CN114748785B - Device for preventing catheter from back-bleeding - Google Patents
Device for preventing catheter from back-bleeding Download PDFInfo
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- CN114748785B CN114748785B CN202210348225.0A CN202210348225A CN114748785B CN 114748785 B CN114748785 B CN 114748785B CN 202210348225 A CN202210348225 A CN 202210348225A CN 114748785 B CN114748785 B CN 114748785B
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M39/00—Tubes, tube connectors, tube couplings, valves, access sites or the like, specially adapted for medical use
- A61M39/10—Tube connectors; Tube couplings
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/15—Devices for taking samples of blood
- A61B5/150007—Details
- A61B5/150015—Source of blood
- A61B5/15003—Source of blood for venous or arterial blood
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/15—Devices for taking samples of blood
- A61B5/150007—Details
- A61B5/150206—Construction or design features not otherwise provided for; manufacturing or production; packages; sterilisation of piercing element, piercing device or sampling device
- A61B5/150221—Valves
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M39/00—Tubes, tube connectors, tube couplings, valves, access sites or the like, specially adapted for medical use
- A61M39/22—Valves or arrangement of valves
- A61M39/26—Valves closing automatically on disconnecting the line and opening on reconnection thereof
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
- A61M5/14—Infusion devices, e.g. infusing by gravity; Blood infusion; Accessories therefor
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
- A61M5/14—Infusion devices, e.g. infusing by gravity; Blood infusion; Accessories therefor
- A61M2005/1401—Functional features
- A61M2005/1406—Minimizing backflow along the delivery catheter track
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M39/00—Tubes, tube connectors, tube couplings, valves, access sites or the like, specially adapted for medical use
- A61M39/10—Tube connectors; Tube couplings
- A61M2039/1061—Break-apart tubing connectors or couplings
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/30—Against vector-borne diseases, e.g. mosquito-borne, fly-borne, tick-borne or waterborne diseases whose impact is exacerbated by climate change
Abstract
The invention relates to a device for preventing blood return of a catheter, belonging to the technical field of medical appliances; comprises an upper shell and a base which are mutually sleeved, wherein the upper shell and the base are internally provided with communicated cavities; the cavity is internally provided with an anti-reflux valve, the outer diameter of the anti-reflux valve is matched with the inner wall of the cavity, the cavity is divided into two parts by the anti-reflux valve, and the bottom of the anti-reflux valve is provided with a cutting slot; the anti-backflow valve comprises an anti-backflow valve cylinder which is of a thin-wall cylindrical structure, the bottom of the anti-backflow valve cylinder is provided with an anti-backflow valve bottom, and the bottom of the anti-backflow valve bottom is provided with a cutting seam; the anti-backflow valve cylinder is sleeved with a separation cylinder, and the side surface of the separation cylinder is provided with a deformation hole. The invention can effectively prevent the backflow of blood in the tube body after the transfusion is finished, and has the advantages of tube blockage, convenient use, wide application range and high cost performance.
Description
Technical Field
The invention relates to a device for preventing blood return of a catheter, and belongs to the technical field of medical appliances.
Background
Catheters are a medical device that establishes an important pathway between the outside and blood circulation in the body, and various drugs, including blood products, and blood, can be infused into the blood circulation by veins for therapeutic purposes. Catheters generally comprise a number of categories: such as peripheral intravenous catheters, also known medically as PVC; central venous catheters, also known as CVCs, in medicine; peripherally inserted into a central catheter, also known as a PICC; the PORT of infusion, also known as PORT, is medical.
Catheters are typically composed of an intra-body tube and an extra-body connector. The connector is used for connecting an infusion device outside the body. When the infusion apparatus and the connecting piece are separated after the infusion, blood reflux usually occurs in the tube body, and the current measures for preventing the blood reflux have the following technical defects:
to prevent blood flashback, i.e., to prevent back flow, medical personnel are required to use positive pressure sealing tubing. The positive pressure tube sealing has higher operation technical requirements on medical staff, continuous skilled operation is required, once operation is delayed or misoperation occurs, blood in the tube body flows backwards easily, the tube is blocked by coagulation, the treatment effect is affected, the emotion of a patient is not safe, and even the tube needs to be replaced, so that unnecessary pain is caused to the patient.
