Special blood collector

Abstract

The invention discloses a special hemostix, and belongs to the field of medical instruments, the special hemostix comprises a needle head, the needle head comprises a conical section and a cylindrical section, the cylindrical section is internally provided with a cavity I, the conical section is provided with a one-way valve I along the axial direction of the cylindrical section, and external fluid can enter the cavity I through the one-way valve I; the blood collection tube is coaxially connected with the needle head, a second cavity is formed in the blood collection tube in the axial direction, and the second cavity is communicated with the first cavity; a third cavity is formed in the needle cylinder in the axial direction, and an opening communicating with the third cavity is formed in one end, in the axial direction, of the needle cylinder; the blood collection tube can be movably arranged in the third cavity, the blood collection tube can move to an initial position and enable the needle head to be contained in the third cavity, and the blood collection tube can move to a blood collection position and enable the needle head to extend out of the third cavity. By means of the arrangement, blood can be collected on an extracorporeal circulation pipeline, and needle stick injuries are avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of medical devices, and in particular relates to a special blood sampling device. Background Art

[0002] When drawing blood, you need to prick your finger to draw blood from the tip; in addition, during hemodialysis, the patient will use an extracorporeal circulation circuit, and the extracorporeal circulation circuit itself has a blood collection point. Therefore, for dialysis patients who need to test their blood sugar concentration by blood drawing, blood can be drawn directly from the extracorporeal circulation circuit and used for blood sugar testing.

[0003] Usually, the amount of blood required for blood sugar concentration testing is 0.5 to 1 ml, but currently medical staff use 1 ml or 2 ml syringes when drawing blood, which is not conducive to accurately controlling the volume of blood collected.

[0004] The currently used blood collection needle needs to be put back on the needle cap after the needle is pulled out, which poses a risk of needlestick injuries. After blood collection is completed, blood glucose testing is performed by allowing the blood to drip onto a test strip under the action of gravity. Therefore, there is also the problem of blood contaminating the testing environment due to deviation in the landing point.

[0005] Therefore, a blood collection device is designed that can avoid needle stick injuries when collecting blood on an extracorporeal circulation line and prevent blood contamination when the collected blood is input into a blood glucose test strip. The blood collection device is specifically a special blood collector. Summary of the invention

[0006] In order to overcome the problems raised in the background technology, the present invention adopts the following technical solutions:

[0007] A special blood collector, comprising: a needle, comprising a conical section and a cylindrical section, a cavity one being arranged inside the cylindrical section, a one-way valve one being arranged on the conical section along the axial direction of the cylindrical section, and external fluid can enter the cavity one through the one-way valve one; a blood collection tube, the blood collection tube is coaxially connected to the needle, a cavity two being arranged inside the blood collection tube along the axial direction, and the cavity two being communicated with the cavity one; a syringe, a cavity three being arranged inside the syringe along the axial direction, and one of the axial ends of the syringe having an opening connected with the cavity three; the blood collection tube is movably arranged in the cavity three, the blood collection tube can move to an initial position and accommodate the needle in the cavity three, and the blood collection tube can move to a blood collection position and extend the needle out of the cavity three.

[0008] Furthermore, a piston is axially arranged in the syringe. When the blood collection tube moves in the syringe, the piston is always sleeved on the second cavity in the blood collection tube. When the blood collection tube moves from the initial position to the blood collection position, the piston moves in the direction of leaving the second cavity and forms a negative pressure in the second cavity. The negative pressure attracts the fluid outside the conical section into the needle through the one-way valve one.

[0009] Furthermore, a stroke groove is provided in the axial direction on the outer wall of the syringe, and a limit slider is provided on the outer wall of the blood collection tube. The limit slider extends out of the stroke groove in the radial direction of the central axis of cavity two and can reciprocate along the central axis of cavity two. The limit slider, which can only move in the stroke groove, limits the circumferential rotation of the blood collection tube during reciprocating motion. At the same time, the stroke groove also limits the maximum movement stroke of the blood collection tube in the axial direction of cavity three.

