A needle-puncture-proof fluid delivery device

Abstract

The present invention relates to the technical field of medical devices, and provides an anti-needle puncture fluid delivery device, comprising: a catheter seat structure; a needle tube structure, comprising a needle tube, the needle tip of the needle tube can pass through the catheter seat structure; a protective structure, which is sleeved on the needle tube and includes a protective sheet, the protective sheet includes a protective sheet body, and a baffle extending from one end of the protective sheet body, and an opening is formed between the baffle and the protective sheet body; the protective sheet has a first state of pressing against the needle tube, and a second state of shielding the needle tip; when the protective sheet is in the first state, the opening is facing away from the needle tube. In the anti-needle puncture fluid delivery device, an opening is formed between the baffle and the protective sheet body, and when the protective sheet is in the first state, the opening is arranged to face away from the needle tube, which can avoid the original sharp contact between the needle tube and the baffle, thereby alleviating the stress concentration phenomenon and preventing the needle tube from deforming; moreover, there is no need to bend the baffle, which reduces the process flow, reduces the processing difficulty, and is conducive to reducing production costs.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to an acupuncture-proof fluid delivery device. Background Art

[0002] At present, indwelling needles that cause less damage to blood vessels have been widely used in clinical practice. However, during the infusion operation, after the puncture, the steel needle needs to be pulled out of the hose and properly disposed of. This process may stab medical staff, causing injuries to medical staff or even cross-infection, endangering their health and safety.

[0003] The existing needle-stick-proof indwelling needle mainly includes a catheter seat, a needle seat, a needle tube, a protective seat and a protective sheet, wherein the needle seat can be slidably mounted on the outside of the catheter seat; the needle tube is installed on the needle seat and the needle tip can pass through the catheter seat; the protective seat can be slidably arranged in the needle seat, and has a protective seat body for the needle tube to pass through, and a receiving cavity for receiving part of the needle tube is formed in the protective seat body; the protective sheet is installed on the protective seat, and has a protective sheet body, and one end of the protective sheet body is formed with a baffle plate received in the receiving cavity; the protective sheet is snap-connected or fixed to the protective seat body; the baffle plate has a first state of pressing against the needle tube, and a second state of shielding the needle tip. Moreover, in this scheme, a baffle plate is arranged at one end of the protective sheet close to the needle tip, and after the needle is pulled out, the needle tip will press against the baffle plate to prevent the needle tip from leaking out and injuring medical staff. However, when the needle is not removed, the side wall of the needle tube and the edge of the baffle are in contact with each other, and the two are in line contact, which will cause stress concentration between the needle tube and the baffle, causing the needle tube to deform easily and even affecting normal puncture use. If the edge of the baffle contacting the needle tube is bent, although the contact area between the baffle and the needle tube can be increased and the stress concentration phenomenon can be alleviated, the protective sheet itself is small in size and requires high process precision. Bending the baffle will not only increase the process flow and increase the difficulty of processing, but also increase the production cost. Summary of the invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defect in the prior art that the baffle on the protective sheet in the anti-needlestick indwelling needle easily causes stress concentration between the needle tube and the baffle, thereby making the needle tube easily deformed and even affecting normal puncture use, thereby providing an anti-needlestick fluid delivery device.

[0005] In order to solve the above technical problems, the technical solution of the present invention is as follows:

[0006] A needle-puncture-proof fluid delivery device comprises: a catheter seat structure; a needle tube structure, comprising a needle tube, the needle tip of the needle tube can pass through the catheter seat structure; a protection structure, which is sleeved on the needle tube and comprises a protection sheet, the protection sheet comprises a protection sheet body, and a blocking sheet extending from one end of the protection sheet body, an opening is formed between the blocking sheet and the protection sheet body; the protection sheet has a first state of pressing against the needle tube, and a second state of shielding the needle tip; when the protection sheet is in the first state, the opening faces away from the needle tube.

[0007] Furthermore, when the protection sheet is in the first state, the connection between the blocking sheet and the protection sheet body abuts against the needle tube.

[0008] Furthermore, a clearance space is provided on the protective sheet body, and the protective sheet body and the baffle sheet form a protective space; the needle tube passes through the clearance space to switch the protective sheet from the first state to the second state; and when the protective sheet is in the second state, the needle tip is located in the protective space.

