CN211409333U - Adjustable cryoablation needle - Google Patents
Adjustable cryoablation needle Download PDFInfo
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- CN211409333U CN211409333U CN201921304879.3U CN201921304879U CN211409333U CN 211409333 U CN211409333 U CN 211409333U CN 201921304879 U CN201921304879 U CN 201921304879U CN 211409333 U CN211409333 U CN 211409333U
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Abstract
The utility model provides an adjustable cryoablation needle, include: the needle rod, the front section heat insulation pipe and the rear section heat insulation pipe; the needle bar can move relative to the rear section heat insulation pipe along the axial direction of the rear section heat insulation pipe so as to adjust the axial distance between the front end of the rear section heat insulation pipe and the front end of the needle bar; the front section of the heat insulation pipe can move relative to the rear section of the heat insulation pipe along the axial direction of the rear section of the heat insulation pipe synchronously with the needle rod, so that the length of the target area of the adjustable cryoablation needle is kept unchanged; the utility model discloses can avoid the doctor to select the cryoablation needle model and the unchangeable that brings, also can fully adapt to different depth of penetration, be convenient for make the length of exposing needle bar part outside as far as possible short, avoid the needle bar crooked to and lead to the fact damage such as tearing dangerous to human tissue.
Description
Technical Field
The utility model relates to the field of medical equipment, especially, relate to an adjustable cryoablation needle.
Background
The existing cryoablation needle is usually provided with two types of short and long needle rod lengths, the needle rod length determines the depth of a needle tip inserted into a human body, if a tumor position is shallow and the needle insertion direction is safe and unimpeded, the cryoablation needle of the short needle rod can be selected to be inserted into the tumor for cryoablation treatment, and if the tumor position is deep (for example, due to obesity of a patient) or the shallow side cannot be inserted into the needle and the needle needs to be inserted from the deep side, the cryoablation needle of the long needle rod can be selected.
In the cryoablation operation, after a needle rod is inserted into a human body, the needle rod is in the safest state of being completely inserted into the human body, however, no matter a long or short cryoablation needle is selected, a section of the needle rod is always exposed out of the human body, when the length of the exposed needle rod is longer than that of the human body, the needle rod can be bent due to the self gravity or other pulling forces of the cryoablation needle, the cold quantity at the position of a vacuum heat insulation pipe can be leaked due to the bending, unnecessary pulling can be caused to the human tissue, and in severe cases, the tissue can be torn or the needle rod can be broken. The longer the needle rod is exposed, the larger the moment relative to the human body, and the higher the danger coefficient.
It can be seen that in the related art, the cryoablation needle with a fixed length needle shaft is difficult to satisfy various treatment requirements, and is liable to form an exposed needle shaft portion during an operation, thereby causing bending of the needle shaft or risk of injury to a human body.
SUMMERY OF THE UTILITY MODEL
The utility model provides an adjustable cryoablation needle to solve the cryoablation needle that needle bar length is fixed and be difficult to satisfy manifold treatment demand, and easily form the needle bar part that exposes outside at the operation in-process, thereby lead to the needle bar crooked or cause the dangerous problem of damage to the human body.
According to a first aspect of the present invention, there is provided an adjustable cryoablation needle, comprising: the needle rod, the front section heat insulation pipe and the rear section heat insulation pipe; the front section heat insulation pipe is inserted into the needle rod from the rear end of the needle rod, and the front section heat insulation pipe is inserted into the rear section heat insulation pipe from the front end of the rear section heat insulation pipe;
the needle bar can move relative to the rear section heat insulation pipe along the axial direction of the rear section heat insulation pipe so as to adjust the axial distance between the front end of the rear section heat insulation pipe and the front end of the needle bar; the front section of the heat insulation pipe can move relative to the rear section of the heat insulation pipe along the axial direction of the rear section of the heat insulation pipe synchronously with the needle rod, so that the length of the target area of the adjustable cryoablation needle is kept unchanged;
wherein the length of the effective shaft section of the adjustable cryoablation needle is a function of the axial distance between the front end of the rear insulated tube and the front end of the shaft.
Optionally, the adjustable cryoablation needle further comprises a needle rod adjusting structure for driving the needle rod to move relative to the rear-section heat-insulating pipe along the axial direction of the rear-section heat-insulating pipe, and the needle rod adjusting structure is fixedly connected to the outer side of the needle rod.
Optionally, the adjustable cryoablation needle further comprises a handle;
the needle rod is inserted into the handle from the front end of the handle, and the rear-section heat-insulating pipe is arranged in the handle and is relatively fixed with the handle; the length of the effective needle bar section is the axial distance between the front end of the handle and the front end of the needle bar; the pipe wall of the handle is provided with a needle rod adjusting groove along the axial direction, and the needle rod adjusting structure penetrates through the needle rod adjusting groove and can move along the needle rod adjusting groove.
Optionally, the needle bar adjusting structure comprises a needle bar sliding block fixedly connected with the needle bar and a needle bar targeting area shifting lever connected with the needle bar sliding block part, and the needle bar targeting area shifting lever is positioned outside the needle bar adjusting groove.
Optionally, the adjustable cryoablation needle further includes an air inlet structure, the air inlet structure includes a first air inlet pipe and a second air inlet pipe in a spring shape, a front end of the first air inlet pipe extends to the needle bar, a position of the first air inlet pipe is fixed relative to the needle bar, a rear end of the first air inlet pipe is connected to a front end of the second air inlet pipe, a rear end of the second air inlet pipe is directly or indirectly connected to an air inlet channel, a position of the air inlet channel is fixed relative to the rear-section heat insulation pipe, and the second air inlet pipe can be compressed and stretched along the axial direction.
