CN114748785A - Device for preventing catheter blood return - Google Patents
Device for preventing catheter blood return Download PDFInfo
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- CN114748785A CN114748785A CN202210348225.0A CN202210348225A CN114748785A CN 114748785 A CN114748785 A CN 114748785A CN 202210348225 A CN202210348225 A CN 202210348225A CN 114748785 A CN114748785 A CN 114748785A
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- cavity
- valve
- reflux valve
- reflux
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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
-
- 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 catheter from returning blood, belonging to the technical field of medical instruments; the device comprises an upper shell and a base which are mutually sleeved, wherein communicated cavities are formed in the upper shell and the base; the cavity is internally provided with a reverse-flow prevention valve, the outer diameter of the reverse-flow prevention valve is matched with the inner wall of the cavity, the reverse-flow prevention valve divides the cavity into two parts, and the bottom of the reverse-flow prevention valve is provided with a cutting seam; the anti-reflux valve comprises an anti-reflux valve barrel which is of a thin-wall barrel-shaped structure, the bottom of the anti-reflux valve barrel is provided with an anti-reflux valve bottom, and the bottom of the anti-reflux valve bottom is provided with a cutting seam; the anti-reflux valve cylinder is internally sleeved with a separating cylinder, and the side surface of the separating cylinder is provided with a deformation hole. The invention can effectively prevent blood in the tube body from flowing back to cause tube blockage after the transfusion is finished, and has convenient use, wide application range and high cost performance.
Description
Technical Field
The invention relates to a device for preventing catheter blood return, and belongs to the technical field of medical instruments.
Background
Catheters are medical devices that establish an important pathway between the outside world and the blood circulation in the body, and can be used to intravenously infuse various drugs, including blood products, and blood 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 generally composed of a body 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.
Disclosure of Invention
The invention overcomes the defects of the prior art, provides the device for preventing the catheter from returning blood, can effectively prevent the blood in the catheter body from flowing back to cause the blockage of the catheter after the transfusion is finished, and has the advantages of convenient use, wide application range and high cost performance.
The device for preventing the catheter from returning blood comprises an upper shell and a base which are mutually sleeved, wherein communicated cavities are formed in the upper shell and the base;
the cavity is internally provided with a backflow prevention valve, the outer diameter of the backflow prevention valve is matched with the inner wall of the cavity, the backflow prevention valve divides the cavity into two parts, and the bottom of the backflow prevention valve is provided with a cutting seam;
the anti-reflux valve comprises an anti-reflux valve barrel, the anti-reflux valve barrel is of a thin-wall barrel-shaped structure, the bottom of the anti-reflux valve barrel is provided with an anti-reflux valve bottom, and the bottom of the anti-reflux valve bottom is provided with a cutting seam;
the anti-reflux valve cylinder is internally sleeved with a separating cylinder, and the side surface of the separating cylinder is provided with a deformation hole.
Preferably, the backflow prevention valve divides the cavity into a first cavity and a second cavity from the upper case to the base;
when the pressure difference that the pressure of the first cavity is greater than that of the second cavity is greater 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, 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 cut 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 upper 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 chamber pressure is greater than the second chamber pressure difference Δ P1, the first chamber pressure is the infusion pressure; the second cavity pressure, namely the intracorporeal 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.
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 back suction, and when the pressure of the second cavity is greater than the pressure difference delta P2 of the first cavity, the incision at the bottom of the anti-reflux valve is sunken and opened towards the direction of the syringe, blood flows from the second cavity to the direction of the first cavity, and the blood sample is successfully collected.
Upon withdrawal of the infusion set:
after infusion or blood sample collection is finished, when the upper shell withdraws from the infusion apparatus, the first cavity can generate vacuum capacity, at the moment, the thin wall at the upper part of the anti-reflux valve is sunken into the separation cylindrical variable hole to generate deformation for compensating the vacuum capacity generated when the infusion apparatus is withdrawn, the bottom of the anti-reflux valve is not deformed, a cutting seam of the anti-reflux valve is kept closed, and the second cavity and the liquid of the internal catheter are in a static state, so that the internal catheter is prevented from generating blood reflux to cause tube blockage.
