CN111481263A

CN111481263A - Medical instrument

Info

Publication number: CN111481263A
Application number: CN202010478045.5A
Authority: CN
Inventors: 许书菡; 汪振; 苗丹丹
Original assignee: Microport Urocare Shanghai Co Ltd
Current assignee: Microport Urocare Jiaxing Co Ltd
Priority date: 2020-05-29
Filing date: 2020-05-29
Publication date: 2020-08-04
Also published as: CN114795388A

Abstract

The invention relates to a medical instrument, which comprises a stone-taking basket, wherein the stone-taking basket is made of a pipe, the side wall of the pipe is provided with a plurality of partition grooves, and the partition grooves are arranged at intervals along the circumferential direction of the pipe so as to partition the side wall of the pipe into a plurality of basket claws; the dividing groove comprises a head section, a main body section and a tail section which are connected in sequence in a smooth transition mode along the direction from the proximal end to the distal end of the stone-taking basket; the width of the head section is gradually reduced along the direction far away from the main body section, and the proximal end of the head section is of an arc-shaped structure, and/or the width of the tail section is gradually reduced along the direction far away from the main body section, and the distal end of the tail section is of an arc-shaped structure; the width is a dimension of the dividing groove in a circumferential direction of the pipe. The stone-taking basket of the medical apparatus has the characteristics of high strength and small diameter.

Description

Medical instrument

Technical Field

The invention relates to the technical field of medical instruments.

Background

With the development of endoscope technology, especially endoscope technology, uretero-nephroscope has been widely used in the field of stone treatment, called transurethral uretero-nephroscope stone extraction technology. The general operation method is that a uretero-nephroscope is firstly led into a ureter to find calculus through a guide wire or a catheter sheath, then instruments such as a laser optical fiber, a calculus removing basket, an intercepting basket, a calculus removing balloon, a plugging catheter and the like are implanted into an instrument channel of an endoscope, and the aim of lithotripsy and calculus removing treatment is achieved through cooperation of different operations.

The stone-taking basket used in the prior art mostly comprises a stone-taking basket, the stone-taking basket comprises a plurality of basket claws, the near ends of the basket claws are connected with a traction part, the far ends of the basket claws are connected into a whole through a metal connecting piece, and therefore the diameter of the far end of the stone-taking basket is large, so that the outer diameter of a push pipe of the stone-taking basket is large, when the stone-taking basket is used together with a ureteroscope, the water injection amount of the ureteroscope is seriously influenced, the visual field of the ureteroscope is unclear, and the operation of a doctor is influenced. In addition, the existence of the metal connecting piece is not beneficial to bending and deviation of the ureteroscope in a human body, and when the calculus removing net basket is moved and rotated in the human body after being released, the metal connecting piece is easy to damage human body tissues.

Disclosure of Invention

The invention aims to provide a medical instrument which has little influence on the water injection amount of an endoscope when used together with the endoscope, improves the problem of blurred vision of the endoscope, and does not damage human tissues when moving and rotating in a human body.

In order to achieve the above object, the present invention provides a medical apparatus, comprising a stone-taking basket, wherein the stone-taking basket is made of a tube; the side wall of the pipe is provided with a plurality of dividing grooves which are arranged at intervals along the circumferential direction of the pipe so as to divide the side wall of the pipe into a plurality of basket claws;

the dividing groove comprises a head section, a main body section and a tail section which are connected in sequence in a smooth transition mode along the direction from the proximal end to the distal end of the stone-taking basket; the width of the head section is gradually reduced along the direction far away from the main body section, and the proximal end of the head section is of an arc-shaped structure, and/or the width of the tail section is gradually reduced along the direction far away from the main body section, and the distal end of the tail section is of an arc-shaped structure; the width is a dimension of the dividing groove in a circumferential direction of the pipe.

Optionally, the far end of the pipe is a closed end, and the end face of the closed end is a curved surface structure connected with the side wall of the pipe in a smooth transition manner.

Optionally, the stone-taking basket further comprises a traction part, the traction part is arranged at the proximal end of the stone-taking basket, and the traction part and the stone-taking basket are integrally formed.

Optionally, the dividing groove is formed on the tube by means of laser cutting, mechanical cutting or chemical etching.

