CN111658956B - Improved arteriovenous cannula - Google Patents

Abstract

The invention discloses an improved arteriovenous cannula which comprises a tube body, an elastic support body arranged on the tube body and a drainage hole, wherein the drainage hole penetrates through the tube body; the elastic support body comprises an elastic piece and a deformation piece, the elastic piece is abutted against the deformation piece, and the drainage hole and the deformation piece are positioned in the same area of the tube body; the deformation piece is provided with a deformation hole along the axial direction of the pipe body. Through the cooperation of the tube body, the elastic support body and the drainage hole, the elastic part supports the tube body, and the deformation part supports the drainage hole, so that the tube body collapse phenomenon in the use process is prevented, and the blood circulation is prevented from being blocked; the elastic support body has good elastic deformation performance, and solves the problems that the conventional product is difficult to sleeve, the positioning is not accurate enough, and the production efficiency is not high.

Description

Improved arteriovenous cannula

technical field

The invention relates to the technical field of medical devices, in particular to an improved arteriovenous cannula.

Background technique

Arteriovenous cannula (including arterial cannula, venous cannula, femoral artery cannula and femoral vein cannula, etc.) are often used in various surgeries requiring cardiopulmonary bypass. In addition, in order to increase the drainage effect, intubation is generally realized by opening lateral drainage holes (or drainage grooves); drainage holes (or drainage grooves) are mainly opened in the area where the support sheet is located. The support sheet provides support for the drainage hole; the blood vessels in the human body are meandering, and the cannula needs to be inserted along the blood vessel. In the existing cannula, the position of the support sheet has poor bending performance due to its structural characteristics , poor flexibility, inconvenient for doctors to operate, and even damage human blood vessels in severe cases.

In addition, in the production process of the arteriovenous cannula, since the spring and the support piece need to be sleeved in the inner tube of the cannula, and the gap between the two is very small, the common thin-walled support pieces are elastically deformed at present. The poor performance leads to the difficulty in setting the support piece during the production process, the positioning is not accurate enough, and the production efficiency is not high.

SUMMARY OF THE INVENTION

In view of the deficiencies of the prior art, the present invention provides an improved arteriovenous cannula.

An improved arteriovenous cannula disclosed by the invention comprises: a tube body, an elastic support body and a drainage hole, the elastic support body is arranged in the tube body, and the elastic support body includes an elastic part and a deformation part, and the elastic part abuts the deformation part, The deformation member is provided with a deformation hole along the axial direction of the tube body, and the drainage hole is opened in the section of the tube body where the deformation member is located (that is, the drainage hole and the deformation member are located in the same area of the tube body).

According to an embodiment of the present invention, the deformation member is provided with deformation holes along the axial direction and the radial direction of the pipe body.

According to an embodiment of the present invention, the elastic support body is made of a metal with memory function, such as nickel-titanium alloy. The inner diameter of the elastic support can be increased by applying a pressing force to both ends of the elastic support, which is convenient for the sleeve of the elastic support in the production process.

According to an embodiment of the present invention, the deformation member includes an end deformation piece and a middle deformation piece, the end deformation piece is disposed at the distal end of the pipe body, and the middle deformation piece is disposed in the middle of the pipe body.

According to an embodiment of the present invention, the end deforming piece includes a first connecting sub-piece, a first supporting deformation sub-piece and a second connecting sub-piece which are connected in sequence, and the second connecting sub-piece abuts against the elastic member.

According to an embodiment of the present invention, the end deforming piece includes a first connecting sub-piece, a first supporting deformation sub-piece and a second connecting sub-piece that are connected in sequence, and the second connecting sub-piece abuts the elastic member; the first connecting piece The deformation holes on the sheet and the second connecting sub-piece are opened along the radial direction of the pipe body; the deformation holes on the first supporting deformation sub-piece are opened along the axial direction of the pipe body.

According to an embodiment of the present invention, the first support deformation sub-piece is provided with a first support hole, and the drainage hole and the first support hole are located in the same area of the pipe body.