Disclosure of Invention
The invention overcomes the defects of the prior art, and provides the device for preventing the blood return of the catheter, which can effectively prevent the backflow of blood in the catheter after the transfusion is finished, thus the catheter is blocked, and the device is convenient to use, wide in application range and high in cost performance.
The invention relates to a device for preventing blood return of a catheter, which comprises an upper shell and a base which are mutually sleeved, wherein a communicated cavity is formed in the upper shell and the base;
the cavity is internally provided with an anti-reflux valve, the outer diameter of the anti-reflux valve is matched with the inner wall of the cavity, the cavity is divided into two parts by the anti-reflux valve, and the bottom of the anti-reflux valve is provided with a cutting slot;
the anti-backflow valve comprises an anti-backflow valve cylinder which is of a thin-wall cylindrical structure, the bottom of the anti-backflow valve cylinder is provided with an anti-backflow valve bottom, and the bottom of the anti-backflow valve bottom is provided with a cutting seam;
the anti-backflow valve cylinder is sleeved with a separation cylinder, and the side surface of the separation cylinder is provided with a deformation hole.
Preferably, the anti-reflux valve separates the cavity from the upper housing to the base into a first cavity and a second cavity;
when the pressure difference of the first cavity pressure is larger than the pressure difference of the second cavity pressure and is larger than delta P1, the joint of the anti-backflow valve expands outwards, the joint opens to the second cavity, and liquid flows from the first cavity to the second cavity;
when the pressure difference between the first cavity pressure and the second cavity pressure is smaller than delta P1, the kerf of the anti-reflux valve is kept closed;
when the pressure difference of the first cavity pressure is smaller than that of the second cavity pressure and is larger than delta P2, the joint of the anti-backflow valve is concave, the joint opens to the first cavity, and liquid flows from the second cavity to the first cavity;
when the pressure difference between the first cavity pressure and the second cavity pressure is smaller than delta P2, the joint of the anti-backflow valve is kept closed.
Working process or working principle:
the base is communicated with an internal catheter connected with a human body, and the upper shell is connected with an infusion device.
During normal transfusion:
the upper shell is connected with an infusion device, and the base is communicated with the internal catheter. When the first cavity pressure is larger than the second cavity pressure difference delta P1, the first cavity pressure is the infusion pressure; the second cavity pressure is the in-vivo catheter blood pressure difference delta P1; the anti-reflux valve expands outwards at the joint seam and causes the joint seam to be 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 blood samples are collected:
the upper shell is connected with the injector, and the base is communicated with the internal catheter. When the syringe is used for drawing a blood sample, the pressure of the second cavity is the blood pressure of the in-vivo catheter, the pressure of the first cavity is the negative pressure of the syringe, when the pressure of the second cavity is greater than the pressure difference delta P2 of the first cavity, the slit at the bottom of the anti-reflux valve is sunken and opened towards the direction of the syringe, and the blood flows from the second cavity to the direction of the first cavity, so that the blood sample is successfully collected.
When the infusion set is withdrawn:
when the infusion or blood sample collection is completed, the upper shell body withdraws from the infusion device, the first cavity body can generate vacuum capacity, at the moment, the upper thin wall of the anti-reflux valve is deformed towards the concave part in the deformation hole of the separation cylinder and is used for compensating the vacuum capacity generated when the infusion device is withdrawn, the bottom of the anti-reflux valve is not deformed, the lancing of the anti-reflux valve is kept closed, the second cavity body and the liquid in the internal catheter are in a static state, so that the internal catheter is prevented from generating blood reflux, the tube blockage is caused, the use is convenient, the application range is wide, and the cost performance is high.
Treatment intermittence period:
in the treatment intermittent period, transfusion is not carried out or blood samples are collected, namely the upper shell is not connected with an infusion device, the pressure of the second cavity is larger than that of the first cavity, the pressure difference of the second cavity is smaller than that of the delta P2, and the arc-shaped anti-reflux valve bottom can be opened only by the pressure larger than that of the delta P2, so that in the treatment intermittent period, the slit of the anti-reflux valve is kept in a closed state, and the second cavity and catheter liquid in the body are in a static state.
Preferably, the anti-backflow valve bottom is concavely arranged in a transitional arc shape downwards, and the anti-backflow valve cylinder and the anti-backflow valve bottom are arranged from the upper shell to the base.