[0010] Furthermore, the opening is provided with an elastic flap, which is closed when the blood collection tube is in the initial position, and when the blood collection tube is out of the initial position and the needle extends out of cavity three through the opening, the elastic flap is retracted inward and abuts against the outer wall of the needle, so that the elastic flap can prevent the fluid in cavity three from passing through the opening when the blood collection tube is in any position of the stroke. When blood separates from the needle and moves toward the collection slot, the blood falling into cavity three will not overflow outward through the opening, thereby reducing the risk of blood contamination.

[0011] Furthermore, a collecting groove is axially provided on the outer wall of the syringe, and a water absorption structure is arranged in the collecting groove. The end face of the water absorption structure facing the cavity three coincides with the inner wall of the syringe, and the thickness of the water absorption structure in the radial direction of the cavity three is greater than the thickness of the outer wall of the syringe, so that the water absorption structure protrudes outward from the outer wall of the needle.

[0012] Furthermore, a one-way valve 2 is provided on the cylindrical section of the needle and passes through the radial direction of cavity 1. When the blood collection tube moves to the initial position, the piston moves toward the direction of entering cavity 2 and forms a positive pressure in cavity 2. The positive pressure drives the fluid in cavity 1 to separate from the needle through the one-way valve 2. When the blood collection tube moves from the blood collection position to the initial position, the one-way valve 2 faces the water absorption structure, and the fluid that separates from cavity 1 enters the water absorption structure driven by the positive pressure.

[0013] Furthermore, a gasket is arranged around the outer wall of the syringe, and the number of the gaskets is at least two, and the adjacent gaskets are distributed in a linear array along the axial direction of the syringe; the thickness of the gasket in the radial direction of the syringe is greater than the thickness of the water absorption structure in the radial direction of the syringe, so that the water absorption structure always has a distance from the environmental surface in contact with the syringe when the syringe rolls, thereby effectively preventing the water absorption structure from contacting various planes in the treatment environment when the syringe rolls, thereby preventing blood contamination from occurring.

[0014] Furthermore, the cavity three includes a limiting section, the inner diameter of which is larger than the outer diameter of the needle, and the inner diameter of which is smaller than the outer diameter of the blood collection tube, and the limiting section limits the movement range of the blood collection tube in its own axial direction.

[0015] Furthermore, a connecting hole is provided between the cavity one and the cavity two, the diameter of the connecting hole is smaller than the inner diameter of the cavity one, and the inner diameter of the connecting hole is smaller than the inner diameter of the cavity two.

[0016] Furthermore, the central axis of cavity 1 coincides with the central axis of cavity 2, and the central axis of cavity 2 coincides with the central axis of cavity 3. The blood collection tube is coaxial with the syringe, and the needle is coaxial with the blood collection tube, which is conducive to reducing production difficulty and improving structural stability.

[0017] Beneficial effects of the present invention:

[0018] 1. A one-way valve 1 is provided at the tip of the needle, which only allows the fluid to be sucked into the cavity 1, so that it is difficult for the blood to flow back after entering the cavity 1; an opening with an elastic valve is provided at the end where the needle protrudes from the syringe, and when the needle is retracted into the syringe, even if blood flows out of the needle, it will not escape from the syringe through the opening; through the above arrangement, blood can be prevented from contaminating the detection environment, and after the needle is retracted into the syringe, the elastic valve can also prevent the needle from stabbing medical staff or patients, which has an excellent safety protection effect.

[0019] 2. The outer wall of the needle is provided with a one-way valve 2 that enables the fluid to be ejected in one direction. A piston with a fixed position is axially provided at one end of the syringe away from the needle, and the piston is sleeved on the cavity 2 of the blood collection tube. When the blood collection tube moves from the initial position to the blood collection position, the piston gradually withdraws from the cavity 2 to generate negative pressure in the cavity 2, which enables blood to enter the blood collection tube from the needle inserted into the blood collection point. A collection groove filled with a water absorption structure is provided on the outer wall of the syringe. When the blood collection is completed, the needle can be retracted into the syringe by pushing the limit slider. At this time, the blood collection tube moves toward the initial position, and the space of the cavity 2 is compressed by the piston and generates positive pressure. At this time, the blood flows back into the cavity 1 and is sprayed into the water absorption structure in the collection groove through the one-way valve 2. When medical staff need to measure the patient's blood sugar, they only need to squeeze the test paper and the water absorption structure to obtain sufficient blood. When the blood is ejected outward through the one-way valve 2, even if the blood does not enter the collection groove and moves toward the opening along the outer wall of the needle, it cannot flow out of the syringe through the elastic valve, which has an excellent anti-pollution effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them:

