CN114617591A

CN114617591A - Medical thread cutting device

Info

Publication number: CN114617591A
Application number: CN202011459556.9A
Authority: CN
Inventors: 李阳; 梁伟林; 张庭超
Original assignee: Hangzhou Valgen Medtech Co Ltd
Current assignee: Hangzhou Valgen Medtech Co Ltd
Priority date: 2020-12-11
Filing date: 2020-12-11
Publication date: 2022-06-14

Abstract

The application relates to the technical field of medical equipment, in particular to a medical thread cutting device. The medical thread cutting device comprises a thread cutting assembly and a matching and stopping piece, wherein the thread cutting assembly comprises a fixing piece and a blade connected to the fixing piece, and the matching and stopping piece comprises a base part and a guide part. The base part is provided with a tangent line matching surface, the fixing part is movably sleeved on the guide part, the blade is provided with a cutting edge, and at least part of the medical line is positioned between the cutting edge and the tangent line matching surface; when the fixing piece moves relative to the guide part to drive the cutting edge of the blade to abut against the tangent line matching surface, at least part of the medical line abuts against the tangent line matching surface and is cut off by the cutting edge. The medical thread cutting device is easy to cut off a medical thread, and the thread squeezing condition between the blade and the thread cutting matching surface in the thread cutting process is avoided.

Description

Medical thread cutting device

Technical Field

The application relates to the technical field of medical equipment, in particular to a medical thread cutting device.

Background

In conventional surgical procedures, it is often necessary to cut medical threads (e.g., sutures, repair threads for artificial chordae, repair threads for valve edge-to-edge repair, etc.), typically manually by a physician under open-surgical conditions.

With the progress of the technology, various minimally invasive surgeries and interventional surgeries, such as endoscopic surgeries and transcatheter interventional surgeries, are increasingly common, which only need to cut a small operation window on the body of a patient, so that instruments such as an endoscope or an interventional catheter are inserted into the body of the patient to reach a predetermined position for treatment, and if a medical line in the body of the patient needs to be cut, an operator needs to remotely operate outside the body of the patient through the small operation window to cut the line.

The existing medical thread cutting device usually adopts a structural form similar to scissors, and when the thread is cut, the medical thread is suspended, so that the following defects exist:

(1) the medical thread is not easy to cut off due to the lack of a stable acting point of the blade;

(2) by adopting a mode similar to cutting of scissors, the medical thread is easy to be squeezed and difficult to release and release, so that the whole thread cutting device is prevented from being withdrawn, and the risk of pulling organ tissues exists.

Disclosure of Invention

In order to solve the technical problems that a medical thread is not easy to cut off and is easy to clamp, the application provides a medical thread cutting device.

The application provides a medical tangent line device includes tangent line subassembly and joins in marriage the piece of stopping.

The tangent line subassembly includes the mounting and connects in the blade of mounting. The counter stop includes a base and a guide.

The base part is provided with a tangent line matching surface, the fixing part is movably sleeved on the guide part, the blade is provided with a cutting edge, and at least part of the medical line is positioned between the cutting edge and the tangent line matching surface; when the fixing piece moves relative to the guide part to drive the cutting edge of the blade to abut against the tangent line matching surface, at least part of the medical line abuts against the tangent line matching surface and is cut off by the cutting edge.

Compared with the prior art, the technical scheme provided by the application has the following advantages:

the medical thread is easy to cut off, and the thread extrusion between the blade and the matching surface of the thread cutting in the thread cutting process is avoided. Specifically, in the cutting process of the medical cutting device, the fixing piece moves relative to the guide part of the matching and stopping piece so as to drive the cutting edge of the blade to abut against the cutting matching surface of the matching and stopping piece, the cutting matching surface provides abutting for the medical line and provides an acting point for the cutting edge of the blade, and the medical line is easy to cut off; meanwhile, the cutting edge of the blade and the tangent matching surface are in mutual abutting relationship, so that a mutual staggered relationship similar to that of scissors is avoided, the abnormal condition of thread extrusion does not exist between the blade and the tangent matching surface, the medical thread cutting device can be guaranteed to withdraw smoothly, and the risk of organ tissue dragging due to thread extrusion is avoided.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.

