CN211131353U - Curved adjustable cryoablation needle - Google Patents
Curved adjustable cryoablation needle Download PDFInfo
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- CN211131353U CN211131353U CN201921319747.8U CN201921319747U CN211131353U CN 211131353 U CN211131353 U CN 211131353U CN 201921319747 U CN201921319747 U CN 201921319747U CN 211131353 U CN211131353 U CN 211131353U
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Abstract
The utility model relates to an adjustable cryoablation needle of curved type, including adjusting part and fixed part, adjusting part can for the fixed part motion is in order to adjust the length in target district: the fixing part comprises a heat insulation pipe and an air return pipe, the heat insulation pipe is a bent pipe, and the air return pipe is inserted from the rear end of the heat insulation pipe and is fixedly connected with the heat insulation pipe; the adjusting component comprises a needle bar and an air inlet pipe fitting, and the needle bar is sleeved outside the front section of the heat insulation pipe and is in axial sliding connection with the heat insulation pipe; the air inlet pipe fitting is inserted into the needle rod from the rear end of the heat insulation pipe and extends into the needle rod, the air inlet pipe fitting is fixedly connected with the needle rod, the needle rod is linked with the air inlet pipe fitting to adjust the length of the target area, and the technical problems that an existing cryoablation needle is complex in treatment operation and prone to injuring peripheral healthy tissues due to the fact that the target area is fixed are solved.
Description
Technical Field
The utility model relates to a cryoablation needle, in particular to a curved adjustable cryoablation needle.
Background
Cryoablation is a treatment that utilizes cryogenic temperatures to destroy diseased tissue and is considered an efficient, minimally invasive method of treating malignancies. The cryoablation technology has simple and convenient operation, few complications and effective analgesia, and the ice hockey formed by ablation has clear boundary and convenient observation, and can safely ablate the focus close to the great vessels or important visceral organs. The cryoablation can also adopt a multi-needle freezing mode, so that the ablation range is wider, and the cryoablation is suitable for large focuses and morphologically irregular focuses.
The target area (i.e. the effective freezing area) is positioned at the front end of the needle head of the cryoablation needle, the length of the target area determines the size of the freezing range, and the longer the target area is, the larger the ice ball formed by freezing is. However, most of the target regions of the existing cryoablation needles are fixed structures, the size of the generated ice ball is also fixed, and in clinical application, doctors need to select cryoablation needles with different target region lengths according to the size of a focus. For the irregular-shaped pathological tissues, a plurality of probes with different specifications are required to be used for carrying out treatment operation repeatedly, and the surrounding healthy tissues are easy to be injured. For example, for a pear-shaped tumor with a large head end and a small tail end, a single cryoablation needle with a long target area can be used for large-scale ablation in clinical practice at present, but a circle of normal tissues with more damage can be generated in the middle of the pear; the ablation can also be achieved by placing two cryoablation needles with short target areas in front and back for different times of freezing, but this increases the cost and difficulty of the operation.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide an adjustable cryoablation needle of curved type to solve current cryoablation needle and cause the treatment operation complicated and easily hinder the technical problem of peripheral healthy tissue because of the target district is fixed.
The utility model provides an adjustable cryoablation needle of curved type, including adjusting part and fixed part, adjusting part can for the fixed part motion is in order to adjust the length in target district:
the fixing part comprises a heat insulation pipe and an air return pipe, the heat insulation pipe is a bent pipe, and the air return pipe is inserted from the rear end of the heat insulation pipe and is fixedly connected with the heat insulation pipe;
the adjusting component comprises a needle bar and an air inlet pipe fitting, and the needle bar is sleeved outside the front section of the heat insulation pipe and is in axial sliding connection with the heat insulation pipe; the air inlet pipe fitting is inserted into the needle bar from the rear end of the heat insulation pipe and extends into the needle bar, the air inlet pipe fitting is fixedly connected with the needle bar, and the needle bar is linked with the air inlet pipe fitting to adjust the length of the target area.
Preferably, a counter bore is arranged in the needle point of the needle rod and is communicated with the inside of the needle rod, and the front end of the air inlet pipe fitting is fixed in the counter bore; the air inlet pipe fitting is provided with a plurality of throttling holes which are always positioned in front of the heat insulation pipe; or the like, or, alternatively,
the outer wall of the air inlet pipe fitting is fixedly arranged on the inner wall of the needle rod, and the front end of the air inlet pipe fitting is provided with a throttling hole.
Preferably, the needle rod is sleeved outside the front section of the heat insulation pipe through a sealing piece and is axially and slidably connected with the heat insulation pipe;
the air inlet pipe fitting is telescopic, the air inlet pipe fitting and the air return pipe are inserted from the rear end of the heat insulation pipe, and the outer walls of the air inlet pipe fitting and the air return pipe are fixedly connected with the rear end of the heat insulation pipe in a seamless mode.
Preferably, the sealing element comprises a sealing ring, a groove for accommodating the sealing ring is arranged on the front section of the needle rod or the heat insulation pipe, and the sealing ring is arranged between the needle rod and the front section of the heat insulation pipe in a dynamic sealing manner; or the like, or, alternatively,
the sealing element comprises a sealing ring and a sealing ring baffle, the sealing ring baffle is fixedly arranged on the front section of the needle rod or the heat insulation pipe, a groove for accommodating the sealing ring is formed in the sealing ring baffle, and the sealing ring is movably sealed between the needle rod and the front section of the heat insulation pipe.
