Retractable blood taking needle

Abstract

The utility model provides a retraction type blood taking needle, relates to the blood taking needle technical field, the retraction type blood taking needle comprises a condom, a vein end needle seat and an elastic trigger piece, the condom is sleeved on the vein end needle seat, the condom is provided with a spacing hole, the fixed end of the elastic trigger piece is connected with the vein end needle seat, and the elastic trigger piece is connected with the vein end needle seat. The free end of the elastic trigger piece extends out of the limiting hole and enables the elastic trigger piece to be clamped at the position of the limiting hole, the retractable blood taking needle comprises a protective sleeve, the protective sleeve is arranged on the safety sleeve in a sleeving mode, the protective sleeve covers the free end of the elastic trigger piece, and the protective sleeve is used for moving in the axial direction of the safety sleeve. And the elastic triggering piece is driven to deform towards the vein end needle seat so as to enter the condom. According to the retraction type blood taking needle, the risk that the elastic triggering piece is triggered by mistake can be greatly reduced, and the retraction type blood taking needle can be prevented from being accidentally scrapped in advance.

Description

Technical Field

[0001] The utility model relates to the technical field of blood collection needles, and particularly to a retractable blood collection needle. Background Art

[0002] The blood collection needle is used for blood collection and is quite widely used in clinics. Before use, the needle tube of the blood collection needle is generally protected by a sheath. When blood collection is needed, medical staff pull out the sheath and insert the needle tube into the patient's skin. After blood collection, the needle tube is exposed outside, which is extremely easy to cause harm to medical staff. If the previous sheath is put back, it will cause secondary use of the sheath, resulting in potential safety hazards, and the sheath is also easily punctured by the needle tube. Based on this, the prior art provides a retractable blood collection needle, which includes a safety cover, a venous end needle tube, a venous end needle seat, a spring and an elastic trigger. The venous end needle tube is connected to the venous end needle seat, the safety cover is sleeved on the venous end needle seat, and a limiting hole is arranged on the safety cover; before the retractable blood collection needle is used, the fixed end of the elastic trigger is connected to the venous end needle seat, and the free end of the elastic trigger extends out of the limiting hole so that the elastic trigger is clamped at the limiting hole; when the venous end needle tube finishes blood collection, medical staff can release the clamping relationship between the elastic trigger and the limiting hole by pressing the free end of the elastic trigger into the safety cover (this action can be called triggering the elastic trigger), and then the spring drives the venous end needle seat to move relative to the safety cover, and then drives the venous end needle tube to enter the safety cover, realizing the shielding of the venous end needle tube, and further preventing the exposed venous end needle tube from accidentally injuring patients or medical staff. However, before this retractable blood collection needle is used, since the free end of the elastic trigger is exposed at the limiting hole, it is easy to be accidentally triggered, resulting in the venous end needle tube retracting into the safety cover, causing the retractable blood collection needle to be scrapped before it is used, and when accidentally triggered, the accidentally retracted venous end needle tube is also easy to accidentally injure people. Content of the Utility Model

[0003] The utility model aims to solve the problem that the free end of the elastic trigger of the existing retractable blood collection needle is easily accidentally pressed and triggered.

[0004] To solve the above problems, the utility model provides a retractable blood collection needle, which includes a safety cover, a venous end needle seat and an elastic trigger. The safety cover is sleeved on the venous end needle seat, a limiting hole is arranged on the safety cover, the fixed end of the elastic trigger is connected to the venous end needle seat, the free end of the elastic trigger is used for extending out of the limiting hole and making the elastic trigger clamped at the limiting hole. The retractable blood collection needle further includes a protective cover, the protective cover is sleeved on the safety cover, and the protective cover covers the free end of the elastic trigger. The protective cover is used for moving axially along the safety cover to drive the free end of the elastic trigger to deform towards the venous end needle seat and enter the safety cover.