In the drawings:

fig. 1 is a schematic overall structure diagram of a medical thread cutting device according to a first embodiment of the present application;

fig. 2 is a schematic cross-sectional view illustrating the structure of the distal end of the medical thread cutting device and the routing of the medical thread according to the first embodiment of the present application;

fig. 3 is a cross-sectional view showing the structure of the distal end of the medical thread cutting device according to the first embodiment of the present application and cutting the medical thread;

FIG. 4 is a schematic perspective view illustrating a tangent line assembly engaged with a mating member according to an embodiment of the present disclosure;

FIG. 5 is a schematic top view of the tangent line assembly and the stop member of FIG. 4;

FIG. 6 is a schematic view illustrating a connection between a tangent line assembly and a driving wire set according to an embodiment of the present application;

FIG. 7 is a schematic perspective view of a tangent line assembly according to an embodiment of the present application;

FIG. 8 is a schematic perspective view of a stopping member according to an embodiment of the present disclosure;

FIG. 9 is a schematic view of a three-dimensional structure inside a handle according to an embodiment of the present application;

FIG. 10 is a schematic view of the connection between the outer support tube assembly and the outer tube securing member according to one embodiment of the present application;

FIG. 11 is a schematic view of the connection between the flexible inner tube and the inner tube securing member according to an embodiment of the present application;

fig. 12 is a schematic cross-sectional view illustrating the structure of the distal end of the medical thread cutting device and the routing of the medical thread according to the second embodiment of the present application;

fig. 13 is a schematic sectional view showing the structure of the distal end of the medical thread cutting device according to the second embodiment of the present application and cutting the medical thread;

FIG. 14 is a schematic perspective view illustrating a tangent line assembly engaged with a mating member according to a second embodiment of the present application;

FIG. 15 is a schematic perspective view of a stopping member according to a second embodiment of the present application;

fig. 16 is a schematic perspective view illustrating a tangent line assembly and a driving wire set according to a second embodiment of the present application;

FIG. 17 is a schematic view of a first blade configuration in a medical thread cutting device according to the present application;

FIG. 18 is a schematic view of a second blade in the medical wire cutting device of the present application;

FIG. 19 is a schematic view of a third blade in the medical wire cutting device of the present application;

fig. 20 is a schematic perspective view illustrating the thread cutting assembly and the mating member of the third medical thread cutting device according to the present application;

fig. 21 is a schematic perspective view illustrating a distal structure of a medical thread cutting device according to a third embodiment of the present application and a medical thread routing;

fig. 22 is a perspective view showing a distal end structure of a medical thread cutting apparatus according to a third embodiment of the present application and a medical thread cut.

Detailed Description

For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings. In the following description, it is to be understood that the orientations and positional relationships indicated by "front", "rear", "upper", "lower", "left", "right", "longitudinal", "lateral", "vertical", "horizontal", "top", "bottom", "inner", "outer", "leading", "trailing", and the like are configured and operated in specific orientations based on the orientations and positional relationships shown in the drawings, and are only for convenience of describing the present invention, and do not indicate that the device or element referred to must have a specific orientation, and thus, are not to be construed as limiting the present invention.

It is also noted that, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," "disposed," and the like are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or may be connected through the use of two elements or the interaction of two elements. When an element is referred to as being "on" or "under" another element, it can be "directly" or "indirectly" on the other element or intervening elements may also be present. The terms "first", "second", "third", etc. are only for convenience in describing the present technical solution, and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated, whereby the features defined as "first", "second", "third", etc. may explicitly or implicitly include one or more features. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, structures, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.

In the description of the present invention, it should be noted that, in the field of interventional medical devices, the proximal end refers to the end closer to the operator, and the distal end refers to the end farther from the operator; axial refers to a direction parallel to the line connecting the center of the distal end and the center of the proximal end of the medical device, radial refers to a direction perpendicular to the axial direction, and circumferential refers to a direction around the axial direction. The above definitions are for convenience only and should not be construed as limiting the present invention.

Example one

Referring to fig. 1 to 4, the present embodiment provides a medical thread cutting device, which includes a thread cutting assembly 100, a mating member 200, a driving wire set 300, a connecting sleeve 500, a flexible inner core 400, an outer support tube assembly 600, and a handle 700. The tangent assembly 100, the stopping member 200 and the driving wire set 300 are respectively arranged in the outer support tube assembly 600, and the proximal end of the flexible inner core 400 penetrates out of the outer support tube assembly 600 and then is connected with the control member 710 on the handle 700.

Referring to fig. 2 to 4, fig. 7 and fig. 9, the cutting line assembly 100 includes a fixing member 110 and a blade 120 fixedly connected to the fixing member 110. The fitting 200 includes a base 220 and a guide 210, and a distal end of the base 220 is provided with a tangential fitting surface 221. The fixing element 110 is movably sleeved on the guiding portion 210, and the tangential engaging surface 221 is located at a near side of the fixing element 110.

