CN112972866B - Shape memory catheter - Google Patents
Shape memory catheter Download PDFInfo
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- CN112972866B CN112972866B CN202110164372.8A CN202110164372A CN112972866B CN 112972866 B CN112972866 B CN 112972866B CN 202110164372 A CN202110164372 A CN 202110164372A CN 112972866 B CN112972866 B CN 112972866B
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- catheter
- shape
- temporary
- catheter body
- shape memory
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M25/00—Catheters; Hollow probes
- A61M25/0017—Catheters; Hollow probes specially adapted for long-term hygiene care, e.g. urethral or indwelling catheters to prevent infections
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M25/00—Catheters; Hollow probes
- A61M25/0021—Catheters; Hollow probes characterised by the form of the tubing
- A61M25/0041—Catheters; Hollow probes characterised by the form of the tubing pre-formed, e.g. specially adapted to fit with the anatomy of body channels
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M25/00—Catheters; Hollow probes
- A61M25/0067—Catheters; Hollow probes characterised by the distal end, e.g. tips
- A61M25/0074—Dynamic characteristics of the catheter tip, e.g. openable, closable, expandable or deformable
Abstract
The invention provides a shape memory catheter, and particularly relates to the field of medical instruments, wherein the shape memory catheter comprises a catheter body, and a drainage cavity is arranged in the catheter body; the catheter body comprises a two-way shape memory composite material, and further comprises an initial shape and a temporary shape; when the catheter body is stimulated by temperature, the catheter body is deformed from the initial shape to the temporary shape, part of the structure of the catheter body in the temporary shape is suitable for being fixed in a bladder and guiding urine out through the drainage cavity, and after the catheter body in the temporary shape is stimulated by the temperature again, the catheter body in the temporary shape is restored to the initial shape from the temporary shape. When the shape memory catheter is put into a patient, the discomfort of the patient is reduced, and when the shape memory catheter is used, the catheterization can be carried out only through the stimulation of temperature; when the shape memory catheter is taken out, the temperature stimulation is carried out again.
Description
Technical Field
The invention relates to the technical field of medical instruments, in particular to a shape memory catheter.
Background
In general, in the case of operation, a patient is unconscious, cannot urinate autonomously, or suffers from difficult urination, prostatic hypertrophy and urethral injury, and a catheter needs to be inserted. The existing catheters mainly have different models (different sizes), but are inconvenient to purchase in hospitals, and generally only one model is purchased to be matched with more patients as much as possible. Since the diameter of the catheter generally does not match the diameter of the patient's urethra, and the catheter is relatively stiff, it can cause discomfort to the patient when placed into the patient's urethra and can be very uncomfortable to the patient when removed.
Disclosure of Invention
The invention solves at least one of the technical problems that the prior catheter is not matched with the diameter of the urethra of a patient, has higher hardness and is uncomfortable for the patient when being put in or taken out.
In order to solve the problems, the invention provides a shape memory catheter, which comprises a catheter body, wherein a drainage cavity is arranged in the catheter body; the catheter body comprises a two-way shape memory composite material, and further comprises an initial shape and a temporary shape;
when the catheter body is stimulated by temperature, the catheter body is deformed from the initial shape to the temporary shape, part of the structure of the catheter body in the temporary shape is suitable for being fixed in a bladder and guiding urine out through the drainage cavity, and after the catheter body in the temporary shape is stimulated by the temperature again, the catheter body in the temporary shape is restored to the initial shape from the temporary shape.
Further, the temperature range for deforming the catheter body from the initial shape to the temporary shape is: 40-42 ℃; the temperature range for the catheter body to return from the temporary shape to the initial shape is: 45-47 ℃.
Further, the catheter body is made of a layer of two-way shape memory composite material.
Furthermore, the catheter body comprises a catheter bracket and a catheter from inside to outside, and two ends of the catheter are respectively connected with two ends of the catheter bracket.
Further, the catheter holder comprises a support part and a connecting part connected with the support part;
the supporting part and the connecting part are both deformed to the temporary shape after being stimulated by temperature, and the supporting part in the temporary shape is suitable for being fixed in the bladder; the temporarily shaped connection is adapted to dilate the urethra to allow the urine to drain;
and after being stimulated by temperature again, the temporary-shaped supporting part and the temporary-shaped connecting part are deformed to the initial shape, so that the catheter bracket is separated from the bladder.
