Double-layer centrifugal blood sampling cannula

Abstract

The utility model provides a double-layer centrifugal blood sampling cannula which comprises a centrifugal tube and an injector which is coaxial with the centrifugal tube and detachably arranged in the centrifugal tube, a positioning seat is sleeved on the outer ring of the injector, and the outer circumferential surface of the positioning seat is attached to the inner circumferential surface of the centrifugal tube. According to the utility model, the positioning of the injector is realized through the arrangement of the positioning seat, so that the injector is prevented from shaking during centrifugation; moreover, after centrifugation is completed and an injector is taken out of a centrifugal tube, centrifugal layered substances can be discharged layer by layer by pushing a core rod of the injector, the centrifugal layered substances-PRP layer can be easily injected or directly sprayed on a wound part, the structural design is reasonable, and the centrifugal layered substances can be conveniently used and operated; in addition, the injector of the existing specification can be matched with the centrifugal tube of the existing specification by means of the positioning seat, and a special centrifugal tube and a special centrifugal machine do not need to be designed.

Description

Technical Field

[0001] The utility model relates to the field of medical equipment, in particular to a double-layer centrifugal blood sampling cannula. Background Art

[0002] The commonly used vacuum blood collection tubes have thin walls and are usually made of plastic or glass. These materials are easy to break or deform under high centrifugal force. Therefore, they are only suitable for various blood test items such as routine blood tests, biochemical tests, and coagulation function tests. For operations that require high centrifugal force (such as the preparation of platelet-rich plasma (PRP), which usually requires a centrifugal force of 400-700g or even higher), the most commonly used method for preparing PRP is the double centrifugation method, which has the following specific steps: (1) First centrifugation: centrifuge the collected blood at a relative centrifugal force of 100-300 g for 5-10 minutes to allow the red blood cells to settle; (2) transfer the supernatant: transfer the supernatant (containing platelets and white blood cells) to another sterile tube; (3) second centrifugation: centrifuge at a relative centrifugal force of 400-700 g for 10-17 minutes to allow the platelets to settle; (4) prepare PRP: after removing the supernatant, resuspend the platelets in a small amount of plasma to obtain PRP. However, this method of preparing PRP requires the replacement of the blood container, and the operation of replacing the container will increase the risk of contamination. Based on this, the prior art also proposes: using a double-layer blood collection centrifuge sleeve composed of an inner tube and an outer tube to prepare PRP. For example: The Chinese patent with the authorization announcement number CN217852988U discloses a blood collection device, including a syringe arranged in a centrifuge tube, and a needle is installed on the top of the syringe; after blood is collected by the syringe, the entire syringe is loaded into the centrifuge tube for centrifugation. After the blood collection device of this patent collects blood through the needle, the syringe is centrifuged in the sleeve to achieve the stratification of PRP, and PRP is obtained by pushing the push rod collector. It does not require the replacement of the blood container, avoiding the risk of contamination caused by the operation of replacing the container. However, the problem of low matching between the syringe and the centrifuge tube needs to be solved to avoid the problems caused by the low matching between the two, such as the syringe is prone to shaking during centrifugation and cannot be applied to existing centrifuges. Utility Model Content

[0003] The utility model aims to provide a double-layer centrifugal blood sampling cannula, which has a simple structure and is easy to assemble, and can improve the stability of the syringe during centrifugation.

[0004] The technical solution to achieve the purpose of the utility model is: a double-layer centrifugal blood sampling cannula, including a centrifugal tube and a coaxial and detachable syringe installed in the centrifugal tube, the outer ring of the syringe is provided with a positioning seat, and the outer peripheral surface of the positioning seat is in contact with the inner peripheral surface of the centrifugal tube.

[0005] The utility model realizes the positioning of the syringe through the setting of the positioning seat, avoiding the shaking of the syringe during centrifugation. Moreover, after centrifugation is completed and the syringe is taken out of the centrifuge tube, pushing the plunger of the syringe can realize the layer-by-layer discharge of the centrifugally stratified substance, easily realizing the injection or direct spraying of the centrifugally stratified substance - the PRP layer on the wound site. The structure is reasonably designed and convenient for the use operation of the centrifugally stratified substance. In addition, the utility model can realize the matching between syringes of existing specifications and centrifuge tubes of existing specifications by means of the positioning seat, without designing special centrifuge tubes and special centrifuges.

[0006] Further, the head end of the syringe is installed inwardly in the centrifuge tube. The centrifuge tube includes a tube body and a cover body covering the open end at the tail end of the tube body. The syringe is encapsulated in the centrifuge tube through the cover, and the syringe is convenient to load and unload.