Preferably, the sealing ring baffle comprises a front baffle and a rear baffle, the front baffle is sleeved at the rear end of the needle rod, the rear baffle is fixedly connected with the front baffle in a threaded manner, a groove facing the front section of the heat insulation pipe is formed between the front baffle and the rear baffle, and the sealing ring is embedded in the groove.
Preferably, at least one section of the air inlet pipe is of a spring structure, and the spring structure can be stretched or compressed along with the axial movement of the needle rod relative to the front section of the heat insulation pipe.
Preferably, the air inlet pipe fitting comprises a J-T groove, a finned tube and an air inlet pipe, wherein the front end and the rear end of the finned tube are respectively communicated with the J-T groove and the air inlet pipe;
the front section of the J-T groove is wound into a spring structure, and the spring structure is always positioned in the needle rod and is positioned at the front end of the heat insulation pipe;
or the like, or, alternatively,
the middle section of the J-T groove is wound into a spring structure and is always positioned in the heat insulation pipe;
or the like, or, alternatively,
and a spring structure is communicated between the J-T groove and the finned tube or/and between the finned tube and the air inlet pipe, and the spring structure is a spring tube.
Preferably, the fixing component further comprises a mandrel, the mandrel is inserted from the rear end of the heat insulation pipe, and the outer wall of the mandrel is fixedly connected with the rear end of the heat insulation pipe without a gap;
the finned tube is wound into a plurality of spiral coils, and the mandrel penetrates through the spiral coils of the finned tube.
Preferably, the air inlet pipe fitting comprises a J-T groove, a spring structure and an air inlet pipe, the front end and the rear end of the spring structure are respectively communicated with the J-T groove and the air inlet pipe, and fins are further arranged on the outer side of the spring structure;
the ablation needle further comprises a mandrel inserted from the rear end of the insulated tube, the mandrel passing through the helical turn of the spring structure;
preferably, the fixing component further comprises a temperature measuring line, the temperature measuring line passes through the mandrel and extends forwards through the inside of the heat insulation pipe, and a temperature measuring point of the temperature measuring line is located at the foremost end of the heat insulation pipe.
Preferably, the mandrel is of a hollow tubular structure, and the temperature measuring line and the mandrel are sealed by pouring glue.
Preferably, still include regulation driving lever and handle:
the handle wraps the outer side of the heat insulation pipe and is fixedly connected with the heat insulation pipe, an adjusting groove is formed in the side wall of the handle, the adjusting deflector rod penetrates through the adjusting groove and is fixedly connected with the needle rod, the adjusting deflector rod is pushed axially, and the adjusting deflector rod drives the needle rod to move axially relative to the front section of the heat insulation pipe.
Preferably, the side wall of the handle is further provided with a plurality of safety locking grooves, the safety locking grooves are located on the outer side of the adjusting groove and communicated with the adjusting groove, and the adjusting deflector rod can be clamped into the safety locking grooves to be fixed.
Preferably, the safety locking groove comprises a radial rotating groove and a safety clamping groove, the radial rotating groove is positioned in the radial direction of the needle rod, and the radial rotating groove is arranged on the outer side of the adjusting groove and communicated with the adjusting groove; the safety clamping groove is positioned in the axial direction of the needle rod, and is arranged on the outer side of the radial rotating groove and communicated with the radial rotating groove;
and the adjusting deflector rod is rotated along the circumferential direction of the handle to the radial rotating groove, and then the adjusting deflector rod is axially moved to be clamped into the safety clamping groove.
Preferably, the wall of the heat insulation pipe is a double-layer vacuum wall:
the heat insulation pipe comprises a heat insulation inner pipe and a heat insulation outer pipe, and the heat insulation inner pipe is fixedly connected with two ends of the heat insulation outer pipe; and a vacuum interlayer is formed between the heat insulation inner pipe and the heat insulation outer pipe.
Preferably, the front section of the heat insulation pipe is a straight pipe, the middle section of the heat insulation pipe is a bent pipe, and the rear section of the heat insulation pipe is a straight pipe.
Compared with the prior art, the utility model discloses there are following technological effect:
1. the utility model discloses a needle bar linkage air inlet pipe's axial displacement is in order to realize the length adjustment in target district, has solved current cryoablation needle and has caused the treatment operation complicated and easily hinder the technical problem of peripheral healthy tissue because of the target district is fixed.
2. The existing cryoablation needle with the adjustable target area has at least two parts needing to be sealed, and because the existing sealing structure adopts the sealing ring to realize sealing and the sealing ring is an easily-consumed device, the more the parts needing to be sealed, the higher the probability of air leakage is, and once air leakage occurs in the operation process, the frostbite of patients and doctors is possibly caused. Therefore, the utility model discloses reduce the quantity of sealing washer to one, reduced the probability of gas leakage, improved the security of cryotherapy operation.
