CN111658956B

CN111658956B - Improved arteriovenous cannula

Info

Publication number: CN111658956B
Application number: CN202010606041.0A
Authority: CN
Inventors: 魏信鑫; 刘志军; 马奔; 袁栋平
Original assignee: Dongguan Kewei Medical Instrument Co Ltd
Current assignee: Dongguan Kewei Medical Instrument Co Ltd
Priority date: 2020-06-29
Filing date: 2020-06-29
Publication date: 2022-06-14
Anticipated expiration: 2040-06-29
Also published as: CN111658956A

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 instruments, in particular to an improved arteriovenous cannula.

Background

Arteriovenous cannulas (including arterial cannulas, venous cannulas, femoral arterial cannulas, femoral venous cannulas and the like) are often used in various surgeries requiring extracorporeal circulation, the conventional cannulas mainly comprise a tube sleeve, a thin-walled spring arranged in the tube sleeve and a support sheet at present, and in addition, in order to increase the drainage effect, the cannulas are generally realized by arranging lateral drainage holes (or drainage grooves); the drainage holes (or drainage grooves) are mainly formed in the areas where the supporting sheets are located, and the supporting sheets provide support for the drainage holes; the blood vessel in the human body is meandered, the intubation tube needs to be inserted along the blood vessel, and in the existing intubation tube, the position of the supporting sheet is poor in bending performance and flexibility due to the structural characteristics, so that the intubation tube is inconvenient for a doctor to operate, and the blood vessel of the human body can be damaged in serious cases.

In addition, in the production and manufacturing process of the arteriovenous cannula, because the spring and the supporting sheet are required to be sleeved in the inner tube of the cannula, and the gap between the spring and the supporting sheet is very small, the elastic deformation performance of the common thin-wall supporting sheet is poor at present, so that the supporting sheet is difficult to sleeve in the production process, the positioning is not accurate enough, and the production efficiency is not high.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides an improved arteriovenous cannula.

The invention discloses an improved arteriovenous cannula, which comprises: body, elastic support body and drainage hole, the elastic support body sets up in the body, and the elastic support body includes elastic component and deformation piece, and the deformation hole has been seted up along the body axial to the elastic component butt deformation piece, and the drainage hole is seted up in the body district section (drainage hole and deformation piece are located the same region of body promptly) that the deformation piece is located.

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

According to one embodiment of the present invention, the elastic support body is made of a metal having a memory function, such as nitinol. The inner diameter of the elastic supporting piece can be increased by applying pressing force to the two ends of the elastic supporting piece, the elastic supporting piece is sleeved conveniently in the production process, and the elastic supporting piece can be restored to the original state by utilizing the memory function of the elastic supporting piece to realize fixation after the elastic supporting piece is loosened after the elastic supporting piece is sleeved in place.

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 tube body, and the middle deformation piece is disposed at the middle of the tube body.

According to an embodiment of the present invention, the end portion deforming piece includes a first connecting sub-piece, a first supporting deforming 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 one embodiment of the present invention, the end deformation piece includes a first connection sub-piece, a first support deformation sub-piece, and a second connection sub-piece connected in sequence, the second connection sub-piece abutting against the elastic member; the deformation holes on the first connecting sub-piece and the second connecting sub-piece are formed along the radial direction of the pipe body; the deformation hole on the first support deformation sub-sheet is arranged 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 region of the tube body.

According to an embodiment of the present invention, the middle deformable piece includes a third connecting sub-piece, a second supporting deformable sub-piece and a fourth connecting sub-piece which are connected in sequence, and the third connecting sub-piece and the fourth connecting sub-piece are both abutted against the elastic member.

According to an embodiment of the present invention, the middle deformation sheet includes a third connection sub-sheet, a second support deformation sub-sheet and a fourth connection sub-sheet, which are connected in sequence, and the third connection sub-sheet and the fourth connection sub-sheet are both abutted against the elastic member; the deformation holes in the third connecting sub-piece and the fourth connecting sub-piece are formed along the radial direction of the pipe body, and the deformation holes in the second supporting deformation sub-piece are formed along the axial direction of the pipe body.