Optionally, the air inlet structure further includes a finned tube and a mandrel, the finned tube is wound around the mandrel, the front end of the finned tube is connected to the rear end of the second air inlet pipe, the rear end of the finned tube is directly or indirectly connected to the air inlet channel, and the mandrel is fixed in position relative to the rear-section heat insulation pipe.
Optionally, when the length of the effective needle rod section is the minimum value, the second air inlet pipe is in a natural state of not being stretched.
Optionally, the material of the second air inlet pipe is any one of the following materials: stainless steel, spring steel and memory metal material.
Optionally, the air inlet structure further comprises a mandrel, the second air inlet pipe is wound around the mandrel, and the position of the mandrel is fixed relative to the rear-section heat insulation pipe.
Optionally, the surface of the second air inlet pipe is provided with heat exchange fins.
Optionally, the adjustable cryoablation needle further comprises a needle rod sealing assembly located at the rear end of the needle rod, and the needle rod sealing assembly is used for sealing a gap between the inner wall of the needle rod and the outer wall of the front-section heat insulation pipe.
Optionally, the adjustable cryoablation needle further comprises a rear insulation tube sealing assembly located at the front end of the rear insulation tube; the rear section heat insulation sealing assembly is used for sealing a gap on the inner side of the inner wall of the rear section heat insulation pipe.
Optionally, the front-section heat insulation pipe includes a front-section inner pipe and a front-section outer pipe, a front-section vacuum interlayer is formed between the front-section inner pipe and the front-section outer pipe, the front end of the front-section inner pipe is connected to the front end of the front-section outer pipe, and the rear end of the front-section inner pipe is connected to the rear end of the front-section outer pipe.
Optionally, the rear end of the front-section inner pipe is connected with the rear end of the front-section outer pipe through a thermal insulation pipe gasket, and the rear end of the thermal insulation pipe gasket is provided with a tapered inner hole.
Optionally, the front-section heat insulation pipe is provided with a first pipe section, a connecting pipe section and a second pipe section along the axial direction, the rear end of the first pipe section is connected with the front end of the connecting pipe section, the rear end of the connecting pipe section is connected with the front end of the second pipe section, the inner diameter of the second pipe section is larger than the inner diameter of the first pipe section, and the outer diameter of the second pipe section is larger than the outer diameter of the first pipe section.
Optionally, the rear-section heat insulation pipe includes a rear-section inner pipe and a rear-section outer pipe, a rear-section vacuum interlayer is formed between the rear-section inner pipe and the rear-section outer pipe, the front end of the rear-section inner pipe is connected to the front end of the rear-section outer pipe, and the rear end of the rear-section inner pipe is connected to the rear end of the rear-section outer pipe.
The utility model provides an among the adjustable cryoablation needle, because the adiabatic tub front end of back end with axial distance between the needle bar front end is the adjustable, just the length of the effective needle bar section of adjustable cryoablation needle is along with this axial distance change, and it can be so that the length of the effective needle bar section that can be used for the needle insertion in the adjustable cryoablation needle can be variable, and then, the utility model discloses can freely change this length according to the treatment demand of difference to satisfy diversified treatment demand. Therefore, the utility model discloses can avoid the doctor to select adjustable cryoablation needle model and the unchangeable that brings, also can fully adapt to different depth of penetration, be convenient for make the length of exposing the needle bar part outside as far as possible short, avoid the needle bar crooked to and lead to the fact injury dangers such as tearing to human tissue.
And simultaneously, the utility model discloses in along with the length change of effective needle pole section, the length in target district can be unchangeable, has avoided target district length to follow the change of effective needle pole section and synchronous variation, corresponding, the utility model discloses the puck size that forms can be definite, and then, can satisfy the treatment demand of the similar tumour of size under the different depth of needle of insertion to be convenient for compromise the depth of needle and tumour size simultaneously, also can be at the in-process of treating the tumour, guarantee target district can not change, avoids because of the damage hidden danger that the change in target district caused in the treatment process.
Furthermore, the utility model discloses an adiabatic pipe of anterior segment and the adiabatic pipe of back end can realize the adiabatic district of a variable length, and in this adiabatic district, the rear end that can ensure the adiabatic district is in required position all the time, and then makes the adiabatic district of guarantee to cover required adiabatic position all the time, and can not be difficult to keep covering because of the removal of adiabatic pipe.
The utility model discloses both realize adjusting in the alternative, can make the position relatively fixed between needle bar and the first intake pipe again, through the relatively fixed of needle bar and first intake pipe position, can avoid the distance of first intake pipe front end and needle point too big, and then can avoid consequently and make the puck can't cover the needle point completely, prevent to internal organs, vascular puncture risk. Meanwhile, the needle rod can be prevented from being ejected by high-pressure gas, and the safety is further improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
Fig. 1a is a schematic view of an adjustable cryoablation needle according to an embodiment of the present invention;
fig. 1b is a schematic view of an adjustable cryoablation needle according to an embodiment of the present invention;
fig. 2 is a schematic view of an embodiment of the present invention illustrating an adjustable cryoablation needle;
fig. 3 is a schematic end view of the needle bar and the needle bar adjustment structure according to an embodiment of the present invention;
FIG. 4 is a schematic cross-sectional view A-A of FIG. 3;
fig. 5 is a schematic view of an adjustable position of an adjustable cryoablation needle according to an embodiment of the present invention;
fig. 6 is a schematic view of another position adjustment of an adjustable cryoablation needle in accordance with an embodiment of the present invention;
fig. 7 is a schematic view in partial cross-section of an adjustable cryoablation needle in accordance with an embodiment of the present invention;
fig. 8 is a schematic view of a second partial cross-section of an adjustable cryoablation needle in accordance with an embodiment of the present invention;
fig. 9 is a schematic structural view of a front-stage heat-insulating pipe according to an embodiment of the present invention.