3. The air inlet pipe fitting is of a telescopic structure, the front end of the air inlet pipe fitting is fixedly connected with the front end of the needle rod, the position of a throttling hole in the adjustment process of the target area is guaranteed to move along with the needle rod, the ice hockey can grow forwards to cover the needle point, and the situation that the needle point needs to penetrate through a tumor and be inserted into normal tissues in an operation due to the fact that the throttling hole is too far away from the needle point in the adjustment process is avoided.
4. The handle department is equipped with the dead groove of safety lock of fixed regulation driving lever, when adjusting the driving lever and removing to required position, will adjust the driving lever through the dead groove of safety lock and fix, not only prevents adjusting part relatively fixed part and removes and cause the unexpected regulation of target district length, moreover, through the front and back end of air inlet pipe spare respectively with the needle bar with the thermal-insulated fixed connection between the pipe, such cooperation structure has still ensured that the needle bar can not be washed out by high-pressure gas.
5. The bending type hand-held operation is more comfortable due to the hand-held comfort of doctors.
6. The curved cryoablation needle is inserted under the guidance of CT, so that the interference between the extension tube behind the handle and the window when the curved cryoablation needle enters and exits the CT scanning window is avoided, and the extension tube behind the handle is basically horizontal after the curved cryoablation needle is inserted into a human body, so that the curved cryoablation needle cannot interfere with the window during CT scanning. Therefore, the curved cryoablation needle is more suitable for minimally invasive surgeries such as CT, nuclear magnetic resonance and the like.
Of course, it is not necessary for any particular product to achieve all of the above-described advantages at the same time.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the description below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts. In the drawings:
fig. 1 is a schematic structural view of a curved adjustable cryoablation needle according to the present invention;
FIG. 2 is a schematic structural view of the spring structure disposed in the target area when the target area is the shortest in the present invention;
fig. 3 is a schematic structural view of the spring structure disposed in the target area when the target area is the longest in the present invention;
FIG. 4 is a schematic structural view of the spring structure disposed in the heat insulation pipe when the target area is shortest in the present invention;
FIG. 5 is a schematic structural view of the spring structure disposed inside the heat insulation pipe when the target area is longest in the present invention;
FIG. 6 is a schematic view of the structure of the present invention in which the spring structure acts as a finned tube when the target area is the shortest;
FIG. 7 is a schematic view of the spring structure acting as a finned tube with the longest target zone according to the present invention;
fig. 8 is a schematic structural view of the adjusting deflector rod in the adjusting groove of the present invention;
fig. 9 is a schematic structural view of the adjusting deflector rod in the radial rotating groove of the present invention;
fig. 10 is a schematic structural view of the safety slot of the present invention.
Detailed Description
The present invention provides a curved adjustable cryoablation needle, which will be described in detail with reference to fig. 1 to 10, and the present embodiment is implemented on the premise of the technical solution of the present invention, and detailed embodiments and specific operation procedures are given, but the scope of the present invention is not limited to the following embodiments, and those skilled in the art can modify and color the curved adjustable cryoablation needle without changing the spirit and content of the present invention.
Referring to fig. 1 to 7, a curved adjustable cryoablation needle comprises an adjusting member 1 and a fixing member 2, wherein the adjusting member 1 is axially movable relative to the fixing member 2 to form a target zone 3 with adjustable length and an insulation zone 4 with fixed length on the outer surface of the ablation needle:
the fixing component 2 comprises a heat insulation pipe 21 and a return air pipe 22, wherein the heat insulation pipe 21 is a bent pipe, and the return air pipe 22 is inserted from the rear end of the heat insulation pipe 21 and fixedly connected with the heat insulation pipe;
the adjusting component 1 comprises a needle bar 11 and an air inlet pipe fitting 12, wherein the needle bar 11 is sleeved outside the front section of the heat insulation pipe 21 and is in axial sliding connection with the heat insulation pipe; the air inlet pipe fitting 12 is inserted into the needle bar 11 from the rear end of the heat insulation pipe 21 and extends into the needle bar 11, the air inlet pipe fitting 12 is fixedly connected with the needle bar 11, and the needle bar 11 adjusts the length of the target area 3 by interlocking with the air inlet pipe fitting 12.
The utility model does not specifically limit the bending shape of the heat insulation pipe 21, and the specific shape of the structure can be determined according to the specific operation requirement. If the front section of the heat insulation pipe 21 is a straight pipe, the middle section is a bent pipe, and the rear section is a straight pipe; or the front section is a straight pipe, and the rear section is a bent pipe; or the front section is a bent pipe, and the rear section is a straight pipe; or the heat insulation pipe 21 is only composed of at least one bent pipe, as long as the needle bar 11 is sleeved outside the front section of the heat insulation pipe 21 and slides axially with the front section of the heat insulation pipe 21, and in the relative axial sliding process of the needle bar 11 and the front section of the heat insulation pipe 21, the needle bar 11 drives the air inlet pipe fitting 12 to move in the heat insulation pipe 21 so as to adjust the length of the target area 3.
The following detailed description is given with reference to the accompanying drawings as an example, but the present invention is not limited thereto.