Further, the diameter of the initial-shape connecting portion is smaller than the diameter of the temporary-shape connecting portion.
Further, the catheter includes a sleeve and a wrap connected to the sleeve; the sleeve is sleeved on the outer surface of the connecting part, and the wrapping part wraps the outer side of the supporting part.
Further, when the catheter bracket is deformed from the initial shape to the temporary shape after being stimulated by temperature, the catheter is deformed together with the catheter bracket under the supporting force of the catheter bracket;
when the temporary catheter bracket is subjected to the temperature stimulation again and then returns to the original shape from the temporary shape, the catheter and the catheter bracket return to the original shape together under the action of the elastic force of the catheter.
Further, the wrapping portion is provided with a urine guide outlet.
Further, the catheter holder and/or catheter is coated with a chondroitin sulfate or phosphorylcholine coating.
Compared with the prior art, the shape memory catheter can reduce the discomfort of a patient when being placed in the body of the patient, and can realize catheterization only through temperature stimulation when the shape memory catheter is used; when the shape memory catheter is taken out, the temperature stimulation is carried out again.
Drawings
FIG. 1 is a view showing a configuration of an initial shape of a first embodiment of the present invention;
FIG. 2 is a block diagram of an initial shape of a catheter holder according to a first embodiment of the invention;
fig. 3 is a view showing a configuration of a temporary shape of a catheter body according to a first embodiment of the present invention;
FIG. 4 is a block diagram of a temporary shape of a catheter holder according to a first embodiment of the invention;
fig. 5 is a view showing a configuration of an initial shape of a catheter body according to a second embodiment of the present invention;
FIG. 6 is a block diagram of an initial shape of a catheter holder according to a second embodiment of the invention;
fig. 7 is a view showing a temporary shape of a catheter body according to a second embodiment of the present invention;
FIG. 8 is a block diagram of a temporary shape of a catheter holder according to a second embodiment of the invention;
FIG. 9 is a block diagram of an initial shape of a catheter body according to a third embodiment of the invention;
FIG. 10 is a view showing a configuration of a catheter holder in an initial shape according to a third embodiment of the invention;
FIG. 11 is a block diagram of a temporary shape of a catheter body according to a third embodiment of the invention;
FIG. 12 is a block diagram of a temporary shape of a catheter holder according to a third embodiment of the invention.
Description of reference numerals:
1-a catheter; 2-a catheter holder; 3-a drainage cavity; 11-a sleeve; 12-a wrapping section; 21-a connecting part; 22-a support; 121-a urine drain; 122-a first fitting part; 123-an outlet hole; 221-a fixing piece; 222-a first support frame; 223-second support.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the description of embodiments of the invention, the description of the term "some embodiments" means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same implementation or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
It should be noted that unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly and include, for example, fixed or removable connections or integral connections; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
For a better understanding of the invention, without limiting its scope, all numbers expressing quantities, percentages, and other numerical values used in the present invention are to be understood as being modified in all instances by the term "about". Accordingly, unless indicated otherwise, the numerical parameters set forth in the specification and attached claims are approximations that may vary depending upon the desired properties sought to be obtained. At the very least, each numerical parameter should at least be construed in light of the number of reported significant digits and by applying ordinary rounding techniques.
With combined reference to fig. 1-12, the invention provides a shape memory urinary catheter, which comprises a urinary catheter body, wherein a drainage cavity 3 is arranged in the urinary catheter body; the catheter body comprises a two-way shape memory composite material, and also comprises an initial shape and a temporary shape; when the catheter body is stimulated by temperature, the catheter body deforms from the initial shape to the temporary shape, part of the structure of the catheter body in the temporary shape is suitable for being fixed in the bladder and guiding urine out through the drainage cavity 3, and after the catheter body in the temporary shape is stimulated by the temperature again, the catheter body returns to the initial shape from the temporary shape. The shape memory catheter of the embodiment can reduce the discomfort of a patient when being put into the body of the patient, and can realize catheterization only by temperature stimulation when the shape memory catheter is used; when the shape memory catheter is taken out, the temperature stimulation is carried out again.