Description of reference numerals:
1-front section heat insulation pipe;
101-a front section outer tube;
102-a front section inner tube;
103-insulating tube gasket;
104-a first pipe section;
105-a second pipe section;
106-connecting the pipe section;
2-rear section heat insulation pipe;
201-rear section outer tube;
202-rear section inner tube;
3-needle bar;
301-a needle tip;
4-an effective needle bar section;
5-a targeting region;
6-adiabatic region;
7-an air intake structure;
701-a first air inlet pipe;
702-a second intake pipe;
703-an intake passage;
704-finned tubes;
705-mandrel;
706-orifice;
8-air return structure;
9-rear insulated pipe seal assembly;
901-rear heat insulation pipe sealing ring;
902-front retainer ring of rear heat insulation pipe;
903-rear heat insulation pipe rear retainer ring;
10-needle bar adjusting structure;
1001-needle bar slider;
1002-needle bar deflector rod;
1003-target zone conditioning tank;
1004-front stop;
1005-a rear limit part;
11-a handle;
1101-needle bar adjustment groove.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
The terms "first," "second," "third," "fourth," and the like in the description and in the claims, as well as in the drawings, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The technical solution of the present invention will be described in detail with specific examples. The following several specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated in some embodiments.
Fig. 1a is a schematic view of an adjustable cryoablation needle according to an embodiment of the present invention; fig. 1b is a schematic view of an adjustable cryoablation needle according to an embodiment of the present invention; fig. 2 is a schematic diagram of an adjustable cryoablation needle according to an embodiment of the present invention.
Referring to fig. 1a and 1b, an adjustable cryoablation needle includes: a needle bar 3, a front section heat insulation pipe 1 and a rear section heat insulation pipe 2; the front-stage heat-insulating pipe 1 is inserted into the needle bar 3 from the rear end of the needle bar 3, and the front-stage heat-insulating pipe 1 is also inserted into the rear-stage heat-insulating pipe 2 from the front end of the rear-stage heat-insulating pipe 2. After assembly, the needle bar 3, the front-stage heat insulating pipe 1, and the rear-stage heat insulating pipe 2 have the same axial direction.
From the above description, it is understood that the positions and the fitting relationship among the front-stage heat-insulating pipe 1, the rear-stage heat-insulating pipe 2, and the needle bar 3 are not deviated from the description of the present embodiment based on the relationship, and any shape change and any structure addition are not deviated from the description of the present embodiment.
In the embodiment, a variable-length adiabatic region can be realized by the front-stage adiabatic tube and the rear-stage adiabatic tube, and in the adiabatic region, the rear end of the adiabatic region can be ensured to be always in a required position, so that the adiabatic region can be ensured to always cover the required adiabatic position without being difficult to keep covering due to the movement of the adiabatic tube, for example, at least part of the structure (further, for example, the second air inlet pipe) of the air inlet structure can be always in the adiabatic region. That is, only when the length of the adiabatic region needs to be changed, thereby considering both the coverage of the adiabatic region and the length of the target region, the two sections of the adiabatic tube need to be generated.
In this embodiment, the needle bar 3 can move along the axial direction of the rear heat-insulating pipe 2 relative to the rear heat-insulating pipe 2 to adjust the axial distance between the front end of the rear heat-insulating pipe 2 and the front end of the needle bar 3, and the length of the axial distance can be represented by L1 and L1 shown in FIGS. 1a and 1b
L1+ Δ X1. Meanwhile, the axial distance may be characterized as an axial first distance.
Wherein, because the front-stage thermal insulation piping 1 is connected to the rear-stage thermal insulation piping 2, it can form the thermal insulation region 6, and its length can be characterized as L4 shown in FIG. 1a and FIG. 1 b.
The length of the effective shaft section 4 of the adjustable cryoablation needle may be varied with the axial distance between the forward end of the rear insulated tube and the forward end of the shaft.
The length of the active needle shaft section 4 is understood to be the length of the exposed tubular section of the needle shaft 3 for needle insertion, i.e. the insertable section of the operation.
In one example, it may be equal to the axial first distance, and the axial first distance is used to characterize the effective needle bar section 4 in fig. 1a, 1b and 2. in another example, the front end side of the rear thermal insulation tube 2 of the adjustable cryoablation needle may have a structural part partially for protection, limitation or other functions, which may surround the outside of the needle bar 3, the exposed part of the needle bar may be relatively reduced, and further, the length of the effective needle bar section 4 may be smaller than the axial first distance. In either way, the length of the active needle shaft section 4 can vary with the axial first distance.
It can be seen that, in the above embodiment, since the axial distance between the front end of the rear-section heat-insulating pipe and the front end of the needle rod is adjustable, and the length of the effective needle rod section of the adjustable cryoablation needle is changed along with the axial distance, the length of the effective needle rod section of the adjustable cryoablation needle which can be used for needle insertion can be changed, and further, the above embodiment can freely change the length according to different treatment requirements, so as to meet various treatment requirements. Therefore, the embodiment can avoid the invariance brought by the selection of the adjustable cryoablation needle model by a doctor, and can also fully adapt to different needle insertion depths, thereby being convenient for shortening the length of the exposed needle rod part as much as possible, avoiding the bending of the needle rod and avoiding the injury danger of tearing and the like to human tissues.