[0005] A retractable blood collection needle provided by the present utility model has, compared with the prior art, but is not limited to the following technical effects:

[0006] Before the retractable blood collection needle is used, although the free end of the elastic trigger member extends and is exposed at the limiting hole, the free end of the elastic trigger member can be covered by a protective sleeve sleeved on the condom. In this way, during the transportation or transfer of the retractable blood collection needle, the risk that the free end of the elastic trigger member is accidentally pressed by an external object or person and the venous end needle seat drives the venous end needle tube to retract into the condom in advance is greatly reduced, and the risk that medical staff accidentally press the free end of the elastic trigger member and the venous end needle seat drives the venous end needle tube to retract into the condom in advance is also greatly reduced, greatly improving the safety of the retractable blood collection needle. After the medical staff finishes blood collection using the retractable blood collection needle, the medical staff can drive the protective sleeve to move axially along the condom, and then drive the free end of the elastic trigger member to deform towards the venous end needle seat and enter the condom through the moving protective sleeve to complete the triggering of the elastic trigger member. Among them, the force for driving the free end of the elastic trigger member to deform by moving the protective sleeve is much greater than the force for directly pressing and deforming the free end of the elastic trigger member of the existing retractable blood collection needle, greatly reducing the risk of accidental triggering of the elastic trigger member.

[0007] Further, the protective sleeve is provided with a notch, the size of the notch along the circumference of the condom is smaller than the outer diameter of the condom, and the protective sleeve is used to be sleeved on the condom through the notch.

[0008] Further, the protective sleeve includes a first part and two oppositely arranged second parts. One ends of the two second parts are connected by the first part, a gap is formed between the other ends of the two second parts, and the mutually adjacent side surfaces of the second parts are respectively attached to the outer wall of the condom. The protective sleeve is used to drive the free end of the elastic trigger member through the first part.

[0009] Further, a first guiding protrusion is convexly arranged on the outer wall of the condom. The first guiding protrusion extends along the axial direction of the condom, and the first guiding protrusion is oppositely arranged with the limiting hole. One ends of the two second parts far away from the first part respectively abut against the first guiding protrusion.

[0010] Further, second guiding protrusions are respectively convexly arranged on opposite sides of the condom relative to the limiting hole. The second guiding protrusions extend along the axial direction of the condom. In the circumferential direction of the condom, the two second parts are respectively located between the corresponding first guiding protrusion and the second guiding protrusion.

[0011] Further, a driving bump is protrudingly provided on one side of the first part facing the condom. The driving bump has an inclined guiding wall, which is arranged non-perpendicular and non-parallel to the axial direction of the condom. The inclined guiding wall is used to abut against the free end of the elastic trigger member.

[0012] Further, the retractable blood collection needle further includes a limiting sleeve fixedly sleeved on the condom. In the axial direction of the condom, the protective sleeve is located between the limiting sleeve and the fixed end of the elastic trigger member.

[0013] Further, a rib structure is protrudingly provided on the first part on the side away from the condom in the radial direction of the condom.

[0014] Further, the retractable blood collection needle further includes a spring and a venous end needle tube. One end of the venous end needle tube is connected to one end of the venous end needle seat. The spring is arranged between the axial directions of the venous end needle seat and the condom. When the free end of the elastic trigger member is caught in the limiting hole, the spring is compressed. When the free end of the elastic trigger member enters the condom, the spring drives the venous end needle seat to move, thereby driving the venous end needle seat into the condom.

[0015] Further, an annular protrusion is protrudingly provided on the outer wall of the venous end needle seat. The two ends of the spring respectively act on the condom and the annular protrusion. A through groove is further provided on the side wall of the condom. One end of the through groove extends to form an elastic piece, and a positioning protrusion is protrudingly provided on the inner wall of the condom. The spring is used to drive the venous end needle seat to move until the annular protrusion moves between the elastic piece and the positioning protrusion. Description of the Drawings

[0016] Figure 1 is a schematic structural diagram of the retractable blood collection needle according to an embodiment of the present invention;

[0017] Figure 2 is a partial structural schematic diagram of the retractable blood collection needle according to an embodiment of the present invention;

[0018] Figure 3 is a schematic structural diagram of the protective sleeve according to an embodiment of the present invention;

[0019] Figure 4 is an assembly schematic diagram of the protective sleeve and the condom according to an embodiment of the present invention Figure 1 ;

[0020] Figure 5 is an assembly schematic diagram of the protective sleeve and the condom according to an embodiment of the present invention Figure 2 ;

[0021] Figure 6 is Figure 2 vertical sectional structure schematic diagram;

[0022] Figure 7 is Figure 2 horizontal sectional structure schematic diagram.

