Fixed injection device

Abstract

The invention discloses a fixed injection device, and relates to the technical field of medical instruments. The fixed injection device comprises a needle tube, a connecting piece and a pushing piece, a sheath is arranged on the periphery of the needle tube, the opening end of the sheath is connected with the connecting piece in a matched mode, and the pushing piece is connected to the needle tube and extends to the outside of the sheath from the joint of the sheath and the connecting piece in the axial direction of the sheath, so that one part of the pushing piece is arranged in the sheath, and the other part of the pushing piece is arranged in the sheath. And the other part is arranged outside the sheath. Besides, the pushing piece can move relative to the needle tube under the action of external force and drives the sheath to be separated from the connecting piece in the moving process, and when operating the fixed injection device, a medical worker can hold the fixed injection device with one hand and apply external force to the pushing piece located outside the sheath with fingers, so that the fixed injection device can be fixed. Therefore, the whole sheath can be detached relative to the connecting piece, and the operation is simple and convenient.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a fixed injection device. Background Art

[0002] Existing fixed injection devices generally include a needle tube assembly, an injection piece, and a connector that connects and fixes the two. Among them, the needle tube assembly generally includes a needle tube and a sheath. The sheath is generally arranged on the outer periphery of the needle tube to protect the needle tube. During operation, medical staff need to first remove the sheath relative to the needle tube, then insert the needle tube into the collection vessel, absorb the liquid in the collection vessel into the injection piece, or transfer the liquid in the injection piece to the collection vessel; or, puncture the patient's vein with the needle tube, absorb the patient's blood into the injection piece, or transfer the liquid in the injection piece into the patient's body.

[0003] However, medical staff generally need to perform other operations when operating the fixed injection device. For example, when drawing blood or delivering liquid to the patient, they need to press, pat, etc. on the patient. If the sheath around the needle tube is removed in advance, the needle tube may be contaminated or the needle tube may accidentally injure others. However, if the sheath around the needle tube is not removed in advance, the medical staff will press, pat, etc. on the patient with one hand when drawing blood or delivering liquid to the patient, and it is difficult to remove the sheath around the needle tube with only the other hand. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a fixed injection device in order to overcome the defect in the prior art that it is difficult for medical personnel to remove the sheath around the needle tube with one hand during actual operation.

[0005] The present invention solves the above technical problems through the following technical solutions:

[0006] A fixed injection device, comprising a needle tube and a connecting piece, a sheath is arranged on the periphery of the needle tube, and an open end of the sheath is cooperatively connected with the connecting piece, wherein the fixed injection device further comprises:

[0007] A pushing member, the pushing member is connected to the needle tube and extends from a connection point between the sheath and the connecting member to the outside of the sheath along the axial direction of the sheath;

[0008] The pushing member is movable relative to the needle tube under the action of an external force, and drives the sheath to be separated from the connecting member during the movement.

[0009] In this solution, a pusher is provided to be connected to the needle tube, and in the axial direction of the sheath, the pusher extends from the connection between the sheath and the connector to the outside of the sheath, so that when the open end of the sheath is connected with the connector, a part of the pusher is arranged inside the sheath, and the other part is arranged outside the sheath. At this time, the pusher located outside the sheath can bear external force, so that the entire pusher moves relative to the needle tube, and drives the sheath to be separated from the connector during the movement. When the medical staff operates the fixed injection device, the medical staff can hold the fixed injection device with one hand, and use the fingers to apply external force to the pusher located outside the sheath, so that the entire sheath can be disassembled relative to the connector, and the operation is simple and convenient.

[0010] Furthermore, the outer wall of the sheath corresponding to the position of the pushing member protrudes outward to form an accommodating cavity, and the pushing member abuts against the bottom of the accommodating cavity during the movement.

[0011] In the present solution, through this arrangement, at the position where the pushing member is set, an accommodating cavity is formed between the outer wall of the sleeve and the connecting member, and the pushing member can be accommodated in the accommodating cavity. The pushing member abuts against the bottom of the accommodating cavity during movement, making it easier to push the sleeve off the connecting member.

