CN210962086U - Puncture needle - Google Patents

Abstract

The utility model provides a puncture needle, which relates to the technical field of medical equipment and mainly aims to provide a puncture needle with more abundant functions. The puncture needle comprises an outer sheath, a needle and a handle, wherein the handle comprises a near-side section, a middle section and a far-side section, the near-side section is provided with a near-side cavity with two open ends along the length direction, the near-side part of the middle section is inserted into the near-side cavity of the near-side section, the middle section is provided with a middle cavity with two open ends along the length direction, the far-side section is provided with a far-side cavity with two open ends along the length direction, and the far-side section and the; wherein a first limiting mechanism is arranged at the intersection of the proximal section and the middle section, and a second limiting mechanism is arranged at the intersection of the middle section and the distal section; the free end of the sheath is provided with a through hole for the free end of the needle to pass through, and the other end of the needle is fixedly arranged at the free end of the near side section; the free end of the proximal section or the periphery of the needle is also provided with a channel which is communicated with the needle. The utility model is used for provide a puncture needle that function is abundanter.

Description

Puncture needle

Technical Field

The utility model belongs to the technical field of medical equipment technique and specifically relates to a pjncture needle that can carry out puncture operation is related to.

Background

Fine Needle Aspiration (FNA), also known as fine needle biopsy, is a technique commonly used to detect the presence of nodules in a patient by inserting a fine needle into the lesion and aspirating a portion of the diseased cells from the lesion. The physician determines the patient's condition by further observation or pathology examination of the cell tissue aspirated by the needle to select an appropriate treatment regimen. The detection means is generally used in the diagnosis and treatment process of various diseases of the chest and abdomen, such as judging whether a pancreatic nodule is malignant tumor or benign or suspicious; in addition, puncture needles are also often used to place a guide wire into a lesion or organ for further intervention, such as puncturing an abscess, placing the guide wire into the abscess, and then guiding the stent with the guide wire for drainage of the abscess.

At present, the ordinary pjncture needle that the puncture adopted, if need place other operations such as support in sick position, on the one hand need place the guide wire, also need the negative pressure suction to judge the position of needle sometimes (for example the purulence has been drawn back and the pjncture needle point can be confirmed in the abscess), ordinary needle only has an inserted hole, like this need be fixed a position simultaneously and place two actions (negative pressure suction and place the guide wire) of support to sick position, need go on respectively, increased operating time, the patient's that also prolongs simultaneously misery.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a puncture needle to solve the technical problem that the puncture needle function that exists among the prior art is single.

In order to achieve the above purpose, the utility model provides a following technical scheme:

the utility model provides a puncture needle, which comprises an outer sheath, a needle and a handle, wherein the handle comprises a proximal section, a middle section and a distal section,

the proximal section is provided with a proximal cavity with two open ends along the length direction, and the size and the shape of the proximal cavity are designed to accommodate an endoscopic medical device therein;

the two ends of the middle section penetrate through the middle section to form a middle cavity in the middle of the middle section, and the proximal part of the middle section is inserted into the proximal cavity of the proximal section so that the middle cavity is communicated with the proximal cavity;

the far-side section is provided with a far-side cavity penetrating through openings at two ends along the axis direction, the far-side cavity is communicated with the middle cavity, and the far-side section is sleeved with the middle section;

wherein the intersection of the proximal section and the intermediate section is provided with a first limiting mechanism for limiting the advancement and retraction of the needle inserted into the intermediate cavity and the distal cavity along the axis of the proximal cavity, and the intersection of the intermediate section and the distal section is provided with a second limiting mechanism for limiting the advancement and retraction of the outer sheath attached to the intermediate cavity;

the outer sheath is of a hollow structure, one end of the outer sheath is fixedly arranged at the near side part of the middle cavity, and the other end of the outer sheath is arranged along the length direction of the middle cavity towards the direction of the far side section; the free end of the sheath is provided with a through hole for the free end of the needle to pass through, and the other end of the needle is fixedly arranged at the free end of the proximal section;

a channel is further arranged at the free end of the proximal section or the periphery of the needle, and the channel is communicated with the needle.

