A double-shot biopsy gun

Abstract

A double-shot biopsy gun, comprising an inner core needle, an outer tube needle and a rear-end ejection device. The rear-end ejection device includes an upper housing, a lower housing and a slider. Corresponding chutes are provided inside the upper housing and the lower housing. One end of the slider is arranged in the chute and can move along the chute. An inner core needle firing assembly and an outer tube needle firing assembly are arranged inside the lower housing. A first button assembly and a second button assembly are arranged inside the upper housing. The slider abuts against the inner core needle firing assembly and the outer tube needle firing assembly and can press the inner core needle and the outer tube needle to a depressed state. Compared with the prior art, for lesion tissues with sufficient safety space, the present invention can achieve one-key operation to complete the step-by-step firing of the inner core needle and the outer tube needle. In the case of insufficient safety space for manipulation, the inner core needle can be fired in place first, then extended from the pre-positioned cannula needle channel, and the distance of the extended cannula needle can be gradually controlled, so as to effectively control the walking displacement in the lesion area.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and particularly relates to a double-firing biopsy gun. Background Art

[0002] A tumor is a lesion formed by the abnormal clonal proliferation of a single cell in a local tissue at the gene level under the action of various carcinogenic factors, generally divided into two major categories: benign and malignant.

[0003] Early detection, correct diagnosis, and timely treatment have an important impact on the prognosis. With the continuous upgrading of examination means and methods, the diagnostic accuracy rate has gradually increased. However, a large part of tumors still do not have typical imaging characteristics, making diagnosis difficult. A correct diagnosis requires the combination of clinical, imaging, and pathology. Among them, pathological diagnosis plays a key role in the selection of treatment plans. Percutaneous biopsy is the main way to obtain pathological diagnosis.

[0004] A disposable biopsy needle is a device used to obtain histological specimens by cutting through percutaneous puncture of organs or tissues under ultrasound or CT imaging for pathological diagnosis.

[0005] Currently, the biopsy needle mainly includes an outer cannula needle, an inner core needle, and a sampling groove is provided on the inner core needle. The outer cannula needle is sleeved outside the inner core needle and is installed on the needle holder together. The specimen is obtained by a controllable ejection device. When in use, when the percutaneous puncture reaches the sampling site under image monitoring, the inner core needle first penetrates so that the sampling groove is located at the lesion, and then the ejection device shoots out the outer cannula needle. The outer cannula needle rushes forward, cutting the tissue at the lesion site into the sampling groove of the inner core needle, and the biopsy needle can be pulled out to obtain the sampling specimen.

[0006] Existing biopsy needles include fully automatic biopsy needles and semi-automatic biopsy needles. The difference lies in the ejection device. The ejection device of the fully automatic biopsy needle is a one-key firing, which simultaneously completes the firing of the outer cannula needle and the inner core needle. While the ejection device of the semi-automatic biopsy needle is a multi-step firing. First, the inner core needle is fired, and then the outer cannula needle is fired. These two types of biopsy needles cannot be flexibly used in clinical practice. When encountering lesions with high puncture risks, there is no way to switch to the double-key firing mode of the semi-automatic type, which requires high clinical operation skills. Therefore, we have developed a biopsy needle that combines full automation and semi-automation, which can simultaneously have fully automatic and semi-automatic ejection devices and can be switched at will. On the other hand, among the biopsy guns commonly used in the market, such as the fully automatic biopsy gun of BARD Company, the handle is relatively thick and heavy. Due to its own heavy weight, it is not suitable for puncture under CT, resulting in most biopsy guns used clinically under CT being semi-automatic biopsy guns, and the operation is not simple enough. Moreover, due to structural reasons, such as the fully automatic biopsy needle produced by BARD Company, the pressing and pushing of the ejection device of the current conventional biopsy needle are both laborious. After the puncture is in place, when firing, the biopsy needle often moves due to the need to push the button laboriously, affecting the accuracy of the puncture. Summary of the Invention

