CN219645840U - Interventional puncture biopsy assembly - Google Patents

Abstract

The utility model provides an interventional puncture biopsy assembly, which belongs to the technical field of medical instruments and comprises an introducing sheath, a positioning stiffening tube, an inner liner tube, a positioning puncture needle and a positioning biopsy puncture needle, wherein a first sensor is arranged in a first needle body of the positioning puncture needle and is connected with magnetic navigation equipment; a second sensor is arranged in a second needle body for positioning the biopsy puncture needle, and the second sensor is connected with the magnetic navigation equipment; through the first needle body installation of location pjncture needle is connected in the first sensor of magnetic navigation equipment and the second sensor of location puncture biopsy needle in the second needle body installation of being connected in magnetic navigation equipment, can show the position of first needle body and second needle body on magnetic navigation equipment in real time, can assist medical personnel to carry out the puncture operation, reduced the dependence to medical personnel clinical experience.

Description

Interventional puncture biopsy assembly

Technical Field

The utility model relates to the technical field of medical instruments, in particular to an interventional puncture biopsy assembly.

Background

The puncture biopsy is a medical means for diagnosing pathological tissues, and is mainly used for diagnosing diseases such as tumor, infection, liver diseases and the like. The tissue and cell samples of the patient can be obtained by using the biopsy kit device, a direct and clear diagnosis result is provided, the diagnosis of the disease condition and the selection of a treatment scheme are very critical, meanwhile, compared with the traditional operation, the biopsy technique has the advantages of smaller puncture caliber, less injury and recovery time to the patient, and reduced operation risk of medical staff, and the medical staff has shorter operation time, is suitable for detecting smaller lesions and has relatively lower cost when using the biopsy instrument.

The aspiration biopsy technique comprises an aspiration technique, a sampling technique and a histological technique, wherein the aspiration technique is a core technique of the aspiration biopsy and relates to a plurality of subject fields such as anatomy, biomechanics and the like. Sampling technique is a very important link in aspiration biopsy, which directly determines the accuracy and clinical value of diagnosis. Histological techniques are key techniques for accurate analysis and diagnosis of biopsy samples. The doctor needs to process, slice, dye and other histological operations on the collected biopsy samples, and the morphological and structural analysis of the cells is carried out under a microscope to judge the morphological, number and arrangement characteristics of normal and abnormal cells so as to determine the type, degree and prognosis of the disease.

However, in the actual clinical diagnosis process, the existing parts of the focus are various, in the prior art, doctors need to know the characteristics of the body part, illness state, tissue type and the like of a patient, select proper puncture modes and tools according to clinical experience, judge depth and direction, and perform positioning and puncture operation, and the operation modes have strong dependence on the clinical experience of medical staff and cannot be effectively monitored.

Disclosure of Invention

Therefore, the technical problem to be solved by the utility model is to overcome the defect that effective monitoring cannot be realized during the biopsy of the puncture in the prior art, thereby providing an interventional biopsy assembly.

To this end, the present utility model provides an interventional biopsy assembly comprising an introducer sheath having a first cavity insertable into a patient for guiding a penetrating instrument into a lesion; a positioning stiffening tube having a second cavity, the positioning stiffening tube penetrating into the first cavity of the introducer sheath; a liner tube having a third cavity, the liner tube penetrating into the second cavity of the positioning stiffening tube; a positioning puncture needle comprising a first needle body, the positioning puncture needle penetrating into the third cavity of the inner liner tube for interventional puncture; a first sensor is arranged in the first needle body and is connected with the magnetic navigation equipment; a positioning biopsy needle comprising a second needle body, the positioning biopsy needle penetrating into the third cavity of the liner tube for tissue sampling of a lesion; and a second sensor is arranged in the second needle body and is connected with the magnetic navigation equipment.

Optionally, the positioning puncture needle comprises a first channel therein, and the first sensor is installed in the first channel.

Optionally, the first channel includes a first open end and a first closed end, the first closed end being located at a rear portion of the first needle tip, the first open end being located at a rear portion of the first needle.

Optionally, the first sensor is mounted within the first channel proximate the first closed end.

Optionally, the positioning puncture needle comprises a first handle, a first device interface is arranged on the first handle, and the first sensor is connected with the magnetic navigation device through the first device interface.