[0021] Figure 1 It is a schematic diagram of the overall structure of Embodiment 1 of the present invention when the blood collection tube is in the initial position;

[0022] Figure 2 for Figure 1 A schematic cross-sectional structure diagram of ;

[0023] Figure 3 Schematic diagram of the cross-sectional structure when the needle is connected to the blood collection tube in Example 1;

[0024] Figure 4 It is a schematic diagram of an overall structure of the present invention when the blood collection tube in Example 1 is in the blood collection position;

[0025] Figure 5 for Figure 4 A schematic cross-sectional structure diagram of ;

[0026] Figure 6 Schematic diagram of the cross-sectional structure of the syringe in Example 1;

[0027] Figure 7 This is a schematic diagram of the overall structure of Embodiment 2 of the present invention after assembly;

[0028] Figure 8 This is a schematic diagram of the structure of Example 2 of the present invention when the test paper is not assembled;

[0029] In the figure, 1, needle; 11, conical section; 111, one-way flap 1; 12, cylindrical section; 121, cavity 1; 122, one-way flap 2; 2, blood collection tube; 21, cavity 2; 22, connecting hole; 23, limit slider; 3, syringe; 31, cavity 3; 311, limit section; 32, opening; 321, elastic flap; 33, piston; 34, stroke groove; 35, collection groove; 351, water absorption structure; 36, gasket; 37, fixing belt; 38, collection slot; 381, through hole; 382, ​​test paper. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present invention are described clearly and completely below through specific embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation methods. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] Example 1

[0032] A special blood collection device, such as Figure 1-6 As shown, it includes: a needle 1, including a conical section 11 and a cylindrical section 12, a cavity 121 is arranged inside the cylindrical section 12, and a one-way valve 111 is arranged along the axial direction of the cylindrical section 12 of the conical section 11, and the external fluid can enter the cavity 121 through the one-way valve 111; a blood collection tube 2, the blood collection tube 2 is coaxially connected to the needle 1, and a cavity 21 is arranged axially inside the blood collection tube 2, and the cavity 21 is connected to the cavity 121; a syringe 3, a cavity 31 is arranged axially inside the syringe 3, and one of the ends of the syringe 3 in the axial direction has an opening 32 connected to the cavity 31; the blood collection tube 2 is movably arranged in the cavity 31, the blood collection tube 2 can move to an initial position and accommodate the needle 1 in the cavity 31, and the blood collection tube 2 can move to a blood collection position and extend the needle 1 out of the cavity 31. When the blood collection tube 2 moves from the initial position to the blood collection position, the needle 1 extends from the syringe 3. At this time, the needle 1 can be inserted into the blood collection point on the extracorporeal circulation pipeline to perform a blood collection operation.

[0033] A more preferred embodiment is as follows Figure 1-6 As shown, a piston 33 is axially arranged in the syringe 3. When the blood collection tube 2 moves in the syringe 3, the piston 33 is always sleeved on the cavity 21 in the blood collection tube 2; when the blood collection tube 2 moves from the initial position to the blood collection position, the piston 33 moves in the direction of leaving the cavity 21 and forms a negative pressure in the cavity 21. The negative pressure attracts the fluid outside the conical section 11 to enter the needle 1 through the one-way valve 111.