According to an embodiment of the present invention, the middle deformation piece includes a third connecting sub-piece, a second supporting deformation sub-piece, and a fourth connecting sub-piece that are connected in sequence, and the third connecting sub-piece and the fourth connecting sub-piece abut elastically pieces.

According to an embodiment of the present invention, the middle deformation piece includes a third connecting sub-piece, a second supporting deformation sub-piece, and a fourth connecting sub-piece that are connected in sequence, and the third connecting sub-piece and the fourth connecting sub-piece abut elastically The deformation holes on the third connecting sub-piece and the fourth connecting sub-piece are opened along the radial direction of the pipe body, and the deformation holes on the second supporting deformation sub-piece are opened along the axial direction of the pipe body.

According to an embodiment of the present invention, the second supporting deformation sub-piece is provided with a second supporting hole, and the second supporting hole and the drainage hole are located in the same area of the pipe body.

According to an embodiment of the present invention, the pipe body includes a pipe body, a reducing joint and a connecting head which are connected in sequence.

According to an embodiment of the present invention, the included angle between the pipe body and the reducing joint is an obtuse angle or a flat angle.

According to an embodiment of the present invention, the tube body includes an inner tube and an outer tube sleeved on the inner tube, and both the elastic member and the deforming member are sleeved outside the inner tube.

According to an embodiment of the present invention, the elastic member is a spring.

According to an embodiment of the present invention, the cross section of the elastic member is circular or rectangular.

According to an embodiment of the present invention, the elastic member and/or the deformation member are made of metal with memory function.

The beneficial effect of the present invention is that, through the cooperative use of the tube body, the elastic support body and the drainage hole, the elastic member provides support for the tube body, and the deformable member provides support for the drainage hole, so as to prevent the tube body from collapsing during use, resulting in blood circulation At the same time, the deformation holes on the deforming part are arranged, so that there is a deformation space in the deforming part, which is beneficial to improve the bending performance of the tube body and increase the flexibility, so that the tube body can better move along the blood vessels, and can also reduce the tube body. The risk of body damage to blood vessels is more conducive to the doctor's control. The elastic support body is made of metal with memory function such as nickel-titanium alloy, which has good elastic deformation performance. During the production process, it is first stretched and sleeved into the inner tube of the cannula, and then restored and fixed by its memory function after it is in place. On the inner tube, the problems of difficulty in setting conventional arteriovenous cannulation products, inaccurate positioning and low production efficiency are effectively solved.

Description of drawings

The drawings described herein are used to provide further understanding of the present application and constitute a part of the present application. The schematic embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation of the present application. In the attached image:

Fig. 1 is the three-dimensional structure diagram of the improved arteriovenous cannula in the embodiment;

2 is a structural diagram of an improved arteriovenous cannula in the embodiment;

3 is another structural diagram of the improved arteriovenous cannula in the embodiment;

Fig. 4 is the three-dimensional structure diagram of the end deformation piece in the embodiment;

FIG. 5 is a three-dimensional structural view of the middle deformation piece in the embodiment.

Description of reference numerals

1-pipe body; 11-pipe body; 111-inner pipe; 112-outer pipe; 12-reducer joint; 13-connector;

2- elastic support body; 21- elastic part; 22- deformation part; 221- end deformation piece; 2211- first connecting sub-piece; 2212- first supporting deformation sub-piece; 22121- first supporting hole; Two connecting sub-pieces; 222-the middle deformation piece; 2221-the third connecting sub-piece; 2222-the second supporting deformation sub-piece; 22221-the second supporting hole; 2223-the fourth connecting sub-piece; 23-deforming hole;

3- Drainage hole.

Detailed ways

Various embodiments of the present invention will be disclosed in the drawings below, and for the sake of clarity, many practical details will be described together in the following description. It should be understood, however, that these practical details should not be used to limit the invention. That is, in some embodiments of the invention, these practical details are unnecessary. In addition, for the purpose of simplifying the drawings, some well-known structures and components will be shown in a simple schematic manner in the drawings.

