CN118045273A - Guiding and extending catheter - Google Patents
Guiding and extending catheter Download PDFInfo
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- CN118045273A CN118045273A CN202410156986.5A CN202410156986A CN118045273A CN 118045273 A CN118045273 A CN 118045273A CN 202410156986 A CN202410156986 A CN 202410156986A CN 118045273 A CN118045273 A CN 118045273A
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Abstract
The invention provides a guiding and extending catheter which comprises a pushing component, a connecting catheter, a catheter main body and a noninvasive distal end which are sequentially connected from a proximal end to a distal end, wherein a first developing ring is sleeved at one end, close to the catheter main body, of the connecting catheter, and a second developing ring is sleeved at one end, close to the noninvasive distal end, of the catheter main body. According to the guiding extension catheter provided by the embodiment of the invention, the first developing ring is sleeved on the connecting catheter, the second developing ring is sleeved on one side of the distal end of the catheter main body, and the imaging observation is carried out on the lesion part of the opening through the catheter main body part between the first developing ring and the second developing ring and the noninvasive distal end on the connecting catheter, so that the observable length of the catheter on the lesion part of the opening in multi-mode imaging such as optical imaging, optical-acoustic imaging and the like can be improved under the condition of less contrast agent flushing.
Description
Technical Field
The invention relates to the technical field of medical instruments, in particular to a guiding and extending catheter.
Background
PCI (percutaneous coronary intervention, PCI) surgery refers to a treatment method for dredging a stenosed or even occluded coronary lumen by catheter technology, thereby improving blood perfusion of cardiac muscle, while intravascular optical coherence tomography (Intravascular optical coherence tomography, IVOCT) technology, near infrared fluorescence imaging (NIRF), near infrared spectroscopy (NIRS) and other optical imaging means are the means of choice in the process of performing coronary intervention precision diagnosis and treatment due to their high resolution, molecular specificity characteristics.
When the optical imaging means is used for imaging operation, in order to achieve better imaging quality, the blood in the coronary blood vessel needs to be flushed with contrast medium which is filled, so that the influence of the blood on the imaging quality is reduced. However, when dealing with an open lesion, since the caliber of the coronary artery trunk is large, in order to reduce the dosage of the contrast agent, a guide catheter or an extension catheter needs to be properly inserted into the coronary artery opening and closely contacted with the coronary artery opening, but the guide catheter or the extension catheter in the prior art cannot image and observe the open lesion at the shielding part of the catheter due to the shielding effect of the guide catheter on infrared light, so that the observable length of the open lesion is reduced.
Disclosure of Invention
In view of this, the present invention provides a guiding elongate catheter that can increase the observable length of the catheter over open lesions in optical imaging and in multi-modality imaging such as optical-acoustic with less flushing of contrast agents.
In order to solve the technical problems, the invention adopts the following technical scheme:
the guiding and extending catheter according to the embodiment of the invention comprises a pushing component, a connecting catheter, a catheter main body and a non-invasive distal end which are sequentially connected from the proximal end to the distal end,
The catheter body is provided with a first developing ring and a second developing ring, and the first developing ring is sleeved at one end of the connecting catheter, which is close to the non-invasive distal end, and the second developing ring is sleeved at one end of the connecting catheter, which is close to the catheter body.
Further, the connecting conduit comprises an entrance ramp near the proximal end and a connecting pipe body connected with the entrance ramp,
The first developing ring is sleeved on the connecting pipe body.
Further, the pipe walls of the entrance ramp and the connecting pipe body comprise an inner layer and an outer layer,
The inner layer is selected from one of Polytetrafluoroethylene (PTFE) or Fluorinated Ethylene Propylene (FEP),
The outer layer is selected from transparent Polytetrafluoroethylene (PTFE), polyamide (PA), polyethylene (PE) or polyether block polyamide Polymer (PEBAX).