[0012] Furthermore, the pushing member includes a first section and a second section arranged at an angle, the head end of the first section is connected to the needle tube and extends along the axial direction of the sheath from the connection between the sheath and the connecting member to the outside of the sheath, and the end of the first section is connected to the head end of the second section.

[0013] In the present solution, by setting the second section of the pushing member at an angle to the first section outside the sleeve, when an external force is applied to the end of the second section, the pushing member as a whole undergoes a certain deformation, so that the first section of the pushing member can be close to the sleeve and abut against the sleeve, thereby enabling the movement of the pushing member to make it easier for the sleeve to detach from the connecting member.

[0014] Further, along the radial direction of the connecting member, the end of the second section extends outward relative to the head end of the second section.

[0015] In the present solution, through this arrangement, the end of the second section is arranged away from the connecting member in the radial direction of the connecting member, thereby avoiding interference between the pushing member and other components. At the same time, when medical staff hold the fixed injection device, it is also more convenient to apply external force to the end of the second section, which is more conducive to the removal of the sheath.

[0016] Furthermore, the pushing member also includes a pressing portion, which is arranged at the end of the second section, and has a pressing surface that bears external force.

[0017] In this solution, through this arrangement, a pressing portion is provided at the end of the second section of the pusher, and the pressing surface of the pressing portion is used to bear the external force, making the operation more comfortable and convenient for medical staff.

[0018] Furthermore, the pushing member also includes a fixing ring, which is slidably connected to the periphery of the needle tube, and the head end of the first section is connected to the fixing ring.

[0019] In the present solution, through this arrangement, the pusher can be better fixed to the periphery of the needle tube and will not be easily detached during the process of being relative to the needle tube.

[0020] Furthermore, the fixed injection device also includes a needle seat, the needle tube is sealingly inserted into the interior of the needle seat, the needle seat is sealingly inserted into the connecting piece along the axial direction of the connecting piece, and the fixing ring is slidably connected to the periphery of the needle seat.

[0021] In the present solution, the needle tube is sealably inserted into the interior of the needle seat, the needle seat is connected to the needle tube and then sealably inserted into the connecting piece, thereby preventing the radial dimension of the needle tube from being too small, resulting in insufficient connection strength between the needle tube and the connecting piece or failure to seal the connection; at the same time, the fixing ring slides relative to the needle tube through the needle seat, thereby preventing the radial dimension of the needle tube from being too small, resulting in insufficient strength of the needle tube and bending.

[0022] Furthermore, the fixed injection device also includes a plurality of slides, which are cylindrical with openings at both ends and are nested with each other, the innermost slide is nested in the periphery of the needle seat, and the pusher is connected to the outermost slide; wherein the innermost slide can slide relative to the needle seat and between adjacent slides along the axial direction of the needle tube.

[0023] In this solution, by nesting multiple sliding parts on the periphery of the needle seat, the fixed ring is indirectly connected to the needle seat through the multiple sliding parts. Through the mutual sliding between the multiple sliding parts, it is more convenient for the pushing member to move relative to the needle seat along the axial direction of the needle tube, thereby driving the sheath to detach from the connecting member.

[0024] Furthermore, one end of the connector for inserting the needle holder extends outwardly in the radial direction of the connector to form an annular wall, and the open end of the sheath is cooperatively connected to the periphery of the annular wall;

[0025] An annular cavity is formed between the annular wall and the connecting member. When the plurality of sliding members are not sliding against each other, one end of the plurality of sliding members close to the connecting member is accommodated in the annular cavity.

[0026] In the present solution, through this arrangement, when the sheath is removed relative to the needle tube, due to the existence of the annular wall, the distance between the sheath and the needle tube is enlarged, thereby avoiding mutual contact during the removal process; at the same time, when the medical staff needs to remove the sheath, they only need to apply a small force to the pusher to make the outermost slide slide. At this time, the end of the other slides close to the connecting member can still be accommodated in the annular accommodating cavity, and the end of the outermost slide away from the connecting member will not exceed the first end of the needle seat too much, thereby avoiding the position of the slide from interfering with the needle tube when the needle tube is inserted into the collection container or punctures the patient's human vein.