The puncture needle at the near side section can be simultaneously connected with the needle and the guide wire when in use by arranging the channel at the free end of the near side section or the periphery side of the needle, so that the negative pressure puncture and the guide wire positioning can be simultaneously carried out; in addition, the handle consists of three mutually sleeved parts, namely a proximal section, a middle section and a distal section, the outer sheath is fixedly arranged in a second limiting mechanism, and the second limiting mechanism can adjust the length of the distal section inserted into the middle cavity, so that the length of the distal section inserted into the middle cavity can be adjusted through the second limiting mechanism, and meanwhile, the length of the outer sheath can also be adjusted through the second limiting mechanism; the needle is inserted into the sheath, and the length of the handle is adjusted by adjusting the length of the intermediate section inserted into the proximal section by adjusting the first limiting mechanism when the length of the sheath is constant.

In the above technical solution, preferably, a sealing member is disposed at the passage, and the sealing member is used for closing the passage.

When only one needle is inserted into the handle and the channel is not used, the channel can be closed by the sealing element, so that the body fluid is prevented from entering the outer sheath through the channel and polluting the needle; and simultaneously can maintain the negative pressure environment in the sheath.

In the above technical solution, preferably, the sealing member is a cap-shaped structure, the sealing member includes a sealing head and a hand-held portion that are fixedly connected, and a cross section of the sealing head is the same as a cross section of the passage.

Since the cross-section of the sealing head is the same as the cross-section of the channel, the channel can be completely sealed when the seal is inserted into the channel.

In the above technical solution, preferably, the sealing member is a cap-shaped structure, the sealing member includes a sealing head and a hand-held portion that are fixedly connected, and the sealing head is connected with the channel in an interference fit manner.

In the above technical solution, preferably, the sealing member is a rotating fastening device.

In the above technical solution, preferably, the outer side of the passage extends outward to form a branch pipe, the outer side of the branch pipe is provided with an external thread, and the corresponding position of the rotary fastening device is provided with an internal thread matching with the external thread.

The branch pipe and the rotary fastening device are fixedly connected through threads, so that the channel is closed.

In the above technical solution, preferably, a rubber pad is disposed at an end of the inner side of the rotating fastening device.

The rubber pad is arranged in the rotary fastening device, and when the rotary fastening device is in threaded connection with the branch pipe, the rubber pad is extruded under pressure, so that the channel can be better sealed, and the device is ensured to be airtight after being screwed down.

In the above technical solution, preferably, an included angle between an axis of the channel and an axis of the proximal section is smaller than 90 degrees.

The included angle is less than 90 degrees to facilitate passage of the guidewire through the passageway.

In the above technical solution, preferably, the first limiting mechanism includes a first limiting ring and a first adjusting device located outside the first limiting ring, and the first adjusting device adjusts the friction force between the inner periphery of the proximal section and the outer periphery of the middle section by adjusting the inner diameter of the limiting ring.

The first adjusting device adjusts the inner diameter of the first limiting ring, when the inner diameter of the first limiting ring is smaller, the pressure of the first limiting ring on the proximal section is larger, the proximal section shrinks inwards under the pressure of the first limiting ring so as to enhance the friction force between the proximal section and the middle section, and further the position of the proximal section and the position of the middle section are kept relatively fixed.

In the above technical solution, preferably, the second limiting mechanism includes a second limiting ring and an adjusting device located at one side of the second limiting ring, and the adjusting device adjusts the friction force between the inner periphery of the middle section and the outer periphery of the distal section by adjusting the inner diameter of the second limiting ring.

The second adjusting device adjusts the inner diameter of the second limiting ring, when the inner diameter of the second limiting ring is smaller, the pressure of the second limiting ring on the middle section is larger, the middle section shrinks inwards under the pressure of the second limiting ring so as to enhance the friction force between the middle section and the far-side section, and further the position of the far-side section and the middle section is kept relatively fixed, and as the outer sheath is attached in the far-side cavity, when the length of the far-side section inserted into the middle section is increased or decreased, the absolute length of the outer sheath extending out can be correspondingly increased or decreased under the condition that the position of the handle is fixed.

In the above-described aspect, preferably, the intermediate section is provided with a scale on an outer peripheral side thereof.

The scales are arranged on the outer peripheral side of the middle section, so that the moving length of the first limiting ring and/or the second limiting ring can be clearly known, and the operation of a doctor is facilitated.