Optionally, the positioning biopsy needle includes a second channel, the second sensor being mounted within the second channel.

Optionally, the second channel includes a second open end and a second closed end, the second closed end being located at a rear portion of the second needle tip, the second open end being located at a rear portion of the second needle.

Optionally, the second sensor is mounted within the second channel proximate the second closed end.

Optionally, the positioning biopsy puncture needle comprises a second handle, a second device interface is arranged on the second handle, and the second sensor is connected with the device through the second device interface.

Optionally, the positioning stiffening pipe comprises a pipe body, the pipe body is provided with a directional straight section, the directional straight section is matched with the positions of the first sensor and the second sensor, and the length of the directional straight section is 5-30mm.

The technical scheme of the utility model has the following advantages:

1. the utility model provides an interventional puncture biopsy assembly comprising:

an introducer sheath, a positioning stiffening tube, an inner liner tube, a positioning puncture needle and a positioning biopsy puncture needle, wherein the introducer sheath is provided with a first cavity and can be inserted into a patient for guiding a puncture instrument to enter a focus part; the positioning stiffening pipe is provided with a second cavity, and penetrates into the first cavity of the guide sheath; the lining pipe is provided with a third cavity, and penetrates into the second cavity of the positioning stiffening pipe; the positioning puncture needle comprises a first needle body, and the positioning puncture needle penetrates into the third cavity of the lining tube for interventional puncture; a first sensor is arranged in the first needle body and is connected with the magnetic navigation equipment; the positioning biopsy puncture needle comprises a second needle body, penetrates into the third cavity of the lining tube and is used for tissue sampling of a focus; and a second sensor is arranged in the second needle body and is connected with the magnetic navigation equipment.

Through the first needle body installation of location pjncture needle is connected in the first sensor of magnetic navigation equipment and the second sensor of location puncture biopsy needle in the second needle body installation of being connected in magnetic navigation equipment, can show the position of first needle body and second needle body on magnetic navigation equipment in real time, can assist medical personnel to carry out the puncture operation, reduced the dependence to medical personnel clinical experience.

2. The interventional puncture biopsy assembly provided by the utility model comprises a first channel in the positioning puncture needle, and the first sensor is arranged in the first channel.

The first channel is arranged in the positioning puncture needle, so that the first sensor and the positioning puncture needle can be conveniently fixed, and the first sensor can be conveniently installed.

3. The first channel comprises a first opening end and a first closing end, wherein the first closing end is positioned at the rear part of the needle point of the first needle body, and the first opening end is positioned at the tail part of the first needle body.

Through set up first open end at first needle afterbody, can make the more smooth and easy first needle body that gets into of first sensor location pjncture needle, through setting up first closed end, can avoid first sensor not because of getting into the focus and then cause the operation infection.

4. The utility model provides an interventional aspiration biopsy assembly, wherein a first sensor is mounted in the first channel near the first closed end.

The first sensor is arranged at a position close to the first closed end, so that the positioning accuracy of the positioning puncture needle can be enhanced, and the positioning is more accurate.

5. The interventional puncture biopsy assembly provided by the utility model comprises a first handle, wherein a first equipment interface is arranged on the first handle, and the first sensor is connected with the magnetic navigation equipment through the first equipment interface.

Through set up first equipment interface on the first handle of location pjncture needle, can fix first sensor, prevent that first sensor from removing in first passageway and then influence the accuracy of control.

6. The utility model provides an interventional puncture biopsy assembly, wherein a positioning biopsy puncture needle comprises a second channel, and a second sensor is arranged in the second channel.

The second channel is arranged in the positioning biopsy puncture needle, so that the second sensor and the positioning biopsy puncture needle can be conveniently fixed, and the second sensor can be conveniently installed.

7. The utility model provides an interventional puncture biopsy assembly, wherein the second channel comprises a second opening end and a second closing end, the second closing end is positioned at the rear part of a needle point of a second needle body, and the second opening end is positioned at the tail part of the second needle body.

Through set up the second open end at second needle afterbody, can make the second sensor more smooth and easy get into in the second needle of location biopsy pjncture needle, through setting up the second closed end, can avoid the second sensor not because of getting into the focus and then cause the operation infection.

