CN113893444A - a medical device - Google Patents

Abstract

The present invention relates to a medical device comprising: a perfusion catheter; the blocking mechanism comprises a balloon and a catheter body; the balloon is disposed on an outer surface of the perfusion catheter; the catheter body is communicated with the balloon and is used for infusing an inflating agent to the balloon; the supporting mechanism comprises a supporting body and a driving body, the supporting body is arranged on the outer surface of the perfusion catheter and is positioned at the proximal end of the balloon; the driving body is connected with the supporting body and used for driving the supporting body to expand outwards or contract inwards along the radial direction of the supporting body. When the medical device is used for the operation treatment of the aortic dissection, a clean operation visual field can be provided, the operation of a doctor is convenient, the circulation stopping time is obviously shortened, and the damage to important organs of the lower half of a patient is reduced.

Description

Medical device

Technical Field

The invention relates to the technical field of medical instruments, in particular to a medical device applied to aortic total arch replacement and stent trunk operation.

Background

The aortic dissection refers to a state that blood in an aortic lumen enters an aortic media from a torn part of the aortic intima to separate the media, and expands along the major axis direction of the aorta to form a true-false separation state of two lumens of the aortic wall, and is an aortic disease with critical illness state, rapid progress and high death rate. Dissection hematoma in the middle aorta can cause serious cardiovascular emergencies, and 65% -70% of patients die in the acute stage due to cardiac tamponade, arrhythmia and the like, so that early treatment of aortic dissection is very necessary. At present, the aortic dissection is mainly treated by an operation, wherein a Stanford B-type dissection with a break at a descending aorta is generally treated by an intervention, and a Stanford A-type dissection with a break involving an ascending aorta and an aortic arch is generally treated by a mode of combining an aortic total arch replacement operation and a stent trunk surgery.

The trunk operation is to implant one section of free artificial blood vessel in descending aorta during ascending aorta and aortic arch replacement, so that deep low temperature circulation stopping is not needed during second-stage descending aorta operation. The trunk operation shortens the aorta blocking time and reduces the risk of ischemic complications, but the traditional trunk operation is easy to cause the aorta wall to be torn due to limited visual field and difficult needle insertion and extraction, and meanwhile, the postoperative cerebral complications are easy to occur due to long in-operation stopping circulation time. The state-of-the-art Sunshire surgery, which is the classic procedure for the treatment of Stanford type A dissections (i.e. total aortic arch replacement surgery + stenting rhinoplasty), further simplifies the procedure, but it also requires a deep hypothermic rest cycle.

In summary, the following problems exist in the prior art: the operation field of vision shows the difficulty, descending aorta returns blood and further influences the field of vision definition, the operation needs to be carried out under the extracorporeal circulation state, when descending aorta anastomosis is carried out, often because various reasons lead to trunk support near-end and patient's autologous blood vessel laminating badly, be unfavorable for the anastomosis, cause the anastomosis time overlength, this extension that just leads to dark low temperature to stop the circulation time, and then make organs such as spinal cord, liver, intestines and stomach receive the possibility increase of the damage of ischemia oxygen deficiency, be unfavorable for patient's postoperative to resume.

Disclosure of Invention

The invention aims to provide a medical device, which is used for providing a clear operation visual field, can perform descending aorta anastomosis operation under the extracorporeal circulation condition, greatly shortens the time of deep low temperature circulation stopping, reduces ischemia and low temperature injury to important organs of the lower half of a patient, is beneficial to postoperative recovery of the patient, and particularly improves the adhesion of an elephant nose bracket and a patient self blood vessel, facilitates anastomosis operation and shortens anastomosis time.

To achieve the above object, the present invention provides a medical device comprising:

a perfusion catheter;

the blocking mechanism comprises a balloon and a catheter body; the balloon is disposed on an outer surface of the perfusion catheter; the catheter body is communicated with the balloon and is used for infusing an inflating agent to the balloon; and the number of the first and second groups,

a support mechanism comprising a support body and a drive body, the support body being disposed on an outer surface of the perfusion catheter and on a proximal side of the balloon; the driving body is connected with the supporting body and used for driving the supporting body to expand outwards or contract inwards along the radial direction of the supporting body.

Optionally, the driving body is sleeved on the outer surface of the perfusion catheter and can move along the axial direction of the perfusion catheter; the far end of the supporting body is fixedly connected with the perfusion catheter, and the near end of the supporting body is fixedly connected with the far end of the driving body;

the support mechanism is configured to: when the driving body moves towards the distal end of the perfusion catheter, the driving body drives the proximal end of the supporting body to move towards the distal end of the perfusion catheter, so that the supporting body is deformed and expanded; when the driving body moves towards the proximal end of the perfusion catheter, the driving body drives the proximal end of the supporting body to move towards the proximal end of the perfusion catheter, so that the supporting body is contracted.