It should be noted that the two-way shape memory composite material adopted in the present embodiment has moderate hardness. And the initial shape is the shape fixed after the preparation of the catheter body is finished, and the temporary shape is the shape after the stimulation of the temperature. In particular, the two-way shape memory composite material can be a shape memory composite material capable of realizing two-way deformation by selecting shape memory polydimethylsiloxane or other shape memory siloxanes or shape memory polymethyl methacrylate or other shape memory acrylate or shape memory polyurethane elastomer or other shape memory polyurethane or multi-material combination.
More specifically, the temperature range for deforming the catheter body from the initial shape to the temporary shape is: 40-42 ℃; the temperature range for the catheter body to return from the temporary shape to the initial shape is as follows: 45-47 ℃. When the catheter body is prepared, the shape of the catheter body can be fixed twice at 40-42 ℃ and 45-47 ℃, the specific preparation method can be adjusted according to the actually selected material, and the preparation method of the catheter body is not particularly limited in this embodiment. When the temporary urethral catheter is used, the initially-shaped urethral catheter body is inserted into a urethra, warm water of 40-42 ℃ is passed through the drainage cavity 3, so that the initially-shaped urethral catheter body is deformed into the temporarily-shaped urethral catheter body, and part of the temporarily-shaped urethral catheter body can be fixed in a bladder to prevent the urethral catheter body from falling out of the urethra; when the catheter body is ready to be removed, warm water at 45-47 ℃ is passed through the drainage cavity 3 again to restore the temporary-shaped catheter body to the original-shaped catheter body.
The normal body temperature of a human body is 35-37 ℃, and the temperature is difficult to exceed 41 ℃ even if the human body is burnt at a high temperature, so the temperature of the bidirectional deformation of the catheter body is stable; moreover, the temperature (40-47 ℃) of the bidirectional deformation is also in a range which can be borne by human bodies, so that the problems of human body discomfort and the like can not be caused.
The catheter body can be directly prepared from a layer of bidirectional shape memory composite material, and is the catheter bracket 2. When the catheter bracket 2 is stimulated by temperature, the initial shape is changed into a temporary shape, part of the structure of the catheter bracket 2 in the temporary shape is suitable for being fixed in the bladder and guiding urine out through the drainage cavity 3, and the catheter bracket 2 in the temporary shape is restored to the initial shape from the temporary shape after being stimulated by the temperature again. In some preferred embodiments, the catheter body can further comprise a catheter bracket 2 and a catheter 1 from inside to outside, and two ends of the catheter 1 are respectively connected with two ends of the catheter bracket 2; aim at, when the catheter support 2 of being convenient for is deformed, the pipe 1 takes place deformation along with the deformation of catheter support 2 together.
Specifically, the catheter 1 is made of a thin film or a soft silicone rubber film, and has great elasticity; and when in use, the catheter bracket 2 and the catheter 1 are soft in hardness, so that the catheter bracket 2 can be ensured to directly enter the urethra, and the patient is not easy to feel uncomfortable.
The catheter holder 2 comprises a support part 22 and a connecting part 21 connected with the support part 22; the supporting part 22 and the connecting part 21 are both deformed to a temporary shape after being stimulated by temperature, and the supporting part 22 in the temporary shape is suitable for being fixed in the bladder; the temporarily shaped connection 21 is adapted to dilate the urethra to allow urine to drain; after being subjected to the temperature stimulus again, the temporary-shaped support portion 22 and the temporary-shaped connecting portion 21 are both deformed to their original shapes, so that the catheter body is detached from the urethra.
Specifically, the supporting portion 22 can replace a conventional balloon and be fixed in the bladder, the conventional balloon needs to be inflated by external "water" or "gas", the balloon is ruptured when the balloon is filled with "water" or "gas" too much at one time, the rupture of the balloon easily causes the balloon to be embedded in the urethra, so that hematuria is caused after the urethral mucosa is damaged, and the physical and mental effects of a patient are serious.