In this embodiment, the heat insulation pipe 21 includes a first straight pipe 213, an elbow pipe 214 and a second straight pipe 215 which are integrally formed, that is, the front section and the rear section of the heat insulation pipe 21 are both straight pipes, the elbow pipe 214 is arranged in the middle, the first straight pipe 213 and the second straight pipe 215 are respectively communicated with the front end and the rear end of the elbow pipe 214, and the air return pipe 22 is inserted from the rear end of the second straight pipe 215 and fixedly connected therewith;
the adjusting component 1 comprises a needle bar 11 and an air inlet pipe component 12, wherein the needle bar 11 is sleeved on the first straight pipe 213 and is connected with the first straight pipe in a sliding way; the air inlet pipe fitting 12 is inserted into the needle bar 11 from the rear end of the second straight pipe 215 and extends into the needle bar 11, and the air inlet pipe fitting 12 is fixedly connected with the needle bar 11.
The tube wall of the heat insulation tube 21 is made of heat insulation material, and can also adopt a double-layer vacuum wall, the utility model discloses do not do specific limitation, the double-layer vacuum wall is preferably selected in this embodiment, namely the heat insulation tube 21 includes a heat insulation inner tube 211 and a heat insulation outer tube 212, the heat insulation inner tube 211 is fixedly connected with both ends of the heat insulation outer tube 212, the heat insulation inner tube 211 can be fixedly connected with both ends of the heat insulation outer tube 212 by flat openings, or fixedly connected with flaring openings, or fixedly connected with necking openings, the utility model discloses do not do limitation to this; a vacuum interlayer is formed between the inner insulating pipe 211 and the outer insulating pipe 212.
The inner diameters of the first straight tube 213 and the second straight tube 215 may be the same or different, and the present invention does not specifically limit this. In the present embodiment, since the rear end of the second straight pipe 215 needs to accommodate the fin, the inner diameter of the second straight pipe 215 needs to be larger than the inner diameter of the first straight pipe 213. In order to connect the first straight pipe 213 and the second straight pipe 215, the heat insulation pipe 21 includes a first straight pipe 213 section, a connecting pipe section and a second straight pipe 215 section which are fixedly connected and communicated in sequence, the inner diameter of the second straight pipe 215 section is the same as the inner diameter of the second straight pipe 215, the inner diameter of the first straight pipe 213 section is smaller than the inner diameter of the second straight pipe 215 section, the connecting pipe is a flared pipe, that is, the inner diameter of one end of the connecting pipe is the same as the inner diameter of the first straight pipe 213 section, and the inner diameter of the other end of the connecting pipe is the same as the inner diameter of the second straight pipe 215 section. In the present embodiment, the wall thicknesses of the respective components of the insulating tube 21 are the same. Further, the needle shaft 11 is axially slidably connected to the first straight tube 213.
In the embodiment, the front end of the needle rod 11 is provided with a needle tip 111, and the needle tip 111 is blind and closed; the needle rod 11 has a space for accommodating the front section of the air inlet pipe 12 and the first straight pipe 213, in this embodiment, the needle rod 11 is a straight-tube structure, the vertical distance between the front end of the needle tip 111 and the front end face of the first straight pipe 213 (the front end face is the end face with the largest outer diameter of the first straight pipe 213) is the length of the targeting region 3, and the length of the targeting region 3 is variable along with the relative axial sliding between the needle rod 11 and the first straight pipe 213; the overall length of the insulating tube 21 is the length of the insulating zone 4, which is fixed.
In the present invention, the front end of the air inlet pipe 12 is fixedly connected to the front end of the needle bar 11, the front end of the air inlet pipe 12 transports the air conditioning to the needle bar 11 by opening the throttle 1211, and the structure of the throttle 1211 is described in detail with reference to two embodiments.
As an embodiment, referring to fig. 4 to 7, a counterbore is formed in the needle tip 111 of the needle bar 11, the counterbore is communicated with the inside of the needle bar 11, and the front end of the air inlet pipe 12 is inserted into and fixed in the counterbore; the air inlet pipe member 12 is provided with a plurality of orifices 1211, and the plurality of orifices 1211 are always positioned in front of the heat insulation pipe 21, namely, the orifices 1211 do not enter the heat insulation pipe 21 no matter how the needle bar 11 and the heat insulation pipe 21 slide relatively.
Furthermore, a plurality of orifices 1211 are respectively and uniformly distributed along the axial direction or the radial direction of the air inlet pipe fitting 12, the length of the distribution section of the orifices 1211 should not be greater than the length from the rear end face of the needle tip 111 to the front end face of the heat insulation wall in the shortest target area 3, so as to ensure that the orifices 1211 are always located inside the target area 3 when the target area 3 is at any adjusting position, and if part of the orifices 1211 is located inside the heat insulation pipe 21, part of cold energy cannot be released in the target area 3.
As another embodiment, referring to fig. 2 and 3, the outer wall of the front end of the air inlet pipe 12 is fixed on the inner wall of the needle bar 11, and the front end of the air inlet pipe 12 is provided with an orifice 1211.