In the above technical solution, preferably, the proximal portion of the distal section is inserted into the middle cavity of the middle section.

In the above technical solution, preferably, a distal portion of the intermediate section is inserted into a distal cavity of the distal section.

Thus, when the distal segment is secured to the endoscope by a luer lock or other means, the extended length of the outer sheath, i.e., the length of the outer sheath extending into the body tissue, can be adjusted by moving the intermediate segment.

In the above technical solution, preferably, a stylet is inserted through the middle of the needle, one end of the stylet is inserted into the needle, the other end of the stylet is located outside the proximal section, a fixing head is arranged at one end of the stylet located at the proximal section, and the diameter of the fixing head is larger than that of the proximal opening of the proximal cavity.

Because the diameter of the fixed head is larger than the inner diameter of the cavity at the near side, the needle core can be ensured to be fixed on the handle, and the use is not influenced because the needle core completely enters the handle due to misoperation.

Compared with the prior art, the utility model provides a puncture needle, which comprises a handle, a needle and an outer sheath, wherein the handle comprises a near section, a middle section and a far section, the three components are mutually sleeved, the needle is arranged in the outer sheath in a penetrating way, one end of the outer sheath is attached in the middle cavity, the other end of the outer sheath extends outwards along the far cavity, and the length of the outer sheath and the length of the needle extending out of the outer sheath can be conveniently adjusted by adjusting the relative position relationship of the near section, the middle section and the far section; the free end of the proximal section or the periphery of the needle is also provided with a channel communicated with the needle, a guide wire can be placed in the needle through the channel, and secondary damage to tissues and organs of a patient caused by the guide wire placement and the negative pressure adsorption during respective operation is avoided.

Drawings

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, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic structural view of the puncture needle of the utility model;

FIG. 2 is a schematic cross-sectional view of FIG. 1;

FIG. 3 is a schematic view of the puncture needle according to another operation state of the present invention;

FIG. 4 is a cross-sectional structural schematic view of the outer sheath of FIG. 1;

FIG. 5 is a schematic view of the seal construction;

fig. 6 is another schematic structural diagram of the puncture needle of the present invention.

In the figure: 1. an outer sheath; 11. a through hole; 2. a needle; 3. a proximal section; 31. a proximal cavity; 4. a middle section; 41. a middle cavity; 5. a distal section; 51. a distal cavity; 6. a first limiting mechanism; 7. a second limiting mechanism; 8. a seal member; 9. a channel.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be described in detail below. It is to be understood that the embodiments described are only some embodiments of the invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in fig. 1, and are only for convenience of description and to simplify the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.

FIG. 1 is a schematic structural view of the puncture needle of the present invention; the puncture needle can be seen to consist of three parts, namely a handle, an outer sheath and a needle, wherein the handle mainly consists of a proximal section, a middle section and a distal section, and two limiting mechanisms are arranged on the handle, wherein the distal section is inserted into the middle cavity.

FIG. 2 is a schematic cross-sectional view of FIG. 1; the proximal, intermediate and distal segments are seen to be nested within one another.

FIG. 3 is a schematic structural view of the puncture needle of the present invention in another operation state; it can be seen from the figures that most of the structure of the intermediate section extends into the proximal cavity.

FIG. 4 is a schematic cross-sectional view of the sheath of FIG. 1; as can be seen from the figure, a channel for a guide wire or the like to pass through is arranged on the periphery of the free end of the outer sheath.

FIG. 5 is a schematic view of the seal construction; the specific structure of the seal can be seen in the figure.

Fig. 6 is another schematic structural diagram of the puncture needle of the present invention, and it can be seen from the figure that the puncture needle is composed of a handle, an outer sheath and a needle, wherein the handle is mainly composed of a proximal section, a middle section and a distal section, and two limiting mechanisms are arranged on the handle, wherein the middle section is inserted into the distal cavity.