[0027] Furthermore, the needle seat and the non-outermost sliding member are provided with a limiting slot at one end away from the connecting member, and each sliding member is provided with a buckle at one end close to the connecting member, and the buckle can be combined with the limiting slot to limit the innermost sliding member from sliding away from the needle seat, and the sliding of multiple sliding members from each other.

[0028] In this solution, by correspondingly arranging limit slots and buckles on the needle seat and each sliding member, it is prevented that the multiple sliding members are separated when sliding against each other.

[0029] Furthermore, the total length of the plurality of slides in the sliding direction is greater than the axial dimension of the needle tube.

[0030] In this solution, through this arrangement, when the medical staff operates the fixed injection device to complete liquid collection or delivery, they can further push multiple slides so that the multiple slides completely wrap the needle tube, thereby preventing the needle tube from accidentally injuring the medical staff after the operation is completed.

[0031] Furthermore, the fixed injection device also includes an injection piece, which is connected to an end of the connecting piece away from the needle tube, and is used to drive the flow of liquid and contain liquid.

[0032] In the present solution, through this arrangement, the injection piece is used to realize the collection and transportation of liquid. At the same time, the injection piece can also drive the flow of liquid, making it easier to promote the outflow of liquid during the liquid collection process.

[0033] Furthermore, the injection component is a syringe, and the nipple of the syringe is sealingly connected to an end of the connector away from the needle tube.

[0034] In this solution, a syringe is directly used as an injection piece, and the nipple of the syringe is sealed and connected to the connector, making the liquid delivery safer. At the same time, the pulling of the syringe can more conveniently provide a driving force for the flow of the liquid, making the liquid collection and delivery process more convenient.

[0035] The positive and progressive effects of the present invention are:

[0036] The fixed injection device is connected to the needle tube by setting a pusher, and in the axial direction of the sheath, the pusher extends from the connection between the sheath and the connecting piece to the outside of the sheath, so that when the open end of the sheath is connected with the connecting piece, a part of the pusher is arranged inside the sheath, and the other part is arranged outside the sheath. At this time, the pusher located outside the sheath can bear external force, so that the entire pusher moves relative to the needle tube, and drives the sheath to be separated from the connecting piece during the movement. When the medical staff operates the fixed injection device, the medical staff can hold the fixed injection device with one hand, and use the fingers to apply external force to the pusher located outside the sheath, so that the entire sheath can be disassembled relative to the connecting piece. The operation is simple and convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 Schematic diagram of the overall structure of a fixed injection device in one embodiment of the present invention.

[0038] Figure 2 It is a schematic diagram of the overall structure of a fixed injection device in one embodiment of the present invention, wherein the injection part is hidden.

[0039] Figure 3 It is a schematic diagram of the overall cross-sectional structure of a fixed injection device in one embodiment of the present invention.

[0040] Figure 4 It is a schematic diagram of the overall structure of a fixed injection device in one embodiment of the present invention; wherein the injection piece and the sheath are hidden.

[0041] Figure 5 It is a schematic diagram of the connection and assembly of a needle tube, a needle seat and a connecting piece in one embodiment of the present invention.

[0042] Figure 6 Schematic diagram of the structure of a pusher in one embodiment of the present invention.

[0043] Figure 7 Schematic diagram of the structure of a connecting member in one embodiment of the present invention.

[0044] Figure 8 Schematic diagram of the structure of the inner sliding member in one embodiment of the present invention.

[0045] Fig. 9 Schematic diagram of the structure of a middle layer sliding member in one embodiment of the present invention.

[0046] Fig.10 Schematic diagram of the structure of the outer sliding member in one embodiment of the present invention.