Further, the pipe wall of the catheter main body is of a three-layer transparent structure, an inner layer, a structural reinforcing layer and an outer layer are sequentially arranged from inside to outside, the acoustic impedance difference between adjacent layers of the inner layer, the structural reinforcing layer and the outer layer is 0-1, and the length of the catheter main body is 5-30cm.
Further, the inner layer of the catheter main body is selected from one of transparent Polytetrafluoroethylene (PTFE) or Fluorinated Ethylene Propylene (FEP), the thickness of the inner layer is 10-40 mu m, the acoustic impedance is 2.5-3.2, and the light transmittance is more than 85%;
The inner wall of the inner layer of the catheter body is also coated with an inert low friction material.
Further, the structure reinforcing layer of the catheter body is formed in a wrap spring structure along a length direction of the catheter body,
The pitch of the wrap spring increases gradually in the direction from the proximal end to the distal end and the material diameter of the wrap spring decreases gradually,
The winding spring is selected from one of polycarbonate, composite nylon, acrylic or a hypotube, wherein the polycarbonate, the composite nylon and the acrylic are made of transparent materials, the acoustic impedance is 2-3, and the light transmittance is more than 85%.
Further, the outer layer of the catheter body comprises a proximal rigid polymer guard and a distal flexible polymer guard, the rigid guard having a length of 2-5cm and the flexible guard having a length of 3-25cm.
Further, the outer layer of the catheter body is selected from one of transparent Polyethylene (PE), polyamide (PA), polyether block polyamide Polymer (PEBAX) or Polytetrafluoroethylene (PTFE), has an acoustic impedance of 2-3.2, and has a light transmittance of >85%, and an inert hydrophilic coating is further coated on the outer wall of the outer layer of the catheter body.
Further, the pushing assembly comprises an operation handle and a pushing guide wire connected with the operation handle from a proximal end to a distal end, wherein the pushing guide wire penetrates through the connecting catheter to be connected with the structural reinforcement layer of the catheter main body, the cross section of the pushing guide wire is cylindrical and semi-cylindrical in sequence from the proximal end to the distal end, and the diameter of the cylinder is reduced in sequence.
Further, the non-invasive distal end is selected from one of flexible transparent Polyethylene (PE), polyamide (PA) or polyether block polyamide Polymer (PEBAX), and the length of the non-invasive distal end is 2-11mm.
The technical scheme of the invention has at least one of the following beneficial effects:
According to the guiding and extending catheter disclosed by the embodiment of the invention, the catheter main body is pushed to the coronary artery opening lesion position by the pushing component at the proximal end, the first developing ring is sleeved on the connecting catheter, the second developing ring is sleeved on one side of the distal end of the catheter main body, and the opening lesion part is imaged and observed by the catheter main body part between the first developing ring and the second developing ring on the connecting catheter and the noninvasive distal end, so that the observable length of the opening lesion is effectively improved.
In addition, the non-invasive distal end is connected to the distal end of the catheter main body of the guiding and extending catheter according to the embodiment of the invention, so that the safety of the delivery of the catheter main body in the coronary artery is improved.
Furthermore, the guiding and extending catheter can reduce the influence of the material on the intra-vascular phase tomography imaging, the fluorescence imaging, the two-photon imaging, the fluorescence lifetime imaging and other optical related imaging due to the optical absorption and scattering reasons by selecting the infrared transparent material with the refractive index similar to that of the contrast agent as the main material of the catheter body, so that a series of optical imaging can be carried out on the part of the catheter body overlapped with the opening by using the reflux of the contrast agent.
Further, the structure reinforcing layer in the catheter main body of the invention has the screw pitch gradual change winding spring structure, the influence of the catheter main body structure on light is minimized, the gradual increase of the screw pitch ensures the stability and the feasibility of the overall structure of the catheter main body, and meanwhile, at the position close to the noninvasive distal end, the increase of the screw pitch and the reduction of the winding spring width weaken the shielding and scattering effects of the winding spring structure on light and sound.
In addition, the invention reduces the multiple reflection of the ultrasonic wave in the catheter main body by adjusting the acoustic impedance matching of the inner layer, the structure reinforcing layer and the outer layer of the catheter main body, thereby improving the imaging quality when the multi-mode imaging catheter is used.