[0023] Description of reference numerals:

[0024] 1. Condom; 11. Limit hole; 12. First guiding protrusion; 13. Second guiding protrusion; 14. Through groove; 141. Elastic piece; 15. Positioning protrusion; 2. Venous end needle holder; 21. Annular protrusion; 3. Elastic trigger member; 31. Fixed end; 32. Free end; 4. Venous end needle tube; 5. Spring; 6. Protective sleeve; 61. First part; 611. Driving protrusion; 6111. Inclined guiding wall; 612. Rib structure; 62. Second part; 63. Notch; 7. Limit sleeve; 8. Venous end sheath; 91. Catheter; 92. Infusion port needle holder; 93. Infusion port sheath. Detailed implementation manners

[0025] To make the above objects, features and advantages of the present utility model more obvious and understandable, the following detailed description will be given to the specific embodiments of the present utility model with reference to the accompanying drawings. Although some embodiments of the present utility model are shown in the drawings, it should be understood that the present utility model can be implemented in various forms and should not be construed as limited to the embodiments described herein. On the contrary, these embodiments are provided to more thoroughly and completely understand the present utility model. It should be understood that the drawings and embodiments of the present utility model are only for exemplary purposes and are not used to limit the protection scope of the present utility model.

[0026] The X-axis in the drawings represents the horizontal direction and is designated as the front-back position, and the positive direction of the X-axis represents the front side, and the reverse direction of the X-axis represents the rear side; the Y-axis in the drawings represents the left-right position, and the positive direction of the Y-axis represents the left side, and the reverse direction of the Y-axis represents the right side. At the same time, it should be noted that the above-mentioned meanings of the Y-axis and the X-axis are only for facilitating the description of the present utility model 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 a limitation to the present utility model.

[0027] As used herein, the term "comprising" and its variants are open-ended, that is, "including but not limited to"; the term "based on" means "at least partially based on"; the term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments"; the term "optionally" means "optional embodiment". The relevant definitions of other terms will be given in the following description. It should be noted that the concepts such as "first" and "second" mentioned in the present utility model are only used to distinguish different devices, modules or units, and are not used to limit the order or mutual dependence relationship of the functions performed by these devices, modules or units.

[0028] It should be noted that the modifications of "one" and "multiple" mentioned in the present utility model are illustrative rather than restrictive. Those skilled in the art should understand that unless otherwise clearly specified in the context, it should be understood as "one or more". The "connection" mentioned in the utility model should be understood as either direct connection or indirect connection unless otherwise clearly specified in the context.

[0029] See Figure 1-2 and Figure 6 , a retractable blood collection needle according to an embodiment of the present utility model includes a condom 1, a venous end needle seat 2 and an elastic trigger member 3. The condom 1 is sleeved on the venous end needle seat 2. A limiting hole 11 is provided on the condom 1. The fixed end 31 of the elastic trigger member 3 is connected to the venous end needle seat 2. The free end 32 of the elastic trigger member 3 is used to extend out of the limiting hole 11 and make the elastic trigger member 3 snap into the limiting hole 11. The retractable blood collection needle further includes a protective sleeve 6. The protective sleeve 6 is sleeved on the condom 1, and the protective sleeve 6 covers the free end 32 of the elastic trigger member. The protective sleeve 6 is used to move axially along the condom 1 to drive the free end 32 of the elastic trigger member 3 to deform towards the venous end needle seat 2 and enter the condom 1.

[0030] In this embodiment, before the retractable blood collection needle is used, the free end 32 of the elastic trigger member 3 extends and is exposed at the limiting hole 11. However, the free end 32 of the elastic trigger member 3 can be covered by the protective sleeve 6 sleeved on the condom 1. In this way, during the transportation or transfer of the retractable blood collection needle, the risk that the free end 32 of the elastic trigger member 3 is accidentally pressed by an external object or person and the venous end needle seat 2 drives the venous end needle tube 4 to retract into the condom 1 in advance is greatly reduced, and the risk that the medical staff accidentally presses the free end 32 of the elastic trigger member 3 and the venous end needle seat 2 drives the venous end needle tube 4 to retract into the condom 1 in advance is also greatly reduced, which greatly improves the safety of the retractable blood collection needle. After the medical staff completes blood collection using the retractable blood collection needle, the medical staff can drive the protective sleeve 6 to move axially along the condom 1, and then drive the free end 32 of the elastic trigger member 3 to deform towards the venous end needle seat 2 and enter the condom 1 through the moving protective sleeve 6 to complete the triggering of the elastic trigger member 3. Among them, the force for driving the free end 32 of the elastic trigger member 3 to deform by moving the protective sleeve 6 is much greater than the force for directly pressing and deforming the free end 32 of the elastic trigger member 3 of the existing retractable blood collection needle, which greatly reduces the risk of accidental triggering of the elastic trigger member 3.