In addition, descriptions such as “first”, “second”, etc. in the present invention are only for the purpose of description, and do not refer to the meaning of order or sequence, nor are they used to limit the present invention. The components or operations are described by the same technical terms, and should not be construed as indicating or implying their relative importance or implying the quantity of the indicated technical features. Thus, a feature delimited with "first", "second" may expressly or implicitly include at least one of that feature. In addition, the technical solutions between the various embodiments can be combined with each other, but must be based on the realization by those of ordinary skill in the art. When the combination of technical solutions is contradictory or cannot be realized, it should be considered that the combination of technical solutions does not exist. , is not within the scope of protection required by the present invention.

It should be noted that, in the present invention, "proximal end" and "distal end" are relative orientations, relative positions, and directions of elements or actions relative to each other from the perspective of the doctor using the medical device, although "proximal end" " and "distal" are not limiting, but "proximal" generally refers to the end of the medical device that is closest to the physician during normal operation, and "distal" generally refers to the end that first enters the patient.

As shown in Figures 1-3, Figure 1 is a three-dimensional structural view of the improved arteriovenous cannula in the embodiment; Figure 2 is a structural diagram of the improved arteriovenous cannula in the embodiment; Figure 3 is the improved arteriovenous cannula in the embodiment. Another structural diagram of the venous cannula. The improved arteriovenous cannula of the present invention includes a tube body 1 , an elastic support body 2 and a drainage hole 3 . Preferably, the elastic support body 2 can be made of a metal with memory function, which has good elastic deformation performance; for example, such as nickel-titanium alloy. The elastic support body 2 includes an elastic member 21 and a deforming member 22. The elastic member 21 and the deforming member 22 are both sleeved on the pipe body 1, and the elastic member 21 and the deforming member 22 are in contact with each other. The drainage hole 3 is opened at the position where the deforming member 22 is located. The section of the tube body 1 (that is, the drainage hole 3 and the deformation member 22 are located in the same area of the tube body 1 ). Specifically, the elastic member 21 and/or the deforming member 22 are made of metal with memory function and have good elastic deformation performance. The deformation member 22 is provided with a deformation hole 23 along the axial direction of the pipe body 1 . In addition, when the deformation hole 23 is opened at the end of the distal end of the pipe body 1, the insertion of the deformation member 22 through the end inlet does not require a particularly large elastic deformation, so the deformation hole 23 of the end section can also be radially deformed. (that is, the deformation member 22 is provided with deformation holes 23 along the axial and radial directions of the pipe body 1). The elastic member 21 provides support for the tube body 1, so that the tube body 1 has a certain longitudinal rigidity and bendability, and is not easy to collapse and collapse, and the deformation member 22 provides support for the drainage hole 3. Provide deformation space for it during use, that is, when the tube body 1 is bent, due to the arrangement of the deformation hole 23, the entire deformation member 22 can be correspondingly bent with the tube body 1, and maintains the relationship with the elastic member 21. The force is convenient for the doctor to continue to manipulate the tube body 1.

Preferably, the pipe body 1 includes a pipe body 11 , a reducing joint 12 and a connecting head 13 , the pipe body 11 , the reducing joint 12 and the connecting head 13 are connected in sequence, and the elastic member 21 and the deforming member 22 are sleeved on the pipe body 11 . . In specific application, the included angle between the tube body 11 and the reducing joint 12 is an obtuse angle or a flat angle, and the included angle formed by the distal end of the tube body 11 and the middle of the tube body 11 is also an obtuse angle or a flat angle, which is convenient for the tube body 1 to be inserted into the human body. , the transition between different sections is smoother, preventing damage to human tissue. The outer diameter of the reducing joint 12 is larger than the outer diameter of the pipe body 11, which is convenient for expanding the opening on the human body to the required degree. connect.

