CN111658955B

CN111658955B - Improved medical cannula

Info

Publication number: CN111658955B
Application number: CN202010605098.9A
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: CN111658955A

Abstract

The invention discloses an improved medical intubation tube, 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 radial direction of the pipe body. 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 is prevented from collapsing in the using process, and the blood circulation is prevented from being blocked; meanwhile, the deformation holes in the deformation piece are arranged, so that the deformation piece has a deformation space, the bending performance of the pipe body is favorably improved, the flexibility is increased, the pipe body can better move forwards along the blood vessel, the risk of damaging the blood vessel by the pipe body can be reduced, and the control of a doctor is more favorably realized; the elastic support body has good elastic deformation performance, and solves the problems of difficult sleeving, inaccurate positioning and low production efficiency of conventional products.

Description

Improved medical cannula

Technical Field

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

Background

Medical cannulas (including arterial cannulas, venous cannulas, femoral arterial cannulas, femoral venous cannulas and the like) are frequently used in various surgeries requiring extracorporeal circulation, the traditional cannulas mainly comprise a tube sleeve, a spring arranged in the tube sleeve and a supporting 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 medical intubation tube, because the spring and the support sheet are required to be sleeved in the inner tube of the intubation tube, and the gap between the spring and the support sheet is very small, the elastic deformation performance of the conventional thin-wall support sheet is poor, so that the support 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 medical cannula.

The invention discloses an improved medical cannula, which comprises: the elastic supporting body is arranged in the tube body and comprises an elastic piece and a deformation piece, the elastic piece is abutted against the deformation piece, the deformation piece is radially provided with a deformation hole along the tube body, and the drainage hole is formed in a tube body section where the deformation piece is located (namely the drainage hole and the deformation piece are located in the same region of the tube 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 support piece is increased by applying expansion force to the inner periphery of the elastic support piece or applying stretching force to the outer periphery of the elastic support piece, the elastic support piece is sleeved conveniently in the production process, and the elastic support piece is loosened after the sleeve is arranged in place, so that the memory function of the elastic support piece can be recovered to the original state to realize fixation.

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 one embodiment of the present invention, the end deforming part includes a first connecting sub-part, a first supporting deforming sub-part and a second connecting sub-part which are connected in sequence, and the second connecting sub-part abuts against the elastic member.

According to an embodiment of the present invention, the first connection sub-piece, the first support deformation sub-piece, and the second connection sub-piece are integrally formed or assembled.

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 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 connected in sequence; the pipe body comprises an inner pipe and an outer pipe sleeved on the inner pipe, and the elastic piece and the deformation piece are sleeved on the inner pipe.

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 invention 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 is prevented from collapsing in the using process, 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 conventional products 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 medical cannula according to an embodiment;

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

FIG. 3 is another block diagram of an embodiment of an improved medical cannula;

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 deformable member; 221-end deformation tabs; 2211-first connector sub-piece; 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 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 practical 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 the first, the second, etc. in the present invention are only used for description purposes, do not particularly refer to an order or sequence, and do not limit the present invention, but only distinguish components or operations described in the same technical terms, and are not understood to indicate or imply relative importance or implicitly indicate the number of indicated technical features. 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 medical cannula in an embodiment; FIG. 2 is a block diagram of an embodiment of an improved medical cannula; fig. 3 is another block diagram of an improved medical cannula according to an embodiment. The improved medical intubation tube 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. The elastic support body 2 can be made of metal with memory function, such as nickel-titanium alloy, and has good elastic deformation performance. The elastic support body 2 comprises an elastic member 21 and a deformation member 22, the elastic member 21 and the deformation member 22 are all sleeved on the tube body 1, the elastic member 21 and the deformation member 22 are mutually abutted, and the drainage hole 3 is formed in a section of the tube body 1 where the deformation member 22 is located (namely, 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 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 in the radial direction of the pipe body 1. In addition, when the deformation hole 23 is formed at the distal end of the tube body 1, the deformation piece 22 is fitted from the end inlet without requiring a particularly large elastic deformation, and therefore the deformation hole 23 of the end section can be axially formed. 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.

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 made of TPU (Thermoplastic polyurethane elastomers), which improves 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 transverse direction of the first connection sub-piece 2211, the transverse direction is a direction parallel to the radial direction of the pipe body 1,

during production, by applying an expanding force or a stretching force to the inner circumference or the outer circumference of the end deformation piece 221 to increase the inner diameter, the connection portion (not shown) between the first connection sub-piece 2211 and the first support deformation sub-piece 2212 and the connection portion (not shown) between the first support deformation sub-piece 2212 and the second connection sub-piece 2213 are stretched, and the corresponding deformation holes 23 provide deformation spaces for the end deformation piece 221, so that the end deformation piece 221 can be conveniently sleeved into the inner tube 111, and can be restored to the original shape and fixed on the inner tube 111 after being in place.

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 in the figures) is disposed at a position where the second connecting sub-piece 2213 abuts against the elastic member 21, and since a blank exists at an ending section of the elastic member 21, the protruding portion is mainly used for filling the blank, that is, a longitudinal section of a connecting position of the second connecting sub-piece 2213 and the elastic member 21 is in a step shape; 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 distal end of the tube body 11, and since the initial pressing force is the largest at the distal end of the tube body 11 which enters the human body first, the tube body 1 needs to have a stronger supporting force, and thus 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 supporting hole 22121 has been seted up to first support deformation sub-piece 2212, and drainage hole 3 is located the same region of body 1 with first supporting hole 22121, and the diameter of first supporting 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 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 transverse 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, and the function of the protrusion is the same as that of 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 practical application, a plurality of middle deformation pieces 222 can be arranged according to the length of the pipe body 11 or the use requirement, so that the bending performance of the pipe body 1 is enhanced. 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 medical cannula is assembled, the elastic pieces 21 and the middle deformation pieces 222 are sleeved into the inner tube 111 at intervals, the end deformation piece 221 is sleeved into the far end of the inner tube 111, the outer tube 112 is sleeved and integrated through a thermoplastic process, then the drainage holes 3 are formed in the positions of the inner tube 111 and the outer tube 112 corresponding to the first supporting hole 22121 and the second supporting hole 22221, and finally the reducing joint 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 caving from appearing in the body in the use, lead to 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 performance of buckling of body, increase the flexibility, make that 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 conventional medical intubation products 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 medical cannula, comprising: the elastic support body is arranged in the pipe body and comprises an elastic piece and a deformation piece, the elastic piece is abutted against the deformation piece, the deformation piece is provided with a deformation hole along the radial 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 medical cannula according to claim 1, wherein said middle deformation piece comprises a third connection sub-piece, a second support deformation sub-piece and a fourth connection sub-piece connected in sequence, said third connection sub-piece and said fourth connection sub-piece both abutting against said elastic member.

3. The improved medical cannula according to 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 tube body.

4. The improved medical cannula according to claim 1, wherein said tube body comprises a tube body, a reducer union and a connector connected in sequence; the pipe body comprises an inner pipe and an outer pipe sleeved on the inner pipe, and the elastic piece and the deformation piece are sleeved on the outer pipe of the inner pipe.

5. An improved medical cannula according to any of claims 1-4, wherein said resilient member is a spring.

6. The improved medical cannula according to claim 5, wherein said resilient member is circular or rectangular in cross-section.

7. The improved medical cannula according to any of claims 1-4, wherein said deformable member is made of a metal having a memory function.