[0007] Further, the syringe includes a barrel. A barrel stop portion for engaging with the end face of the head end of the barrel in a circumferential direction is provided on the inner circumferential surface of the positioning seat.

[0008] Further, a positioning seat stop portion for engaging with the end face of one end of the positioning seat facing the head end of the syringe in a circumferential direction is provided on the inner circumferential surface of the centrifuge tube, realizing the quick installation in place of the positioning seat and the syringe.

[0009] Further, a venous puncture needle assembly is connected to the head end of the barrel. The venous puncture needle assembly includes a needle head and a connecting hose connected between the needle head and the barrel. A tubular needle head storage bin is provided on the outer circumferential surface of the barrel along its axial direction. One end of the needle head storage bin is open, and the open end serves as the needle head inlet. The needle head inlet of the needle head storage bin faces the tail end of the syringe. After the connecting hose is bent, the needle head can be inserted into the needle head storage bin from the needle head inlet. The needle head of the utility model is properly stored in the needle head storage bin during centrifugation, reducing the risk of bacterial contamination. Furthermore, a needle head storage bin relief groove is provided inside the positioning seat, and the needle head storage bin can be limited in the needle head storage bin relief groove, further enhancing the stability of the syringe during centrifugation.

[0010] At the same time, a connecting hose relief groove is also provided inside the positioning seat, and the connecting hose can be limited in the connecting hose relief groove. A plurality of axial grooves are evenly opened in a circumferential direction on the inner circumferential surface of the positioning seat. One of the adjacent two axial grooves serves as the needle head storage bin relief groove, and the other axial groove serves as the connecting hose relief groove. In the specific implementation process, the bent connecting hose can be fixed to the outer circumferential surface of the barrel with tape. Description of the Drawings

[0011] Figure 1 is a schematic axial sectional structure view of a double - layer centrifugal blood collection sleeve of the present utility model;

[0012] Figure 2 is a schematic top - view structure view of a positioning seat of the present utility model;

[0013] Figure 3 is a three - dimensional structure view of a syringe of the present utility model, in which the needle storage chamber is a perspective structure view. Specific embodiments

[0014] The following will make a detailed description of the specific embodiments of the double - layer centrifugal blood collection sleeve of the present utility model with reference to the accompanying drawings:

[0015] As shown in Figure 1, a double - layer centrifugal blood collection sleeve includes a centrifuge tube 10 and a syringe 20 coaxially and detachably installed inside the centrifuge tube 10. A positioning seat 30 is sleeved outside the syringe 20, and the outer peripheral surface of the positioning seat 30 fits with the inner peripheral surface of the centrifuge tube 10.

[0016] The present utility model can position the syringe 20 to prevent the syringe 20 from shaking during centrifugation; moreover, the structure is reasonably designed, facilitating the operation of using the centrifuged layered substances; in addition, there is no need to design a special centrifuge tube and a special centrifuge.

[0017] Further, as shown in Figure 1, the centrifuge tube 10 includes a tube body 11 and a cover body 12 covering the open end at the tail of the tube body 11. The tail end of the syringe 20 is in the same orientation as the tail end of the tube body 11. The syringe 20 is encapsulated in the centrifuge tube 10 through the cover body 12, and the syringe 20 is convenient to load and unload.

[0018] Further, as shown in Figure 1, the syringe 20 includes a syringe barrel 21. A syringe barrel stop portion 31 for stop - mating with the head - end end face 210 of the syringe barrel 21 is circumferentially arranged on the inner peripheral surface of the positioning seat 30, so as to quickly install the syringe in place with the positioning seat 30. Of course, the syringe barrel stop portion 31 may not be provided on the inner peripheral surface of the positioning seat 30.

[0019] Further, as shown in Figure 1, a positioning seat stop portion 13 for stop - mating with one end face of the positioning seat 30 facing the head end of the syringe is circumferentially arranged on the inner peripheral surface of the centrifuge tube 10, so as to quickly install the positioning seat 30, the centrifuge tube 10, and the syringe 20 in place. At this time, the centrifuge tube 10 can be a common existing conical - bottom centrifuge tube.

[0020] Further, as shown in FIGS. 1 and 3, a venous puncture needle assembly 40 is connected to the head end of the syringe barrel 21. The venous puncture needle assembly 40 includes a needle 42 and a connecting hose 41 connected between the needle 42 and the syringe barrel 21. A tubular needle storage chamber 50 is arranged on the outer wall of the syringe barrel 21 along its axial direction; one end of the needle storage chamber 50 is open, and the opening serves as a needle inlet 51. The needle inlet 51 of the needle storage chamber 50 faces the tail end of the syringe 20. After being bent, the connecting hose 41 enables the needle 42 to be inserted into the needle storage chamber 50 from the needle inlet 51. The arrangement of the needle storage chamber 50 of the present utility model enables the needle to be properly stored in the needle storage chamber 50 during centrifugation, reducing the risk of bacterial contamination.