The shape of the connecting portion 21 can be various, and can be set according to the actual situation, preferably, when the catheter is further arranged on the outer surface of the catheter holder 2, the connecting portion 21 in this embodiment is a three-dimensional net structure, and the connecting portion 21 in the three-dimensional net structure has a lighter volume compared with a solid structure, is not easy to cause burden on a patient when placed in a human body, and has less induction. The three-dimensional network-structured connection part 21 can also effectively support the urethra, and since the connection part 21 is also made of the shape memory composite material, any reaction with urine does not occur and the three-dimensional network-structured connection part 21 does not allow urate to be deposited for a long time. It should be noted that, since the connection portion 21 of the present embodiment has a three-dimensional network structure, even when stones are discharged from the body, the catheter 1 is not easily scratched due to the obstruction of the three-dimensional network structure.
Preferably, the supporting portion 22 and the connecting portion 21 may be integrally formed, which is easy to manufacture and convenient to use.
The diameter range of the catheter holder 2 in its initial shape is: 2-7mm; preferably, the diameter of the catheter bracket 2 in the initial shape is 4mm, and the aim is that the diameter of the catheter bracket 2 in the initial shape is smaller than the diameter of the urethra of the human body, so that the uncomfortable feeling can be reduced when the catheter bracket is placed into the urethra of the human body, and the tension of a patient can be relieved.
The diameter of the connection portion 21 in the initial shape is smaller than the diameter of the connection portion 21 in the temporary shape. Since the connection part 21 of the initial shape is convenient to be put into the urethra of the human body and reduces the discomfort of the patient, the diameter of the connection part 21 of the initial shape is set to have a small urination speed, after the stimulation of the temperature, the diameter of the connection part 21 of the initial shape is gradually increased until the connection part 21 of the temporary shape is attached to the urethra, and the diameter range of the connection part 21 of the temporary shape can make the urination speed normal, of course, this part is only directed to the setting of the connection part 21, and the urination speed also needs to be comprehensively calculated by combining the shape of the support part 22 and the shape of the connection part 21.
The catheter 1 comprises a sleeve 11 and a wrapping part 12 connected with the sleeve 11; the sleeve 11 is sleeved on the outer surface of the connecting part 21, and the wrapping part 12 wraps and supports the outer side of the supporting part 22. Thereby being convenient for preventing urine from leaking.
Specifically, the sleeve 11 is hollow and tubular, the sleeve 11 can be directly disposed on the outer circumferential surface of the connecting portion 21, and the sleeve 11 and the wrapping portion 12 are integrally formed to prevent urine leakage. It should be noted that the lengths of the sleeve 11 and the connecting portion 21 in this embodiment may be set by themselves, and preferably, the length of the sleeve 11 is slightly smaller than the length of the connecting portion 21, so that the sleeve 11 can completely wrap the connecting portion 21. Since the urinary catheters are inserted into different depths between a male and a female, the female is usually inserted into 4-6cm, while the male is inserted into about 20-22cm, and therefore, the lengths of the sleeve 11 and the connecting part 21 may be set according to the sex of the actual user.
It should be noted that the urethra of the child is smaller than that of the adult in both length and diameter, so the diameter and length of the catheter body 1 can be set by the urethra of the child.
When the catheter bracket 2 is stimulated by temperature and is deformed from the initial shape to the temporary shape, the catheter 1 and the catheter bracket 2 are deformed together under the supporting force of the catheter bracket 2; when the temporary catheter bracket 2 is stimulated by temperature again and then returns to the original shape from the temporary shape, the catheter 1 and the catheter bracket 2 restore to the original shape together under the action of the elastic force of the catheter 1.
More specifically, when the catheter holder 2 is deformed from the initial shape to the temporary shape, because the catheter 1 is made of a thin film or a soft silicone rubber film and has great elasticity, the catheter 1 can be expanded under the action of the supporting force (from inside to outside) generated in the deformation process of the catheter holder 2, and because the supporting force generated in the deformation process is within the bearing range of the catheter 1, the integrity of the catheter 1 can be ensured; when the temporary catheter bracket 2 is stimulated by temperature again, the temporary catheter bracket 2 is restored to the original shape, but the acting force of the supporting force (from outside to inside) generated in the deformation process of the catheter bracket 2 is opposite to that generated when the original shape is deformed into the temporary shape, and any acting force cannot be generated on the catheter 1, but the catheter 1 and the temporary catheter bracket 2 can restore to the original shape together under the action of the elastic force of the catheter 1.
The wrapping portion 12 is provided with a urine guide outlet 121. The urine convenient to enter the drainage cavity 3 through the urine guide outlet and flows out of the drainage cavity 3.