[0034] A more preferred embodiment is as follows Figure 1-6 As shown, a travel groove 34 is provided in the axial direction on the outer wall of the syringe 3, and a limit slider 23 is provided on the outer wall of the blood sampling tube 2. The limit slider 23 extends out of the travel groove 34 in the radial direction of the central axis of the cavity 21 and can reciprocate along the central axis of the cavity 21. The limit slider 23, which can only move in the travel groove 34, limits the circumferential rotation of the blood sampling tube 2 during the reciprocating motion. At the same time, the travel groove 34 also limits the maximum movement stroke of the blood sampling tube 2 in the axial direction of the cavity 31.

[0035] A more preferred embodiment is as follows Figure 1-6 As shown, the opening 32 is provided with an elastic flap 321. When the blood collection tube 2 is in the initial position, the elastic flap 321 is closed. When the blood collection tube 2 is out of the initial position and the needle 1 extends out of the cavity 31 through the opening 32, the elastic flap 321 is retracted inward and abuts against the outer wall of the needle 1. This enables the elastic flap 321 to prevent the fluid in the cavity 31 from passing through the opening 32 when the blood collection tube 2 is in any position in the stroke. When the blood is separated from the needle 1 and moves toward the collection groove 35, the blood falling into the cavity 31 will not overflow outward through the opening 32, thereby reducing the risk of blood contamination.

[0036] A more preferred embodiment is as follows Figure 1-6 As shown, the outer wall of the syringe 3 is provided with a collection groove 35 along the axial direction, and a water absorption structure 351 is arranged in the collection groove 35. The end surface of the water absorption structure 351 facing the cavity 31 coincides with the inner wall of the syringe 3, and the thickness of the water absorption structure 351 in the radial direction of the cavity 31 is greater than the thickness of the outer wall of the syringe 3, so that the water absorption structure 351 protrudes outward from the outer wall of the needle 1. Specifically, the water absorption structure 351 is a spherical or rectangular medical cotton.

[0037] A more preferred embodiment is as follows Figure 1-6 As shown, the cylindrical section 12 of the needle 1 is provided with a one-way flap 2 122 running through the radial direction of the cavity 1 121. When the blood collection tube 2 moves toward the initial position, the piston 33 moves toward the direction of entering the cavity 2 21 and forms a positive pressure in the cavity 2 21. The positive pressure drives the fluid in the cavity 1 121 to leave the needle 1 through the one-way flap 2 122; when the blood collection tube 2 moves from the blood collection position to the initial position, the one-way flap 2 122 moves toward the water absorption structure 351, and the fluid leaving the cavity 121 enters the water absorption structure 351 under the drive of the positive pressure. In this way, the collected blood can be transferred to the collection groove 35. When measuring blood sugar, the test paper can be directly brought into contact with the water absorption structure 351 protruding from the outer wall of the syringe 3 to transfer the blood absorbed in the water absorption structure 351 to the surface of the test paper, thereby performing blood sugar testing without causing blood contamination.

[0038] A more preferred embodiment is as follows Figure 1-6 As shown, a gasket 36 is arranged around the outer wall of the syringe 3, and the number of the gaskets 36 is at least two, and adjacent gaskets 36 are distributed in a linear array along the axial direction of the syringe 3; the thickness of the gasket 36 in the radial direction of the syringe 3 is greater than the thickness of the water absorption structure 351 in the radial direction of the syringe 3, so that the water absorption structure 351 is always spaced apart from the environmental surface in contact with the syringe 3 when the syringe 3 rolls, thereby effectively preventing the water absorption structure 351 from contacting various planes in the treatment environment when the syringe 3 rolls, thereby preventing blood contamination from occurring.

[0039] A more preferred embodiment is as follows Figure 1-6 As shown, the cavity 31 includes a limiting section 311, the inner diameter of which is larger than the outer diameter of the needle 1, and the inner diameter of which is smaller than the outer diameter of the blood collection tube 2, and the limiting section 311 limits the movement stroke of the blood collection tube 2 in its own axial direction. The limiting section 311 has the same function as the stroke groove 34, both of which limit the maximum axial movement stroke of the blood collection tube 2. Even if the limiting slider 23 in the stroke groove 34 is broken, the limiting section 311 can also limit the movement stroke of the stroke groove 34, so that the blood collection tube 2 cannot be separated from the cavity 31.