As shown in fig. 1-6, the present invention provides a puncture needle, comprising an outer sheath, a needle and a handle, wherein the handle comprises a proximal section, a middle section and a distal section, the proximal section 3 is provided with a proximal cavity 31 with two open ends along the length direction, the size and shape of the proximal cavity 31 are designed to accommodate an endoscopic medical device therein; the proximal part of the middle section 4 is inserted into the proximal cavity 31 of the proximal section 3, the middle section 4 is provided with a middle cavity 41 with two open ends along the length direction, and the middle cavity 41 is communicated with the proximal cavity 31; the axial center position of the far-side section 5 is provided with a far-side cavity 51 with two open ends along the length direction, the far-side cavity 51 is communicated with the middle cavity 41, and the far-side section 5 and the middle section 4 are mutually sleeved; wherein the intersection of the proximal section 3 and the intermediate section 4 is provided with first limiting means 6 for limiting the advancement and retraction of the needle 2 inserted into the intermediate cavity 41, the distal cavity 51 along the axis of the proximal cavity 31, and the intersection of the intermediate section 4 and the distal section 5 is provided with second limiting means 7 for limiting the advancement and retraction of the outer sheath 1 attached to the intermediate cavity 41; the sheath 1 is a hollow structure, one end of the sheath is fixedly arranged at the near side part of the middle cavity 41, and the other end of the sheath is arranged along the length direction of the middle cavity 41 towards the direction of the far side section 5; the free end of the sheath 1 is provided with a through hole 11 for the free end of the needle 2 to pass through, and the other end of the needle 2 is fixedly arranged at the free end of the near-side section 3; a channel 9 is also provided at the free end of the proximal section 3 or at the outer circumference of the needle 2, the channel 9 communicating with the needle 2.

The free end of the proximal section 3 of the puncture needle or the periphery of the needle 2 is provided with a channel, so that a guide wire can be inserted into the needle 2 through the channel, the puncture needle can be simultaneously connected with the needle and the guide wire when in use, and the two operations of negative pressure puncture and guide wire positioning are realized by the same puncture needle, thereby avoiding that the puncture needle is inserted twice or a plurality of wounds are made on a patient to increase the pain of the patient; in addition, because the handle is composed of three mutually sleeved parts of the proximal section 3, the middle section 4 and the distal section 5, the sheath 1 is fixedly arranged in the second limiting mechanism 7, and the second limiting mechanism 7 can adjust the length of the distal section 5 inserted into the middle cavity 41, the length of the distal section 5 inserted into the middle cavity 41 can be adjusted through the second limiting mechanism 7, and meanwhile, the length of the sheath 1 can also be adjusted through the second limiting mechanism 7; the needle 2 is inserted into the sheath 1, when the length of the sheath 1 is unchanged, the length of the handle is adjusted by adjusting the length of the middle section 4 inserted into the near-side cavity 31 through adjusting the first limiting mechanism 6, and when the length of the handle is changed, the length of the part, protruding out of the free end of the needle 2, relative to the sheath 1 is also changed due to the fact that the position of the needle 2, inserted into the near-side cavity 31, relative to the near-side section 3 is unchanged, and therefore the protruding length of the needle 2 is adjusted.

Specifically, a stylet is arranged in the middle of the needle 2 in a penetrating manner, one end of the stylet is inserted into the needle 2, and the other end of the stylet is positioned outside the proximal section of the handle. The needle 2 is a hollow structure, and a needle core is arranged in the needle 2, when the negative pressure puncture operation is carried out, the needle core needs to be pulled out from the needle 2, so that a negative pressure environment is formed in a hollow pipeline of the needle 2, and a cavity for containing tissue fluid is formed in the needle 2, so that human tissues are sucked; after the needle 2 has aspirated enough tissue, the needle 2 is withdrawn, followed by retraction of the outer sheath 1, withdrawal of the puncture needle, and subsequent insertion of the core into the hollow channel of the needle 2 outside the body, in order to push out tissue fluids and the like that enter the hollow channel in the needle 2 during the puncture.

In particular, the hollow channel of the needle 2 can be used for placing a guide wire.

Specifically, to facilitate withdrawal of the core, a retaining head having a diameter greater than the inner diameter of the proximal cavity 31 is provided at the end of the core proximal to the handle. Because the diameter of the fixed head is larger than the inner diameter of the near side cavity 31, the needle core can be ensured to be fixed on the handle, and the use is not influenced because the needle core completely enters the handle due to misoperation. In particular, the fixation head may have a diameter that is larger than the diameter of the proximal opening.