[0009] Furthermore, the clearance space is a clearance through hole.

[0010] Furthermore, the giving way through hole is a strip-shaped through hole, and the length direction of the strip-shaped through hole is consistent with the length direction of the protection sheet body.

[0011] Furthermore, the catheter seat structure includes an installation cavity, and a notch provided on the outer peripheral wall of the catheter seat structure and connected to the installation cavity; when the protective sheet is in a first state, the baffle extends into the notch; when the protective sheet is in a second state, the baffle retracts from the notch into the installation cavity.

[0012] Furthermore, the protection structure also includes a protection seat, which includes a protection seat body through which the needle tube can pass, and a receiving cavity formed in the protection seat body and receiving part of the needle tube; the protection sheet is installed on the protection seat body and received in the receiving cavity.

[0013] Furthermore, at least one card body is provided at one end of the protection sheet body away from the blocking sheet, and the card body is snapped into the accommodating cavity and is suitable for fixing the protection sheet on the protection seat.

[0014] Furthermore, there are two card bodies, and the two card bodies are arranged oppositely on two sides of the protection sheet body.

[0015] Furthermore, the card body includes a card, a limiting piece is provided on the card, a limiting block is provided at a corresponding position of the inner side wall of the accommodating cavity, and when the card is inserted into the accommodating cavity, the limiting piece abuts against the limiting block.

[0016] Furthermore, the card body is a limiting ring arranged along the circumferential direction of the protective sheet body, and the bottom of the accommodating cavity is provided with a limiting body extending along the length direction of the needle tube. When the protective sheet is located in the accommodating cavity, the inner side wall of the limiting ring is against the limiting body.

[0017] Furthermore, when the protective sheet is in the first state, the angle formed between the protective sheet body and the needle tube is in the range of 8°-12°; when the protective sheet is in the second state, the angle formed between the protective sheet body and the needle tube is in the range of 22°-26°.

[0018] Furthermore, the end surface of the protective seat close to the needle tip is provided with a distal hole, and the end surface of the protective seat away from the needle tip is provided with a proximal hole; the outer wall of the needle tube is provided with a flange, and the cross-section of the flange is smaller than the aperture size of the proximal hole.

[0019] Furthermore, the distance between the flange and the needle tip is smaller than the distance between the blocking piece and the proximal hole on the protection seat.

[0020] Furthermore, a guide block is provided in the accommodating cavity, a middle hole is provided on the guide block, and an extension direction of the middle hole is consistent with an extension direction of the needle tube.

[0021] Further, when the protection sheet is in the first state, the protection seat is at least partially located in the catheter seat structure.

[0022] Furthermore, the protective sheet has a Z-shaped structure as a whole.

[0023] Furthermore, the needle tube structure also includes a needle seat, and one end of the needle tube away from the needle tip is fixed on the needle seat.

[0024] The technical solution of the present invention has the following advantages:

[0025] 1. In the needle-puncture-proof fluid delivery device provided by the present invention, an opening is formed between the baffle and the protective sheet body. When the protective sheet is in the first state, the opening is arranged to face away from the needle tube. Compared with the original structure in which the outer wall of the needle tube directly abuts against the end of the baffle away from the protective sheet body, by arranging the opening to face away from the needle tube, when the needle tube contacts the protective sheet body, the protective sheet body can be a plane or a smooth curved surface. When the needle tube contacts the connection between the protective sheet body and the baffle, the connection between the baffle and the protective sheet body is easily chamfered due to the process. In either case, the original sharp contact between the needle tube and the baffle can be avoided, thereby alleviating the stress concentration phenomenon and preventing the needle tube from deforming. Moreover, there is no need to bend the end of the baffle away from the protective sheet body, which reduces the process flow, reduces the processing difficulty, and is conducive to reducing production costs.

[0026] 2. In the needle-puncture-proof fluid delivery device provided by the present invention, the connection between the baffle and the protective sheet body abuts against the needle tube. This structural form, on the one hand, is simple in structure and easy to process and form, and on the other hand, the connection between the baffle and the protective sheet body can be chamfered, which is conducive to increasing the contact area between the needle tube and the protective sheet and alleviating the stress concentration phenomenon.

