Retractable blood taking needle
By introducing a cover member into the retractable blood collection needle, the problem of difficult to trigger elastic inversion is solved, and a safer and more convenient operation is achieved.
Patent Information
- Application Number
- CN202421670350.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-15
- Publication Date
- 2025-08-12
- Estimated Expiration
- 2034-07-15
AI Technical Summary
In the existing retractable blood collection needle, the elastically inverted free end is easily exposed when not in use, making it difficult for medical staff to trigger it and there is a risk of false triggering.
The cover is introduced into the retracted blood collection needle to block the free end of the elastic inverted button, and the elastic inverted button is triggered to enter the protective cover by pressing the deformation of the cover, simplifying operation and reducing false triggering.
It makes it easier for medical staff to trigger elastic inversions, reduce the risk of false triggering, and improve operational safety and convenience.
Smart Images
Figure CN223208417U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of blood collection needles, in particular to a retractable blood collection needle. Background Art
[0002] A retractable lancet is a medical device commonly used to collect blood samples. Its characteristic is that the lancet automatically retracts after blood is drawn, preventing subsequent harm to patients and medical staff, and effectively reducing the risk of cross-infection. Specifically, the retractable blood collection needle usually includes a blood collection needle, a protective sleeve, a blood collection needle seat, an elastic buckle and a spring, etc. One end of the blood collection needle is connected to the blood collection needle seat, the protective sleeve is arranged on the blood collection needle seat, and a spring is arranged axially between the two, the side wall of the protective sleeve is provided with a snap-on window, and the fixed end of the elastic buckle is connected to the blood collection needle seat; before the retractable blood collection needle is used, the free end of the elastic buckle extends out of the protective sleeve so that the elastic buckle is snapped into the snap-on window, and the spring is compressed at this time. After the retractable blood collection needle is used for blood collection, the snap-on relationship between the elastic buckle and the snap-on window can be released by pressing the free end of the elastic buckle to enter the protective sleeve from the snap-on window (this action can be called triggering the elastic buckle), thereby realizing the spring-driven movement of the blood collection needle seat, and then driving the blood collection needle to retract into the protective sleeve. However, for this existing retractable blood collection needle, when not in use, the free end of the elastic inverted buckle is stuck in the snap-in window, that is, the free end of the elastic inverted buckle is exposed at the snap-in window; but in the radial direction of the protective sleeve, in some existing retractable blood collection needles, the free end of the elastic inverted buckle does not radially extend far out of the protective sleeve, that is, the free end of the elastic inverted buckle is not exposed far in the radial direction of the protective sleeve, resulting in the elastic inverted buckle not being easily triggered by medical staff. Utility Model Content
[0003] The utility model aims to solve the problem that the elastic buckle of the existing retractable blood collection needle is difficult to trigger.
[0004] In order to solve the above problems, the utility model provides a retractable blood collection needle, comprising a protective sleeve, a blood collection needle seat and an elastic inverted buckle, the protective sleeve being arranged on the blood collection needle seat, a snap-on window being provided on the protective sleeve, the fixed end of the elastic inverted buckle being connected to the blood collection needle seat, the free end of the elastic inverted buckle being used to extend out of the snap-on window and to make the elastic inverted buckle snap into the snap-on window, the retractable blood collection needle also including a shielding member, the shielding member being located outside the protective sleeve and connected to the protective sleeve, the shielding member shielding the free end of the elastic inverted buckle that is snapped into the snap-on window, the shielding member being used to deform toward the snap-on window to drive the free end of the elastic inverted buckle to deform and enter the protective sleeve.
