Blood taking needle switching device for blood drawing

Abstract

The blood taking needle switching device for blood drawing comprises a switching mechanism, a needle head, a needle cylinder and a hose, the switching mechanism comprises an outer cylinder, a piston column and a handle, the needle cylinder, the hose and the outer cylinder are sequentially connected, the piston column is matched in the outer cylinder in a piston type sliding mode, the needle head is arranged at the end, away from the hose, of the piston column and extends out of the outer cylinder, and the handle is arranged on the needle head. A blood transfusion channel penetrating through the needle head and the hose is formed in the center of the piston column, the handle is connected with the piston column, and a positioning structure used for positioning the piston column is arranged on the outer cylinder. According to the blood taking needle switching device for blood drawing, during blood taking, the length of a needle head of 2.5 cm or 5 cm can be adjusted only by shifting the handle to be positioned in the lower loop or the upper loop, medical staff do not need to waste time to replace the needle head and then connect an injector to conduct blood drawing, blood drawing can be achieved only by simply shifting the handle, and in the time-tight rescue environment, the blood taking needle switching device is convenient to use and high in practicability. The replacement time can be saved, and meanwhile, the risk of secondary pollution cannot be caused.

Description

Technical Field

[0001] The utility model relates to the technical field of blood drawing instruments, in particular to a blood drawing needle switching device. Background Art

[0002] In blood testing, a lancet is a very common medical device, primarily used for blood collection. Commonly used lancets on the market, such as those listed in Chinese Patent Publication No. CN106667504A, include a blood withdrawal needle connected to a blood injection needle via a flexible tube. These lancets typically have a 2.5 cm length.

[0003] However, the existing 2.5cm universal blood gas needle is used clinically in situations such as obesity / rescue (situations where blood drawing is more difficult). Because the needle is short and is directly connected to the syringe vertically, during the femoral artery drawing process, the artery of obese patients is deeper, and medical staff have to waste time replacing the needle and then connecting the syringe to draw blood. This not only wastes time but also wastes consumables and has the risk of re-contamination. Utility Model Content

[0004] (1) Technical problems solved

[0005] In view of the deficiencies in the prior art, the present invention provides a blood collection needle switching device for drawing blood, which solves the problems raised in the above-mentioned background technology.

[0006] (2) Technical solution

[0007] To achieve the above objectives, the present invention is implemented through the following technical solutions: a blood collection needle switching device for blood drawing, including a switching mechanism, a needle, a syringe, and a hose, the switching mechanism including an outer tube, a piston column, and a handle, the syringe, hose, and outer tube are connected in sequence, the piston column is piston-slidingly adapted in the outer tube, the needle is arranged at the end of the piston column away from the hose and extends to the outside of the outer tube, a blood transfusion channel passing through the needle and the hose is provided at the center of the piston column, the handle is connected to the piston column, and a positioning structure for positioning the piston column is provided on the outer tube.

[0008] Preferably, the positioning structure is a C-shaped slideway opened on the outer cylinder, the slideway is composed of a lower ringway, an upper ringway and a straight track vertically connecting the ends of the two, the handle is connected to the piston column through a slider, and the slider is slidably adapted on the slideway.

[0009] Preferably, the circumferential angles of the lower and upper ring roads are greater than 45°.

[0010] Preferably, the lower portion of the piston column is provided with at least one sealing ring in contact with the inner wall of the outer cylinder.

[0011] Preferably, the length of the straight channel is 2.5 cm, and the distance from the sealing ring to the lower ring channel is greater than 2.5 cm.

[0012] Preferably, it further comprises a needle sleeve for being sleeved over the needle head, and the end of the outer tube is provided with a bayonet for the needle sleeve to be sleeved in an interference fit.

[0013] (3) Beneficial effects

[0014] The utility model provides a blood collection needle switching device for blood drawing, which has the following beneficial effects:

[0015] 1. The blood collection needle switching device can adjust the needle length to 2.5cm or 5cm by simply turning the handle to position it in the lower or upper loop during blood collection. Medical staff no longer need to waste time changing the needle and then connecting the syringe to draw blood. It can be achieved by simply turning the handle. In a time-sensitive rescue environment, it can save replacement time and will not cause the risk of secondary contamination. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is the overall axonometric drawing of the utility model;

[0017] Figure 2 This is an external schematic diagram of the switching mechanism of the present invention;

[0018] Figure 3 This is a perspective view of the interior of the outer cylinder of the present invention;

[0019] Figure 4 This is a diagram of the needle adjustment and extension state of the utility model.