It will be noted that, when the needle 2 projects outwards with respect to the free end of the proximal section 3 of the needle, the channel 9 is located on the peripheral side of the needle 2 and is connected to the inside of the needle 2; when the end of the needle 2 is at the free end of the proximal section 3 of the needle, the channel 9 is located on the proximal section 3 and is connected to the inside of the needle 2.

When other built-in medical devices such as a stent and the like need to be placed at a specific position in a patient body, the puncture needle can be used for positioning in advance to determine the placement position, and then the stent can be directly conveyed to a related position without drawing out the puncture needle (namely, without secondary puncture), so that the through holes of the patient are reduced, and the operation precision is improved.

As an alternative embodiment, a sealing member 8 is provided at the passage 9, and the sealing member 8 is used for closing the passage 9.

When only one needle 2 is inserted into the handle and the channel 9 is not used, the channel 9 can be closed by the sealing member 8, so that the body fluid is prevented from entering the outer sheath 1 through the channel 9 to pollute the needle 2; and at the same time, the negative pressure environment in the sheath 1 can be maintained.

As an alternative embodiment, the sealing member 8 is a cap-shaped structure, and the sealing member 8 comprises a fixedly connected sealing head and a hand-held portion, and the cross section of the sealing head is the same as that of the channel 9.

Since the cross-section of the sealing head is the same as the cross-section of the channel, the channel can be completely sealed when the seal 8 is inserted into the channel 9.

As an alternative embodiment, the sealing member 8 is a cap-shaped structure, and the sealing member 8 includes a fixedly connected sealing head and a hand-held portion, and the sealing head is connected with the channel 9 in an interference fit manner.

As an alternative embodiment, the seal 8 is a rotational fastening device.

As an alternative embodiment, the channel 9 is externally extended to form a branch pipe, the outside of which is provided with an external thread, and the corresponding primary part of the rotary fastening device is provided with an internal thread matching the external thread.

The branch pipe and the rotary fastening means are fixedly connected by means of a screw thread, thereby closing the passage 9.

As an alternative embodiment, a rubber pad is provided inside the rotating fastening device.

A rubber pad is arranged in the rotary fastening device, and when the rotary fastening device is in threaded connection with the branch pipe, the rubber pad is extruded under pressure, so that the channel 9 can be better sealed, and the device is ensured to be airtight after being screwed down.

As an alternative embodiment, the angle between the axis of the channel 9 and the axis of the proximal segment is less than 90 degrees.

The included angle is less than 90 degrees to facilitate passage of the guidewire through the passageway.

As an alternative embodiment, the proximal portion of the distal section 5 is inserted inside the intermediate cavity 41 of the intermediate section 4.

As an alternative embodiment, the distal portion of the intermediate section 4 is inserted within the distal cavity 51 of the distal section 5.

At this time, the distal section 5 is fixed to the endoscope by a luer lock or other means, and since the outer sheath 1 is fixedly disposed in the intermediate cavity 41, the length of the intermediate section 4 and the distal section 5 sleeved to each other can be changed by moving the intermediate section 4, so as to adjust the extension length of the outer sheath 1, i.e. the length of the outer sheath 1 extending into the tissue of the human body.

As an alternative embodiment, the first limiting mechanism 6 comprises a first limiting ring and a first adjusting device located outside the first limiting ring, and the first adjusting device adjusts the friction force between the inner periphery of the proximal section 3 and the outer periphery of the middle section 4 by adjusting the inner diameter of the limiting ring. The first adjusting device adjusts the inner diameter of the first limiting ring, when the inner diameter of the first limiting ring is smaller, the pressure of the first limiting ring on the proximal section 3 is larger, the proximal section 3 contracts inwards under the pressure of the first limiting ring so as to enhance the friction force between the proximal section 3 and the middle section 4, and further maintain the relative fixation of the positions of the proximal section 3 and the middle section 4, and when the position of the needle 2 is unchanged, the length of the middle section 4 inserted into the proximal section 3 is increased or reduced, so that the needle 2 extends or retracts relative to the sheath 1, and thus the adjustment of the length of the needle 2 extending out of the sheath 1 is realized.

