CN109620470B - Replaceable artificial auditory ossicle prosthesis device - Google Patents
Replaceable artificial auditory ossicle prosthesis device Download PDFInfo
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- CN109620470B CN109620470B CN201811589586.4A CN201811589586A CN109620470B CN 109620470 B CN109620470 B CN 109620470B CN 201811589586 A CN201811589586 A CN 201811589586A CN 109620470 B CN109620470 B CN 109620470B
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/18—Internal ear or nose parts, e.g. ear-drums
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/18—Internal ear or nose parts, e.g. ear-drums
- A61F2002/183—Ear parts
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- Otolaryngology (AREA)
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- Oral & Maxillofacial Surgery (AREA)
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- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
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Abstract
The invention discloses a replaceable artificial auditory ossicle prosthesis device which comprises an elastic ear drum affinity piece, a crank, an elastic fixing pin and a base platform, wherein the elastic ear drum affinity piece is connected with the top end of the crank in a sliding mode, the bottom end of the crank is fixedly connected with the base platform through the elastic fixing pin, the elastic ear drum affinity piece is attached to an ear drum, and the base platform is fixed in a foot plate. Aiming at the problem that the hearing is reduced due to the separation, the breakage, the displacement and the like of the postoperative artificial ossicular prosthesis device, the elastic fixing pin is pulled out, the main body part is inserted, and the elastic fixing pin is inserted, so that the time and the workload of a doctor in the operation are greatly reduced; through the matching of the spherical structure at the lower end of the crank and the position of the base station, the self-adjustment is realized according to the heights of the auditory bones of different human bodies, and the time and the workload of doctors for cutting, polishing and the like are reduced; the invention can adjust the angle according to the difference of each eardrum.
Description
Technical Field
The invention relates to a replaceable artificial ossicular prosthesis device, and belongs to the technical field of implantable medical instruments in the otology department.
Background
Chronic otitis media is a common disease in the ear and can cause hearing loss and fatal complications. As early as the twentieth century, radical surgery was used to prevent fatal complications. With the development of surgical techniques and the intensive study of the sound transmission mechanism of the middle ear, otologists prefer to treat such diseases with functional surgery rather than radical surgery. Since in most cases not only the focus can be cleared from the middle ear and mastoid but also the hearing can be reconstructed, while the integrity of the ossicular chain is the basis for the acoustic transmission.
The ossicular chain replacement operation has high requirements on doctors, and the phenomena of postoperative artificial ossicle prolapse, fracture, displacement and the like can be caused under various conditions, so that the hearing is reduced. Therefore, the original artificial ossicle needs to be removed and taken out for the secondary operation, and complex operation procedures such as punching, measurement, cutting and the like are carried out, so that the invention provides the replaceable artificial ossicle prosthesis under the background of the complex technical defects in the prior art.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: how to solve the problem that the existing postoperative artificial auditory ossicle prosthesis is separated, broken, displaced and the like to cause hearing loss.
The prior art has the following solutions: the secondary operation is performed, the re-creation and the problem confirmation are performed, the old artificial ossicle is removed, the new artificial ossicle is implanted, and the like, which is equivalent to the operation being performed again, so that the workload of a doctor is increased, and the physiological and psychological influences of different layers are brought to a patient.
In contrast, the replaceable artificial ossicular prosthesis device provided by the invention has the advantages that when the conditions are met, a doctor only needs to replace the main body part of the replaceable artificial ossicular prosthesis device, and operations such as punching, measuring, cutting and the like are not needed. Still another advantage of the present invention is that the surgeon can implant directly without measuring and preparing multiple models during the first surgery, thereby reducing the surgeon's time and effort for the surgery. The product of the invention can be used for the failure of the first operation only by replacing the main body part.
The invention adopts the following technical scheme: the replaceable artificial auditory ossicle prosthesis device is characterized by comprising an elastic ear drum affinity piece, a crank, an elastic fixing pin and a base station, wherein the elastic ear drum affinity piece is in sliding connection with the top end of the crank, the bottom end of the crank is fixedly connected with the base station through the elastic fixing pin, the elastic ear drum affinity piece is attached to an ear drum, and the base station is fixed in a foot plate.