Further preferably, the tube body 11 includes an inner tube 111 and an outer tube 112, the outer tube 112 is sleeved on the inner tube 111, the elastic member 21 and the deforming member 22 are both sleeved on the inner tube 111, and the elastic member 21 and the deformation member 22 are located in the inner tube 111. between the inner tube 111 and the outer tube 112 . In the production process, the elastic member 21 and the deforming member 22 are firstly stretched and sleeved on the inner tube 111, and then restored and fixed on the inner tube 111 by their memory function, and finally the outer tube 112 is sleeved on the elastic member 21 and the inner tube 111. The deformation part 22 effectively solves the problems of difficulty in setting conventional products, inaccurate positioning and low production efficiency. The drainage hole 3 penetrates through the inner tube 111 and the outer tube 112 . Specifically, the inner tube 111 and the outer tube 112 are both made of TPU (Thermoplastic polyurethanes, thermoplastic polyurethane elastomer rubber) to improve their wear resistance, transparency and elasticity.

In a specific application, the elastic member 21 is a spring, and the cross-section of the elastic member 21 may be circular or square.

Referring again to FIG. 4 , FIG. 4 is a three-dimensional structural view of the end deforming piece 221 in the embodiment. Preferably, the deformation member 22 includes an end deformation piece 221 and a middle deformation piece 222, the end deformation piece 221 is located at the distal end of the tube body 11, the middle deformation piece 222 is located in the middle of the tube body 11, and the end deformation piece 221 and the middle deformation piece Each of the sheets 222 is provided with a drainage hole 3 . In a specific application, the end deformation piece 221 includes a first connecting sub-piece 2211, a first supporting deformation sub-piece 2212 and a second connecting sub-piece 2213, and the first connecting sub-piece 2211 and the second connecting sub-piece 2213 are respectively disposed on the first Both ends of the deformable sub-sheet 2212 are supported, and the second connection sub-sheet 2213 abuts against the elastic member 21 . The first connection sub-sheet 2211 , the first supporting deformable sub-sheet 2212 and the second connection sub-sheet 2213 are provided with a plurality of deformation holes. 23 , and the plurality of deformation holes 23 are distributed along the longitudinal direction of the three, and the longitudinal direction refers to the direction parallel to the axial direction of the pipe body 1 .

During production, the inner diameter of the end deformation piece 221 is increased by applying a force in a parallel direction along the axial direction of the tube body 1 (for example, by pressing both ends of the end deformation piece 221 ), and the corresponding multiple deformations The hole 23 provides a deformation space for the end deforming piece 221 , so that the end deforming piece 221 can be easily sleeved into the inner tube 111 , and then restored to its original shape and fixed on the inner tube 111 after it is in place.

Due to the arrangement of the deformation holes 23 and the mesh structure of the first connecting sub-piece 2211 , the first supporting deformation sub-piece 2212 and the second connecting sub-piece 2213 , the bending performance of the formed tube body 1 during use and the returnability are improved. The elastic performance has been greatly improved. Specifically, the second connecting sub-piece 2213 is provided with a protruding portion (not marked in the figure) where the second connecting sub-piece 2213 abuts the elastic member 21. Since the elastic member 21 has a blank space in the end section, the protruding portion is mainly used to fill the The blank space, that is to say, the longitudinal section of the connection between the second connecting sub-piece 2213 and the elastic member 21 is stepped; so that the overall force of the tube body 1 is uniform, and the blank space can also be prevented from being squeezed and deformed, and the blood channel can be narrowed. The first connecting sub-piece 2211 is located at the distal end of the tube body 11. Since the distal end of the tube body 11 that first enters the human body, the initial extrusion force is the largest, so the tube body 1 needs to have a stronger supporting force. Therefore, the expanded area of the first connection sub-sheet 2211 is larger than that of the second connection sub-sheet 2213 . In this embodiment, the first connecting sub-piece 2211, the first supporting deformation sub-piece 2212 and the second connecting sub-piece 2213 may be integrally formed or assembled; the first connecting sub-piece 2211, the first supporting and deforming sub-piece 2211 2212 and the second connecting sub-piece 2213 can be selected from materials with certain elasticity and memory function, such as nickel-titanium alloy, which can not only improve their bending performance and resilience performance, but also can be easily inserted into the inner tube 111, making the installation easier. It is quicker, thereby improving the assembly efficiency; the processing technology of the three can be laser engraving or stamping.