[0007] In view of the above-mentioned defects in the prior art, the present invention provides a double-firing biopsy gun as follows:

[0008] The technical solution of the present invention is realized as follows:

[0009] A double-firing biopsy gun includes an inner core needle with a cutting groove at the front end, an outer cannula needle, and a rear-end ejection device. The rear-end ejection device includes an upper shell, a lower shell, and a slider. Corresponding chutes are provided inside the upper shell and the lower shell. One end of the slider is arranged in the chute and can move along the chute. An inner core needle firing component and an outer cannula needle firing component are arranged inside the lower shell. A first button component for sequentially pressing the inner core needle firing component and the outer cannula needle firing component and a second button component for separately pressing the inner core needle firing component are arranged inside the upper shell. The slider abuts against the inner core needle firing component and the outer cannula needle firing component and can press the inner core needle and the outer cannula needle to the depressed state.

[0010] Preferably, the inner core needle firing assembly includes an inner core needle spring fixing member, an inner core needle spring, and an inner core needle fixing member. One end of the inner core needle spring fixing member is fixedly installed in a groove at the rear end of the lower housing. The inner core needle spring is installed between the inner core needle fixing member and the inner core needle spring fixing member. The rear end of the inner core needle is fixedly installed on the inner core needle fixing member. The outer tube needle firing assembly includes an outer tube needle spring fixing member, an outer tube needle spring, and an outer tube needle fixing member. One end of the outer tube needle spring fixing member is fixedly installed in a groove at the rear end of the lower housing. The outer tube needle spring is installed between the outer tube needle fixing member and the outer tube needle spring fixing member. The rear end of the outer tube needle is fixedly installed on the outer tube needle fixing member. The slider abuts against the front end of the outer tube needle fixing member, and the slider can freely abut against the inner core needle fixing member.

[0011] Preferably, the first button assembly includes a first button. The front end of the first button is connected to the upper housing. The free end of the first button has an upturned angle, and different positions of the button trigger different pressing strokes. Inner core needle elastic trigger members and outer tube needle elastic trigger members are respectively arranged on the inner core needle fixing member and the outer tube needle fixing member. In the initial state, the inner core needle elastic trigger member is located at the short stroke of the first button, and the outer tube needle fixing member is located at the long stroke of the first button. The upper housing is provided with a first limiting step and a second limiting step. First protrusions and second protrusions are respectively arranged corresponding to the inner core needle elastic trigger member and the outer tube needle elastic trigger member. The mutual engagement of the first limiting step and the first protrusion and the mutual engagement of the second limiting step and the second protrusion constitute a pressed state. The second button assembly includes a second button, and the inner core needle elastic trigger member is located at the pressing position of the second button.

[0012] Preferably, a limiting spring assembly is arranged at the front end of the slider. The limiting spring assembly includes a limiting spring and a limiting member. One end of the limiting spring is fixed on the slider, and the other end is fixedly connected to the limiting member. When the limiting spring is compressed, the limiting member abuts against the outer tube needle fixing member. When the limiting spring extends, the limiting member abuts against the inner core needle fixing member. A slider return spring is further arranged in the lower housing. One end of the slider return spring is fixedly connected to the outer tube needle fixing member, and the other end abuts against the slider.

[0013] Preferably, a slope is arranged at the abutting position of the outer tube needle fixing member and the limiting member.

[0014] Preferably, an inner core needle buffer pad and an outer tube needle buffer pad are further arranged in the lower housing. The inner core needle buffer pad is fixedly installed on the head end face of the inner core needle fixing member and touches the end face of the lower housing in the initial state. The outer tube needle buffer pad is fixedly installed on the head end face of the outer tube needle fixing member and touches the end face of the lower housing in the initial state.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] The double-firing biopsy gun of the present invention realizes an integrated design of full automation and semi-automation. For lesion tissues with sufficient safety space, one-key operation can be achieved to complete the step-by-step firing of the inner core needle and the outer tube needle. In the case where the operating safety space is insufficient, the inner core needle is first fired in place, then extended from the pre-positioned cannula needle channel, and the distance of the extended cannula needle is gradually controlled, so as to effectively control the walking displacement in the lesion area and avoid blood vessels or important organs on the forward path. The product of the present invention has a light structure, can be simultaneously matched with CT and B-ultrasound for needle insertion, and the key firing is easy without affecting the puncture accuracy. At the same time, the operation is convenient and simple. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic diagram of the lower housing and the internal structure of the double-firing biopsy gun of the present invention;