Drawings
FIG. 1 is a schematic view of a guiding and extending catheter according to an embodiment of the present invention;
FIG. 2 is a schematic view showing the structure of a catheter body of a guiding and extending catheter according to an embodiment of the present invention;
FIG. 3 is a schematic view of a structural reinforcement layer of a catheter body according to an embodiment of the present invention;
FIG. 4 is a schematic illustration of the connection of a guiding catheter to a guiding catheter according to an embodiment of the present invention;
FIG. 5 is a schematic view showing the structure of a duct of a guiding and extending catheter according to an embodiment of the present invention;
FIG. 6 is a schematic view of a pusher wire for guiding an elongate catheter according to an embodiment of the present invention;
FIG. 7 is a schematic illustration of the delivery of a guide extension catheter of an embodiment of the present invention to a lesion site through a guide catheter;
FIG. 8 is a schematic view of an embodiment of a guide extension catheter of the present invention entering an open lesion site;
fig. 9 is a schematic illustration of OCT imaging within a guide extension catheter according to an embodiment of the present invention.
Reference numerals: 100. a pushing assembly; 110. an operation handle; 120. pushing the guide wire;
200. A connecting conduit; 210. an entrance ramp; 220. a connection pipe body; 221. an inclined end face; 230. a duct;
300. A catheter body; 310. a rigid polymer protection portion; 320. a flexible polymer protection portion; 330. an inner layer; 340. a structural reinforcement layer; 350. an outer layer;
400. A non-invasive distal end;
500. A first developing ring; 600. a second developing ring; 700. a guide catheter;
800. Coronary arteries; 810. the front end of the branch; 820. branching; 830. the rear end of the branch; 840. opening lesions;
Oct catheter;
1000. A contrast agent.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. It will be apparent that the described embodiments are some, but not all, embodiments of the invention. All other embodiments, which are obtained by a person skilled in the art based on the described embodiments of the invention, fall within the scope of protection of the invention.
Unless defined otherwise, technical or scientific terms used herein should be given the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The terms "first," "second," and the like, as used herein, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. The terms "connected" or "connected," and the like, are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", etc. are used merely to indicate a relative positional relationship, which changes accordingly when the absolute position of the object to be described changes.
A guide extension catheter according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.
A guiding elongate catheter according to an embodiment of the present invention, as shown in fig. 1, comprises a push assembly 100, a connecting catheter 200, a catheter body 300, and a atraumatic distal end 400 connected in sequence from the proximal end to the distal end.
Wherein, the first developing ring 500 is sleeved at one end of the connecting catheter 200 adjacent to the catheter main body 300, and the second developing ring 600 is sleeved at one end of the catheter main body 300 adjacent to the non-invasive distal end 400, and the distance between the second developing ring 600 and the non-invasive distal end 400 is 2-3mm.
That is, according to the guide extension catheter of the embodiment of the present invention, the catheter body 300 is pushed to the coronary artery opening lesion position by the pushing assembly 100 of the proximal end, the first developing ring 500 is disposed on the connecting catheter 200, the second developing ring 600 is disposed at the distal end side of the catheter body 300, and the opening lesion portion is imaged and observed by the catheter body 300 portion between the first developing ring and the second developing ring on the connecting catheter and the noninvasive distal end 400, so that the length of the first developing ring 500 sleeved on the connecting catheter 200 and/or the second developing ring 600 sleeved on the distal end of the catheter body 300 can be increased without affecting the imaging quality, and the observable length of the opening lesion can be effectively improved. In addition, the non-invasive distal end 400 is connected to the distal end of the catheter body 300, improving the safety of the catheter body 300 delivery in the coronary artery.