Optionally, the support body is formed by weaving a plurality of weaving wires, and at least part of the weaving wires are metal wires.

Optionally, the maximum diameter of the support body when expanded is between 35mm and 40 mm.

Optionally, the supporting mechanism further includes a first handle, the first handle is disposed on an outer surface of the perfusion catheter and is capable of moving along an axial direction of the perfusion catheter, and the first handle is fixedly connected to the proximal end of the driving body.

Optionally, the support mechanism further comprises a locking assembly disposed on the first handle for selectively connecting and disconnecting with the irrigation conduit;

the support mechanism is configured to: when the locking assembly is connected with the perfusion catheter, the first handle, the driving body and the proximal end of the supporting body are prevented from moving along the axial direction of the perfusion catheter; when the locking assembly is disconnected with the perfusion catheter, the first handle, the driving body and the proximal end of the supporting body are allowed to move along the axial direction of the perfusion catheter.

Optionally, the locking assembly comprises a locking portion and a nut; the locking part is arranged at the near end of the first handle and is of a hollow tubular structure, external threads are arranged on the locking part, and a plurality of open grooves are formed in the near end of the locking part; the nut is used for being sleeved on the outer surface of the locking portion and is in threaded connection with the locking portion.

Optionally, the catheter body is threaded inside the perfusion catheter, and the distal end of the catheter body extends through the distal tube wall of the perfusion catheter to communicate with the balloon.

Optionally, the blocking mechanism further comprises a syringe spirally wound inside the first handle, and a distal end of the syringe extends into the perfusion catheter and is connected with the proximal end of the catheter body, and a proximal end of the syringe extends through the first handle to the outside of the first handle;

the proximal end of the syringe moves synchronously with the first handle as the first handle moves toward the distal end of the infusion catheter to stretch deform the syringe.

Optionally, a second handle is included, the second handle being disposed on the outer surface of the irrigation catheter and proximal to the first handle.

Optionally, the blocking mechanism further comprises a syringe, a distal end of the syringe extending into the irrigation catheter and being connected to the proximal end of the catheter body, and a proximal end of the syringe extending through the second handle to an exterior of the second handle.

Optionally, the proximal end of the syringe is provided with a one-way valve.

Compared with the prior art, the medical device has the following advantages:

the medical device comprises a perfusion catheter, a blocking mechanism and a supporting mechanism; wherein the occlusion mechanism comprises a balloon and a catheter body, the balloon being disposed on an outer surface of the perfusion catheter; the catheter body is communicated with the balloon and is used for infusing an inflating agent to the balloon; the supporting mechanism comprises a supporting body and a driving body, wherein the supporting body is arranged on the outer surface of the perfusion catheter and is positioned on the proximal end side of the balloon; the driving body is connected with the supporting body and is used for driving the supporting body to expand outwards or contract inwards along the radial direction of the supporting body. When the medical device is applied to the operation treatment of aortic dissection, the catheter body is utilized to fill the balloon with an filling agent so that the balloon is filled to be attached to the inner wall of the trunk stent, the inner part of the trunk stent is divided into two parts which are not communicated with each other, and the descending aorta is blocked from returning blood, so that the blood in the descending aorta cannot enter the aortic arch and the ascending aorta in a reverse flow manner, and a clear view field is provided for the operation; the perfusion catheter is connected with an external circulator to perfuse blood of the lower half of the body of the patient, so that anastomosis operation can be performed without stopping circulation at a cryogenic temperature, the cryogenic temperature and the circulation stopping time in the operation process are obviously shortened, the damage to important organs of the lower half of the body of the patient is reduced, and the postoperative recovery of the patient is facilitated; more particularly, through setting up the support body on the perfusion catheter, and set up the support body in the proximal end side of trunk support, after the sacculus is full, and before resuming extracorporeal circulation, the driving body drives the support body expansion, in order to support the proximal end of trunk support, make the proximal end of trunk support expand again, and laminate with the inner wall of patient's autologous blood vessel, block the blood return between the outside of trunk support and autologous blood vessel on the one hand, further provide clean operation field of vision, on the other hand still facilitates the operation of coincide of doctor, shortens anastomosis time, and then shortens operation time.

