CN115430008A - Catheter sheath group convenient to operate - Google Patents

Abstract

The invention discloses a catheter sheath group convenient to operate, which comprises a sheath tube seat, wherein a catheter is sleeved in the sheath tube seat in a sliding manner, a guide wire is arranged in the catheter in a penetrating manner, the distal end of the catheter is a prestress section, the prestress section has a vortex state free from external force and a stress state in which the guide wire is arranged in a penetrating manner, and the prestress section is matched with the appearance of the guide wire in the stress state. According to the catheter sheath group convenient to operate, the catheter enters the opening of a coronary artery under the action of the guide wire, the prestress section at the far end of the catheter is in a stress state, namely a curve shape suitable for the shape of the guide wire, when the guide wire is withdrawn out of the sheath tube seat, the prestress section at the far end of the catheter is in a vortex state, compared with a straight state, the vortex state can be provided with more output holes in the same radiography area, and therefore more contrast agents can be output, and the catheter with a smaller size can be selected.

Description

Catheter sheath group convenient to operate

Technical Field

The invention relates to the technical field of medical equipment, in particular to a catheter sheath group convenient to operate.

Background

Coronary artery disease, that is, coronary heart disease is one of the most mortality diseases, coronary artery angiography technology is the main method for solving coronary heart disease, the coronary angiography step is performed by using a thin hair-like catheter to extend along the artificial entrance of the radial artery (at the wrist) or the femoral artery (at the thigh) to the coronary artery opening of the heart, and then contrast agent (developed under X-ray) is injected into the coronary artery, so that the internal morphology of the coronary artery can be displayed, for example, whether the coronary artery has stenosis, plaque and the like, but basically the internal morphology of the heart cannot be known through the examination, and the internal morphology of the coronary artery and the blood flow speed in the coronary artery are mainly known.

If the authorization notice number is CN105498067A, the publication date is 20/04/2016, and the name is 'Trans-radial artery coronary angiography catheter and using method thereof', the catheter is composed of a first catheter, a second catheter and a head catheter which are connected in three sections, wherein the first catheter is a straight tube, one end of the second catheter, which is connected with the first catheter, has two 135-degree bends, the end, which is connected with the head catheter, is vertical to the first catheter, the head catheter is integrally in a reverse S shape, and a side hole is arranged on the wall of the catheter, the catheter is characterized in that: the first catheter is of an outer layer structure, a middle layer structure and an inner layer structure, the inner layer structure and the outer layer structure are made of nylon materials, the middle layer structure is a metal woven net, the second catheter is made of nylon plastics, the head catheter is made of soft nylon, the radial coronary angiography catheter is formed by connecting three sections of catheters with gradually reduced hardness, the first catheter is composed of nylon and the metal woven net, the flexibility of the catheter is improved while the catheter is kept to be well supported, the torque conducting capacity of the catheter is better in the operation process, the controllability is good, and the catheter can enter coronary arteries more easily. The head catheter is made of soft nylon, is soft in structure, can reduce the injury of the head end of the catheter to a blood vessel in the coronary artery entering process and the radiography process, adopts the structural design of 'reverse S' and is easier to enter the right coronary artery, so that the right coronary artery is prevented from being branched, and serious complications are avoided. The second conduit is used as a connecting transition section of the first conduit and the head conduit and is made of nylon plastics with moderate hardness. The use method of the radial artery coronary angiography catheter utilizes the guiding function of the sheath tube seat and the guide wire on the coronary angiography catheter, and the catheter can easily enter the coronary artery, thereby reducing the operation difficulty and the operation complication.

The operating method of the prior art of the cardiac angiography operation is that firstly, a guide wire is fed into a blood vessel of a human body to a coronary artery opening of a heart through a sheath catheter seat, then a catheter is guided by the guide wire to be directed to the coronary artery opening of the heart, and then the guide wire is withdrawn, so that the blood vessel in the heart is tortuous and the blood vessel wall is thin, the blood vessel wall can be damaged in the process that the catheter enters the heart along the guide wire, obviously, the damage possibly caused by the thicker catheter is larger, the serious patient can cause blood vessel perforation, and great difficulty is caused in the operation. So the thinner catheter is better when possible, but on the other hand, the catheter is used to deliver contrast agent to the contrast area, which is not large (e.g. hemangioma), and the thinner catheter in the limited space can deliver limited contrast agent, thereby affecting the contrast effect, based on which the prior art needs to select the thinnest catheter while meeting the delivery requirement of contrast agent in the limited space.

