CN115192892A - A body-surface interface system combined with intravascular fistula - Google Patents

Abstract

The invention provides a body surface interface system combined with intravascular fistula, which comprises: the artificial blood vessel is embedded in human tissue, one end of the artificial blood vessel is an artery port and is connected with the autologous artery of the patient, and the other end of the artificial blood vessel is a vein port and is connected with the autologous vein of the patient; 2 flat-mouth needle tube connectors which are respectively and integrally connected to the artificial blood vessel and form 2 side branch structures with the artificial blood vessel, and the ports of the 2 flat-mouth needle tube connectors are exposed on the surface of the skin and are parallel and level to the surface of the skin to form a channel outside the human blood vessel connector; the flat-mouth puncture outfit comprises a flat-mouth needle tube which can be inserted into the flat-mouth needle tube connector and a needle seat for installing the flat-mouth needle tube, and the flat-mouth puncture outfit is used for connecting an extracorporeal blood pipeline. This structure combines artificial blood vessel fistula, flat mouthful of puncture ware and flat mouthful of needle tubing connector, and the internal fistula of being convenient for is maintained, reduces the internal fistula pathological change, practices thrift the blood vessel resource that the patient can make the fistula, prolongs internal fistula and patient's life-span.

Description

A body-surface interface system combined with intravascular fistula

technical field

The invention relates to the field of medical devices, in particular to a body surface interface system combined with an intravascular fistula.

Background technique

Hemodialysis is one of the ways of renal replacement therapy for patients with acute and chronic renal failure. It drains the blood from the body to the outside of the body, through a dialyzer composed of hollow fibers, the blood and dialysate pass through the hollow fibers, and use the principles of dispersion, ultrafiltration, adsorption and convection to exchange substances, remove metabolic wastes in the body, maintain electrolytes and acid-base. Balance; at the same time removing excess water from the body and returning the purified blood to the whole process is called hemodialysis. The patient needs to establish a blood access for hemodialysis treatment, that is, an intravascular fistula, which can increase the blood flow rate and thicken the wall of the venous blood vessel to facilitate puncture. This operation is called a fistula.

At present, the autologous arteriovenous fistula of the upper extremity is the preferred choice for ostomy, followed by artificial vascular fistula, vascular fistula of the lower extremity, and central venous cannulation. Compared with artificial vascular fistula, autogenous arteriovenous fistula is less prone to stenosis, infection and other diseases, and has a longer survival time. The central vein is a key part of the human body. The intubation site is prone to lesions, which will endanger the patient's life. It is not easy to use. After long-term dialysis treatment, even the autologous arteriovenous fistula will have lesions, and it is difficult to repair, and eventually it needs to be replaced with a new internal fistula. The human body has limited vascular resources to establish autologous arteriovenous fistulas, and artificial vascular fistulas also need to be connected to autologous blood vessels, so these blood vessels are scarce resources; if they are exhausted, patients will eventually be unable to receive dialysis treatment, which is life-threatening.

In addition to the limitation of the location of the fistula, each dialysis needs to puncture the internal fistula with a fistula needle, usually two fistula needles are punctured separately. The thicker diameter of the fistula needle is 1.5-1.6mm, and patients generally need more than twice a week of dialysis. Fistula needle puncture seriously damages the skin tissue of the patient's internal fistula, and each puncture is very painful, which has great harm to the patient's body and mind. Moreover, at present, metal needles with sharp angles are often used in clinical practice to puncture the skin, which is easy to accidentally injure patients and nurses and cause accidental infection.

SUMMARY OF THE INVENTION

In view of this, the present invention aims to propose a body surface interface system combined with vascular fistula, combined with artificial vascular fistula and flat needle tube connector, which is convenient for internal fistula maintenance, reduces internal fistula lesions, saves vascular resources of patient's fistula, and prolongs internal fistula. Fistula and patient longevity.