As one example, the length of the tube formed by connecting catheter 200, catheter body 300, and atraumatic distal end 400 may be set to 150-180cm, with an inner diameter of 1.4-2mm, for example, wherein catheter body 300 is used to deliver related instruments and medications. Because the length of the existing extension catheter is longer, and the intravascular imaging catheter is generally of a variable diameter structure, the diameter of the intravascular imaging catheter is larger as the intravascular imaging catheter is closer to the proximal end, and when the intravascular imaging catheter and the parallel guide wires are fed into the extension catheter together at the position close to the proximal end, the resistance is larger due to the fact that the diameter of the imaging catheter is larger, meanwhile, the passing space of contrast medium is reduced, the resistance for injecting the contrast medium is too high, and the contrast efficiency is reduced. In contrast, the guiding extension catheter of the embodiment of the invention effectively reduces the length of the catheter body and improves the pushing capacity of intravascular imaging catheters such as IVOCT imaging catheters in the extension catheter.
Preferably, the first developing ring 500 and the second developing ring 600 may be made of platinum iridium material, and the observability under contrast may be improved by increasing the length of the developing rings without affecting the imaging quality.
Preferably, the non-invasive distal end 400 has a length of 2-11mm and is made of a soft polymer made by TruFlex technology, the material is selected from one of flexible transparent Polyethylene (PE), polyamide (PA) or polyether block polyamide Polymer (PEBAX), thereby improving the flexibility of guiding the elongate catheter and having a better transmission effect for light in the near infrared band.
In some embodiments, as shown in FIG. 1, connecting conduit 200 includes an entry ramp 210 near the proximal end and a connecting tube 220 connected to entry ramp 210.
Wherein the entrance ramp 210 is formed in a spade shape by an arc shape, an end surface of the connection pipe body 220, to which one end of the entrance ramp 210 is connected, is formed as an inclined end surface 221 inclined obliquely upward, and the first developing ring 500 is sleeved on the connection pipe body 220.
That is, the connection catheter 200 is configured to include the entrance ramp 210 near the proximal end and the connection pipe 220 connected to the entrance ramp 210, wherein the entrance ramp 210 is configured to be a spade shape, so that scratch of objects such as a stent or a drug during the transfer process in the pipe can be reduced, transportation is facilitated, the length of the first developing ring 500 is consistent with that of the connection pipe 220, the first developing ring 500 is sleeved on the connection pipe 220, and the first developing ring 500 is configured to be a shape of the connection pipe 220, so that the supportability of a portion of the connection pipe 220 can be further improved.
Preferably, the length of the entrance ramp 210 is 3-5cm and the length of the connection pipe 220 is 2-5mm.
In some embodiments, the walls of both entrance ramp 210 and connecting pipe 220 include an inner layer selected from one of low friction coefficient Polytetrafluoroethylene (PTFE) or Fluorinated Ethylene Propylene (FEP) and an outer layer selected from one of optically clear Polyamide (PA), polyethylene (PE), polytetrafluoroethylene (PTFE) or polyether block Polyamide Polymer (PEBAX) processed using TruFlex technology. The inner layer material has low friction coefficient, is favorable for conveying equipment and/or medicines, has better transmission effect on near infrared band light, and can further improve the observation effect.
In some embodiments, as shown in fig. 2, the wall of the catheter body 300 is a three-layer transparent structure, which is composed of an inner layer 330, a structural reinforcing layer 340 and an outer layer 350 in order from inside to outside, the acoustic impedance difference between adjacent layers of the inner layer 330, the structural reinforcing layer 340 and the outer layer 340 is 0-1, and the length of the catheter body 300 is 5-30cm.
Therefore, the catheter main body 300 is designed into a transparent structure, so that the catheter main body 300 can conveniently extend into coronary artery to image, the observable length of the open lesions is improved, the catheter wall part is composed of the three-layer structure of the inner layer 330, the structure reinforcing layer 340 and the outer layer 350, the structural strength of the catheter main body 300 is effectively improved, and the service life is prolonged.
In addition, acoustic impedances between adjacent layers of the inner layer 330, the structural reinforcement layer 340, and the outer layer 350 of the catheter body 300 are matched to reduce multiple reflections of ultrasound in the catheter body 300, improving imaging quality when using a multi-modality imaging catheter.
