CN116807515A - Medical catheter and system - Google Patents
Medical catheter and system Download PDFInfo
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- CN116807515A CN116807515A CN202210280988.6A CN202210280988A CN116807515A CN 116807515 A CN116807515 A CN 116807515A CN 202210280988 A CN202210280988 A CN 202210280988A CN 116807515 A CN116807515 A CN 116807515A
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- Prior art keywords
- tube
- medical catheter
- tube body
- distal end
- drive shaft
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Links
- 238000003384 imaging method Methods 0.000 claims abstract description 60
- 239000000523 sample Substances 0.000 claims abstract description 37
- 238000000034 method Methods 0.000 claims description 8
- 239000011248 coating agent Substances 0.000 claims description 7
- 238000000576 coating method Methods 0.000 claims description 7
- 229920002614 Polyether block amide Polymers 0.000 claims description 4
- 238000004891 communication Methods 0.000 claims description 4
- 238000007789 sealing Methods 0.000 claims description 4
- 239000004698 Polyethylene Substances 0.000 claims description 3
- 229920001971 elastomer Polymers 0.000 claims description 3
- 239000000806 elastomer Substances 0.000 claims description 3
- 230000005284 excitation Effects 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- -1 polyethylene Polymers 0.000 claims description 3
- 229920000573 polyethylene Polymers 0.000 claims description 3
- 229920002635 polyurethane Polymers 0.000 claims description 3
- 239000004814 polyurethane Substances 0.000 claims description 3
- 229920001296 polysiloxane Polymers 0.000 claims 1
- 210000004204 blood vessel Anatomy 0.000 description 14
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 9
- 239000002504 physiological saline solution Substances 0.000 description 9
- 238000002608 intravascular ultrasound Methods 0.000 description 8
- 238000002604 ultrasonography Methods 0.000 description 8
- 230000008569 process Effects 0.000 description 6
- 239000008280 blood Substances 0.000 description 5
- 210000004369 blood Anatomy 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 230000004075 alteration Effects 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 238000011010 flushing procedure Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229920000036 polyvinylpyrrolidone Polymers 0.000 description 2
- 235000013855 polyvinylpyrrolidone Nutrition 0.000 description 2
- 239000001267 polyvinylpyrrolidone Substances 0.000 description 2
- 238000005381 potential energy Methods 0.000 description 2
- 239000000741 silica gel Substances 0.000 description 2
- 229910002027 silica gel Inorganic materials 0.000 description 2
- 239000011780 sodium chloride Substances 0.000 description 2
- 208000037260 Atherosclerotic Plaque Diseases 0.000 description 1
- 208000031481 Pathologic Constriction Diseases 0.000 description 1
- 208000007536 Thrombosis Diseases 0.000 description 1
- 210000003484 anatomy Anatomy 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000002405 diagnostic procedure Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 206010020718 hyperplasia Diseases 0.000 description 1
- 238000002513 implantation Methods 0.000 description 1
- 238000000338 in vitro Methods 0.000 description 1
- 238000001802 infusion Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000002262 irrigation Effects 0.000 description 1
- 238000003973 irrigation Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000010412 perfusion Effects 0.000 description 1
- 208000037803 restenosis Diseases 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 208000037804 stenosis Diseases 0.000 description 1
- 230000036262 stenosis Effects 0.000 description 1
- 238000003325 tomography Methods 0.000 description 1
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B8/00—Diagnosis using ultrasonic, sonic or infrasonic waves
- A61B8/08—Detecting organic movements or changes, e.g. tumours, cysts, swellings
- A61B8/0891—Detecting organic movements or changes, e.g. tumours, cysts, swellings for diagnosis of blood vessels
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B8/00—Diagnosis using ultrasonic, sonic or infrasonic waves
- A61B8/08—Detecting organic movements or changes, e.g. tumours, cysts, swellings
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B8/00—Diagnosis using ultrasonic, sonic or infrasonic waves
- A61B8/12—Diagnosis using ultrasonic, sonic or infrasonic waves in body cavities or body tracts, e.g. by using catheters
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B8/00—Diagnosis using ultrasonic, sonic or infrasonic waves
- A61B8/44—Constructional features of the ultrasonic, sonic or infrasonic diagnostic device
- A61B8/4483—Constructional features of the ultrasonic, sonic or infrasonic diagnostic device characterised by features of the ultrasound transducer
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M25/00—Catheters; Hollow probes