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 apparatus, the pressure of the second cavity is greater than that of the first cavity and is less than delta P2, and the arc-shaped anti-reflux valve bottom needs to be opened by a pressure greater than delta P2, so that during the intermittent treatment period, the cutting seam 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 anti-backflow valve bottom is concave downwards to form a transition arc shape, and the anti-backflow valve barrel and the anti-backflow valve bottom are arranged from the upper shell to the base.
Preferably, after the infusion or the collection of the blood sample is finished, when the upper shell withdraws from the infusion apparatus, the first cavity generates vacuum capacity, and the thin wall of the backflow-preventing valve cylinder is sunken into the separation cylinder-shaped variable hole to deform so as to compensate the vacuum capacity generated when the infusion apparatus is withdrawn; the bottom of the anti-reflux valve is not deformed, and a cutting seam of the anti-reflux valve is kept closed; the second cavity and the liquid in the catheter in the body are in a static state, so that the catheter in the body is prevented from generating blood backflow to cause tube blockage.
Preferably, the vacuum volume compensation range upon withdrawal of the infusion set: 0-0.1 mL;
Δ P1 is less than the pressure of gravity infusion, Δ P1 range: 0-10 kPa; Δ P2 is greater than the human blood pressure limit, Δ P2 range: 30-50 kPa.
Preferably, the outer wall of the top end of the anti-reflux valve bottom is provided with a sealing platform in an outward protruding mode, the sealing platform is used for sealing a gap between the outer wall of the anti-reflux valve and the inner wall of the cavity, the sealing platform ensures that the anti-reflux valve and the inner wall of the cavity are sealed, and the upper shell and the base are communicated only through a cutting seam of the anti-reflux valve; the cutting seam is opened during infusion, so that the forward flow of liquid is realized; when blood return is prevented, the cutting joint is ensured to be in a closed state.
Preferably, the sealing platform of the backflow prevention valve bottom extends downwards to the whole backflow prevention valve bottom; the wall thickness of the bottom of the anti-reflux valve is greater than that of the anti-reflux valve barrel; the anti-reflux valve barrel is easier to deform relative to the anti-reflux valve base, after the anti-reflux valve barrel deforms, the anti-reflux valve is closed, a cutting seam at the bottom of the anti-reflux valve does not deform any more, namely, the anti-reflux valve barrel cannot be opened outwards and cannot be recessed inwards, the anti-reflux valve is closed, the communication between the upper shell and the base is blocked, namely, the communication between the catheter and the infusion apparatus is blocked, and the blood backflow is prevented.
Preferably, the bottom of the anti-backflow valve bottom is provided with a reinforcing rib, and the reinforcing rib and the cutting seam are arranged in a crossed mode; the strength of the cutting seam of the anti-reflux valve bottom is improved, and the opening and closing of the cutting seam of the anti-reflux valve bottom have better controllability.
Preferably, the reinforcing rib is arranged on the outer surface or the inner surface of the backflow prevention valve bottom.
Preferably, the base comprises a supporting table, a limiting cylinder 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 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 and is in matched connection with the limiting cylinder, and an upper shell cavity is formed in the connecting table;
the top of the anti-reflux valve barrel is outwards provided with a valve plate limiting table;
the top of the separation cylinder is outwards provided with a separation limit platform;
the separating limit table, the valve block limit table and the limit cylinder are sequentially clamped from top to bottom;
the separating limit table, the valve plate limit table and the limit cylinder are matched with the upper shell cavity; the outer wall of the limiting cylinder is matched with the inner wall of the connecting table.
Preferably, the upper shell cavity is a three-step cavity; the middle part of the limiting cylinder is provided with a clamping table in an outward protruding way; the three-layer step cavity is respectively arranged corresponding to the separating limit table, the valve plate limit table and the clamping table; the limiting and supporting device is used for limiting and supporting the separating cylinder and the anti-reflux valve.