[0005] Similar to the prior art, when the retractable blood collection needle is not in use, the free end of the elastic inverted buckle extends out of the snap-fit window and the elastic inverted buckle is snap-fitted at the snap-fit window. At this time, the blood collection needle tube connected to the blood collection needle seat is in a state of extending out of the protective sleeve; different from the prior art is that the retractable blood collection needle also includes a shielding member, which is arranged on the outside of the protective sleeve and connected to the protective sleeve, and the free end of the elastic inverted buckle snapped into the snap-fit window is shielded by the shielding member, that is, at least part of the shielding member is located on the side of the free end of the elastic inverted buckle away from the blood collection needle seat; in this way, when When it is necessary to operate to trigger the elastic inverted buckle, even if the free end of the elastic inverted buckle is not exposed much in the radial direction of the protective cover, the shielding piece can be pressed to deform toward the snap-on window, and then the deformed shielding piece can drive the free end of the elastic inverted buckle to deform into the protective cover to complete the triggering of the elastic inverted buckle. Compared with the existing technology, the setting of the shielding piece of the utility model is equivalent to extending the free end of the elastic inverted buckle "further toward the outside of the protective cover", and then triggering the elastic inverted buckle by deforming the shielding piece. This method can make it easier for medical staff to operate and trigger the elastic inverted buckle that is not exposed much.
[0006] Furthermore, the side of the snap-fit window includes a first side and a second side arranged opposite to each other, the elastic undercut is provided with a slot between a free end and a fixed end, the slot is used to snap into the second side, and the fixed end of the elastic undercut is located on a side of the second side away from the first side;
[0007] The shielding member is a shielding arm, the first end of the shielding arm is connected to the protective cover, and the first end of the shielding arm is located on the side of the first side away from the second side, and the second end of the shielding arm extends toward the second side to shield the free end of the elastic buckle.
[0008] Furthermore, the length of the shielding arm is smaller than the length of the elastic undercut, and / or the rigidity of the shielding arm is greater than the length of the elastic undercut.
[0009] Furthermore, the shielding arm includes an integrally formed arm base and an arm rod, the arm base is connected to the protective cover, the arm rod is connected to one end of the arm base away from the protective cover, and the angle between the arm rod and the arm base is 90°, and the arm rod is used to deform relative to the arm base.
[0010] Furthermore, an arm protrusion is provided on one end of the arm rod away from the arm seat and protrudes toward the clamping window, and the arm protrusion is used to abut between the free end and the fixed end of the elastic undercut.
[0011] Furthermore, the shielding arm and the protective cover are an integrally formed structure.
[0012] Furthermore, it also includes a protective sleeve, which is mounted on the protective sleeve and covers the shielding member and the clamping window.
[0013] Furthermore, one end of the protective sleeve extends out of the end portion of the protective sleeve in the axial direction of the protective sleeve.
[0014] Furthermore, it also includes two wings, which are connected by an intermediate sleeve, and the intermediate sleeve is fixedly mounted on the protective sleeve, and the protective sleeve is mounted on the intermediate sleeve, and the inner wall of the protective sleeve is fitted with the outer wall of the intermediate sleeve, and a guide groove extending axially along the protective sleeve is provided on one side of the intermediate sleeve, and the protective sleeve is provided with a guide protrusion that cooperates with the guide groove.
[0015] Furthermore, a hollow protrusion is provided at a position of the protective sleeve corresponding to the shielding member and protruding toward the outside, and the shielding member is located in the hollow protrusion. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 This is a schematic diagram of the partial structure of the retractable blood collection needle of the embodiment of the utility model Figure 1 ;
[0017] Figure 2 for Figure 1 A vertical cross-sectional structural diagram of ;
[0018] Figure 3 This is a schematic diagram of the partial structure of the retractable blood collection needle of the embodiment of the utility model Figure 2 ;
[0019] Figure 4 for Figure 3 Schematic diagram of the structure after the middle protective cover is removed from the protective cover;
[0020] Figure 5 for Figure 3 Schematic diagram of the vertical cross-section structure.