8. The utility model provides an interventional aspiration biopsy assembly, wherein a second sensor is mounted in the second channel near the second closed end.

The second sensor is arranged at a position close to the second closed end, so that the positioning accuracy of the biopsy puncture needle can be enhanced, and the positioning is more accurate.

9. The interventional puncture biopsy assembly provided by the utility model comprises a second handle, wherein a second equipment interface is arranged on the second handle, and the second sensor is connected with equipment through the second equipment interface.

By providing a second device interface on the second handle that positions the biopsy needle, the second sensor may be secured against movement within the second channel thereby affecting the accuracy of the monitoring.

10. The positioning stiffening tube comprises a tube body, wherein the tube body is provided with a direct straight section, the direct straight section is matched with the specifications of the first sensor and the second sensor, and the length of the direct straight section is 5-30mm.

Through setting up the straight section that length is 5-30mm on the location stiffening body, can repair the orientation of location pjncture needle or location biopsy pjncture needle that stretches out by the bending section, guaranteed that the puncture biopsy advances along sharp, simultaneously, the orientation straight section that sets up according to the specification of first sensor and second sensor can ensure that the route of first sensor and second sensor sensing is sharp for the data of sensing is more accurate.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present utility model, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.

FIG. 1 is a cross-sectional view of an introducer sheath provided in an embodiment of the utility model;

FIG. 2 is a schematic diagram of a positioning stiffening pipe according to the present utility model;

FIG. 3 is a schematic view of the structure of the liner tube provided by the present utility model;

FIG. 4 is a schematic view of the structure of the positioning puncture needle according to the present utility model;

FIG. 5 is a cross-sectional view of the positioning needle provided by the present utility model;

FIG. 6 is a schematic view of the structure of the positioning biopsy needle provided by the present utility model;

FIG. 7 is a cross-sectional view of a positioning biopsy needle provided by the present utility model;

fig. 8 is a schematic illustration of a localized biopsy procedure provided by the present utility model.

Reference numerals illustrate:

1. an introducer sheath; 11. a first cavity; 2. positioning a stiffening pipe; 21. a second cavity; 22. pointing to the straight section; 3. an inner liner tube; 31. a third cavity; 4. positioning a puncture needle; 41. a first needle body; 42. a first sensor; 43. a first channel; 44. a first device interface; 45. a first open end; 46. a first closed end; 47. a first handle; 5. positioning a biopsy needle; 51. a second needle body; 52. a second sensor; 53. a second channel; 54. a second device interface; 55. a second open end; 56. a second closed end; 57. a second handle; 6. an expected target point; 7. planning a channel; 8. an ultrasound image region.

Detailed Description

The following description of the embodiments of the present utility model will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the utility model are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

In addition, the technical features of the different embodiments of the present utility model described below may be combined with each other as long as they do not collide with each other.

The interventional biopsy assembly provided in this embodiment, as shown in fig. 1-7, includes: an introducer sheath 1, a positioning stiffening tube 2, a lining tube 3, a positioning puncture needle 4 and a positioning biopsy puncture needle 5, wherein the introducer sheath 1 is provided with a first cavity 11 which can be inserted into a patient body for guiding a puncture instrument to enter a focus part; the positioning stiffening pipe 2 is provided with a second cavity 21, and the positioning stiffening pipe 2 penetrates into the first cavity 11 of the introducing sheath 1; the lining tube 3 is provided with a third cavity 31, and the lining tube 3 penetrates into the second cavity 21 of the positioning stiffening pipe 2; the positioning puncture needle 4 comprises a first needle body 41, and the positioning puncture needle 4 penetrates into the third cavity 31 of the lining tube 3 for interventional puncture; a first sensor 42 is arranged in the first needle body 41, and the first sensor 42 is connected with magnetic navigation equipment; the positioning biopsy needle 5 comprises a second needle body 51, and the positioning biopsy needle 5 penetrates into the third cavity 31 of the inner liner 3 for tissue sampling of a focus; a second sensor 52 is installed in the second needle 51, and the second sensor 52 is connected with the magnetic navigation device.

By installing the first sensor 42 connected to the magnetic navigation device in the first needle body 41 for positioning the puncture needle 4 and installing the second sensor 52 connected to the magnetic navigation device in the second needle body 51 for positioning the puncture biopsy needle, the positions of the first needle body 41 and the second needle body 51 can be displayed on the magnetic navigation device in real time, puncture operation can be assisted by medical staff, and dependency on clinical experience of the medical staff is reduced.