The distal end of the flexible inner core 400 is fixedly connected with the proximal end of the connecting sleeve 500, the distal end of the connecting sleeve 500 is fixedly connected with the proximal end of the driving wire set 300, and the distal end of the driving wire set 300 is fixedly connected with the fixing member 110.

When the medical thread cutting device is used, the medical thread 800 penetrates through the guiding part 210, and the part of the medical thread 800 penetrating through the guiding part 210 is positioned between the cutting edge of the blade 120 and the tangent matching surface 221, the operator controls the thread cutting assembly 100 to move relative to the guiding part 210 by operating the operating part 710, so that the cutting edge of the blade 120 is abutted against the tangent matching surface 221, the part of the medical thread 800 penetrating through the guiding part 210 is abutted against the tangent matching surface 221, and the cutting edge of the blade 120 cuts off the medical thread 800.

Specifically, referring to fig. 4-7, the fixing member 110 is provided with an axially extending inner cavity 111, and the inner cavity 111 axially penetrates through the fixing member 110. The fixing member 110 is provided at the side in the axial direction with a mounting groove 113, and the mounting groove 113 extends from the proximal end of the fixing member 110 toward the distal end of the fixing member 110. The distal end of the blade 120 is fixedly connected to the fixing member 110, and the proximal end of the blade 120 is provided with a sharp cutting edge, and the cutting edge of the blade 120 extends proximally relative to the fixing member 110.

The connection mode of the blade 120 and the fixing member 110 is not limited, and may be welding, clamping, etc. In this embodiment, in order to facilitate the installation and positioning of the blade 120, a protrusion may be disposed at a distal end of the blade 120, and the fixing member 110 is provided with a recess matched with the protrusion, and the protrusion is clamped into the recess.

Referring to fig. 4, 5 and 8, the base 220 is located at the proximal end of the mating member 200, and the guide extends axially from the base 220 toward the distal end of the mating member 200. At least one pair of guiding and sliding surfaces which are mutually matched is arranged between the guiding part 210 and the fixing part 110, two opposite side surfaces of the guiding part 210 in the axial direction are planes, a surface positioned between the two planes is an arc surface, and the arc surface is connected with the planes. In other embodiments, the guide portion 210 may have other structures that enable the fixing member 110 to move axially thereon.

The distal end of the base 220 is generally cylindrical. The proximal end of the base 220 is generally conical and tapers in radial dimension from distal to proximal. Both sides of the base 220 are respectively provided with a guide groove 22 axially symmetrical with respect to the base. A tangential mating surface 221 is located at the distal end of the base 220. The guiding portion 210 is provided with a wire passing hole 222 and a side hole 223, the wire passing hole 222 extends from the distal end of the guiding portion 210 to the proximal end of the guiding portion 210, preferably, in the embodiment, the wire passing hole 222 extends axially to be approximately flush with the tangent matching surface 221, the side hole 223 penetrates through the wire passing hole 222, and the axis of the side hole 223 is parallel to the tangent matching surface 221. It will be understood by those skilled in the art that the axial directions of the wire through hole 222 and the side hole 223 can be changed in other embodiments, as long as the two holes are ensured to be communicated and the side hole 223 penetrates through the plane on the guiding portion 210.

Referring to fig. 3, 5 and 8, in the present embodiment, the cutting edge width of the blade 120 is a, the width of the side hole 223 is b, the number of strands of the medical thread to be cut is n, and the diameter of the medical thread is d. The medical wire is pressed by the matching surface 221 of the cutting edge and the tangent line and then is changed from a cylindrical shape to a flat shape, and the maximum width of the medical wire can reach w ═ pi d/2, namely half of the perimeter. In the embodiment, a is larger than or equal to b, and b is larger than or equal to n x (pi d/2), so that the medical line is prevented from being separated from the cutting range of the cutting edge of the blade 120, the medical line is prevented from being excessively stacked in the side hole 223, all the medical lines penetrating through the side hole 223 can be cut off by the cutting edge of the blade 120, and the driving force required by cutting is reduced.