In the present invention, a dynamic seal is provided between the needle bar 11 and the first straight tube 213 at the front end. The utility model discloses do not do concrete restriction with the mode that realizes sealed effect to rear end muffler and air inlet pipe respectively and between the thermal-insulated pipe adopt the sealing washer sealed still direct seamless fixed connection. In the prior art, at least two parts of the existing cryoablation needle of the adjustable targeting area 3 need to be sealed, and because the existing sealing structures adopt sealing rings to realize sealing, and the sealing rings are easily-consumed devices, the more the parts needing to be sealed, the higher the probability of air leakage is, and once air leakage occurs in the operation process, the frostbite to patients and doctors is possibly caused. Therefore, the utility model discloses the preferred quantity with the sealing washer reduces to one, has reduced the probability of gas leakage, has improved the security of cryotherapy operation, and concrete structure is as follows:
in this embodiment, the inner diameter of the needle shaft 11 is larger than the outer diameter of the first straight tube 213, and a gap is provided between the inner wall of the needle shaft 11 and the outer wall of the first straight tube 213, and a dynamic seal is used between the needle shaft 11 and the first straight tube 213 in order to prevent cold from leaking from this gap.
Further, the needle bar 11 and the first straight pipe 213 are dynamically sealed by a sealing member 13:
in one embodiment, the sealing element 13 includes a sealing ring 131, an annular groove is opened on an inner wall of the needle shaft 11 or an outer wall of the first straight pipe 213, the sealing ring 131 is embedded in the groove, and the sealing ring 131 is movably and sealingly disposed between the needle shaft 11 and the first straight pipe 213;
in another embodiment, the sealing element 13 includes a sealing ring 131 and a sealing ring baffle, both of which are annular structures, the sealing ring 131 and the sealing ring baffle are fixed on the needle shaft 11 or the first straight pipe 213, the sealing ring baffle is provided with a groove for accommodating the sealing ring 131, when the sealing ring baffle is fixed on the needle shaft 11, the groove faces the first straight pipe 213, the sealing ring 131 is fixed in the groove and clings to the outer wall of the first straight pipe 213 to seal the gap between the needle shaft 11 and the first straight pipe 213; when the seal retainer is fixed to the outer wall of the first straight tube 213, the groove faces the needle shaft 11, and the seal 131 is fixed in the groove and closely contacts with the inner wall of the needle shaft 11 to seal the gap between the needle shaft 11 and the first straight tube 213.
The sealing ring baffle may be an integral structure (please refer to fig. 1), or may be a detachable structure (please refer to fig. 2 to fig. 7), and the present invention is not limited thereto. In order to facilitate replacement of the sealing ring 131, the sealing ring barrier of this embodiment is preferably detachable, that is, the sealing ring barrier includes a front barrier 132 and a rear barrier 133, and the front barrier 132 and the rear barrier 133 are detachably connected, such as being clamped or screwed. Preferably, in this embodiment, the front baffle 132 is sleeved (fixed) at the rear end of the needle rod 11, the rear baffle 133 is fixedly connected to the front baffle 132 by a thread, a groove facing the first straight tube 213 is formed between the front baffle 132 and the rear baffle 133, and the sealing ring 131 is embedded in the groove.
In this embodiment, the front end of the ablation needle is sealed by the sealing element 13, and the rear end is not used, and the specific structure is as follows:
as an embodiment, a rear end wall is fixedly arranged at the rear end of the second straight pipe 215, a muffler insertion hole and an air inlet pipe insertion hole are arranged on the rear end wall, and the muffler 22 is inserted into the heat insulation pipe 21 from the muffler insertion hole and is fixedly connected with the muffler insertion hole without a gap;
the air inlet pipe fitting 12 is inserted into the heat insulation pipe 21 from the air inlet pipe fitting insertion hole and extends to the front end of the needle bar 11, and the outer wall of the air inlet pipe fitting 12 is fixedly connected with the air inlet pipe fitting insertion hole without a gap.
As another example, the rear end of the second straight pipe 215 does not need to be provided with a rear end wall, and at the rear end of the second straight pipe 215, the air return pipe 22 and the outer wall of the air inlet pipe fitting 12 are directly fixed by seamless welding with the inner wall of the second straight pipe 215, that is, the gap between the outer wall of the air return pipe 22 and the air inlet pipe fitting 12 and the inner wall of the second straight pipe 215 is filled with solder.
In the present invention, the front end of the air inlet pipe 12 is fixed to the needle bar 11, and the rear end is fixed to the second straight pipe 215, but the needle bar 11 and the first straight pipe 213 are axially moved relatively, and therefore, the length of the air inlet pipe 12 must be flexible. In order to satisfy the flexibility of the air inlet pipe 12, the air inlet pipe 12 may have a certain flexibility, such as being made of a flexible material; also can make air inlet pipe fitting 12 have telescopic spring structure, the utility model discloses do not do specific restriction to this, the spring structure is preferably made to this embodiment, and at least one section like air inlet pipe fitting 12 is spring structure. Since the air inlet pipe fitting 12 includes the J-T groove 121, the finned tube 122 and the air inlet pipe 123, the front and rear ends of the finned tube 122 communicate with the J-T groove 121 and the air inlet pipe 123, respectively. In order to achieve the scalability of the air inlet pipe fitting 12, as an embodiment, a spring structure (a spring tube) may be added between the J-T groove 121 and the finned tube 122 or/and between the finned tube 122 and the air inlet pipe 123, and if a spring tube is connected between the J-T groove 121 and the finned tube 122, the spring tube is respectively communicated with the J-T groove 121 and the finned tube 122; if a spring tube is connected between the finned tube 122 and the air inlet pipe 123, the spring tube is respectively communicated with the finned tube 122 and the air inlet pipe 123.