[0018] Figure 2 is Figure 1 a three-dimensional view of;

[0019] Figure 3 is an internal view of the lower housing of the present invention;

[0020] Figure 4 is a three-dimensional view of 3;

[0021] Figure 5 is a schematic diagram of the appearance of the double-firing biopsy gun of the present invention.

[0022] In the figure: inner core needle 1, outer tube needle 2 and rear end ejection device 3, upper housing 4, lower housing 5 and slider 6, chute 7, first button assembly 8, second button assembly 9, inner core needle spring fixing member 10, inner core needle spring 11 and inner core needle fixing member 12, outer tube needle spring fixing member 13, outer tube needle spring 14 and outer tube needle fixing member 15, outer tube needle elastic trigger member 16, first button 17, inner core needle elastic trigger member 18, outer tube needle elastic trigger member 19, first limit step 20, second limit step 21, first protrusion 22, second protrusion 23, second button 24, limit spring 25, limit member 26, slider return spring 27, inner core needle buffer pad 28, outer tube needle buffer pad 29. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] Next, the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention.

[0024] Such as Figures 1 to 5As shown in the figure, a double-trigger biopsy gun includes an inner core needle 1 with a cutting groove at the front end, an outer tube needle 2, and a rear-end ejection device 3. The rear-end ejection device 3 includes an upper housing 4, a lower housing 5, and a slider 6. Corresponding chutes 7 are provided inside the upper housing 4 and the lower housing 5. One end of the slider 6 is arranged in the chute 7 and can move along the chute 7. An inner core needle firing assembly and an outer tube needle firing assembly are arranged inside the lower housing 5. A first button assembly 8 for sequentially pressing the inner core needle firing assembly and the outer tube needle firing assembly and a second button assembly 9 for separately pressing the inner core needle firing assembly are arranged inside the upper housing 4. The slider 6 abuts against the inner core needle firing assembly and the outer tube needle firing assembly and can press the inner core needle 1 and the outer tube needle 2 to a depressed state. Operating the first button assembly 8 can gradually fire the inner core needle 1 and the outer tube needle 2 to achieve rapid sampling and full-automatic function. Operating the second button assembly 9 can separately fire the inner core needle 1 to achieve semi-automatic function. The inner core needle firing assembly includes an inner core needle spring fixing member 10, an inner core needle spring 11, and an inner core needle fixing member 12. One end of the inner core needle spring fixing member 10 is fixedly installed in a groove at the rear end of the lower housing 4. The inner core needle spring 11 is installed between the inner core needle fixing member 12 and the inner core needle spring fixing member 10. The rear end of the inner core needle 1 is fixedly installed on the inner core needle fixing member 12. The outer tube needle firing assembly includes an outer tube needle spring fixing member 13, an outer tube needle spring 14, and an outer tube needle fixing member 15. One end of the outer tube needle spring fixing member 13 is fixedly installed in a groove at the rear end of the lower housing 4. The outer tube needle spring 14 is installed between the outer tube needle fixing member 15 and the outer tube needle spring fixing member 13. The rear end of the outer tube needle 2 is fixedly installed on the outer tube needle fixing member 15. The slider 6 abuts against the front end of the outer tube needle fixing member 15. The slider 6 can freely abut against the inner core needle fixing member 12. When the slider 6 is pressed for the first time, the slider 6 only abuts against the front end of the outer tube needle fixing member 15 and does not abut against the inner core needle fixing member 12. When the outer tube needle 2 is pressed down to the depressed state, after the slider 6 is reset, the slider 6 abuts against the inner core needle fixing member 12.The first button assembly 8 includes a first button 17. The front end of the first button 17 is connected to the upper housing 4. The free end of the first button 17 is tilted at an angle, and different positions of the button trigger different pressing strokes. An inner core needle elastic trigger 18 and an outer tube needle elastic trigger 