[0047] Description of reference numerals:

[0048] Needle 10

[0049] Sheath 11

[0050] Syringe 20

[0051] Nipple 21

[0052] Connector 30

[0053] Annular wall 31

[0054] Annular cavity 311

[0055] Needle holder 50

[0056] Pusher 60

[0057] Pressing portion 61

[0058] 62

[0059] 63

[0060] Fixed ring 64

[0061] Outer sliding member 71

[0062] Middle layer slide 72

[0063] Inner slide 73

[0064] Buckle 74

[0065] Limit slot 75 DETAILED DESCRIPTION

[0066] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, but are not to be construed as limiting the present invention. All other embodiments obtained by ordinary technicians in the field without creative work based on the embodiments of the present invention are within the scope of protection of the present invention.

[0067] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “circumferential”, “radial”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0068] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0069] like Figure 1 , Figure 2 and Figure 3 As shown, this embodiment provides a fixed injection device, which includes a needle tube assembly, an injection piece, and a connector 30 that connects and fixes the two. The needle tube assembly specifically includes a needle tube 10 and a sheath 11. The needle tube 10 is mainly used to pierce the patient's human vein. The sheath 11 is sleeved on the periphery of the needle tube 10. The sheath 11 is a structure with one end open and the other end closed, wherein the open end of the sheath 11 is sleeved on the periphery of the connector 30 and is connected with the connector 30. The main function of the sheath 11 is to protect the needle tube 10. The injection piece is mainly used to drive the flow of blood and collect blood. In this embodiment, the injection piece specifically adopts a syringe 20, and the nipple 21 of the syringe 20 is threadedly connected to the connector 30.

[0070] During the blood collection process, the medical staff needs to first remove the sheath 11 from the connector 30 to separate it from the needle tube 10, and then puncture the patient's vein with the needle tube 10. The blood will pass through the needle tube 10 to the connector 30 in sequence, and finally be collected in the syringe 20. Similarly, when the medical staff injects liquid into the patient, they also need to first remove the sheath 11 from the connector 30 to separate it from the needle tube 10, and then puncture the patient's vein with the needle tube 10. The liquid will pass through the connector 30 to the needle tube 10 in sequence, and finally be injected into the patient's vein.

[0071] It should be noted that the fixed injection device in this embodiment is mainly used to collect blood from patients and inject liquid into the patient's human veins. However, in other embodiments, the fixed injection device can also be used in other occasions where liquid needs to be drawn or injected. For example, in the field of medicine, two liquids need to be mixed to achieve the purpose of dispensing. In this case, the fixed injection device can be used to draw a certain dose of one liquid and then inject it into the other liquid. For specific operation conditions, please refer to the blood collection and liquid injection in this embodiment.

[0072] In this embodiment, Figure 2 and Figure 3As shown, the fixed injection device also includes a pusher 60, one end of which is connected to the needle tube 10, and along the axial direction of the sheath 11, the other end of the pusher 60 extends from the connection between the sheath 11 and the connecting member 30 to the outside of the sheath 11, so that when the open end of the sheath 11 is connected with the connecting member 30, a part of the pusher 60 is arranged inside the sheath 11, and the other part is arranged outside the sheath 11. In addition, the pusher 60 located outside the sheath 11 can bear external force, so that the entire pusher 60 moves relative to the needle tube 10, and drives the sheath 11 to be separated from the connecting member 30 during the movement. When the medical staff is collecting blood or injecting liquid, the medical staff can hold the fixed injection device with one hand, and use the fingers to apply external force to the pusher 60 located outside the sheath 11, so that the entire sheath 11 can be disassembled relative to the connecting member 30, and the operation is simple and convenient.

[0073] In this embodiment, Figure 2 and Figure 3 As shown, the structure of the sheath 11 is adapted to the structure of the connector 30, and the overall structure of the sheath 11 is a truncated cone-shaped sleeve structure, and the open end of the sheath 11 is sleeved on the periphery of the connector 30 and is connected with the connector 30. However, the outer wall of the sheath 11 corresponding to the position of the pusher 60 protrudes outward to form a receiving cavity, that is, the open end of the sheath 11 and the periphery of the connector 30 cooperate to form a receiving cavity at the position of the pusher 60, and the pusher 60 is arranged in the receiving cavity, one end of the pusher 60 is connected to the needle tube 10 in the receiving cavity, and the other end of the pusher 60 extends from the receiving cavity to the outside of the sheath 11. When the pusher 60 moves under the action of an external force, the pusher 60 can abut against the bottom of the receiving cavity to drive the sheath 11 to move, so that the sheath 11 is more easily pushed off the connector 30.