In the present embodiment, as shown in fig. 7 and 8, the tangential engagement surface 221 is a substantially circular plane surrounding the guiding portion 210. It is understood that the present application does not limit the specific shape of the tangential engagement surface 221, and in other embodiments, the tangential engagement surface 221 may have a shape similar to a rectangle, a trapezoid, or a diamond. On the basis of meeting the requirement that the tangential matching surface 221 is matched with the cutting edge of the blade 120, the form of the tangential matching surface 221 can be changed according to the shape of the cutting edge of the blade 120, such as: the cutting edge of blade 120 can set up to the arc, and tangent line fitting surface 221 sets up to the cambered surface with the blade looks adaptation of blade 120, can guarantee that the cutting edge of blade 120 can support completely to press on tangent line fitting surface 221 can. The tangent mating surface 221 may be surface hardened by quenching or surface coating, such as nickel titanium coating or diamond coating, to improve the surface hardness and wear resistance of the tangent mating surface 221, thereby providing a firm and reliable force point for the cutting edge of the blade 120 and prolonging the service life of the tangent mating surface 221. The fitting 200 may be made of stainless steel, nickel-titanium alloy, cobalt-chromium alloy, or tungsten alloy, and in this embodiment, the material of the fitting 200 is stainless steel. Notably, to enable the tangential mating surface 221 to provide a point of force for each point on the cutting edge of the blade 120 to sever all of the medical wire 800.

Referring to fig. 4-8, the guiding portion 210 is disposed through the inner cavity 111 of the fixing member 110, and the guiding portion 210 is axially slidably engaged with the fixing member 110. The arc surface on the guiding portion 210 serves as a guiding and sliding surface between the guiding portion 210 and the fixing element 110, and the plane surface on the guiding portion 210 serves as both a guiding and sliding surface and a rotation stopping surface to limit the relative rotation between the fixing element 110 and the guiding portion 210. After the fixing member 110 is engaged with the guiding portion 210, the blade 120 is located above the plane of the guiding portion 210, the cutting edge of the blade 120 faces the tangent engaging surface 221, and preferably the blade 120 is perpendicular or nearly perpendicular to the tangent engaging surface 221. The distal end of the driving wire set 300 is fixedly connected to the mounting groove 113 of the fixing member 110, the driving wire set 300 extends toward the proximal end and passes through the guide groove 224 of the mating member 200, and the driving wire set 300 is in clearance fit with the guide groove 224, so that the driving wire set 300 can slide axially along the guide groove 224. When the thread is cut, the driving wire set 300 is controlled to move axially and proximally, and the driving wire set 300 pulls the fixing member 110 to move axially towards the guiding portion 210. In order to ensure the stability of the axial movement of the fixing member 110, two driving wire sets 300 may be provided, the two driving wire sets 300 are symmetrically disposed about the axial direction of the fixing member 110 and the mating member 200, and correspondingly, two mounting grooves 113 and two guide grooves 224 are respectively provided, the two mounting grooves 113 are symmetrically disposed at both sides of the axial direction of the fixing member 110, and the two guide grooves 224 are symmetrically disposed at both sides of the axial direction of the base portion 220. The proximal ends of the two driving wire sets 300 are fixedly connected with the connecting sleeve 500.

Referring to fig. 1, 9, 10 and 11, the handle 700 further includes an upper shell 720, a lower shell 730, an outer tube fixing member 740, an inner tube fixing member 750, an inner core connecting member 760 and an elastic member 770; control 710 includes button connector 712 and control button 711; the outer support tube assembly 600 includes a sleeve 610, a flexible outer tube 620, and a restraint pin 630.

Specifically, the upper shell 720 and the lower shell 730 are connected in a snap-fit manner to form a shell of the handle 700; the outer tube fixing member 740, the inner tube fixing member 750, the inner core connecting member 760 and the elastic member 770 are all installed inside the housing; the proximal end of the flexible outer tube 620 is connected to the outer tube fixing member 740, which may be, but not limited to, an adhesive; the flexible inner core 400 penetrates out of the flexible outer tube 620 and then extends into the shell, and the proximal end of the flexible inner core 400 is fixedly connected with an inner core connecting piece 760; the button connector 712 is sleeved on the proximal end of the inner core connector 760, and the button connector 712 is fixedly connected with the inner core connector 760; the control button 711 is fixedly connected with the button connecting piece 712, and the control button 711 extends out of the upper shell 720; the elastic member 770 is compressed between the button connection part 712 and the inner wall of the lower case 730, and the elastic member 770 provides a restoring force of the control button 711, so that the control button 711 always tends to restore its original position. The elastic member 770 may be disposed at a proximal side of the control button 711 or at a distal side of the control button 711, and in this embodiment, a spring is preferably used as the elastic member 770, one end of the spring is connected to the button connecting member 712, and the other end of the spring abuts against the inner wall of the lower case 730.

In this embodiment, the flexible inner core 400 is a flexible body with anti-torsion support force, preferably a flexible body such as a laser cutting pipe, a spring, and a multilayer solid mandrel, and in this case, the flexible inner core 400 is a solid mandrel formed by winding a plurality of layers of flexible wires.