[0027] 3. The needle-puncture-proof fluid delivery device provided by the present invention is provided with a clearance hole on the protective sheet body, which can not only transform the protective sheet from the first state to the second state, but also play a certain limiting role on the needle tube because the clearance hole is a closed-loop structure.

[0028] 4. In the needle-puncture-proof fluid delivery device provided by the present invention, the protective sheet is inserted into the accommodating cavity through an elastic card body, which is not only convenient for installation but also can improve the fixing effect of the protective sheet. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0030] Figure 1 It is a schematic diagram of the overall structure of the needle-puncture-proof fluid delivery device in an embodiment of the present invention;

[0031] Figure 2 It is a schematic structural diagram of a protective sheet in the needle-puncture-proof fluid delivery device according to an embodiment of the present invention when it is in a first state;

[0032] Figure 3It is a structural schematic diagram of a protective sheet in the needle-puncture-proof fluid delivery device according to an embodiment of the present invention when it is in a second state at one viewing angle;

[0033] Figure 4 It is a structural schematic diagram from another viewing angle when the protective sheet in the needle-puncture-proof fluid delivery device according to an embodiment of the present invention is in the second state;

[0034] Figure 5 for Figure 1 A schematic diagram of a structure of a protective sheet in FIG.

[0035] Figure 6 for Figure 1 A schematic diagram of the structure of the protective seat;

[0036] Figure 7 for Figure 1 Schematic diagram of the structure of the needle tube;

[0037] Figure 8 for Figure 1 A schematic diagram of the structure of the catheter seat;

[0038] Fig. 9 for Figure 1 A schematic diagram of the structure of the catheter in FIG.

[0039] Fig.10 for Figure 1 Another structural schematic diagram of the protective sheet in FIG.

[0040] Fig.11 for Figure 1 Schematic diagram of the structure of the needle holder.

[0041] Description of reference numerals:

[0042] 1. Catheter seat; 2. Protective seat; 3. Needle tube;

[0043] 4. Needle seat; 5. Protective sheet; 6. Baffle;

[0044] 7. Make way through hole; 8. Card; 9. Limiting piece;

[0045] 10. Distal hole; 11. Middle hole; 12. Proximal hole;

[0046] 13. Guide block; 14. Limit block; 15. Accommodating cavity;

[0047] 16. notch; 17. catheter; 18. limiting ring;

[0048] 19. Needle tip; 20. Flange. DETAILED DESCRIPTION

[0049] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0050] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0051] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0052] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0053] In this embodiment, the fluid referred to in the needle-puncture-proof fluid delivery device may be blood or liquid medicine.

[0054] Figure 1 Schematic diagram of the overall structure of the needle-puncture-proof fluid delivery device in an embodiment of the present invention; Figure 2 It is a schematic structural diagram of a protective sheet in the needle-puncture-proof fluid delivery device according to an embodiment of the present invention when it is in a first state; Figure 3 It is a structural schematic diagram of a protective sheet in the needle-puncture-proof fluid delivery device according to an embodiment of the present invention when it is in a second state at one viewing angle; Figure 4 It is a structural schematic diagram from another viewing angle when the protective sheet in the needle-puncture-proof fluid delivery device according to an embodiment of the present invention is in the second state; Figure 5 for Figure 1 A schematic diagram of a structure of a protective sheet in FIG. Figure 6 for Figure 1 A schematic diagram of the structure of the protective seat; Figure 7 for Figure 1The schematic diagram of the needle tube structure in FIG. Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 as well as Figure 7 As shown, the present embodiment provides a needle-puncture-proof fluid delivery device, comprising: a catheter 17 seat 1 structure; a needle tube structure, comprising a needle tube 3, and a needle tip 19 of the needle tube 3 can pass through the catheter 17 seat 1 structure; a protection structure, which is sleeved on the needle tube 3 and comprises a protection sheet 5, the protection sheet 5 comprises a protection sheet body, and a blocking sheet 6 extending from one end of the protection sheet body, and an opening is formed between the blocking sheet 6 and the protection sheet body; the protection sheet 5 has a first state of pressing against the needle tube 3, and a second state of shielding the needle tip 19; when the protection sheet 5 is in the first state, the opening faces away from the needle tube 3.