[0021] Description of reference numerals:
[0022] 1. Protective cover; 11. Snap-on window; 2. Blood collection needle seat; 3. Elastic undercut; 31. Fixed end; 32. Free end; 33. Card slot; 4. Shielding piece; 41. Arm seat; 42. Arm rod; 421. Arm protrusion; 5. Protective cover; 51. Guide protrusion; 52. Hollow protrusion; 53. Extension plate; 6. Wing; 7. Intermediate cover; 71. Guide groove; 8. Blood collection needle; 9. Needle sheath. DETAILED DESCRIPTION
[0023] To make the above-mentioned objects, features, and advantages of the present invention more clearly understood, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings. Although certain embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be construed as being limited to the embodiments described herein. Instead, these embodiments are provided to provide a more thorough and complete understanding of the present invention. It should be understood that the drawings and embodiments of the present invention are for illustrative purposes only and are not intended to limit the scope of protection of the present invention.
[0024] The X-axis in the accompanying drawings represents the horizontal direction and is designated as the front-to-back position, with the positive direction of the X-axis representing the front side and the negative direction of the X-axis representing the back side. The Y-axis in the accompanying drawings represents the left-to-right position, with the positive direction of the Y-axis representing the left side and the negative direction of the Y-axis representing the right side. It should also be noted that the aforementioned Y-axis and X-axis are merely for the purpose of facilitating the description of the present invention and simplifying the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention.
[0025] The term "including" and its variations used in this document are open inclusions, 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 other embodiment"; the term "some embodiments" means "at least some embodiments"; the term "optionally" means "optional embodiments". The relevant definitions of other terms will be given in the following description. It should be noted that the concepts of "first", "second", etc. mentioned in this utility model are only used to distinguish different devices, modules or units, and are not used to limit the order or interdependence of the functions performed by these devices, modules or units.
[0026] It should be noted that the modifications of "one" and "plurality" mentioned in this utility model are illustrative and non-restrictive. Those skilled in the art will understand that unless the context clearly indicates otherwise, they should be understood as "one or more." Unless the context clearly indicates otherwise, the "connection" mentioned in this utility model should be understood as either a direct connection or an indirect connection.
[0027] See also Figure 1-2, a retractable blood collection needle according to an embodiment of the present invention comprises a protective sleeve 1, a blood collection needle seat 2 and an elastic inverted buckle 3, wherein the protective sleeve 1 is sleeved on the blood collection needle seat 2, and a snapping window 11 is provided on the protective sleeve 1, and the fixed end 31 of the elastic inverted buckle 3 is connected to the blood collection needle seat 2, and the free end 32 of the elastic inverted buckle 3 is used to extend out of the snapping window 11 and make the elastic inverted buckle 3 snap into the snapping window 11. The retractable blood collection needle also includes a shielding member 4, which is located outside the protective sleeve 1 and connected to the protective sleeve 1, and the shielding member 4 shields the free end 32 of the elastic inverted buckle 3 that is snapped into the snapping window 11, and the shielding member 4 is used to deform toward the snapping window 11 to drive the free end 32 of the elastic inverted buckle 3 to deform and enter the protective sleeve 1.
[0028] The same as the prior art is that, when the retractable blood collection needle is not in use, the free end 32 of the elastic undercut 3 extends out of the snap-fit window 11 and the elastic undercut 3 is snapped into the snap-fit window 11. At this time, the blood collection needle tube connected to the blood collection needle seat 2 is in a state of extending out of the protective sleeve 1; the difference from the prior art is that the retractable blood collection needle also includes a shielding member 4, which is arranged on the outside of the protective sleeve 1 and connected to the protective sleeve 1, and the free end 32 of the elastic undercut 3 snapped into the snap-fit window 11 is shielded by the shielding member 4, that is, at least a part of the shielding member 4 is located on the side of the free end 32 of the elastic undercut 3 away from the blood collection needle seat 2; in this way, When it is necessary to operate and trigger the elastic inverted buckle 3, even if the free end 32 of the elastic inverted buckle 3 is not exposed much in the radial direction of the protective cover 1, the shielding member 4 can be pressed to deform toward the snap-on window 11, and then the deformed shielding member 4 can drive the free end 32 of the elastic inverted buckle 3 to deform into the protective cover 1 to complete the triggering of the elastic inverted buckle 3. Compared with the prior art, the setting of the shielding member 4 of the utility model is equivalent to extending the free end 32 of the elastic inverted buckle 3 "further toward the outside of the protective cover 1", and then triggering the elastic inverted buckle 3 by deforming the shielding member 4. This method can make it easier for medical staff to operate and trigger the elastic inverted buckle 3 that is not exposed much.
