Vein blood taking needle

Abstract

The utility model discloses a vein blood taking needle which comprises a puncture needle connected with a blood taking bottle, the puncture needle is provided with a connecting pipe, the connecting pipe is connected with a hose, the connecting pipe is provided with an absorption device, the absorption device comprises an adjusting cylinder and an absorption cylinder, the adjusting cylinder is sleeved outside the absorption cylinder and is in threaded connection with the absorption cylinder, and the absorption cylinder is connected with the connecting pipe. The absorption cylinder is connected with the connecting rod, an inner cavity of the absorption cylinder is communicated with an inner hole of the connecting pipe, a sealing block is arranged in the absorption cylinder, the sealing block is connected with the inner cavity of the absorption cylinder in a sealing and sliding mode, a pull rod is arranged on the sealing block, and the pull rod penetrates through the absorption cylinder and is connected with the absorption cylinder in a sliding mode. The pull rod penetrates through the end of the absorption cylinder and is rotationally connected with the adjusting cylinder, blood at the position of a puncture needle head can be sucked into the puncture needle by rotating the adjusting cylinder, and therefore the blood cannot drip from the puncture needle head which is temporarily exposed outside, and pollution is avoided.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of medical apparatus and instruments, more particularly to a venous blood taking needle. BACKGROUND

[0002] Blood examination generally takes the venous blood of patients, uses the venous blood taking needle, and uses the blood taking tube to take the venous blood, and the puncture needle at the other end of the blood taking needle needs to repeatedly puncture the sealing cover of the tube opening of the blood taking tube, and the negative pressure exists in the blood taking tube, so that the venous blood can be sucked into the tube, when a plurality of blood examinations are carried out, different blood taking tubes need to be used, when the puncture needle is pulled out from one blood taking tube, it needs to be quickly inserted into another blood taking tube, otherwise the venous blood in the soft tube of the blood taking needle will drip from the needle head of the puncture needle due to the influence of the negative pressure in the last blood taking tube, causing pollution, therefore the blood taking personnel need to be skilled in tube changing operation, and under the condition that the medical personnel are absent, it is not conducive to the operation of the novice medical personnel who are newly employed, and the skilled medical personnel can also make mistakes and cause blood dripping. SUMMARY

[0003] In view of the defects in the prior art, the utility model provides a venous blood taking needle, which can avoid blood dripping when the needle head of the puncture needle is not exposed outside during the replacement of the blood taking bottle, thereby avoiding pollution.

[0004] To achieve the above object, the utility model provides the following technical scheme: a venous blood taking needle, which comprises a puncture needle connected with a blood taking bottle, a connecting pipe is arranged on the puncture needle, a soft tube is connected with the connecting pipe, an absorption device is arranged on the connecting pipe, the absorption device comprises an adjusting cylinder and an absorption cylinder, the adjusting cylinder is sleeved outside the absorption cylinder and is threadedly connected with the absorption cylinder, the absorption cylinder is connected with a connecting rod, the inner cavity of the absorption cylinder is communicated with the inner hole of the connecting pipe, a sealing block is arranged in the absorption cylinder, the sealing block is sealingly and slidably connected with the inner cavity of the absorption cylinder, a pull rod is arranged on the sealing block, the pull rod passes through the absorption cylinder and is slidably connected with the absorption cylinder, and the end of the pull rod passing through the absorption cylinder is rotationally connected with the adjusting cylinder.

[0005] Further, the pull rod and the adjusting cylinder are rotationally connected in one direction, that is, the sealing block moves in one direction, and the one-way moving direction is the direction in which the sealing block moves away from the connecting pipe.

[0006] Further, a connecting plate is arranged on the end of the pull rod passing through the absorption cylinder, a connecting cavity corresponding to the connecting plate is arranged on the adjusting cylinder, a first annular ratchet is arranged on the side of the connecting plate away from the pull rod, a ratchet plate is slidably connected in the connecting cavity, a second annular ratchet is arranged on the side of the ratchet plate facing the first annular ratchet, the first annular ratchet and the second annular ratchet are matched with each other, and a compression spring is arranged between the ratchet plate and the connecting cavity.

[0007] Further, the pull rod is provided with a one-way bearing between the end of the absorption cylinder and the adjusting cylinder.

[0008] Further, the pull rod is provided with a one-way bearing between the end of the absorption cylinder and the adjusting cylinder.

[0009] Compared with the prior art, the beneficial effects of the utility model are that: the first blood sampling is completed, and the adjusting cylinder is rotated outside at the moment when the puncture needle is pulled out of the blood collection bottle or in the pulling-out process, so that the adjusting cylinder is away from the connecting pipe, the pull rod and the sealing block are driven, and the sealing block is moved away from the inner hole of the connecting pipe, the blood in the connecting pipe is sucked into the absorption cylinder in the moving process, the blood at the needle head of the puncture needle is sucked into the inside of the puncture needle, so that the needle head of the puncture needle which is exposed outside temporarily does not drip blood, and pollution is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0010] Figure 1 It is a structure schematic view of the utility model venous blood sampling needle;

[0011] Figure 2 It is Figure 1 It is a sectional view in A-A direction;

[0012] Figure 3 It is Figure 1 It is a sectional view in B-B direction;

[0013] Figure 4 It is Figure 1 It is a close-up view of C part.