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M25/00—Catheters; Hollow probes
- A61M25/0043—Catheters; Hollow probes characterised by structural features
- A61M25/0045—Catheters; Hollow probes characterised by structural features multi-layered, e.g. coated
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M25/00—Catheters; Hollow probes
- A61M25/0067—Catheters; Hollow probes characterised by the distal end, e.g. tips
- A61M25/0068—Static characteristics of the catheter tip, e.g. shape, atraumatic tip, curved tip or tip structure
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M25/00—Catheters; Hollow probes
- A61M25/01—Introducing, guiding, advancing, emplacing or holding catheters
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M25/00—Catheters; Hollow probes
- A61M25/01—Introducing, guiding, advancing, emplacing or holding catheters
- A61M25/0105—Steering means as part of the catheter or advancing means; Markers for positioning
Abstract
The invention provides a medical catheter and a system, the medical catheter comprises: a sheath assembly comprising a tube body having a distal end closed and a distal sidewall formed with a one-way passage, the tube body being configured to open when a pressure in an interior cavity of the tube body is greater than or equal to a predetermined value and to close when the pressure in the interior cavity of the tube body is less than the predetermined value; and a core assembly comprising a flexible drive shaft and an imaging probe, a distal end of the flexible drive shaft disposed in the lumen of the tube, the flexible drive shaft configured to be movable in an axial direction of the tube and to be autorotative about an axis thereof; the imaging probe is disposed at a distal end of the flexible drive shaft. The medical catheter can be used for intravascular imaging, and can simplify imaging operation, shorten operation time and improve safety.
Description
Technical Field
The invention relates to the technical field of medical instruments, in particular to a medical catheter and a system.
Background
Intravascular ultrasound imaging (Intravascular ultrasound tomography, IVUS) is a novel diagnostic method that combines non-invasive ultrasound examination with minimally invasive catheter intervention techniques. The IVUS images a miniaturized ultrasound probe placed in a vessel lumen by catheter technology, can accurately describe a complex three-dimensional anatomical structure of the vessel wall in real time, evaluate the stenosis degree of the vessel lumen, and can further check the vulnerability and plaque load of an atherosclerotic plaque, and is considered as a new "gold standard" for blood vessel examination. In addition, IVUS can also be used for guiding stent implantation, evaluating intimal hyperplasia of a stent, discussing the cause of restenosis in the stent, detecting poor adhesion of the late stage of the stent, detecting thrombus in the stent and the like.
The intravascular ultrasound catheter in the prior art mainly comprises a sheath tube assembly and an inner core assembly, wherein the sheath tube assembly comprises a tube body, a through hole is formed in the distal end of the tube body, the inner core assembly comprises a flexible driving shaft and an ultrasound probe, the flexible driving shaft is partially arranged in the tube body in a penetrating mode so that the distal end of the flexible driving shaft is located in the tube body, the ultrasound probe is arranged at the distal end of the flexible driving shaft, the flexible driving shaft can move along the axial direction of the tube body and can rotate automatically, and the ultrasound probe is driven to move along the axial direction of the tube body and rotate automatically. The use process of the intravascular ultrasound catheter is as follows: firstly, normal saline is poured into the tube body from the proximal end, the normal saline carries air in the tube body and is discharged from the through hole at the distal end of the tube body together, then the distal end of the intravascular ultrasound catheter enters a preset position in a blood vessel, and then the flexible driving shaft is driven to move (namely retract) along the distal end to the proximal end direction and is driven to rotate, and meanwhile, the ultrasound probe emits ultrasound signals and acquires image information of the blood vessel passing through the position. Because the through hole on the body distal end is in open state all the time, in the use, especially when flexible drive shaft is withdrawing, blood very easily gets into the sheath from the through hole, influences imaging effect and the continuity of use, consequently the person of performing the art often still need pour normal saline many times in order to discharge blood, leads to complex operation, extension operation time, increases the operation risk.