In some embodiments, the inner layer 330 of the catheter body 300 is selected from one of optically clear Polytetrafluoroethylene (PTFE) or Fluorinated Ethylene Propylene (FEP) with a low coefficient of friction, a thickness of 10-40 μm, an acoustic impedance of 2.5-3.2, and a light transmittance of >85%; the inner wall of the inner layer 330 of the catheter body 300 is also coated with an inert low friction material, such as a polytetrafluoroethylene molecular coating. Therefore, the inner layer 330 is made of an optically transparent material with low friction coefficient and low acoustic impedance, so that the requirements of multi-mode imaging such as optical-acoustic imaging can be met, and further, the friction between the medicine and the like in the catheter main body 300 and the inner wall of the inner layer 330 can be reduced by coating an inert low-friction material on the inner wall of the inner layer 330 of the catheter main body 300, the trafficability of the medicine is improved, and the loss of the medicine in the pushing process is reduced.
In some embodiments, as shown in fig. 3, the structural reinforcement layer 340 of the catheter body 300 is formed in a wrap spring structure along the length of the catheter body 300.
The coil spring has a pitch that increases gradually in a direction from the proximal end to the distal end and a material diameter of the coil spring decreases gradually. Specifically, the pitch of the coil spring near the atraumatic distal end 400 is 0.7-1.2mm, and the pitch of the distal end of the coil spring is 5-6 times the proximal end.
Therefore, the structure reinforcing layer 340 of the catheter main body 300 is designed into a coiled spring structure along the length direction of the catheter main body 300, on one hand, the mechanical strength of the whole catheter main body 300 can be improved, on the other hand, the screw pitch of the coiled spring is gradually increased in the direction from the proximal end to the distal end, and the material diameter of the coiled spring is gradually reduced, so that the rigidity of the coiled spring close to the proximal end part is larger, the flexibility of the distal end part is larger, the catheter main body 300 can be conveniently driven to enter the coronary artery by driving the proximal end of the catheter main body 300, and the distal end of the catheter main body 300 can flexibly extend into the coronary artery, and the damage to the inner wall of the coronary artery is reduced.
Wherein, the winding spring can be selected from one of high mechanical property, transparent polycarbonate, composite nylon or acrylic material, the acoustic impedance is 2-3, and the light transmittance is more than 85%. The multi-mode imaging requirements of optics-acoustics and the like can be met by selecting the materials with low acoustic impedance, high mechanical property and transparency.
In addition, the winding spring can be made of a hypotube, and has strong supporting capability and strong toughness.
In some embodiments, as shown in FIG. 1, the outer layer 350 of the catheter body 300 includes a proximal rigid polymeric guard 310 and a distal flexible polymeric guard 320, the rigid guard 310 having a length of 2-5cm and the flexible guard 320 having a length of 3-25cm.
Thus, it is possible to facilitate the insertion of the catheter body 300 into the coronary artery by driving the proximal end of the rigid polymer protector 310, while the distal end of the flexible polymer protector 320 flexibly extends into the coronary artery, thereby improving the trafficability of the catheter body 300 in the coronary artery while ensuring that the structure is not easily deformed.
Further, as shown in fig. 4, the guide extension catheter is used in combination with the guide catheter 700, and the guide extension catheter is driven to extend into the guide catheter 700 until the distal end of the guide catheter 700 is aligned with the distal end of the rigid polymer protecting portion 310 of the catheter body 300, which is the limit position of the guide extension catheter extending out of the guide catheter 700, and the distal end of the guide catheter 700 is sleeved on the surface of the rigid polymer protecting portion 310, so that the proximal end of the catheter body 300 can be well supported and protected, and the guide catheter body 300 can be conveniently extended into the coronary artery with directivity.
In some embodiments, the outer layer 350 of the catheter body 300 is selected from one of transparent Polyethylene (PE), polyamide (PA) or polyether block polyamide Polymer (PEBAX) having an acoustic impedance of 2-3.2 and a light transmittance of >85%, and the outer wall of the outer layer 350 of the catheter body 300 is further coated with an inert hydrophilic coating.