[0014] Puncturing needle 1, connecting pipe 2, hose 3, adjusting cylinder 4, absorption cylinder 5, inner cavity 6, inner hole 7, sealing block 8, pull rod 9, connecting plate 10, connecting cavity 11, first annular ratchet 12, ratchet plate 13, second annular ratchet 14, compression spring 15, limiting convex strip 16. DETAILED DESCRIPTION

[0015] In the description of the utility model, it needs to be explained that for the orientation words, if the terms "center", "transverse (X)", "longitudinal (Y)", "vertical (Z)", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like indicate the orientation and positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and cannot be understood as limiting the specific protection scope of the utility model.

[0016] Furthermore, 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 number of technical features. Therefore, the terms "first" and "second" may explicitly or implicitly refer to one or more of these features. In the description of this utility model, "several" and "a number" mean two or more, unless otherwise specifically defined.

[0017] Reference Figures 1 to 4 The utility model is further described.

[0018] A venous blood collection needle includes a puncture needle 1 connected to a blood collection bottle, a connecting tube 2 is provided on the puncture needle 1, a hose 3 is connected to the connecting tube 2, an absorption device is provided on the connecting tube 2, and the absorption device includes an adjusting cylinder 4 and an absorption cylinder 5, the adjusting cylinder 4 is sleeved on the outside of the absorption cylinder 5 and is threadedly connected to the absorption cylinder 5, the absorption cylinder 5 is connected to the connecting rod, the inner cavity 6 of the absorption cylinder 5 is connected to the inner hole 7 of the connecting tube 2, a sealing block 8 is provided in the absorption cylinder 5, the sealing block 8 is sealingly and slidingly connected to the inner cavity 6 of the absorption cylinder 5, a pull rod 9 is provided on the sealing block 8, the pull rod 9 passes through the absorption cylinder 5 and is slidably connected to the absorption cylinder 5, and the pull rod 9 passes through the end of the absorption cylinder 5 and is rotatably connected to the adjusting cylinder 4.

[0019] like Figures 1 to 4 As shown, after the puncture needle 1 is inserted into the blood collection bottle, the negative pressure in the blood collection bottle causes venous blood to enter the blood collection bottle through the hose 3, the connecting tube 2 and the puncture needle 1. This is the first blood collection, and the initial position of the sealing block 8 in the absorption cylinder 5 is close to the inner hole 7 of the connecting tube 2. When the first blood collection volume reaches the requirement, the puncture needle 1 is pulled out, and the external adjustment cylinder 4 is rotated at the moment of pulling out or during the pulling out process to keep it away from the connecting tube 2, which can drive the pull rod 9 and the sealing block 8, and move the sealing block 8 away from the inner hole 7 of the connecting tube 2. During the movement, the blood in the connecting tube 2 is sucked into the absorption cylinder 5, so that the blood at the needle tip of the puncture needle 1 is sucked into the inside of the puncture needle 1, so that the needle tip of the puncture needle 1 that is briefly exposed to the outside will not drip blood, thereby avoiding contamination.

[0020] In this embodiment, it is preferred that the pull rod 9 is connected to the adjusting cylinder 4 in a one-way rotation, that is, the sealing block 8 moves in one direction, and the one-way movement direction is the direction in which the sealing block 8 moves away from the connecting tube 2. That is, when blood is drawn multiple times, the reverse rotation of the adjusting cylinder 4 (that is, the rotation toward the connecting tube 2) is avoided to discharge the blood in the absorption cylinder 5 back into the blood collection tube.

[0021] like Figure 3 and Figure 4As shown, one preferred way of the one-way rotation connection between the pull rod 9 and the adjusting cylinder 4 is that the pull rod 9 passes through the end of the absorption cylinder 5 and is provided with a connecting plate 10, the adjusting cylinder 4 is provided with a connecting cavity 11 corresponding to the connecting plate 10, the side of the connecting plate 10 away from the pull rod 9 is provided with a first annular ratchet 12, the connecting cavity 11 is slidably connected with a ratchet plate 13, the side of the ratchet plate 13 facing the first annular ratchet 12 is provided with a second annular ratchet 14, the first annular ratchet 12 and the second annular ratchet 14 are matched with each other, and the ratchet plate 13 is provided with a compression spring 15 between the ratchet plate 13 and the connecting cavity 11.