It should be noted that, as shown in fig. 1, a holding part is provided at one end of the introducing sheath 1 provided by the utility model, which is convenient for medical staff to hold, and the end face of the holding part can conveniently position the stiffening tube 2 and ensure that the stiffening tube 2 can rotate in the introducing sheath 1.

As shown in fig. 2, a handle is also arranged at one end of the positioning stiffening pipe 2, which is convenient for medical staff to operate.

As shown in fig. 3, the end of the lining tube 3 is also provided with an operation part, which is convenient for the medical staff to operate.

In this embodiment, the diameters of the first cavity 11, the second cavity 21 and the third cavity 31 are gradually reduced, meanwhile, the diameter of the first cavity 11 is slightly larger than the diameter of the outer wall of the positioning stiffening pipe 2, the diameter of the second cavity 21 is slightly larger than the diameter of the outer wall of the lining pipe 3, and the diameter of the third cavity 31 is slightly larger than the outer diameter of the first needle body 41 of the positioning puncture needle 4 and/or the second needle body 51 of the positioning biopsy puncture needle 5.

The first sensor 42 and the second sensor 52 may be of an integral structure or a split structure with the corresponding positioning puncture needle 4 and the positioning biopsy puncture needle 5, and in this embodiment, the split structure is adopted, so that the production can be facilitated.

As shown in fig. 5, the interventional puncture biopsy assembly provided in this embodiment includes a first channel 43 in the positioning puncture needle 4, and a first sensor 42 is mounted in the first channel 43.

The first channel 43 is arranged in the positioning puncture needle 4, so that the first sensor 42 and the positioning puncture needle 4 can be conveniently fixed, and the first sensor 42 can be conveniently installed.

It should be noted that, the first channel 43 may be disposed parallel to the outer wall of the positioning puncture needle 4, or may be disposed at an angle to the outer wall of the positioning puncture needle 4, and in this embodiment, the first channel 43 is disposed parallel to the outer wall of the positioning puncture needle 4, which is convenient for production and processing. When an angled arrangement is used, the length of the channel can be shortened, reducing the effort.

As shown in fig. 5, the interventional puncture biopsy assembly provided in this embodiment, the first channel 43 comprises a first open end 45 and a first closed end 46, the first closed end 46 is located at the rear of the tip of the first needle 41, and the first open end 45 is located at the rear of the first needle 41.

By arranging the first opening end 45 at the tail of the first needle body 41, the first sensor 42 can smoothly enter the first needle body 41 of the positioning puncture needle 4, and by arranging the first closing end 46, the first sensor 42 can be prevented from entering a focus to cause surgical infection.

It should be noted that, the position of the first closed end 46 is not further limited, and in this embodiment, the position of the first closed end 46 is disposed at the rear portion of the needle tip, and this manner of disposing makes the needle tip be a solid structure, so as to ensure the strength of the needle tip.

The present embodiment provides an interventional biopsy assembly with a first sensor 42 mounted within a first channel 43 near a first closed end 46.

Positioning the first sensor 42 near the first closed end 46 can enhance the positioning accuracy of the positioning needle 4 so that the positioning is more accurate.

It should be noted that, the position of the first sensor 42 in the first channel 43 is not limited specifically, and in this embodiment, the first sensor 42 is disposed at a position close to the first closed end 46, so that the positioning of the first sensor 42 is facilitated, and meanwhile, the length of the first needle 41 required to calculate the front end of the first sensor 42 in the subsequent calculation is reduced, and the accuracy of the calculation is improved.

As shown in fig. 4-5, the interventional puncture biopsy assembly provided in this embodiment, the positioning puncture needle 4 comprises a first handle 47, a first device interface 44 is provided on the first handle 47, and the first sensor 42 is connected to the magnetic navigation device through the first device interface 44.

By providing the first device interface 44 on the first handle 47 of the positioning lancet 4, the first sensor 42 can be fixed, preventing the first sensor 42 from moving within the first channel 43 and thereby affecting the accuracy of the monitoring.