Preferably, the top of the connecting platform of the upper shell is provided with an external thread connector, and a luer cone internal cone connector is arranged in the external thread connector; the external thread connector and the internal cone connector of the luer cone are used for connecting an infusion apparatus;
the bottom of the base is provided with a conduit connector; the catheter connector is used for connecting an internal catheter;
the inner cone joint of the luer cone, the upper shell cavity, the anti-reflux cavity and the catheter connector are communicated to form a cavity formed in the upper shell and the base;
the supporting table and the connecting table are correspondingly and adaptively connected, and the supporting table and the connecting table are correspondingly provided with positioning columns and positioning grooves which are mutually adaptive.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention divides the upper shell and the cavity in the base into two parts by the anti-reflux valve, the connection and the closing between the upper shell and the base are realized by arranging the cutting slot at the bottom of the anti-reflux valve, thereby realizing that the liquid on the upper shell and the base can flow forwards to realize normal transfusion, the liquid can flow backwards by the back-pumping equipment to realize liquid back-flow, when the transfusion or the back-pumping is not carried out, the anti-reflux valve is closed to play a role of balancing the internal and external pressure of the connector, so as to avoid the phenomenon that the blood in the tube body flows backwards to cause tube blockage when the transfusion is finished and the transfusion apparatus and the connector are separated, the use is convenient, the application range is wide, and the cost performance is high.
2. Through setting up the valve section of thick bamboo and the sealing bench of preventing against current, the sealing bench ensures to prevent sealing between the valve section of thick bamboo and last casing and the base against current, ensures to go up through the joint-cutting intercommunication between casing and the base, through opening and closing of joint-cutting, realizes going up intercommunication and separation between casing and the base to realize infusion and liquid backward flow, prevent the blood backward flow.
3. Through setting up the strengthening rib, can strengthen the intensity that prevents the valve bottom joint-cutting of backflowing corresponds, strengthen the controllability of joint-cutting open and closed state, ensure to prevent the blood backward flow to guarantee the normal clear of infusion and liquid backward flow.
4. Through setting up the three-layer step cavity as last casing cavity, can be well with the ka tai of spacing section of thick bamboo, spacing platform of valve block and the spacing looks adaptation of separation are arranged, through setting up the seal platform, go up the casing, separate a section of thick bamboo, prevent that reflux valve and base adapt to each other well and sealed, prevent that the reflux valve can accomplish the separation and the intercommunication between casing and the base, through the pressure of adjusting first cavity pressure and second cavity, through the pressure difference between the two, realize opening and closing of joint-cutting, through the vacuum of first cavity or second cavity, through preventing that the reflux valve section of thick bamboo takes place deformation through the deformation hole, supplementary joint-cutting is closed, solve the problem of blood backward flow.
5. 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: a schematic perspective explosion structure of embodiment 1 of the present invention,
FIG. 2: embodiment 1 of the present invention is a schematic sectional structure,
FIG. 3: the sectional structure of A-A in figure 2 is schematic,
FIG. 4: a schematic view of a three-dimensional structure of the upper shell,
FIG. 5: the cross-sectional structural schematic diagram of the upper shell body,
FIG. 6: the three-dimensional structure of the base is schematically shown,
FIG. 7: the cross-sectional structural schematic diagram of the base,
FIG. 8: the cross-sectional structure of the anti-reflux valve is schematic,
FIG. 9: the cross-sectional structure of B-B in FIG. 8 is schematic,
FIG. 10: a schematic view of a three-dimensional structure of the anti-reflux valve,
FIG. 11: the schematic diagram of the three-dimensional structure of the separation cylinder,
FIG. 12: the cross-sectional structural schematic diagram of the separating cylinder,
FIG. 13: the cross-sectional structure of C-C in FIG. 12 is schematically shown.
In the figure: 1. an upper housing; 2. a separation cylinder; 3. an anti-reflux valve; 4. a base;
11. a luer taper inner taper joint; 12. an external thread connector; 13. an upper housing cavity; 14. a positioning column; 15. a connecting table;
21. separating a limiting table; 22. a deformation hole;
31. a valve plate limiting table; 32. an anti-reflux valve barrel; 33. a sealing table; 34. a backflow prevention valve bottom; 35. cutting a seam; 36. reinforcing ribs;
41. a support table; 42. positioning a groove; 43. a limiting cylinder; 44. a backflow prevention cavity; 45. a conduit connector; 46. and (7) clamping the table.
