CN113855097A

CN113855097A - Improved biopsy needle

Info

Publication number: CN113855097A
Application number: CN202111140915.9A
Authority: CN
Inventors: 黄杨淇; 黄文侨
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-09-28
Filing date: 2021-09-28
Publication date: 2021-12-31

Abstract

The invention discloses an improved biopsy needle, which comprises a needle cylinder, an outer needle, a piston rod and an inner needle, wherein the outer needle is fixedly connected to the front part of the needle cylinder; the piston rod is internally provided with a through hole arranged along the length direction, the through hole extends from the head edge of the piston rod to the tail of the piston rod, and the inner needle is arranged in the through hole in a penetrating way and is detachably and fixedly connected with the piston rod; the tip of the inner needle is receivable within the lumen of the outer needle. Compared with the prior art, the invention has the advantages that the inner needle which can be detached from the piston rod is arranged, so that when eluent is sucked in a reciprocating manner, the inner needle is prevented from influencing the smooth movement of the piston rod in the outer needle, and a histological sample and a cytological sample can be conveniently obtained by elution.

Description

Improved biopsy needle

Technical Field

The invention relates to the field of medical instruments, in particular to an improved biopsy needle.

Background

The biopsy needle is a medical appliance, is suitable for kidney, liver, lung, mammary gland, thyroid gland, prostate, pancreas, testis, uterus, ovary, body surface and other organs, and can be used for biopsy sampling and cell suction of cone tumor, unknown tumor and the like. Clinically, when examining a patient with a tumor, a biopsy needle is used to take a biopsy from the affected part to examine the tumor. The biopsy is classified into cytological biopsy and histological biopsy according to the examined sample. The cytological examination refers to observation of pathological morphology and qualitative diagnosis of cells extracted by puncture, and is mainly applied to diagnosis of tumors. Histological biopsy is performed by taking out a tissue at a puncture site with a biopsy needle and performing a pathological examination to confirm whether or not cancer has occurred.

The structure of the adopted negative pressure biopsy needle comprises a needle cylinder, an outer needle, an inner needle and a piston rod, wherein the inner needle is fixedly connected in the piston rod, during puncture, the inner needle fills an inner cavity of the outer needle so as to prevent non-target tissues from being accommodated in the outer needle during puncture, after the piston rod reaches a puncture part, the piston rod moves backwards to form negative pressure, the inner needle also moves backwards at the moment, a doctor drives the biopsy needle to carry out lifting and inserting actions, tissues at the target part can enter the outer needle under the action of the negative pressure, the biopsy needle is pulled out of a body, the piston rod is pushed forwards to eject the taken tissues out, and next-step histological examination is carried out. If the cytological examination is to be carried out on the residual cells in the inner cavity of the outer needle, the outer wall of the inner needle and the inner cavity of the needle cylinder, the needle head of the outer needle needs to be accommodated in eluent, the residual cells are eluted through the reciprocating push-pull piston rod, but at the moment, because the inner needle is always accommodated in the outer needle, the gap between the inner needle and the outer needle of the forward push piston rod is extremely small, when the piston rod is pushed forwards, liquid or gas in the needle cylinder cannot be smoothly discharged, the piston rod is not smoothly moved, the resistance of the reciprocating push-pull piston rod is very large, and the operation is not convenient.

In view of the above, the applicant has made an intensive study on the above-mentioned defects in the prior art, and has made this invention.

Disclosure of Invention

The invention mainly aims to provide an improved biopsy needle which has the characteristic of convenient cytological detection after biopsy tissues are taken out and is convenient for elution operation.

In order to achieve the above purpose, the solution of the invention is:

an improved biopsy needle comprises a needle cylinder, an outer needle, a piston rod and an inner needle, wherein the outer needle is fixedly connected to the front part of the needle cylinder, the front part of the piston rod is arranged in the needle cylinder and can slide along the length direction of the needle cylinder, and the front part of the piston rod is provided with a rubber sleeve hermetically connected with the inner wall of the needle cylinder; the piston rod is internally provided with a through hole arranged along the length direction, the through hole extends from the head edge of the piston rod to the tail of the piston rod, and the inner needle is arranged in the through hole in a penetrating way and is detachably and fixedly connected with the piston rod; the tip of the inner needle is receivable within the lumen of the outer needle.