[0040] A more preferred embodiment is as follows Figure 1-6 As shown, a connecting hole 22 is provided between the cavity 1 121 and the cavity 2 21, and the diameter of the connecting hole 22 is smaller than the inner diameter of the cavity 1 121, and the inner diameter of the connecting hole 22 is smaller than the inner diameter of the cavity 2 21. The connecting hole 22 can prevent the blood entering the cavity 2 21 from flowing back to the cavity 1 121 too quickly, and can also weaken the influence caused by the water hammer effect of the blood in the cavity 1 121 and the cavity 2 21 when the blood collector moves, thereby avoiding the situation where the blood breaks through the one-way valve 1 111 and pollutes the treatment environment.

[0041] A more preferred embodiment is as follows Figure 1-6 As shown, the central axis of cavity one 121 coincides with the central axis of cavity two 21, and the central axis of cavity two 21 coincides with the central axis of cavity three 31. The blood collection tube 2 is coaxial with the syringe 3, and the needle 1 is coaxial with the blood collection tube 2, which is conducive to reducing the difficulty of production and improving the structural stability. When in use, when the blood collection tube 2 is in the initial position, align the opening 32 with the blood collection point on the extracorporeal circulation pipeline, and then push the limit slider 23 to release the needle 1. After the blood collection is completed, push the limit slider 23 back, so that the needle 1 is not exposed to the external environment as much as possible during the entire operation, and this operation method is conducive to avoiding needle stick injuries during the blood collection process.

[0042] Example 2

[0043] Different from Example 1, Figure 1 , 2As shown in FIGS. 7 and 8, in this embodiment, a fixing belt 37 is also provided for improving the stability of the blood sampling operation. The number of the fixing belts 37 is at least two. The fixing belts 37 are provided on the gasket 36 at the opening 32. Adjacent fixing belts 37 can be connected and form a closed surrounding space. When the user aligns the opening 32 with the blood sampling point on the extracorporeal circulation pipeline, the fixing belt 37 is connected around the extracorporeal circulation pipeline, so that the opening 32 and the extracorporeal circulation pipeline can be stably docked, thereby preventing the blood sampling tube 2 from slipping off the extracorporeal circulation pipeline, and further avoiding the cross infection problem caused by blood spillage or needle puncture. Specifically, the fixing belt 37 is a flexible belt body, one end of each fixing belt 37 is connected to the gasket 36 at the opening 32, and the other end of the fixing belt 37 is provided with a Velcro or a connecting buckle that can be connected to each other. The setting of the Velcro or the connecting buckle is conducive to the flexible adjustment of the inner diameter of the closed surrounding space formed by two or more fixing belts 37.

[0044] A more preferred embodiment is as follows Figure 1 , 2 As shown in Figures 7 and 8, the collection slot 35 is not provided in this embodiment, but a collection slot 38 is provided in this embodiment. The difference between the collection slot 35 and the collection slot 38 is that: in Example 1, the water absorption structure 351 needs to be inserted into the collection slot 35 along the radial direction of the syringe 3. When the water absorption structure 351 is replaced, the water absorption structure 351 needs to be removed from the collection slot 35 first, and then a new water absorption structure 351 is placed. After the old water absorption structure 351 is removed and before the new water absorption structure 351 is installed, the cavity 31 is connected to the outside through the collection slot 35, so there is a risk of cross infection. In the present embodiment, the collection slot 38 has an arc, and a through hole 381 is provided between the collection slot 38 and the cavity three 31. When in use, the test paper 382 needs to be inserted into the collection slot 38. After the test paper 382 is inserted into the collection slot 38, one side faces the outside and the other side faces the through hole 381. The side facing the through hole 381 completely covers the through hole 381. When the user completes blood collection and pushes the needle 1 back, the blood will be sprayed toward the through hole 381 through the one-way valve two 122 and contact the test paper 382, ​​thereby realizing blood sugar detection. When the test paper 382 needs to be replaced, the new test paper 382 is directly inserted from one end of the collection slot 38. When the new test paper 382 is completely pushed into the collection slot 38, the original test paper 382 in the collection slot 38 will be squeezed out, which makes the through hole 381 always in a covered state, thereby reducing the risk of cross infection.