Preferably, after transfusion or blood sample collection is completed, when the upper shell is withdrawn from the transfusion device, the first cavity generates vacuum capacity, and the thin wall of the anti-reflux valve cylinder is deformed towards the concave part in the deformation hole of the separation cylinder, so as to compensate the vacuum capacity generated when the transfusion device is withdrawn; the bottom of the anti-backflow valve is not deformed, and the kerf of the anti-backflow valve is kept closed; the second cavity and the liquid in the internal catheter are in a static state, so that the internal catheter is prevented from generating blood reflux to cause the blockage of the catheter.
Preferably, the vacuum capacity compensation range upon withdrawal of the infusion set: 0-0.1mL;
Δp1 is less than the pressure of gravity infusion, Δp1 range: 0-10kPa; Δp2 is greater than the human blood pressure limit, Δp2 range: 30-50kPa.
Preferably, the outer wall of the top end of the anti-backflow valve bottom is outwards provided with a sealing table in a protruding mode, the sealing table is used for sealing a gap between the outer wall of the anti-backflow valve and the inner wall of the cavity, the sealing table ensures sealing between the anti-backflow valve and the inner wall of the cavity, and the upper shell is communicated with the base only through a cutting joint of the anti-backflow valve; opening the cutting joint during transfusion to realize forward flow of liquid; when preventing blood return, the incision is ensured to be in a closed state.
Preferably, the sealing platform of the anti-reflux valve bottom extends downwards to the whole anti-reflux valve bottom; the thickness of the bottom wall of the anti-backflow valve is larger than that of the anti-backflow valve cylinder; the anti-backflow valve cylinder is easier to deform relative to the anti-backflow valve bottom, after the anti-backflow valve cylinder deforms, the anti-backflow valve is closed, the kerf of the anti-backflow valve bottom is not deformed any more, namely, the kerf is not outwards opened, the indent is not generated, the anti-backflow valve is closed, the communication between the upper shell and the base is blocked, namely, the communication between the catheter and the infusion device is blocked, and blood backflow is prevented.
Preferably, the bottom of the anti-reflux valve bottom is provided with a reinforcing rib which is arranged in a crossing way with the cutting seam; the strength of the kerf of the anti-backflow valve bottom is improved, and the kerf of the anti-backflow valve bottom is opened and closed with better controllability.
Preferably, the reinforcing ribs are provided on the outer surface or the inner surface of the valve bottom for preventing reverse flow.
Preferably, the base comprises a supporting table, a limiting cylinder is arranged on the supporting table along the inner circumference, and an anti-backflow cavity matched with the anti-backflow valve is arranged in the limiting cylinder and the supporting table;
the upper shell comprises a connecting table, the connecting table is in contact connection with the supporting table, the connecting table is in matched connection with the limiting cylinder, and a cavity of the upper shell is formed in the connecting table;
the top of the anti-backflow valve cylinder is outwards provided with a valve plate limiting table;
a separation limit table is arranged outwards at the top of the separation cylinder;
the separation limiting table, the valve plate limiting table and the limiting cylinder are sequentially clamped from top to bottom;
the separation limit table, the valve plate limit table and the limit cylinder are arranged in a matched manner with the cavity of the upper shell; the outer wall of the limiting cylinder is arranged in a matched mode with the inner wall of the connecting table.
Preferably, the upper shell cavity is provided with three layers of step cavities; a clamping table is arranged at the middle part of the limiting cylinder in an outward protruding way; the three-layer step cavity is respectively arranged corresponding to the separation limiting table, the valve plate limiting table and the clamping table; and the device is used for limiting and supporting the separation cylinder and the anti-backflow valve.
Preferably, the top of the connecting table of the upper shell is provided with an external thread connector, and a luer taper inner cone connector is arranged in the external thread connector; the external thread connector and the luer taper inner conical connector are used for connecting an infusion device;
the bottom of the base is provided with a conduit connector; the catheter connector is used for connecting an in-vivo catheter;
the inner cone joint of the luer cone, the cavity of the upper shell, the anti-backflow cavity and the inside of the conduit connector are communicated to form a cavity formed in the upper shell and the base;
the supporting table and the connecting table are correspondingly connected in a matched mode, and positioning columns and positioning grooves which are mutually matched are correspondingly arranged on the supporting table and the connecting table.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the invention, the upper shell, the separation barrel, the anti-reflux valve and the base are arranged, the inner cavities of the upper shell and the base are separated into two parts by the anti-reflux valve, and the upper shell and the base are communicated and closed by the aid of the slit arranged at the bottom of the anti-reflux valve, so that normal liquid flow of the upper shell to the base is realized, normal liquid transfusion is realized, liquid reverse flow is realized by the aid of the back-pumping equipment, liquid reflux is realized, when liquid transfusion is not carried out or the back-pumping is not carried out, the anti-reflux valve is closed, the effect of balancing the internal and external pressure of a connection body is achieved, and the phenomenon that the blood in the tube body flows back to cause tube blockage is avoided when the infusion apparatus and the connection piece are separated after the transfusion is finished is avoided.
