Backflow prevention blood taking needle

Abstract

The utility model relates to the field of medical supplies, and discloses an anti-backflow blood taking needle which comprises a vein blood taking end, a blood taking tube puncture end and a hose for connecting the vein blood taking end and the blood taking tube puncture end, a non-return piece is arranged at the joint of the blood taking tube puncture end and the hose, a silica gel sheet or a silica gel plug is arranged in the non-return piece, and the silica gel sheet or the silica gel plug is connected with the hose. The blood collection tube is used for limiting blood to flow only in the direction from the vein blood collection end to the blood collection tube puncture end. According to the anti-backflow blood taking needle, the non-return piece is arranged between the puncture end of the blood taking tube and the hose to automatically open or close the flow channel, so that blood is effectively prevented from flowing back into the vein of the human body from the blood taking tube in the vein blood taking process, the safety of a person with blood taken is guaranteed, the structure is simple, and the cost is low.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of medical supplies, especially to a backflow prevention blood taking needle. BACKGROUND

[0002] The blood taking needle commonly used in hospitals is matched with other blood taking instruments to collect blood samples from the vein of a patient. In a conventional operation, when blood taking is performed, the blood taking end needle tube of the blood taking needle is first inserted into the vein, the puncture end needle tube pierces the rubber plug of a vacuum blood taking tube, and the blood enters the vacuum blood taking tube through the channel of the blood taking needle under the vacuum suction of the vacuum blood taking tube. As the vacuum degree in the vacuum blood taking tube decreases, the blood taking is finally terminated when the pressure in the vacuum blood taking tube is approximately equal to the pressure of the blood vessel.

[0003] However, when the position of the blood taking tube is higher than that of the blood vessel or the venous pressure of the human body fluctuates, the pressure in the blood taking tube may be greater than the venous pressure of the human body, and the blood taking needle for venous blood taking is currently through, which may cause the blood in the blood taking tube to flow back into the venous blood vessel. In addition, there may be some reagents in the blood taking tube, which may enter the venous blood vessel of the human body when backflow occurs, and may cause adverse effects and safety hazards. SUMMARY

[0004] Based on the above problems, the utility model aims to provide a backflow prevention blood taking needle to prevent blood backflow that may occur when blood samples are collected.

[0005] To achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A backflow prevention blood taking needle comprises a venous blood taking end, a blood taking tube puncture end, and a hose connecting the venous blood taking end and the blood taking tube puncture end, wherein a backflow prevention piece is arranged at the connection between the blood taking tube puncture end and the hose, a silica gel sheet or a silica gel plug is arranged in the backflow prevention piece, and the backflow prevention piece is used to limit the blood to flow only in the direction from the venous blood taking end to the blood taking tube puncture end.

[0007] As an alternative, the check member comprises an upper cover and a lower cover, the upper cover is connected with the soft tube, the lower cover is connected with the puncture end of the blood collection tube, the upper cover and the lower cover are combined to form a first inner cavity, a silica gel sheet is arranged in the first inner cavity, a convex ring is arranged on the end face of the upper cover in the first inner cavity and outside the hole orifice of the first through hole, the convex ring is used for abutting against the edge of the first side face of the silica gel sheet, a second through hole is arranged on the lower cover and is communicated with the puncture end of the blood collection tube, a convex is arranged on the end face of the lower cover in the first inner cavity, the convex is used for abutting against the center of the second side face of the silica gel sheet, a bypass hole is arranged on the convex and is communicated with the second through hole, when blood flows from the first through hole, the silica gel sheet is deformed, the edge of the first side face of the silica gel sheet is separated from the convex ring, and the blood flows to the second through hole; when blood flows from the second through hole, the silica gel sheet is pressed to press the convex ring, and the blood cannot flow to the first through hole.

[0008] As an alternative, a plurality of support blocks are arranged on the end face of the lower cover in the first inner cavity and are uniformly distributed around the circumference of the convex, each support block limits the edge of the second side face of the silica gel sheet, and a gap is left between adjacent support blocks and is communicated with the bypass hole.