However, when the effective needle bar section 4 is changed, the longer the effective needle bar section is, and if the thermal insulation tube is not changed, the longer the length of the target region is, the larger the correspondingly formed ice ball is, and at this time, only a large tumor can be ablated at a deep position of a human body, and the shorter the length of the effective needle bar section is, the shorter the correspondingly formed ice ball is, and at this time, only a small tumor can be ablated at a shallow position of the human body. Therefore, when the length of the target area is changed along with the adjustment of the length of the effective needle bar section, the depth of the needle insertion and the size of the tumor cannot be considered.
Therefore, this embodiment also utilizes the embodiment shown in fig. 1a and 1b to avoid that the target area is lengthened synchronously when the effective needle bar section is lengthened.
Wherein the front-stage thermal insulation piping 1 is movable relative to the rear-stage thermal insulation piping 2 in the axial direction of the rear-stage thermal insulation piping to adjust the axial distance between the front end of the front-stage thermal insulation piping 1 and the front end of the rear-stage thermal insulation piping 2, the length of the axial distance being represented by L2 shown in fig. 1a and 1 b. Meanwhile, the axial distance may be characterized as an axial second distance.
Referring to fig. 1a and 1b, when the length of the effective needle bar section 4 changes, the position of the front-section heat insulation pipe 1 relative to the needle bar 3 can be fixed, and further, the front-section heat insulation pipe 1 can move axially relative to the rear-section heat insulation pipe 2 synchronously with the needle bar 3, so that the length of the target zone 5 of the adjustable cryoablation needle remains unchanged.
Taking fig. 1a and 1b as an example, when the needle bar 3 moves axially, the first axial distance may extend from L1 to L1+ Δ X1, and correspondingly, the length of the effective needle bar segment 4 may also correspond to the elongation Δ X1, and the length of the adiabatic region 6 may also correspond to the elongation Δ X1. Meanwhile, since the positions of the front-stage heat-insulating pipe 1 and the needle bar 3 are fixed relative to each other and both move together, the length of the target region 5 can be kept at L2 without change.
Referring to fig. 2, since the front thermal insulation pipe 1 is inserted into the rear thermal insulation pipe 2 from the front end of the rear thermal insulation pipe 2, an overlapping area is always present between the front thermal insulation pipe 1 and the rear thermal insulation pipe 2, thereby preventing the cold air in the needle from leaking out.
In other words, in the present embodiment, by the relative movement of the two thermal insulation pipes, on one hand, it is avoided that the thermal insulation area is difficult to secure the coverage of a part of the required position due to the movement of the thermal insulation pipes, and on the other hand, the adjustment of the target area mentioned above can be facilitated, so that both the coverage of the thermal insulation area and the adjustment of the target area are achieved.
Referring to FIG. 2, the thermal insulation piping can be specifically understood as a piping structure in which a vacuum gap layer can be formed, and the structure form of the vacuum gap layer can be arbitrary, which will be specifically exemplified in the following description.
In one embodiment, the adjustable cryoablation needle may further comprise an air inlet structure 7 and/or an air return structure 8.
The front end of the air inlet structure 7 may extend to the needle bar 3, and particularly may extend to a position near the front end of the needle bar 3, for example, to a needle tip of the needle bar 3, and the rear end of the air inlet structure 7 may be externally communicated through an air inlet channel, for example, may be directly or indirectly communicated with an air source.
The front end of the air return structure 8 can extend to one side of the back ends of the needle bars 3 and the front section heat insulation pipe 1 and can be positioned at the inner side of the back section heat insulation pipe 2, the air return structure 8 can be understood as any structure capable of guiding the air flowing through the needle bars 3 to return backwards, and the back end of the air return structure 8 can be directly or indirectly connected with equipment such as vacuum equipment and the like and can provide power for the return of the air.
Fig. 3 is a schematic end view of the needle bar and the needle bar adjustment structure according to an embodiment of the present invention; FIG. 4 is a schematic cross-sectional view A-A of FIG. 3; fig. 5 is a schematic view of an adjustable position of an adjustable cryoablation needle according to an embodiment of the present invention; fig. 6 is a schematic view of another position adjustment of an adjustable cryoablation needle according to an embodiment of the present invention.
Fig. 3 to 6 show an embodiment in which the needle bar 3 is fixed relative to the front-stage heat insulating pipe 1.
Referring to fig. 3 to 6, the adjustable cryoablation needle further includes a needle shaft adjusting structure 10 for moving the needle shaft 3 axially relative to the rear-section heat-insulating tube 2, wherein the needle shaft adjusting structure 10 is fixedly connected to the outer side of the needle shaft 3.
Referring to fig. 4-6, the adjustable cryoablation needle further includes a handle 11. The handle 11 here can also be understood as a knife housing.
The needle bar 3 is inserted into the handle 11 from the front end of the handle, and the rear-stage heat-insulating pipe 2 is arranged in the handle 11 and fixed relative to the handle 11. Based on the setting of the handle 11, the length of the effective needle bar section 4 may be the axial distance between the front end of the handle 11 and the front end of the needle bar 3.
Referring to fig. 5 and 6, in the adjustable cryoablation needle, a needle shaft adjusting groove 1101 is formed in a tubular wall of the handle 11 along an axial direction, and the needle shaft adjusting structure 10 passes through the needle shaft adjusting groove 1101 and can move along the needle shaft adjusting groove 1101.