16 are respectively arranged on the inner core needle fixing member 12 and the outer tube needle fixing member 15. In the initial state, the inner core needle elastic trigger 18 is located at the short stroke of the first button 17, and the outer tube needle fixing member 15 is located at the long stroke of the first button 17. The upper housing 4 is provided with a first limiting step 20 and a second limiting step 21. The settings of the first limiting step 20 and the second limiting step 21 can make the inner core needle fixing member 12 and the outer tube needle fixing member 15 be stuck and limited after moving to the expected positions. A first protrusion 22 and a second protrusion 23 are respectively arranged corresponding to the inner core needle elastic trigger 18 and the outer tube needle elastic trigger 19. The mutual engagement of the first limiting step 20 and the first protrusion 22 and the mutual engagement of the second limiting step 21 and the second protrusion 23 constitute a pressing state. The second button assembly 9 includes a second button 24. The inner core needle elastic trigger 18 is located at the pressing position of the second button 24. A limiting spring assembly is arranged at the front end of the slider 6. The limiting spring assembly includes a limiting spring 25 and a limiting member 26. One end of the limiting spring 25 is fixed on the slider 6, and the other end is fixedly connected to the limiting member 26. The slider 6 abuts against the front end of the outer tube needle fixing member 15 through the limiting member 26. The slider 6 can freely abut against the inner core needle fixing member 12 through the positioning member 26. When the limiting spring 25 is compressed, the limiting member 26 abuts against the outer tube needle fixing member 15. When the limiting spring 25 extends, the 26 abuts against the inner core needle fixing member 12. A slider return spring 27 is further arranged in the lower housing 5. One end of the slider return spring 27 is fixedly connected to the outer tube needle fixing member 15, and the other end abuts against the slider 6. A slope is arranged at the abutting position of the outer tube needle fixing member 15 and the limiting member 26, and the limiting member 26 moves along the slope on the outer tube needle fixing member 15. An inner core needle buffer pad 28 and an outer tube needle buffer pad 29 are further arranged in the lower housing 5. The inner core needle buffer pad 28 is fixedly installed on the head end face of the inner core needle fixing member 12 and touches the end face of the lower housing 5 in the initial state. The outer tube needle buffer pad 29 is fixedly installed on the head end face of the outer tube needle fixing member 15 and touches the end face of the lower housing 5 in the initial state.

[0025] The operation process of the biopsy gun of the present invention:

[0026] 1) Through CT or B-ultrasound, obtain the patient's image data, find the lesion area, and plan the puncture path;

[0027] 2) In the initial state, since the outer tube needle fixing member is at the top of the upper housing, press the limiting member to the left, causing the inner core needle fixing member to disengage from the slider.

[0028] 3) Press the slider down for the first time. The slider drives the outer cannula needle fixing member to move downward together. The outer cannula needle fixing member drives the outer cannula needle to move from the surface of the inner core needle until the second protrusion on the outer cannula needle fixing member contacts the second step on the upper housing and is locked in position. At this time, the cutting groove of the inner core needle is exposed outside the outer cannula needle, and the outer cannula needle moves into place.

[0029] 4) Release the slider. Under the action of the return spring, the slider returns to its initial position.

[0030] 5) When the outer cannula needle fixing member moves to the bottom end of the lower housing, the limiting member returns to the right under the action of the limiting spring, and the limiting member abuts against the inner core needle fixing member.

[0031] 6) Press the slider down for the second time. The limiting member installed on the slider moves downward together, thereby driving the inner core needle fixing member to move downward until the first protrusion contacts the first step on the inner surface of the upper housing, so as to be positioned, and the inner core needle moves into place.