[0031] It should be noted that for the retractable blood collection needle provided by the present invention, the same as the prior art, the retractable blood collection needle further includes a spring 5 and a venous end needle tube 4. One end of the venous end needle tube 4 is connected to one end of the venous end needle seat 2, and the spring 5 is arranged axially between the venous end needle seat 2 and the condom 1; when the elastic trigger member 3 is clamped in the limiting hole 11, the spring 5 is compressed; when the free end 32 of the elastic trigger member 3 enters the condom 1 and the clamping connection between the elastic trigger member 3 and the limiting hole 11 is released, the spring 5 drives the venous end needle seat 2 to move and drives the venous end needle seat 2 to enter the condom 1.

[0032] Here, as Figure 6 shown, the rear end of the venous end needle tube 4 is connected to the front end of the venous end needle seat 2. When the retractable blood collection needle is not in use, the elastic trigger member 3 is clamped into the limiting hole 11 of the condom 1. At this time, the spring 5 is compressed, and at this time, since there is a vertical interval between the free end 32 of the elastic trigger member 3 and the venous end needle seat 2, that is, the overall extending direction of the elastic trigger member 3 is set at an acute angle to the axial direction of the venous end needle seat 2 at this time; specifically, the elastic trigger member 3 is clamped and matched with the rear side edge of the limiting hole 11. At this time, the compressed spring 5 cannot drive the venous end needle to move backward, and thus cannot drive the venous end needle tube 4 to move backward into the condom 1.

[0033] As Figure 1As shown, the retractable blood collection needle may further include a venous end sheath 8. Since the venous end needle seat 2 protrudes forward from the condom 1 when the elastic trigger 3 is not triggered, in order to ensure that the venous end needle tube 4 protruding from the condom 1 is not contaminated before the retractable blood collection needle is used, and also to ensure that the venous end needle tube 4 protruding from the condom 1 does not accidentally injure people, the venous end sheath 8 can be sleeved on the venous end needle tube 4.

[0034] When medical staff need to use the retractable blood collection needle to collect blood, first remove the venous end sheath 8, and then the venous end needle tube 4 protruding from the condom 1 can be used to pierce into the patient's venous blood vessel for blood drawing. After blood collection, in order to avoid the risks associated with the exposure of the venous end needle tube 4, as in the prior art, it is necessary to trigger the elastic trigger 3 so that the venous end needle tube 4 can enter the condom 1 to complete the shielding of the venous end needle.

[0035] See Figure 6 , when the venous end needle tube 4 has completed blood collection and the elastic trigger 3 needs to be triggered, the protective sleeve 6 can be driven to move backward. A part of the force of the protective sleeve 6 can drive the free end 32 of the elastic trigger 3 to deform in the direction close to the venous end needle seat 2, that is, drive the free end 32 of the elastic trigger 3 to deform downward. As the protective sleeve 6 moves to the right, the gradually downward-deforming free end 32 will completely enter the condom 1; when the free end 32 deforms downward into the condom 1, the compressed spring 5 will release elastic force, and the released elastic force will drive the venous end needle seat 2 to move backward to drive the venous end needle tube 4 into the condom 1 to complete the shielding of the venous end needle tube 4.

[0036] See Figure 2 、 Figure 4 and Figure 6-7 , when the shielding of the venous end needle tube 4 is completed, to ensure that the venous end needle tube 4 does not move relative to the condom 1. Based on this, a circular protrusion 21 is convexly provided on the outer wall of the venous end needle seat 2. The two ends of the spring 5 respectively act on the condom 1 and the circular protrusion 21. A through groove 14 is also provided on the side wall of the condom 1. One end of the through groove 14 extends to form an elastic piece 141, and a positioning protrusion 15 is convexly provided on the inner wall of the condom 1; the spring 5 is used to drive the venous end needle seat 2 to move until the circular protrusion 21 moves between the elastic piece 141 and the positioning protrusion 15.