Taking fig. 5 as an example, the needle bar 3 can be moved backward to an extreme position with respect to the handle 11 and the rear-stage heat-insulating pipe 2, and can be restricted by the rear end of the needle bar adjusting groove 1101, and taking fig. 6 as an example, the needle bar 3 can be moved forward to an extreme position with respect to the handle 11 and the rear-stage heat-insulating pipe 2, and can be restricted by the front end of the needle bar adjusting groove 1101.
Since the needle bar adjusting structure 10 is fixedly connected to the needle bar 3, the movement of the needle bar adjusting structure 10 in the axial direction is the movement of the needle bar 3 in the axial direction, and the needle bar 3 can be moved in the axial direction by the moving operation of the needle bar adjusting structure 10. It can be seen that the needle bar adjustment structure 10 provides an operable structure for the movement operation of the needle bar 3 located inside, facilitating the manipulation movement of the needle bar 3.
Referring to fig. 4 to 6, in an implementation, the needle bar adjusting structure 10 may include a needle bar slider 1001 and a needle bar shifting lever 1002 connected to the needle bar slider 1001, wherein the needle bar shifting lever 1002 is located outside the needle bar adjusting groove 1101, and correspondingly, the needle bar slider 1001 may be clamped in the needle bar adjusting groove 1101 and further move along the needle bar adjusting groove 1101.
Wherein, the rear end of the needle bar 3 can be fixed with the front section heat insulation pipe 1, and can be sealed, therefore, the length of the target area 5 is fixed, the needle bar slider 1001 is fixed at the middle rear position of the needle bar 3, the needle bar shifting lever 1002 is fixed with the needle bar slider 1001, therefore, shifting the needle bar shifting lever 1002 can drive the whole needle bar 3 and the front section heat insulation pipe 1 to move.
Fig. 7 is a schematic view in partial cross-section of an adjustable cryoablation needle in accordance with an embodiment of the present invention; fig. 8 is a schematic partial cross-sectional view of an adjustable cryoablation needle according to an embodiment of the present invention.
Referring to fig. 7 and 8 in conjunction with fig. 5 and 6, the air intake structure 7 includes a first air intake pipe 701 and a second air intake pipe 702 in a spring shape. The first intake pipe 701 may employ a J-T slot. The J-T slot may be inserted into the needle shaft 3, for example, until reaching the needle tip 301, and welded into place in a counterbore at the rear end of the needle tip 301.
In contrast, in some prior art, the position of the needle bar 3 and the air inlet tube such as the J-T slot is not fixed for the purpose of adjusting the target area, and the ice hockey is formed at the rear side of the needle point due to the too large gap between the knife shell, the needle bar and the J-T slot, and cannot completely cover the needle point, so that the knife head can stab other tissues. It can be seen that it can cause the puck to fail to cover the needle tip, increasing the risk of surgical penetration.
In particular, if the needle shaft and the J-T slot are not fixed relative to each other, during adjustment of the target zone, for example, because the J-T slot is typically fixed relative to the position of the insulated tubing, this results in relative movement between the J-T slot and the insulated tubing causing the distance between the forward end of the J-T slot and the needle tip to vary with the target zone. When the distance between the front end of the J-T groove and the needle tip is larger when the long target area is adjusted, the freezing medium sprayed out of the J-T groove cannot form a flowing state in the space of the needle bar in front of the J-T groove, and therefore the ice hockey cannot completely cover the needle tip. If the ice hockey does not cover the needle tip, this results in the needle tip having to pass completely through the tumor and into normal tissue during surgery, and if the tumor is adjacent to large blood vessels or vital organs, there is a significant risk of the needle tip passing completely through the tumor.
In addition, the needle bar can be further prevented from being ejected by high-pressure gas through fixing the needle bar and the J-T groove, so that a safety guarantee is added, and the operation is safer.
The front end of the first air inlet pipe 701 extends to the needle rod 3, and particularly extends to the needle tip 301 of the needle rod 3, the position of the first air inlet pipe 701 is fixed relative to the needle rod 3, the rear end of the first air inlet pipe 701 is connected with the front end of the second air inlet pipe 702, the rear end of the second air inlet pipe 702 is directly or indirectly connected with an air inlet channel 703, and the position of the air inlet channel 703 is fixed relative to the rear-section heat insulation pipe 2.
The second air inlet pipe 702 can be understood as a spring-shaped structure which can be stretched and compressed along the axial direction, and can meet the requirement of moving the needle bar 3 relative to the rear-section heat-insulating pipe 2 and the handle 11 through spring-mounted expansion and contraction.
In addition, the second air inlet pipe of the spring may be understood as a hollow pipe, specifically, for example, an independent spring, or a J-T groove may be wound, and it can be seen that the first air inlet pipe and the second air inlet pipe may be made of the same material or different materials, where the material of the second air inlet pipe may specifically be a memory metal material, or may also be stainless steel, spring steel, nitinol, or other memory metal materials.
Referring to fig. 5, when the needle bar adjusting structure 10 is located at the rear end of the needle bar adjusting groove 1101, the length of the effective needle bar segment 4 is the shortest, and the second air inlet pipe 702 in the shape of a spring can be in a natural state. The needle rod shifting lever 1002 is shifted forward, and the needle rod shifting lever drives the whole needle rod adjusting structure 10 and the needle rod 3 to move forward along the axial direction, so that the effective needle rod section 4 is lengthened, and the spring-like second air inlet pipe 702 is gradually stretched.
Referring to fig. 6, when the needle bar adjusting structure 10 moves to the front end of the needle bar adjusting groove 1101, the length of the effective needle bar segment 4 is longest, and the spring-like second air inlet pipe 702 is in the maximum stretching state.