Optionally, the dividing groove is formed by laser cutting, the minimum slit width of the laser cutting is 10um, the positioning accuracy of the pipe on the X axis is ± 1um, the positioning accuracy on the theta axis is ± 15arcsec, and the positioning accuracy on the Z axis is ± 3 um.

Optionally, the stone-taking basket further comprises a handle, the handle is connected with the stone-taking basket, and the handle is used for controlling the release and recovery of the stone-taking basket and driving the stone-taking basket to rotate when the stone-taking basket is released.

Optionally, the stone-taking basket further comprises a handle, the handle is connected with the proximal end of the traction part and is used for controlling the release and recovery of the stone-taking basket and driving the stone-taking basket to rotate when the stone-taking basket is released.

Optionally, the medical apparatus further comprises a traction portion disposed at a proximal end of the stone extraction basket; the handle comprises a shell, a rotating shaft, a loading mechanism and a pushing mechanism; wherein the content of the first and second substances,

at least one part of the rotating shaft is arranged in the shell, and the proximal end of the rotating shaft is connected with the proximal end of the traction part so as to drive the stone-taking basket to rotate;

the loading mechanism part is arranged in the shell and used for loading the stone-taking basket, and the loading mechanism can move relative to the shell;

the pushing mechanism is arranged on the shell and connected with the loading mechanism and used for driving the loading mechanism to do reciprocating linear motion along the axial direction of the shell so as to enable the loading mechanism and the stone-taking basket to move relatively to realize the recovery and the release of the stone-taking basket.

Optionally, the loading mechanism is located at a distal end of the rotating shaft, and a proximal end of the loading mechanism is capable of extending into the rotating shaft.

Optionally, the rotating shaft, the loading mechanism and the pushing mechanism are all arranged in the middle of the shell.

Alternatively, a part of the rotating shaft is disposed inside the housing, and another part is exposed to the outside of the housing.

Optionally, the loading mechanism comprises a rack and a core tube, the rack is movably disposed inside the housing, and a proximal end of the rack extends into the rotating shaft; the core tube is used for loading the stone-taking basket, the near end of the core tube is connected with the rack, and the far end of the core tube extends out of the shell from the far end of the shell;

the pushing mechanism comprises a gear and an operating part, and the gear is arranged inside the shell; the operating part is arranged outside the shell and is connected with the gear;

the gear is meshed with the rack to drive the rack to do reciprocating linear motion along the axial direction of the shell, and further drive the core pipe to do reciprocating linear motion along the axial direction of the shell to achieve recovery and release of the stone-taking basket.

Optionally, the handle further comprises a protective sleeve disposed coaxially with the rotation axis; the near end of the protective sleeve extends into the rotating shaft and is connected with the rotating shaft; the proximal end of the traction part passes through the protective sleeve and is connected with the rotating shaft.

Optionally, the proximal end of the core tube is disposed within the protective sleeve.

Optionally, a fixing head is arranged at the proximal end of the rotating shaft, and a mounting hole is formed in the fixing head; the fixing head is matched with the near end of the protective sleeve through the mounting hole.

Optionally, the housing has a first lumen, and a distal end of the first lumen communicates with an exterior of the housing; the rotating shaft is provided with a second inner cavity extending along the axial direction, and the distal end of the second inner cavity is communicated with the first inner cavity; the core tube is provided with a third inner cavity which is axially communicated; the protective sleeve is provided with a fourth inner cavity which is axially communicated;

a portion of the rotating shaft, the loading mechanism and the pushing mechanism are all disposed in the first inner cavity; the fourth inner cavity, the third inner cavity and the second inner cavity are communicated in sequence; the first inner cavity, the second inner cavity, the third inner cavity and the fourth inner cavity are coaxially arranged and extend along the axial direction of the shell.

Optionally, the rack has a fifth internal cavity extending through the housing in an axial direction; the proximal end of the core tube penetrates through the fifth inner cavity and extends out of the rack from the distal end of the fifth inner cavity, and the tube wall of the core tube is connected with the wall of the proximal end cavity of the fifth inner cavity.