[0037] Among them, in the natural state of the elastic sheet 141, its rear end is located inside the condom 1 and thus also on the moving path of the annular protrusion 21. In this way, after the elastic trigger 3 is triggered by the protective sleeve 6, the spring 5 drives the venous end needle seat 2 to move to the right. The annular protrusion 21 of the venous end needle seat 2 will drive the rear end of the elastic sheet 141 to deform outward, and then the annular protrusion 21 will cross over the elastic sheet 141 and abut against the front side of the positioning protrusion 15. At this time, the elastic sheet 141 also returns to its natural state, and thus the rear end of the elastic sheet 141 abuts against the front side of the annular protrusion 21, realizing that the annular protrusion 21 moves between the elastic sheet 141 and the positioning protrusion 15, and finally realizing the fixation of the venous end needle seat 2 and the venous end needle tube 4.

[0038] See Figure 3-4 , optionally, the protective sleeve 6 is provided with a notch 63, the size of the notch 63 along the circumferential direction of the condom 1 is smaller than the outer diameter of the condom 1, and the protective sleeve 6 is used to be sleeved on the condom 1 through the notch 63.

[0039] In this embodiment, the protective sleeve 6 has a notch 63, and the size of the notch 63 along the circumferential direction of the condom 1 is smaller than the outer diameter of the condom 1. When assembling the retractable blood collection needle, the protective sleeve 6 can be expanded and deformed at the notch 63 to be sleeved on the mounting sleeve. After being sleeved on the mounting sleeve, in order for the protective sleeve 6 to restore the size of the notch 63 in the natural state, it will clamp on the protective sleeve 6 like a "clip", and the protective sleeve 6 will not fall off from the condom 1.

[0040] See Figure 3-4 , optionally, the protective sleeve 6 includes a first part 61 and two relatively arranged second parts 62. One ends of the two second parts 62 are connected by the first part 61, and a gap 63 is formed between the other ends of the two second parts 62. The relatively close side surfaces of the second parts 62 are respectively attached to the outer wall of the condom 1, and the protective sleeve 6 is used to drive the free end 32 of the elastic trigger 3 through the first part 61.

[0041] In this embodiment, the protective sleeve 6 specifically realizes the expansion of the notch 63 through the deformation of the two second parts 62, and thus realizes that the protective sleeve 6 is sleeved on the condom 1. After the protective sleeve 6 is sleeved on the condom 1, the relatively opposite side surfaces of the two second parts 62 also adhere to the left and right side walls of the condom 1. In this way, the second part 62 can move along the condom 1 successively to drive the free end 32 of the elastic trigger 3 into the condom 1 through the first part 61 to complete the triggering of the elastic trigger 3.

[0042] See Figure 3-5, optionally, a first guiding protrusion 12 is convexly provided on the outer wall of the condom 1. The first guiding protrusion 12 extends along the axial direction of the condom 1, and the first guiding protrusion 12 is disposed opposite to the limiting hole 11. One end of each of the two second portions 62 away from the first portion 61 abuts against the first guiding protrusion 12 respectively.

[0043] In this embodiment, the first guiding protrusion 12 and the limiting hole 11 are located on opposite sides of the condom 1. As Figure 3-5 shown, the limiting hole 11 is provided on the upper side of the condom 1, and the first guiding protrusion 12 is provided on the lower side of the condom 1. After the protective sleeve 6 is sleeved on the condom 1, the bottom ends of the two second portions 62 abut against the left and right sides of the first guiding protrusion 12 respectively. Thus, when it is necessary to trigger the elastic trigger 3, the second portion 62 of the protective sleeve 6 can move backward along the first guiding protrusion 12. In addition, the setting of the first guiding protrusion 12 can also prevent the protective sleeve 6 from rotating in the circumferential direction of the condom 1, thereby preventing the first portion 61 and the elastic trigger 3 from being misaligned in the circumferential direction of the condom 1.

[0044] See Figure 3-5 , optionally, second guiding protrusions 13 are convexly provided on the opposite sides of the condom 1 relative to the limiting hole 11. The second guiding protrusions 13 extend along the axial direction of the condom 1. In the circumferential direction of the condom 1, the two second portions 62 are respectively located between the corresponding first guiding protrusion 12 and the second guiding protrusion 13.