[0029] Alternatively, see Figure 1-2 The retractable blood collection needle further includes a needle sheath 9. When the retractable blood collection needle is not in use, since the blood collection needle 8 is extended from the protective sheath 1, the needle sheath 9 can be put on the blood collection needle 8 to protect the blood collection needle 8 from contamination. When blood collection is required, the medical staff can remove the needle sheath 9 and insert the blood collection needle 8 into the patient's skin.
[0030] See also Figure 1-2Optionally, the side of the snap-in window 11 includes a first side and a second side arranged opposite to each other, and a slot 33 is provided between the free end 32 and the fixed end 31 of the elastic buckle 3, and the slot 33 is used to snap into the second side, and the fixed end 31 of the elastic buckle 3 is located on the side of the second side away from the first side.
[0031] Here, the first side of the snap-in window 11 specifically refers to the front side of the snap-in window 11, and the first side of the snap-in window 11 specifically refers to the rear side of the snap-in window 11. When the retractable blood collection needle is not in use, after the free end 32 of the elastic buckle 3 extends out of the snap-in window 11, the slot 33 of the elastic buckle 3 can be snap-fitted with the rear side of the snap-in window 11, and the fixed end 31 of the elastic buckle 3 connected to the blood collection needle seat 2 is located behind the rear side of the snap-in window 11.
[0032] In some retractable blood collection needles of the prior art, as mentioned above, if the free end 32 of the elastic undercut 3 does not extend far out of the protective sleeve 1 in the radial direction, it may be difficult for medical staff to trigger the elastic undercut.
[0033] In addition, there may be another problem in some other retractable blood collection needles in the prior art, that is, if the free end 32 of the elastic inverted buckle 3 extends radially out of the protective sleeve 1 for a long time, then during the process of transfer and transportation, the elastic inverted buckle 3 may be easily triggered by mistake, causing the blood collection needle tube to retract into the protective sleeve 1, and the medical staff may also accidentally trigger the elastic inverted buckle 3 when holding the retaining sleeve, causing the blood collection needle tube to retract into the protective sleeve 1, both of which may cause the retractable blood collection needle to be scrapped due to accidental triggering before it is used; moreover, if the medical staff accidentally triggers the elastic inverted buckle 3, it may easily cause accidents to the medical staff themselves or the patient.
[0034] In response to the above-mentioned issues, in the retractable blood collection needle of the present invention, like the elastic undercut 3, the shielding member 4 is also an arm-shaped structure as a whole. The shielding member 4 is a shielding arm, the first end of which is connected to the protective sleeve 1 and is located on the side of the first side away from the second side, while the second end of the shielding arm extends toward the second side to shield the free end 32 of the elastic undercut 3. It should be noted that the free end 32 and the fixed end 31 of the elastic undercut 3 refer to the two end surfaces of the elastic undercut 3 in the direction of its arm length, respectively, and the distance from the free end 32 to the fixed end 31 is the arm length of the elastic undercut 3.
[0035] In this embodiment, the first end of the shielding arm is fixed to the side of the first side of the clamping window 11 away from the second side, that is, the first end of the shielding arm is fixed in front of the clamping window 11, and the second end of the shielding arm extends backward to shield the free end 32 of the elastic undercut 3. Figure 2As shown, in order to trigger the elastic inverted buckle 3, the medical staff needs to first apply a pressing force to the rear end of the shielding arm to deform downward (this force is recorded as the first pressing force). The first pressing force will eventually act between the two ends of the arm length of the elastic inverted buckle 3 to allow the elastic inverted buckle 3 to enter the protective cover 1. Since the first pressing force eventually acts between the two ends of the arm length of the elastic inverted buckle 3 after passing through the shielding arm, compared with the second pressing force required to directly press on the free end 32 of the elastic inverted buckle 3 in the prior art, the first pressing force needs to be greater than the second pressing force. In this way, the elastic inverted buckle 3 can be avoided from being triggered by mistake to a certain extent.