Secondly, the supporting body is formed by weaving a plurality of weaving wires, and at least part of the weaving wires are metal wires. Namely, the support body is mainly made of metal materials, and the support body is ensured to have enough strength so as to effectively support the near end of the trunk support and ensure that the near end of the trunk support is expanded again to be jointed with the inner wall of the autologous blood vessel.

And thirdly, the supporting mechanism comprises a first handle, the first handle is arranged on the outer surface of the perfusion catheter and can move along the axial direction of the perfusion catheter, and the first handle is fixedly connected with the near end of the driving body, so that an operator can conveniently hold the first handle to push the driving body to move along the axial direction of the perfusion catheter. Further, the support mechanism further includes a locking assembly disposed on the first handle for selectively connecting and disconnecting with the irrigation conduit. Allowing the first handle, the driving body and the proximal end of the support body to move in the axial direction of the perfusion catheter to expand the support body when the locking assembly is disconnected from the perfusion catheter; when the support body is expanded to a proper degree to support the close contact between the near end of the trunk support and the inner wall of the autologous blood vessel, the locking assembly is connected with the perfusion catheter to prevent the first handle, the driving body and the near end of the support body from moving along the axial direction of the perfusion catheter, so that the purpose of locking the support body in an expanded state is achieved, and the anastomosis operation of an operator is facilitated.

Drawings

FIG. 1 is a schematic diagram of a medical device according to an embodiment of the present invention;

FIG. 2 is a schematic view of the medical device of FIG. 1 in use;

FIG. 3 is a schematic view of a medical device support body according to an embodiment of the present invention as it is expanded;

fig. 4 is a schematic structural view of a driving body of a support mechanism of a medical device according to an embodiment of the present invention;

FIG. 5 is a schematic structural view of a locking assembly of a support mechanism of a medical device according to one embodiment of the present invention, showing a locking portion separated from a nut;

FIG. 6 is a schematic view of a medical device according to another embodiment of the present invention;

FIG. 7 is an enlarged schematic view at A of the medical device shown in FIG. 6;

fig. 8 is a schematic view showing a state of use of the medical device shown in fig. 6.

[ reference numerals are described below ]:

10-a medical device;

100-perfusion catheter;

200-a blocking mechanism;

210-balloon, 220-catheter body, 230-syringe, 240-one-way valve;

300-a support mechanism;

310-a support;

320-a drive body;

321-an inner body, 322-a support wire, 323-an outer body;

330-a first handle;

340-a locking assembly;

341-locking part, 341 a-open slot, 341 b-buckle;

342-a nut;

400-a second handle;

20-trunk support.

Detailed Description

The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the drawings provided in the present embodiment are only for illustrating the basic idea of the present invention, and the components related to the present invention are only shown in the drawings rather than drawn according to the number, shape and size of the components in actual implementation, and the type, quantity and proportion of the components in actual implementation may be changed freely, and the layout of the components may be more complicated.

Furthermore, each of the embodiments described below has one or more technical features, and thus, the use of the technical features of any one embodiment does not necessarily mean that all of the technical features of any one embodiment are implemented at the same time or that only some or all of the technical features of different embodiments are implemented separately. In other words, those skilled in the art can selectively implement some or all of the features of any embodiment or combinations of some or all of the features of multiple embodiments according to the disclosure of the present invention and according to design specifications or implementation requirements, thereby increasing the flexibility in implementing the invention.

As used in this specification, the singular forms "a", "an" and "the" include plural referents, and the plural forms "a plurality" includes more than two 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, e.g., as meaning either fixedly connected, detachably connected, or integrally connected. Either mechanically or electrically. Either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

As used herein, the terms "proximal" and "distal" refer to the relative orientation, relative position, and orientation of elements or actions with respect to one another from the perspective of a clinician using the medical device, and although "proximal" and "distal" are not intended to be limiting, the term "proximal" generally refers to the end of the medical device that is closer to the clinician during normal operation, and the term "distal" generally refers to the end that is first introduced into a patient. Unless the content clearly dictates otherwise.

The invention aims to provide a medical device which comprises an infusion catheter, a blocking mechanism and a supporting mechanism. Wherein the occlusion mechanism includes a balloon disposed on an outer surface of the perfusion catheter and a catheter body in communication with the balloon for perfusing the balloon with a filling agent. The support mechanism includes a support body disposed on an outer surface of the irrigation catheter and proximal to the balloon, and a drive body. The driving body is connected with the supporting body and is used for driving the supporting body to expand outwards or contract inwards along the radial direction of the supporting body.