[0045] In this embodiment, second guiding protrusions 13 are respectively provided on the left and right sides of the condom 1 relative to the limiting hole 11. The first guiding protrusion 12 can enhance the structural strength of the condom 1 at this position. In addition, in the circumferential direction of the condom 1, the two second portions 62 are respectively located between the corresponding first guiding protrusion 12 and the second guiding protrusion 13. Thus, the stability of the protective sleeve 6 in the circumferential direction of the condom 1 can be further improved, and a better guiding effect for the protective sleeve 6 can also be provided.

[0046] See Figure 2-3 and Figure 6 , optionally, a driving protrusion 611 is convexly provided on the side of the first portion 61 facing the condom 1. The driving protrusion 611 has an inclined guiding wall 6111. The inclined guiding wall 6111 is neither perpendicular nor parallel to the axial direction of the condom 1. The inclined guiding wall 6111 is used to abut against the free end 32 of the elastic trigger 3.

[0047] In this embodiment, a driving protrusion 611 is protruded from the first part 61 on one side facing the condom 1. Specifically, a driving protrusion 611 is protruded from the first part 61 on one side facing the limiting hole 11. The inclined guide wall 6111 of the driving protrusion 611 is neither perpendicular nor parallel to the axial direction of the condom 1. The inclined guide wall 6111 is specifically inclined toward the rear side. Figure 6 As shown, when the elastic trigger member 3 needs to be triggered, the protective sleeve 6 is moved backward, and the inclined guide wall 6111 moves relative to the free end 32 of the elastic trigger member 3 and drives the free end 32 of the elastic trigger member 3 to deform downward until the free end 32 of the elastic trigger member 3 completely enters the condom 1.

[0048] See also Figure 2 , Figure 6-7 Optionally, the retractable blood collection needle also includes a limiting sleeve 7, which is fixedly mounted on the condom 1, and in the axial direction of the condom 1, the protective sleeve 6 is located between the limiting sleeve 7 and the fixed end 31 of the elastic trigger member 3.

[0049] In this embodiment, when the protective cover 6 is needed to trigger the elastic trigger member 3, since the protective cover 6 is located between the limiting cover 7 and the fixed end 31 of the elastic trigger member 3, the protective cover 6 is limited to only move close to the fixed end 31 of the elastic trigger member 3, that is, the protective cover 6 can only move backward to trigger the elastic trigger member 3.

[0050] See also Figure 2 and Figure 6 Optionally, the first portion 61 is provided with a convex rib structure 612 protruding from a side of the condom 1 away from the condom 1 in the radial direction.

[0051] In this embodiment, a convex rib structure 612 is further provided on the upper side of the first portion 61 . The convex rib structure 612 can provide a fulcrum for medical personnel, and the medical personnel can hold the convex rib structure 612 to drive the protective sleeve 6 to move.

[0052] See also Figure 1 The retractable blood collection needle also includes a catheter 91, a bottle end needle seat 92, a bottle end needle tube (not shown in the figure) and a bottle end sheath 93. The front end of the catheter 91 is fixed and connected to the rear end of the venous end needle seat 2, the front end of the venous end needle seat 2 is connected to the rear end of the venous end needle tube 4, the rear end of the catheter 91 is inserted into and connected to the bottle end needle seat 92, the front end of the bottle end needle tube is inserted into and connected to the rear end of the bottle end needle seat 92, and the bottle end sheath 93 is sleeved on the bottle end needle tube. The bottle end sheath 93 can be a rubber sheath with a closed rear end. When blood collection is required, the bottle end needle tube is inserted into the collection bottle together with the rubber sheath. Under the action of the squeezing force, the rubber sheath is deformed, and the rear end of the bottle end needle tube pierces the rubber sheath and extends into the collection bottle to achieve blood collection.

[0053] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature.

[0054] Although the present utility model is disclosed as above, the protection scope of the present utility model is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present utility model, and these changes and modifications will all fall within the protection scope of the present utility model.