Optionally, the handle further comprises a guide tube, the guide tube being a tapered structure that tapers in cross-section in a proximal-to-distal direction; the guide tube is arranged outside the shell and is connected with the far end of the shell; the distal end of the core tube extends through the guide tube and out of the distal end of the guide tube.

Optionally, a guide nozzle is further included, the guide nozzle being connected to the distal end of the guide tube.

Optionally, the housing comprises two cooperating sub-housings.

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

firstly, the medical apparatus comprises a stone-taking basket which is made of a pipe, a plurality of dividing grooves are arranged on the side wall of the pipe, and the dividing grooves are arranged at intervals along the circumferential direction of the pipe so as to divide the side wall of the pipe into a plurality of basket claws; the dividing groove comprises a head section, a main body section and a tail section which are connected in sequence in a smooth transition mode along the direction from the near end to the far end of the stone-taking net basket, the width of the head section is gradually reduced along the direction far away from the main body section, the near end of the head section is of an arc-shaped structure, and/or the width of the tail section is gradually reduced along the direction far away from the main body section, and the far end of the tail section is of an arc-shaped structure; the width is a dimension of the dividing groove in a circumferential direction of the pipe body. The stone-taking basket is formed by arranging the partition groove on the pipe, and the metal connecting piece is not required to be additionally arranged to connect the basket claws, so that the radial size of the stone-taking basket is reduced, the outer diameter of a core pipe for accommodating the stone-taking basket is reduced, when the medical instrument is used together with an endoscope, the outer diameters of the stone-taking basket and the core pipe are smaller, the influence on the water injection amount of the endoscope can be reduced, the visual field definition of the endoscope is improved, and the operation of a doctor is facilitated; on the other hand, the movement and the deviation of the endoscope in the human body are prevented from being hindered. Meanwhile, the shapes of the head section and the tail section of the dividing groove are designed, so that the stress of the stone-taking basket at the two ends of the dividing groove is reduced, the overall strength of the stone-taking basket is improved, and the service life of the stone-taking basket is prolonged.

And secondly, the far end of the pipe is a closed end, and the end surface of the closed end is a curved surface structure connected with the side wall of the pipe in a smooth transition manner, so that the stone-taking basket is prevented from losing human tissues when moving or rotating in a human body.

Drawings

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

FIG. 2a is a schematic structural view of a stone extraction basket and a traction portion of a medical device according to an embodiment of the present invention, wherein the stone extraction basket is closed;

FIG. 2b is a schematic view of a stone-extraction basket and a traction portion of a medical device according to an embodiment of the present invention, wherein the stone-extraction basket is open;

FIG. 3 is a schematic structural view of a handle of a medical device provided in accordance with an embodiment of the present invention;

FIG. 4 is an exploded view of a handle of a medical device according to one embodiment of the present invention, without a protective sleeve and a core tube;

FIG. 5 is a cross-sectional view of a handle of a medical device provided in accordance with an embodiment of the present invention;

FIG. 6 is an enlarged, fragmentary schematic view of the handle of the medical device shown in FIG. 5;

fig. 7 is a schematic view of the protective sleeve, rotational axis and distraction portion of a medical device according to an embodiment of the invention;

FIG. 8 is a schematic structural diagram of a loading mechanism for a medical device provided in accordance with an embodiment of the present invention;

FIG. 9 is a schematic view of a guide nozzle of a stone extraction basket system according to an embodiment of the present invention;

FIG. 10 is a schematic view of a handle of a medical device provided in accordance with an embodiment of the present invention engaged with a nozzle.

[ reference numerals are described below ]:

10-a medical device;

100-stone-taking basket;

110-a dividing groove;

111-head section, 112-body section, 113-tail section;

120-basket claw;

200-a traction portion;

300-a handle;

310-a housing;

311-partial shell;

320-a loading mechanism;

321-rack, 322-core tube;

330-a pushing mechanism;

331-gear, 332-operating part;

340-a rotation axis;

350-a protective sleeve;

360-a guide tube;

400-guide mouth.

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.

The terms "proximal" and "distal" herein refer to the relative orientation, relative position, and direction of elements or actions with respect to one another from the perspective of a physician using the medical device, although "proximal" and "distal" are not intended to be limiting, but "proximal" generally refers to the end of the medical device that is closer to the physician during normal operation, and "distal" generally refers to the end that is closer to or enters the patient first.