Disclosure of Invention
The invention aims to provide a medical catheter and a system, which can be used for intravascular imaging, can simplify operation, shorten operation time and reduce operation risk.
To achieve the above object, the present invention provides a medical catheter comprising:
a sheath tube assembly comprising a tube body, a distal end of the tube body being closed, and a one-way passage being formed on a distal side wall of the tube body and communicating with an inner cavity of the tube body, the tube body being configured to open when a pressure in the inner cavity of the tube body is greater than or equal to a predetermined value, the one-way passage being closed when the pressure in the inner cavity of the tube body is less than the predetermined value; and
a core assembly comprising a flexible drive shaft and an imaging probe, a distal end of the flexible drive shaft disposed in an inner lumen of the tube, the flexible drive shaft configured to be movable in an axial direction of the tube and to be rotatable about an axis thereof; the imaging probe is disposed at a distal end of the flexible drive shaft.
Optionally, a predetermined area is provided on the distal sidewall of the tube body, the predetermined area is configured to have elasticity, and a slit is formed on the predetermined area, and the slit forms the unidirectional channel.
Optionally, the sheath assembly further comprises a guide head, wherein the guide head is arranged at the distal end of the tube body, and a guide wire channel is arranged on the guide head, and the axis of the guide wire channel is inclined relative to the axis of the tube body.
Optionally, the distance from the distal end of the slit to the distal end of the introducer is 15mm to 25mm; and/or the length of the kerf is 1 mm-3 mm.
Optionally, the material of the predetermined region is selected from any one of polyurethane, polyethylene, silica gel, and block polyether amide elastomer.
Optionally, the flexible drive shaft includes a shaft body and a hydrophilic coating disposed on an outer surface of the shaft body.
Optionally, the sheath tube assembly further comprises a first proximal connection portion, an adapter and a flushing connector, the adapter is arranged at the proximal end of the tube body, the first proximal connection portion is connected with the proximal end of the adapter, the inner cavity of the first proximal connection portion, the inner cavity of the adapter and the inner cavity of the tube body are sequentially communicated, and the flushing connector is arranged on the first proximal connection portion and is communicated with the inner cavity of the first proximal connection portion.
Optionally, the core assembly further comprises a second proximal connection portion at least partially disposed in the lumen of the first proximal connection portion, a distal end of the second proximal connection portion being connected to the flexible drive shaft, a proximal end of the second proximal connection portion being adapted to be connected to an external drive device for transmitting a driving force provided by the drive device to the flexible drive shaft.
Optionally, a sealing structure is provided between the first proximal connection and the second proximal connection.
To achieve the above object, the present invention also provides a medical system comprising:
the medical catheter of any one of the preceding claims;
the driving device is connected with the flexible driving shaft and is used for driving the flexible driving shaft to move along the axial direction of the pipe body and driving the flexible driving shaft to rotate;
the imaging host is in communication connection with the imaging probe, and is used for sending an excitation signal to the imaging probe so as to drive the imaging probe to emit an image acquisition signal, and the imaging host is also used for receiving the imaging signal obtained by the imaging probe.