Claims

1. A special blood sampling device, characterized in that: include: The needle comprises a conical section and a cylindrical section, wherein a cavity 1 is arranged inside the cylindrical section, and a one-way valve 1 is arranged along the axial direction of the cylindrical section, and external fluid can enter the cavity 1 through the one-way valve 1; a blood collection tube, wherein the blood collection tube is coaxially connected to the needle, and a cavity 2 is arranged inside the blood collection tube along the axial direction, and the cavity 2 is connected to the cavity 1; A syringe, wherein a cavity three is axially arranged inside, and one of the axial ends of the syringe has an opening connected to the cavity three; the blood collection tube is movably arranged in the cavity three, the blood collection tube can move to an initial position and allow the needle to be accommodated in the cavity three, and the blood collection tube can move to a blood collection position and allow the needle to extend out of the cavity three.

2. A special blood sampling device according to claim 1, characterized in that: A piston is axially arranged in the syringe. When the blood collection tube moves in the syringe, the piston is always sleeved on the second cavity in the blood collection tube. When the blood collection tube moves from the initial position to the blood collection position, the piston moves in the direction of leaving the second cavity and forms a negative pressure in the second cavity. The negative pressure attracts the fluid outside the conical section into the needle through the one-way valve one.

3. A special blood sampling device according to claim 1, characterized in that: The outer wall of the syringe is provided with a travel groove along the axial direction, and a limit slider is provided on the outer wall of the blood collection tube. The limit slider extends out of the travel groove along the radial direction of the center axis of the second cavity and can reciprocate along the center axis of the second cavity.

4. A special blood sampling device according to claim 1, characterized in that: The opening is provided with an elastic flap, which is closed when the blood collection tube is in the initial position, and when the blood collection tube is out of the initial position and the needle extends out of the cavity through the opening, the elastic flap is retracted inwardly and abuts against the outer wall of the needle.

5. A special blood sampling device according to claim 2, characterized in that: A collecting groove is axially provided on the outer wall of the syringe, and a water absorption structure is arranged in the collecting groove. The end surface of the water absorption structure facing the cavity three coincides with the inner wall of the syringe, and the thickness of the water absorption structure in the radial direction of the cavity three is greater than the thickness of the outer wall of the syringe, so that the water absorption structure protrudes outward from the outer wall of the needle.

6. A special blood sampling device according to claim 5, characterized in that: A one-way valve 2 is provided on the cylindrical section of the needle along the radial direction of cavity 1. When the blood collection tube moves to the initial position, the piston moves toward the direction of entering cavity 2 and forms a positive pressure in cavity 2. The positive pressure drives the fluid in cavity 1 to separate from the needle through the one-way valve 2. When the blood collection tube moves from the blood collection position to the initial position, the one-way valve 2 faces the water absorption structure, and the fluid that separates from cavity 1 enters the water absorption structure driven by the positive pressure.

7. A special blood sampling device according to claim 5, characterized in that: A gasket is arranged around the outer wall of the syringe, the number of the gaskets is at least two, and the adjacent gaskets are distributed in a linear array along the axial direction of the syringe; the thickness of the gasket in the radial direction of the syringe is greater than the thickness of the water absorption structure in the radial direction of the syringe.

8. A special blood sampling device according to claim 1, characterized in that: The cavity three includes a limiting section, the inner diameter of which is larger than the outer diameter of the needle, and the inner diameter of which is smaller than the outer diameter of the blood collection tube, and the limiting section limits the movement of the blood collection tube in its own axial direction.

9. A special blood sampling device according to claim 1, characterized in that: A connecting hole is provided between the first cavity and the second cavity, the diameter of the connecting hole is smaller than the inner diameter of the first cavity, and the inner diameter of the connecting hole is smaller than the inner diameter of the second cavity.

10. A special blood sampling device according to claim 1, characterized in that: The central axis of the cavity one coincides with the central axis of the cavity two, and the central axis of the cavity two coincides with the central axis of the cavity three.

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