2. By arranging the anti-backflow valve cylinder and the sealing table, the sealing table ensures the sealing between the anti-backflow valve cylinder and the upper shell and the base, ensures the communication between the upper shell and the base through the cutting joint, and realizes the communication and blocking between the upper shell and the base through the opening and closing of the cutting joint, thereby realizing the backflow of transfusion and liquid and preventing the backflow of blood.
3. Through setting up the strengthening rib, can strengthen the intensity that the anti-reflux valve undercut seam corresponds, strengthen the controllability of kerf open and closed state, ensure can prevent blood backward flow to guarantee infusion and the normal clear of liquid backward flow.
4. Through setting up three-layer step cavity as last casing cavity, can be well with the block platform of spacing section of thick bamboo, valve block spacing platform and separate spacing platform looks adaptation arrangement, through setting up sealed platform, go up casing, separate section of thick bamboo, prevent reverse flow valve and base and adapt each other well and seal, prevent reverse flow valve can accomplish the separation and the intercommunication between casing and the base, through adjusting the pressure of first cavity pressure and second cavity, open and close through the pressure difference between the two, realize the opening and closing of joint-cutting, through the vacuum of first cavity or second cavity, take place deformation through deformation hole through preventing reverse flow valve section of thick bamboo, supplementary joint-cutting closes, solve the problem of blood backward flow.
5. The infusion appliance is conveniently connected by arranging the external thread connector and the luer taper inner cone connector; through setting up the pipe connector, the internal pipe of convenient connection.
Drawings
Fig. 1: a schematic diagram of a three-dimensional exploded structure of embodiment 1 of the present invention,
fig. 2: embodiment 1 of the present invention is a schematic cross-sectional structure,
fig. 3: in figure 2 A-A is a schematic cross-sectional view,
fig. 4: the three-dimensional structure of the upper shell is schematically shown,
fig. 5: the cross-sectional structure of the upper shell is schematically shown,
fig. 6: the three-dimensional structure of the base is schematically shown,
fig. 7: the cross-section structure of the base is schematically shown,
fig. 8: the cross-sectional structure of the anti-backflow valve is schematically shown,
fig. 9: the schematic view of the cross-sectional structure of B-B in figure 8,
fig. 10: a three-dimensional structure schematic diagram of the anti-backflow valve,
fig. 11: a schematic diagram of the three-dimensional structure of the separation cylinder,
fig. 12: the sectional structure of the separation cylinder is schematically shown,
fig. 13: FIG. 12 is a schematic view of the structure of section C-C.
In the figure: 1. an upper housing; 2. a separation cylinder; 3. an anti-reflux valve; 4. a base;
11. a luer taper inner conical joint; 12. an external thread connector; 13. an upper housing cavity; 14. positioning columns; 15. a connection station;
21. separating the limit tables; 22. a deformation hole;
31. valve plate limiting table; 32. an anti-reflux valve cylinder; 33. a sealing table; 34. an anti-reflux valve bottom; 35. cutting; 36. reinforcing ribs;
41. a support table; 42. a positioning groove; 43. a limiting cylinder; 44. an anti-reflux cavity; 45. a conduit connector; 46. a clamping table.
Detailed Description
Example 1
As shown in fig. 1 to 13, the device for preventing blood return of a catheter according to the present invention comprises an upper casing 1 and a base 4 that are mutually sleeved, wherein a communicating cavity is formed in the upper casing 1 and the base 4;
the cavity is internally provided with an anti-reflux valve 3, the outer diameter of the anti-reflux valve 3 is matched with the inner wall of the cavity, the anti-reflux valve 3 divides the cavity into two parts, and the bottom of the anti-reflux valve 3 is provided with a cutting joint 35;
the anti-backflow valve 3 comprises an anti-backflow valve cylinder 32, the anti-backflow valve cylinder 32 is of a thin-wall cylindrical structure, an anti-backflow valve bottom 34 is arranged at the bottom of the anti-backflow valve cylinder 32, and a cutting slit 35 is arranged at the bottom of the anti-backflow valve bottom 34; the anti-reflux valve 3 can be integrally formed;
the separation cylinder 2 is sleeved in the anti-backflow valve cylinder 32, and deformation holes 22 are formed in the side face of the separation cylinder 2.