With reference to fig. 2, 3, 4 and 10, the thread cutting assembly 100 and the stopping member 200 are accommodated in the sleeve 610, and the base portion 220 of the stopping member 200 partially protrudes out of the sleeve 610 towards the proximal direction; the sleeve 610 is provided with a wire inlet hole 611 and a wire outlet hole 612, the wire inlet hole 611 is communicated with the wire passing hole 222, and the wire outlet hole 612 is correspondingly communicated with the side hole 223; the distal end of the flexible outer tube 620 is fixedly connected to the proximal end of the sleeve 610; the base 220 is provided with a pin hole (not labeled), the limit pin 630 passes through the pin hole, the sleeve 610 is provided with a fixing hole corresponding to the position of the limit pin 630, and two ends of the limit pin 630 are inserted into the fixing holes of the sleeve 610 and fixed with the sleeve 610 by welding and the like, so that the fixed connection between the sleeve 610 and the mating member 200 is realized.

The flexible outer tube 620 may be a spring tube, the material of the flexible outer tube 620 may be stainless steel, nickel-titanium alloy, cobalt-chromium alloy or tungsten alloy, and in this embodiment, the material of the flexible outer tube 620 is stainless steel. In order to reduce the friction between the flexible inner core 400 and the flexible outer tube 620 when the wire cutting assembly 100 is driven, the flexible inner core 400 may be further sleeved with a smooth flexible inner tube 410, a distal end of the flexible inner tube 410 extends to a position close to a proximal end of the connection sleeve 500, a proximal end of the flexible inner tube 410 extends out of the flexible outer tube 620 and into the housing, and a proximal end of the flexible inner tube 410 is fixedly connected to the inner tube fixing member 750. The flexible inner tube 410 may be made of a polymer material with a low friction coefficient, such as a PEEK tube, a Pebax tube, a PTFE tube, or the like, and the PTFE tube is selected in this embodiment, where PEEK refers to polyetheretherketone, Pebax refers to polyether block polyamide, and PTFE refers to polytetrafluoroethylene.

Referring to fig. 1, 2, 3, 9, 10 and 11, a medical thread 800 may pass through the thread inlet hole 611 and the thread outlet hole 222, and pass out of the side hole 223 and the thread outlet hole 612, and a portion of the medical thread 800 passing out of the side hole 223 is located between the cutting edge of the blade 120 and the tangent matching surface 221; during cutting, an operator pulls the control button 711 towards the near end, the control button 711 transmits pulling force to the flexible inner core 400, the flexible inner core 400 pulls the fixing piece 110 to move towards the near end through the connecting sleeve 500 and the driving wire set 300, the blade 120 presses the medical wire 800 against the tangent matching surface 221, and then the control button 711 is further pulled towards the near end, so that the medical wire 800 is cut off from the tangent matching surface 221 by the cutting edge of the blade 120; after the pulling force is stopped being applied to the control button 711, the control button 711 is reset under the elastic force provided by the elastic member 770, and drives the flexible inner core 400, the connection sleeve 500, the driving wire set 300 and the fixing member 110 to move towards the far end, so that the cutting edge of the blade 120 is separated from the tangent matching surface 221, and the tangent operation is completed.

In this embodiment, the fixing member 110 is pulled by the driving wire set 300 to move axially along the guiding portion 210 toward the proximal end, the cutting edge of the blade 120 presses the medical wire 800 against the tangent matching surface 221 to cut off the medical wire, and the tangent matching surface 221 provides a pressing point for the medical wire 800 and provides a pressing point for the cutting edge of the blade 120, so that the medical wire 800 is easily cut off; meanwhile, because the cutting edge of the blade 120 and the tangent matching surface 221 are mutually pressed, a mutual staggered relationship similar to that of a scissors is not generated, so that the abnormal condition of thread extrusion does not exist between the blade 120 and the tangent matching surface 221, the medical thread cutting device can be ensured to withdraw smoothly, and the risk of dragging organ tissues due to thread extrusion is avoided. In addition, because the flexible inner core 400 needs to be inserted into the body, the flexible inner core 400 can be bent to conform to the bending of the human body lumen, in the embodiment, the driving mode of the blade 120 is set to be a back-pulling mode towards the proximal end, the pulling force is easier to transmit on the flexible inner core 400, the loss is smaller, and the driving force needed when the blade 120 cuts the line is smaller and more labor-saving.