It is an object of the present invention to provide a medical device for use in transurethral ureteroscopic stone extraction techniques, i.e. for use in conjunction with an endoscope, such as a ureteroscope, for lithotripsy stone extraction.

Specifically, the medical instrument comprises a calculus removal basket which is manufactured from a tube. The side wall of the pipe is provided with a plurality of dividing grooves which are arranged at intervals along the circumferential direction of the pipe so as to divide the side wall of the pipe into a plurality of basket claws. Namely, a part of materials are removed from the side wall of the pipe to form a plurality of integrally formed basket claws, and no additional metal connecting piece is needed, so that the diameter of the stone taking basket can be reduced on the one hand, the stone taking basket can be accommodated in a core pipe with a smaller diameter, and then the stone taking basket is used together with the ureteroscope, the influence of the core pipe on the injection amount of the ureteroscope is reduced as much as possible, the visual field definition of the ureteroscope is improved, and the operation of a doctor is facilitated. On the other hand, the obstruction of the ureteroscope in the movement of a human body and the cheapness caused by the calculus removing basket can be reduced. Further, along the direction from the proximal end to the distal end of the stone basket net, the dividing groove comprises a head section, a main body section and a tail section which are connected in sequence in a smooth transition mode, the width of the head section is gradually reduced along the direction far away from the main body section, and the proximal end of the head section is of an arc-shaped structure. The shape of the tail section may be similar to that of the head section, i.e. the width of the tail section gradually decreases in a direction away from the main body section, and the distal end of the tail section is an arc-shaped structure. The shape of the head section and the tail section of the dividing groove is designed to be a structure similar to a triangle, so that the stress of the stone-taking basket at two ends of the dividing groove is reduced, and the overall strength of the stone-taking basket is improved.

In order to further reduce the damage to human tissues when the stone-taking basket is used for breaking and taking stones, the invention preferably selects the far end of the pipe as a closed end, and the end surface of the closed end is a curved surface structure which is smoothly and transitionally connected with the side wall of the pipe.

Still further, the medical apparatus provided by the invention further comprises a handle, wherein the handle is connected with the calculus removing basket, is used for controlling the recovery or release of the calculus removing basket, and drives the calculus removing basket to rotate when the calculus removing basket is released, so that the medical apparatus is convenient to use.

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 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.

Referring to fig. 1, 2a and 2b, the medical device includes a stone-taking basket 100, and the stone-taking basket 100 is made of a tube. A plurality of (two or more) dividing grooves 110 are provided on the side wall of the pipe, and the plurality of dividing grooves 110 are arranged at intervals in the circumferential direction of the pipe to divide the side wall of the pipe into a plurality of basket claws 120. In this embodiment, the dividing grooves 110 are formed by removing a part of material on the side wall of the tube, so that the side wall between two adjacent dividing grooves 110 constitutes the basket claw 120. That is, compared to the prior art, the basket claws 120 are integrally formed without an additional metal connecting member for connecting the basket claws 120, so that the diameter of the stone basket 100 is reduced, and the stone basket can be accommodated in a core tube having a smaller size. Thus, when the medical device 10 is used in combination with a ureteroscope, the volume occupied by the core tube in the device cavity of the ureteroscope is small, the influence on the water injection amount of the ureteroscope is reduced, and the visual field definition of the ureteroscope is improved.

In this embodiment, the tube may be made of a shape memory alloy, such as nitinol, and after the cutting grooves 110 are formed on the tube, a force is applied to the tube to move the basket claws 120 away from each other to form a cage-shaped structure, and finally, the basket 100 is heated and set. Thus, when the stone basket 100 is accommodated in the core tube, the stone basket 100 is closed by the pressing of the inner wall of the core tube, and when the stone basket 100 is protruded out of the core tube, the stone basket 100 is expanded to be opened by the super elasticity.