The anti-backflow valve divides the cavity into a first cavity and a second cavity from the upper shell to the base;
when the pressure difference of the first cavity pressure is larger than the pressure difference of the second cavity pressure and is larger than delta P1, the joint of the anti-backflow valve expands outwards, the joint opens to the second cavity, and liquid flows from the first cavity to the second cavity;
when the pressure difference between the first cavity pressure and the second cavity pressure is smaller than delta P1, the kerf of the anti-reflux valve is kept closed;
when the pressure difference of the first cavity pressure is smaller than that of the second cavity pressure and is larger than delta P2, the joint of the anti-backflow valve is concave, the joint opens to the first cavity, and liquid flows from the second cavity to the first cavity;
when the pressure difference between the first cavity pressure and the second cavity pressure is smaller than delta P2, the joint of the anti-backflow valve is kept closed.
The reverse flow prevention valve bottom 34 is concavely formed in a transitional arc shape, and the reverse flow prevention valve cylinder 32 and the reverse flow prevention valve bottom 34 are arranged from the upper shell 1 to the base 4. The anti-reflux valve bottom 34 can be configured as a smooth transition arc, and the anti-reflux valve bottom 34 can be configured as a hemispherical or ellipsoidal or other smooth transition arc.
When the upper shell is withdrawn from the infusion device after the transfusion or blood sample collection is completed, the first cavity generates vacuum capacity, and the thin wall of the anti-reflux valve cylinder 32 is concaved into the deformation hole 22 of the separation cylinder to deform so as to compensate the vacuum capacity generated when the infusion device is withdrawn; the bottom of the anti-backflow valve is not deformed, and the kerf of the anti-backflow valve is kept closed; the second cavity and the liquid in the internal catheter are in a static state, so that the internal catheter is prevented from generating blood backflow, the catheter is blocked, the use is convenient, the application range is wide, and the cost performance is high.
Vacuum capacity compensation range: 0-0.1mL.
Δp1 is less than the pressure of gravity infusion, Δp1 range: 0-10kPa; Δp2 is greater than the human blood pressure limit, Δp2 range: 30-50kPa.
The outer wall of the top end of the anti-backflow valve bottom 34 is outwards protruded and provided with a sealing table 33, and the sealing table 33 is used for sealing a gap between the outer wall of the anti-backflow valve 3 and the inner wall of the cavity; the sealing table ensures the sealing between the anti-backflow valve and the inner wall of the cavity, and the upper shell is communicated with the base only through the cutting joint of the anti-backflow valve; opening the cutting joint during transfusion to realize forward flow of liquid; when preventing blood return, the incision is ensured to be in a closed state.
The sealing table 33 of the reverse flow preventing valve bottom 34 extends downward to the entire reverse flow preventing valve bottom 34; the wall thickness of the anti-reflux valve bottom 34 is larger than that of the anti-reflux valve cylinder 32; the anti-backflow valve cylinder is easier to deform relative to the anti-backflow valve bottom, after the anti-backflow valve cylinder deforms, the anti-backflow valve is closed, the kerf of the anti-backflow valve bottom is not deformed any more, namely, the kerf is not outwards opened, the indent is not generated, the anti-backflow valve is closed, the communication between the upper shell and the base is blocked, namely, the communication between the catheter and the infusion device is blocked, and blood backflow is prevented.
As shown in fig. 8-10, the bottom of the backflow prevention valve bottom 34 is provided with a reinforcing rib 36, and the reinforcing rib 36 is arranged in a crossing manner with the cutting slits 35; the strength of the kerf of the anti-backflow valve bottom is improved, and the kerf of the anti-backflow valve bottom is opened and closed with better controllability. The reinforcing ribs 36 may be provided on the outer surface or the inner surface of the reverse flow preventing valve bottom 34. The anti-reflux valve can be integrally formed and made of elastic materials. The base 4 comprises a supporting table 41, a limiting cylinder 43 is arranged on the supporting table 41 along the inner circumference, and an anti-backflow cavity 44 matched with the anti-backflow valve 3 is formed in the limiting cylinder 43 and the supporting table 41.