The medical device is used in conjunction with an elephant's nose stent for performing surgical treatment of an aortic dissection, such as in Sunz's surgery. Specifically, the perfusion catheter is connected with the trunk support during operation, so that the medical device is fixed in an aorta, the balloon is located in the middle of an inner cavity of the trunk support, and the support is located in a near-end inner cavity of the trunk support. The catheter body is utilized to pour filling agent into the balloon, so that the balloon is filled to be attached to the inner wall of the trunk stent, the interior of the trunk stent is divided into two parts which are not communicated with each other, namely, the descending aorta is blocked by expanding the balloon, blood in the descending aorta is prevented from flowing into an aortic arch and ascending aorta in a counter-flow manner, and a clear visual field is provided for an operation. Then, the operator controls the driving body to drive the supporting body to expand to support the near end of the trunk stent, so that the near end of the trunk stent is expanded again until the near end of the trunk stent is tightly attached to the inner wall of the autologous blood vessel, on one hand, blood return between the outer wall of the trunk stent and the near-end breach of the descending aorta can be blocked, a clean operation visual field is further provided, on the other hand, a doctor can conveniently perform subsequent anastomosis operation, and the anastomosis time is shortened. The perfusion catheter is then connected to an extracorporeal circulation machine for extracorporeal circulation. Finally, the surgeon performs anastomosis and other surgical procedures. That is to say, the medical device provided by the invention provides a clean operation visual field through the combined action of the balloon and the support body, the extracorporeal circulation is established by utilizing the perfusion catheter, the time of the deep low temperature stop circulation is reduced, and the anastomosis operation can be conveniently carried out through the action of the support body, so that the operation is facilitated.

Therefore, the surgical treatment of aortic dissection can be performed according to the following procedures: maintaining selective antegrade perfusion to the brain when the extracorporeal circulation temperature reaches about 28 ℃; then the circulation can be stopped, the aortic arch is opened, and the trunk support and the medical device are implanted; then blocking aortic blood flow with a balloon of the blocking mechanism; then the circulation is recovered, and finally the anastomosis operation and other operations are carried out. That is, when the medical device is used for the surgical treatment of aortic dissection, on one hand, the body temperature of a patient does not need to be lowered to be too low, so that the visceral function and the blood coagulation function of the patient are effectively protected, the damage of relevant organs of the patient due to long-time ischemia and hypoxia is avoided, and the complications caused by postoperative blood coagulation dysfunction are reduced. On the other hand, the blood circulation can be performed in the anastomosis process, thereby reducing the pressure of the operator caused by overlong anastomosis time. Particularly, the perfusion catheter is further provided with a supporting mechanism, and the supporting mechanism is utilized to support the near end of the trunk support, so that the near end of the trunk support is tightly attached to the inner wall of the autologous blood vessel of the patient, the anastomosis is convenient, and the operation time is further shortened.

Preferably, the support body is mainly made of a metal material, so that the support body can provide enough radial supporting force when supporting the proximal end of the trunk support, and the proximal end of the trunk support can be ensured to be expanded and tightly attached to the inner wall of the autologous blood vessel.

To further clarify the objects, advantages and features of the present invention, a more particular description of the invention will be rendered by reference to the appended drawings. It is to be noted that the drawings are in a very simplified or schematic form and are not to precise scale, which is merely for the purpose of facilitating and distinctly claiming the embodiments of the present invention. The same or similar reference numbers in the drawings identify the same or similar elements. It should also be understood that the following description is only illustrative of the preferred construction of the various components of the medical device, and that it is not intended to be a sole implementation and should not be construed as limiting the invention.

Fig. 1 is a schematic structural diagram of a medical device according to a preferred embodiment of the present invention, and fig. 2 is a schematic usage diagram of the medical device.

Referring to fig. 1, themedical device 10 includes anirrigation catheter 100, ablocking mechanism 200, and asupport mechanism 300. Wherein theperfusion catheter 100 is a hollow structure. Theblocking mechanism 200 comprises aballoon 210 and acatheter body 220, theballoon 210 is sleeved on the outer surface of theperfusion catheter 100, and thecatheter body 220 is communicated with theballoon 210 and used for perfusing an inflating agent into theballoon 210. The supportingmechanism 300 includes a supportingbody 310 and a drivingbody 320, wherein the supportingbody 310 is sleeved on the outer surface of theperfusion catheter 100 and is located at the proximal end of theballoon 210. The drivingbody 320 is connected to the supportingbody 310 for driving the supportingbody 310 to expand outward or contract inward in a radial direction thereof.