[0009] As an alternative, a plurality of convex blocks are arranged on the side wall of the upper cover in the first inner cavity, and the convex blocks limit the outer edge of the silica gel sheet.

[0010] As an alternative, the upper cover and the lower cover are ultrasonically welded, and concave and convex steps are arranged on the welded surfaces of the upper cover and the lower cover.

[0011] As an alternative, the check member comprises a connecting seat, one end of the connecting seat is connected with the soft tube, the other end of the connecting seat is sleeved on the puncture end of the blood collection tube and forms a second inner cavity, a silica gel plug is arranged in the second inner cavity, a third through hole is arranged on the connecting seat and is communicated with the soft tube, a fourth through hole is arranged on the puncture end of the blood collection tube, a first end of the silica gel plug is inserted into the fourth through hole, and an end portion of the first end is provided with a duckbill-shaped valve flap, when blood flows from the third through hole, the valve flap is opened under the pressure of the inside, the silica gel plug is unblocked, and the blood flows to the fourth through hole; when blood flows from the fourth through hole, the valve flap is closed under the pressure of the outside, the silica gel plug is blocked, and the blood cannot flow to the third through hole.

[0012] As an alternative, the middle part of the silica gel plug is in interference fit with the fourth through hole, the second end of the silica gel plug is located outside the fourth through hole, and an end portion of the second end is provided with a turned edge.

[0013] As an alternative, the venous blood collection end comprises a butterfly wing, a blood collection needle tube is arranged at a first end of the butterfly wing, a first protective sleeve is sleeved on the blood collection needle tube, and a second end of the butterfly wing is communicated with the soft tube.

[0014] As an alternative, the puncture end of the blood collection tube comprises a puncture needle seat, a puncture needle tube is arranged at a first end of the puncture needle seat, a protective cap is arranged outside the puncture needle tube, a second protective sleeve is further arranged outside the protective cap, and a second end of the puncture needle seat is communicated with the check valve.

[0015] The anti-reflux blood collection needle has the advantages that the check valve is arranged between the puncture end of the blood collection tube and the hose, the flow channel is automatically opened or closed, blood flow from the blood collection tube into the venous blood vessel of the human body is effectively prevented during the venous blood collection process, the safety of the blood collection subject is ensured, the structure is simple, and the cost is low. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is an external view of the anti-reflux blood collection needle provided in Embodiment 1 of the utility model;

[0017] Figure 2 is a sectional view of the anti-reflux blood collection needle provided in Embodiment 1 of the utility model;

[0018] Figure 3 is an explosion view of the anti-reflux blood collection needle provided in Embodiment 1 of the utility model;

[0019] Figure 4 is an enlarged view of A of Figure 2

[0020] Figure 5 is a structure schematic view of the upper cover in the anti-reflux blood collection needle provided in Embodiment 1 of the utility model;

[0021] Figure 6 is a structure schematic view of the lower cover in the anti-reflux blood collection needle provided in Embodiment 1 of the utility model;

[0022] Figure 7 is an external view of the anti-reflux blood collection needle provided in Embodiment 2 of the utility model;

[0023] Figure 8 is a sectional view of the anti-reflux blood collection needle provided in Embodiment 2 of the utility model;

[0024] Figure 9 is an explosion view of the anti-reflux blood collection needle provided in Embodiment 2 of the utility model;

[0025] Figure 10 is an enlarged view of B of Figure 8

[0026] In the drawings:

[0027] 1, venous blood collection end; 11, butterfly wing; 12, blood collection needle tube; 13, first protective sleeve;

[0028] ​​2, blood collection tube puncture end; 21, puncture needle seat; 22, puncture needle tube; 23, second protective sleeve; 24, cap;

[0029] 3, hose;

[0030] 4, check element;

[0031] 41, upper cover; 411, first through hole; 412, convex ring; 413, convex block; 414, concave and convex step; 42, lower cover; 421, protrusion; 422, bypass hole; 423, support block; 43, first inner cavity; 44, silica gel piece; 45, connecting seat; 46, second inner cavity; 47, silica gel plug; 471, valve clack; 472, flange. DETAILED DESCRIPTION

[0032] The utility model will be further explained in detail below in combination with the drawings and examples. It can be understood that the specific examples described here are only used to explain the utility model, and not limited to the utility model. In addition, it should be noted that in order to facilitate the description, only the part related to the utility model is shown in the drawings, not all structures.