Thus, through the above design, acoustic impedances of the inner layer 330, the structural reinforcement layer 340 and the outer layer 350 are matched, multiple reflections of ultrasound in the extension catheter are reduced, and imaging quality is improved when the multi-modal imaging catheter is used.
In addition, the outer wall of the outer layer 350 of the catheter body 300 is coated with an inert hydrophilic coating, which reduces friction between the surface of the device and the inner wall of the coronary artery, reducing trauma to the human body.
In some embodiments, as shown in fig. 1, the push assembly 100 includes, from the proximal end to the distal end, an operating handle 110 and a push guidewire 120 coupled to the operating handle 110, wherein the push guidewire 120 passes through a structural reinforcement layer 340 coupled to the catheter body 300 by the coupling catheter 200.
That is, the push assembly 100 is provided with an operating handle 110 and a push wire 120 sequentially connected from a proximal end to a distal end, wherein the operating handle 110 may be made of a polycarbonate material and hard-coupled to one end of the push wire 120. The other end of the push wire 120 passes through the connection catheter 200 to be connected to the structural reinforcement layer 340 in the catheter body 300, for example, the other end of the push wire 120 is welded, soldered or glued to the wrap spring in the structural reinforcement layer 340, thereby ensuring the reliability of the connection of the push wire 120 to the catheter body 300.
Illustratively, as shown in fig. 5, the connecting catheter 200 is provided with a duct 230 communicating with a structural reinforcement layer 340, and the push wire 120 is inserted into the duct 230, so that the inner layer 330 and the outer layer 350 of the catheter body 300 clamp the push wire 120 together, and the push wire 120 and the catheter body 300 are tightly connected.
Preferably, the material of the pushing wire 120 includes metal, hypotube or polycarbonate, nylon, and the like.
In some embodiments, as shown in fig. 6, the push wire 120 is sequentially cylindrical, semi-cylindrical in cross-section from the proximal end to the distal end, and the diameter of the cylinder sequentially decreases.
Thereby facilitating the reliable connection of the push wire 120 through the connecting catheter 200 and the structural reinforcement layer 340 of the catheter body 300. Wherein the upper end of the pushing wire 120 is smooth, thereby ensuring that the instruments and medicines can smoothly enter the catheter body 300 through the entrance from the entrance ramp 210.
The following describes in detail the operation of the guide extension catheter according to the embodiment of the present invention.
In a first step, as shown in fig. 7, a bifurcation 820 is formed in a coronary artery 800, and the front and rear of the bifurcation 820 include a bifurcation front end 810 and a bifurcation rear end 830, respectively, and when an open lesion is optically imaged, a transparent guide extension catheter is first delivered to the position of the bifurcation front end 810 of the bifurcation 820 in the coronary artery 800 through a guide catheter 700.
Second, as shown in fig. 8, the catheter body 300 of the elongate guiding catheter is pushed by the pushing assembly 100 to the open lesion 840 position of the coronary artery 800 and is fitted to the coronary artery, and an optical or multi-modal interventional imaging catheter, such as OCT catheter 900, is provided inside the catheter body 300.
In the third step, as shown in fig. 9, in imaging, the contrast medium 1000 is injected into the branched blood vessel through the catheter main body 300 of the guide extension catheter, and blood at the bifurcation 820 and the open lesion 840 is flushed by contrast medium reflux, and simultaneously OCT pullback imaging is performed through the OCT catheter 900.
While the foregoing is directed to the preferred embodiments of the present invention, it will be appreciated by those skilled in the art that various modifications and adaptations can be made without departing from the principles of the present invention, and such modifications and adaptations are intended to be comprehended within the scope of the present invention.
Claims (10)
1. A guiding and extending catheter is characterized by comprising a pushing component, a connecting catheter, a catheter main body and a noninvasive distal end which are sequentially connected from the proximal end to the distal end,
The catheter body is provided with a first developing ring and a second developing ring, and the first developing ring is sleeved at one end of the connecting catheter, which is close to the non-invasive distal end, and the second developing ring is sleeved at one end of the connecting catheter, which is close to the catheter body.