Taking the tricuspid valve edge-to-edge repair as an example, the medical tangent device in the embodiment is used as follows:

the first step is as follows: a plurality of medical wires which are implanted on three valve leaflets of the tricuspid valve and fixed by a locking nail are penetrated in the outside of the body of a patient from a wire inlet hole 611 of a sleeve 610 of a medical wire cutting device and a wire through hole 222 of a guide part 210 and are penetrated out from a side hole 223 of the guide part 210 and a wire outlet hole 612 of the sleeve 600;

the second step is that: the distal end of the medical thread cutting device is conveyed to the right atrium of the heart through the femoral vein and the superior vena cava along the guidance of the medical thread, and moves close to the valve leaflet and the locking nail of the tricuspid valve until the distal end of the medical thread cutting device reaches a preset position;

the third step: the control button 711 on the handle 700 is pulled backwards, the fixed part 110 drives the blade 120 to move towards the near end along the axial direction, all medical wires are pressed on the tangent matching surface 221, then the medical wires are cut off, then the control button 711 is loosened, the control button 711 automatically resets under the action of the elastic force of the elastic part 770, and the fixed part 110 and the blade 120 automatically move towards the far end along the axial direction;

the fourth step: the medical thread cutting device and the redundant medical thread are withdrawn from the body of the patient, at the moment, the three groups of sutures respectively passing through the anterior leaflet, the posterior leaflet and the septal leaflet are fixed together by the locking nail reserved in the right atrium, and partial edges of the anterior leaflet, the posterior leaflet and the septal leaflet of the tricuspid valve are mutually involuted to finish the edge-to-edge repair.

Of course, the medical thread cutting device of the present embodiment may also be applied to cutting medical threads in mitral valve edge-to-edge repair surgery. The cutting device can also be applied to cutting of medical thread in valve chordae tendineae repair, the valve is not limited to a mitral valve and a tricuspid valve, and after the medical thread part serving as a prosthetic chordae tendineae is sutured on the valve and is partially anchored by an anchor on a ventricular wall or a papillary muscle, the medical thread is cut off in the heart by using the medical thread cutting device.

It is understood that the medical thread may also be a suture used solely to suture an incision or laceration, a suture used to be implanted in internal body tissue such as an annulus, etc., and the material of the medical thread includes, but is not limited to, PTFE, e-PTFE, PET, UHMWPE, etc. The medical thread cutting device of the present embodiment is suitable for cutting the aforementioned sutures for various applications.

Example two

Referring to fig. 12-16, the structure of the thread cutting assembly and the stopping member is changed in the medical thread cutting device according to the second embodiment of the present application compared to the medical thread cutting device according to the first embodiment of the present application.

In the second embodiment, the thread cutting assembly includes a fixing member 110 and a blade 120. The fixing member 110 has an inner cavity 111, the inner cavity 111 is not closed, but has a lower notch 112, and the lower notch 112 axially penetrates through the fixing member 110. The mating member includes a base portion 220 and a guide portion 210, the guide portion 210 extending axially from the base portion 220 toward a distal end. The fixing member 110 is axially slidably engaged with the guide portion 210. The guide portion 210 is provided with a wire passing hole 222 penetrating through a distal end surface of the guide portion 210 and a side hole 223 penetrating the wire passing hole 222.

An axially extending section 225 is also connected to the distal end of the base part 220, the axially extending section 225 overlying the guide part 210. The distal end of the base 220 is provided with a tangent matching surface 221 in a planar form, the tangent matching surface 221 is located between the axial extension section 225 and the guide portion 210, the bottom end of the tangent matching surface 221 is close to or flush with the central axis of the base 220, and the tangent matching surface 221 intersects with the outer peripheral surface of the base 220. The blade 120 is positioned between the axial extension section 225 and the guide part 210, and under the condition that the outer diameter of the far end of the base part 220 is the same, the width of the tangent line matching surface 221 is increased, the width of the cutting edge of the blade 120 can be correspondingly increased, and the tangent reliability can be further improved; under the condition that the number of the medical wires 800 to be cut off is the same, the outer diameter size of the distal end of the base part 220 can be reduced, and the delivery in a human body lumen is more facilitated.

It is understood that the form of the tangent matching surface 221 can be changed according to the shape of the cutting edge of the blade 120 on the basis of satisfying the matching of the tangent matching surface 221 with the cutting edge of the blade 120, such as: the blade of blade 120 can set up to the arc, and tangent line fitting surface 221 sets up to the cambered surface with blade 120's blade looks adaptation, guarantees that the blade of blade 120 can support completely to press on tangent line fitting surface 221 can.

The structure of the fixing element 110 in the second embodiment is flatter than that of the fixing element 110 in the first embodiment, the upper end of the fixing element 110 is attached to the lower end plane of the axial extension section 225, the lower end of the fixing element 110 is open and movably sleeved on the guide portion 210, and the guide portion 210 and the axial extension section 225 respectively limit the degrees of freedom of downward movement and upward movement of the fixing element 110.