In particular, the proximal section 3 is shaped as a hollow cylinder and the inner diameter of its proximal cavity 31 is not smaller than the outer diameter of the intermediate section 4, the cross-sectional shape of the proximal section 3 may be a non-positive annular structure without departing from the scope of the present invention; the peripheral side of the proximal section 3 may be tapered in shape so that its diameter increases towards its middle portion, so that its proximal and distal ends have a smaller diameter than the diameter of the middle portion.

In particular, the proximal section 3 may also be provided with ergonomic grooves on its surface, so that the physician can better grip and manipulate the handle, it being noted that the surface of the proximal section 3 may be configured with any number and kind of grooves or abutments that facilitate ergonomic handling without departing from the scope of the present invention. The proximal section 3 may also be provided with a soft grip coating (e.g., a thermoplastic elastomer) or another surface modification or coating to aid in handling.

In addition, the proximal section 3 comprises a proximal opening, preferably sized to just allow passage of the needle 2.

In particular, the intermediate section 4 extends distally a predetermined distance from the proximal section 3 and has a substantially circular cross-section. The diameter of the intermediate section 4 in this embodiment may be about 8-15 mm. The intermediate section 4, although fixedly connected to the proximal section 3, remains rotatable relative thereto. That is, rotation of the proximal segment 3 does not cause rotation of the intermediate segment 4. In one embodiment of the present invention, the proximal section 3 comprises a radial groove formed on the inner wall of its distal edge, which groove is configured to rotatably engage with a radial abutment formed on the outer wall of the proximal edge of the intermediate section 4. Alternatively, any connection may be forged between proximal section 3 and intermediate section 4 without departing from the scope of the present invention.

In particular, the first defining means 6 may be formed as a ring extending around a portion of the outer circumferential side of the distal portion of the proximal section 3, which ring may be fixed on the circumferential side of the proximal section 3 by friction fit or any other suitable attachment means known in the art and may be held in place. The ring includes a pair of slots extending substantially perpendicular to the longitudinal axis of the proximal section 3 and having a length less than the circumference of the ring, the slots being configured to allow the device to be locked in a desired configuration.

In an alternative embodiment, the second limiting mechanism 7 comprises a second limiting ring and an adjusting device arranged on one side of the second limiting ring, and the adjusting device adjusts the friction force between the inner periphery of the middle section 4 and the outer periphery of the distal section 5 by adjusting the inner diameter of the second limiting ring.

The second adjusting device adjusts the inner diameter of the second stop collar, when the inner diameter of the second stop collar is smaller, the pressure of the second stop collar on the middle section 4 is larger, the middle section 4 contracts inwards under the pressure of the second stop collar to increase the friction force between the middle section 4 and the distal section 5, so as to maintain the relative fixation of the positions of the distal section 5 and the middle section 4, and because the outer sheath 1 is attached in the middle cavity 41, when the length of the distal section 5 inserted into the middle cavity 41 increases or decreases, the extending length of the outer sheath 1 can also correspondingly increase or decrease under the condition that the position of the distal section 5 is fixed, that is, the length of the outer sheath 1 inserted into the human tissue changes, and if the position of the needle 2 is not changed at this time, the needle 2 extends outwards relative to the outer sheath 1.

As an alternative embodiment, the outer periphery of the middle section 4 is provided with a scale.

The scales are arranged on the outer peripheral side of the middle section 4, so that the moving length of the first limiting ring and/or the second limiting ring can be clearly known, and the operation of a doctor is facilitated.

In particular, the contour of the inner surface of the ring adjacent the outer surface of the intermediate section 4 of the distal section 5 is non-circular (e.g., elliptical), while the second adjustment means of the second limiting mechanism 7 comprises one or more arms (not shown) extending from a portion of the knob positioned between the ring and the outer surface of the distal section, the arms being dimensioned to be positioned within a space formed between a larger diameter portion of the non-circular inner surface of the ring and the intermediate section 4 when the knob is rotated to the first orientation, such that the ring is loosely held around the intermediate section 4. Rotation of the knob to a second orientation (e.g., 90 degrees relative to the first orientation) moves the arms into the smaller space between the reduced diameter portion of the non-circular inner surface of the ring and the intermediate section 4 so that the ring tightly compresses the intermediate section 4 to lock the position of the distal section 5 and the intermediate section 4.