Further preferably, the first supporting deformation sub-piece 2212 is provided with a first supporting hole 22121 , the drainage hole 3 and the first supporting hole 22121 are located in the same area of the pipe body 1 , and the diameter of the first supporting hole 22121 is larger than that of the drainage hole 3 . , which is beneficial to improve the support force of the drainage hole 3 and prevent the collapse of the pipe body 1 around the drainage hole 3 during use. In a specific application, the number of the first support holes 22121 is multiple, the multiple first support holes 22121 are arranged around the first support deformation sub-piece 2212, and the multiple first support holes 22121 are symmetrically arranged two by two, which is convenient for subsequent drainage holes. The opening of 3, that is, when opening the drainage hole 3, can be directly opened from one side of the pipe body 1 to the other side, reducing the processing steps, shortening the processing time, and improving the processing efficiency.

Referring again to FIG. 5 , FIG. 5 is a three-dimensional structural diagram of the middle deformation piece 222 in the embodiment. Preferably, the middle deformation piece 222 includes a third connection sub-piece 2221, a second support deformation sub-piece 2222 and a fourth connection sub-piece 2223, and two ends of the second support deformation sub-piece 2222 are respectively connected to the third connection sub-piece 2221 and the fourth connection sub-piece 2221. Four connecting sub-pieces 2223, at the same time, the third connecting sub-piece 2221 and the fourth connecting sub-piece 2223 abut the elastic member 21; Each of them is provided with a plurality of deformation holes 23, and the plurality of deformation holes 23 are distributed along the longitudinal direction of the three. The production process of the middle deformed sheet 222 is the same as that of the end deformed sheet 221, and details are not repeated here. In specific applications, the third connecting sub-piece 2221 and the fourth connecting sub-piece 2223 are both provided with raised portions, which function the same as the raised portions in the second connecting sub-piece 2213 . Specifically, the structures of the third connection sub-piece 2221 and the fourth connection sub-piece 2223 may be the same or different. In practical application, a plurality of middle deformation pieces 222 can be provided according to the length of the pipe body 11 or the usage requirements, so as to enhance the bending performance of the pipe body 1 . In this embodiment, the third connecting sub-piece 2221, the second supporting deformation sub-piece 2222 and the fourth connecting sub-piece 2223 may be integrally formed or assembled; the third connecting sub-piece 2221, the second supporting and deforming sub-piece 2221 2222 and the fourth connecting sub-piece 2223 can be selected from materials with certain elasticity and memory function, such as nickel-titanium alloy, which can not only improve its bending performance, but also be easily inserted into the inner tube 111, making the installation quicker, and then Improve assembly efficiency; the processing technology of the three can be laser engraving or stamping.

Further preferably, the second supporting deformation sub-piece 2222 is provided with a second supporting hole 22221 , the drainage hole 3 and the second supporting hole 22221 are located in the same area of the pipe body 1 , and the diameter of the second supporting hole 22221 is larger than that of the drainage hole 3 . , which is beneficial to improve the support force of the drainage hole 3 and prevent the collapse of the pipe body 1 around the drainage hole 3 during use. In a specific application, the number of the second support holes 22221 is multiple, the multiple second support holes 22221 are arranged around the second support deformation sub-piece 2222, and the multiple second support holes 22221 are symmetrically arranged two by two, which is convenient for subsequent drainage holes. The opening of 3, that is, when opening the drainage hole 3, can be directly opened from one side of the pipe body 1 to the other side, reducing the processing steps, shortening the processing time, and improving the processing efficiency. In this embodiment, the first support hole 22121 and the second support hole 22221 are the same. Of course, during use, the structures of the first support hole 22121 and the second support hole 22221 can also be different, as long as their diameter is larger than the drainage hole 3 Can.