Detailed Description
Example 1
As shown in fig. 1 to 13, the device for preventing catheter blood return according to the present invention comprises an upper shell 1 and a base 4 which are sleeved with each other, wherein the upper shell 1 and the base 4 are provided with a communicating cavity therein;
the cavity is internally provided with a reverse-flow prevention valve 3, the outer diameter of the reverse-flow prevention valve 3 is matched with the inner wall of the cavity, the reverse-flow prevention valve 3 divides the cavity into two parts, and the bottom of the reverse-flow prevention valve 3 is provided with a cutting joint 35;
the anti-reflux valve 3 comprises an anti-reflux valve cylinder 32, the anti-reflux valve cylinder 32 is of a thin-wall cylinder structure, the bottom of the anti-reflux valve cylinder 32 is provided with an anti-reflux valve bottom 34, and the bottom of the anti-reflux valve bottom 34 is provided with a cutting seam 35; the valve 3 for preventing reverse-flow may be integrally formed;
the separation cylinder 2 is sleeved in the backflow prevention valve cylinder 32, and the side surface of the separation cylinder 2 is provided with a deformation hole 22.
The cavity is divided into a first cavity and a second cavity from the upper shell to the base by the anti-reflux valve;
when the pressure difference that the pressure of the first cavity is greater than that of the second cavity is greater 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 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, 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 cut of the anti-reflux valve is kept closed.
The backflow prevention valve bottom 34 is concave downwards to form a transition arc shape, and the backflow prevention valve cylinder 32 and the backflow prevention valve bottom 34 are arranged from the upper shell 1 to the base 4. The anti-reflux valve base 34 can be configured as a smooth-transitioning arc, and the anti-reflux valve base 34 can be configured as a hemisphere or ellipsoid or other smooth-transitioning arc.
When the infusion or blood sample collection is finished and the upper shell withdraws from the infusion apparatus, the first cavity generates vacuum capacity, and the thin wall of the backflow-preventing valve cylinder 32 is sunken into the separation cylinder-shaped variable hole 22 to deform so as to compensate the vacuum capacity generated when the infusion apparatus is withdrawn; the bottom of the anti-reflux valve is not deformed, and a cutting seam of the anti-reflux valve is kept closed; the second cavity and the internal catheter liquid are in a static state, so that the internal catheter is prevented from generating blood backflow to cause tube blockage, and the device is convenient to use, wide in application range and high in cost performance.
Vacuum capacity compensation range: 0-0.1 mL.
Δ P1 is less than the pressure of gravity infusion, Δ P1 range: 0-10 kPa; Δ P2 is greater than the human blood pressure limit, Δ P2 range: 30-50 kPa.
The sealing platform 33 is arranged on the outer wall of the top end of the anti-reflux valve bottom 34 in an outward protruding mode, and the sealing platform 33 is used for sealing a gap between the outer wall of the anti-reflux valve 3 and the inner wall of the cavity; the sealing platform ensures that the anti-reflux valve is sealed with the inner wall of the cavity, and the upper shell is communicated with the base only through a cutting seam of the anti-reflux valve; the cutting seam is opened during infusion, so that the forward flow of liquid is realized; when blood return is prevented, the cutting joint is ensured to be in a closed state.
The sealing platform 33 of the backflow prevention valve bottom 34 extends downwards to the whole backflow prevention 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-reflux valve barrel is easier to deform relative to the anti-reflux valve base, after the anti-reflux valve barrel deforms, the anti-reflux valve is closed, a cutting seam at the bottom of the anti-reflux valve does not deform any more, namely, the anti-reflux valve barrel cannot be opened outwards and cannot be recessed inwards, the anti-reflux valve is closed, the communication between the upper shell and the base is blocked, namely, the communication between the catheter and the infusion apparatus is blocked, and the 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 to cross the slit 35; the strength of the cutting seam of the anti-reflux valve bottom is improved, and the opening and closing of the cutting seam of the anti-reflux valve bottom have better controllability. The ribs 36 may be provided on the outer surface or the inner surface of the backflow prevention valve bottom 34. The valve for preventing reverse-flow may be formed integrally and may be made of elastic material. The base 4 comprises a supporting platform 41, a limiting cylinder 43 is arranged on the supporting platform 41 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 platform 41.