Further, the inner needle tail part is fixedly connected with a fixed seat, and the fixed seat and the through hole are detachably and fixedly connected at the through hole opening at the tail part of the piston rod.

Further, when the inner needle is fixedly connected to the piston rod, the inner needle penetrates through the rubber sleeve, and the rubber sleeve abuts against and seals the outer side wall of the inner needle.

Furthermore, the needle seat of the outer needle is detachably and fixedly connected with the front part of the needle cylinder.

Furthermore, the piston rod is provided with a clamping strip, the clamping strip is provided with limiting teeth, and when negative pressure is formed in the needle cylinder, the limiting teeth abut against the needle cylinder to limit rebound of the piston rod.

Furthermore, the tail part of the piston rod is also provided with a plugging piece for plugging the through hole after the inner needle is taken down.

Further, a spring is sleeved on the side wall of the outer side of the piston rod, a limiting part is further arranged on the piston rod, a strip-shaped groove is formed in the needle cylinder, the length direction of the strip-shaped groove is parallel to the moving direction of the piston rod, and the limiting part is arranged in the strip-shaped groove in a sliding mode along with the movement of the piston rod; a locking switch is also arranged between the needle cylinder and the piston rod; the piston rod is provided with an initial position and a negative pressure position, and when the piston rod is at the initial position, the piston rod is fixedly connected with the needle cylinder through the locking switch; after the locking switch is triggered and released, the spring drives the piston rod to move to the rear side from the initial position to a negative pressure position so as to form negative pressure in the needle cylinder.

Further, the needle cylinder comprises a first outer wall section and a second outer wall section, the second outer wall section is arranged on the side, away from the outer needle, of the first outer wall section, the rubber sleeve of the piston rod is connected to the first outer wall section in a sliding mode, and the inner diameter of the second outer wall section is larger than the outer diameter of the first outer wall section; the spring is a compression spring, the compression spring is accommodated in the second outer wall section, and two ends of the compression spring are respectively abutted against the piston rod.

Furthermore, the locking switch comprises a connecting strip arranged on the piston rod, and a clamping block is formed on the connecting strip; the locking switch also comprises a trigger mechanism, and when the piston rod is at the initial position, the piston rod is connected with the side wall of the needle cylinder through a fixture block; the trigger mechanism is arranged on the outer wall of the needle cylinder, and the clamping block can be separated from the needle cylinder by pressing the trigger mechanism. Further, spacing portion is the gag lever post of fixed setting on the piston rod, the bar groove is for forming the bar logical groove on the cylinder, spacing portion wears to establish the bar inslot.

After the structure is adopted, the improved biopsy needle provided by the invention has at least the following beneficial effects:

firstly, after the biopsy needle is taken out of a patient body, the taken tissue in the outer needle is ejected out by pushing the piston rod and the inner needle forwards together; because the inner needle with the piston rod is for can dismantling the connection, the inner needle can be followed the piston rod and separated or with the inner needle backward movement until inner needle and outer needle separation, and when the needle point of outer needle was located the eluant like this, the piston rod can smoothly aspirate the eluant to shift outer needle inner wall or the cell that is located the cylinder to the eluant in, make things convenient for follow-up cytology inspection.

The rubber sleeve abuts against and is sealed on the outer side wall of the inner needle, so that when the inner needle penetrates through the rubber sleeve, the rubber sleeve can be sealed with the inner needle, and the sealing effect of the inner cavity of the needle cylinder is ensured; after the inner needle is separated from the rubber sleeve, the rubber sleeve can be closed under the action of self elasticity due to the small diameter of the inner needle, and the sealing effect is also ensured. And when the inner needle is drawn out, the rubber sleeve which is sealed on the outer wall of the inner needle is propped against the inner needle to scrape down the histiocyte attached to the outer wall of the inner needle to a certain extent, thereby being beneficial to sample collection of cytological examination.

And thirdly, if the inner needle is completely drawn out, the sealing performance in the needle cylinder can be ensured by adopting a mode that the sealing piece seals the through hole at the tail part of the piston rod, so that the suction operation of eluent can be completed.