As shown in fig. 1-5 and 11-13, the upper shell 1 comprises a connecting table 15, the connecting table 15 is in contact connection with a supporting table 41, the connecting table 15 is in matched connection with a limiting cylinder 43, and an upper shell cavity 13 is formed in the connecting table;
the top of the anti-backflow valve cylinder 32 is outwards provided with a valve plate limiting table 31;
a separation limiting table 21 is arranged outwards at the top of the separation cylinder 2;
the separation limiting table 21, the valve plate limiting table 31 and the limiting cylinder 43 are sequentially clamped from top to bottom;
the separation limit table 21, the valve plate limit table 31 and the limit cylinder 43 are arranged in a matched mode with the upper shell cavity 13; the outer wall of the limiting cylinder 43 is matched with the inner wall of the connecting table 15.
The upper shell cavity is a three-layer step cavity; a clamping table 46 is arranged at the middle part of the limiting cylinder 43 in an outward protruding way; the three-layer step cavity is respectively arranged corresponding to the separation limiting table 21, the valve plate limiting table 31 and the clamping table 46; for limiting and supporting the separation cylinder 2 and the anti-reflux valve 3.
The top of a connecting table 15 of the upper shell 1 is provided with an external thread connector 12, and a luer taper inner conical connector 11 is arranged in the external thread connector 12; the external thread connector 12 and the luer taper internal cone connector 11 are used for connecting an infusion device;
as shown in fig. 1-3 and fig. 6-7, the bottom of the base 4 is provided with a conduit connector 45; the catheter connector 45 is used for connecting an internal catheter;
the inner cone joint 11, the upper shell cavity 13, the anti-backflow cavity 44 and the conduit connector 45 are communicated with each other to form cavities arranged in the upper shell 1 and the base 4;
the supporting table 41 and the connecting table 15 are correspondingly and adaptively connected, and the supporting table 41 and the connecting table 15 are correspondingly provided with positioning columns 14 and positioning grooves 42 which are mutually matched.
The base can integrated into one piece, and last casing can integrated into one piece.
The magnitude of Δp1 can be controlled by adjusting the width of the slit and the strength of the elastic material.
The magnitude of Δp2 can be controlled by adjusting the width of the slit, the thickness and width of the reinforcing ribs, and the strength of the elastic material. The upper shell, the base and the separation cylinder can be all made of medical plastic.
The material of the anti-reflux valve can be elastic material, such as silica gel.
Working process or working principle:
the external threaded connector 12 of the upper shell and the luer taper internal conical connector 11 are connected with an infusion device.
1. Normal transfusion:
the upper shell is connected with an infusion device, and the base is communicated with the internal catheter. When the first cavity pressure is larger than the second cavity pressure difference delta P1, the first cavity pressure is infusion pressure, and the second cavity pressure is in-vivo catheter blood pressure difference delta P1; the anti-reflux valve expands outwards at the joint seam and causes the joint seam to be 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 blood samples are collected:
the upper shell is connected with the injector, and the base is communicated with the internal catheter. When the syringe is used for drawing a blood sample, the pressure of the second cavity is the blood pressure of the in-vivo catheter, the pressure of the first cavity is the negative pressure of the syringe, when the pressure of the second cavity is greater than the pressure difference delta P2 of the first cavity, the slit at the bottom of the anti-reflux valve is sunken and opened towards the direction of the syringe, and the blood flows from the second cavity to the direction of the first cavity, so that the blood sample is successfully collected.
3. When the infusion set is withdrawn:
when the infusion or blood sample collection is completed, the upper shell body withdraws from the infusion device, the first cavity body can generate vacuum capacity, at the moment, the thin-wall cylindrical anti-reflux valve cylinder of the anti-reflux valve is concavely deformed into the deformation hole 22 and is used for compensating the vacuum capacity generated when the infusion device is withdrawn, the bottom of the anti-reflux valve is not deformed, the lancing of the anti-reflux valve is kept closed, the second cavity body and the liquid in the internal catheter are in a static state, so that the internal catheter is prevented from generating blood reflux, and the tube blockage is caused.