[0033] In the description of the utility model, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated, it can be mechanically connected, or it can be electrically connected, it can be directly connected, or it can be indirectly connected through an intermediate medium, it can be the internal communication of two elements or the interaction relationship of two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0034] In the utility model, unless otherwise explicitly specified and limited, the first feature "on" or "below" the second feature can include that the first and second features are in direct contact, or the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "above" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0035] In the description of the present embodiment, the terms "upper", "lower", "left", "right" and the like orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second" are only used to distinguish in description, and have no special meaning.

[0036] Embodiment 1:

[0037] Please refer to Figures 1 to 6 As shown in the figure, the present embodiment provides a backflow prevention blood collection needle, which comprises a venous blood collection end 1, a blood collection tube puncture end 2 and a hose 3 connecting the venous blood collection end 1 and the blood collection tube puncture end 2, wherein a non-return element 4 is arranged at the connection between the blood collection tube puncture end 2 and the hose 3, and the non-return element 4 is used to limit the blood to flow only in the direction from the venous blood collection end 1 to the blood collection tube puncture end 2.

[0038] Therefore, by arranging the non-return element 4 between the blood collection tube puncture end 2 and the hose 3, the flow channel is automatically opened or closed, thereby effectively preventing the blood from flowing back into the human venous blood vessel from the blood collection tube during the venous blood collection process, ensuring the safety of the blood collection subject, and the structure is simple and the cost is low.

[0039] Specifically, the non-return element 4 comprises an upper cover 41 and a lower cover 42, the upper cover 41 is connected with the hose 3, the lower cover 42 is connected with the blood collection tube puncture end 2, the upper cover 41 and the lower cover 42 are combined to form a first inner cavity 43, a silica gel sheet 44 is arranged in the first inner cavity 43, a first through hole 411 is arranged on the upper cover 41 and communicates with the hose 3, a convex ring 412 is arranged on the end face of the upper cover 41 in the first inner cavity 43 and outside the hole mouth of the first through hole 411, the convex ring 412 is used to abut against the edge of the first side face of the silica gel sheet 44, a second through hole is arranged on the lower cover 42 and communicates with the blood collection tube puncture end 2, a convex 421 is arranged on the end face of the lower cover 42 in the first inner cavity 43, the convex 421 is used to abut against the center of the second side face of the silica gel sheet 44, and a bypass hole 422 is arranged on the convex 421 and communicates with the second through hole.

[0040] When the blood flows from the first through hole 411, the silica gel sheet 44 is deformed, the edge of the first side face of the silica gel sheet 44 is separated from the convex ring 412, and the blood flows to the second through hole through the bypass hole 422;

[0041] When the blood flows from the second through hole, the silica gel sheet 44 is pressed and pressed against the convex ring 412, and the blood cannot flow to the first through hole 411, thereby realizing the function of allowing blood to flow only in one direction.

[0042] Optionally, the end face of the lower cover 42 in the first inner cavity 43 is provided with a plurality of support blocks 423 evenly distributed around the circumference of the protrusion 421, each support block 423 limiting the edge of the second side of the silica gel sheet 44, and a gap is left between adjacent support blocks 423, which communicates with the bypass hole 422, ensuring that the silica gel sheet 44 deforms and resets within the allowable range.

[0043] Optionally, the side wall of the upper cover 41 in the first inner cavity 43 is provided with a plurality of protrusions 413, which limit the outer edge of the silica gel sheet 44, ensuring that the silica gel sheet 44 is accurately installed and reset in place.

[0044] Optionally, the upper cover 41 and the lower cover 42 are ultrasonically welded, and the welding surfaces of the two are provided with concave-convex steps 414, ensuring the sealing of the first inner cavity 43.