Fourthly, after the outer needle of the puncture needle is punctured in place, the doctor drives the piston rod to move backwards, negative pressure is formed inside the needle cylinder, the limiting teeth are abutted against the needle cylinder, and the negative pressure is still kept after the hand is loosened.

And fifthly, a spring and a limiting part are arranged on the outer side of the piston rod, after the outer needle of the puncture needle is punctured in place, the doctor unlocks the locking switch, and the spring drives the piston rod to move backwards, so that negative pressure is formed inside the needle cylinder. Thus, the operation can be realized through the action of the spring without the operation of two hands of a doctor. When the eluent is sucked in a reciprocating way subsequently, the stroke of the doctor for driving the piston rod to move is smaller than the stroke of the piston rod from the initial position to the negative pressure position, so that the piston rod cannot be locked again.

And sixthly, the spring can be more conveniently installed by arranging the second outer wall section with the inner diameter larger than that of the first outer wall section.

Compared with the prior art, the invention has the advantages that the inner needle which can be detached from the piston rod is arranged, so that when eluent is sucked in a reciprocating manner, the inner needle is prevented from influencing the smooth movement of the piston rod in the outer needle, and a histological sample and a cytological sample can be conveniently obtained by elution.

Drawings

FIG. 1 is a schematic cross-sectional view of an improved biopsy needle according to the present invention.

Fig. 2 is a schematic cross-sectional view of the present invention with the piston rod in the negative pressure position.

Fig. 3 is a schematic perspective view of the present invention.

Fig. 4 is an exploded view of the present invention.

Fig. 5 and 6 are schematic views of the structure of the present invention with a spring when the piston rod is in different positions.

Fig. 7 is an enlarged schematic view of a portion a in fig. 6.

FIG. 8 is a schematic view of a partial structure of the present invention when the axis of the limiting rod and the axis of the through hole are arranged in a different plane.

Fig. 9 is a partially enlarged structural view of the outer needle and the inner needle.

In the figure:

a needle cylinder 1; a nipple seat 11; a helical groove 12; a strip-shaped groove 13; a first outer wall section 14; a second outer wall section 15;

an outer needle 2; a needle holder 21; a connecting seat 22; a tip portion 23;

a piston rod 3; a rubber sleeve 31; a through hole 32; a clip strip 33; a limit tooth 331; a stopper portion 34; a compression spring 35;

an inner needle 4; a fixed base 41; a diamond-shaped surface 42;

a lock-up switch 5; a connecting strip 51; a latch 52; a rotating base 53; the rotating rod 54; a hook 541; a return spring 55; a limiting hole 56.

Detailed Description

In order to further explain the technical solution of the present invention, the present invention is explained in detail by the following specific examples.

As shown in fig. 1 to 9, which are improved biopsy needles according to the present invention, the biopsy needle includes a needle cylinder 1, an outer needle 2, a piston rod 3 and an inner needle 4, the outer needle 2 is fixedly connected to a front portion of the needle cylinder 1, a front portion of the piston rod 3 is disposed inside the needle cylinder 1 and can slide along a length direction of the needle cylinder 1, and a rubber sleeve 31 sealingly connected to an inner wall of the needle cylinder 1 is disposed at a front portion of the piston rod 3; a through hole 32 arranged along the length direction is arranged in the piston rod 3, the through hole 32 extends from the head edge of the piston rod 3 to the tail of the piston rod 3, and the inner needle 4 is arranged in the through hole 32 in a penetrating manner and is detachably and fixedly connected with the piston rod 3; the tip of the inner needle 4 can be accommodated within the lumen of the outer needle 2.

Thus, the present invention relates to an improved biopsy needle, which ejects the tissue taken out from the outer needle 2 by pushing the piston rod 3 and the inner needle 4 together forward after the biopsy needle is taken out from the patient; because interior needle 4 with piston rod 3 is for dismantling the connection, interior needle 4 can follow piston rod 3 and separate or with interior needle 4 backward movement until interior needle 4 and outer needle 2 separation (promptly interior needle 4 still partly is connected with piston rod 3, but when piston rod 3 reciprocated suction eluent, the anterior of interior needle 4 all can not be located outer needle 2), when the needle point of outer needle 2 was located the eluent like this, piston rod 3 can smoothly aspirate the eluent to shift outer needle 2 inner wall or the cell that is located cylinder 1 to the eluent, make things convenient for follow-up cytology inspection.

