity 501, a first mounting hole 502 for the needle mounting seat 2 to pass through, and a second mounting hole 503 for the needle 3 to pass through in sequence along the axial direction. An annular groove 504 is formed between the first mounting hole 502 and the second mounting hole 503. The syringe body 1 is coaxial with the receiving cavity 501. The needle clamping block 5 is fitted inside the needle clamping block 5. When the needle clamping block 5 rotates around the syringe body 1 until the second assembly hole 503 is misaligned with the connecting block 301, the annular groove 504 limits the axial movement of the connecting block 301. The needle clamping block 5 is coaxially fitted inside the needle limiting block 6 and rotates relative to it. The needle limiting block 6 is connected to the outer wall of the syringe body 1. The top of the needle limiting block 6 is provided with a third assembly hole 601 for the needle 3 to pass through. The third assembly hole 601 is used for circumferential limiting of the needle 3. The side wall of the needle limiting block 6 is provided with a through hole 602. The limiting pin 7 is connected to the side wall of the needle clamping block 5 and passes through the through hole 602. The size of the through hole 602 meets the movement range of the limiting pin 7. By setting a needle loading and unloading device on the syringe, the needle clamping block 5 can be driven to move the needle 3 axially by simply driving the limiting pin 7, so that the needle 3 and the needle mounting seat 2 can be easily disassembled or installed, which is more labor-saving, improves the convenience of needle 3 replacement, and improves needle replacement efficiency.

[0050] The foregoing has provided a detailed description of a needle loading and unloading device and a syringe provided in this application. The various embodiments in the specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. It should be noted that those skilled in the art can make various improvements and modifications to this application without departing from the principles of this application, and these improvements and modifications also fall within the protection scope of the claims of this application.

[0051] It should also be noted that, in this specification, relational terms such as "first" and "second" are used only 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. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

Claims

1. A needle loading and unloading device for a syringe, the syringe comprising a syringe body (1), a needle mounting seat (2) connected to the syringe body (1), and a needle (3) connected to the needle mounting seat (2) via a conical surface, wherein a connecting block (301) is connected around the bottom edge of the needle (3), characterized in that, include: Needle clamping block (5), needle limiting block (6) and limiting pin (7); The needle clamping block (5) is provided axially with a receiving cavity (501), a first mounting hole (502) for the needle mounting seat (2) to pass through, and a second mounting hole (503) for the needle (3) to pass through. An annular groove (504) is provided between the first mounting hole (502) and the second mounting hole (503). The injection cylinder (1) is coaxially sleeved in the needle clamping block (5) through the receiving cavity (501). When the needle clamping block (5) rotates circumferentially around the injection cylinder (1) until the second mounting hole (503) is misaligned with the connecting block (301), the annular groove (504) is positioned relative to the connecting block. (301) Axial limiting: The needle clamping block (5) is coaxially sleeved in the needle limiting block (6) and rotates relative to it. The needle limiting block (6) is connected to the outer wall of the injection cylinder (1). The top of the needle limiting block (6) is provided with a third assembly hole (601) for the needle (3) to pass through. The third assembly hole (601) is used for circumferential limiting of the needle (3). The side wall of the needle limiting block (6) is provided with a through hole (602). The limiting pin (7) is connected to the side wall of the needle clamping block (5) and passes through the through hole (602). The size of the through hole (602) meets the movement range of the limiting pin (7).

2. The needle loading and unloading device for a syringe according to claim 1, characterized in that, The side wall of the needle clamping block (5) is provided with a handle (505), the handle (505) is provided with a first mounting hole (5051) communicating with the receiving cavity (501), the outer wall of the injection cylinder (1) is provided with a first guide groove (101), the first guide groove (101) extends circumferentially along the injection cylinder (1) and extends axially along the injection cylinder (1), one end of the limiting pin (7) is inserted into the first mounting hole (5051), and the other end of the limiting pin (7) is inserted into the first guide groove (101) and can slide in the first guide groove (101).

3. The syringe needle loading and unloading device according to claim 2, characterized in that, It also includes a ball plunger (8), and the handle (505) is also provided with a second mounting hole (5052) communicating with the receiving cavity (501). The outer wall of the injection cylinder (1) is provided with a second guide groove (102). The extension direction of the second guide groove (102) is consistent with the extension direction of the first guide groove (101). Ball head positioning grooves (103) are respectively provided at both ends of the second guide groove (102). One end of the ball plunger (8) is inserted into the second mounting hole (5052), and the ball head of the other end of the ball plunger (8) can slide into or out of the ball head positioning groove (103) along the second guide groove (102).

4. The needle loading and unloading device for a syringe according to claim 1, characterized in that, The first mounting hole (502) has a circular cross-section that matches the needle mounting base (2), the second mounting hole (503) has a square cross-section that matches the edge of the connecting block (301), and the third mounting hole (601) has a square cross-section that matches the needle (3).

5. The needle loading and unloading device for a syringe according to claim 1, characterized in that, The bottom edge of the needle limiting block (6) is connected to a first connecting seat (603), the first connecting seat (603) is provided with a positioning hole (6031), the side wall of the needle limiting block (6) is provided with a groove (604), the groove (604) extends along the axial direction of the needle limiting block (6), and one end of the groove (604) extends to communicate with the positioning hole (6031). The circumferential surface of the injection cylinder (1) is provided with a second connecting seat (104), the second connecting seat (104) is provided with a threaded hole (1041), the groove (604) is used to engage a screw, one end of the screw is threadedly connected to the threaded hole (1041) through the positioning hole (6031), and the screw is used for circumferential limiting of the needle limiting block (6).

6. The needle loading and unloading device for a syringe according to claim 3, characterized in that, There are two handles (505), and the two handles (505) are symmetrically arranged on the side wall of the needle clamping block (5). The side wall of the needle limiting block (6) is symmetrically provided with two through holes (602).

7. The syringe needle loading and unloading device according to claim 5, characterized in that, The first connecting seat (603) is a first annular connecting seat arranged around the bottom edge of the needle limiting block (6), and a plurality of positioning holes (6031) are evenly distributed on the first annular connecting seat. The second connecting seat (104) is a second annular connecting seat arranged around the circumference of the injection cylinder (1), and a plurality of threaded holes (1041) are evenly distributed on the second annular connecting seat, and the positioning holes (6031) and the threaded holes (1041) are arranged in a one-to-one correspondence.

8. The needle loading and unloading device for a syringe according to claim 2, characterized in that, The side wall of the needle limiting block (6) is also provided with a channel hole (605). One end of the channel hole (605) is connected to the through hole (602), and the other end of the channel hole (605) extends to the top surface of the needle limiting block (6) and is connected to the outside.

9. A syringe, characterized in that, The device includes an injection barrel (1), a needle mounting base (2) connected to the injection barrel (1), a needle (3) connected to the needle mounting base (2) via a conical surface, and a needle loading and unloading device according to any one of claims 1 to 8.

10. The syringe according to claim 9, characterized in that, The needle mounting base (2) has an internal thread on its bottom inner wall and an external thread on its top outer wall. The needle mounting base (2) and the injection cylinder (1) are engaged by the internal thread and the external thread.

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