According to an embodiment of the present invention, 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 same region of the tube body.

According to an embodiment of the present invention, the pipe body includes a pipe body, a reducer union and a connector, which are sequentially connected.

According to an embodiment of the invention, the pipe body and the reducer union form an obtuse angle or a straight 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 the elastic member and the deformation member are both sleeved on the outer tube.

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

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

According to an embodiment of the present invention, the elastic member and/or the deforming member is made of metal having a memory function.

The blood vessel drainage device has the beneficial effects that through the matching use of the tube body, the elastic support body and the drainage hole, the elastic piece provides support for the tube body, and the deformation piece provides support for 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 is made of metal with a memory function, such as nickel-titanium alloy, has good elastic deformation performance, is firstly sleeved into the intubation tube in a propping manner in the production process, and is restored and fixed on the inner tube by utilizing the memory function after being in place, so that the problems of difficult sleeving, inaccurate positioning and low production efficiency of the conventional arteriovenous intubation product are effectively solved.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:

FIG. 1 is a perspective view of an improved arteriovenous cannula of an embodiment;

FIG. 2 is a block diagram of an improved arteriovenous cannula of an embodiment;

FIG. 3 is another view of the improved arteriovenous cannula of the embodiment;

FIG. 4 is a perspective view of an end deforming piece in the embodiment;

FIG. 5 is a perspective view of a middle deformable sheet in the embodiment.

Description of the reference numerals

1-a pipe body; 11-a tube body; 111-an inner tube; 112-an outer tube; 12-a reducer union; 13-a connector;

2-an elastic support; 21-an elastic member; 22-a deformation; 221-end deformation tabs; 2211-first connector sub-sheet; 2212-first supporting deformed sub-pieces; 22121-first support aperture; 2213-second connector sub-pieces; 222-middle deformed sheet; 2221-third connector sub-piece; 2222-a second supporting deformation sub-sheet; 22221-second support hole; 2223-fourth connector piece; 23-deformation holes;

and 3-drainage holes.

Detailed Description

In the following description, for purposes of explanation, numerous implementation details are set forth in order to provide a thorough understanding of the various embodiments of the present invention. It should be understood, however, that these implementation details are not to be interpreted as limiting the invention. That is, in some embodiments of the invention, such implementation details are not necessary. In addition, some conventional structures and components are shown in simplified schematic form in the drawings for the sake of simplicity.

In addition, the descriptions related to "first", "second", etc. in the present invention are used for descriptive purposes only, do not specifically refer to an order or sequence, and do not limit the present invention, but merely distinguish components or operations described in the same technical terms, and are not to be construed as indicating or implying any relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.

It should be noted that in the present invention, "proximal" and "distal" are relative orientations, relative positions, directions of elements or actions with respect to each other from the perspective of a physician using the medical device, although "proximal" and "distal" are not intended to be limiting, the term "proximal" generally refers to the end of the medical device that is closer to the physician during normal operation, and "distal" generally refers to the end that is first introduced into the patient.