In order to achieve the above object, the technical scheme of the present invention is achieved in this way:

A body-surface interface system incorporating an endovascular fistula, comprising:

The artificial blood vessel is buried in the human tissue. One end of the artificial blood vessel is an arterial port, which is connected to the patient's own artery, and the other end of the artificial blood vessel is a venous port, which is connected to the patient's own vein;

Two flat-mouth needle tube connectors are integrally connected to the artificial blood vessel, and form two side branch structures with the artificial blood vessel. The ports of the two flat-mouth needle tube connectors are exposed on the surface of the skin and are flush with the surface of the skin, becoming the connection of human blood vessels to the body. channel; the size of the flat needle tube connector can be determined according to the thickness of the patient's subcutaneous tissue;

The flat-mouth trocar includes a flat-mouthed needle tube that can be inserted into a flat-mouthed needle tube connector and a needle seat for installing the flat-mouthed needle tube. The flat-mouthed trocar is used to connect an extracorporeal blood pipeline.

Further, the flat needle tube connector includes a casing, a fixing ring, a one-way valve and a protective cap; one end of the casing is inserted into the artificial blood vessel, and is integrally formed with the artificial blood vessel, and the casing is provided with several stacked one-way valves. The upper part of the fixing ring is provided with a fixing ring for fixing, the center of the fixing ring is provided with an insertion hole for inserting the flat trocar, and the upper part of the fixing ring is provided with a protective cap for sealing.

Further, the shell includes an integrally formed shell body and a shell tail, the diameter of the shell body is larger than that of the shell tail, the shell tail is inserted inside the artificial blood vessel, and the connection between the shell body and the shell tail forms a step for supporting the one-way valve.

Further, both the port of the housing body and the port of the rear of the housing are chamfered surfaces.

Further, the distance from the innermost end of the chamfered surface to the step inside the housing body is equal to or slightly larger than the sum of the thicknesses of the fixing ring and the plurality of one-way valves.

Further, a positioning ring is provided on the outer side wall of the housing body, and the positioning ring is embedded in the skin to prevent the interface from moving under force and causing damage to the human body.

Further, the protective cap is provided with a connecting nose, and the connecting nose is provided with a through hole.

There is also a groove inside the protective cap. After dialysis, the groove at the bottom of the protective cap is put into cotton wool soaked with disinfectant, and then covered with the port of the flat needle tube connector to prevent liquid and foreign objects from entering the interior and prevent infection.

Further, the outer side wall of the flat-mouthed needle tube is provided with a convex limit table, and the fixing ring is provided with a gap for the limit table to pass through.

Further, the fixing ring is threadedly connected with the housing.

Further, it also includes a balloon catheter, the balloon end of the balloon catheter extends into the housing through the one-way valve, and the balloon end can be used to block the blood vessel after inflation, and the one-way valve can slide along the balloon catheter.

Compared with the prior art, the body surface interface system combined with vascular fistula described in the present invention has the following advantages:

(1) The body surface interface system combined with the vascular fistula of the present invention can be embedded in human tissue in advance, and only the port of the flat needle tube connector is leaked on the skin surface to become a channel for human blood vessels to connect to the outside of the body. This structure can avoid puncture. Perforating the skin, reducing the pain of each puncture for dialysis patients; avoiding the damage to blood vessels caused by metal needles with puncture bevels, protecting vascular resources, saving patients' vascular resources, ensuring the normal use of artificial blood vessels, and prolonging the service life.

(2) The flat needle tube connector of the present invention includes a housing, a fixing ring, a one-way valve and a protective cap. When in use, the protective cap is removed, and the flat needle tube is inserted into the housing through the fixing ring and the one-way valve in turn to realize the tube. The connection of the road is simple and convenient to operate. After dialysis is complete, put the protective cap back on to protect the flush needle connector.

(3) The body surface interface system combined with the vascular fistula of the present invention can also be used to replace and repair the flat needle tube connector with a balloon catheter, so as to prolong the service life of the device. The flat-mouth needle connector can also be opened, and the diseased blood vessels can be dredged and treated, so as to prolong the life of the internal fistula, and there is no need to create a new internal fistula.