4. Treatment intermittence period:
in the treatment intermittent period, transfusion is not carried out or blood samples are collected, namely the upper shell is not connected with an infusion device, the pressure of the second cavity is larger than that of the first cavity, the pressure difference of the second cavity is smaller than that of the delta P2, and the arc-shaped anti-reflux valve bottom can be opened only by the pressure larger than that of the delta P2, so that in the treatment intermittent period, the slit of the anti-reflux valve is kept in a closed state, and the second cavity and catheter liquid in the body are in a static state.
The description of the directions and the relative positional relationships of the structures, such as the description of the front, back, left, right, up and down, in the present invention does not limit the present invention, but is merely for convenience of description.
Claims (7)
1. The device for preventing the catheter from returning blood is characterized by comprising an upper shell (1) and a base (4) which are mutually sleeved, wherein a communicated cavity is formed in the upper shell (1) and the base (4);
the cavity is internally provided with an anti-reflux valve (3), the outer diameter of the anti-reflux valve (3) is matched with the inner wall of the cavity, the anti-reflux valve (3) divides the cavity into two parts, and the bottom of the anti-reflux valve (3) is provided with a cutting seam (35);
the anti-reflux valve (3) comprises an anti-reflux valve cylinder (32), the anti-reflux valve cylinder (32) is of a thin-wall cylindrical structure, an anti-reflux valve bottom (34) is arranged at the bottom of the anti-reflux valve cylinder (32), and a cutting slit (35) is arranged at the bottom of the anti-reflux valve bottom (34);
a separation cylinder (2) is sleeved in the anti-backflow valve cylinder (32), and a deformation hole (22) is formed in the side surface of the separation cylinder (2);
the anti-backflow valve divides the cavity into a first cavity and a second cavity from the upper shell to the base;
when the pressure difference of the first cavity pressure is larger than the pressure difference of the second cavity pressure and is larger than delta P1, the joint of the anti-backflow valve expands outwards, the joint opens to the second cavity, and liquid flows from the first cavity to the second cavity;
when the pressure difference between the first cavity pressure and the second cavity pressure is smaller than delta P1, the kerf of the anti-reflux valve is kept closed;
when the pressure difference of the first cavity pressure is smaller than that of the second cavity pressure and is larger than delta P2, the joint of the anti-backflow valve is concave, the joint opens to the first cavity, and liquid flows from the second cavity to the first cavity;
when the pressure difference of the first cavity pressure is smaller than the second cavity pressure and smaller than delta P2, the kerf of the anti-reflux valve is kept closed;
the anti-backflow valve bottom (34) is concavely arranged in a transitional arc shape, and the anti-backflow valve cylinder (32) and the anti-backflow valve bottom (34) are arranged from the upper shell (1) to the base (4);
after transfusion or blood sample collection is completed, when the upper shell is withdrawn from the transfusion device, the first cavity generates vacuum capacity, and the thin wall (32) of the anti-backflow valve cylinder is concaved into the deformation hole (22) of the separation cylinder to deform so as to compensate the vacuum capacity generated when the transfusion device is withdrawn; the anti-backflow valve bottom (34) is not deformed, and the kerf of the anti-backflow valve is kept closed; the second cavity and the liquid in the internal catheter are in a static state, so that the internal catheter is prevented from generating blood reflux to cause the blockage of the catheter.
2. The device for preventing catheter flashback of claim 1, wherein the vacuum volume compensation range when the infusion set is withdrawn: 0-0.1mL;
Δp1 is less than the pressure of gravity infusion, Δp1 range: 0-10kPa;
Δp2 is greater than the human blood pressure limit, Δp2 range: 30-50kPa.
3. Device for preventing back-flow of a catheter according to claim 1 or 2, characterized in that the outer wall of the top end of the back-flow prevention valve bottom (34) is provided with a sealing land (33) protruding outwards, the sealing land (33) being used for sealing the gap between the outer wall of the back-flow prevention valve (3) and the inner wall of the cavity.
4. A device for preventing back-flow of a catheter according to claim 3, characterized in that the sealing land (33) of the anti-reflux valve bottom (34) extends down to the entire anti-reflux valve bottom (34); the wall thickness of the anti-backflow valve bottom (34) is larger than that of the anti-backflow valve cylinder (32).
