CN217772911U - Device for preventing catheter from returning blood - Google Patents
Device for preventing catheter from returning blood Download PDFInfo
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- CN217772911U CN217772911U CN202220771679.4U CN202220771679U CN217772911U CN 217772911 U CN217772911 U CN 217772911U CN 202220771679 U CN202220771679 U CN 202220771679U CN 217772911 U CN217772911 U CN 217772911U
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Abstract
The utility model relates to a device for preventing catheter blood return, which belongs to the technical field of medical appliances; the device comprises a shell and a base which are sleeved with each other, wherein communicated cavities are formed in the shell and the base; the cavity is internally provided with a backflow prevention valve which is of a thin-wall structure, the top end of the backflow prevention valve extends outwards to be provided with a step, and the step is used for being assembled and connected with the shell and the base; the bottom of the anti-reflux valve is provided with a cutting seam; a boss is arranged at the bottom of the anti-reflux valve and is crossed with the cutting joint; the cavity is divided into two parts by the anti-reflux valve, and the anti-reflux valve is used for controlling the flowing direction of liquid in the guide pipe. The utility model discloses can effectively prevent the interior blood reflux of body after the infusion, cause stifled pipe, convenient to use, the range of application is wide, the sexual valence relative altitude.
Description
Technical Field
The utility model relates to a device for preventing catheter from returning blood, which belongs to the technical field of medical instruments.
Background
Catheters are a medical device that establishes an important pathway between the outside world and the blood circulation in the body, and can infuse various drugs, including blood products, and blood, intravenously into the blood circulation for therapeutic purposes. Catheters generally include a variety of categories: such as peripheral venous catheters, also known medically as PVC; central venous catheters, also known medically as CVCs; peripherally inserted central venous catheters, also known medically as PICCs; PORT of infusion, also known medically as PORT.
Catheters are typically composed of a body tube and a connector outside the body. The connector is used for connecting an external infusion apparatus. When the infusion apparatus and the connector are separated after the infusion is finished, blood backflow usually occurs in the tube body, and the following technical defects exist in the current measures for preventing the blood backflow:
to prevent blood backflow, i.e., to prevent blood backflow, medical personnel need to seal the tube with positive pressure. The malleation is sealed the pipe and is higher to medical staff operation technique requirement, needs continuous skilled operation, in case operation delay or misoperation, just the blood refluence in the body appears easily, solidifies and blocks the pipe, influences treatment and causes patient's mood uneasiness, even need reset the pipe, causes unnecessary for the patient and hurts pain.
SUMMERY OF THE UTILITY MODEL
The utility model overcomes prior art's is not enough, provides a prevent pipe blood return device, can effectively prevent the interior blood reflux of body after the infusion, causes stifled pipe, convenient to use, and the range of application is wide, the sexual valence relative altitude.
The utility model relates to a device for preventing catheter from returning blood, which comprises a shell and a base which are mutually sleeved, wherein communicated cavities are arranged in the shell and the base;
the cavity is internally provided with a backflow prevention valve which is of a thin-wall structure, the top end of the backflow prevention valve extends outwards to be provided with a step, and the step is used for being assembled and connected with the shell and the base; the bottom of the anti-reflux valve is provided with a cutting seam; the bottom of the anti-reflux valve is provided with a boss which is crossed with the cutting joint;
the cavity is divided into two parts by the anti-reflux valve, and the anti-reflux valve is used for controlling the flowing direction of liquid in the guide pipe.
Preferably, the backflow prevention valve divides the cavity from the housing to the base into a first cavity and a second cavity;
when the pressure difference that the first cavity pressure is larger than the second cavity pressure is larger than delta P1, the cutting joint of the anti-reflux valve expands outwards, the cutting joint opens towards the second cavity, and liquid flows from the first cavity to the second cavity;
when the pressure difference that the first cavity pressure is larger than the second cavity pressure is smaller than delta P1, the cutting seam of the anti-reflux valve is kept closed;
when the pressure difference that the pressure of the first cavity is smaller than that of the second cavity is larger than delta P2, the cutting joint of the anti-reflux valve is concave inwards, the cutting joint is opened towards the first cavity, and liquid flows from the second cavity to the first cavity;
when the pressure difference that the first cavity pressure is smaller than the second cavity pressure is smaller than delta P2, the cutting seam of the anti-reflux valve is kept closed.
Working process or working principle:
the base is communicated with an internal catheter connected with a human body, and the shell is connected with an infusion apparatus.