Disclosure of Invention

The invention aims to provide a catheter sheath set convenient to operate so as to solve the defects in the prior art.

In order to achieve the above purpose, the invention provides the following technical scheme:

the utility model provides a pipe sheath group convenient to operation, includes the sheath tube socket, it has the pipe to slide endotheca in the sheath tube socket, wear to be equipped with the seal wire in the pipe, the distal end of pipe is prestressing force section, prestressing force section has the vortex state that does not receive external force and wears to be equipped with the stress state of seal wire under the stress state, prestressing force section adaptation in the appearance of seal wire.

In the catheter sheath set convenient to operate, the prestress section is provided with a plurality of liquid discharging holes.

Foretell catheter sheath group convenient to operation is provided with first recess on the inner wall of sheath tube socket, first recess is the circular form recess of adaptation sheath tube socket inner wall, the cell body that first recess circumference length has one-third circular arc is for sealing the form, and the rotation of first recess internal rotation is connected with the elastic ring, it makes to seal the form cell body the amplitude of rotation of elastic ring is no longer than 240 degrees.

The above catheter sheath assembly convenient to operate comprises an elastic inner ring and an elastic outer ring, the elastic outer ring is elastically sleeved on the elastic inner ring, the elastic inner ring is sleeved on the near end of the catheter, a plurality of blocks are circumferentially arranged on the elastic outer ring, a plurality of second grooves are formed in the blocks, the intervals of the second grooves are equal, a raised annular portion is arranged on the elastic inner ring, and the raised annular portion corresponds to the second grooves one to one.

In the above-mentioned catheter sheath set for easy operation, the elastic inner ring has an axial extension portion through which the elastic inner ring protrudes outside the sheath hub.

In the catheter sheath group convenient to operate, the rotation of the catheter drives the elastic inner ring to rotate, and the elastic inner ring drives the elastic outer ring to rotate.

In the catheter sheath group convenient to operate, the groove wall of the first groove is extruded to be tightly attached to the elastic outer ring, the extending part of the elastic inner ring extending out of the sheath tube seat is rotated, and the elastic inner ring rotates to enable the protruding annular part on the elastic inner ring to pass through the second groove on each block body so as to realize the adjustment of the inner diameter of the elastic inner ring.

In the above catheter sheath assembly for easy operation, four blocks are circumferentially arranged on the elastic outer ring.

In the catheter sheath assembly convenient to operate, the block body is provided with three second grooves.

In the catheter sheath assembly for easy operation, the second groove is an annular groove.

In the above technical solution, according to the catheter sheath set convenient to operate provided by the embodiment of the present invention, the catheter enters the coronary artery opening under the action of the guide wire, and at this time, the pre-stressed section at the distal end of the catheter is in a stressed state, that is, in a curved shape adapted to the shape of the guide wire, and when the guide wire is retracted out of the sheath tube base, the pre-stressed section at the distal end of the catheter is in a vortex state, compared with a linear state, the vortex state can open more output holes in the same contrast region, so as to output more contrast media, and thus, it is possible to select a catheter with a smaller size.

Drawings

In order to more clearly illustrate the embodiments of the present application or technical solutions in the prior art, the drawings required in the embodiments will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present invention, and other drawings can be obtained by those skilled in the art according to these drawings.

FIG. 1 is a schematic view of a catheter sheath set for ease of operation provided by an embodiment of the present invention;

FIG. 2 is a structural schematic view of the catheter sheath assembly pre-stressed in a stressed state for ease of operation provided by an embodiment of the present invention;

FIG. 3 is a structural schematic view of the catheter sheath assembly pre-stressed in a swirling state for ease of operation provided by an embodiment of the present invention;

FIG. 4 is a schematic structural view of a catheter sheath set for ease of operation according to yet another embodiment of the present invention;

FIG. 5 is a partial cross-sectional view of a catheter sheath set for ease of operation according to yet another embodiment of the present invention;

FIG. 6 is a schematic view of the inner and outer resilient rings of a catheter sheath assembly in accordance with yet another embodiment of the present invention;

FIG. 7 is a schematic view of the mating of a second groove and raised annular portion provided by yet another embodiment of the present invention.