Referring to fig. 2, the procedure of performing the aortic dissection surgical treatment by using the medical device and the trunk support is as follows:

first, extracorporeal circulation is established, maintaining selective antegrade perfusion to the brain, and then the circulation is stopped.

Next, the aortic arch of the patient is opened and the elephant'snasal stent 20 is implanted in the descending aortic region of the patient's aorta, the elephant'snasal stent 20 being expanded to support the descending aortic wall.

Next, themedical device 10 is placed in the aorta and the distal end of theperfusion catheter 100 is connected to thetrunk support 20, with theballoon 210 disposed in the medial lumen of thetrunk support 20 and thesupport 310 disposed in the proximal lumen of thetrunk support 20. To facilitate connection of the two, the distal end of theperfusion catheter 100 may extend from the distal end of theballoon 210, as is well known to those skilled in the art.

Next, a filling agent is infused into theballoon 210 using thecatheter body 220 to fill theballoon 210 to conform to the inner wall of thetrunk support 20. After theballoon 210 is inflated, the inner cavity of thetrunk stent 20 is divided into two parts which are not communicated with each other, so that the blood circulation in the aorta is blocked, and the blood in the descending aorta can not enter the aortic arch and the aorta in a reverse flow mode.

Then, the drivingbody 320 is used to drive the supportingbody 310 to expand, and the expanded supportingbody 310 supports the proximal end of thetrunk stent 20, so that the proximal end of thetrunk stent 20 is tightly attached to the inner wall of the autologous blood vessel of the patient, and the blood return between the outer side of thetrunk stent 20 and the proximal laceration of the descending aorta is blocked.

Theperfusion catheter 100 is then connected to an extracorporeal circulation machine to restore extracorporeal circulation.

Finally, performing anastomosis operation and other operation operations.

That is, in the medical device provided by the embodiment of the present invention, theballoon 210 is used to block the aortic blood flow and prevent the aortic blood from flowing back, and thesupport 310 is used to support the proximal end of thetrunk stent 20 and block the blood from flowing back between thetrunk stent 20 and the proximal laceration of the descending aorta, so as to provide a clean and clear surgical field at the aortic arch and ascending aorta. Theperfusion catheter 100 can be used to restore extracorporeal circulation, reducing the time for stopping circulation, thereby not needing to reduce the body temperature of the patient to be too low, effectively protecting the visceral function and the blood coagulation function of the patient, and greatly reducing the complications caused by blood coagulation dysfunction after the operation. In addition, thesupport body 310 is utilized to support the near end of thetrunk support 20, so that thetrunk support 20 is attached to the inner wall of the autologous blood vessel, the anastomosis operation of doctors is facilitated, the anastomosis time is shortened, and the operation time is further shortened.

In this embodiment, theperfusion catheter 100 is used for perfusing the lower body of the patient with blood, and therefore, theperfusion catheter 100 is made of a flexible medical polymer tube with bending resistance, so that theperfusion catheter 100 can enter any angle of the descending aorta and is used for blood circulation. In this embodiment, the diameter of theperfusion catheter 100 is 8mm to 12 mm. Theballoon 210 can be a compliant balloon which can be expanded according to the size of thetrunk support 20 until the compliant balloon is tightly attached to the inner wall of thetrunk support 20 to block the descending aorta from blood return.

The supportingbody 310 has an expanded state and a contracted state, and the operator switches the supportingbody 310 between the expanded state and the contracted state by driving the drivingbody 320 to drive the proximal end of the supportingbody 310 to move along the axial direction of theperfusion catheter 100. Specifically, the drivingbody 320 is sleeved on the outer surface of theperfusion catheter 100 and can move along the axial direction of theperfusion catheter 100. The distal end of the supportingbody 310 is fixedly connected to theperfusion catheter 100, such that the distal end of the supportingbody 310 and theperfusion catheter 100 are kept stationary, and the proximal end of the supportingbody 310 and the distal end of the drivingbody 320 are fixedly connected, such that the proximal end of the supportingbody 310 can move synchronously with the drivingbody 320. Thesupport mechanism 300 is configured to: when the drivingbody 320 moves toward the distal end of theirrigation catheter 100, the proximal end of the supportingbody 310 moves toward the distal end of theirrigation catheter 100 in synchronization with the drivingbody 320, so that the supportingbody 310 is deformed to the expanded state. When the drivingbody 320 moves toward the proximal end of theinfusion catheter 100, the proximal end of the supportingbody 310 moves toward the proximal end of theinfusion catheter 100 in synchronization with the drivingbody 320, so that the shape of the supportingbody 310 is restored to the contracted state.