[0045] Specifically, the venous blood sampling end 1 includes a butterfly wing 11, a blood sampling needle tube 12 is provided at the first end of the butterfly wing 11, a first protective sleeve 13 is provided outside the blood sampling needle tube 12, and the second end of the butterfly wing 11 communicates with the hose 3.

[0046] Specifically, the blood collection tube puncture end 2 includes a puncture needle seat 21, a puncture needle tube 22 is provided at the first end of the puncture needle seat 21, a second protective sleeve 23 is provided outside the puncture needle tube 22, and the second end of the puncture needle seat 21 communicates with the check valve 4, that is, the puncture needle seat 21 is interference-fitted with the lower cover 42 of the check valve 4, the upper cover 41 of the check valve 4 is connected to the hose 3, and the silica gel sheet 44 is clamped by the upper cover 41 and the lower cover 42.

[0047] Therefore, when collecting a blood sample, the silica gel sheet 44 deforms under the venous pressure and the negative pressure of the vacuum blood collection tube, a path is formed from the venous blood sampling end 1 to the blood collection tube puncture end 2, blood automatically flows into the vacuum blood collection tube, and blood collection is completed; when blood backflow occurs, the silica gel sheet 44 automatically resets due to the pressure, and the path from the blood collection tube puncture end 2 to the venous blood sampling end 1 is blocked, achieving the effect of preventing blood backflow.

[0048] Embodiment 2:

[0049] Please refer to Figures 7 to 10 As shown in the drawings, the embodiment provides another backflow-preventing blood sampling needle, which includes a venous blood sampling end 1, a blood collection tube puncture end 2, and a hose 3 connecting the venous blood sampling end 1 and the blood collection tube puncture end 2, wherein the connection between the blood collection tube puncture end 2 and the hose 3 is provided with a check valve 4, which is used to limit the blood to flow only in the direction from the venous blood sampling end 1 to the blood collection tube puncture end 2.

[0050] The difference between the embodiment 1 is that the check member 4 here includes a connecting seat 45, one end of the connecting seat 45 is connected with the hose 3, the other end of the connecting seat 45 is sleeved on the blood collection tube puncture end 2 and forms a second inner cavity 46, a silica gel plug 47 is arranged in the second inner cavity 46, a third through hole is arranged on the connecting seat 45 and communicates with the hose 3, a fourth through hole is arranged on the blood collection tube puncture end 2, a first end of the silica gel plug 47 extends into the fourth through hole and an end of the first end is provided with a duckbill-shaped valve flap 471.

[0051] When the blood flows from the third through hole, the valve flap 471 is opened by the inside pressure, the silica gel plug 47 is unblocked, and the blood flows to the fourth through hole;

[0052] When the blood flows from the fourth through hole, the valve flap 471 is closed by the outside pressure, the silica gel plug 47 is blocked, and the blood cannot flow to the third through hole.

[0053] Optionally, a middle part of the silica gel plug 47 is in interference fit with the fourth through hole, a second end of the silica gel plug 47 is located outside the fourth through hole and an end of the second end is provided with a flange 472, so as to ensure that the silica gel plug 47 is reliably assembled and ensure its functionality.

[0054] Specifically, the venous blood collection end 1 includes a butterfly wing 11, a first end of the butterfly wing 11 is provided with a blood needle tube 12, the blood needle tube 12 is sleeved with a first protective sleeve 13, and a second end of the butterfly wing 11 communicates with the hose 3.

[0055] Specifically, the blood collection tube puncture end 2 includes a puncture needle seat 21, a first end of the puncture needle seat 21 is provided with a puncture needle tube 22, the puncture needle tube 22 is sleeved with a cap 24, and the cap 24 is further provided with a second protective sleeve 23, a second end of the puncture needle seat 21 communicates with the check member 4, that is, the puncture needle seat 21 is in interference fit with the connecting seat 45 of the check member 4, and the connecting seat 45 is in butt joint with the hose 3, and the silica gel plug 47 is arranged in the fourth through hole of the puncture needle seat 21.