With continued reference to fig. 2a, the length of the dividing groove 110 extends along the axial direction of the pipe, and in the proximal to distal direction of the stone extraction basket 100, the dividing groove 110 comprises a head section 111, a main body section 112 and a tail section 113 which are connected in sequence in a smooth transition manner. Wherein the width of the head section 111 gradually decreases in a direction away from the main body section 112, and the proximal end of the head section 111 has an arc-shaped structure. Similarly, the width of the tail segment 113 decreases in a direction away from the main segment 112, and the distal end of the tail segment 113 has an arc-shaped configuration. By designing the head section 111 and the tail section 113 to be of a triangle-like structure with gradually changing widths, the stress of the stone-taking basket 100 at the two ends of the dividing groove 110 is reduced, and the overall strength of the stone-taking basket 100 is improved. Further, it is preferable that the profiles of the head section 111 and the tail section 113 are formed by connecting a plurality of curved lines. It should be noted that the width refers to the size of the dividing groove 110 in the circumferential direction of the pipe, and here the shape of the dividing groove 110 refers to the shape of the dividing groove 110 in the closed state of the stone basket 100. In addition, the shape of the main body segment 112 of the dividing groove 110 is not limited in this embodiment as long as it is smoothly transitionally connected with the head segment 111 and the tail segment 113, and in the embodiment shown in fig. 2a, the main body segment 112 is a long strip with a uniform width.

Optionally, in this embodiment, any suitable method such as laser cutting, mechanical cutting or chemical etching is used to remove a part of the material on the tube to form the dividing groove 110. The dividing groove 110 is preferably formed by laser cutting, which has the advantages of high precision, high efficiency and convenient operation, and is suitable for cutting and forming the dividing groove 110 with extremely small size, especially the cutting of the head section 111 and the tail section 113 with smaller size.

When the dividing groove 110 is formed by a laser cutting method, the minimum slit width which can be cut by laser is 10um, the pipe is mounted on a laser cutter, and the positioning accuracy of the pipe on the X axis is +/-1 um, the positioning accuracy of the pipe on the theta axis is +/-15 arcsec, and the positioning accuracy of the pipe on the Z axis is +/-3 um.

Preferably, with continued reference to fig. 2a and 2b, the distal end of the tube is a closed end, and the end surface of the closed end is a curved structure, preferably a spherical structure, smoothly transitionally connected with the side wall of the tube. That is, the distal end of the calculus removing basket 100 is rounded to prevent the calculus removing basket 100 from damaging human tissues.

Further, the medical device 10 further comprises a traction part 200, wherein the traction part 200 is connected with the proximal end of the calculus removing basket 100. The material of the traction portion 200 may be the same as that of the stone-taking basket 100, in some embodiments, the traction portion 200 and the stone-taking basket 100 are integrally formed, for example, the traction portion 200 and the stone-taking basket 100 are made of the same pipe, that is, the cutting groove 110 is disposed on the far-end side wall of the pipe to form the stone-taking basket 100, and the near end of the pipe constitutes the traction portion 200. In other embodiments, the pulling portion 200 may be formed separately from the stone basket 100 and then connected thereto by any other suitable means.

Further, referring back to fig. 1 in combination with fig. 3, the medical device 10 further includes a handle 300, wherein the handle 300 is connected to a proximal end of the calculus removing basket 100, specifically, to a proximal end of the traction portion 200, that is, the handle 300 is connected to the calculus removing basket 100 through the traction portion. The handle 300 is used to control the release or retrieval of the stone basket 100. Further, the handle 300 may also be used to drive the rotation of the stone basket 100 when the stone basket 100 is released, to optimize the stone extraction effect and improve the stone extraction efficiency.

Referring to fig. 3 to 8, the handle 300 includes a housing 310, a loading mechanism 320, a pushing mechanism 330, and a rotating shaft 340. Wherein the loading mechanism 320 is partially disposed inside the housing 310, the loading mechanism 320 is used for loading the stone-taking basket 100, and the loading mechanism 320 can move relative to the housing 310. A portion of the pushing mechanism 330 is disposed inside the housing 310, and another portion is disposed outside the housing 310. The pushing mechanism 330 is used for connecting with the loading mechanism 320, and is used for driving the loading mechanism 320 to make a reciprocating linear motion along the axial direction of the housing 310. The rotation shaft 340 is disposed on the housing 310 and is rotatable with respect to the housing 310.