It should be noted that, the first device interface 44 and the first handle 47 may be in threaded connection, or may be in a clamping connection or other detachable connection manners, and in this embodiment, the first device interface 44 and the first handle 47 are connected by adopting a clamping connection, so that the installation is convenient, and the production and the processing are time-saving and labor-saving.

As shown in fig. 7, the interventional puncture biopsy assembly provided in this embodiment, the positioning biopsy needle 5 comprises a second channel 53, and the second sensor 52 is mounted in the second channel 53.

The second channel 53 is arranged in the positioning biopsy puncture needle 5, so that the second sensor 52 and the positioning biopsy puncture needle 5 can be conveniently fixed, and the second sensor 52 can be conveniently installed.

It should be noted that, the second channel 53 may be disposed parallel to the channel of the outer wall of the positioning biopsy needle 5, or may be disposed at an angle to the outer wall of the positioning biopsy needle 5, and in this embodiment, the second channel 53 is disposed parallel to the channel of the outer wall of the positioning biopsy needle 5, which facilitates the production and processing. When an angled arrangement is used, the length of the channel can be shortened, reducing the effort.

As shown in fig. 7, the interventional puncture biopsy assembly provided in this embodiment, the second channel 53 includes a second open end 55 and a second closed end 56, the second closed end 56 is located at the rear of the needle tip of the second needle 51, and the second open end 55 is located at the rear of the second needle 51.

By arranging the second opening end 55 at the tail of the second needle body 51, the second sensor 52 can smoothly enter the second needle body 51 of the positioning biopsy puncture needle 5, and by arranging the second closing end 56, the second sensor 52 can be prevented from entering a focus to cause surgical infection.

It should be noted that, the position of the second closed end 56 is not further limited, in this embodiment, the position of the second closed end 56 is set at the rear portion of the needle tip, and the setting manner makes the needle tip be a solid structure, so as to ensure the strength of the needle tip.

The present embodiment provides an interventional biopsy assembly with a second sensor 52 mounted within the second channel 53 near the second closed end 56.

Positioning the second sensor 52 near the second closed end 56 can enhance the positioning accuracy of positioning the biopsy needle 5 so that positioning is more accurate.

It should be noted that, the position of the second sensor 52 in the second channel 53 is not limited specifically, and in this embodiment, the second sensor 52 is disposed at a position close to the second closed end 56, so that the positioning of the second sensor 52 is facilitated, and meanwhile, the length of the second needle 51 required to calculate the front end of the second sensor 52 in the subsequent calculation is reduced, and the accuracy of the calculation is improved.

As shown in fig. 6-7, the interventional puncture biopsy assembly provided in this embodiment, the positioning biopsy needle 5 comprises a second handle 57, the second handle 57 has a second device interface 54 thereon, and the second sensor 52 is connected to a device via the second device interface 54.

By providing the second device interface 54 on the second handle 57 that positions the biopsy needle 5, the second sensor 52 may be secured against movement of the second sensor 52 within the second channel 53, thereby affecting accuracy of monitoring.

It should be noted that, the second device interface 54 and the second handle 57 may be in threaded connection, or may be in a clamping connection or other detachable connection manners, and in this embodiment, the second device interface 54 and the second handle 57 are in a clamping connection, which is convenient to install, and time-saving and labor-saving in production and processing.

The interventional puncture biopsy assembly provided by the embodiment comprises a positioning stiffening tube 2, wherein the tube body is provided with a directional straight section 22, the directional straight section 22 is matched with the specifications of the first sensor 42 and the second sensor 52, and the length of the directional straight section 22 is 5-30mm.

Through setting up the straight section that length is 5-30mm on the body of location stiffening pipe 2, can repair the direction of location pjncture needle 4 or location biopsy pjncture needle 5 that stretches out by the bending section, guaranteed that the puncture biopsy is along sharp advancing, simultaneously, according to the directional straight section 22 that specification setting of first sensor 42 and second sensor 52, can ensure that the route of first sensor 42 and second sensor 52 sensing is sharp for the data of sensing is more accurate.

As shown in fig. 8, the magnetic navigation device provided by the present product can generate a target plane, the plane can coincide with the ultrasonic image area 8, the magnetic navigation image system can calculate the position of the sensor through the sensor signal, and calculate the relative position of the product by combining the product structure, and calculate the planned channel 7 and the expected target point 6 according to the determined relative position of the sensor and the magnetic field plane.