Preferably, the tail part of the inner needle 4 is fixedly connected with a fixed seat 41, and the fixed seat 41 is detachably and fixedly connected with the through hole 32 at the opening of the through hole 32 at the tail part of the piston rod. The fixing seat 41 plays a role in stably connecting the inner needle 4 with the fixing seat 41, and simultaneously, an operator can conveniently drive the inner needle 4 backwards. The fixed seat 41 can also be connected with the through hole 32 in a sealing way, so that the sealing property in the needle cylinder 1 is further ensured. The fixing seat 41 can be detachably connected with the through hole by adopting a threaded connection or clamping connection and the like.

Preferably, when the inner needle 4 is fixedly connected to the piston rod 3, the inner needle 4 passes through the rubber sleeve 31, and the rubber sleeve 31 abuts against and seals the outer side wall of the inner needle 4. The rubber sleeve 31 abuts against and is sealed on the outer side wall of the inner needle 4, so that when the inner needle 4 penetrates through the rubber sleeve 31, the rubber sleeve 31 can be sealed with the inner needle 4, and the sealing effect of the inner cavity of the needle cylinder 1 is ensured; after the inner needle 4 is separated from the rubber sleeve 31, the rubber sleeve 31 can be closed under the action of self elasticity due to the small diameter of the inner needle 4, and the sealing effect is also ensured. And when the inner needle 4 is drawn out, the rubber sleeve 31 which is sealed on the outer wall of the inner needle 4 in a propping manner can scrape off the tissue cells attached to the outer wall of the inner needle 4 to a certain extent, which is beneficial to sample collection of cytological examination.

Preferably, the needle seat 21 of the outer needle 2 is detachably and fixedly connected with the front part of the needle cylinder 1. Thus, the needle cylinder 1 can be suitable for the outer needles 2 with different specifications and is convenient to replace. Furthermore, the outer wall of the needle seat 21 of the outer needle 2 is provided with connecting seats 22 which are uniformly arranged at intervals in an annular shape, the front part of the needle cylinder 1 is provided with spiral grooves 12 which are the same with the connecting seats 22 in number, and after the needle seat 21 is connected with the nipple seat 11 of the needle cylinder 1, the connecting seats 22 are connected in the spiral grooves 12.

Furthermore, the inner wall of the outer needle 2 is provided with a spiral strip (not shown in the figure), so that the tissue can be conveniently and firmly grabbed. As shown in fig. 9, the three tips 23 of the needle tip of the outer needle 2 are easy to be broken after taking out the tissue, and the needle tip of the inner needle 4 is provided with a plurality of rhombic surfaces 42, so that the skin-breaking needle insertion is convenient.

Preferably, the piston rod 3 is provided with a clamping strip 33, the clamping strip 33 is provided with a limiting tooth 331, and when negative pressure is formed in the needle cylinder 1, the limiting tooth 331 abuts against the needle cylinder 1 to limit the rebound of the piston rod 3. After the outer needle 2 of the puncture needle is punctured in place, the doctor drives the piston rod 3 to move backwards, negative pressure is formed inside the needle cylinder 1, the limiting teeth 331 are abutted against the rear end of the needle cylinder 1, and the negative pressure is still kept after hands are released. The clamping strip 33 adopts a broken line design, so that the bending part of the clamping strip 33 can be abutted against the piston rod 3, the limiting teeth 331 have a trend of being outward along the radial direction, and the limiting teeth 331 are conveniently abutted against the needle cylinder 1.

Preferably, the tail part of the piston rod 3 is further provided with a plugging piece (not shown in the figure) for plugging the through hole 32 after the inner needle 4 is removed. If the inner needle 4 is completely drawn out, the sealing performance inside the needle cylinder 1 can be ensured by adopting a mode that the sealing piece seals the through hole 32 at the tail part of the piston rod 3, so as to complete the suction operation of eluent.