In addition, the handle 11 can prevent the needle bar 3 from being ejected by the high-pressure gas, but if the handle is made of plastic material, the handle has limited strength and is easy to age, and if the handle is broken, the needle bar 3 can be ejected by the high-pressure gas without any additional safety guarantee measures. Therefore, in the alternative of the present embodiment, the first air inlet tube can be fixedly connected with the needle tip 301, so as to increase a safety guarantee for preventing the needle rod 3 from being ejected by the high-pressure gas.
In one embodiment, please refer to fig. 8, which can be understood as a further improvement on the embodiment shown in fig. 7, wherein the air inlet structure 7 further includes a finned tube 704 and a mandrel 705, the finned tube 704 is wound around the mandrel 705, a front end of the finned tube 704 is connected to a rear end of the second air inlet pipe 702, and a rear end of the finned tube 704 is directly or indirectly connected to the air inlet channel 703. Wherein the position of the mandrel 705 can be fixed with the rear-stage heat-insulating pipe 2 and the handle 11.
In the specific implementation process, the mandrel 705, the air inlet channel 703 and the air return channel 8 can be welded and fixed at the rear end of the rear-section heat-insulating pipe 2. The first air inlet pipe 701, the second air inlet pipe 702, the finned pipe 704 and the air inlet channel 703 can be welded and fixed in sequence.
Furthermore, the finned tube may be replaced by a spring-like second inlet tube. When the second air inlet pipe replaces the finned pipe, the spindle can be inserted into the spring-shaped second air inlet pipe, and heat exchange fins can also be added on the outer surface of the spring.
Namely: in one example, the air inlet structure 7 may further include a mandrel, the second air inlet pipe is wound around the mandrel, and the mandrel is fixed in position relative to the rear-stage heat insulation pipe. And heat exchange fins are arranged on the surface of the second air inlet pipe.
It can be seen that the finned tube 704 and the mandrel 705 are not provided separately from the description of the present embodiment. Meanwhile, the solution without the finned tube 704 is beneficial to reducing the length of the whole handle 11, and the solution with the finned tube 704 and the mandrel 705 is beneficial to improving the position stability of the air inlet structure 7.
The mandrel 705 referred to above may be a hollow tubular structure. The hollow space can be penetrated by a temperature measuring wire, the temperature measuring wire can extend to the foremost end of the heat insulation pipe to measure the temperature at the position and feed back to the rear end, and the temperature measuring wire and the mandrel can be sealed through glue pouring.
In a specific implementation, the first intake pipe 701 is further provided with an orifice 706. In one example, the orifice 706 may be located on the leading side of the insulated pipe at all times to ensure that the orifice 706 is located inside the target area at all times at any adjustment position.
In one embodiment, the needle bar 3 and the front section heat insulation pipe 1 may be fixed in a sealing manner, in another embodiment, the needle bar 3 and the front section heat insulation pipe 1 may not be sealed when connected, and further, the needle bar is sealed by a needle bar sealing assembly (not shown), for example: the adjustable cryoablation needle further comprises a needle rod sealing assembly located at the rear end of the needle rod 3 and capable of being fixedly arranged at the rear end of the needle rod 3, and the needle rod sealing assembly is used for sealing a gap between the inner wall of the needle rod 3 and the outer wall of the front section heat insulation pipe 1. Through the needle bar sealing assembly, the gas in the needle can be effectively prevented from leaking.
Referring to fig. 3, 5 and 6 in combination with other figures, the adjustable cryoablation needle further includes a rear thermal insulation tube sealing assembly 9 disposed at the front end of the rear thermal insulation tube 2, which can be fixedly disposed at the front end of the rear thermal insulation tube 2, and this embodiment does not exclude an embodiment in which the rear thermal insulation tube sealing assembly is disposed at the handle 11 or other structures. The rear-stage heat-insulating seal assembly 9 is used for sealing a gap inside the inner wall of the rear-stage heat-insulating pipe 2.
In one example, if the needle bar 3 is inserted into the front end of the rear-stage heat insulation pipe 2: the rear heat-insulating tube sealing assembly 9 is used for sealing a gap between the outer wall of the needle bar 3 and the inner wall of the rear heat-insulating tube 2.
In another example, if the front-stage heat-insulating pipe 1 is inserted into the rear-stage heat-insulating pipe 2 and the needle bar is not inserted into the rear-stage heat-insulating pipe, then: the rear heat-insulating pipe sealing unit 9 is used to seal a gap between the outer wall of the front heat-insulating pipe 1 and the inner wall of the rear heat-insulating pipe 2.
The rear heat-insulating tube sealing assembly 9 can help prevent cold air in the needle from leaking out.
In a specific implementation process, the rear thermal insulation pipe sealing assembly 9 may include a rear thermal insulation pipe front retainer ring 902, a rear thermal insulation pipe sealing ring 901 and a rear thermal insulation pipe rear retainer ring 903.
The rear thermal insulation piping rear retainer 903 may be connected to the front end of the rear thermal insulation piping 2, and the rear thermal insulation piping front retainer 902 may be connected to the rear thermal insulation piping rear retainer 903 from the inside and the front side of the rear thermal insulation piping rear retainer 903, wherein a space for accommodating the rear thermal insulation piping seal 901 may be formed on the rear end side of the rear thermal insulation piping front retainer 902, the front end side of the rear thermal insulation piping rear retainer 903, and the inside of the rear thermal insulation piping rear retainer.
The rear heat-insulating pipe front retainer 902 and the rear heat-insulating pipe rear retainer 903 can be connected together through a threaded structure.