As another embodiment, at least one section of the air inlet pipe 12 is wound into a spring structure 1212, and the spring structure 1212 can be stretched or compressed along with the axial movement of the needle bar 11 relative to the first straight pipe 213, which is described in detail below with reference to the drawings.
The air inlet pipe 12 includes a J-T slot 121, the J-T slot 121 is located at a front section of the air inlet pipe 12, and a front end of the J-T slot 121 is fixed at a front end of the needle bar 11, as an example, referring to fig. 2 and 3, the front section of the J-T slot 121 is wound into a spring structure 1212, the spring structure 1212 is always located in the needle bar 11 and at a front end of the heat insulation pipe 21, and the spring structure 1212 is always located in the target area 3 regardless of relative movement between the needle bar 11 and the heat insulation pipe 21; as another example, referring to FIGS. 4 and 5, the middle section of the J-T slot 121 is wound into a spring structure 1212, and the spring structure 1212 is located within the insulated tubing 21 regardless of the relative movement between the needle shaft 11 and the insulated tubing 21.
In this embodiment, orifice 1211 is located on J-T slot 121.
In this embodiment, the fixing member 2 further includes a mandrel 24, and the mandrel 24 is inserted from the rear end of the second straight tube 215; further, a mandrel insertion hole is formed in the rear end wall of the heat insulation pipe 21, the mandrel 24 is inserted into the heat insulation pipe 21 from the mandrel insertion hole, and the mandrel 24 and the mandrel insertion hole are fixedly connected without a gap.
The utility model discloses in, air inlet pipe fitting 12 can include the finned tube, also can not set up the finned tube, but acts as the finned tube through the spring structure, and concrete structure is as follows:
when the air inlet pipe fitting 12 comprises a finned tube, namely the air inlet pipe fitting 12 comprises a J-T groove 121, a finned tube 122 and an air inlet pipe 123, wherein the front end and the rear end of the finned tube 122 are respectively communicated with the J-T groove 121 and the air inlet pipe 123, the finned tube 122 is wound into a plurality of spiral coils, and the mandrel 24 penetrates through the spiral coils of the finned tube 122; the front or middle section of the J-T slot 121 is provided with a spring structure 1212, the specific structure of which is described above and will not be described herein.
When the air inlet pipe 12 does not include the finned tube 122, the spring structure 122 'serves as the finned tube 122, please refer to fig. 6 and 7, that is, the air inlet pipe 12 includes the J-T groove 121, the spring structure 122' and the air inlet pipe 123, the J-T groove 121 may be provided with the spring structure 1212, or may not be provided with the spring structure 1212, the present invention is not limited in particular, in this embodiment, the J-T groove 121 is not provided with the spring structure 1212, the front end and the rear end of the spring structure 122 'are respectively communicated with the J-T groove 121 and the air inlet pipe 123, the spring structure 122' is always located in the heat insulation tube 21, and the mandrel 24 passes through the spring structure 122', and fins are further provided on the outer side of the spring structure 122'.
Further, the spring structure 122' is a hollow tube made of stainless steel, spring steel, nitinol or other memory metal-like materials.
In the present embodiment, the intake pipe 123 is fixedly connected to the rear end wall of the second straight pipe 215 without a gap.
In the present invention, the fixing member 2 further includes a temperature measuring line 25, the temperature measuring line 25 passes through the mandrel 24 and extends forward through the inside of the heat insulation pipe 21, and a temperature measuring point 251 of the temperature measuring line 25 is located at the foremost end of the first straight pipe 213.
Further, the mandrel 24 is a hollow tubular structure, and the temperature measuring line 25 and the mandrel 24 are sealed by pouring glue.
The utility model discloses in, can directly manually operate adjusting part 1, make it can be for the fixed part motion, also can indirectly operate adjusting part 1 through adjusting the driving lever, the utility model discloses do not specifically limit this, this embodiment uses second kind of embodiment as the example and explains in detail, and concrete structure is as follows:
referring to fig. 2 to 10, the adjusting component 1 further includes an adjusting lever 14, and the fixing component 2 further includes a handle 23:
the handle 23 is wrapped on the outer side of the heat insulation pipe 21 and is fixedly connected with the heat insulation pipe 21, and in the embodiment, the shape of the handle 23 is matched with the shape of the heat insulation pipe 21. An adjusting groove 231 is formed in the side wall of the handle 23, the adjusting groove 231 is long-strip-shaped and is arranged along the axial direction of the needle rod 11, the adjusting shift lever 14 penetrates through the adjusting groove 231 and is fixedly connected with the needle rod 11, the adjusting shift lever 14 is pushed axially, the adjusting shift lever 14 drives the needle rod 11 to move axially relative to the first straight pipe 213, namely the adjusting shift lever 14 slides axially, and the adjusting shift lever 14 drives the whole adjusting part 1 to move axially relative to the fixing part 2.