Compared with the prior art, the medical catheter and the system have the following advantages:
the medical catheter comprises a sheath tube assembly and an inner core assembly; wherein the sheath tube assembly comprises a tube body, a distal end of the tube body is closed, a one-way channel is formed on a distal side wall of the tube body, the tube body is configured to be opened when the pressure in the inner cavity of the tube body is greater than or equal to a predetermined value, and closed when the pressure in the inner cavity of the tube body is less than the predetermined value; the inner core assembly includes a flexible drive shaft having a distal end disposed in the lumen of the tube, the flexible drive shaft configured to be movable in an axial direction of the tube and to be rotatable about an axis thereof, and an imaging probe disposed at the distal end of the flexible drive shaft. When the medical catheter is used, firstly, normal saline is poured into the inner cavity of the catheter body from the proximal end of the catheter body, and the pressure of the normal saline applied to the catheter body is larger than the preset value, so that a one-way channel is opened, the normal saline carries air in the catheter body to be discharged out of the catheter body together with the one-way channel, the catheter body is not stressed any more, and the one-way channel is closed; and then conveying the distal end of the medical catheter to a preset position in a blood vessel according to a conventional method, controlling the flexible driving shaft to move along the direction from the distal end to the proximal end, and controlling the flexible driving shaft to rotate around the axis of the flexible driving shaft so as to drive the imaging probe to rotate, and simultaneously, the imaging probe transmits an image acquisition signal and receives an imaging signal of the blood vessel wall. In the use of medical catheter, when the distal end of medical catheter gets into in the blood vessel, the unidirectional channel is closed, can prevent blood from follow unidirectional channel department gets into the inner chamber of body, and then need not many times to pour normal saline in order to discharge the blood vessel that gets into the body, also can avoid the blood vessel to cause the interference to imaging for imaging can go on in succession, has still simplified the imaging operation, shortens operation time, reduces the operation risk.
Drawings
The drawings are included to provide a better understanding of the invention and are not to be construed as unduly limiting the invention. Wherein:
FIG. 1 is a schematic view of a medical catheter according to an embodiment of the present invention;
FIG. 2 is a schematic view of a part of a medical catheter according to an embodiment of the present invention, in which a unidirectional passage is shown and the unidirectional passage is closed;
FIG. 3 is a schematic view of a part of a medical catheter according to an embodiment of the present invention, showing a unidirectional passage, and the unidirectional passage being open;
FIG. 4 is a schematic view of a portion of a medical catheter according to an embodiment of the present invention, showing a guide tip and a guide wire channel;
fig. 5 is a schematic structural view of a medical system according to an embodiment of the present invention.
Reference numerals are described as follows:
1-a medical system;
10-medical catheter, 100-sheath tubing assembly, 110-tube, 111-unidirectional channel, 112-proximal tubing segment, 113-distal tubing segment, 120-introducer, 121-guidewire channel, 130-first proximal connector, 131-head, 132-junction tube, 140-adapter, 150-flush joint, 200-core assembly, 210-flexible drive shaft, 211-shaft, 212-hydrophilic coating, 220-imaging probe, 230-second proximal connector, 300-sealing structure;
20-driving means;
30-imaging host.
Detailed Description
Other advantages and effects of the present invention will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present invention with reference to specific examples. The invention may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present invention. It should be noted that, the illustrations provided in the present embodiment merely illustrate the basic concept of the present invention by way of illustration, and only the components related to the present invention are shown in the drawings and are not drawn according to the number, shape and size of the components in actual implementation, and the form, number and proportion of the components in actual implementation may be arbitrarily changed, and the layout of the components may be more complex.
In addition, each embodiment of the following description has one or more features, respectively, which does not mean that the inventor must implement all features of any embodiment at the same time, or that only some or all of the features of different embodiments can be implemented separately. In other words, those skilled in the art can implement some or all of the features of any one embodiment or a combination of some or all of the features of multiple embodiments selectively, depending on the design specifications or implementation requirements, thereby increasing the flexibility of the implementation of the invention where implemented as possible.