[0055] Specifically, the protective sheet body and the baffle 6 can both be planar, in which case the needle tube 3 can abut against the protective sheet body, or the needle tube 3 can abut against the connection between the protective sheet body and the baffle 6. For example, the protective sheet body can also be a curved surface with a certain curvature and protrude in the direction away from the baffle 6. In this case, the needle tube 3 can also abut against the protruding portion of the protective sheet body. This arrangement avoids the needle tube 3 abutting against the end of the baffle 6 away from the protective sheet body, thereby alleviating stress concentration and preventing the needle tube 3 from deforming. Moreover, there is no need to bend the baffle 6.

[0056] The needle-puncture-proof fluid delivery device provided by the present invention has an opening formed between the baffle and the protective sheet body. When the protective sheet is in the first state, the opening is arranged to face away from the needle tube. Compared with the original structure in which the outer wall of the needle tube directly abuts against the end of the baffle away from the protective sheet body, by arranging the opening to face away from the needle tube, when the needle tube contacts the protective sheet body, the protective sheet body can be a plane or a smooth curved surface. When the needle tube contacts the connection between the protective sheet body and the baffle, due to the process, the connection between the baffle and the protective sheet body is easily chamfered. In either case, the original sharp contact between the needle tube and the baffle can be avoided, thereby alleviating stress concentration and preventing deformation of the needle tube. Moreover, there is no need to bend the end of the baffle away from the protective sheet body, which reduces the process flow, reduces the processing difficulty, and is conducive to reducing production costs.

[0057] In this embodiment, when the protective sheet 5 is in the first state, the connection between the baffle 6 and the protective sheet body abuts against the needle tube 3. For example, the connection between the baffle 6 and the protective sheet body can be chamfered to increase the contact area between the needle tube 3 and the protective sheet 5 and alleviate stress concentration.

[0058] In this embodiment, a clearance space is provided on the protective sheet body, and the protective sheet body and the baffle 6 form a protective space; the needle tube 3 switches the protective sheet 5 from the first state to the second state through the clearance space; and when the protective sheet 5 is in the second state, the needle tip 19 is located in the protective space.

[0059] As for the clearance space, the clearance space can be a groove opened at the edge of the protection sheet body, or can be a clearance through hole 7 opened in the middle of the protection sheet body.

[0060] For example, the clearance hole 7 is a strip-shaped through hole, and the length direction of the strip-shaped through hole is consistent with the length direction of the protective sheet body. This arrangement can not only transform the protective sheet 5 from the first state to the second state, but also play a certain role in limiting the needle tube 3 because the clearance hole 7 is a closed loop structure.

[0061] As for the protection space, it is formed by the side of the baffle 6 facing away from the needle tube 3 seat structure and one side of the protection sheet body. When the needle tip 19 is in the clearance space, the baffle 6 blocks the distal hole 10 on the protection seat 2. When the needle tip 19 is facing upward, it is supported by the baffle 6. In combination with the clearance space, the middle hole 11 and the distal hole 10, the needle tube 3 can be prevented from moving in its own radial direction, thereby playing a role in preventing needle sticks.

[0062] Figure 8 for Figure 1 The structural diagram of the catheter seat in FIG. Figure 8 As shown, in this embodiment, the catheter seat structure includes a mounting cavity, and a notch 16 provided on the outer peripheral wall of the catheter seat structure and connected to the mounting cavity; when the protective sheet 5 is in a first state, the baffle 6 extends into the notch 16; when the protective sheet 5 is in a second state, the baffle 6 retracts from the notch 16 into the mounting cavity.

[0063] Fig. 9 for Figure 1 Schematic diagram of the structure of the catheter in FIG. Fig. 9 As shown, the catheter seat structure includes a catheter 17 and a catheter seat 1. A notch 16 is provided on the catheter seat 1, and the shape of the notch 16 can be designed according to the shape of the baffle 6, and the size of the notch 16 matches the size of the baffle 6. When the protective sheet 5 is in the first state, the baffle 6 extends out of the installation cavity through the notch 16, which can prevent the protective sheet 5 from falling off from the catheter seat structure. When the needle tube 3 needs to be pulled out, the baffle 6 retracts from the notch 16 into the installation cavity, and the needle tube 3 together with the protective sheet 5 can be pulled out of the installation cavity.