The diameter of thesupport body 310 in the contracted state is 9mm-13mm, and the maximum diameter of thesupport body 310 in the expanded state can reach 35mm-40mm, and the diameter of thesupport body 310 is enough to support the proximal end of thetrunk stent 20 to be attached to the inner wall of the patient's own blood vessel. Further, thesupport body 310 is mainly made of metal material, so that when thesupport body 310 is in the expanded state, sufficient supporting force can be provided for the proximal end of thetrunk stent 20, and the proximal end of thetrunk stent 20 is attached to the inner wall of the autologous blood vessel of the patient.

In an alternative embodiment, as shown in fig. 3, the supportingbody 310 is formed by knitting a plurality of knitting yarns, and at least a portion of the knitting yarns are metal yarns, preferably all of the knitting yarns are metal yarns. The wires are made of a shape memory alloy, such as nitinol, and the deformation and recovery of thesupport body 310 can be achieved by the high elasticity of the shape memory alloy, so that thesupport body 310 can be switched between the expanded state and the contracted state. As shown in FIG. 3, when thesupport body 310 is in the expanded state, thesupport body 310 has a cage-like structure, and as shown in FIG. 1, when thesupport body 310 is in the contracted state, thesupport body 310 has a tube network structure. In this embodiment, the distal end of the supportingbody 310 may be fixedly connected to theperfusion catheter 100 by a snap ring, and the proximal end of the supportingbody 310 may be fixedly connected to the distal end of the drivingbody 320 by a snap ring.

The drivingbody 320 moves along the axial direction of theperfusion catheter 100, and needs to have good flexibility and good supporting force, so that the drivingbody 320 can push the proximal end of the supportingbody 310 to move while following the bending of theperfusion catheter 100, so as to switch the supportingbody 310 from the contracted state to the expanded state. Therefore, as shown in fig. 4, the drivingbody 320 preferably includes aninner tube 321, asupport wire 322, and anouter tube 323. Theinner tube 321 and theouter tube 323 are both polymer tubes, thesupport wire 322 is spirally wound on the outer surface of theinner tube 321, and theouter tube 323 is sleeved on theinner tube 321 to cover thesupport wire 322. The flexibility of the drivingbody 320 is improved by the polymer tubes of the inner and outer layers, and the supporting force is improved by the supportingwires 322, so that the driving body and the supporting wires are balanced.

Further, referring back to fig. 1, the supportingmechanism 300 further includes afirst handle 330, thefirst handle 330 has a lumen extending axially therethrough, theperfusion catheter 100 movably extends through the lumen of thefirst handle 330, such that thefirst handle 330 is sleeved on the outer surface of theperfusion catheter 100 and can move along the axial direction of theperfusion catheter 100. Thefirst handle 330 is fixedly connected to a proximal end of the drivingbody 320. The operator holds thefirst handle 330, and pushes thefirst handle 330 to move along the axial direction of theperfusion catheter 100, so that the drivingbody 320 moves, thereby facilitating the operation.

Still further, with continued reference to fig. 1, thesupport mechanism 300 further includes a lockingassembly 340, the lockingassembly 340 being disposed on thefirst handle 330 for selectively connecting and disconnecting with theperfusion catheter 100. When the lockingassembly 340 is connected to theperfusion catheter 100, the proximal ends of thefirst handle 330, the drivingbody 320 and the supportingbody 310 are prevented from moving along the axial direction of theperfusion catheter 100. When the lockingassembly 340 is disconnected from theperfusion catheter 100, thefirst handle 330, the drivingbody 320 and the proximal end of the supportingbody 310 are allowed to move along the axial direction of theperfusion catheter 100. That is, the lockingassembly 340 may be used to lock the supportingbody 310 such that when the supportingbody 310 is in the expanded state and the proximal end of thetrunk stent 20 is closely fitted to the inner wall of the patient's own blood vessel, the lockingassembly 340 is connected to theperfusion catheter 100 to maintain the supportingbody 310 in the expanded state, thereby continuously blocking the blood return between thetrunk stent 20 and the laceration of the proximal end of the descending aorta during the operation and facilitating the operator to perform the anastomosis operation conveniently and quickly.