When adjustment lever 14 is positioned at the rearmost end of adjustment slot 231, needle shaft 11 is positioned furthest rearward relative to first straight tube 213, at which point the length of target area 3 is at a minimum and the creation of ice balls from freezing is at a minimum. When the adjusting lever 14 is adjusted to the foremost end of the adjusting slot 231, the needle shaft 11 is extended to the foremost position relative to the first straight tube 213, and the length of the target area 3 is the largest, and the ice ball generated by freezing is the largest.
As an embodiment, when the shortest target area 3 is in the natural state (when the spring structure is in the natural state, the coil of the spring structure may be tightly wound without a gap, but the present invention is not limited thereto), when the target area 3 is lengthened, the spring structure is in the stretched state;
as another example, when the longest target region 3 is in the natural state (when the spring structure is in the natural state, gaps are formed between the spiral coils of the spring structure), and when the target region 3 is shortened, the spring structure is in the compressed state;
as a third embodiment, in the middle length of the target area 3, the spring structure is in a natural state (when the spring structure is in the natural state, gaps are formed between the spiral coils of the spring structure), the spring is in a tensile state when the target area 3 is adjusted to be long by the position of the middle target area 3, and the spring is in a compressive state when the target area 3 is adjusted to be short by the position of the middle target area 3.
In the present invention, please refer to fig. 8 to 10, a plurality of dead safety locking grooves are further disposed on the sidewall of the handle 23, the dead safety locking grooves are located outside the adjusting groove 231 and communicated therewith, and the adjusting shift lever 14 can be locked into the dead safety locking grooves to be fixed. The utility model discloses in, if the frictional force of the dynamic seal between needle bar 11 and the first straight tube 213 is enough big, when the doctor is curing patient, then needle bar 11 can not slide to first straight tube 213 now yet, consequently, under the sufficient big condition of frictional force between needle bar 11 and first straight tube 213, also can not carry on spacingly to adjusting shift lever 14 through the dead groove of safety lock, only rely on its frictional force can.
Further, the safety locking groove comprises a radial rotation groove 232 and a safety locking groove 233, the radial rotation groove 232 is located in the radial direction of the needle rod 11, and the radial rotation groove 232 is arranged outside the adjusting groove 231 and is communicated with the adjusting groove; the safety clamping groove 233 is positioned in the axial direction of the needle rod 11, and the safety clamping groove 233 is arranged outside the radial rotation groove 232 and communicated with the radial rotation groove; the adjusting deflector rod 14 is rotated along the circumferential direction of the handle 23 to the radial rotating groove 232, then the adjusting deflector rod 14 is axially moved to be clamped into the safety clamping groove 233, and the direction of the safety clamping groove 233 is the same as the direction of the spring force.
The utility model discloses in, through the dead groove of safety lock and the front and back end of air inlet pipe fitting 12 respectively with needle bar 11 and heat insulating tube 21 fixed connection's mode, ensured that needle bar 11 can not be washed out by high-pressure gas.
The utility model discloses do not limit to the shape of return bend 214, in this embodiment, return bend 214 is the camber pipe, the bend angle of arc pipe is 90, first straight tube 213 is perpendicular with second straight tube 215.
Claims (14)
1. An adjustable curved cryoablation needle comprising an adjustment member and a fixation member, the adjustment member being movable relative to the fixation member to adjust the length of a target area:
the fixing part comprises a heat insulation pipe and an air return pipe, the heat insulation pipe is a bent pipe, and the air return pipe is inserted from the rear end of the heat insulation pipe and is fixedly connected with the heat insulation pipe;
the adjusting component comprises a needle bar and an air inlet pipe fitting, and the needle bar is sleeved outside the front section of the heat insulation pipe and is in axial sliding connection with the heat insulation pipe; the air inlet pipe fitting is inserted into the needle bar from the rear end of the heat insulation pipe and extends into the needle bar, the air inlet pipe fitting is fixedly connected with the needle bar, and the needle bar is linked with the air inlet pipe fitting to adjust the length of the target area.
2. The curved adjustable cryoablation needle as claimed in claim 1, wherein a counterbore is provided in the needle tip of the needle shaft, the counterbore is communicated with the inside of the needle shaft, and the front end of the air inlet pipe is fixed in the counterbore; the air inlet pipe fitting is provided with a plurality of throttling holes which are always positioned in front of the heat insulation pipe; or the like, or, alternatively,
the outer wall of the air inlet pipe fitting is fixedly arranged on the inner wall of the needle rod, and the front end of the air inlet pipe fitting is provided with a throttling hole.
3. The curved adjustable cryoablation needle of claim 1 wherein said needle shaft is slidably received over and axially connected to said forward section of said insulated tube by a seal;
the air inlet pipe fitting is telescopic, the air inlet pipe fitting and the air return pipe are inserted from the rear end of the heat insulation pipe, and the outer walls of the air inlet pipe fitting and the air return pipe are fixedly connected with the rear end of the heat insulation pipe in a seamless mode.