[0074] Furthermore, combined with Figure 4 and Figure 6 As shown, the pusher 60 specifically includes a first section 62 and a second section 63 arranged at an angle, the head end of the first section 62 is connected to the needle tube 10 in the accommodating cavity, and the first section 62 extends from the connection between the sheath 11 and the connecting member 30 to the outside of the sheath 11 along the axial direction of the sheath 11, and the end of the first section 62 is connected to the head end of the second section 63 outside the sheath 11. By arranging the second section 63 of the pusher 60 at an angle to the first section 62 outside the sheath 11, when an external force is applied to the end of the second section 63, the pusher 60 as a whole is deformed to a certain extent, so that the first section 62 of the pusher 60 can be close to the sheath 11 and abut against the sheath 11, so that the movement of the pusher 60 can drive the sheath 11 to be more easily separated from the connecting member 30.

[0075] Specifically, in this embodiment, the end of the second section 63 extends outward relative to the head end of the second section 63 along the radial direction of the connecting member 30, that is, the direction in which the end of the second section 63 extends is away from the connecting member 30. Through this arrangement, the end of the second section 63 is arranged away from the connecting member 30 in the radial direction of the connecting member 30, avoiding interference between the pusher 60 and other components. At the same time, when the medical staff holds the fixed injection device, it is also more convenient to apply external force to the end of the second section 63, which is more conducive to the removal of the sheath 11. Of course, in other embodiments, if the radial size of the connecting member 30 becomes larger, the size of the open end of the sheath 11 will also become larger. At this time, the end of the second section 63 can also extend inward relative to the head end of the second section 63 along the radial direction of the connecting member 30, that is, the direction in which the end of the second section 63 extends is close to the connecting member 30, as long as the pusher 60 does not interfere with other components.

[0076] In addition, if Figure 3 , Figure 4 and Figure 6 As shown, the pusher 60 also includes a pressing portion 61, which is arranged at the end of the second section 63, and the pressing portion 61 also has a pressing surface for bearing external force, and the pressing surface is specifically an arc surface, so that when the medical staff holds the fixed injection device, the surface of the thumb can abut against the pressing surface. Through this arrangement, the pressing portion 61 is arranged at the end of the second section 63 of the pusher 60, and the pressing surface of the pressing portion 61 is used to bear external force, so that the medical staff can operate more comfortably and conveniently.

[0077] like Figure 3 , Figure 4 and Figure 6 As shown, the pusher 60 also includes a fixing ring 64, which is slidably arranged on the periphery of the needle tube 10 and can slide back and forth relative to the needle tube 10. The first end of the first section 62 of the pusher 60 is connected to the fixing ring 64. Through this arrangement, the pusher 60 can be better fixed on the periphery of the needle tube 10 and will not be easily separated during the process relative to the needle tube 10. Specifically, in combination with Figure 5 As shown, the fixed injection device further includes a needle seat 50, the needle tube 10 is sealedly inserted into the needle seat 50, the needle seat 50 is sealedly inserted into the connecting member 30 along the axial direction of the connecting member 30, and the fixing ring 64 of the pushing member 60 is specifically arranged on the periphery of the needle seat 50. By sealingly inserting the needle tube 10 into the needle seat 50, the needle seat 50 is connected to the needle tube 10 and then sealedly inserted into the connecting member 30 together, so as to avoid the radial dimension of the needle tube 10 being too small, resulting in insufficient connection strength between the needle tube 10 and the connecting member 30 or failure of sealing connection; at the same time, the fixing ring 64 slides relative to the needle tube 10 through the needle seat 50, so as to avoid the radial dimension of the needle tube 10 being too small, resulting in insufficient strength of the needle tube 10 and bending of the needle tube 10.