[0036] See also Figure 1-2 Optionally, the length of the shielding arm is smaller than the length of the elastic undercut 3 , and / or the rigidity of the shielding arm is greater than the length of the elastic undercut 3 .
[0037] In this embodiment, the shielding arm is shorter than the elastic undercut 3. Thus, under the condition that the shielding arm and the elastic undercut 3 have the same rigidity, the shielding arm is more difficult to deform than the elastic undercut 3, thereby further preventing the elastic undercut 3 from being accidentally triggered. In this embodiment, the rigidity of the shielding arm can also be designed to be greater than that of the elastic undercut 3, thereby further ensuring that the shielding arm is not easily deformed, thereby further preventing the elastic undercut 3 from being accidentally triggered.
[0038] See also Figure 1-2 Optionally, the shielding arm includes an integrally formed arm base 41 and an arm rod 42, the arm base 41 is connected to the protective cover 1, the arm rod 42 is connected to the end of the arm base 41 away from the protective cover 1, and the angle between the arm rod 42 and the arm base 41 is 90°, and the arm rod 42 is used to deform relative to the arm base 41.
[0039] In this embodiment, the shielding arm is connected to the protective cover 1 through the arm base 41, and the arm rod 42 of the shielding arm and the arm base 41 are an integrally formed structure. In this way, the deformation of the shielding arm specifically refers to the deformation of the arm rod 42 relative to the arm base 41. Figure 2 As shown, in the natural state, the elastic undercut 3 is set at an acute angle compared to the arm length direction of the elastic undercut 3 and the blood collection needle seat 2. Since the arm rod 42 is set perpendicular to the arm seat 41 in the natural state (the angle between the arm rod 42 and the arm seat 41 is 90°), the arm rod 42 is less likely to be deformed, further preventing the arm rod 42 from being accidentally deformed and causing the elastic undercut 3 to be triggered by mistake.
[0040] See also Figure 1-2 Optionally, an arm protrusion 421 is provided at one end of the arm rod 42 away from the arm seat 41 and protrudes toward the clamping window 11, and the arm protrusion 421 is used to abut between the free end 32 and the fixed end 31 of the elastic undercut 3.
[0041] In this embodiment, when the shielding arm and the elastic undercut 3 are in their natural state, the rear end of the arm rod 42 is provided with an arm protrusion 421 facing downward, and the arm protrusion 421 abuts between the free end 32 and the fixed end 31 of the elastic undercut 3. In this way, the arm protrusion 421 always serves as a force transmission structure for transmitting the force applied to the arm rod 42 to the elastic undercut 3. When the elastic undercut 3 needs to be triggered, the medical staff first applies a pressing force (this force is recorded as a first pressing force) to the rear end of the arm rod 42 to deform downward. The first pressing force then acts between the two ends of the arm length of the elastic undercut 3 through the arm protrusion 421. Because the first pressing force can only act between the two ends of the arm length of the elastic undercut 3 after passing through the arm protrusion 421 at the rear end of the arm rod 42, the first pressing force needs to be greater than the second pressing force required for directly pressing on the free end 32 of the elastic undercut 3 in the prior art. In this way, the elastic undercut 3 can be prevented from being accidentally triggered to a certain extent.
[0042] Optionally, the shielding arm and the protective cover 1 are integrally formed. That is, the arm base 41 of the shielding arm and the protective cover 1 are integrally formed, and the shielding arm is equivalent to an arm structure formed by extending the protective cover 1. No additional connection structure is required between the shielding arm and the protective cover 1.