4. The curved adjustable cryoablation needle of claim 3 wherein said sealing member comprises a sealing ring, said needle shaft or said forward section of said insulated tube having a groove for receiving said sealing ring, said sealing ring being movably sealed between said needle shaft and said forward section of said insulated tube; or the like, or, alternatively,
the sealing element comprises a sealing ring and a sealing ring baffle, the sealing ring baffle is fixedly arranged on the front section of the needle rod or the heat insulation pipe, a groove for accommodating the sealing ring is formed in the sealing ring baffle, and the sealing ring is movably sealed between the needle rod and the front section of the heat insulation pipe.
5. The curved adjustable cryoablation needle as claimed in claim 4, wherein the sealing ring retainer comprises a front retainer and a rear retainer, the front retainer is disposed at the rear end of the needle shaft, the rear retainer is fixedly connected to the front retainer by a screw thread, the front retainer and the rear retainer form the groove facing the front section of the heat insulation tube, and the sealing ring is embedded in the groove.
6. The curved adjustable cryoablation needle of claim 3 wherein at least a segment of said air inlet member is spring loaded, said spring loaded structure being capable of being stretched or compressed in response to axial movement of said needle shaft relative to said insulated tubing segment.
7. The curved adjustable cryoablation needle as claimed in claim 6, wherein the air inlet pipe comprises a J-T groove, a finned tube and an air inlet pipe, wherein the front end and the rear end of the finned tube are respectively communicated with the J-T groove and the air inlet pipe;
the front section of the J-T groove is wound into a spring structure, and the spring structure is always positioned in the needle rod and is positioned at the front end of the heat insulation pipe;
or the like, or, alternatively,
the middle section of the J-T groove is wound into a spring structure and is always positioned in the heat insulation pipe;
or the like, or, alternatively,
and a spring structure is communicated between the J-T groove and the finned tube or/and between the finned tube and the air inlet pipe, and the spring structure is a spring tube.
8. The curved adjustable cryoablation needle according to claim 7, wherein said retaining member further comprises a mandrel inserted through the rear end of said insulated tube, the outer wall of said mandrel being fixedly attached to the rear end of said insulated tube without a gap;
the finned tube is wound into a plurality of spiral coils, and the mandrel penetrates through the spiral coils of the finned tube.
9. The curved adjustable cryoablation needle as claimed in claim 6, wherein the air inlet tube comprises a J-T slot, a spring structure and an air inlet tube, the front end and the rear end of the spring structure are respectively communicated with the J-T slot and the air inlet tube, and fins are further disposed on the outer side of the spring structure;
the ablation needle further comprises a mandrel inserted from the rear end of the insulated tube, the mandrel passing through the helical turn of the spring structure.
10. The curved adjustable cryoablation needle according to claim 8 or 9, wherein the fixation member further comprises a temperature sensing wire extending through the shaft and forwardly through the interior of the tube, the temperature sensing point of the temperature sensing wire being located at the forwardmost end of the tube.
11. The curved adjustable cryoablation needle according to claim 1 further comprising an adjustment lever and a handle:
the handle wraps the outer side of the heat insulation pipe and is fixedly connected with the heat insulation pipe, an adjusting groove is formed in the side wall of the handle, the adjusting deflector rod penetrates through the adjusting groove and is fixedly connected with the needle rod, the adjusting deflector rod is pushed axially, and the adjusting deflector rod drives the needle rod to move axially relative to the front section of the heat insulation pipe.
12. The curved adjustable cryoablation needle as claimed in claim 11, wherein a plurality of safety locking slots are further formed in a sidewall of said handle, said safety locking slots are located outside and in communication with said adjustment slot, and said adjustment rod can be locked into said safety locking slots to be fixed.
13. The curved adjustable cryoablation needle according to claim 12, wherein said safety locking slot comprises a radial rotation slot and a safety locking slot, said radial rotation slot being located radially of said needle shaft, said radial rotation slot being disposed outside of and in communication with said adjustment slot; the safety clamping groove is positioned in the axial direction of the needle rod, and is arranged on the outer side of the radial rotating groove and communicated with the radial rotating groove;
and the adjusting deflector rod is rotated along the circumferential direction of the handle to the radial rotating groove, and then the adjusting deflector rod is axially moved to be clamped into the safety clamping groove.
14. The curved adjustable cryoablation needle of claim 1 wherein the thermally insulating tube has a straight forward section, an elbow section in the middle section and a straight rearward section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921319747.8U CN211131353U (en) | 2019-08-13 | 2019-08-13 | Curved adjustable cryoablation needle |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921319747.8U CN211131353U (en) | 2019-08-13 | 2019-08-13 | Curved adjustable cryoablation needle |
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| CN211131353U true CN211131353U (en) | 2020-07-31 |
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| CN201921319747.8U Active CN211131353U (en) | 2019-08-13 | 2019-08-13 | Curved adjustable cryoablation needle |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110478028A (en) * | 2019-08-13 | 2019-11-22 | 上海导向医疗系统有限公司 | A kind of curved adjustable freezing ablation needle |
-
2019
- 2019-08-13 CN CN201921319747.8U patent/CN211131353U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110478028A (en) * | 2019-08-13 | 2019-11-22 | 上海导向医疗系统有限公司 | A kind of curved adjustable freezing ablation needle |
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