[0022] Specifically, the second annular ratchet 14 on the ratchet plate 13 is tightly matched with the first annular ratchet 12 through the compression spring 15, when the adjusting cylinder 4 rotates upward (i.e. the adjusting cylinder 4 rotates away from the connecting pipe 2), the second annular ratchet 14 and the first annular ratchet 12 can rotate, the ratchet and the ratchet repeatedly dislocate and re-match, realizing that the pull rod 9 rotates and drives the pull rod 9 to move upward at the same time, when the adjusting cylinder 4 reversely rotates, the second annular ratchet 14 and the first annular ratchet 12 cannot reversely rotate, the ratchet and the ratchet are locked with each other, so that the adjusting cylinder 4 and the pull rod 9 cannot rotate with each other, i.e. the reverse movement of the pull rod 9 can be avoided, so that the sealing block 8 pushes the blood in the absorption cylinder 5 into the connecting pipe 2 again.

[0023] Specifically, the cross section of a single ratchet of the second annular ratchet 14 and the first annular ratchet 12 is triangular, and the direction is as shown in Figure 4 As shown, the thread between the adjusting cylinder 4 and the absorption cylinder 5 is right-handed thread, i.e. when the adjusting cylinder 4 rotates clockwise, the second annular ratchet 14 and the first annular ratchet 12 will be locked with each other.

[0024] Specifically, the side of the ratchet plate 13 and the connecting cavity 11 can be slidably connected through the spline or the limiting clamping groove and the limiting clamping strip, so that the ratchet plate 13 slides and does not relatively rotate with the adjusting cylinder 4.

[0025] Another preferred way of the one-way rotation connection between the pull rod 9 and the adjusting cylinder 4 is that the pull rod 9 passes through the end of the absorption cylinder 5 and is provided with a one-way bearing between the pull rod 9 and the adjusting cylinder 4, the one-way rotation principle of the one-way bearing is similar to the ratchet unlocking and locking, which is prior art and will not be described herein.

[0026] As shown in Figure 1 and Figure 2 In the embodiment, preferably, the outer circular side of the pull rod 9 is provided with a limiting convex strip 16, the limiting convex strip 16 extends along the axis direction of the pull rod 9, the absorption cylinder 5 is provided with a limiting groove corresponding to the limiting convex strip 16, the limiting convex strip 16 and the limiting groove are matched, realizing the sliding connection between the pull rod 9 and the absorption cylinder 5, and preventing the pull rod 9 and the absorption cylinder 5 from rotating.

[0027] The above merely describes preferred embodiments of the present application, and the protection scope of the present application is not limited to the above-mentioned embodiments. Any technical solution falling within the concept of the present application shall fall within the protection scope of the present application. It should be noted that, for ordinary skilled persons in the art, some improvements and refinements without departing from the principles of the present application shall also be considered as falling within the protection scope of the present application.

Claims

1. A venous blood collection needle, characterized by: It includes a puncture needle connected to a blood collection bottle, a connecting tube is provided on the puncture needle, a hose is connected to the connecting tube, an absorption device is provided on the connecting tube, the absorption device includes an adjusting tube and an absorption tube, the adjusting tube is sleeved outside the absorption tube and is threadedly connected to the absorption tube, the absorption tube is connected to the connecting rod, the inner cavity of the absorption tube is connected to the inner hole of the connecting tube, a sealing block is provided in the absorption tube, the sealing block is sealingly and slidingly connected to the inner cavity of the absorption tube, a pull rod is provided on the sealing block, the pull rod passes through the absorption tube and is slidably connected to the absorption tube, the pull rod passes through the end of the absorption tube and is rotatably connected to the adjusting tube.

2. The venous blood collection needle according to claim 1, characterized in that: The pull rod is connected to the adjusting cylinder in a one-way rotation, that is, the sealing block moves in one direction, and the one-way movement direction is the direction in which the sealing block moves away from the connecting pipe.

3. The venous blood collection needle according to claim 2, characterized in that: A connecting plate is provided on the end of the pull rod passing through the absorption cylinder, and a connecting cavity corresponding to the connecting plate is provided on the adjusting cylinder. A first annular ratchet is provided on the side of the connecting plate away from the pull rod, and a ratchet plate is slidingly connected in the connecting cavity. A second annular ratchet is provided on the side of the ratchet plate facing the first annular ratchet, the first annular ratchet and the second annular ratchet cooperate with each other, and a compression spring is provided between the ratchet plate and the connecting cavity.

4. The venous blood collection needle according to claim 2, characterized in that: A one-way bearing is provided between the end of the pull rod passing through the absorption cylinder and the adjustment cylinder.

5. The venous blood collection needle according to claim 1, characterized in that: A limiting convex strip is provided on the outer circular side surface of the pull rod, and the limiting convex strip extends along the axis direction of the pull rod. A limiting groove corresponding to the limiting convex strip is provided on the absorption cylinder, and the limiting convex strip cooperates with the limiting groove.

Images