[0021] Furthermore, as shown in FIGS. 1 and 2, a needle storage chamber relief groove 32 is provided inside the positioning seat 30. The needle storage chamber 50 can be limited in the needle storage chamber relief groove 32, further enhancing the stability of the syringe 20 during centrifugation. Furthermore, as shown in FIGS. 1 and 2, a connecting hose relief groove 33 is also provided inside the positioning seat 30. The connecting hose 41 can be limited in the connecting hose relief groove 33. As Figure 2 shown, five axial grooves are evenly formed in the circumferential direction on the inner circumferential surface of the positioning seat 30. One of the adjacent two axial grooves serves as the needle storage chamber relief groove 32, and the other axial groove serves as the connecting hose relief groove 33. Of course, the number of the axial grooves can be but is not limited to five, and their number and size can be adjusted according to needs. Moreover, the needle storage chamber relief groove 32 and the connecting hose relief groove 33 can also share one axial groove. In the specific implementation process, the bent connecting hose 41 can be fixed to the outer circumferential surface of the syringe barrel 21 with tape.

[0022] In order to save space, in the specific implementation process of the present utility model, the following improvements can also be made: As shown in FIG. 1, the syringe 20 further includes a piston 22 located within the syringe barrel 21 and a core rod 23 connected to the piston 22, and the piston 22 and the core rod 23 are detachably connected. After blood collection is completed, the core rod 23 can be detached from the piston 22 for centrifugation to achieve stratification of platelet-rich plasma (PRP), saving the internal space of the centrifuge tube 10, enabling the same-sized centrifuge tube 10 to accommodate and centrifuge more blood without the need for a dedicated centrifuge device. Further, as shown in FIG. 1, a connecting shaft 24 is connected to the piston 22, and a core rod screwing hole 240 is formed in the connecting shaft 24. The end of the core rod 23 is inserted into the core rod screwing hole 240 and is in threaded cooperation with the core rod screwing hole 240. Of course, the piston 22 and the core rod 23 of the syringe 20 can also be directly fixedly connected.

[0023] For those of ordinary skill in the art to which the present utility model pertains, without departing from the concept of the present utility model, several simple deductions or substitutions can be made, and all should be regarded as falling within the protection scope of the present utility model.

Claims

1. A double-layer centrifugal blood collection cannula, characterized in that: The invention comprises a centrifuge tube and a syringe coaxially and detachably mounted in the centrifuge tube, wherein the outer ring sleeve of the syringe is provided with a positioning seat, and the outer peripheral surface of the positioning seat is in contact with the inner peripheral surface of the centrifuge tube; the head end of the syringe is mounted inwardly in the centrifuge tube, and the centrifuge tube comprises a tube body and a cover body arranged at the open end of the tail end of the tube body, and the syringe is encapsulated in the centrifuge tube by the cover; a positioning seat stopper is circumferentially arranged on the inner peripheral surface of the centrifuge tube for stopping and cooperating with the end face of the positioning seat facing the head end of the syringe; the syringe comprises a syringe, and the head end of the syringe is connected to a venous puncture needle assembly, and the The intravenous puncture needle assembly includes a needle and a connecting hose connected between the needle and the syringe, a tubular needle storage bin is arranged on the outer peripheral surface of the syringe along its axial direction; one end of the needle storage bin is opened and the opening serves as a needle entrance, the needle entrance of the needle storage bin is arranged toward the rear end of the syringe, and the connecting hose is bent so that the needle can be inserted into the needle storage bin from the needle entrance; a needle storage bin yield groove is arranged on the inner side of the positioning seat; the syringe also includes a piston located in the syringe and a core rod connected to the piston, and the piston and the core rod are detachably connected.

2. The double-layer centrifugal blood sampling cannula according to claim 1, characterized in that: A syringe stopper for engaging with the end face of the head end of the syringe is circumferentially arranged on the inner circumferential surface of the positioning seat.

3. The double-layer centrifugal blood sampling cannula according to claim 1, characterized in that: The bent connecting hose is fixed to the outer peripheral surface of the syringe by means of adhesive tape.

4. The double-layer centrifugal blood sampling cannula according to claim 1, characterized in that: A plurality of axial grooves are evenly arranged on the inner side of the positioning seat along the circumferential direction, one of two adjacent axial grooves is used as a make-away groove for the needle receiving bin, and the other axial groove is used as a make-away groove for the connecting hose.

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