[0020] In the figure: 1 switching mechanism, 2 needle, 3 syringe, 4 hose, 5 needle sleeve, 6 bayonet, 11 outer cylinder, 12 piston rod, 13 handle, 14 slide, 15 blood transfusion channel, 16 sealing ring, 141 lower ring, 142 straight channel, 143 upper ring. DETAILED DESCRIPTION

[0021] The present invention provides a blood collection needle switching device for blood drawing. Figure 1-4 As shown, it includes a switching mechanism 1, a needle 2, a syringe 3, and a hose 4. The switching mechanism 1 includes an outer tube 11, a piston rod 12, and a handle 13. The syringe 3, hose 4, and outer tube 11 are connected in sequence. The piston rod 12 is piston-slidably adapted in the outer tube 11. The length of the piston rod 12 should be greater than 2.5 cm. The needle 2 is located at the end of the piston rod 12 away from the hose 4 and extends outside the outer tube 11.

[0022] like Figure 1As shown, a blood transfusion channel 15 passing through the needle 2 and the hose 4 is provided at the center of the piston column 12 , and a handle 13 is connected to the piston column 12 . The handle 13 is used to assist the needle 2 in inserting when drawing blood and to adjust the position of the piston column 12 .

[0023] The outer cylinder 11 is provided with a positioning structure for positioning the piston column 12 .

[0024] like Figure 2-3 As shown, the positioning structure is a C-shaped slide 14 opened on the outer tube 11. The slide 14 consists of a lower ring 141, an upper ring 143 and a straight path 142 vertically connecting the ends of the two. The handle 13 is connected to the piston column 12 through a slider, and the slider slides and fits on the slide 14.

[0025] The circumferential angle of the lower ringway 141 and the upper ringway 143 is greater than 45°. In this embodiment, the circumferential angle of the lower ringway 141 and the upper ringway 143 is 90°.

[0026] The length of the straight path 142 is 2.5 cm. When the slider of the handle 13 is in the lower ring path 141, the length of the needle 2 exposed from the outer tube 11 is 2.5 cm. When the slider of the handle 13 is in the upper ring path 143, the length of the needle 2 exposed from the outer tube 11 is 5 cm.

[0027] Of course, in order not to be limited to the two lengths of 2.5 cm and 5 cm, the number of loops between the lower loop 141 and the upper loop 143 can also be increased so that the needle 2 can be positioned and adjusted at multiple lengths.

[0028] To improve the sealing between the piston rod 12 and the outer tube 11, at least one sealing ring 16 is provided at the lower portion of the piston rod 12 to contact the inner wall of the outer tube 11. As a preferred solution, two rings of sealing rings 16 are provided in this embodiment, and the sealing rings 16 are in close contact with the inner wall of the outer tube 11.

[0029] like Figure 4 As shown, the distance between the sealing ring 16 and the lower annular channel 141 is greater than 2.5 cm. When the slider of the handle 13 is in the upper annular channel 143, the sealing ring 16 is still below the lower annular channel 141 to prevent blood from seeping out from the lower annular channel 141.

[0030] like Figure 1-2 As shown, the device also includes a needle cover 5 for covering the needle 2. The end of the outer tube 11 is provided with a bayonet 6 for the needle cover 5 to be inserted in an interference fit. Before use, the needle 2 is protected by the needle cover 5. When in use, the needle cover 5 can be directly pulled out.

[0031] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A blood collection needle switching device for blood drawing, characterized by: The invention comprises a switching mechanism (1), a needle (2), a syringe (3), and a hose (4); the switching mechanism (1) comprises an outer tube (11), a piston column (12), and a handle (13); the syringe (3), the hose (4), and the outer tube (11) are connected in sequence; the piston column (12) is piston-slidably adapted in the outer tube (11); the needle (2) is arranged at one end of the piston column (12) away from the hose (4) and extends outside the outer tube (11); a blood transfusion channel (15) penetrating the needle (2) and the hose (4) is provided at the center of the piston column (12); the handle (13) is connected to the piston column (12); and a positioning structure for positioning the piston column (12) is provided on the outer tube (11).

2. A blood collection needle switching device according to claim 1, characterized in that: The positioning structure is a C-shaped slideway (14) provided on the outer cylinder (11), the slideway (14) being composed of a lower ringway (141), an upper ringway (143) and a straight path (142) vertically connecting the ends of the lower ringway (141), the handle (13) being connected to the piston column (12) via a slider, and the slider being slidably adapted on the slideway (14).

3. The blood collection needle switching device according to claim 2, characterized in that: The circumferential angles of the lower ringway (141) and the upper ringway (143) are greater than 45°.

4. The blood collection needle switching device according to claim 2, characterized in that: The lower part of the piston column (12) is provided with at least one sealing ring (16) in contact with the inner wall of the outer cylinder (11).

5. The blood collection needle switching device according to claim 4, characterized in that: The length of the straight channel (142) is 2.5 cm, and the distance from the sealing ring (16) to the lower ring channel (141) is greater than 2.5 cm.

6. The blood collection needle switching device according to claim 1, characterized in that: It also includes a needle sleeve (5) for sleeved outside the needle head (2), and the end of the outer tube (11) is provided with a bayonet (6) for the needle sleeve (5) to be sleeved in an interference fit.

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