In a preferred embodiment, the elastic ear drum affinity sheet comprises an arc-shaped sheet body, and the surface of the arc-shaped sheet body is rounded and has no acute angle so as to prevent injury to human tissues during exercise or implantation.
As a preferred embodiment, the surface of the elastic eardrum affinity piece is provided with a plurality of conductive adsorption holes to reduce the weight and facilitate the sound conduction and the adsorption of the micro-suction tube.
As a preferred embodiment, the elastic ear drum affinity piece further comprises an upper end part of the piece body and a lower end part of the piece body, wherein the upper end part of the piece body is arc-shaped and is pressed against the eardrum so as to be convenient for the elastic ear drum affinity piece to be attached to the eardrum; the lower end of the sheet body is provided with a circle of spherical track, and the top end of the crank is embedded into the spherical track in a sliding manner and is connected with the lower end of the sheet body.
In a preferred embodiment, the crank is tapered so that the center of gravity of the crank is located at the lower root of the crank.
As a preferred embodiment, the crank comprises a conical handle body positioned in the center, an upper end part of the handle body positioned above and a lower end part of the handle body positioned below, wherein two ends of the conical handle body are fixedly connected with the upper end part of the handle body and the lower end part of the handle body respectively.
As a preferred embodiment, the upper end part of the handle body is hemispherical and fixedly connected with the elastic ear drum affinity piece; the lower end part of the handle body is spherical and is inserted into the base station to be rotationally connected with the base station.
As a preferred embodiment, the elastic fixing pin comprises a limiting column and pin columns which are symmetrically and fixedly connected with two ends of the limiting column, the elastic fixing pin is detachably connected with the base platform through the pin columns, and the limiting column is attached to the bottom end of the crank.
As a better embodiment, the base station comprises a base station body, wherein lower column rods which are distributed in bilateral symmetry are fixedly arranged at the bottom of the base station body, and the base station body is fixedly connected with a foot plate through the lower column rods; spherical crank hole has been seted up to the top of base station body, lies in spherical crank hole on the base station body and still sets up the side pinhole that is bilateral symmetry and distributes, and the base station passes through spherical crank hole and articulate bottom fixed connection, and the base station is dismantled with the elastic fixation pin through side pinhole and is connected.
In a preferred embodiment, the surface of the lower shaft is provided with a bone-friendly oxide layer to facilitate bonding to the foot plate.
The invention achieves the following beneficial effects: firstly, after the problem that the hearing is reduced due to the separation, the breakage, the displacement and the like of the postoperative artificial ossicular prosthesis device is solved, the operation is only initiated, the elastic fixing pin is pulled out, the main body part is inserted, and the elastic fixing pin is inserted, so that the time and the workload of a doctor in the operation are greatly reduced; secondly, the crank is rotated for 360 degrees through the matching of the spherical structure at the lower end of the crank and the position of the base station; therefore, the height of the main body part can be adjusted by self according to the heights of the auditory ossicles of different human bodies, and the height of the main body part can be adjusted by the spherical rotation of the root part of the crank along with different people, so that various types are not needed, and the time and the workload of doctors for cutting, polishing and the like are reduced; thirdly, the invention combines the elastic ear drum affinity piece through the semi-spherical upper R angle at the upper end of the crank, so that the angle can be adjusted according to different ear drums of each person, and the invention is beneficial to the attachment of the ear drums of human bodies and the conduction of sound.
Drawings
Fig. 1 is a schematic structural view of a preferred embodiment of the present invention.
FIG. 2 is a schematic view of the structure of the elastic ear drum affinity sheet of the present invention connected to a crank.
FIG. 3 is a schematic diagram of the structure of the elastic ear drum affinity sheet of the present invention.
Fig. 4 is a schematic view of the structure of the crank of the present invention.