Fig. 5 shows a schematic view of analternative locking assembly 340. As shown in fig. 5, the lockingassembly 340 includes a lockingportion 341 and anut 342, and the lockingportion 341 is fixedly disposed at the proximal end of thefirst handle 330. The lockingportion 341 is a hollow tubular structure and is disposed on the outer surface of theperfusion catheter 100. An external thread is formed on an outer surface of the lockingportion 341, and a plurality ofopen grooves 341a are formed at a proximal end of the lockingportion 341 to divide a proximal sidewall of the lockingportion 341 into a plurality ofbuckles 341 b. Thenut 342 is sleeved on the outer surface of the lockingportion 341 and is in threaded connection with the lockingportion 341, and by tightening thenut 342, thenut 342 radially presses thebuckle 341b, so that thebuckle 341b presses the outer surface of theperfusion catheter 100, and the connection with theperfusion catheter 100 is realized.

Generally, thesupport 310 is in the collapsed state prior to use of themedical device 10. Therefore, when performing an operation using themedical device 10, the operator pushes thefirst handle 330 toward the distal end of theperfusion catheter 100 to drive the drivingbody 320 to move, so as to drive the proximal end of the supportingbody 310 to move toward the distal end of theperfusion catheter 100, so that the supportingbody 310 is deformed to the expanded state to support the proximal end of thetrunk support 20. The operator then rotates thenut 342 to connect the lockingassembly 340 with theinfusion catheter 100 to lock thesupport 310, after which the operator may perform an anastomosis procedure.

Referring back to fig. 1, in the present embodiment, the outer diameter of thecatheter body 220 is smaller than the inner diameter of theperfusion catheter 100, and preferably, thecatheter body 220 is disposed in theperfusion catheter 100, and the distal end of thecatheter body 220 penetrates the distal sidewall of theperfusion catheter 100 and then communicates with theballoon 210. In other words, in this embodiment, thecatheter body 220, theperfusion catheter 100 and the drivingbody 320 are nested, so that themedical device 10 is compact and avoids being entangled.

With continued reference to fig. 1, themedical device 10 further includes asecond handle 400, thesecond handle 400 fixedly disposed on theinfusion catheter 100 and located proximal to thefirst handle 330. Theblocking mechanism 200 further includes aninjection tube 230, a distal end of theinjection tube 230 extends into theperfusion catheter 100 after penetrating through the sidewall of theperfusion catheter 100 and is connected to the proximal end of thecatheter body 220, and a proximal end of theinjection tube 230 extends out of thesecond handle 400 and extends to the outside of thesecond handle 400. Theballoon 210 is inflated by infusing an inflation agent into theballoon 210 through thesyringe tube 230 in conjunction with a syringe. The provision of thesecond handle 400 facilitates the injection operation. Further, the proximal end of theinjection tube 230 is provided with a one-way valve 240, and when theballoon 210 is inflated to a suitable size, the inflation agent is prevented from being discharged from theballoon 210 by the one-way valve 240. The one-way valve 240 may be attached to the proximal end of thesyringe tube 230 by UV glue.

In other embodiments, thesyringe 230 is a helical structure. Referring to fig. 6 to 8, thefirst handle 330 is a hollow structure, theinjection tube 230 is spirally wound inside thefirst handle 330, and the distal end of theinjection tube 230 extends into theperfusion catheter 100 after penetrating the sidewall of theperfusion catheter 100 and is connected to the proximal end of thecatheter body 220. The proximal end of thesyringe 230 extends out of thefirst handle 330 to the outside of thefirst handle 330. A one-way valve 240 is provided on the proximal end of thesyringe tube 230. In this embodiment, theinjection tube 230 is made of medical grade PVC material, which can be stretched and deformed, so that when the operator drives thefirst handle 330 to move towards the distal end of theperfusion catheter 100, the proximal end of theinjection tube 230 can be stretched and deformed along with the synchronous movement of thefirst handle 330, the connection between the distal end of theinjection tube 230 and thecatheter body 220 is kept relatively stationary, and when the operator drives thefirst handle 330 to move towards the proximal end of theperfusion catheter 100, theinjection tube 230 can rebound. Further, it should be understood that for theinjection tube 230, the distal end refers to the end connected to thecatheter body 220 and the proximal end refers to the end away from thecatheter body 220.