Other structures of the wire cutting device in the second embodiment are the same as those in the first embodiment, and are not described herein again. In the second embodiment, the usage of the wire cutting device is the same as that in the first embodiment, and the description thereof is omitted.

Referring to fig. 17, 18 and 19, the shape of the cutting edge of the blade 120 in the first and second embodiments may be symmetrical, eccentric or single-sided, wherein the angle of the symmetrical cutting edge is θ₁The angle of the eccentric cutting edge is theta₂The angle of the cutting edge of the single-sided type is theta₃，θ₁、θ₂And theta₃Can range from 10 to 150 degrees, the smaller the angle of the cutting edge, the sharper the cutting edge of the blade 120. Preferably, the blade 120 has a symmetrical cutting edge, and the angle of the cutting edge is more preferably 30 °.

EXAMPLE III

Referring to fig. 20 to 22, compared to the medical thread cutting device of the third embodiment of the present application, the structure of the thread cutting assembly 100 and the stopping member 200 is changed.

In the third embodiment, the fitting 200 includes a guiding portion 210 and a base portion 220, the guiding portion 210 is generally cylindrical, the base portion 220 extends around the axial direction of the guiding portion 210 to cover a part of the outer peripheral surface of the guiding portion 210, and the tangential fitting surface 221 protrudes from the outer peripheral surface of the guiding portion 210 and extends along the axial direction of the guiding portion 210. The cutting line assembly 100 includes a fixing member 110 and a blade 120 fixedly connected to the fixing member 110, the fixing member 110 and the blade 120 are both disposed around the axial extension of the guiding portion 210, arc surfaces adapted to each other are disposed between the guiding portion 210 and the fixing member 110, the fixing member 110 is movably sleeved on the guiding portion 210, and the fixing member 110 is rotatably engaged with the guiding portion 210.

The fixing member 110 is provided with an arc-shaped notch 114 extending around the axis of the guide portion 210, and the stopper pin 630 is partially inserted into the guide portion 210, and another portion thereof radially protrudes from the arc-shaped notch 114 and is fixedly connected with the sleeve 610, thereby fixing the guide portion 210 and the sleeve 610. The guiding portion 210 is provided with a wire passing hole 222 penetrating through the distal end surface of the guiding portion 210 and a side hole 223 penetrating through the wire passing hole 222, the side hole 223 penetrates through the outer peripheral surface of the guiding portion 210, the medical wire 800 penetrates through the wire passing hole 222 and penetrates through the side hole 223, and the portion of the medical wire 800 penetrating through the side hole 223 is located between the cutting edge of the blade 120 and the tangent matching surface 221.

Referring to the first embodiment, it can be understood that in the third embodiment, the fixing member 100 can be controlled to rotate relative to the guiding portion 210 by the driving wire set, the flexible inner core and the manipulating member on the handle. Further, one driving wire set may be provided, the distal end of the driving wire set is connected to the fixing member 110, the proximal end of the driving wire set is connected to the flexible inner core, the flexible inner core is connected to the manipulating member on the handle, the flexible inner core is driven to rotate around the driving wire set by rotating the manipulating member, so as to drive the fixing member 100 and the blade 120 to rotate around the axial direction of the guiding portion 210 and towards the tangent matching surface 221, and the blade 120 presses the medical wire 800 against the tangent matching surface 221, thereby cutting off the medical wire 800. It can be understood that, in the third embodiment, an elastic member may be further disposed in the handle, and the elastic member is compressed between the operating member and the inner wall of the handle to reset the operating member, so that the blade 120 automatically leaves the tangent line matching surface 221 after the tangent line is completed.

Under the condition that the sleeve 610 has the same outer diameter, the rotationally-fitting structure of the tangent line assembly 100 and the fitting member 200 in the third embodiment is more beneficial to increasing the width of the tangent-fitting surface 221 and the width of the cutting edge of the blade 120, and more effectively improves the reliability of the tangent line. In addition, the driving mode of the blade 120 is set to be rotary, the torsional force is easier to transmit on the bent flexible inner core, the loss of the force is small, and the driving force required by the tangent line is smaller and more labor-saving.

In the third embodiment, the tangential matching surface 221 is preferably planar, but it can be understood that the form of the tangential matching surface 221 can be changed according to the shape of the edge of the blade 120 based on the matching requirement of the tangential matching surface 221 with the edge of the blade 120, such as: the cutting edge of the blade 120 can be set to be arc-shaped, and the tangent line fitting surface 221 is set to be arc-shaped matched with the cutting edge of the blade 120, so that the cutting edge of the blade 120 can be completely abutted against and pressed on the tangent line fitting surface 221.