In a specific implementation, the rear thermal insulation pipe rear retainer 903 can close a gap in the rear thermal insulation pipe 2.
Fig. 9 is a schematic structural view of a front-stage heat-insulating pipe according to an embodiment of the present invention.
In one embodiment, referring to fig. 9 and other drawings, the front-stage heat-insulating pipe 1 includes a front-stage inner pipe 102 and a front-stage outer pipe 101, a front-stage vacuum interlayer is formed between the front-stage inner pipe 102 and the front-stage outer pipe 101, a front end of the front-stage inner pipe 102 is connected to a front end of the front-stage outer pipe 101, and a rear end of the front-stage inner pipe 102 is connected to a rear end of the front-stage outer pipe 101. In the specific implementation process, at least one end of the front section vacuum interlayer can be welded and sealed in a vacuum mode to form the permanent vacuum interlayer.
In a specific implementation process, referring to fig. 9, the rear end of the front section inner pipe 102 and the rear end of the front section outer pipe 101 may be connected by a thermal insulation pipe gasket 103, and the rear end of the thermal insulation pipe gasket 103 may have a tapered inner hole. Further, the external connection may be adapted through a tapered bore.
Wherein the thermal insulating pipe gasket 103 can be used to line the gap between the front section outer pipe 101 and the front section inner pipe 102.
In one embodiment, referring to fig. 4, the inner diameter and the outer diameter of the front-stage thermal insulation pipe 1 can be kept constant. In another embodiment, referring to fig. 9, the front-end thermal insulation piping 1 includes a first piping segment 104, a connecting piping segment 106, and a second piping segment 105 along the axial direction, wherein the rear end of the first piping segment 104 is connected to the front end of the connecting piping segment 106, the rear end of the connecting piping segment 106 is connected to the front end of the second piping segment 105, the inner diameter of the second piping segment 105 is larger than the inner diameter of the first piping segment 104, and the outer diameter of the second piping segment 105 is larger than the outer diameter of the first piping segment 104.
Through the change of the inner diameter and the outer diameter, the following steps can be realized: the first pipe segment 104 of the front section of the thermal insulation pipe 1 can be conveniently and fittingly inserted into the needle bar 3, and the second pipe segment 104 of the front section of the thermal insulation pipe 1 can be conveniently and fittingly inserted into the rear section of the thermal insulation pipe 2.
In one embodiment, referring to fig. 7 and 8, the rear-section thermal insulation pipe 2 includes a rear-section inner pipe 202 and a rear-section outer pipe 201, a rear-section vacuum interlayer is formed between the rear-section inner pipe 202 and the rear-section outer pipe 201, a front end of the rear-section inner pipe 202 is connected to a front end of the rear-section outer pipe 201, and a rear end of the rear-section inner pipe 202 is connected to a rear end of the rear-section outer pipe 201.
Wherein, the front end of the rear section inner pipe 202 and the front end of the rear section outer pipe 201 can be connected by the rear heat insulation pipe sealing assembly 9, and the rear end of the rear section inner pipe 202 and the rear end of the rear section outer pipe 201 can be sealed by vacuum welding, thereby forming a layer with permanent vacuum gap.
In summary, in the adjustable cryoablation needle provided by this embodiment, since the axial distance between the front end of the rear-section thermal insulation tube and the front end of the needle rod is adjustable, and the length of the effective needle rod section of the adjustable cryoablation needle is changed along with the axial distance, the length of the effective needle rod section of the adjustable cryoablation needle that can be used for needle insertion can be changed, and further, the length can be freely changed according to different treatment requirements, so as to meet various treatment requirements. Therefore, the present embodiment can avoid the invariance brought by the doctor selecting the adjustable cryoablation needle model, and can also fully adapt to different needle insertion depths, so as to facilitate the length of the exposed needle rod part to be as short as possible, avoid the bending of the needle rod, and avoid the injury risks such as tearing and the like to human tissues.
Simultaneously, along with the length change of effective needle pole section in this embodiment, avoided the targeting district length to change along with the change of effective needle pole section in step, it is corresponding, the puck size that this embodiment formed can be definite, and then, can satisfy the treatment demand of the similar tumour of size under the different depth of insertion, thereby be convenient for compromise needle depth and tumour size simultaneously, also can be at the in-process of treating the tumour, the guarantee targeting district can not change, avoid because of the damage hidden danger that the change in the treatment in-process targeting district caused.
In addition, the adjustment is realized in the alternative scheme, the position between the needle rod and the J-T groove can be relatively fixed, and the relative fixation of the position between the needle rod and the J-T groove can avoid the overlarge distance between the front end of the J-T groove and the needle point, so that the ice hockey can be prevented from completely covering the needle point, and the puncture risk to viscera and blood vessels is prevented. Meanwhile, the needle rod can be prevented from being ejected by high-pressure gas, and the safety is further improved.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.
Claims (16)
1. An adjustable cryoablation needle, comprising: the needle rod, the front section heat insulation pipe and the rear section heat insulation pipe; the front section heat insulation pipe is inserted into the needle rod from the rear end of the needle rod, and the front section heat insulation pipe is also inserted into the rear section heat insulation pipe from the front end of the rear section heat insulation pipe;
the needle bar can move relative to the rear section heat insulation pipe along the axial direction of the rear section heat insulation pipe so as to adjust the axial distance between the front end of the rear section heat insulation pipe and the front end of the needle bar; the front section of the heat insulation pipe can move relative to the rear section of the heat insulation pipe along the axial direction of the rear section of the heat insulation pipe synchronously with the needle rod, so that the length of the target area of the adjustable cryoablation needle is kept unchanged;
wherein the length of the effective shaft section of the adjustable cryoablation needle is a function of the axial distance between the front end of the rear insulated tube and the front end of the shaft.