As shown in fig. 1-3, fig. 1 is a perspective view of an improved arteriovenous cannula in an embodiment; FIG. 2 is a view showing the construction of an improved arteriovenous cannula in an embodiment; fig. 3 is another structural view of the improved arteriovenous cannula in the embodiment. The improved arteriovenous cannula comprises a tube body 1, an elastic support body 2 and a drainage hole 3, wherein the elastic support body 2 is arranged in the tube body 1, and the drainage hole 3 penetrates through the tube body 1. Preferably, the elastic support body 2 can be made of metal with memory function, and has good elastic deformation performance; for example: such as a nickel titanium alloy. The elastic support body 2 comprises an elastic piece 21 and a deformation piece 22, the elastic piece 21 and the deformation piece 22 are all sleeved on the pipe body 1, the elastic piece 21 and the deformation piece 22 are mutually abutted, and the drainage hole 3 is formed in a section of the pipe body 1 where the deformation piece 22 is located (namely, the drainage hole 3 and the deformation piece 22 are located in the same area of the pipe body 1). Specifically, the elastic member 21 and/or the deformable member 22 are made of metal with a 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. Furthermore, when the deformation opening 23 is provided at the distal end of the tube body 1, no particularly large elastic deformation is required for the insertion of the deformation element 22 from the end inlet, so that the deformation opening 23 of this end section can also be provided radially (i.e. the deformation element 22 is provided with the deformation opening 23 both axially and radially of the tube body 1). Elastic component 21 provides the support for body 1 possesses certain longitudinal rigidity and bendability, be difficult for collapsing and roll over flat, deformation 22 provides the support for drainage hole 3, and simultaneously, deformation hole 23 on the deformation 22 provides the deformation space for it in the use, when body 1 bends promptly, because the setting in deformation hole 23, whole deformation 22 can carry out corresponding bending along with body 1, and keep and the effort between the elastic component 21, the doctor of being convenient for continues to control body 1.

Preferably, the pipe body 1 includes a pipe body 11, a reducer 12 and a connector 13, the pipe body 11, the reducer 12 and the connector 13 are connected in sequence, and the elastic member 21 and the deformation member 22 are all sleeved on the pipe body 11. When the pipe body 1 is used specifically, the included angle between the pipe body 11 and the variable-diameter joint 12 is an obtuse angle or a straight angle, and the included angle between the far end of the pipe body 11 and the middle of the pipe body 11 is also an obtuse angle or a straight angle, so that the transition in different sections is smoother after the pipe body 1 is inserted into a human body, and the damage to human tissues is prevented. The outer diameter of the reducing joint 12 is larger than that of the pipe body 11, so that an opening on a human body is conveniently expanded to a required degree when the pipe is used, and the connector 13 is mainly used for connecting another structural part with the pipe body 11 and the reducing joint 12.

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 element 21 and the deformation element 22 are both sleeved on the inner tube 111, and the elastic element 21 and the deformation element 22 are located between the inner tube 111 and the outer tube 112. In the production process, the elastic part 21 and the deformation part 22 are firstly unfolded and sleeved on the inner tube 111, the memory function of the elastic part and the deformation part is recovered and fixed on the inner tube 111 after the elastic part and the deformation part are in place, and finally the outer tube 112 is sleeved on the elastic part 21 and the deformation part 22, so that the problems of difficulty in sleeving conventional products, inaccurate positioning and low production efficiency are effectively solved. The drainage holes 3 penetrate 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 polyurethane elastomer rubber), which improves the 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 to fig. 4 as well, fig. 4 is a perspective 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 far end of the tube body 11, the middle deformation piece 222 is located at the middle of the tube body 11, and the end deformation piece 221 and the middle deformation piece 222 are both provided with the drainage hole 3. In specific application, the end deformation piece 221 includes a first connection sub-piece 2211, a first supporting deformation sub-piece 2212 and a second connection sub-piece 2213, the first connection sub-piece 2211 and the second connection sub-piece 2213 are respectively disposed at two ends of the first supporting deformation sub-piece 2212, the second connection sub-piece 2213 abuts against the elastic member 21, the first connection sub-piece 2211, the first supporting deformation sub-piece 2212 and the second connection sub-piece 2213 are respectively provided with a plurality of deformation holes 23, and the plurality of deformation holes 23 are distributed along the longitudinal direction of the first connection sub-piece 2211, the longitudinal direction is a direction parallel to the axial direction of the pipe body 1.

During production, the inner diameter of the end deformation sheet 221 is increased by applying a force to the end deformation sheet 221 in a direction parallel to the axial direction of the pipe body 1 (for example, by pressing the two ends of the end deformation sheet 221), and the corresponding deformation holes 23 provide deformation spaces for the end deformation sheet 221, so that the end deformation sheet 221 can be conveniently sleeved into the inner pipe 111, and after being in place, the end deformation sheet 221 is restored to the original shape and fixed on the inner pipe 111.