It is to be understood that the foregoing examples, while indicating the preferred embodiments of the invention, are given by way of illustration and description, and are not to be construed as limiting the scope of the invention; it should be noted that, for those skilled in the art, the above technical features can be freely combined, and several changes and modifications can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention; therefore, all equivalent changes and modifications made within the scope of the claims of the present invention should be covered by the claims of the present invention.

Claims

1. A medical thread cutting apparatus, comprising:

the cutting line assembly comprises a fixing piece and a blade connected to the fixing piece; and

a mating member including a base and a guide;

2. The medical thread cutting device as claimed in claim 1, wherein the guiding portion has a thread passing hole passing through the distal end surface of the guiding portion and a side hole passing through the thread passing hole, the medical thread passes through the thread passing hole and passes out of the side hole, and the portion of the medical thread passing out of the side hole is located between the cutting edge and the thread cutting mating surface.

3. The medical thread cutting device of claim 2, wherein the cutting edge of the blade has a width a, the side hole has a width b, the number of strands of the medical thread is n, and the diameter of the medical thread is d;

wherein a is not less than b and b is not less than n × (π d/2).

4. The medical thread cutting device as claimed in claim 1, wherein the fixing member is provided with an inner cavity extending in the axial direction, and the guide portion is movably inserted into the inner cavity of the fixing member.

5. The medical wire cutting device of claim 1, wherein the wire cutting assembly further comprises at least one driving wire set, a distal end of the driving wire set is fixedly connected to the fixing member, and the driving wire set moves to drive the fixing member to move relative to the guide portion.

6. The medical thread cutting device of claim 5, wherein the thread mating surface is located proximal to the securing member, and wherein the drive wire set moves axially proximally to pull the securing member to move relative to the guide.

7. The medical wire cutting device of claim 6 wherein the base portion defines a guide slot along an axial direction, the drive wire set being in clearance fit with the guide slot to allow the drive wire set to slide axially along the guide slot.

8. The medical thread cutting device as claimed in claim 6, wherein there are two of said drive wire sets, and two of said drive wire sets are symmetrical with respect to an axial direction of said fixing member.

9. The medical thread cutting device as claimed in any one of claims 1 to 8, wherein the fixing member is axially slidably engaged with the guide portion, and at least one pair of mutually adapted guiding and sliding surfaces is provided between the guide portion and the fixing member.

10. The medical thread cutting device of claim 9 wherein the guide extends axially from a distal end of the base, the thread mating surface being disposed at the distal end of the base, the thread mating surface being a generally circular surface disposed about the guide.

11. The medical thread cutting device as claimed in claim 9, wherein the guide portion extends axially from a distal end of the base portion, the thread mating surface is disposed at the distal end of the base portion, a bottom end of the thread mating surface is flush with or close to a central axis of the base portion, and the thread mating surface intersects with an outer peripheral surface of the base portion.

12. The medical thread cutting device of claim 11 wherein an axially extending segment is further connected to the distal end of the base portion, the axially extending segment covering the guide portion, the thread cutting assembly being located between the axially extending segment and the guide portion.

13. The medical thread cutting device as claimed in any one of claims 1 to 5, wherein the fixing member is rotatably engaged with the guide portion about an axial direction of the guide portion, the base portion is provided to extend about the axial direction of the guide portion, and the thread cutting engagement surface protrudes from an outer peripheral surface of the guide portion and extends in the axial direction of the guide portion.

14. The medical thread cutting device of claim 1 further comprising a flexible inner core and an outer support tube assembly;

the far end of the flexible inner core is connected with the fixing piece, and the flexible inner core, the tangent line assembly and the matching and stopping piece are contained in the outer supporting pipe assembly.

15. The medical tangent device as recited in claim 14, wherein the outer support tube assembly comprises:

the wire cutting assembly and the matching and stopping piece are contained in the sleeve, and the matching and stopping piece is fixedly connected with the sleeve; and

the far end of the flexible outer pipe is fixedly connected with the near end of the sleeve, and the flexible inner core is movably arranged in the flexible outer pipe in a penetrating mode.

16. The medical thread cutting device of claim 15 further comprising a handle;

the proximal end of the flexible outer tube is fixedly connected to the distal end of the handle, the handle is provided with a control piece, and the control piece is connected with the proximal end of the flexible inner core so as to control the flexible inner core to move along the axial direction or rotate around the axial direction.

17. The medical thread cutting device as claimed in claim 16, wherein a resilient member is further provided within the handle, the resilient member being compressed between the control member and an inner wall of the handle to reposition the control member.