As used in this specification, the singular forms "a", "an" and "the" include plural referents, unless the content clearly dictates otherwise. As used in this specification, the term "or" is generally employed in its sense including "and/or" unless the content clearly dictates otherwise, and the terms "mounted," "connected," and "connected" are to be construed broadly, as for example, they may be fixed, they may be removable, or they may be integrally connected. Either mechanically or electrically. Can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
As used herein, the terms "proximal" and "distal" refer to the relative orientation, relative position, orientation of elements or actions relative to one another from the perspective of the physician using the medical device, although "proximal" and "distal" are not intended to be limiting, and "proximal" generally refers to the end of the medical device that is adjacent to the physician during normal operation, and "distal" generally refers to the end that first enters the patient.
The invention will be further described in detail with reference to the accompanying drawings, in order to make the objects, advantages and features of the invention more apparent. It should be noted that the drawings are in a very simplified form and are all to a non-precise scale, merely for convenience and clarity in aiding in the description of embodiments of the invention. The same or similar reference numbers in the drawings refer to the same or similar parts.
Fig. 1 shows a schematic structural view of a medical catheter 10 according to an embodiment of the present invention, and fig. 2 and 3 show schematic partial structural views of the medical catheter 10. As shown in fig. 1-3, the medical catheter 10 includes a sheath assembly 100 and a core assembly 200. Wherein, the sheath assembly 100 comprises a tube body 110, the distal end of the tube body 110 is closed, and a unidirectional channel 111 is formed on the distal sidewall of the tube body 110. The tube body 110 is configured such that the one-way passage 111 is opened to communicate the inner cavity with the outside when the pressure in the inner cavity of the tube body 110 is greater than or equal to a predetermined value (as shown in fig. 3), and the one-way passage 111 is closed when the pressure in the inner cavity of the tube body 110 is less than the predetermined value (as shown in fig. 2). The core assembly 200 includes a flexible drive shaft 210 and an imaging probe 220. The distal end of the flexible drive shaft 210 is disposed within the lumen of the tube 110, and the flexible drive shaft 210 is configured to be movable in the axial direction of the tube 110 and to be rotatable about its axis. The imaging probe 220 is disposed at the distal end of the flexible drive shaft 210.
The medical catheter 10 may be used for intravascular imaging, and as such, the imaging probe 220 may be an ultrasound transducer. The use process of the medical catheter 10 comprises the following steps:
step S1: the physiological saline is filled into the inner cavity of the tube 110 from the proximal end of the tube 110, the physiological saline generates fluid pressure in the inner cavity of the tube 110, when the fluid pressure is greater than the predetermined value, the one-way channel 111 is opened, the physiological saline is discharged from the one-way channel 111 to the tube 110, and during the discharging process, the physiological saline also carries air in the tube 110 to be separated from the tube 110 together. It will be appreciated that this step is performed in vitro in the patient.
Step S2: the distal end of the medical catheter 10 is delivered to a predetermined location within the vessel along a guidewire that is pre-introduced into the vessel.
Step S3: the flexible drive shaft 210 is controlled to move in a distal-to-proximal direction and the flexible drive shaft 210 is controlled to spin about its own axis such that the imaging probe 220 moves in a distal-to-proximal direction with the flexible drive shaft 210 and rotates about the axis of the flexible drive shaft 210. At the same time, the imaging probe 220 also transmits image acquisition signals and receives image signals for acquiring intravascular image information.
Here, when the distal end of the medical catheter 10 enters the blood vessel, the perfusion of the physiological saline into the tube 110 is stopped, so that the pressure in the tube 110 disappears, the unidirectional channel 111 is closed, so that the blood can be prevented from entering the inner cavity of the tube 110 from the unidirectional channel 111, the interference of the blood to the imaging process is avoided, and the physiological saline does not need to be repeatedly perfused to flush the tube, thereby simplifying the operation steps of the imaging process, improving the continuity of the imaging process, shortening the operation time and improving the operation safety.