During normal transfusion:
the upper shell is connected with an infusion apparatus, and the base is communicated with an in-vivo catheter. When the first cavity pressure is greater than the second cavity pressure difference delta P1, the first cavity pressure is the infusion pressure; the second cavity pressure is the blood pressure difference delta P1 of the internal catheter; the anti-reflux valve expands outwards at the cutting joint, the cutting joint is opened towards the direction of the internal catheter, and liquid flows from the first cavity to the second cavity, so that the liquid flows from the infusion apparatus to the internal catheter through the upper shell and the base.
When a blood sample is collected:
the upper shell is connected with an injector, and the base is communicated with an internal catheter. When the injector is used for extracting a blood sample, the pressure of the second cavity is the blood pressure of the internal catheter, the pressure of the first cavity is the back-pumping negative pressure of the injector, and when the pressure of the second cavity is greater than the pressure difference delta P2 of the first cavity, the bottom cutting seam of the anti-reflux valve is sunken and opened towards the direction of the injector, blood flows towards the direction of the first cavity from the second cavity, and the blood sample is successfully collected.
Treatment intermission period:
during the intermittent treatment period, no transfusion or blood sample collection is carried out, namely the upper shell is not connected with an infusion device, the pressure of the second cavity is greater than the pressure difference of the first cavity and less than delta P2, and the arc-shaped anti-reflux valve can be opened only by the pressure greater than delta P2 at the bottom, so that during the intermittent treatment period, the cutting joint of the anti-reflux valve is kept in a closed state, and the liquid of the second cavity and the catheter in the body is in a static state.
Preferably, the bottom of the valve is concave downwards to form a transition arc shape, and the bottom of the valve is concave from the upper shell to the base. The bottom of the valve may be set to a smooth transition arc shape, and the bottom of the valve may be set to a hemispherical shape, an ellipsoidal shape, or other smooth transition arc shape.
Preferably, Δ P1 is less than the pressure of gravity infusion, Δ P1 range: 0-10kPa; Δ P2 is greater than the human blood pressure limit, Δ P2 range: 30-50kPa.
Preferably, the boss is provided to an outer surface or an inner surface of the bottom of the valve for preventing reverse-flow.
Preferably, the outer edge of the step is provided with a projection downwards and provided with a mounting platform.
Preferably, the valve for preventing reverse-flow is integrally formed.
Preferably, the base comprises a supporting table, a clamping table is arranged on the supporting table along the circumferential direction of the inner circle, and an anti-reflux cavity matched with the anti-reflux valve is formed in the clamping table and the supporting table;
the shell comprises a connecting table, the connecting table is in contact connection with the supporting table and is in fit connection with the clamping table, and a shell cavity is formed in the connecting table;
the bottom of the cavity of the shell is provided with a through hole in a shrinkage way towards the center.
Preferably, an external thread connector is arranged at the top of the connecting platform of the shell, and a luer cone internal cone connector is arranged in the external thread connector; the external thread connector and the inner cone connector of the luer cone are used for connecting the infusion device;
the bottom of the base is provided with a conduit connector; the catheter connector is used for connecting a catheter in the body;
the inner cone joint of the luer cone, the shell cavity, the anti-reflux cavity and the catheter connector are communicated to form a cavity formed in the shell and the base;
the supporting table and the connecting table are correspondingly connected in an adaptive mode, the supporting table and the connecting table are correspondingly provided with a positioning column and a positioning groove which are mutually adaptive, and the positioning column and the positioning groove are convenient to position and assemble.
Preferably, the outer portion of the base is provided with a butterfly wing, and the butterfly wing is convenient to operate.
Preferably, the housing is integrally formed; the base is integrally formed.
Compared with the prior art, the beneficial effects of the utility model are that:
1. the utility model discloses a set up the casing, prevent counter-current valve and base, prevent that the cavity of counter-current valve in with casing and base separates into two parts, it realizes intercommunication and closing between casing and the base to be equipped with the joint-cutting through the bottom at the counter-current valve of preventing, thereby realize, from casing to base liquid forward flow, realize normal infusion, realize blood reverse flow through the pumpback equipment, realize blood pumpback, when not infusing or pumpback, prevent that the counter-current valve from closing, play the effect of the internal and external pressure of balanced connector, in order to avoid when infusion utensil and connecting piece are separated in the infusion end, prevent to produce the blood backward flow in the pipe body, cause stifled pipe, high durability and convenient use, wide application range, the sexual valence relative altitude.