[0064] In this embodiment, the protection structure further includes a protection seat 2, which includes a protection seat 2 body through which the needle tube 3 can pass, and a receiving cavity 15 formed in the protection seat 2 body and receiving part of the needle tube 3; the protection sheet 5 is installed on the protection seat 2 body and received in the receiving cavity 15. The receiving cavity 15 can penetrate the outer side wall of the protection seat 2 body, so that the protection sheet 5 and the needle tube 3 can be installed in the receiving cavity 15 conveniently.

[0065] In this embodiment, at least one card body is disposed at one end of the protection sheet body away from the blocking sheet 6 , and the card body is snapped into the accommodating cavity 15 , and is suitable for fixing the protection sheet 5 on the protection seat 2 .

[0066] For example, there are two card bodies, which are arranged oppositely on two sides of the protection sheet body.

[0067] For example, the card body includes a card 8, a limiting piece 9 is provided on the card 8, and a limiting block 14 is provided at a corresponding position of the inner side wall of the accommodating cavity 15. When the card 8 is inserted into the accommodating cavity 15, the limiting piece 9 abuts against the limiting block 14. The card 8 can be a thin metal sheet with a certain elasticity. The card 8 can be rectangular as a whole. A limiting piece 9 is provided on the side of the card 8 that contacts the inner side wall of the accommodating cavity 15. The limiting piece 9 can also be square, and the size of the limiting piece 9 is smaller than the size of the card 8. Among them, the side of the limiting piece 9 facing away from the protective seat 2 is tilted in the direction away from the card 8, so that the elastic force can be increased and the fixing effect can be improved. Among them, in order to further improve the fixing effect of the protective sheet 5, a limiting block 14 can also be provided at a corresponding position of the inner side wall of the accommodating cavity 15, and the limiting block 14 extends in a direction close to the needle tube 3. When the protective sheet 5 is placed in the accommodating cavity 15, the limiting piece 9 abuts against the limiting block 14.

[0068] Fig.10 for Figure 1 Another structural schematic diagram of the protective sheet in FIG. Fig.10 As shown, in another embodiment, the card body is a limit ring 18 arranged along the circumferential direction of the protective sheet body, and the bottom of the accommodating cavity 15 is provided with a limit body extending along the length direction of the needle tube 3, and when the protective sheet 5 is located in the accommodating cavity 15, the inner side wall of the limit ring 18 abuts against the limit body. For example, the limit ring 18 can be made of thin metal with a certain elasticity, and when the limit ring 18 is located in the accommodating cavity 15, there is a certain elastic force between the limit ring 18 and the inner side wall of the accommodating cavity 15, which is conducive to improving the fixing effect.

[0069] In this embodiment, when the protective sheet 5 is in the first state, the angle formed between the protective sheet body and the needle tube 3 is in the range of 8°-12°; for example, when the protective sheet 5 is in the first state, the angle formed between the protective sheet body and the needle tube 3 is 10°. When the protective sheet 5 is in the second state, the angle formed between the protective sheet body and the needle tube 3 is in the range of 22°-26°; for example, when the protective sheet 5 is in the second state, the angle formed between the protective sheet body and the needle tube 3 is 24°.

[0070] In this embodiment, the end surface of the protective seat 2 close to the needle tip 19 is provided with a distal hole 10, and the end surface of the protective seat 2 away from the needle tip 19 is provided with a proximal hole 12; the outer wall of the needle tube 3 is provided with a flange 20, and the cross section of the flange 20 is smaller than the aperture size of the proximal hole 12. When the needle is pulled out, as the needle tube 3 is pulled out, the flange 20 on the needle tube 3 is stuck by the proximal hole 12, so that the needle tube 3 cannot fall off from the protective seat 2.