The rotating shaft 340 is connected to the proximal end of the traction portion 200, and is configured to drive the traction portion 200 to rotate, so as to drive the calculus removing basket 100 to rotate. The loading mechanism 320 is used for loading the stone-taking basket 100 and the far end of the traction part 200, and when the pushing mechanism 330 drives the loading mechanism 320 to make reciprocating linear motion along the axial direction of the shell 310, the loading mechanism 320 can move relative to the stone-taking basket 100 to achieve the purpose of releasing or recovering the stone-taking basket 100. That is, when the loading mechanism 320 moves towards the distal end of the housing 310, the loading mechanism 320 receives the stone extraction basket 100 such that the stone extraction basket 100 is in a closed state; when the loading mechanism 320 is moved towards the proximal end of the housing 310, the stone basket 100 is extended from the loading mechanism 320 and opened. That is, the doctor can control the posture of the calculus removing basket 100 by manipulating the rotating shaft 340 of the handle 300 and the pushing mechanism 330.

In an exemplary embodiment, as shown in fig. 3, the pushing mechanism 330 and the rotating shaft 340 are both located in the middle of the housing 310, and the rotating shaft 340 is disposed at the distal end of the pushing mechanism 330, while preferably a portion of the rotating shaft 340 is located in the housing 310, and another portion of the rotating shaft 340 is exposed outside the housing 310, for example, by opening a window on the housing 310 to expose the rotating shaft to the outside of the housing 310, which is provided for the purpose of facilitating the single-handed operation of the handle 300 by the doctor for convenient use. It is understood that the "middle" refers to the area between the distal end and the proximal end of the housing 310, which may be 1/2 of the axial dimension of the housing 310, or may be offset from 1/2 of the axial dimension of the housing 310 to be closer to the distal end or the proximal end of the housing 310, and the present invention is not limited thereto.

In detail, with continued reference to fig. 3 to 8, the middle portion of the housing 310 has a first inner cavity, and a distal end of the first inner cavity is communicated with the outside of the housing 310. A portion of the loading mechanism 320 is disposed in the first interior cavity and another portion is disposed outside of the housing 310. A portion of the pushing mechanism 330 is disposed in the first interior cavity and another portion is disposed outside of the housing 310.

Further, the proximal end of the loading mechanism 320 may extend into the rotating shaft 340 to increase the stroke of the loading mechanism 320 to ensure that the stone extraction basket 100 is fully retrieved or released. In this embodiment, the rotating shaft 340 has a second lumen 341 extending in the axial direction, and a distal end of the second lumen 341 is formed to be open so that the second lumen 341 communicates with the first lumen. The loading mechanism 320 has a third lumen. The third inner chamber is also communicated with the second inner chamber, and preferably, the first inner chamber, the second inner chamber 341, and the third inner chamber are coaxially disposed and all extend in the axial direction of the housing 310. The distal ends of the stone-taking basket 100 and the traction part 200 are used for loading in the third inner cavity, and the proximal end of the traction part 200 extends out of the proximal end of the third inner cavity and is connected with the rotating shaft 340.

Further, as shown in fig. 5 to 7, the handle 300 further includes a protective sleeve 350 coaxially disposed with the rotation shaft 340. The protection sleeve 350 extends in the axial direction of the housing 310, and the proximal end of the protection sleeve 350 extends into the rotation shaft 340 and is connected to the proximal end of the rotation shaft 340. The protection sleeve 350 allows the proximal end of the traction portion 200 to pass therethrough to be coupled with the rotation shaft 340. Specifically, the protection sleeve 350 has a fourth inner cavity penetrating axially, and the proximal end of the traction portion 200 extends into the fourth inner cavity after protruding from the third inner cavity, and is connected to the rotation shaft 340. When the rotation shaft 240 rotates, the protection sleeve 350 and the traction portion 200 rotate in synchronization, and the traction portion 200 is prevented from being twisted or kinked under the restriction of the inner wall of the protection sleeve 350.

Further, a fixed head 342 is disposed on the proximal end of the rotating shaft 340, and a mounting hole communicated with the third inner cavity 341 is disposed on the fixed head 342. The proximal end of the protection sleeve 350 extends into the mounting hole and is connected to the wall of the mounting hole by welding, gluing or any other suitable means. On one hand, the connection mode increases the connection area of the protection sleeve 350 and the rotating shaft 340, and improves the connection reliability. On the other hand, the axial length of the second lumen 341 is also increased to maximize the stroke of the loading mechanism 320.