2. Through setting up the boss, can strengthen the intensity that the bottom joint-cutting of preventing the counter-current valve corresponds, strengthen the controllability of joint-cutting open and closed state, ensure to prevent blood backward flow to guarantee the normal clear of infusion and blood pumpback.
3. Through setting up casing cavity and opening, through setting up a supporting bench and connecting the platform, through setting up reference column and constant head tank, through setting up step and assembly body, can realize the casing well, the assembly of preventing the valve against reverse flow and base is sealed, prevents that the valve against reverse flow can accomplish the separation and the intercommunication between casing and the base, through the pressure differential of adjusting first cavity pressure and second cavity, realizes opening and closing the problem of solving the blood backward flow of joint-cutting.
4. The infusion apparatus is conveniently connected by arranging the external thread connector and the internal cone connector of the luer cone; through setting up the pipe connector, conveniently connect internal pipe.
Drawings
FIG. 1: the three-dimensional explosion structure of the embodiment 1 of the utility model is schematically shown,
FIG. 2 is a schematic diagram: embodiment 1 of the utility model is a schematic sectional structure,
FIG. 3: the cross-sectional structure A-A in figure 2 is schematic,
FIG. 4: the cross-sectional structure of the anti-reflux valve is schematic,
FIG. 5: the cross-sectional structure of B-B in figure 4 is schematic,
FIG. 6: a schematic three-dimensional structure diagram of the anti-reflux valve,
FIG. 7: the sectional structural schematic diagram of the shell body,
FIG. 8: the schematic view of the three-dimensional structure of the shell,
FIG. 9: the cross-sectional structure of the base is schematic,
FIG. 10: the cross-sectional structure of C-C in FIG. 9 is schematically shown,
FIG. 11: the base is a three-dimensional structure schematic diagram.
In the figure: 1. a housing; 2. an anti-reflux valve; 3. a base;
11. a luer taper inner taper joint; 12. an external thread connector; 13. a flow-through hole; 14. a connecting table; 15. a positioning column; 16. A housing cavity;
21. a step; 22. cutting a seam; 23. a boss; 24. an assembly table;
31. a support table; 32. positioning a groove; 33. clamping a platform; 34. a backflow prevention cavity; 35. a conduit connector; 36. a butterfly wing.
Detailed Description
Example 1
As shown in fig. 1 to 11, the device for preventing catheter from returning blood of the present invention comprises a casing 1 and a base 3, which are sleeved with each other, wherein communicated cavities are formed in the casing 1 and the base 3;
the cavity is internally provided with the anti-reflux valve 2, the anti-reflux valve 2 is of a hemispherical thin-wall structure, the top end of the anti-reflux valve 2 extends outwards to form a step 21, and the outer edge of the step 21 is downwards provided with a bulge which is provided with an assembly table 24. The step 21 is used for being assembled and connected with the shell 1 and the base 3; the bottom of the anti-reflux valve 2 is provided with a cutting seam 22; the bottom of the anti-reflux valve 2 is provided with a boss 23, and the boss 23 and the cutting seam 22 are arranged in a crossed manner;
the boss improves the strength of the cutting seam at the bottom of the valve 2, and the opening and closing of the cutting seam at the bottom of the valve have better controllability. The boss may be provided on the bottom outer or inner surface of the valve for preventing reverse-flow. The valve for preventing reverse-flow may be formed integrally and may be made of elastic material.
The cavity is divided into two parts by the anti-reflux valve 2, and the anti-reflux valve 2 is used for controlling the flowing direction of liquid in the guide pipe.
Wherein:
the cavity is divided into a first cavity and a second cavity from the shell to the base by the anti-reflux valve;
when the pressure difference that the first cavity pressure is larger than the second cavity pressure is larger than delta P1, the cutting seam of the anti-reflux valve expands outwards, the cutting seam opens towards the second cavity, and liquid flows from the first cavity to the second cavity;
when the pressure difference that the first cavity pressure is greater than the second cavity pressure is less than delta P1, the cutting seam of the anti-reflux valve is kept closed;
when the pressure difference that the pressure of the first cavity is smaller than that of the second cavity is larger than delta P2, the cutting joint of the anti-reflux valve is concave inwards, the cutting joint is opened towards the first cavity, and liquid flows from the second cavity to the first cavity;
when the pressure difference that the first cavity pressure is smaller than the second cavity pressure is smaller than delta P2, the cutting seam of the anti-reflux valve is kept closed.