As shown in fig. 5 to 7, preferably, a spring is sleeved on the outer side wall of the piston rod 3, the piston rod 3 is further provided with a limiting portion 34, the needle cylinder 1 is provided with a strip-shaped groove 13, the length direction of the strip-shaped groove 13 is parallel to the moving direction of the piston rod 3, and the limiting portion 34 is slidably disposed in the strip-shaped groove 13 along with the movement of the piston rod 3; a locking switch 5 is also arranged between the needle cylinder 1 and the piston rod 3; the piston rod 3 has an initial position and a negative pressure position, and when the piston rod 3 is at the initial position, the piston rod 3 is fixedly connected with the needle cylinder 1 through the locking switch 5; after the locking switch 5 is triggered and released, the spring-driven piston rod 3 has an initial position and moves to a negative pressure position towards the rear side, so as to form negative pressure in the syringe 1.

The spring and the limiting part 34 are arranged on the outer side of the piston rod 3, after the outer needle 2 of the puncture needle is punctured in place, a doctor unlocks the locking switch 5, and the spring drives the piston rod 3 to move backwards, so that negative pressure is formed inside the needle cylinder 1. Thus, the operation can be realized through the action of the spring without the operation of two hands of a doctor. When the eluent is pumped back and forth subsequently, the stroke of the movement of the piston rod 3 driven by the doctor is smaller than the stroke of the movement of the piston rod 3 from the initial position to the negative pressure position, so that the piston rod 3 can not be locked again. So the doctor can press 3 tails of piston rod with one hand, unclamp the back, and piston rod 3 kick-backs under the spring action, so reciprocal, it is very convenient to operate.

Preferably, the needle cylinder 1 comprises a first outer wall section 14 and a second outer wall section 15, the second outer wall section 15 is arranged on the side of the first outer wall section 14 away from the outer needle 2, the rubber sleeve 31 of the piston rod 3 is slidably connected to the first outer wall section 14, and the inner diameter of the second outer wall section 15 is larger than the outer diameter of the first outer wall section 14; as shown in fig. 5 to 8, the spring is a compression spring 35, the compression spring 35 is accommodated in the second outer wall section 15, and two ends of the compression spring 35 respectively abut against the piston rod 3. By providing the second outer wall section 15 with a larger inner diameter than the first outer wall section 14, the spring can be more easily mounted. The spring can be a compression spring 35 or a tension spring, and the installation structures of the piston rod 3 and the spring on the needle cylinder 1 are designed according to different installation modes of the spring.

Preferably, the locking switch 5 comprises a connecting strip 51 arranged on the piston rod 3, and a latch 52 is formed on the connecting strip 51; the locking switch 5 further comprises a triggering mechanism, and when the piston rod 3 is at the initial position, the piston rod 3 is connected with the side wall of the needle cylinder 1 through a fixture block 52; the trigger mechanism is arranged on the outer wall of the needle cylinder 1, and the fixture block 52 can be separated from the needle cylinder 1 by pressing the trigger mechanism. The structure of the locking switch 5 of the present invention is not limited to the above structure, and other structures capable of locking and releasing two parts which are sleeved with each other under the action of a spring can be applied to the present invention on the premise of ensuring the strength smoothness. Trigger mechanism is including rotating seat 53 and dwang 54, be provided with spacing hole 56 on the outer wall of cylinder 1, dwang 54 middle part is rotated and is connected on rotating seat 53, dwang 54 front end is provided with couple 541, couple 541 is located spacing hole 56 and can catches on fixture block 52, be provided with reset spring 55 between dwang 54 rear end and the 1 outer wall of cylinder.

Preferably, the limiting part 34 is a limiting rod fixedly arranged on the piston rod 3, the strip-shaped groove 13 is a strip-shaped through groove formed on the needle cylinder 1, and the limiting part 34 is arranged in the strip-shaped groove 13 in a penetrating manner. When the limiting rod is designed, the position of the through hole 32 inside the limiting rod needs to be avoided, if the limiting rod is arranged on one side or two sides of the piston rod 3, the limiting rod is not arranged at the position of the through hole 32. As shown in fig. 8, the axis of the stopper rod may be disposed opposite to the axis of the through hole 32, so that the stopper rod may not interfere with the through hole 32 even if disposed through the through hole.