Description of reference numerals:

1. a guide wire; 2. a conduit; 3. a sheath seat; 4. a prestressing segment; 5. a first groove; 6. a boss portion; 7. an elastic ring; 8. an elastic inner ring; 9. an elastic outer ring; 10. a raised annular portion; 11. a block body; 12. a second groove.

Detailed Description

In order to make the technical solutions of the present invention better understood, those skilled in the art will now describe the present invention in further detail with reference to the accompanying drawings.

In embodiments of the invention where "proximal" and "distal" are relative orientations, relative positions, directions of elements or actions with respect to one another from the perspective of a clinician using the medical device, although "proximal" and "distal" are not intended to be limiting in scope, proximal "generally refers to the end of the medical device that is closer to the clinician during normal operation, and distal generally refers to the end that is further from the clinician first into the patient, the intended forward and reverse rotations are not rotations in the colloquial sense, but rather rotations in two opposite directions.

Referring to fig. 1 to 7, the catheter sheath set convenient to operate provided by the embodiment of the present invention includes a sheath tube base 3, a catheter 2 is slidably sleeved in the sheath tube base 3, a guide wire 1 is slidably sleeved in the catheter 2, a distal end of the catheter 2 is a pre-stress section 4, the pre-stress section 4 has a vortex state free from an external force and a stress state in which the guide wire 1 is inserted, and in the stress state, the pre-stress section 4 is adapted to an outer shape of the guide wire 1.

Specifically, as shown in fig. 1, a distal end (i.e. an end entering a human body) of the sheath base 3 is used for being placed in an artery, a proximal end of the sheath base 3 is located outside the body, an axial through hole for the catheter 2 to enter an arterial blood vessel is formed inside the sheath base 3, a guide wire 1 is further inserted into the catheter 2, the catheter 2 enters a lesion from the human blood vessel in a guiding direction of the guide wire 1, then the guide wire 1 is retracted, a contrast medium is injected to the lesion through the catheter 2, a distal end of the catheter 2 is a pre-stressed section 4, the pre-stressed section 4 refers to a section which is pre-stressed during manufacturing and has elasticity so that the section is in a vortex shape, i.e. an inward roll shape, the catheter 2 in the prior art is all linear or substantially linear, in the embodiment, the distal end of the guide wire 1 is prestressed during manufacturing on the basis that the whole guide wire 1 is straight, so that the guide wire 1 is arranged in a vortex shape, but the prestress is small, or the elastic coefficient of the prestress section 4 is small, when the guide wire 1 penetrates through the catheter 2 and the guide wire 1 is positioned in the prestress section 4, the hardness or the elastic coefficient of the guide wire 1 is larger than that of the prestress section 4, so that when the guide wire penetrates into the catheter 2, the prestress section 4 is in a stressed state, the guide wire 1 applies pressure to the catheter 2 to force the prestress section 4 to be matched with the trend of the guide wire, for example, the guide wire 1 is straight, and when the guide wire 1 is withdrawn from the prestress section 4, the prestress section 4 loses pressure, and is in a vortex state. In a stress state, the prestressed section 4 is inside the guide wire 1, and the elastic coefficient of the prestressed section 4 is smaller than that of the guide wire 1, and the prestressed section 4 is adapted to the shape of the guide wire 1, for example, the guide wire 1 is linear, and the prestressed section 4 is also linear, and in a vortex state, the prestressed section 4 is not affected by an external force and is naturally bent into a vortex shape. In the embodiment, the prestress section 4 is provided with a plurality of drainage holes, in the operation process, a vortex formed by the prestress section 4 is arranged at a position for releasing the contrast agent, then the contrast agent is synchronously output from the drainage holes through the conduit 2, the vortex structure can be provided with more drainage holes in the same area, and more contrast agents which accord with the output speed are conveyed in a unit area by increasing the flow speed of liquid in the conduit; moreover, when the contrast agent is released, because the prestressed section 4 has elasticity, the prestressed section 4 has a swinging action during the releasing process under the impact of the contrast agent, and the contrast agent with high concentration can be more uniformly distributed to the contrast area.