The bottom of the anti-reflux valve 2 is concave downwards to form a transition arc shape, and the bottom of the anti-reflux valve 2 is concave inwards from the upper shell 1 to the base 3. The bottom of the valve for preventing reverse-flow 2 may be set to a smooth transition arc shape, and the bottom of the valve for preventing reverse-flow 2 may be set to a hemispherical shape or an ellipsoidal shape or other smooth transition arc shape.
Δ P1 is less than the pressure of gravity infusion, Δ P1 range: 0-10kPa; Δ P2 is greater than the human blood pressure limit, Δ P2 range: 30-50kPa.
The base 3 comprises a supporting platform 31, a clamping platform 33 is arranged upwards along the inner circumference of the supporting platform 31, and an anti-reflux cavity 34 matched with the anti-reflux valve 2 is arranged in the clamping platform 33 and the supporting platform 31;
the shell 1 comprises a connecting table 14, the connecting table 14 is in contact connection with a supporting table 31, the connecting table 14 is in fit connection with a clamping table 33, and a shell cavity 16 is formed in the connecting table 14;
the bottom of the housing cavity 16 is provided with a flow hole 13 which is shrunk towards the center.
The top of a connecting platform 14 of the shell 1 is provided with an external thread connector 12, and a luer cone internal cone connector 11 is arranged in the external thread connector 12; the external thread connector 12 and the luer cone internal cone connector 11 are used for connecting an infusion device;
the bottom of the base 3 is provided with a conduit connector 35; the catheter connector 35 is used for connecting a catheter in the body;
the inner cone joint 11 of the luer cone, the shell cavity 16, the anti-reflux cavity 34 and the conduit connector 35 are communicated to form cavities arranged in the shell 1 and the base 3;
the supporting table 31 and the connecting table 14 are correspondingly matched and connected, and the supporting table 31 and the connecting table 14 are correspondingly provided with a positioning column 15 and a positioning groove 32 which are matched with each other.
The outer part of the base 3 is provided with a butterfly wing 36.
The base may be integrally formed and the housing may be integrally formed.
The magnitude of Δ P1 can be controlled by adjusting the width of the slits and the strength of the elastic material.
The magnitude of Δ P2 can be controlled by adjusting the kerf width, the thickness and width of the ribs, and the strength of the elastomeric material. The shell and the base can be made of medical plastics.
The material of the valve for preventing reverse-flow can be elastic material, such as silica gel.
Working process or working principle:
as shown in fig. 2-3, the male connector 12 and the female luer taper connector 11 of the housing are connected to an infusion set.
1. Normal transfusion:
the upper shell is connected with an infusion apparatus, and the base is communicated with an in-vivo catheter. When the first cavity pressure is greater than the second cavity pressure difference delta P1, the first cavity pressure is infusion pressure, and the second cavity pressure is internal catheter blood pressure difference delta P1; the anti-reflux valve expands outwards at the cutting joint, the cutting joint is opened towards the direction of the internal catheter, and liquid flows from the first cavity to the second cavity, so that the liquid flows from the infusion apparatus to the internal catheter through the upper shell and the base.
2. When a blood sample is collected:
the upper shell is connected with an injector, and the base is communicated with an internal catheter. When the syringe is used for drawing a blood sample, the pressure of the second cavity is the blood pressure of the internal catheter, the pressure of the first cavity is the negative pressure of the syringe during the back-pumping, and when the pressure of the second cavity is greater than the pressure difference delta P2 of the first cavity, the bottom cut of the anti-reflux valve is opened towards the syringe in a concave mode, blood flows from the second cavity to the first cavity, and the blood sample is collected successfully.
3. Treatment intermission period:
during the intermittent treatment period, no transfusion or blood sample collection is carried out, namely the upper shell is not connected with a transfusion device, the pressure of the second cavity is greater than that of the first cavity and is less than delta P2, and the bottom of the arc-shaped anti-reflux valve can be opened only by the pressure greater than delta P2, so that during the intermittent treatment period, the cutting seam of the anti-reflux valve is kept closed, and the liquid of the second cavity and the body catheter is in a static state.
The utility model discloses in to the direction of structure and the description of relative position relation, it is right not to constitute like the description from top to bottom all around the utility model discloses a restriction only is the description convenient.