5. A device for preventing back-flow of a catheter according to claim 3, characterized in that the bottom of the back-flow prevention valve base (34) is provided with a reinforcement rib (36), the reinforcement rib (36) being arranged crosswise to the slit (35).
6. The device for preventing blood return of a catheter according to claim 5, wherein the base (4) comprises a supporting table (41), the supporting table (41) is provided with a limiting cylinder (43) along the inner circumference, and a backflow preventing cavity (44) matched with the backflow preventing valve (3) is formed in the limiting cylinder (43) and the supporting table (41);
the upper shell (1) comprises a connecting table (15), the connecting table (15) is in contact connection with the supporting table (41), the connecting table (15) is in matched connection with the limiting cylinder (43), and an upper shell cavity (13) is formed in the connecting table;
the top of the anti-backflow valve cylinder (32) is outwards provided with a valve plate limiting table (31);
a separation limit table (21) is arranged outwards at the top of the separation cylinder (2);
the separation limiting table (21), the valve plate limiting table (31) and the limiting cylinder (43) are sequentially clamped from top to bottom;
the separation limit table (21), the valve plate limit table (31) and the limit cylinder (43) are arranged in a matched mode with the upper shell cavity (13); the outer wall of the limiting cylinder (43) is matched with the inner wall of the connecting table (15).
7. The device for preventing the blood return of the catheter according to claim 6, wherein the top of the connecting table (15) of the upper shell (1) is provided with an external thread connector (12), and a luer taper inner cone connector (11) is arranged in the external thread connector (12); the external thread connector (12) and the luer taper inner conical connector (11) are used for connecting an infusion appliance;
the bottom of the base (4) is provided with a conduit connector (45); the catheter connector (45) is used for connecting an in-vivo catheter;
the inner cone joint (11), the upper shell cavity (13), the anti-backflow cavity (44) and the conduit connector (45) are internally communicated to form cavities formed in the upper shell (1) and the base (4);
the supporting table (41) and the connecting table (15) are correspondingly connected in an adapting way, and the supporting table (41) and the connecting table (15) are correspondingly provided with positioning columns (14) and positioning grooves (42) which are mutually matched.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210348225.0A CN114748785B (en) | 2022-04-01 | 2022-04-01 | Device for preventing catheter from back-bleeding |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210348225.0A CN114748785B (en) | 2022-04-01 | 2022-04-01 | Device for preventing catheter from back-bleeding |
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| CN114748785A CN114748785A (en) | 2022-07-15 |
| CN114748785B true CN114748785B (en) | 2023-07-07 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4106497A (en) * | 1977-02-04 | 1978-08-15 | Becton, Dickinson And Company | Multiple sample needle assembly with indicator means |
| JP2006262968A (en) * | 2005-03-22 | 2006-10-05 | Sumitomo Bakelite Co Ltd | Check valve |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100517197B1 (en) * | 2003-05-10 | 2005-10-28 | 송경진 | Reversible vein resin needle set for one time use |
| TWM469074U (en) * | 2012-11-16 | 2014-01-01 | Lily Medical Corp | Needle-free connector module |
| CN203525076U (en) * | 2013-10-11 | 2014-04-09 | 苏州市雅思精密模具有限公司 | Countercurrent-resistant remaining needle |
| CN205145280U (en) * | 2015-10-10 | 2016-04-13 | 王学博 | Malleation does not have adapter |
| CN207575553U (en) * | 2017-03-14 | 2018-07-06 | 北京天地和协科技有限公司 | A kind of Anti-reflux infusion device |
| KR101888473B1 (en) * | 2017-08-11 | 2018-08-16 | (주)가이버 | Filter for liquid line used for medical use with filtration function and reverse flow shutoff function |
| CN208877511U (en) * | 2017-10-28 | 2019-05-21 | 深圳浩斯方医用耗材有限公司 | A kind of no-needle transfusion connector |
| CN213158950U (en) * | 2020-06-08 | 2021-05-11 | 郑州迪奥医学技术有限公司 | Disposable positive pressure needleless connector |
-
2022
- 2022-04-01 CN CN202210348225.0A patent/CN114748785B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4106497A (en) * | 1977-02-04 | 1978-08-15 | Becton, Dickinson And Company | Multiple sample needle assembly with indicator means |
| JP2006262968A (en) * | 2005-03-22 | 2006-10-05 | Sumitomo Bakelite Co Ltd | Check valve |
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| CN114748785A (en) | 2022-07-15 |
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