Description of drawings

The accompanying drawings constituting a part of the present invention are used to provide further understanding of the present invention, and the exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the attached image:

1 is a schematic diagram of a body surface interface system combined with an intravascular fistula according to an embodiment of the present invention;

2 is a schematic structural diagram of the flush needle tube connector according to the embodiment of the present invention;

3 is a cross-sectional view of the flush needle tube connector according to the embodiment of the present invention;

4 is a schematic structural diagram of a fixing ring according to an embodiment of the present invention;

Fig. 5 is the installation structure diagram of the flush needle tube connector according to the embodiment of the present invention;

6 is a schematic structural diagram of a flat-mouth trocar according to an embodiment of the present invention;

7 is a cross-sectional view of the flat-mouth trocar according to an embodiment of the present invention;

8 is a state diagram of the use of the body surface interface system combined with the vascular fistula according to the embodiment of the present invention;

Fig. 9 is the operation schematic diagram of replacing the one-way valve;

FIG. 10 is a structural diagram of a maintenance operation of this structure.

Description of reference numbers:

1-arterial blood vessel; 11-arterial port; 12-venous port; 2-flush needle connector; 21-housing; 211-housing body; 212-housing tail; 213-step; 22-fixing ring; 222-notch; 23-check valve; 24-protecting cap; 25-locating ring; 26-connecting nose; 261-through hole; 3-flat trocar; 31-flat needle; 32-needle seat; 4-joint; 5-extracorporeal artery side blood pipeline; 6-extracorporeal venous side blood pipeline; 7-patient's own artery; 8-patient's own vein; 9-balloon catheter.

Detailed ways

It should be noted that the embodiments of the present invention and the features of the embodiments may be combined with each other under the condition of no conflict.

In the description of the present invention, it should be understood that the terms "center", "portrait", "horizontal", "top", "bottom", "front", "rear", "left", "right", " The orientation or positional relationship indicated by vertical, horizontal, top, bottom, inner, outer, etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and The description is simplified rather than indicating or implying that the device or element referred to must have a particular orientation, be constructed and operate in a particular orientation, and therefore should not be construed as limiting the invention. In addition, the terms "first", "second", etc. are used for descriptive purposes only, and should not be construed as indicating or implying relative importance or implying the number of indicated technical features. Thus, a feature defined as "first", "second", etc., may expressly or implicitly include one or more of that feature. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

In the description of the present invention, it should be noted that the terms "installed", "connected" and "connected" should be understood in a broad sense, unless otherwise expressly specified and limited, for example, it may be a fixed connection or a detachable connection Connection, or integral connection; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be internal communication between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood through specific situations.

The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

A body-surface interface system incorporating an endovascular fistula, comprising:

The artificial blood vessel 1 is embedded in human tissue, one end of the artificial blood vessel is an arterial port 11, and is connected with the patient's autologous artery 7, and the other end of the artificial blood vessel is a venous port 12, and is connected with the patient's autologous vein 8;

Two flat-mouthed needle tube connectors 2 are integrally connected to the artificial blood vessel, and form two side branch structures with the artificial blood vessel. The ports of the two flat-mouthed needle tube connectors are exposed on the skin surface and are flush with the skin surface to become human blood vessel connections. extracorporeal channels;

The material of the flat needle tube connector is made of materials with excellent biocompatibility, which reduces rejection reaction and prolongs the service life.

Specifically, the flat needle tube connector includes a casing 21, a fixing ring 22, a one-way valve 23 and a protective cap 24; one end of the casing is inserted into the artificial blood vessel, and is integrally formed with the artificial blood vessel, and the casing is provided with several stacked one-way valves. The upper part of the one-way valve is provided with a fixing ring for fixing, the center of the fixing ring is provided with an insertion hole 221 for inserting a flush trocar, and a protective cap for sealing is arranged above the fixing ring. More specifically, the number of one-way valves can be two, and the one-way valve can be made of soft elastic material, which can be directly clamped in the casing during installation, which is convenient for disassembly and replacement.