As shown in fig. 1-5 and 11-13, the upper housing 1 includes a connecting platform 15, the connecting platform 15 is connected to the supporting platform 41 in a contacting manner, the connecting platform 15 is connected to the limiting cylinder 43 in a matching manner, and an upper housing cavity 13 is formed in the connecting platform;
the top of the anti-reflux valve cylinder 32 is outwards provided with a valve plate limiting table 31;
the top of the separating cylinder 2 is outwards provided with a separating and limiting table 21;
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 limiting table 21, the valve plate limiting table 31 and the limiting cylinder 43 are matched 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; the middle part of the limiting cylinder 43 is provided with a clamping table 46 in an outward protruding way; the three-layer step cavity is respectively arranged corresponding to the separation limit table 21, the valve plate limit table 31 and the clamping table 46; for limiting and supporting the separation cylinder 2 and the valve 3 for preventing reverse-flow.
The top of a connecting platform 15 of the upper 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 internal luer taper connector 11 are used for connecting an infusion apparatus;
as shown in fig. 1-3 and 6-7, the bottom of the base 4 is provided with a conduit connector 45; the catheter connector 45 is used for connecting a catheter in the body;
the inner cone joint 11 of the luer cone, the upper shell cavity 13, the anti-reflux cavity 44 and the conduit connector 45 are communicated to form cavities arranged in the upper shell 1 and the base 4;
the supporting table 41 and the connecting table 15 are correspondingly matched and connected, and the supporting table 41 and the connecting table 15 are correspondingly provided with a positioning column 14 and a positioning groove 42 which are mutually matched.
The base can integrated into one piece, and the upper housing can integrated into one piece.
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 rib thickness and width, and the strength of the elastomeric material. The upper shell, the base and the separating cylinder 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:
the external thread connector 12 and the internal cone connector 11 of the luer taper of the upper shell are connected with the infusion apparatus.
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 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.
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 back suction, and when the pressure of the second cavity is greater than the pressure difference delta P2 of the first cavity, the incision at the bottom of the anti-reflux valve is sunken and opened towards the direction of the syringe, blood flows from the second cavity to the direction of the first cavity, and the blood sample is successfully collected.
3. Upon withdrawal of the infusion set:
after transfusion or blood sample collection is finished, when the upper shell withdraws from the infusion apparatus, the first cavity can generate vacuum capacity, at the moment, the thin-wall cylindrical anti-reflux valve cylinder of the anti-reflux valve is sunken into the deformation hole 22 to deform and is used for compensating the vacuum capacity generated when the infusion apparatus is withdrawn, the anti-reflux valve bottom does not deform, a cutting seam of the anti-reflux valve is kept closed, and the second cavity and the liquid of the internal catheter are in a static state, so that the internal catheter is prevented from generating blood reflux to cause pipe blockage.
4. 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 apparatus, the pressure of the second cavity is greater than that of the first cavity and is less than delta P2, and the arc-shaped anti-reflux valve bottom needs to be opened by a pressure greater than delta P2, so that during the intermittent treatment period, the cutting seam 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.
The description of the directions and the relative position relationship of the structures in the present invention, such as the description of the front, the back, the left, the right, the upper and the lower, does not limit the present invention, and is only for the convenience of description.
Claims (10)
1. A device for preventing catheter blood return is characterized by comprising an upper shell (1) and a base (4) which are mutually sleeved, wherein communicated cavities are formed in the upper shell (1) and the base (4);
the anti-reflux valve (3) is arranged in the cavity, 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 a cutting seam (35) is arranged at the bottom of the anti-reflux valve (3);
the anti-reflux valve (3) comprises an anti-reflux valve barrel (32), the anti-reflux valve barrel (32) is of a thin-wall barrel-shaped structure, the bottom of the anti-reflux valve barrel (32) is provided with an anti-reflux valve bottom (34), and the bottom of the anti-reflux valve bottom (34) is provided with a cutting seam (35);
the anti-reflux valve cylinder (32) is internally provided with a separating cylinder (2), and the side surface of the separating cylinder (2) is provided with a deformation hole (22).
2. The device for preventing catheter flashback as defined in claim 1, wherein the valve for preventing backflow divides the cavity from the upper housing to the base into a first cavity and a second cavity;
when the pressure difference that the pressure of the first cavity is greater than that of the second cavity is greater 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 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, 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 cut of the anti-reflux valve is kept closed.