Claims (10)
1. The device for preventing the catheter from returning blood is characterized by comprising a shell (1) and a base (3) which are mutually sleeved, wherein communicated cavities are formed in the shell (1) and the base (3);
the anti-reflux valve (2) is arranged in the cavity, the anti-reflux valve (2) is of a thin-wall structure, the top end of the anti-reflux valve (2) extends outwards to form a step (21), and the step (21) is used for being assembled and connected with the shell (1) and the base (3); the bottom of the anti-reflux valve (2) is provided with a cutting seam (22); the bottom of the anti-reflux valve (2) is provided with a boss (23), and the boss (23) and the cutting seam (22) are arranged in a cross way;
the cavity is divided into two parts by the anti-reflux valve (2), and the anti-reflux valve (2) is used for controlling the flowing direction of liquid in the guide pipe.
2. The catheter blood return prevention device according to claim 1, wherein the anti-reflux valve (2) partitions the cavity from the upper case (1) to the base (3) into a first cavity and a second cavity;
when the pressure difference that the first cavity pressure is larger than the second cavity pressure is larger than delta P1, the cutting seam of the anti-reflux valve (2) expands outwards, the cutting seam opens towards the second cavity, and liquid flows from the first cavity to the second cavity;
when the pressure difference that the first cavity pressure is larger than the second cavity pressure is smaller than delta P1, the cutting seam of the anti-reflux valve (2) is kept closed;
when the pressure difference that the first cavity pressure is smaller than the second cavity pressure is larger than delta P2, the cutting joint of the anti-reflux valve (2) is concave, the cutting joint is opened towards the first cavity, and liquid flows from the second cavity to the first cavity;
when the pressure difference that the first cavity pressure is smaller than the second cavity pressure is smaller than delta P2, the cutting seam of the anti-reflux valve (2) is kept closed.
3. The catheter blood return prevention device according to claim 2, wherein the bottom of the valve (2) is recessed downward to form a transition arc, and the bottom of the valve (2) is recessed from the upper housing (1) to the base (3).
4. The catheter blood return prevention device of claim 3, wherein Δ P1 is less than the pressure of gravity infusion, Δ P1 range: 0-10kPa;
Δ P2 is greater than the human blood pressure limit, Δ P2 range: 30-50kPa.
5. The catheter blood return prevention device according to claim 1, wherein the boss (23) is provided on an outer surface or an inner surface of the bottom of the valve (2); the outer edge of the step (21) is provided with a projection downwards and is provided with an assembly platform (24).
6. The catheter blood return prevention device according to any one of claims 1 to 5, wherein the valve for preventing reverse-flow (2) is integrally formed.
7. The device for preventing catheter blood return according to any one of claims 1-5, wherein the base (3) comprises a support platform (31), the support platform (31) is provided with a clamping platform (33) along the inner circumference, and the clamping platform (33) and the support platform (31) are internally provided with an anti-reflux cavity (34) matched with the anti-reflux valve (2);
the shell (1) comprises a connecting table (14), the connecting table (14) is in contact connection with the supporting table (31), the connecting table (14) is in matched connection with the clamping table (33), and a shell cavity (16) is formed in the connecting table (14);
the bottom of the shell cavity (16) is provided with a circulating hole (13) in a shrinking way towards the center.
8. The device for preventing the catheter from returning blood as claimed in claim 7, wherein the top of the connecting platform (14) of the shell (1) is provided with an external threaded connector (12), and a luer taper internal conical connector (11) is arranged in the external threaded connector (12); the external thread connector (12) and the internal cone connector (11) of the luer cone are used for connecting the infusion device;
the bottom of the base (3) is provided with a conduit connector (35); the catheter connector (35) is used for connecting a catheter in the body;
the inner parts of the luer cone inner cone joint (11), the shell cavity (16), the anti-reflux cavity (34) and the conduit connector (35) are communicated to form cavities arranged in the shell (1) and the base (3);
the supporting table (31) and the connecting table (14) are correspondingly and adaptively connected, and the supporting table (31) and the connecting table (14) are correspondingly provided with a positioning column (15) and a positioning groove (32) which are mutually adaptive.
9. The device for preventing catheter flashback according to claim 8, characterized in that the base (3) is externally provided with wings (36).
10. The catheter blood return prevention device according to claim 8, wherein the housing (1) is integrally formed; the base (3) is integrally formed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220771679.4U CN217772911U (en) | 2022-04-01 | 2022-04-01 | Device for preventing catheter from returning blood |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220771679.4U CN217772911U (en) | 2022-04-01 | 2022-04-01 | Device for preventing catheter from returning blood |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217772911U true CN217772911U (en) | 2022-11-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220771679.4U Active CN217772911U (en) | 2022-04-01 | 2022-04-01 | Device for preventing catheter from returning blood |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217772911U (en) |
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2022
- 2022-04-01 CN CN202220771679.4U patent/CN217772911U/en active Active
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