According to the catheter sheath group convenient to operate, the catheter enters the coronary artery opening under the action of the guide wire, the prestress section at the far end of the catheter is in a stress state, namely a curve shape suitable for the shape of the guide wire, when the guide wire is withdrawn out of the sheath tube seat, the prestress section at the far end of the catheter is in a vortex state, compared with a straight line state, more output holes can be formed in the same radiography area in the vortex state, and therefore more contrast agents can be output, and the catheter with a smaller model can be selected.

In one embodiment of the present invention, as shown in fig. 3, the pre-stress segment 4 is provided with a plurality of drainage holes (not shown), through which contrast medium can be injected into the lesion of the coronary artery, in the prior art, the catheter selection during the contrast operation is generally a 4F catheter and a 5F catheter, compared with the 4F catheter 2 and the 5F catheter 2,4F catheter, the small-caliber catheter 2 has the advantages of less damage to the blood vessel, especially in the radial artery (wrist), the blood vessel of the radial artery is thinner than other blood vessels in the human body, the 4F catheter, that is, the small-caliber catheter can reduce the spasm of the radial artery and the blood vessel damage of the radial artery, the 5F catheter has the advantages of larger caliber but larger damage to the blood vessel, the contrast medium injected into the lesion by the 5F catheter 2 in the same lesion and the same period of time can be larger than the contrast medium injected into the lesion by the 4F catheter, in the contrast medium region, the catheter 2 with a linear distal end has a limited opening, and the 4F catheter 2 outputs a significantly smaller amount of contrast medium than the 5F catheter 2, which may be difficult for some patients to achieve satisfactory contrast effect, in the present embodiment, the pre-stressed section 4 is provided with a plurality of drainage holes through which contrast medium can be injected into coronary artery, the pre-stressed section 4 is provided with a plurality of drainage holes in order to provide the distal end of the catheter with more contrast medium inlets than the catheter at the linear end, so that the 4F catheter can also provide the same or similar amount of contrast medium as the 5F catheter 2, and the contrast medium is instantly flushed out of the catheter into the lesion, the pre-stressed section 4 will be forced to swing during flushing out of the contrast medium, at this time, the lesion area can be displayed to be larger and the specific condition of the lesion can have a clear response, the advantage of providing the drainage holes in the prestressed section 4 is that a small-diameter catheter can be selected during the radiography operation, and a good radiography effect can be achieved.

In another embodiment of the present invention, as shown in fig. 4 and 5, a first groove 5 is disposed on an inner wall of the sheath tube holder 3, the first groove 5 is an arc-shaped groove adapted to the inner wall of the sheath tube holder 3, that is, the first groove is not a complete annular groove, if the circumferential length of the first groove is two thirds of an arc, and a portion of the other corresponding third of the arc is closed, an elastic ring 7 is rotatably connected in the sheath tube holder 3, the elastic ring 7 is made of an elastic material, the elastic ring 7 is also a circular shape adapted to the outer shape of the catheter 2, the radial dimension of the elastic ring 7 is configured to be elastically sleeved on the catheter 2, that is, the radial dimension of the inner wall of the elastic ring 7 is smaller than the radial dimension of the outer wall of the catheter 2, so that the elastic ring 7 can rotate in the same direction when the catheter 2 is rotated by a doctor, a protrusion 6 is further disposed on the elastic ring 7, the protrusion 6 is movably connected in the first groove 5, the catheter 2 drives the elastic ring 7 to rotate when rotating, when the elastic ring 7 rotates, the protrusion 6 is driven to rotate in the groove, and the protrusion 6 on the elastic ring 7 is also driven to rotate in the rotation process of the catheter 2, obviously, when the protrusion 6 rotates to the end part closed by the first groove 5, the end part closed by the first groove 5 can block the protrusion 6 so that the protrusion can not rotate due to the rotation resistance, the doctor can know that the catheter 2 is subjected to the rotation resistance, the doctor can rotate the catheter 2 in the opposite direction for a plurality of angles and then rotate the catheter in the positive direction, so that the catheter 2 can continuously enter or exit the blood vessel of the human body, the closed one-third arc corresponding to the first groove 5 can limit the rotation amplitude of the elastic ring 7, so that the first groove limits the rotation amplitude of the catheter, in the prior art, the operation step of feeding or withdrawing the catheter from the blood vessel of the human body is to rotate in the other direction after rotating for a period of time, in practice of a plurality of doctors, it is concluded that the rotation amplitude cannot exceed 240-270 degrees, otherwise the catheter 2 is easily broken to damage blood vessels, when the doctor repeatedly rotates and feeds or withdraws the catheter 2, the rotation amplitude cannot exceed 240 degrees once, in actual operation, the amplitude of each forward rotation is inconsistent with that of each reverse rotation, so that a certain accumulated rotation amplitude is obtained after each rotation, through training and working experience, the angle of each forward rotation or reverse rotation is possibly not different greatly, for example, the angle of each forward rotation or reverse rotation is only 60 degrees after each forward rotation of 70 degrees, but due to the overlong length of the catheter, the accumulated rotation amplitude of the catheter at the tail end of the operation may exceed 270 degrees, so that the catheter 2 is damaged, so that a closed section is arranged in the first groove, the protruding part on the elastic ring is subjected to rotation resistance during rotation, so that an operator knows that the accumulated rotation amplitude is too large, at this time, the catheter can be reversely rotated, the protruding part 6 can be at any position in the first groove 5 initially, and the catheter 2 can be fed or withdrawn in the human body by repeated operation.