[0071] In this embodiment, the distance between the flange 20 and the needle tip 19 is smaller than the distance between the baffle 6 and the proximal hole 12 on the protection seat 2. In this way, the needle tip 19 can move into the protection space through the clearance space before the flange 20 is stuck by the proximal hole 12.

[0072] In this embodiment, a guide block 13 is provided in the accommodating cavity 15, and a middle hole 11 is provided on the guide block 13. The extension direction of the middle hole 11 is consistent with the extension direction of the needle tube 3. The thickness of the guide block 13 can be designed according to actual needs. The needle tube 3 passes through the distal hole 10, the middle hole 11 and the proximal hole 12 in sequence. The straight line where the three are located coincides with the needle tube 3, which can play a role in precise guidance. At the same time, the inner wall of the middle hole 11 can also play a certain supporting role for the needle tube 3 to prevent the needle tube 3 from being deformed when the protective sheet 5 is in the first state.

[0073] In this embodiment, when the protective sheet 5 is in the first state, the protective seat 2 is at least partially located in the catheter seat structure. For example, the protective seat 2 can be a cylindrical structure as a whole, and the diameter of the upper half of the protective seat 2 close to the catheter seat structure can be smaller than the diameter of the lower half. When installed, the upper half of the protective seat 2 can be inserted into the installation cavity.

[0074] In this embodiment, the protective sheet 5 is in a Z-shaped structure as a whole. When in use, the protective sheet 5 is fixed in the accommodating cavity 15 by the card body of the lower part of the protective sheet 5; the protective sheet 5 is fixed in the installation cavity by the baffle 6 of the upper part of the protective sheet 5; before the needle is removed, the needle tube 3 is supported by the connection between the protective sheet body and the baffle 6; after the needle is removed, the needle tip 19 is protected by the protective space formed between the protective sheet body and the baffle 6 to prevent the user from being stabbed.

[0075] Fig.11 for Figure 1The schematic diagram of the needle holder in FIG. Fig.11 As shown, in this embodiment, the needle tube structure also includes a needle seat 4, and the end of the needle tube 3 away from the needle tip 19 is fixed on the needle seat 4. During installation, the end of the needle tube 3 away from the needle tip 19 passes through the distal hole 10, the middle hole 11 and the proximal hole 12 in sequence, and finally can be bonded to the installation hole at the corresponding position on the needle seat 4, which can facilitate puncture and needle removal.

[0076] During installation, the catheter 17 and the catheter seat 1 can be assembled first, and then the end of the needle tube 3 away from the needle tip 19 can be passed through the distal hole 10, the middle hole 11 and the proximal hole 12 in sequence, and the needle tube 3 and the needle seat 4 can be assembled, and then the protective sheet 5 can be installed in the accommodating cavity 15 in the protective seat 2. At this time, pay attention to adjust the position relationship between the needle tube 3 and the protective sheet 5 so that the protective sheet 5 is in the first state, and finally the protective seat 2 is inserted into the catheter seat 1 so that the blocking sheet 6 extends out from the notch 16.

[0077] During use, force is applied through the needle seat 4, and after the puncture is completed, the catheter 17 is retained in the patient's body. Force is applied again through the needle seat 4 to pull out the needle tube 3. As the needle tube 3 is pulled out, the positional relationship between the protective sheet 5 and the needle tube 3 changes, and the protective sheet 5 changes from the first state to the second state. At this time, the needle tip 19 first passes through the clearance hole 7, and then under the action of the flange 20 and the proximal hole 12, the needle tube 3 cannot continue to move downward. At this time, the needle tip 19 is restricted in the clearance space. The protective sheet 5 recovers its deformation as the needle tube 3 moves, and the baffle 6 retracts from the notch 16. At this time, the protective seat 2, the protective sheet 5 and the needle tube 3 can be pulled out of the catheter seat 1.