The distal segment 5 is sized and shaped to be slidably received within the intermediate cavity 41 and telescopically movable therefrom. When the distal section 5 is manually moved to the desired position (guided by the scale provided on the outer circumferential side of the intermediate section 4), the second limiting mechanism 7 is tensioned to apply a torque to the intersection of the distal section 5 and the intermediate section 4, thereby locking the position of the distal section 5. The distal section 5 further comprises a distal opening, preferably sized to just allow the outer sheath 1 to pass through. Since the needle 2 of the puncture needle is very sharp and is damaged by moving directly in the endoscope, the needle 2 needs to be disposed in the sheath 1, and in addition, the sheath 1 needs to be extended first and then the needle 2 needs to be removed when the puncture operation is performed.

The above embodiments are only specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of changes or substitutions within the technical scope of the present invention, and all should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (10)

1. The puncture needle is characterized by comprising an outer sheath (1), a needle (2) and a handle, wherein the handle comprises a proximal section (3), a middle section (4) and a distal section (5),

the proximal section (3) is provided with a proximal cavity (31) with two open ends along the length direction, and the size and the shape of the proximal cavity (31) are designed to accommodate an endoscopic medical device therein;

the middle section (4) penetrates through two ends of the middle section (4) so as to form a middle cavity (41) in the middle of the middle section (4), and a near side part of the middle section (4) is inserted into a near side cavity (31) of the near side section (3) so as to enable the middle cavity (41) to be communicated with the near side cavity (31);

the far-side section (5) is provided with a far-side cavity (51) penetrating through openings at two ends along the axial direction, the far-side cavity (51) is communicated with the middle cavity (41), and the far-side section (5) and the middle section (4) are mutually sleeved;

wherein the intersection of the proximal section (3) and the intermediate section (4) is provided with first limiting means (6) for limiting the advancement and retraction of the needle (2) inserted into the intermediate cavity (41), the distal cavity (51) along the axis of the proximal cavity (31), the intersection of the intermediate section (4) and the distal section (5) is provided with second limiting means (7) for limiting the advancement and retraction of the outer sheath (1) attached to the intermediate cavity (41);

the outer sheath (1) is of a hollow structure, one end of the outer sheath is fixedly arranged at the near side part of the middle cavity (41), and the other end of the outer sheath is arranged along the length direction of the middle cavity (41) towards the direction of the far side section (5); a through hole (11) for the free end of the needle (2) to pass through is formed in the free end of the sheath (1), and the other end of the needle (2) is fixedly arranged at the free end of the proximal section (3);

a channel (9) is further arranged at the free end of the proximal section (3) or the periphery of the needle (2), and the channel (9) is communicated with the needle (2).

2. A puncture needle according to claim 1, characterized in that a seal (8) is provided at the passage (9), the seal (8) being intended to close the passage (9).

3. A puncture needle according to claim 2, characterized in that the seal (8) is of a cap-shaped construction, the seal (8) comprising a fixedly connected sealing head and a handle, the sealing head having the same cross-section as the passage (9).

4. A puncture needle according to claim 2, characterized in that the seal (8) is a rotational fastening device.

5. A puncture needle according to claim 4, characterized in that the passage (9) is externally extended to form a branch pipe, which is externally provided with an external thread, and the sealing element (8) is provided with an internal thread at a corresponding location in cooperation with the external thread.

6. A puncture needle according to claim 5, characterized in that the inner end of the rotary fastening device is provided with a rubber pad.

7. A puncture needle according to claim 1, characterized in that the angle between the axis of the channel (9) and the axis of the proximal section is less than 90 degrees.

8. A puncture needle according to claim 1, characterized in that the first limiting mechanism (6) comprises a first stop ring and a first adjusting device outside the first stop ring, which adjusts the friction between the inner circumference of the proximal section (3) and the outer circumference of the intermediate section (4) by adjusting the size of the inner diameter of the stop ring.

9. A puncture needle according to claim 1, wherein the outer peripheral side of the intermediate section (4) is provided with graduations.

10. A puncture needle according to claim 1, characterized in that a proximal portion of the distal section (5) is inserted in the intermediate cavity (41) of the intermediate section (4) or a distal portion of the intermediate section (4) is inserted in the distal cavity (51) of the distal section (5).

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