Claims

1. A retractable blood collection needle, comprising a safety cover (1), a venous end needle seat (2) and an elastic trigger member (3), wherein the safety cover (1) is sleeved on the venous end needle seat (2), a limiting hole (11) is provided on the safety cover (1), a fixed end (31) of the elastic trigger member (3) is connected to the venous end needle seat (2), and a free end (32) of the elastic trigger member (3) is used to extend out of the limiting hole (11) and enable the elastic trigger member (3) to be clamped at the limiting hole (11), characterized in that: The invention also comprises a protective sleeve (6), wherein the protective sleeve (6) is sleeved on the condom (1), and the protective sleeve (6) covers the free end (32) of the elastic trigger member (3), and the protective sleeve (6) is used to move along the axial direction of the condom (1) to drive the free end (32) of the elastic trigger member (3) to deform toward the venous end needle seat (2) and enter the condom (1).

2. The retractable blood collection needle according to claim 1, characterized in that: The protective sleeve (6) is provided with a notch (63), the size of the notch (63) along the circumference of the condom (1) being smaller than the outer diameter of the condom (1), and the protective sleeve (6) is used to be sleeved on the condom (1) through the notch (63).

3. The retractable blood collection needle according to claim 2, characterized in that: The protective sleeve (6) comprises a first part (61) and two second parts (62) arranged opposite to each other, one end of the two second parts (62) being connected via the first part (61), the notch (63) being formed between the other ends of the two second parts (62), the adjacent side surfaces of the second parts (62) respectively being in contact with the outer wall of the condom (1), and the protective sleeve (6) being used to drive the free end (32) of the elastic trigger member (3) via the first part (61).

4. The retractable blood collection needle according to claim 3, characterized in that: A first guide protrusion (12) is protruded from the outer wall of the condom (1), and the first guide protrusion (12) extends along the axial direction of the condom (1). The first guide protrusion (12) is arranged opposite to the limiting hole (11), and one end of the two second parts (62) away from the first part (61) respectively abuts against the first guide protrusion (12).

5. The retractable blood collection needle according to claim 4, characterized in that: The condom (1) is provided with second guide protrusions (13) on opposite sides of the limiting hole (11), respectively. The second guide protrusions (13) extend along the axial direction of the condom (1), and in the circumferential direction of the condom (1), the two second parts (62) are respectively located between the corresponding first guide protrusions (12) and the second guide protrusions (13).

6. The retractable blood collection needle according to claim 3, characterized in that: The first part (61) is provided with a driving protrusion (611) protruding toward one side of the condom (1), and the driving protrusion (611) has an inclined guide wall (6111), and the inclined guide wall (6111) is arranged non-perpendicularly and non-parallel to the axial direction of the condom (1), and the inclined guide wall (6111) is used to abut against the free end (32) of the elastic trigger member (3).

7. The retractable blood collection needle according to claim 3, characterized in that: It also comprises a limiting sleeve (7), wherein the limiting sleeve (7) is fixedly mounted on the safety condom (1), and in the axial direction of the safety condom (1), the protective sleeve (6) is located between the limiting sleeve (7) and the fixed end (31) of the elastic trigger member (3).

8. The retractable blood collection needle according to claim 3, characterized in that: The first portion (61) is provided with a convex rib structure (612) protruding from a side of the condom (1) in the radial direction away from the condom (1).

9. The retractable blood collection needle according to claim 1, characterized in that: It also includes a spring (5) and a venous needle tube (4), one end of the venous needle tube (4) is connected to one end of the venous needle seat (2), and the spring (5) is arranged between the venous needle seat (2) and the condom (1) in the axial direction; when the free end (32) of the elastic trigger member (3) is inserted into the limiting hole (11), the spring (5) is compressed; when the free end (32) of the elastic trigger member (3) enters the condom (1), the spring (5) drives the venous needle seat (2) to move, thereby driving the venous needle seat (2) to enter the condom (1).

10. The retractable blood collection needle according to claim 9, characterized in that: The outer wall of the intravenous needle seat (2) is protrudingly provided with an annular protrusion (21), and the two ends of the spring (5) act on the condom (1) and the annular protrusion (21) respectively. The side wall of the condom (1) is also provided with a through groove (14), and one end of the through groove (14) extends to form an elastic sheet (141), and the inner wall of the condom (1) is protrudingly provided with a positioning protrusion (15); the spring (5) is used to drive the intravenous needle seat (2) to move until the annular protrusion (21) moves to between the elastic sheet (141) and the positioning protrusion (15).

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