Optionally, a predetermined area is provided on the distal sidewall of the tube 110, the predetermined area is configured to have elasticity, and a slit is formed on the predetermined area. When the pressure in the inner cavity of the tube body 110 is greater than or equal to the predetermined value, the predetermined region is deformed and stores elastic potential energy so that the slit is opened, and when the pressure in the tube body 110 is less than the predetermined value, the predetermined region releases the elastic potential energy and resumes the deformation so that the slit is closed. In other words, in this embodiment, the slit constitutes the unidirectional passage 111. The material of the predetermined region is selected from any one of polyurethane, polyethylene, silica gel and block polyether amide elastomer (Pebax).
The slits extend in the axial direction of the tube body 110 such that the slits have opposite proximal and distal ends in the axial direction of the tube body 110. It will be appreciated that the slit may be parallel to the axis of the tube 110 or may be inclined with respect to the axis of the tube 110, which is not limited in this embodiment. The predetermined value is related to the size of the slit, and the length of the slit cannot be too large or too small, if the length of the slit is too large, the closing of the slit is not facilitated, and if the length of the slit is too small, the predetermined value is too large. Alternatively, the length of the slit is 1mm to 3mm, and accordingly, the predetermined value is 20Kpa to 35Kpa. In addition, the slits should be as close to the distal end of the tube body 110 as possible, and in doing so, the gas located in the entire length range in the axial direction of the tube body 110 can be entirely discharged as much as possible using physiological saline.
In addition, the body 110 may include a proximal tube segment 112 and a distal tube segment 113 that are axially connected, the proximal tube segment 112 having a hardness that is greater than the hardness of the distal tube segment 113, such that the medical catheter 10 has a better pushability. The slits are provided on the distal tube segment 113.
And, as shown in fig. 1 and 4, the sheath tube assembly 100 further includes a guide head 120, the guide head 120 is disposed at a distal end of the tube body 110, and a guide wire channel 121 is disposed on the guide head 120, and an axis of the guide wire channel 121 is inclined with respect to an axis of the tube body 110. Thus, in the aforementioned step S2, the sheath assembly 100 is sleeved on the guide wire through the guide wire channel 121, and the distal end of the tube 110 can reach the predetermined position in the blood vessel under the guidance of the guide wire. The distance from the distal end of the introducer 120 to the distal end of the slit is preferably 15mm to 25mm.
Optionally, a developing element (not shown) is further disposed on the seeker 120, and the developing element is used to display the position of the seeker 120 in the blood vessel, so as to facilitate the operator to determine the position of the distal end of the tube 110 in the blood vessel.
Further, the sheath assembly 100 also includes a first proximal connection 130, an adapter 140, and an irrigation adapter 150. The adapter 140 connects the tube 110 and the first proximal connection 130. The first proximal end connection 130 includes a head 131 and a joint tube 132, the head 131 is disposed at the proximal end of the joint tube 132, the adapter 140 specifically connects the distal end of the joint tube 132 and the proximal end of the tube body 110, and two different lengths of tubing can be firmly joined together by disposing the adapter 140. And, the inner cavity of the first proximal end connection portion 130, the inner cavity of the adapter 140, and the inner cavity of the tube 110 are sequentially communicated. The flush fitting 150 is disposed on the first proximal connection 130, specifically on the head 131, and communicates with the lumen of the tube 110. The flush fitting 150 is, for example, a luer fitting for connection to an external infusion mechanism for infusing saline into the tube 110. Optionally, a one-way valve is further provided on the flush joint 150 to prevent reverse flow of saline.
Further, the flexible driving shaft 210 includes a shaft body 211 and a hydrophilic coating 212 provided on an outer surface of the shaft body 211. By providing the hydrophilic coating 212 on the outer surface of the shaft body 211, the physiological saline can be quickly infiltrated into the outer surface of the flexible driving shaft 210 when the physiological saline is infused, so that bubbles attached to the flexible driving shaft 210 are reduced, and the air in the body 110 is discharged as much as possible. The hydrophilic coating 212 may be polyvinylpyrrolidone (PVP) or any other suitable hydrophilic coating. The shaft body 211 is preferably a three-dimensional helical spring structure, which has sufficient flexibility and maintains rigidity required for rotation.