The interventional puncture biopsy assembly provided by the utility model has the specific operation procedures that: the positioning needle 4 (or the positioning biopsy needle 5) is first assembled with the liner tube 3, this assembly being referred to as a positioning needle assembly in this embodiment. The stiffening tube 2 is then assembled with the introducer sheath 1, this assembly being referred to in this embodiment as a stiffening element. Finally, the positioning puncture assembly is penetrated into the positioning reinforcement assembly, and the puncture tip is flush with the tip of the introducer sheath 1. The reinforcement assembly is positioned rotationally at the puncture point, and the navigation system is referenced in vitro to find the intended target 6 in the invisible in vivo through ultrasonic imaging. The magnetic navigation system will then calculate the planned channel 7 showing the puncture with the intended target 6. Thereafter, the puncture path can be scanned by ultrasound, and the puncture path safety can be confirmed by imaging. After the puncture safety is confirmed, the expected target point 6 is confirmed again, and the puncture assembly is pushed to puncture after the reinforcement assembly is stably positioned. The puncture process navigation system displays and positions the tip position of the puncture assembly in real time, the ultrasonic image can realize image confirmation of the target position, and finally, safe and visible puncture is realized.

It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. While still being apparent from variations or modifications that may be made by those skilled in the art are within the scope of the utility model.

Claims (10)

1. An interventional biopsy assembly, comprising:

an introducer sheath (1) having a first lumen (11) insertable into a patient for introducing a penetrating instrument into a focal site;

a positioning stiffening tube (2) having a second cavity (21), the positioning stiffening tube (2) penetrating into the first cavity (11) of the introducer sheath (1);

-a lining tube (3) having a third cavity (31), said lining tube (3) penetrating into said second cavity (21) of said positioning stiffening tube (2);

a positioning puncture needle (4) comprising a first needle body (41), the positioning puncture needle (4) penetrating into the third cavity (31) of the lining pipe (3) for interventional puncture; a first sensor (42) is arranged in the first needle body (41), and the first sensor (42) is connected with magnetic navigation equipment;

a positioning biopsy needle (5) comprising a second needle body (51), the positioning biopsy needle (5) penetrating into the third cavity (31) of the liner tube (3) for tissue sampling of a lesion; a second sensor (52) is arranged in the second needle body (51), and the second sensor (52) is connected with the magnetic navigation equipment.

2. The interventional needle biopsy assembly of claim 1, wherein the positioning needle (4) comprises a first channel (43) therein, the first sensor (42) being mounted within the first channel (43).

3. The interventional needle biopsy assembly of claim 2, wherein the first channel (43) comprises a first open end (45) and a first closed end (46), the first closed end (46) being located rearward of the needle tip of the first needle body (41), the first open end (45) being located rearward of the first needle body (41).

4. An interventional biopsy assembly according to claim 3, wherein the first sensor (42) is mounted within the first channel (43) near the first closed end (46).

5. The interventional needle biopsy assembly of claim 1, wherein the positioning needle (4) comprises a first handle (47), the first handle (47) having a first device interface (44) thereon, the first sensor (42) being connected to the magnetic navigation device via the first device interface (44).

6. The interventional biopsy assembly of claim 1, wherein the positioning biopsy needle (5) comprises a second channel (53), the second sensor (52) being mounted within the second channel (53).

7. The interventional biopsy assembly of claim 6, wherein the second channel (53) comprises a second open end (55) and a second closed end (56), the second closed end (56) being located rearward of the needle tip of the second needle (51), the second open end (55) being located rearward of the second needle (51).

8. The interventional biopsy assembly of claim 7, wherein the second sensor (52) is mounted within the second channel (53) proximate the second closed end (56).

9. The interventional biopsy assembly of claim 8, wherein the positioning biopsy needle (5) comprises a second handle (57), the second handle (57) having a second device interface (54) thereon, the second sensor (52) being connected to a device via the second device interface (54).

10. The interventional needle biopsy assembly of claim 1, wherein the stiffening tube (2) comprises a tube body having a straight pointing section (22), the straight pointing section (22) being matched to the position of the first sensor (42) and the second sensor (52) with a length of 5-30mm.