[0032] 7) Select the one-key firing mode:

[0033] 7.1) Press the first button on the surface of the upper housing. During the downward pressing process of the first button, it first contacts the first protrusion of the inner core needle fixing member and squeezes the first protrusion inward, causing the first protrusion to peel off from the first step on the inner surface of the upper housing. Thus, under the elastic action of the inner core needle spring, it moves forward, and the cutting groove at the head of the inner core needle penetrates through the tissue, and the tissue fills in the cutting groove until the washer at the head of the inner core needle fixing member contacts the housing, thereby stopping the movement.

[0034] 7.2) Continue to press the first button, and then it contacts the second protrusion of the outer cannula needle fixing member and squeezes the second protrusion inward, causing the second protrusion of the outer cannula needle fixing member to peel off from the second step on the inner surface of the upper housing. Thus, under the elastic action of the outer cannula needle spring, the outer cannula needle fixing member loses its positioning and moves forward. The outer cannula needle passes through outside the cutting groove of the inner core needle and cuts the tissue in the cutting groove of the inner core needle. At this time, the tissue is cut and stays in the cutting groove of the inner core needle until the washer at the head of the inner core needle fixing member contacts the housing, thereby stopping the movement. At this time, the sampling action of the product is completed.

[0035] 7.3) Press the slider down for the third time. Similar to step 3), the outer cannula needle is pressed down to move into place. At this time, the living tissue on the cutting groove of the inner core needle can be taken out by a tool.

[0036] 7.4) Press the first button on the surface of the upper housing. The first button contacts the second protrusion of the outer cannula needle fixing member and squeezes the second protrusion inward, causing the second protrusion of the outer cannula needle fixing member to peel off from the step on the inner surface of the upper housing. Thus, under the elastic action of the outer cannula needle spring, the outer cannula needle fixing member loses its positioning and moves forward until the washer at the head of the inner core needle fixing member contacts the housing, thereby stopping the movement, and the product returns to its initial state.

[0037] 8) Select the double-click firing mode:

[0038] 8.1) Press the second button on the surface of the upper housing. During the downward pressing of the second button, it first contacts the first protrusion of the inner core needle fixing member, squeezes the first protrusion inward, causing the first protrusion of the elastic fixing member to peel off from the first step on the inner surface of the upper housing. Thus, under the elastic action of the inner core needle spring, it moves forward, and the cutting groove at the head of the inner core needle passes through the tissue, and the tissue fills the cutting groove until the spring pad at the head of the inner core needle fixing member contacts the housing, and then the movement stops.

[0039] 8.2) Press the first button on the surface of the upper housing. The first button contacts the second protrusion of the outer cannula needle fixing member, squeezes the second protrusion inward, causing the second protrusion of the outer cannula needle fixing member to peel off from the second step on the inner surface of the upper housing. Thus, under the elastic action of the outer cannula needle spring, the outer cannula needle fixing member loses its positioning and moves forward, and the outer cannula needle passes through the outside of the cutting groove of the inner core needle, cutting the tissue in the cutting groove of the inner core needle. At this time, the tissue is cut and stays in the cutting groove of the inner core needle until the spring pad at the head of the inner core needle fixing member contacts the housing, and then the movement stops. At this time, the sampling action of the product is completed.

[0040] 8.3) Repeat the operations in 7.3) and 7.4) to complete the extraction of the living tissue strip and the return of the product to the initial state.

[0041] Based on the structure and operation process of the double-click biopsy gun of the present invention, it can be seen that the present invention realizes the design of integrating full-automatic and semi-automatic functions. For lesion tissues with sufficient safety space, one-key operation can be achieved to complete the step-by-step firing of the inner core needle and the outer cannula needle. In the case of insufficient safety space for manipulation, the inner core needle can be fired in place first, and then extended from the pre-positioned cannula needle channel, and the extension distance of the cannula needle can be gradually controlled, so as to effectively control the walking displacement in the lesion area and avoid blood vessels or important organs on the forward path. The product of the present invention has a light structure, can be matched with CT and B-ultrasound for needle insertion at the same time, and the button firing is easy, which will not affect the puncture accuracy. At the same time, the operation is convenient and simple.