It should also be noted that the cannula 11 may be connected to a catheter (not shown) whose other end is connected to a urine bag for collecting urine. The specific connection mode of the catheter can be the same as the existing arrangement mode, and particularly, the catheter can be arranged by self.
The outer surface of the catheter bracket 2 and/or the catheter 1 is coated with a chondroitin sulfate or phosphorylcholine coating. The retention time of the short-term retention catheterization of a human body is generally 24 hours, and for a patient who retains the catheterization for a long time, the catheterization patient can be intubated for many times, so that the cost is increased, and the pain of the patient and the occurrence of urinary tract cross infection are increased. However, the chondroitin sulfate or choline phosphate coating is coated on the outer surface of the catheter stent 2 and/or the catheter 1 in the embodiment, so that the retention time can be prolonged, and in combination with the characteristic that the catheter in the embodiment can be deformed in two directions, even if the catheter is inserted for many times, no pain is caused to a patient, and because the chondroitin sulfate or choline phosphate coating is coated on the outer surface of the catheter stent 2 and/or the catheter 1 in the embodiment, the chondroitin sulfate and choline phosphate have anti-inflammatory effects, so that the risk of urinary tract cross infection is further reduced.
Furthermore, the shape of the supporting portion 22 may include various shapes of the wrapping portion 12 corresponding to the supporting portion 22, but the shape of the supporting portion 22 needs to be adapted to the shape of the wrapping portion 12, so as to achieve the purpose of bidirectional deformation, and the supporting portion can be fixed in the bladder in a temporary shape.
In this embodiment, the supporting portion 22 and the wrapping portion 12 corresponding to the supporting portion 22 mainly have the following three embodiments:
the first embodiment:
FIG. 2 is a view showing the configuration of the catheter holder 2 in its initial shape; the supporting part 22 in the initial shape is a cylinder with two through ends, the head of the cylinder is arc-shaped, and the tail of the cylinder is in through connection with the connecting part 21; in the embodiment, the supporting portion 22 and the connecting portion 21 are three-dimensional net structures, so the supporting portion 22 further includes fixing members 221, and the fixing members 221 are fixed to the three-dimensional net structures that are crossed and connected to each other, so as to prevent scratching the urinary bladder. The fixing parts 221 are also made of a two-way memory composite material, when in an initial shape, the fixing parts 221 are close to each other to be in a furled state, so that the fixing parts can be conveniently put into a urethra, meanwhile, as shown in fig. 1, fig. 1 is an initial shape structure diagram of a catheter body, as can be seen from the initial shape structure diagram of the catheter, the wrapping part 12 is a cylinder with two through ends, and the tail part of the cylinder is communicated with the sleeve 11; in this embodiment, the head of the cylinder is provided with a urine outlet 121, which is convenient for urine to be discharged, and the head of the cylinder wraps the plurality of fixing members 221 to prevent the fixing members from scratching the urethra when entering the urethra.
When the catheter bracket 2 is stimulated by temperature, the initial shape is deformed into a temporary shape; FIG. 4 is a view of the catheter holder 2 in a temporary configuration; the catheter matched with the catheter is deformed together under the supporting force of the catheter bracket 2, as shown in fig. 3, fig. 3 is a structural diagram of a temporary-shaped catheter body; the temporary support part 22 is in a horn shape with two open ends, and the temporary fixing part 221 is changed from a folded state to an unfolded state and is fixedly connected with the wrapping part 12; the wrapping portion 12 is expanded by the supporting force of the supporting portion 22, the expanded shape is the same as the shape of the temporary-shaped supporting portion 22, and the edge of one side of the wrapping portion 12 away from the sleeve 11 is arc-shaped, so that the bladder is damaged. Thereby, the whole catheter is fixed in the bladder to prevent the catheter from falling off. The diameter of the sleeve 11 is gradually increased from the original 3-6mm to be similar to the diameter of the urethra of the human body under the supporting force of the connecting part 21. At this time, urine in the bladder enters from the packing portion 12 and is left through the sleeve 11 to the catheter or the urinary bag.
When the temporary catheter bracket 2 is stimulated by temperature again, the temporary catheter bracket 2 is deformed into the catheter body with the initial shape, and the catheter body can be removed from the urethra.