Optionally, the loading mechanism 320 includes a rack 321 and a core tube 322. The length direction of the rack 321 extends along the axial direction of the housing 310, the rack 321 is movably disposed in the first inner cavity, and the proximal end of the rack 321 can extend into the second inner cavity 341 of the rotating shaft 340. The core tube 322 extends along the axial direction of the housing 310 in the longitudinal direction, the proximal end of the core tube 322 is disposed in the first inner cavity and connected to the rack 321, and the distal end of the core tube 322 extends out of the housing 310 from the distal end of the first inner cavity. The core tube 322 has the third inner cavity, i.e., the stone basket 100 is adapted to be received in the core tube 322. The pushing mechanism 330 includes a gear 331 and an operating portion 332, the gear 331 is disposed in the first inner cavity and engaged with the rack 321, the operating portion 332 is disposed outside the casing 310 and connected to the gear 331, and the operating portion 332 is preferably a roller for driving the gear 331 to rotate so as to drive the rack 321 to make a reciprocating linear motion along the axial direction of the casing 310, and then driving the core tube 322 to make a reciprocating linear motion along the axial direction of the casing 310 so as to release or recover the calculus removing net basket 100. The gear 331 and the rack 321 are matched for transmission, so that the transmission stability is improved. It should be understood that, in other alternative embodiments, the pushing mechanism may also directly drive the loading mechanism to perform an axial reciprocating linear motion along the housing in a push-pull manner, in this case, the loading mechanism may only include the core tube, and the pushing mechanism may be a sliding block disposed on the housing, and the sliding block is connected to the core tube.

Preferably, the proximal end of the core tube 322 is always disposed in the protection sleeve 350 during the reciprocating movement of the core tube 322 in the axial direction of the housing 310. This has the advantage of preventing the pulling part 200 from kinking or kinking under the influence of friction forces when the core pipe 322 is moved relative to the rock basket 100.

Further, the rack 321 has a fifth inner cavity extending through the housing 310 in the axial direction, and the core tube 322 is connected to the wall of the fifth inner cavity and communicates the third inner cavity with the fifth inner cavity, preferably, the third inner cavity is coaxial with the fifth inner cavity. Further, the core tube 322 is connected to the distal cavity wall of the fifth inner cavity, and the proximal end of the core tube 322 extends from the distal end of the fifth inner cavity to the rack 321, so that the proximal end of the core tube 322 is always located in the fourth inner cavity of the protection sleeve 350.

The medical device is described above by taking the handle 300 as an example to drive the calculus removing basket 100 to rotate, but it should be understood by those skilled in the art that in some embodiments, the handle 300 does not have a function of driving the calculus removing basket 100 to rotate, and when the handle 300 does not need to drive the calculus removing basket 100 to rotate, the rotating shaft 340 can be omitted, and the proximal end of the traction part 200 can be directly connected with the housing 310. In addition, in this embodiment, it is preferable that the housing 310 includes two sub-housings 311 that are engaged with each other, and the housing 310 is a split structure, so as to facilitate assembly of the entire medical apparatus 300.

Further, referring back to fig. 3 and 5, the handle further includes a hollow guide tube 360, and the guide tube 360 is a tapered structure with a cross section tapering in a proximal-to-distal direction. The guide tube 360 is disposed outside the housing 310, and a proximal end of the guide tube 360 is connected to a distal end of the housing 310. The distal end of the core tube 322 extends through the guide tube 360 and out the distal end of the guide tube 360.

In addition, as shown in fig. 9 and 10, the medical device 10 may further include a hollow guiding nozzle 400, a proximal end of the guiding nozzle 400 is connected to a distal end of the handle 300, and the guiding nozzle 400 may facilitate the calculus removing basket 100 to pass through the device channel of the ureteroscope. The guide nozzle 400 is a conventional guide nozzle, and the structure thereof will not be described in detail.