Compared with the prior art, the invention has the advantages that the inner needle 4 which can be detached from the piston rod 3 is arranged, so that when eluent is sucked in a reciprocating manner, the inner needle 4 is prevented from influencing the smooth movement of the piston rod 3 in the outer needle 2, and a histological sample can be obtained and a cytological sample can be conveniently obtained through elution.

The above embodiments and drawings are not intended to limit the form and style of the present invention, and any suitable changes or modifications thereof by those skilled in the art should be considered as not departing from the scope of the present invention.

Claims

1. An improved biopsy needle is characterized by comprising a needle cylinder, an outer needle, a piston rod and an inner needle, wherein the outer needle is fixedly connected to the front part of the needle cylinder, the front part of the piston rod is arranged in the needle cylinder and can slide along the length direction of the needle cylinder, and the front part of the piston rod is provided with a rubber sleeve hermetically connected with the inner wall of the needle cylinder; the piston rod is internally provided with a through hole arranged along the length direction, the through hole extends from the head edge of the piston rod to the tail of the piston rod, and the inner needle is arranged in the through hole in a penetrating way and is detachably and fixedly connected with the piston rod; the tip of the inner needle is receivable within the lumen of the outer needle.

2. An improved biopsy needle as claimed in claim 1, wherein the rear portion of the inner needle is fixedly connected with a fixing seat, and the fixing seat is detachably and fixedly connected with the through hole at the through hole opening of the rear portion of the piston rod.

3. An improved biopsy needle as claimed in claim 1, wherein said inner needle passes through said rubber sleeve when said inner needle is fixedly attached to said plunger rod, said rubber sleeve being sealed against an outer sidewall of said inner needle.

4. An improved biopsy needle as claimed in claim 1, wherein said outer needle hub is removably and fixedly connected to said forward portion of said barrel.

5. An improved biopsy needle as claimed in claim 1, wherein the piston rod is provided with a clamping strip, the clamping strip is provided with a limiting tooth, and when negative pressure is formed in the needle cylinder, the limiting tooth abuts against the needle cylinder to limit rebound of the piston rod.

6. An improved biopsy needle as claimed in claim 1, wherein the tail part of the piston rod is further provided with a blocking member for blocking the through hole after the inner needle is removed.

7. An improved biopsy needle as claimed in claim 1, wherein a spring is sleeved on the outer side wall of the piston rod, a limiting part is further provided on the piston rod, a strip-shaped groove is provided on the needle cylinder, the length direction of the strip-shaped groove is parallel to the moving direction of the piston rod, and the limiting part is slidably provided in the strip-shaped groove along with the movement of the piston rod; a locking switch is also arranged between the needle cylinder and the piston rod; the piston rod is provided with an initial position and a negative pressure position, and when the piston rod is at the initial position, the piston rod is fixedly connected with the needle cylinder through the locking switch; after the locking switch is triggered and released, the spring drives the piston rod to move to the rear side from the initial position to a negative pressure position so as to form negative pressure in the needle cylinder.

8. An improved biopsy needle as claimed in claim 7, wherein said needle cylinder comprises a first outer wall section and a second outer wall section, said second outer wall section is disposed on a side of said first outer wall section remote from said outer needle, said rubber sleeve of said piston rod is slidably connected to said first outer wall section, and an inner diameter of said second outer wall section is larger than an outer diameter of said first outer wall section; the spring is a compression spring, the compression spring is accommodated in the second outer wall section, and two ends of the compression spring are respectively abutted against the piston rod.

9. The improved biopsy needle of claim 7, wherein the locking switch comprises a connecting strip disposed on the piston rod, the connecting strip having a latch formed thereon; the locking switch also comprises a trigger mechanism, and when the piston rod is at the initial position, the piston rod is connected with the side wall of the needle cylinder through a fixture block; the trigger mechanism is arranged on the outer wall of the needle cylinder, and the clamping block can be separated from the needle cylinder by pressing the trigger mechanism.

10. An improved biopsy needle as claimed in claim 7, wherein said limiting part is a limiting rod fixedly disposed on the piston rod, said strip-shaped groove is a strip-shaped through groove formed on the needle cylinder, and said limiting part is inserted into said strip-shaped groove.