The second embodiment:
FIG. 6 is a view showing the configuration of the catheter holder 2 in its initial shape; the supporting part 22 comprises a plurality of first supporting frames 222, the first supporting frames 222 are in a hollow arc-shaped structure, and the plurality of first supporting frames 222 are folded towards the center when in an initial shape, so that the urethra can be conveniently placed into the supporting part, and discomfort is reduced; meanwhile, as shown in fig. 5, fig. 5 is a structural view of the initial shape of the catheter body, and as can be seen from fig. 5, the wrapping portion 12 includes a plurality of first attaching portions 122, the number of the first attaching portions 122 is the same as that of the first support frames 222, and gaps are provided between the plurality of first attaching portions 122 to prevent the deformation processes from interfering with each other. The packing part 12 further includes a urine guide outlet 121.
When the catheter bracket 2 is stimulated by temperature, the initial shape is deformed into a temporary shape; FIG. 8 is a view of the catheter holder 2 in a temporary configuration, as shown in FIG. 8; the catheter 1 matched with the catheter is deformed together under the supporting force of the catheter bracket 2, as shown in fig. 7, fig. 7 is a structural diagram of a temporary-shaped catheter body; the temporary-shaped support portion 22 is formed like a "petal shape" by a plurality of first support frames 222, and the first support frames 222 are bent toward one side of the connection portion 21 and respectively attached to the first attaching portions 122. The first bonded portion 122 is spread by the supporting force of the first support frame 222, and the spread shape is the same as the shape of the temporary-shaped support portion 22. Thereby, fix whole catheter in the bladder, prevent that the catheter from deviating from. In order to avoid scratching the bladder, the first support frame 222 and the end of the first bonding portion 122 are both arc-shaped. The diameter of the sleeve 11 is gradually increased from the original 3-6mm to be similar to the diameter of the urethra of the human body under the supporting force of the connecting part 21. At this time, urine in the bladder enters from the package portion 12 and is retained by the sleeve 11 to the catheter or the urinary bag.
When the temporary catheter bracket 2 is stimulated by temperature again, the temporary catheter bracket 2 is deformed into the initial catheter bracket 2, and then the catheter can be removed from the urethra.
It should be noted that the number of the first support frames 222 and the first attaching portions 122 in this embodiment may be set according to the diameter of the urethra.
Third embodiment:
FIG. 10 is a view showing the configuration of the catheter holder 2 in its initial shape; the supporting part 22 comprises a plurality of second supporting frames 223, the second supporting frames 223 are arc-shaped frames, and under the initial shape, the plurality of supporting frames 223 jointly form a shape similar to a bullet head; meanwhile, as shown in fig. 9, fig. 9 is a view showing an initial shape of the catheter body, and as can be seen from fig. 9, the wrapping portion 12 wraps the second support frame 223 completely, and is provided with a plurality of outlet holes 123 for facilitating urine to be discharged.
When the catheter bracket 2 is stimulated by temperature, the initial shape is deformed into a temporary shape; FIG. 12 is a block diagram of the catheter holder 2 in a temporary configuration; the radian of the temporary-shaped second support frame 223 is reduced, and the catheter 1 matched with the temporary-shaped second support frame is deformed jointly under the supporting force of the catheter bracket 2, as shown in fig. 11, fig. 11 is a structural diagram of the temporary-shaped catheter; the wrapping part 12 and the sleeve 11 form a shape similar to a microphone under the action of supporting force; urine is left from the drainage cavity 3 after flowing into from the guide-out hole 3. The temporary wrapping part 12 and the sleeve 11 fix the whole catheter in the bladder to prevent the catheter from falling off. The diameter of the sleeve 11 is gradually increased from the original 3-6mm to be similar to the diameter of the urethra of the human body under the supporting force of the connecting part 21. At this time, urine in the bladder enters from the packing portion 12 and is left through the sleeve 11 to the catheter or the urinary bag.
When the temporary catheter bracket 2 is stimulated by the temperature again, the temporary catheter bracket 2 is deformed into the initial catheter bracket 2, and the urethral catheter can be removed from the urethra.
In addition, the number of the second support frames 223 and the first attachment portions 122 in the present embodiment may be set according to the diameter of the urethra.