In a further embodiment, one end of the protruding portion 6 is connected to a micro-protrusion in the middle of the arc of the groove wall of the first groove 5 through a tearing portion, the tearing portion is of a structure with connection strength smaller than that of the protruding portion 6, for example, the thickness is half to one third of the protruding portion, the tearing portion is easy to tear, the effect is that the elastic ring 7 is directly connected to the middle of the first groove 5 through the protruding portion 6 in an initial state, the positioning is convenient, the elastic ring 7 cannot rotate by itself, then, when the elastic ring 7 is rotated by force to break the tearing portion, the connection force of the tearing portion is small, the tearing portion is easy to break, and in the using process, the tearing portion of the protruding portion 6 has an obvious click feeling when passing through the micro-protrusion every time, at the moment, a doctor can sense, the doctor is reminded that the middle position of the rotation stroke should be achieved here, and the probability that the protruding portion 6 rotates to the limit position is reduced.

In another embodiment of the present invention, as shown in fig. 6, the elastic ring 7 includes an elastic inner ring 8 and an elastic outer ring 9, the elastic outer ring 9 is sleeved in the first groove 5, the elastic outer ring 9 is elastically sleeved on the elastic inner ring 8, the elastic inner ring 8 is elastically sleeved on the catheter 2, the distal end of the elastic inner ring 8 extends to the outside of the sheath tube seat 3, a plurality of blocks 11 are circumferentially disposed on the inner wall of the elastic outer ring 9, preferably, four blocks 11 are circumferentially disposed on the elastic outer ring 9, and the blocks 11 are in a triangular (circumferentially having three faces) configuration, one face of which is attached to the inner wall of the outer ring, the other face is an inclined face, the other face is a radial face, a plurality of second grooves 12 are disposed on the inclined face of the blocks 11 and the second grooves 12 have elasticity, preferably, three second grooves 12 are disposed on one block 11, the second grooves 12 are in the shape of an annular groove, the elastic annular protrusion 10 is disposed on the elastic inner ring 8 and made of soft elastic material, preferably, the annular protrusion 10 is in the shape of an annular protrusion 10, and the annular protrusion 10 is in the same size as the elastic groove 12, when the elastic inner ring 8 rotates, the elastic ring 10 is not blocked by the elastic inner ring 8, and the elastic ring 12, when the elastic ring 8, the elastic ring 10 is rotated, the elastic ring 10, the elastic ring 8, the elastic ring 10 is not rotated in the same size, the required inner diameters of the catheters 2 are different, so that the size of the inner ring of the catheter 2 with different calibers can be adjusted by providing a rotatable inner ring, when the protruding ring part 10 passes through three annular grooves, the corresponding inner diameters of the catheters 2 are different, correspondingly, the groove wall of the relative position of the sheath tube seat 3 and the elastic outer ring 9 is made of elastic material, namely when the doctor needs to adjust, the doctor presses the groove wall of the elastic material on the sheath tube seat 3 by one hand to tightly fit the elastic outer ring 9 to limit the elastic outer ring 9, then the other hand only needs to rotate the extending part of the elastic inner ring 8 extending out of the sheath tube seat 31, the elastic inner ring 8 rotates to enable the protruding ring part 10 on the elastic inner ring to pass through each annular groove to adjust the inner diameter of the catheters 2 with different radial sizes, such as the catheters 3F-5F.