[0078] Further, such as Figure 3 , Figure 8 , Fig. 9 and Fig.10 As shown, the fixed injection device further includes three slides, namely, an outer slide 71, a middle slide 72 and an inner slide 73. Each slide is a tubular structure with openings at both ends and is nested with each other. The inner slide 73 is nested in the periphery of the needle seat 50, and the pusher 60 is fixedly connected to the outer slide 71. The inner slide 73 can slide relative to the needle seat 50 and between adjacent slides along the axial direction of the needle tube 10. By nesting these slides at the periphery of the needle seat 50, the fixing ring 64 is indirectly connected to the needle seat 50 through these slides. By sliding between these slides, it is more convenient for the pusher 60 to move relative to the needle seat 50 along the axial direction of the needle tube 10, thereby driving the sheath 11 to be separated from the connecting member 30. It should be noted that, in the present embodiment, the number of slides is set to three, and the three slides are nested with each other, but in other embodiments, the slides can be set to other numbers. The preferred setting is that the number of slides is set corresponding to the length of the needle tube 10. When the length of each slide and the needle tube 10 is certain, by adjusting the number of slides, the medical staff can push the nested slides to make each slide slide with each other after blood collection or liquid injection, thereby completely wrapping the needle tube 10 to prevent the used needle tube 10 from accidentally injuring the medical staff or other personnel.

[0079] Further, such as Figure 3 , Figure 5 and Figure 7As shown, the connector 30 has an annular wall 31 extending outwardly along the radial direction of the connector 30 at one end for the needle seat 50 to be inserted, and the open end of the sheath 11 is directly connected to the periphery of the annular wall 31, and an annular cavity 311 is formed between the annular wall 31 and the connector 30. In this embodiment, the annular wall 31 is directly integrally formed with the connector 30, but in other embodiments, the annular wall 31 and the connector 30 can be completely separated. With this arrangement, when the sheath 11 is disassembled relative to the needle tube 10, due to the presence of the annular wall 31, the distance between the sheath 11 and the needle tube 10 is enlarged to avoid mutual contact during the disassembly process. In addition, the three slides are nested with each other when they are not sliding against each other, that is, the ends of the three slides in the nested state close to the connecting member 30 are all accommodated inside the annular cavity 311. With this arrangement, when medical staff need to remove the sheath 11, they only need to apply a small force to the pusher 60 to make the outer slide 71 slide. At this time, the ends of the other slides close to the connecting member 30 can still be accommodated inside the annular accommodating cavity, and the end of the outer slide 71 away from the connecting member 30 will not exceed the first end of the needle seat 50 too much, thereby avoiding the position of the slide interfering with the needle tube 10 when it punctures the patient's human vein.

[0080] like Figure 5 , Figure 8 , Fig. 9 and Fig.10 As shown, a limiting slot 75 is provided at the needle seat 50 and the end of the non-outermost sliding member away from the connecting member 30, and a buckle 74 is provided at the end of each sliding member close to the connecting member 30. The buckle 74 can be combined with the limiting slot 75 to limit the inner sliding member 73 from sliding off the needle seat 50, and to limit the sliding off between the multiple sliding members. When the buckles 74 on the three sliding members and the corresponding limiting slots 75 are combined with each other, the length of the three sliding members in the axial direction of the needle tube 10 is the longest. At this time, the total length of the three sliding members in this direction is greater than the axial dimension of the needle tube 10, so that the multiple sliding members completely wrap the needle tube 10 to prevent the needle tube 10 from accidentally injuring the medical staff after the operation is completed.

[0081] like Figure 1 and Figure 3 As shown, the injection piece in this embodiment specifically adopts a syringe 20, and the specific structure of the syringe 20 is prior art and will not be described here. The nipple 21 of the syringe 20 is sealed and connected to the end of the connector 30 away from the needle tube 10. During the process of blood collection or liquid injection by medical staff, by pulling the piston of the syringe 20, a driving force can be provided for the flow of blood, and the drawn blood can be accommodated, making the entire blood collection process smoother and reducing the pain of the user. Of course, in other embodiments, the injection piece can also have other structures existing in the prior art, as long as it can provide a driving force for the flow of liquid and can accommodate liquid.