The structure also includes a balloon catheter 9, the balloon end of the balloon catheter extends into the housing through the one-way valve, and the balloon end can be used to block blood vessels after inflation, and the one-way valve can slide out of the housing along the balloon catheter.

After the one-way valve is used for many times, if bleeding occurs and needs to be replaced, as shown in Figure 9, the new one-way valve is first set on the balloon catheter. The balloon is inflated to block the blood vessel, the old one-way valve is taken out along the catheter, the old one-way valve is cut off, and the new one-way valve on the catheter is placed in the dialysis port to complete the replacement.

If it is diagnosed that the blood vessels near the internal fistula have blockage, stenosis, infection and other diseases, as shown in Figure 10, the fixing ring can be removed, and the one-way valve can be removed if necessary. The blood vessels are dredged and treated, thereby prolonging the life of the internal fistula. This open channel facilitates the maintenance of the internal fistula.

More specifically, the shell includes an integrally formed shell body 211 and a shell tail 212, the diameter of the shell body is larger than the diameter of the shell tail, the shell tail is inserted inside the artificial blood vessel, and the connection between the shell body and the shell tail is formed to support one-way Step 213 of the valve.

The port of the shell body and the port at the tail of the shell are both chamfered surfaces, the chamfered surface of the port of the shell body is convenient to keep flush with the skin, and the chamfered surface of the port at the tail of the shell is convenient for blood flow in the artificial blood vessel.

The distance from the lowest end of the chamfered surface to the step inside the housing body is equal to or slightly smaller than the sum of the thicknesses of the fixing ring and several one-way valves, which can facilitate the installation of the fixing ring and the one-way valve.

The retaining ring can be plugged directly into the housing, or, preferably, the retaining ring is screwed to the housing.

A positioning ring 25 is arranged on the outer side wall of the housing body, and the positioning ring is embedded in the skin to prevent the interface from moving under force and causing damage to the human body.

The protective cap is provided with a connecting nose 26, and the connecting nose is provided with a through hole 261. If the protective cap adheres to the flat needle tube connector and is not easy to remove, a metal wire can be passed through the through hole 261 to remove the protective cap.

There is also a groove inside the protective cap. After dialysis, the groove at the bottom of the protective cap is put into cotton wool soaked with disinfectant, and then covered with the port of the flat needle tube connector to prevent liquid and foreign objects from entering the interior and prevent infection. The outer side wall of the flat needle tube is provided with a raised limiting platform 33, and the fixing ring is provided with a notch 222 for the limiting platform to pass through. Insert the flat-mouthed needle so that the limiter is aligned with the notch. When the limiter is fully inserted, rotate the flat-mouthed needle tube to stagger the limiter and the notch to prevent the flat-mouth trocar from falling off during dialysis treatment.

The flat-mouth trocar 3 includes a flat-mouthed needle tube 31 that can be inserted into the flat-mouthed needle tube connector and a needle holder 32 for installing the flat-mouthed needle tube. The flat-mouthed trocar is used to connect the extracorporeal blood pipeline, such as connecting the extracorporeal artery side blood pipeline 5 and the extracorporeal needle respectively. Venous side blood line 6.

The arterial port is used to draw out the arterial blood, so that the blood after dialysis flows back to the human vein through the arterial extracorporeal blood pipeline, the dialyzer, the venous extracorporeal blood pipeline, and the venous port.

Specific use principle:

The two ends of the artificial blood vessel 1 are connected to the patient's own arterial and venous blood vessels through surgery, which is a mature technology at present. The artificial blood vessel 1 and the flat-mouthed needle tube connector are embedded in the human tissue one week in advance, and the two flat-mouthed needle tube connector ports are flush with the surface of the skin, which become the channels for the human blood vessels to connect to the outside of the body. The positioning ring 25 on the shell is stuck in the skin to prevent the interface from moving under force and causing damage to the human body.