Further, referring back to fig. 1, the core assembly 200 further includes a second proximal connection portion 230, where the second proximal connection portion 230 is disposed at a proximal end of the flexible driving shaft 210, and a proximal end of the second proximal connection portion 230 is configured to be connected to an external driving device 20 (as shown in fig. 5) so as to transmit a driving force provided by the driving device 20 to the flexible driving shaft 210, thereby driving the flexible driving shaft 210 to move along an axial direction of the tube body 110, and simultaneously driving the flexible driving shaft 210 to rotate.
When assembling the medical catheter 10, the sheath assembly 100 may be assembled first, then the core assembly 200 may be assembled, then the distal end of the flexible drive shaft 210 may be inserted into the tube 110, and the second proximal connection portion 230 may be at least partially disposed in the first proximal connection portion 130, particularly the inner cavity of the head 131, and a sealing structure 300 may be disposed between the first proximal connection portion 130 and the second proximal connection portion 230 to prevent air from entering the tube 110 from the first proximal connection portion 130. In addition, when the medical catheter 10 is assembled, the imaging probe 220 should be as close to the distal end of the tube body 110 as possible, so that when the flexible driving shaft 210 drives the imaging probe 220 to move in the tube body 110 along the distal-to-proximal direction, the moving distance of the imaging probe 220 in the axial direction of the tube body 110 is as large as possible, and further, the moving distance of the imaging probe 220 in the axial direction of the blood vessel is as large as possible, thereby achieving the effect of increasing the imaging range of the blood vessel.
Further, as shown in fig. 5, the embodiment of the present invention further provides a medical system 1, wherein the medical system 1 comprises the medical catheter 10, the driving device 20 and the imaging host 30 as described above. The driving device 20 is connected to the proximal end of the flexible driving shaft 210, and is used for driving the flexible driving shaft 210 to move along the axial direction of the tube body 110 and driving the flexible driving shaft 210 to rotate around the axis thereof. The imaging host 30 is communicatively connected to the imaging probe 220, the imaging host 30 is configured to send an excitation signal to the imaging probe 220 to drive the imaging probe 220 to emit an image acquisition signal, and the imaging host 30 is further configured to receive an imaging signal obtained by the imaging probe 220. It will be appreciated that when the imaging probe 220 is an ultrasonic transducer, the image acquisition signal is ultrasonic, and the imaging signal is an electrical signal obtained by the imaging host 30 from the wave signal returned by the vessel wall.
Although the present invention is disclosed above, it is not limited thereto. Various modifications and alterations of this invention may be made by those skilled in the art without departing from the spirit and scope of this invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (10)
1. A medical catheter, comprising:
a sheath tube assembly comprising a tube body, a distal end of the tube body being closed, and a one-way passage being formed on a distal side wall of the tube body and communicating with an inner cavity of the tube body, the tube body being configured to open when a pressure in the inner cavity of the tube body is greater than or equal to a predetermined value, the one-way passage being closed when the pressure in the inner cavity of the tube body is less than the predetermined value; the method comprises the steps of,
a core assembly comprising a flexible drive shaft and an imaging probe, a distal end of the flexible drive shaft disposed in an inner lumen of the tube, the flexible drive shaft configured to be movable in an axial direction of the tube and to be rotatable about an axis thereof; the imaging probe is disposed at a distal end of the flexible drive shaft.
2. The medical catheter of claim 1, wherein a predetermined area is provided on a distal sidewall of the tube body, the predetermined area being configured to be resilient, the predetermined area having a slit formed therein, the slit constituting the unidirectional passage.
3. The medical catheter of claim 2, wherein the sheath assembly further comprises a guide head disposed at a distal end of the tube, and wherein a guidewire channel is disposed on the guide head, the axis of the guidewire channel being inclined relative to the axis of the tube.
4. A medical catheter according to claim 3, wherein the distance from the distal end of the slit to the distal end of the introducer is 15mm to 25mm; and/or the length of the kerf is 1 mm-3 mm.