When assembling the improved arterial and venous cannula, firstly insert a plurality of elastic pieces 21 and a plurality of middle deformation pieces 222 into the inner tube 111 at intervals, insert the end deformation pieces 221 into the distal end of the inner tube 111, and then cover the outer tube 112 Then, the drainage holes 3 are opened at the positions of the inner tube 111 and the outer tube 112 corresponding to the first support hole 22121 and the second support hole 22221, and finally the reducing joint 12 is connected to the The head 13 is assembled accordingly.

In summary, through the combined use of the tube body, the elastic support body and the drainage hole, the elastic piece provides support for the tube body, and the deformed piece provides support for the drainage hole, preventing the tube body from collapsing during use, resulting in obstruction of blood flow. The deformation holes on the deforming part are arranged, so that there is a deformation space in the deforming part, which is beneficial to improve the bending performance of the tube body, increase the flexibility, make the tube body better move along the blood vessels, and also reduce the damage of the tube body to the blood vessels. Risk, more conducive to the doctor's control. The elastic support body is made of metal with memory function such as nickel-titanium alloy, which has good elastic deformation performance. During the production process, it is first stretched and sleeved into the inner tube of the cannula, and then restored and fixed by its memory function after it is in place. On the inner tube, the problems of difficulty in setting conventional arteriovenous cannulation products, inaccurate positioning and low production efficiency are effectively solved.

The above description is merely an embodiment of the present invention, and is not intended to limit the present invention. Various modifications and variations of the present invention are possible for those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the scope of the claims of the present invention.

Claims (7)

1. An improved arteriovenous cannula, characterized in that it comprises: a tube body, an elastic support body and a drainage hole, the elastic support body is arranged on the tube body, and the elastic support body comprises an elastic part and a deformation part , the elastic piece abuts the deformation piece, the deformation piece is provided with a deformation hole along the axial direction of the pipe body, and the drainage hole is opened in the pipe body section where the deformation piece is located; The deformation piece includes an end deformation piece and a middle deformation piece, the end deformation piece is arranged at the distal end of the pipe body, and the middle deformation piece is arranged at the middle of the pipe body; The end deformation piece includes a first connecting sub-piece, a first supporting deformation sub-piece and a second connecting sub-piece which are connected in sequence, and the second connecting sub-piece abuts against the elastic member; The first supporting deformation sub-piece is provided with a first supporting hole, and the drainage hole and the first supporting hole are located in the same area of the pipe body. 2 . The improved arteriovenous cannula according to claim 1 , wherein the middle deformation piece comprises a third connecting sub-piece, a second supporting deformation sub-piece and a fourth connecting sub-piece connected in sequence, so that the Both the third connecting sub-piece and the fourth connecting sub-piece abut against the elastic member. 3 . The improved arteriovenous cannula according to claim 2 , wherein the second support deformation sub-piece is provided with a second support hole, and the second support hole and the drainage hole are located in the tube. 4 . the same area of the body. 4 . The improved arteriovenous cannula according to claim 1 , wherein the pipe body comprises a pipe body, a reducing joint and a connecting head which are connected in sequence, and the pipe body comprises an inner pipe and is sleeved on the The outer tube of the inner tube, the elastic piece and the deformation piece are all sleeved outside the inner tube. 5. The improved arteriovenous cannula according to any one of claims 1-4, wherein the elastic member is a spring. 6 . The improved arteriovenous cannula according to claim 5 , wherein the cross section of the elastic member is circular or rectangular. 7 . 7. The improved arteriovenous cannula according to any one of claims 1-4, characterized in that, the deformation member is made of metal with memory function.

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