3-4 weeks after surgery, a trial of internal fistula for hemodialysis can be started.

A flush needle connector is used to draw blood from the artery into the dialysis line. Another flush needle connector is used to introduce blood from a dialysis tube into a human vein.

The body surface interface system combined with vascular fistula can be pre-buried in human tissue, and only the port of the flat needle tube connector is leaked on the skin surface to become a channel for human blood vessels to connect to the body. At the same time, it protects the vascular resources, saves the patient's vascular resources, ensures the normal use of the artificial vascular fistula, and prolongs the service life.

The present invention can also be applied to continuous renal replacement therapy (CRRT) similar to hemodialysis, blood perfusion or plasma exchange and other extracorporeal blood purification treatments.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the scope of the present invention. within the scope of protection.

Claims (10)

1. a body surface interface system in conjunction with vascular fistula, is characterized in that: comprise: The artificial blood vessel is embedded in human tissue, one end of the artificial blood vessel is an arterial port, and is connected to the patient's own artery, and the other end of the artificial blood vessel is a venous port, and is connected to the patient's own vein; Two flat-mouth needle tube connectors are integrally connected to the artificial blood vessel, and form two side branch structures with the artificial blood vessel. The ports of the two flat-mouth needle tube connectors are exposed on the surface of the skin and are flush with the surface of the skin, becoming the connection of human blood vessels to the body. channel; The flat-mouth trocar includes a flat-mouthed needle tube that can be inserted into the flat-mouthed needle tube connector and a needle seat for installing the flat-mouthed needle tube. The flat-mouthed trocar is used to connect an extracorporeal blood pipeline. 2. The body surface interface system combined with intravascular fistula according to claim 1, characterized in that: the flat needle tube connector comprises a casing, a fixing ring, a one-way valve and a protective cap; The blood vessel is connected and formed integrally with the artificial blood vessel. Several stacked one-way valves are arranged in the shell. The upper part of the one-way valve is provided with a fixing ring for fixing. There is a protective cap on the top of the fixing ring, which plays a sealing role. 3. The body surface interface system combined with vascular fistula according to claim 2, characterized in that: the shell comprises an integrally formed shell body and a shell tail, the diameter of the shell body is greater than the diameter of the shell tail, and the shell tail is connected to the artificial blood vessel Inside, the connection between the housing body and the rear of the housing forms a step for supporting the one-way valve. 4 . The body surface interface system combined with vascular fistula according to claim 3 , wherein the port of the shell body and the port of the tail of the shell are both chamfered surfaces. 5 . 5. The body surface interface system combined with vascular fistula according to claim 4, characterized in that: the distance between the inner part of the housing body from the lowest end of the chamfered surface to the step is equal to or slightly larger than the fixed ring and several one-way The sum of the valve thicknesses. 6. The body surface interface system combined with vascular fistula according to claim 3, characterized in that: a positioning ring is provided on the outer side wall of the shell body, and the positioning ring is embedded in the skin to prevent the interface from being forced damage to the human body. 7 . The body surface interface system combined with vascular fistula according to claim 2 , wherein the protective cap is provided with a connecting nose, and the connecting nose is provided with a through hole. 8 . 8 . The body surface interface system combined with vascular fistula according to claim 2 , wherein the outer side wall of the flat-mouthed needle tube is provided with a raised limiting platform, and the fixing ring is provided with a stop for the limiting platform to pass through. 9 . gap. 9 . The body surface interface system combined with vascular fistula according to claim 2 , wherein the fixing ring is threadedly connected to the housing. 10 . 10. The body surface interface system combined with an endovascular fistula according to claim 2, further comprising a balloon catheter, the balloon end of the balloon catheter extends into the housing through the one-way valve, and the balloon end After inflation, it can be used to block blood vessels, and the one-way valve can slide along the balloon catheter.

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