The medical device provided by the embodiment of the invention comprises an infusion catheter, a blocking mechanism and a supporting mechanism. The blocking mechanism comprises a balloon and a catheter body, the balloon is sleeved on the outer surface of the perfusion catheter, and the catheter body is communicated with the balloon and used for perfusing an inflating agent into the balloon. The supporting mechanism comprises a supporting body and a driving body, the supporting body is sleeved on the outer surface of the perfusion catheter and is located at the near end of the balloon, and the driving body is connected with the supporting body and used for driving the supporting body to radially expand outwards or contract inwards along the supporting body. When the operation treatment of the aortic dissection is carried out, the medical device blocks the blood return of the descending aorta by using the balloon, and re-expands the near end of the trunk stent by using the support body so as to block the blood return between the outer wall of the trunk stent and the crevasse of the near end of the descending aorta and provide a clean and clear operation visual field. The perfusion catheter is used for extracorporeal circulation, so that the deep low temperature circulation stopping time is shortened, the possibility that important organs of the lower half of a patient are damaged due to low temperature and ischemia is reduced, and the postoperative recovery of the patient is facilitated. In addition, under the effect of supporter, the near-end of trunk support closely laminates with the inner wall of patient's autologous blood vessel, and the doctor of being convenient for carries out the anastomosis operation, can shorten the operation time. Namely, when the medical device is applied to the operation treatment of the aortic dissection, the injury to the organs of a patient can be reduced, the operation of an operator is convenient, and the pressure of the operator is reduced.

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, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (12)

1. A medical device, comprising:

a perfusion catheter;

the blocking mechanism comprises a balloon and a catheter body; the balloon is disposed on an outer surface of the perfusion catheter; the catheter body is communicated with the balloon and is used for infusing an inflating agent to the balloon; and the number of the first and second groups,

a support mechanism comprising a support body and a drive body, the support body being disposed on an outer surface of the perfusion catheter and on a proximal side of the balloon; the driving body is connected with the supporting body and used for driving the supporting body to expand outwards or contract inwards along the radial direction of the supporting body.

2. The medical device of claim 1, wherein the driving body is sleeved on an outer surface of the perfusion catheter and is capable of moving in an axial direction of the perfusion catheter; the far end of the supporting body is fixedly connected with the perfusion catheter, and the near end of the supporting body is fixedly connected with the far end of the driving body;

the support mechanism is configured to: when the driving body moves towards the distal end of the perfusion catheter, the driving body drives the proximal end of the supporting body to move towards the distal end of the perfusion catheter, so that the supporting body is deformed and expanded; when the driving body moves towards the proximal end of the perfusion catheter, the driving body drives the proximal end of the supporting body to move towards the proximal end of the perfusion catheter, so that the supporting body is contracted.

3. The medical device of claim 2, wherein the support is woven from a plurality of woven filaments, and at least some of the woven filaments are metallic filaments.

4. The medical device of any one of claims 1-3, wherein the support body has a maximum diameter of 35mm-40mm when expanded.

5. The medical device of claim 2, wherein the support mechanism further comprises a first handle disposed on an outer surface of the infusion catheter and movable in an axial direction of the infusion catheter, and the first handle is fixedly connected to a proximal end of the driving body.

6. The medical device of claim 5, wherein said support mechanism further comprises a locking assembly disposed on said first handle for selective coupling and decoupling with said infusion catheter;

the support mechanism is configured to: when the locking assembly is connected with the perfusion catheter, the first handle, the driving body and the proximal end of the supporting body are prevented from moving along the axial direction of the perfusion catheter; when the locking assembly is disconnected with the perfusion catheter, the first handle, the driving body and the proximal end of the supporting body are allowed to move along the axial direction of the perfusion catheter.

7. The medical device of claim 6, wherein the locking assembly comprises a locking portion and a nut; the locking part is arranged at the near end of the first handle and is of a hollow tubular structure, external threads are arranged on the locking part, and a plurality of open grooves are formed in the near end of the locking part; the nut is used for being sleeved on the outer surface of the locking portion and is in threaded connection with the locking portion.

8. The medical device of claim 5, wherein the catheter body is disposed through an interior of the perfusion catheter, and a distal end of the catheter body extends through a distal tube wall of the perfusion catheter to communicate with the balloon.

9. The medical device of claim 8, wherein said blocking mechanism further comprises a syringe helically wound inside said first handle with a distal end extending into said infusion catheter and connected to a proximal end of said catheter body, said proximal end extending through said first handle to an exterior of said first handle;

the proximal end of the syringe moves synchronously with the first handle as the first handle moves toward the distal end of the infusion catheter to stretch deform the syringe.

10. The medical device of claim 8, further comprising a second handle disposed on an outer surface of the irrigation catheter and proximal to the first handle.

11. The medical device of claim 10, wherein the blocking mechanism further comprises a syringe, a distal end of the syringe extending into the irrigation catheter and coupled to a proximal end of the catheter body, the proximal end of the syringe extending through the second handle to an exterior of the second handle.

12. A medical device according to claim 9 or 11, wherein the proximal end of the syringe is provided with a one-way valve.

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