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

1. A medical apparatus, comprising a stone-taking basket, wherein the stone-taking basket is manufactured from a tube; the side wall of the pipe is provided with a plurality of dividing grooves which are arranged at intervals along the circumferential direction of the pipe so as to divide the side wall of the pipe into a plurality of basket claws;

2. The medical device of claim 1, wherein the distal end of the tubing is a closed end, and the end face of the closed end is a curved structure that smoothly transitions into connection with the side wall of the tubing.

3. The medical device of claim 1, further comprising a traction portion disposed at a proximal end of the stone extraction basket, the traction portion being integrally formed with the stone extraction basket.

4. The medical instrument of claim 1, wherein the dividing groove is formed in the tubing by laser cutting, mechanical cutting, or chemical etching.

5. The medical instrument according to claim 4, wherein the dividing groove is formed by laser cutting, the minimum slit width of the laser cutting is 10um, the positioning accuracy of the tube material on the X axis is +/-1 um, the positioning accuracy on the theta axis is +/-15 arcsec, and the positioning accuracy on the Z axis is +/-3 um.

6. The medical device of claim 1, further comprising a handle connected to the stone-extraction basket, the handle configured to control release and retraction of the stone-extraction basket and to drive rotation of the stone-extraction basket upon release of the stone-extraction basket.

7. The medical device of claim 3, further comprising a handle connected to a proximal end of the traction portion, the handle configured to control release and retraction of the stone extraction basket and to drive rotation of the stone extraction basket upon release of the stone extraction basket.

8. The medical device of claim 6 or 7, further comprising a traction portion disposed at a proximal end of the stone extraction basket; the handle comprises a shell, a rotating shaft, a loading mechanism and a pushing mechanism; wherein the content of the first and second substances,

9. The medical device of claim 8, wherein the loading mechanism is located at a distal end of the rotating shaft and a proximal end of the loading mechanism is extendable into the rotating shaft.

10. The medical device of claim 9, wherein the rotating shaft, the loading mechanism, and the pushing mechanism are all disposed in a middle portion of the housing.

11. The medical instrument of claim 8, wherein a portion of the rotating shaft is disposed inside the housing and another portion is exposed outside the housing.

12. The medical device of claim 8, wherein the loading mechanism includes a rack and a core tube, the rack being movably disposed within the housing, and a proximal end of the rack extending into the rotational axis; the core tube is used for loading the stone-taking basket, the near end of the core tube is connected with the rack, and the far end of the core tube extends out of the shell from the far end of the shell;

13. The medical device of claim 12, wherein the handle further comprises a protective sleeve disposed coaxially with the rotational axis; the near end of the protective sleeve extends into the rotating shaft and is connected with the rotating shaft; the proximal end of the traction part passes through the protective sleeve and is connected with the rotating shaft.

14. The medical device of claim 13, wherein a proximal end of the core tube is disposed within the protective sleeve.

15. The medical instrument of claim 13, wherein the proximal end of the rotating shaft is provided with a fixed head, and the fixed head is provided with a mounting hole; the fixing head is matched with the near end of the protective sleeve through the mounting hole.

16. The medical device of claim 15, wherein the housing has a first lumen, and a distal end of the first lumen is in communication with an exterior of the housing; the rotating shaft is provided with a second inner cavity extending along the axial direction, and the distal end of the second inner cavity is communicated with the first inner cavity; the core tube is provided with a third inner cavity which is axially communicated; the protective sleeve is provided with a fourth inner cavity which is axially communicated;

17. The medical instrument of claim 16, wherein the rack has a fifth lumen extending through an axial direction of the housing; the proximal end of the core tube penetrates through the fifth inner cavity and extends out of the rack from the distal end of the fifth inner cavity, and the tube wall of the core tube is connected with the wall of the proximal end cavity of the fifth inner cavity.

18. The medical device of claim 12, wherein the handle further comprises a guide tube having a tapered configuration that tapers in cross-section in a proximal-to-distal direction; the guide tube is arranged outside the shell and is connected with the far end of the shell; the distal end of the core tube extends through the guide tube and out of the distal end of the guide tube.

19. The medical device of claim 18, further comprising a guide tip coupled to a distal end of the guide tube.

20. The medical device of claim 8, wherein the housing comprises two interfitting sub-housings.