[0082] Although the specific embodiments of the present invention are described above, it should be understood by those skilled in the art that this is only for illustration and the protection scope of the present invention is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but these changes and modifications all fall within the protection scope of the present invention.

Claims

1. A fixed injection device, comprising a needle tube and a connecting piece, wherein a sheath is disposed on the periphery of the needle tube, and an open end of the sheath is cooperatively connected with the connecting piece, characterized in that: The fixed injection device also includes: A pushing member, the pushing member is connected to the needle tube and extends from a connection point between the sheath and the connecting member to the outside of the sheath along the axial direction of the sheath; The pushing member is movable relative to the needle tube under the action of an external force, and drives the sheath to be separated from the connecting member during the movement.

2. The fixed injection device according to claim 1, characterized in that: The outer wall of the sheath corresponding to the position of the pushing member protrudes outward to form an accommodating cavity, and the pushing member abuts against the bottom of the accommodating cavity during the movement.

3. The fixed injection device according to claim 1, characterized in that: The pusher includes a first section and a second section arranged at an angle, wherein the head end of the first section is connected to the needle tube and extends from the connection between the sheath and the connector to the outside of the sheath along the axial direction of the sheath, and the end of the first section is connected to the head end of the second section.

4. The fixed injection device according to claim 3, characterized in that: Along the radial direction of the connecting member, the end of the second section extends outward relative to the head end of the second section.

5. The fixed injection device according to claim 3, characterized in that: The pushing member further includes a pressing portion, which is disposed at the end of the second section and has a pressing surface for bearing external force.

6. The fixed injection device according to claim 3, characterized in that: The pushing member also includes a fixing ring, which is slidably connected to the periphery of the needle tube, and the head end of the first section is connected to the fixing ring.

7. The fixed injection device according to claim 6, characterized in that: The fixed injection device also includes a needle seat, the needle tube is sealed and inserted into the interior of the needle seat, the needle seat is sealed and inserted into the connecting piece along the axial direction of the connecting piece, and the fixing ring is slidably connected to the periphery of the needle seat.

8. The fixed injection device according to claim 7, characterized in that: The fixed injection device also includes a plurality of slides, which are cylindrical with openings at both ends and are nested with each other, the innermost slide is nested on the periphery of the needle seat, and the pusher is connected to the outermost slide; wherein the innermost slide can slide relative to the needle seat and between adjacent slides along the axial direction of the needle tube.

9. The fixed injection device according to claim 8, characterized in that: One end of the connector for inserting the needle holder extends outwardly in the radial direction of the connector to form an annular wall, and the open end of the sheath is cooperatively connected to the periphery of the annular wall; An annular cavity is formed between the annular wall and the connecting member. When the plurality of sliding members are not sliding against each other, one end of the plurality of sliding members close to the connecting member is accommodated in the annular cavity.

10. The fixed injection device according to claim 8, characterized in that: The needle seat and the non-outermost sliding member are provided with a limiting slot at one end away from the connecting member, and each sliding member is provided with a buckle at one end close to the connecting member, and the buckle can be combined with the limiting slot to limit the sliding member of the innermost layer from sliding away from the needle seat, and the sliding members from sliding away from each other.

11. The fixed injection device according to claim 10, characterized in that: The total length of the plurality of slide members in the sliding direction is greater than the axial dimension of the needle tube.

12. The fixed injection device according to any one of claims 1 to 11, characterized in that: The fixed injection device also includes an injection piece, which is connected to an end of the connecting piece away from the needle tube, and is used to drive the flow of liquid and contain liquid.

13. The fixed injection device according to claim 12, characterized in that: The injection piece is a syringe, and the nipple of the syringe is sealed and connected to an end of the connector away from the needle tube.

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