5. The medical catheter of claim 2, wherein the predetermined region of material is selected from any one of polyurethane, polyethylene, silicone, and block polyether amide elastomer.
6. The medical catheter of claim 1, wherein the flexible drive shaft comprises a shaft body and a hydrophilic coating disposed on an outer surface of the shaft body.
7. The medical catheter of claim 1, wherein the sheath assembly further comprises a first proximal connection, an adapter, and a flush connector, the adapter is disposed at the proximal end of the tube, the first proximal connection is connected to the proximal end of the adapter, and the lumen of the first proximal connection, the lumen of the adapter, and the lumen of the tube are in communication, and the flush connector is disposed on the first proximal connection and in communication with the lumen of the first proximal connection.
8. The medical catheter of claim 7, wherein the core assembly further comprises a second proximal connection disposed at least partially within the lumen of the first proximal connection, a distal end of the second proximal connection being coupled to the flexible drive shaft, a proximal end of the second proximal connection being configured to couple to an external drive device to transfer a driving force provided by the drive device to the flexible drive shaft.
9. The medical catheter of claim 8, wherein a sealing structure is disposed between the first proximal connection and the second proximal connection.
10. A medical system, comprising:
the medical catheter of any one of claims 1-9;
the driving device is connected with the flexible driving shaft and is used for driving the flexible driving shaft to move along the axial direction of the pipe body and driving the flexible driving shaft to rotate;
the imaging host is in communication connection with the imaging probe, and is used for sending an excitation signal to the imaging probe so as to drive the imaging probe to emit an image acquisition signal, and the imaging host is also used for receiving the imaging signal obtained by the imaging probe.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210280988.6A CN116807515A (en) | 2022-03-21 | 2022-03-21 | Medical catheter and system |
| PCT/CN2023/078480 WO2023179316A1 (en) | 2022-03-21 | 2023-02-27 | Medical catheter and system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210280988.6A CN116807515A (en) | 2022-03-21 | 2022-03-21 | Medical catheter and system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116807515A true CN116807515A (en) | 2023-09-29 |
Family
ID=88099880
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210280988.6A Pending CN116807515A (en) | 2022-03-21 | 2022-03-21 | Medical catheter and system |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN116807515A (en) |
| WO (1) | WO2023179316A1 (en) |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5250034A (en) * | 1990-09-17 | 1993-10-05 | E-Z-Em, Inc. | Pressure responsive valve catheter |
| US6569145B1 (en) * | 1999-03-25 | 2003-05-27 | Transvascular, Inc. | Pressure-controlled continuous coronary sinus occlusion device and methods of use |
| US6432091B1 (en) * | 1999-12-16 | 2002-08-13 | Sci Med Life Systems, Inc. | Valved over-the-wire catheter |
| CN105879202A (en) * | 2016-04-01 | 2016-08-24 | 马燕兰 | PICC (Peripherally Inserted Central Catheter) |
| CN109172042B (en) * | 2018-09-07 | 2024-03-12 | 郑州大学第一附属医院 | Laser in-situ windowing system under ultrasonic guidance and application method thereof |
| CN113143315A (en) * | 2021-02-09 | 2021-07-23 | 深圳市赛禾医疗技术有限公司 | Intravascular ultrasonic imaging catheter and system with forward-looking capability |
| CN112826536A (en) * | 2021-02-09 | 2021-05-25 | 深圳市赛禾医疗技术有限公司 | Intravascular ultrasonic imaging catheter and system |
| CN217827913U (en) * | 2022-03-21 | 2022-11-18 | 深圳微创踪影医疗装备有限公司 | Medical catheter and system |
-
2022
- 2022-03-21 CN CN202210280988.6A patent/CN116807515A/en active Pending
-
2023
- 2023-02-27 WO PCT/CN2023/078480 patent/WO2023179316A1/en unknown
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| Publication number | Publication date |
|---|---|
| WO2023179316A1 (en) | 2023-09-28 |
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