Claims

1. A double-shot biopsy gun, characterized in that, It includes an inner core needle with a cutting groove at the front end, an outer tube needle and a rear end ejection device, the rear end ejection device includes an upper shell, a lower shell and a slider, the upper shell and the lower shell are correspondingly provided with slide grooves inside, one end of the slider is arranged in the slide groove and can move along the slide groove, the lower shell is provided with an inner core needle firing assembly and an outer tube needle firing assembly, the upper shell is provided with a first button assembly that can press the inner core needle firing assembly and the outer tube needle firing assembly in turn, and a second button assembly that presses the inner core needle firing assembly alone, the slider abuts against the inner core needle firing assembly and the outer tube needle firing assembly and can make the inner core needle and the outer tube needle to a pressed state; The inner core needle firing assembly comprises an inner core needle spring fixing part, an inner core needle spring and an inner core needle fixing part, one end of the inner core needle spring fixing part is fixedly installed in a groove at the rear end of the lower shell body, the inner core needle spring is installed between the inner core needle fixing part and the inner core needle spring fixing part, the rear end of the inner core needle is fixedly installed on the inner core needle fixing part, the outer tube needle firing assembly comprises an outer tube needle spring fixing part, an outer tube needle spring and an outer tube needle fixing part, one end of the outer tube needle spring fixing part is fixedly installed in a groove at the rear end of the lower shell body, the outer tube needle spring is installed between the outer tube needle fixing part and the outer tube needle spring fixing part, the rear end of the outer tube needle is fixedly installed on the outer tube needle fixing part, the slider abuts against the front end of the outer tube needle fixing part, and the slider can freely abut against the inner core needle fixing part; The first button assembly comprises a first button, the front end of which is connected to the upper shell body, the free end of the first button has a tilting angle, different positions of the button trigger different pressing strokes, the inner core needle fixing member and the outer tube needle fixing member are respectively provided with an inner core needle elastic trigger member and an outer tube needle elastic trigger member, in an initial state, the inner core needle elastic trigger member is located at the short stroke of the first button, and the outer tube needle fixing member is located at the long stroke of the first button, the upper shell body is provided with a first limiting step and a second limiting step, the inner core needle elastic trigger member and the outer tube needle elastic trigger member are respectively provided with a first protrusion and a second protrusion, the first limiting step and the first protrusion are mutually engaged, and the second limiting step and the second protrusion are mutually engaged to form a downward pressing state, the second button assembly comprises a second button, and the inner core needle elastic trigger member is located at the pressing position of the second button; A limit spring assembly is provided at the front end of the slider, and the limit spring assembly includes a limit spring and a limit part. One end of the limit spring is fixed to the slider, and the other end is fixedly connected to the limit part. When the limit spring is compressed, the limit part abuts against the outer tube needle fixing part. When the limit spring is extended, the limit part abuts against the inner core needle fixing part. A slider return spring is also provided in the lower shell body, and one end of the slider return spring is fixedly connected to the outer tube needle fixing part, and the other end abuts against the slider.

2. The double-shot biopsy gun according to claim 1, wherein, A slope is arranged at the abutment position between the outer tube needle fixing piece and the limiting piece.

3. The double-shot biopsy gun according to claim 1, characterized in that, An inner core needle buffer pad and an outer tube needle buffer pad are further arranged in the lower shell body. The inner core needle buffer pad is fixedly installed on the head end face of the inner core needle fixing member and touches the end face of the lower shell body in the initial state. The outer tube needle buffer pad is fixedly installed on the head end face of the outer tube needle fixing member and touches the end face of the lower shell body in the initial state.

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