Although the present disclosure has been described above, the scope of the present disclosure is not limited thereto. Various changes and modifications may be made by those skilled in the art without departing from the spirit and scope of the present disclosure, and these changes and modifications are intended to fall within the scope of the present disclosure.
Claims (8)
1. A shape memory catheter is characterized by comprising a catheter body, wherein a drainage cavity (3) is arranged in the catheter body; the catheter body comprises a two-way shape memory composite material, and further comprises an initial shape and a temporary shape;
when the catheter body is stimulated by temperature, the catheter body is deformed from the initial shape to the temporary shape, part of the structure of the catheter body in the temporary shape is suitable for being fixed in the bladder and guiding urine out through the drainage cavity (3), and after the catheter body in the temporary shape is stimulated by the temperature again, the catheter body in the temporary shape is restored to the initial shape from the temporary shape;
the catheter body comprises a catheter bracket (2) and a catheter (1) from inside to outside, and two ends of the catheter (1) are respectively connected with two ends of the catheter bracket (2);
the catheter bracket (2) comprises a supporting part (22) and a connecting part (21) connected with the supporting part (22), wherein the connecting part (21) is of a three-dimensional net structure;
the support part (22) and the connecting part (21) are both deformed to the temporary shape after being stimulated by temperature, and the support part (22) with the temporary shape is suitable for being fixed in the bladder; the temporarily shaped connection (21) is adapted to dilate the urethra to allow the urine to drain;
after being stimulated by temperature again, the temporary-shaped supporting part (22) and the temporary-shaped connecting part (21) are deformed to the initial shape, so that the catheter body is separated from the urethra.
2. The shape memory urinary catheter according to claim 1, wherein the temperature range at which the catheter body is deformed from the initial shape to the temporary shape is: 40-42 ℃; the temperature range for the catheter body to return from the temporary shape to the initial shape is: 45-47 ℃.
3. The shape memory urinary catheter according to claim 1, wherein the catheter body is made of a layer of a two-way shape memory composite material.
4. A shape memory urinary catheter according to claim 1, characterized in that the diameter of the initially shaped connection portion (21) is smaller than the diameter of the temporarily shaped connection portion (21).
5. A shape memory urinary catheter according to claim 1, characterized in that the catheter (1) comprises a sleeve (11) and a package (12) connected to the sleeve (11); the sleeve (11) is sleeved on the outer surface of the connecting part (21), and the wrapping part (12) wraps the outer side of the supporting part (22).
6. A shape memory urinary catheter according to claim 1 or 5, characterized in that, when the catheter holder (2) is deformed from the initial shape to the temporary shape after being stimulated by temperature, the catheter (1) is deformed together with the catheter holder (2) by the supporting force of the catheter holder (2);
when the temporary catheter bracket (2) is stimulated by temperature again and then returns to the original shape from the temporary shape, the catheter (1) and the temporary catheter bracket (2) return to the original shape together under the action of the elastic force of the catheter (1).
7. A shape memory urinary catheter according to claim 5, characterized in that the package (12) is provided with a urine outlet (121).
8. A shape memory urinary catheter according to claim 1, characterized in that the catheter holder (2) and/or catheter (1) is coated with a chondroitin sulfate or phosphocholine coating.
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| CN202110164372.8A CN112972866B (en) | 2021-02-05 | 2021-02-05 | Shape memory catheter |
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| CN202110164372.8A CN112972866B (en) | 2021-02-05 | 2021-02-05 | Shape memory catheter |
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| CN112972866A CN112972866A (en) | 2021-06-18 |
| CN112972866B true CN112972866B (en) | 2023-04-07 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0730848A2 (en) * | 1995-03-06 | 1996-09-11 | Willy Rüsch Ag | Stent for placement in a body tube |
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| EP0730848A2 (en) * | 1995-03-06 | 1996-09-11 | Willy Rüsch Ag | Stent for placement in a body tube |
| CN1633264A (en) * | 2002-01-28 | 2005-06-29 | 奥勃斯医学技术股份有限公司 | Flared ostial endoprosthesis and delivery system |
| KR102084621B1 (en) * | 2018-09-19 | 2020-03-04 | 인제대학교 산학협력단 | Catheter having a distal tip converted the shape |
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| CN112972866A (en) | 2021-06-18 |
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