3. The device for preventing catheter blood return according to claim 2, wherein the backflow preventing valve bottom (34) is recessed downward in a transitional arc shape, and the backflow preventing valve cylinder (32) and the backflow preventing valve bottom (34) are disposed from the upper housing (1) to the base (4).
4. The device for preventing catheter blood return according to claim 3, wherein after the infusion or collection of the blood sample is completed, when the upper housing is withdrawn from the infusion set, the first cavity generates a vacuum volume, and the thin wall (32) of the backflow prevention valve cylinder is deformed by being sunken into the separation cylinder deformation hole (22) so as to compensate the vacuum volume generated when the infusion set is withdrawn; the anti-reflux valve bottom (34) is not deformed, and a cutting seam of the anti-reflux valve is kept closed; the second cavity and the liquid of the internal catheter are in a static state, so that the internal catheter is prevented from generating blood backflow to cause tube blockage.
5. The device for preventing catheter flashback as in claim 4, wherein the vacuum volume compensation range upon withdrawal of the infusion set: 0-0.1 mL.
Δ P1 is less than the pressure of gravity infusion, Δ P1 range: 0-10 kPa;
Δ P2 is greater than the human blood pressure limit, Δ P2 range: 30-50 kPa.
6. The device for preventing catheter blood return according to any one of claims 1 to 5, wherein a sealing platform (33) is provided to protrude outwards from the outer wall of the top end of the anti-reflux valve bottom (34), and the sealing platform (33) is used for sealing the gap between the outer wall of the anti-reflux valve (3) and the inner wall of the cavity.
7. The device for preventing catheter flashback, as set forth in claim 6, characterized in that the sealing land (33) of the backflow prevention valve bottom (34) extends down to the entire backflow prevention valve bottom (34); the wall thickness of the backflow prevention valve bottom (34) is larger than that of the backflow prevention valve barrel (32).
8. The device for preventing catheter blood return according to claim 6, wherein the bottom of the backflow preventing valve bottom (34) is provided with a reinforcing rib (36), and the reinforcing rib (36) is arranged to cross the slit (35).
9. The device for preventing catheter blood return according to claim 8, wherein the base (4) comprises a support table (41), the support table (41) is provided with a limiting cylinder (43) along the inner circumference upwards, and the limiting cylinder (43) and the support table (41) are internally provided with an anti-reflux cavity (44) matched with the anti-reflux valve (3);
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-reflux valve cylinder (32) is outwards provided with a valve plate limiting table (31);
the top of the separating cylinder (2) is outwards provided with a separating limit table (21);
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 limiting table (21), the valve plate limiting table (31) and the limiting cylinder (43) are matched 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).
10. The device for preventing catheter blood return according to claim 9, characterized in that the top of the connection platform (15) of the upper 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 internal cone connector (11) of the luer cone are used for connecting an infusion apparatus;
the bottom of the base (4) is provided with a guide pipe connector (45); the catheter connector (45) is used for connecting a catheter in the body;
the inner conical joint (11) of the luer cone, the upper shell cavity (13), the anti-reflux cavity (44) and the catheter connector (45) are communicated 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 a positioning column (14) and a positioning groove (42) which are mutually adaptive.
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| Application Number | Priority Date | Filing Date | Title |
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| 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 |
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| CN202210348225.0A CN114748785B (en) | 2022-04-01 | 2022-04-01 | Device for preventing catheter from back-bleeding |
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| CN114748785B CN114748785B (en) | 2023-07-07 |
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| 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 |
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| US4106497A (en) * | 1977-02-04 | 1978-08-15 | Becton, Dickinson And Company | Multiple sample needle assembly with indicator means |
| KR20040096707A (en) * | 2003-05-10 | 2004-11-17 | 송경진 | Reversible vein resin needle set for one time use |
| JP2006262968A (en) * | 2005-03-22 | 2006-10-05 | Sumitomo Bakelite Co Ltd | Check valve |
| TWM469074U (en) * | 2012-11-16 | 2014-01-01 | Lily Medical Corp | Needle-free connector module |
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| Publication number | Publication date |
|---|---|
| CN114748785B (en) | 2023-07-07 |
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