[0056] Therefore, when collecting a blood sample, the valve flap 471 of the silica gel plug 47 is opened by the venous pressure and the negative pressure of the vacuum blood collection tube, a path is formed from the venous blood collection end 1 to the blood collection tube puncture end 2, the blood automatically flows into the vacuum blood collection tube, and blood collection is completed; when blood reflux occurs, the valve flap 471 of the silica gel plug 47 is closed due to the pressure, and the path from the blood collection tube puncture end 2 to the venous blood collection end 1 is blocked, so as to prevent blood reflux.

[0057] Obviously, the above embodiments of the present application are merely examples for clearly illustrating the present application, and are not intended to limit the implementation modes of the present application. For those skilled in the art, various obvious changes, re-adjustments and replacements can be made without departing from the protection scope of the present application. Here, it is not necessary and also impossible to enumerate all the implementation modes. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application claim.

Claims

1. Anti-reflux blood taking needle comprising a venous blood taking end (1), a blood collection tube puncture end (2) and a hose (3) connecting the venous blood taking end (1) and the blood collection tube puncture end (2), characterized in that The connection between the blood collection tube puncture end (2) and the hose (3) is provided with a check element (4), and a silica gel sheet (44) is arranged in the check element (4) and used for limiting the blood to flow only in the direction from the venous blood collection end (1) to the blood collection tube puncture end (2). The check element (4) comprises an upper cover (41) and a lower cover (42), the upper cover (41) is connected with the hose (3), the lower cover (42) is connected with the blood collection tube puncture end (2), the upper cover (41) and the lower cover (42) are combined and form a first inner cavity (43), the first inner cavity (43) is provided with the silica gel sheet (44), the upper cover (41) is provided with a first through hole (411) in communication with the hose (3), a convex ring (412) is arranged on the end face of the upper cover (41) in the first inner cavity (43) and located outside the hole orifice of the first through hole (411), the convex ring (412) is used for abutting against the edge of the first side face of the silica gel sheet (44), the lower cover (42) is provided with a second through hole in communication with the blood collection tube puncture end (2), a convex (421) is arranged on the end face of the lower cover (42) in the first inner cavity (43), the convex (421) is used for abutting against the center of the second side face of the silica gel sheet (44), and the convex (421) is provided with a bypass hole (422) in communication with the second through hole, When the blood flows from the first through hole (411), the silica gel sheet (44) is deformed, the edge of the first side face of the silica gel sheet (44) is separated from the convex ring (412), and the blood flows to the second through hole; When the blood flows from the second through hole, the silica gel sheet (44) is pressed and pressed against the convex ring (412), and the blood cannot flow to the first through hole (411).

2. The backflow resistant blood collection lancet of claim 1 wherein, A plurality of support blocks (423) are arranged on the end face of the lower cover (42) in the first inner cavity (43) and are uniformly distributed around the circumference of the convex (421), each support block (423) limits the edge of the second side face of the silica gel sheet (44), and gaps in communication with the bypass hole (422) are left between adjacent support blocks (423).

3. The backflow resistant blood collection lancet of claim 1 wherein, A plurality of convex blocks (413) are arranged on the side wall of the upper cover (41) in the first inner cavity (43), and the convex blocks (413) limit the outer edge of the silica gel sheet (44).

4. The anti-backflow blood lancet according to claim 1, wherein The upper cover (41) and the lower cover (42) are ultrasonically welded, and recessed and convex steps (414) are arranged on the welded surfaces of the upper cover (41) and the lower cover (42).

5. The backflow resistant blood collection lancet of claim 1 wherein, The venous blood collection end (1) comprises a butterfly wing (11), a blood collection needle tube (12) is arranged at the first end of the butterfly wing (11), a first protective sleeve (13) is arranged on the blood collection needle tube (12), and the second end of the butterfly wing (11) is in communication with the hose (3).

6. The anti-backflow blood lancet of claim 1, wherein, The puncture end (2) of the blood collection tube comprises a puncture needle seat (21), a puncture needle tube (22) is arranged at a first end of the puncture needle seat (21), a cap (24) is arranged outside the puncture needle tube (22), a second protective sleeve (23) is further arranged outside the cap (24), and a second end of the puncture needle seat (21) is communicated with the check element (4).

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