2. The adjustable cryoablation needle of claim 1, further comprising a needle shaft adjustment structure for moving the needle shaft relative to the rear insulated tube in an axial direction of the rear insulated tube, the needle shaft adjustment structure being fixedly attached to an outer side of the needle shaft.
3. The adjustable cryoablation needle of claim 2, further comprising a handle;
the needle rod is inserted into the handle from the front end of the handle, and the rear-section heat-insulating pipe is arranged in the handle and is relatively fixed with the handle; the length of the effective needle bar section is the axial distance between the front end of the handle and the front end of the needle bar; the needle rod adjusting structure penetrates through the needle rod adjusting groove and can move along the needle rod adjusting groove.
4. The adjustable cryoablation needle of claim 3, wherein the needle shaft adjustment structure comprises a needle shaft slider fixedly connected to the needle shaft and a needle shaft lever connected to the needle shaft slider, the needle shaft lever being located outside the needle shaft adjustment slot.
5. The adjustable cryoablation needle according to any one of claims 1 to 4, further comprising an air inlet structure, wherein the air inlet structure comprises a first air inlet pipe and a second air inlet pipe in a spring shape, the front end of the first air inlet pipe extends to the needle bar, the position of the first air inlet pipe is fixed relative to the needle bar, the rear end of the first air inlet pipe is connected with the front end of the second air inlet pipe, the rear end of the second air inlet pipe is directly or indirectly connected with an air inlet channel, the position of the air inlet channel is fixed relative to the rear-section heat insulation pipe, and the second air inlet pipe can be compressed and stretched in the axial direction.
6. The adjustable cryoablation needle according to claim 5, wherein the air inlet structure further comprises a finned tube and a mandrel, the finned tube is wound on the mandrel, the front end of the finned tube is connected with the rear end of the second air inlet tube, the rear end of the finned tube is directly or indirectly connected with the air inlet channel, and the mandrel is fixed in position relative to the rear-section heat insulation tube.
7. The adjustable cryoablation needle of claim 5, wherein the second inlet conduit is in an unstretched, natural state when the effective shaft segment length is at a minimum.
8. The adjustable cryoablation needle of claim 5, wherein the second inlet tube is made of any one of the following materials: spring steel and memory metal material.
9. The adjustable cryoablation needle of claim 5, wherein the material of the second inlet tube is stainless steel.
10. The adjustable cryoablation needle of claim 5, wherein the air inlet structure further comprises a mandrel around which the second air inlet tube is wound, the mandrel being fixed in position relative to the rear insulated tube.
11. The adjustable cryoablation needle of claim 9, wherein the second inlet tube has heat exchanging fins on its surface.
12. The adjustable cryoablation needle according to any of claims 1 to 4, further comprising a rear insulation tube sealing assembly located at a forward end of the rear insulation tube section; the rear section heat insulation sealing assembly is used for sealing a gap on the inner side of the inner wall of the rear section heat insulation pipe.
13. The adjustable cryoablation needle according to any one of claims 1 to 4, wherein the front-section heat insulation tube comprises a front-section inner tube and a front-section outer tube, a front-section vacuum interlayer is formed between the front-section inner tube and the front-section outer tube, the front end of the front-section inner tube is connected with the front end of the front-section outer tube, and the rear end of the front-section inner tube is connected with the rear end of the front-section outer tube.
14. The adjustable cryoablation needle of claim 13, wherein the rear end of the front section inner tube is connected to the rear end of the front section outer tube by an insulating tube washer, the rear end of the insulating tube washer having a tapered inner bore.
15. The adjustable cryoablation needle of claim 14 wherein the front insulating tube has a first tube section, a connecting tube section, and a second tube section along an axial direction, wherein a rear end of the first tube section is connected to a front end of the connecting tube section, a rear end of the connecting tube section is connected to a front end of the second tube section, an inner diameter of the second tube section is larger than an inner diameter of the first tube section, and an outer diameter of the second tube section is larger than an outer diameter of the first tube section.
16. The adjustable cryoablation needle according to any one of claims 1 to 4, wherein the rear-section heat insulation tube comprises a rear-section inner tube and a rear-section outer tube, a rear-section vacuum interlayer is formed between the rear-section inner tube and the rear-section outer tube, the front end of the rear-section inner tube is connected with the front end of the rear-section outer tube, and the rear end of the rear-section inner tube is connected with the rear end of the rear-section outer tube.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921304879.3U CN211409333U (en) | 2019-08-13 | 2019-08-13 | Adjustable cryoablation needle |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921304879.3U CN211409333U (en) | 2019-08-13 | 2019-08-13 | Adjustable cryoablation needle |
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| CN211409333U true CN211409333U (en) | 2020-09-04 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110327108A (en) * | 2019-08-13 | 2019-10-15 | 上海导向医疗系统有限公司 | Adjustable cryoablation needle |
| CN113842204A (en) * | 2021-11-11 | 2021-12-28 | 上海导向医疗系统有限公司 | Double J-T groove cryoablation needle |
-
2019
- 2019-08-13 CN CN201921304879.3U patent/CN211409333U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110327108A (en) * | 2019-08-13 | 2019-10-15 | 上海导向医疗系统有限公司 | Adjustable cryoablation needle |
| CN113842204A (en) * | 2021-11-11 | 2021-12-28 | 上海导向医疗系统有限公司 | Double J-T groove cryoablation needle |
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