[0043] See also Figure 3-5 Optionally, the retractable blood collection needle further includes a protective sleeve 5 , which is sleeved on the protective sleeve 1 , and covers the shielding member 4 and the snap-in window 11 .
[0044] In this embodiment, the aforementioned shielding member 4 is mainly used to trigger the elastic buckle 3 for the convenience of operation by medical personnel and to prevent medical personnel from accidentally triggering the elastic buckle 3; and when the unused retractable blood collection needle is transported or transferred, the protective cover 5 mainly serves to prevent the shielding member 4 from being deformed and triggering the elastic buckle 3 due to bumps and other reasons.
[0045] See also Figure 3-5 Optionally, one end of the protective sleeve 5 extends out of the end of the protective sleeve 1 in the axial direction of the protective sleeve 1.
[0046] In this embodiment, the front end of the protective sleeve 5 extends out of the front end of the protective sleeve 1, so that the protective sleeve 5 can not only cover the shielding member 4, but also cover the needle shield 9. When the retractable blood collection needle needs to be used, the protective sleeve 5 is first pulled out, and then the needle shield 9 is pulled out.
[0047] See also Figure 3-5Optionally, it further includes two wings 6, which are connected by an intermediate sleeve 7, and the intermediate sleeve 7 is fixedly sleeved on the protective sleeve 1, the protective sleeve 5 is sleeved on the intermediate sleeve 7, and the inner wall of the protective sleeve 5 is in contact with the outer wall of the intermediate sleeve 7, and a guide groove 71 extending axially along the protective sleeve 1 is provided on one side of the intermediate sleeve 7, and the protective sleeve 5 is provided with a guide protrusion 51 that cooperates with the guide groove 71.
[0048] In this embodiment, the two wings 6 are located at the front end of the protective sleeve 1 and primarily serve to prevent slipping. Medical personnel can pinch the two wings 6 during use to perform puncture and blood collection. Furthermore, the protective sleeve 5 is sheathed over the intermediate sleeve 7 to achieve sheathing on the protective sleeve 1. The inner wall of the protective sleeve 5 fits in contact with the outer wall of the intermediate sleeve 7. In the radial direction of the protective sleeve 5, a gap can be provided between the protective sleeve 5 and the shielding member 4. This prevents the shielding member 4 from being accidentally deformed when the protective sleeve 5 is inserted or removed. Furthermore, even if the protective sleeve 5 is deformed by an external object, the shielding member 4 is protected from deformation.
[0049] In this embodiment, a notch may be provided on the lower side of the rear end of the protective sleeve 5, and an extension plate 53 may be provided on the front end of the notch of the protective sleeve 5, and the guide protrusion 51 is provided on the upper side of the extension plate 53. When installing the protective sleeve 5, the protective sleeve 5 is inserted into the protective sleeve 1 from front to back, and the extension plate 53 is inserted into the lower side of the intermediate sleeve 7 and the wing 6, and the guide protrusion 51 moves along the guide groove 71 on the lower side of the intermediate sleeve 7 until the protective sleeve 5 covers the shielding member 4 and the snap-on window 11.
[0050] See also Figure 3-5 Optionally, a hollow protrusion 52 is provided at a position of the protective sleeve 5 corresponding to the shielding member 4 and protruding toward the outside, and the shielding member 4 is located in the hollow protrusion 52 .
[0051] In this embodiment, a hollow protrusion 52 is protruding from the upper side of the rear end of the protective sleeve 5. In this way, the shielding member 4 can be placed in the hollow protrusion 52, ensuring that the outer diameter of the part of the protective sleeve 5 not provided with the hollow protrusion 52 does not need to be too large, thereby improving the integration.
[0052] 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 technical features indicated. Thus, features defined as "first" and "second" may explicitly or implicitly include at least one of the features.
[0053] Although the present invention is disclosed as above, the protection scope of the present invention is not limited thereto. Those skilled in the art may make various changes and modifications without departing from the spirit and scope of the present invention, and these changes and modifications will fall within the protection scope of the present invention.