[0078] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A needle-puncture-proof fluid delivery device, It is characterized in that include: Catheter seat structure; A needle tube structure, comprising a needle tube, the needle tip of which can pass through the catheter seat structure; A protective structure is sleeved on the needle tube and includes a protective sheet, the protective sheet includes a protective sheet body and a blocking sheet extending from one end of the protective sheet body, an opening is formed between the blocking sheet and the protective sheet body; the protective sheet has a first state of pressing against the needle tube and a second state of shielding the needle tip; when the protective sheet is in the first state, the opening faces away from the needle tube; When the protection sheet is in the first state, the connection between the blocking sheet and the protection sheet body abuts against the needle tube; The protective sheet body is provided with a clearance space, and the protective sheet body and the blocking sheet enclose a protective space; the needle tube passes through the clearance space to switch the protective sheet from the first state to the second state; and when the protective sheet is in the second state, the needle tip is located in the protective space; The make way space is a make way through hole.

2. The needle-stick-proof fluid delivery device according to claim 1, It is characterized in that The relinquishing through hole is a strip-shaped through hole, and the length direction of the strip-shaped through hole is consistent with the length direction of the protective sheet body.

3. The needle-stick-proof fluid delivery device according to claim 1, It is characterized in that The catheter seat structure includes an installation cavity, and a notch provided on the outer peripheral wall of the catheter seat structure and connected to the installation cavity; when the protective sheet is in a first state, the blocking sheet extends into the notch; when the protective sheet is in a second state, the blocking sheet retracts from the notch into the installation cavity.

4. The needle-stick-proof fluid delivery device according to any one of claims 1 to 2, It is characterized in that The protection structure further includes a protection seat, wherein the protection seat includes a protection seat body through which the needle tube can pass, and an accommodating cavity formed in the protection seat body and accommodating a portion of the needle tube; The protection sheet is installed on the protection seat body and accommodated in the accommodation cavity.

5. The needle-stick-proof fluid delivery device according to claim 4, It is characterized in that At least one card body is disposed at one end of the protection sheet body away from the blocking sheet. The card body is snap-connected in the accommodating cavity and is suitable for fixing the protection sheet on the protection seat.

6. The needle-stick-proof fluid delivery device according to claim 5, It is characterized in that The card bodies are two in number and are arranged oppositely on two sides of the protection sheet body.

7. The needle-stick-proof fluid delivery device according to claim 5, It is characterized in that The card body comprises a card, a limiting piece is arranged on the card, a limiting block is arranged at a corresponding position of the inner side wall of the accommodating cavity, and when the card is inserted into the accommodating cavity, the limiting piece abuts against the limiting block.

8. The needle-stick-proof fluid delivery device according to claim 5, It is characterized in that The card body is a limiting ring arranged along the circumferential direction of the protective sheet body, and the bottom of the accommodating cavity is provided with a limiting body extending along the length direction of the needle tube. When the protective sheet is located in the accommodating cavity, the inner side wall of the limiting ring abuts against the limiting body.

9. The needle-stick-proof fluid delivery device according to any one of claims 1 to 2, It is characterized in that When the protective sheet is in the first state, the angle formed between the protective sheet body and the needle tube is in the range of 8° to 12°; When the protection sheet is in the second state, the angle formed between the protection sheet body and the needle tube is in the range of 22°-26°.

10. The needle-stick-proof fluid delivery device according to claim 4, It is characterized in that The end surface of the protective seat close to the needle tip is provided with a distal hole, and the end surface of the protective seat away from the needle tip is provided with a proximal hole; The outer side wall of the needle tube is provided with a flange, and the cross section of the flange is smaller than the aperture size of the proximal hole.

11. The needle-stick-resistant fluid delivery device according to claim 10, It is characterized in that The distance between the flange and the needle tip is smaller than the distance between the blocking sheet and the proximal hole on the protection seat.

12. The needle-stick-resistant fluid delivery device according to claim 4, It is characterized in that A guide block is arranged in the accommodating cavity, a middle hole is arranged on the guide block, and an extending direction of the middle hole is consistent with an extending direction of the needle tube.

13. The needle-stick-resistant fluid delivery device according to claim 4, It is characterized in that When the protection sheet is in the first state, the protection seat is at least partially located within the catheter seat structure.

14. The needle-stick-resistant fluid delivery device according to claim 5, It is characterized in that The protective sheet is in a Z-shaped structure as a whole.

15. The needle-stick-proof fluid delivery device according to any one of claims 1 to 2, It is characterized in that The needle tube structure also includes a needle seat, and one end of the needle tube away from the needle tip is fixed on the needle seat.

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