2. The guide extension catheter of claim 1, wherein the connecting catheter comprises an entry ramp near a proximal end and a connecting tube connected to the entry ramp,
The first developing ring is sleeved on the connecting pipe body.
3. The guide extension catheter of claim 2, wherein the entrance ramp and the connecting tube wall each comprise an inner layer and an outer layer,
The inner layer is selected from one of Polytetrafluoroethylene (PTFE) or Fluorinated Ethylene Propylene (FEP),
The outer layer is selected from transparent Polytetrafluoroethylene (PTFE), polyamide (PA), polyethylene (PE) or polyether block polyamide Polymer (PEBAX).
4. The guide and extension catheter according to claim 1, wherein the wall of the catheter body is of a three-layer transparent structure, and comprises an inner layer, a structural reinforcing layer and an outer layer in sequence from inside to outside, the acoustic impedance difference between adjacent layers of the inner layer, the structural reinforcing layer and the outer layer is 0-1, and the length of the catheter body is 5-30cm.
5. The guide extension catheter of claim 4, wherein the inner layer of the catheter body is selected from one of transparent Polytetrafluoroethylene (PTFE) or Fluorinated Ethylene Propylene (FEP) having a thickness of 10-40 μm, an acoustic impedance of 2.5-3.2, and a light transmittance of >85%;
The inner wall of the inner layer of the catheter body is also coated with an inert low friction material.
6. The guide extension catheter according to claim 4, wherein the structural reinforcement layer of the catheter body is formed in a wrap spring structure along a length direction of the catheter body,
The pitch of the wrap spring increases gradually in the direction from the proximal end to the distal end and the material diameter of the wrap spring decreases gradually,
The winding spring is selected from one of polycarbonate, composite nylon, acrylic or a hypotube, wherein the polycarbonate, the composite nylon and the acrylic are made of transparent materials, the acoustic impedance is 2-3, and the light transmittance is more than 85%.
7. The guide extension catheter of claim 6, wherein the outer layer of the catheter body comprises a proximal rigid polymeric guard and a distal flexible polymeric guard, the rigid guard having a length of 2-5cm and the flexible guard having a length of 3-25cm.
8. The guide extension catheter of claim 7, wherein the outer layer of the catheter body is selected from one of transparent Polyethylene (PE), polyamide (PA), polyether block polyamide Polymer (PEBAX) or Polytetrafluoroethylene (PTFE) having an acoustic impedance of 2-3.2 and a light transmittance of >85%, and an inert hydrophilic coating is further coated on the outer wall of the outer layer of the catheter body.
9. The guide extension catheter of claim 4, wherein the push assembly comprises, from proximal end to distal end, an operating handle and a push wire coupled to the operating handle, wherein the push wire passes through the connecting catheter to connect the structural reinforcement layer of the catheter body, the push wire having a cross-section that is sequentially cylindrical, semi-cylindrical, and sequentially decreasing in diameter from proximal end to distal end.
10. The guide extension catheter of claim 1, wherein the atraumatic distal tip is selected from one of flexible transparent Polyethylene (PE), polyamide (PA) or polyether block polyamide Polymer (PEBAX), the atraumatic distal tip having a length of 2-11mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410156986.5A CN118045273A (en) | 2024-02-04 | 2024-02-04 | Guiding and extending catheter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410156986.5A CN118045273A (en) | 2024-02-04 | 2024-02-04 | Guiding and extending catheter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN118045273A true CN118045273A (en) | 2024-05-17 |
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ID=91049525
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410156986.5A Pending CN118045273A (en) | 2024-02-04 | 2024-02-04 | Guiding and extending catheter |
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| Country | Link |
|---|---|
| CN (1) | CN118045273A (en) |
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2024
- 2024-02-04 CN CN202410156986.5A patent/CN118045273A/en active Pending
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