Due to the arrangement of the deformation hole 23 and the net-shaped 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 and the resilience performance of the formed pipe body 1 in use are greatly improved. Specifically, a protruding portion (not shown) is disposed at a position where the second connecting sub-piece 2213 abuts against the elastic member 21, and since there is a blank at an end section of the elastic member 21, the protruding portion is mainly used for filling the blank, that is, a longitudinal section of a connecting portion of the second connecting sub-piece 2213 and the elastic member 21 is stepped; so that the whole stress of the tube body 1 is uniform, the blank part can be prevented from being extruded and deformed, and the blood channel is reduced. The first connecting sub-piece 2211 is located at the far end of the tube body 11, and since the first pressing force applied to the far end of the tube body 11 is the largest at first, the tube body 1 needs to have stronger supporting force, and therefore the spreading area of the first connecting sub-piece 2211 is larger than that of the second connecting sub-piece 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 deformation sub-piece 2212 and the second connecting sub-piece 2213 can be made of materials with certain elasticity and memory function, such as nickel-titanium alloy, so that the bending performance and the resilience performance of the materials can be improved, the materials can be conveniently sleeved into the inner tube 111, the installation is fast, and the assembly efficiency is further improved; the processing technology of the three can be laser engraving molding or punch molding.

Further preferably, first support deformation sub-piece 2212 has seted up first support hole 22121, and drainage hole 3 is located the same region of body 1 with first support hole 22121, and the diameter of first support hole 22121 is greater than the diameter of drainage hole 3, is favorable to improving the holding power in drainage hole 3, prevents that body 1 around the drainage hole 3 from taking place the phenomenon of collapsing in the use. During specific application, first support hole 22121's quantity is a plurality of, and a plurality of first support holes 22121 encircle first support deformation sub-piece 2212 and set up, and a plurality of first support holes 22121 bisymmetry sets up, and the follow-up seting up of drainage hole 3 of being convenient for, when opening drainage hole 3 promptly, can directly set up to the opposite side from one side of body 1, reduces the processing step, shortens process time, improves machining efficiency.

Referring also to fig. 5, fig. 5 is a perspective view of the middle deformable 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, 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 2223, and meanwhile, the third connection sub-piece 2221 and the fourth connection sub-piece 2223 are both abutted against the elastic member 21; a plurality of deformation holes 23 are formed on the third connecting sub-piece 2221, the second supporting deformation sub-piece 2222 and the fourth connecting sub-piece 2223, and the plurality of deformation holes 23 are distributed along the longitudinal direction of the third connecting sub-piece 2221, the second supporting deformation sub-piece 2222 and the fourth connecting sub-piece 2223. The middle deformation piece 222 is produced in the same process as the end deformation piece 221, and is not described in detail. In a specific application, the third connecting sub-piece 2221 and the fourth connecting sub-piece 2223 are both provided with a protrusion, which has the same function as the protrusion in the second connecting sub-piece 2213. Specifically, the third connecting sub-piece 2221 and the fourth connecting sub-piece 2223 may have the same structure or different structures. During the actual application, can set up a plurality of middle part morphemes 222 according to body of pipe 11 length or user demand, strengthen the bending performance of body of pipe 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 deformation sub-piece 2222 and the fourth connecting sub-piece 2223 can be made of a material with certain elasticity and memory function, such as nitinol, so that the bending performance can be improved, and the connecting sub-piece can be conveniently sleeved into the inner tube 111, so that the installation is quick and convenient, and the assembly efficiency is improved; the processing technology of the three can be laser engraving molding or punch molding.