Claims
1. A retractable blood collection needle, comprising a protective sleeve (1), a blood collection needle seat (2) and an elastic undercut (3), wherein the protective sleeve (1) is sleeved on the blood collection needle seat (2), a snap-fit window (11) is provided on the protective sleeve (1), a fixed end (31) of the elastic undercut (3) is connected to the blood collection needle seat (2), and a free end (32) of the elastic undercut (3) is used to extend out of the snap-fit window (11) and enable the elastic undercut (3) to snap-fit at the snap-fit window (11), characterized in that: The retractable blood collection needle further comprises a shielding member (4), the shielding member (4) being located outside the protective sleeve (1) and connected to the protective sleeve (1), the shielding member (4) shielding the free end (32) of the elastic undercut (3) which is inserted into the snap-fit window (11), and the shielding member (4) being used to deform toward the snap-fit window (11) so as to drive the free end (32) of the elastic undercut (3) to deform and enter the protective sleeve (1).
2. The retractable blood collection needle according to claim 1, characterized in that: The side of the snap-fit window (11) comprises a first side and a second side arranged opposite to each other, the elastic undercut (3) is provided with a snap-fit groove (33) between a free end (32) and a fixed end (31), the snap-fit groove (33) is used for snapping onto the second side, and the fixed end (31) of the elastic undercut (3) is located on a side of the second side away from the first side; The shielding member (4) is a shielding arm, the first end of which is connected to the protective cover (1), and the first end of which is located on a side of the first side away from the second side, and the second end of which extends toward the second side to shield the free end (32) of the elastic undercut (3).
3. The retractable blood collection needle according to claim 2, characterized in that: The length of the shielding arm is smaller than the length of the elastic undercut (3), and / or the rigidity of the shielding arm is greater than the length of the elastic undercut (3).
4. The retractable blood collection needle according to claim 2, characterized in that: The shielding arm comprises an integrally formed arm seat (41) and an arm rod (42); the arm seat (41) is connected to the protective cover (1); the arm rod (42) is connected to an end of the arm seat (41) away from the protective cover (1); the angle between the arm rod (42) and the arm seat (41) is 90°; and the arm rod (42) is used to deform relative to the arm seat (41).
5. The retractable blood collection needle according to claim 4, characterized in that: An arm protrusion (421) is provided at one end of the arm rod (42) away from the arm seat (41) and protrudes in the direction of the clamping window (11). The arm protrusion (421) is used to abut between the free end (32) and the fixed end (31) of the elastic undercut (3).
6. The retractable blood collection needle according to claim 2, characterized in that: The shielding arm and the protective cover (1) are an integrally formed structure.
7. The retractable blood collection needle according to claim 1, characterized in that: It also includes a protective sleeve (5), which is sleeved on the protective sleeve (1), and the protective sleeve (5) covers the shielding member (4) and the snap-on window (11).
8. The retractable blood collection needle according to claim 7, characterized in that: One end of the protective sleeve (5) extends out of the end portion of the protective sleeve (1) in the axial direction of the protective sleeve (1).
9. The retractable blood collection needle according to claim 7, characterized in that: The protective sleeve (5) is provided with two fins (6), the two fins (6) are connected by an intermediate sleeve (7), and the intermediate sleeve (7) is fixedly sleeved on the protective sleeve (1), the protective sleeve (5) is sleeved on the intermediate sleeve (7), and the inner wall of the protective sleeve (5) is in contact with the outer wall of the intermediate sleeve (7), one side of the intermediate sleeve (7) is provided with a guide groove (71) extending along the axial direction of the protective sleeve (1), and the protective sleeve (5) is provided with a guide protrusion (51) that cooperates with the guide groove (71).
10. The retractable blood collection needle according to claim 7, characterized in that: A hollow protrusion (52) is provided at a position of the protective sleeve (5) corresponding to the shielding member (4) and protruding toward the outside, and the shielding member (4) is located inside the hollow protrusion (52).