Further, as shown in fig. 7, the extending direction of the second groove 12 is the axial position of the catheter and the sheath base 1, the protruding annular portion 10 is configured as a half-boss structure, the radial dimension of the half-boss structure, that is, the protruding annular portion 10, gradually decreases from one end to the other end along the axial direction of the elastic inner ring 8, the axial dimension of the half-boss structure is more than three times the axial dimension of the second groove 12, and in the initial position, the half-boss structure is inserted into the second groove 12 with the middle portion thereof, so that the axial pulling of the elastic inner ring 8 makes the portion thereof matching the second groove 12 larger or smaller, so that for each catheter 2, the axial pulling of the inner ring can finely adjust the radial dimension of the elastic inner ring 8, that is, the magnitude of the friction force between the elastic inner ring 8 and the catheter can be adjusted, so that the doctor can adjust the pulling resistance of the catheter 2 relative to the elastic inner ring 8 within a certain range.

While certain exemplary embodiments of the present invention have been described above by way of illustration only, it will be apparent to those of ordinary skill in the art that the described embodiments may be modified in various different ways without departing from the spirit and scope of the invention. Accordingly, the drawings and description are illustrative in nature and should not be construed as limiting the scope of the invention.

Claims (10)

1. The utility model provides a pipe sheath group convenient to operation, includes the sheath tube socket, it has the pipe to slide endotheca in the sheath tube socket, wear to be equipped with the seal wire in the pipe, its characterized in that, the distal end of pipe is prestressing force section, prestressing force section has the vortex state that does not receive external force and wears to be equipped with the stress state of seal wire under the stress state, prestressing force section adaptation in the appearance of seal wire.

2. The catheter sheath assembly of claim 1 wherein the pre-stressed section is provided with a plurality of weep holes.

3. The easy-to-operate catheter sheath set as claimed in claim 1, wherein the inner wall of the sheath seat is provided with a first groove, the first groove is a circular groove adapted to the inner wall of the sheath seat, the groove body of which the circumferential length is one third of a circular arc is closed, an elastic ring is rotatably connected in the first groove, and the closed groove body enables the rotation amplitude of the elastic ring not to exceed 240 degrees.

4. The easy-to-operate catheter sheath assembly of claim 3, wherein the elastic ring comprises an elastic inner ring and an elastic outer ring, the elastic outer ring is elastically sleeved on the elastic inner ring, the elastic inner ring is sleeved on the proximal end of the catheter, a plurality of blocks are circumferentially arranged on the elastic outer ring, a plurality of second grooves are arranged on the blocks, the intervals between the plurality of second grooves are equal, a raised annular portion is arranged on the elastic inner ring, and the raised annular portion and the second grooves are in one-to-one correspondence.

5. The catheter sheath set of claim 4, wherein the resilient inner ring has an axial extension through which the resilient inner ring protrudes outside the sheath hub.

6. The easy-to-operate introducer sheath set of claim 5, wherein the rotation of the catheter rotates the inner flexible ring, which rotates the outer flexible ring.

7. The easy-to-use catheter sheath assembly of claim 6 wherein the slot walls of the first groove are squeezed to tightly fit the resilient outer ring, rotating the extension of the resilient inner ring that extends beyond the sheath seat, the resilient inner ring rotating such that the raised annular portion on the resilient inner ring passes through the second groove on each of the blocks to effect adjustment of the inner diameter of the resilient inner ring.

8. The catheter sheath set of claim 7 wherein the elastomeric outer ring has four blocks disposed circumferentially thereon.

9. The catheter sheath set for facilitating manipulation of claim 8, wherein three second grooves are provided on the block.

10. The catheter sheath assembly of claim 9, wherein the second recess is an annular groove.

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