Further preferably, the second supporting deformation sub-sheet 2222 is provided with second supporting holes 22221, the drainage holes 3 and the second supporting holes 22221 are located in the same region of the tube body 1, and the diameter of the second supporting holes 22221 is greater than that of the drainage holes 3, so that the supporting force of the drainage holes 3 is improved, and the tube body 1 around the drainage holes 3 is prevented from collapsing in the using process. During the specific application, the quantity of second support hole 22221 is a plurality of, and a plurality of second support holes 22221 encircle the setting of second support deformation sub-piece 2222, and a plurality of second support holes 22221 bisymmetry sets up, and the follow-up seting up of drainage hole 3 of being convenient for, when opening drainage hole 3 promptly, can directly set up to the opposite side from one side of body 1, reduce the processing step, shorten process time, improve machining efficiency. In this embodiment, the first support holes 22121 are the same as the second support holes 22221, but the first support holes 22121 and the second support holes 22221 may have different structures during use as long as the diameters thereof are larger than the drainage holes 3.

When the improved arteriovenous cannula is assembled, the elastic pieces 21 and the middle deformation pieces 222 are sleeved in the inner tube 111 at intervals, the end deformation piece 221 is sleeved at the far end of the inner tube 111, the outer tube 112 is sleeved and integrated through a thermoplastic process, then drainage holes 3 are formed in 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 reducer union 12 and the connector 13 are assembled correspondingly.

To sum up, through the body, the cooperation in elastic support body and drainage hole is used, the elastic component provides the support for the body, the deformation piece provides the support for the drainage hole, prevent that the phenomenon of collapsing from appearing in the body in the use, lead to the blood circulation to be obstructed, and simultaneously, deformation hole setting on the deformation piece, make the deformation piece have the deformation space, be favorable to improving the bending performance of body, increase the flexibility, make the body can be better move ahead along the blood vessel, and can also reduce the body and damage vascular risk, more be favorable to controlling of doctor. The elastic support body is made of metal with a memory function, such as nickel-titanium alloy, has good elastic deformation performance, is firstly sleeved into the intubation tube in a propping manner in the production process, and is restored and fixed on the inner tube by utilizing the memory function after being in place, so that the problems of difficult sleeving, inaccurate positioning and low production efficiency of the conventional arteriovenous intubation product are effectively solved.

The above description is only an embodiment of the present invention, and is not intended to limit the present invention. Various modifications and alterations to this invention will become apparent to those skilled in the art. Any modification, equivalent replacement, improvement or the like made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.

Claims

1. An improved arteriovenous cannula, comprising: the elastic support body is arranged on the pipe body and comprises an elastic piece and a deformation piece, the elastic piece abuts against 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 formed in the pipe body section where the deformation piece is located;

the deformation piece comprises an end deformation piece and a middle deformation piece, the end deformation piece is arranged at the far end of the pipe body, and the middle deformation piece is arranged in the middle of the pipe body;

the end part deformation piece comprises 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 is abutted against the elastic piece;

first support deformation sub-piece has seted up first support hole, the drainage hole with first support hole is located the same region of body.

2. The improved arteriovenous cannula of claim 1 wherein the middle deformable flap comprises a third connecting flap, a second supporting deformable flap and a fourth connecting flap connected in sequence, the third connecting flap and the fourth connecting flap both abutting against the resilient member.

3. The improved arteriovenous cannula of claim 2 wherein the second support deformation sub-piece defines a second support hole, and the second support hole and the drainage hole are located in the same region of the cannula body.

4. The improved arteriovenous cannula of claim 1, wherein the tube body comprises a tube body, a reducer union and a connector which are sequentially connected, the tube body comprises an inner tube and an outer tube sleeved on the inner tube, and the elastic part and the deformation part are sleeved outside the inner tube.

5. The improved arteriovenous cannula of any one of claims 1 to 4 wherein the resilient member is a spring.

6. The improved arteriovenous cannula of claim 5 wherein the resilient member is circular or rectangular in cross-section.

7. The improved arteriovenous cannula of any one of claims 1 to 4 wherein the deforming member is made of a metal having a memory function.