Fig. 5 is a schematic view of the construction of the resilient fixation pin of the present invention.
Fig. 6 is a schematic structural view of the base of the present invention.
Fig. 7 is a schematic view of the preferred embodiment of the present invention implanted in a human body and conducted in sound.
Figure 8 is a schematic view of the principle of the failure of the replaceable artificial ossicular prosthesis device according to the present invention.
Fig. 9 is a schematic view of the elastic fixing pin being pulled out.
Fig. 10 is a schematic illustration of the principle of removing a damaged body portion.
Fig. 11 is a schematic view of the principle of replacing a new body portion.
Fig. 12 is a schematic view of the principle of inserting a new body portion into the abutment.
Fig. 13 is a schematic view showing the principle of replacing the base with the elastic fixing pin inserted therein.
FIG. 14 is a schematic height adjustment of the main structure of the crank and elastic ear drum affinity tablet.
Fig. 15 is a schematic view of the adjustment of the fit angle of the ear membrane to the elastic ear membrane affinity tablet.
The meanings of the symbols in the figures: 1-elastic ear drum affinity sheet, 2-crank, 3-elastic fixing pin, 4-base table, 5-ear drum, 6-foot plate, 7-external sound; 11-arc sheet body, 12-conduction adsorption hole, 13-upper end part of sheet body, 14-lower end part of sheet body, 15-spherical track; 21-a conical handle body, 22-the upper end part of the handle body and 23-the lower end part of the handle body; 31-a latch post, 32-a limit post; 41-base station body, 42-lower column rod, 43-oxide layer, 44-spherical crank hole and 45-side pin hole.
Detailed Description
The invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
Fig. 1 is a schematic structural diagram of a preferred embodiment of the present invention, and the present invention provides a replaceable artificial auditory prosthesis device, which includes an elastic ear drum affinity piece 1, a crank 2, an elastic fixing pin 3, and a base 4, wherein the elastic ear drum affinity piece 1 is slidably connected to the top end of the crank 2, the bottom end of the crank 2 is fixedly connected to the base 4 through the elastic fixing pin 3, the elastic ear drum affinity piece 1 is attached to an ear drum 5, and the base 4 is fixed in a foot plate 6.
Fig. 2 shows a schematic structure of the elastic ear drum affinity tablet of the present invention connected with a crank. As a preferred embodiment, the elastic ear drum affinity piece 1 comprises an arc-shaped piece body 11, the surface of the arc-shaped piece body 11 is rounded and has no acute angle so as to prevent injury to human tissues and the like in the process of movement or implantation; the diameter of the elastic eardrum affinity piece 1 is between 3mm and 5mm, which is beneficial to sound conduction.
As a preferred embodiment, the surface of the elastic ear drum affinity sheet 1 is provided with dense hemp conductive adsorption holes 12 to reduce weight and facilitate sound conduction and adsorption of a micro-suction tube.
Fig. 3 shows a schematic structure of the elastic ear drum affinity tablet of the invention. As a preferred embodiment, the elastic ear drum affinity piece 1 further comprises a piece body upper end part 13 and a piece body lower end part 14 which are positioned above, wherein the piece body upper end part 13 is arc-shaped and is pressed against the eardrum 5 so that the elastic ear drum affinity piece 1 is attached to the eardrum 5; a circle of spherical track 15 is arranged at the lower end part 14 of the sheet body, the top end of the crank 2 is embedded into the spherical track 15 in a sliding way and is connected with the lower end part 14 of the sheet body, and the spherical track 15 is used for connecting the crank 2 and preventing the crank 2 from falling off in the motion process; the crank can rotate in the track so as to adapt to the height of the position of the ossicles of different people.
As shown in figure 4, the crank of the present invention has a schematic structural view, and as a preferred embodiment, the crank 2 has a tapered shape with a thin upper part and a thick lower part, so that the center of gravity of the crank 2 is located at the lower end root of the crank 2, and the whole product is firmer and more stable during movement.
As a preferred embodiment, the crank 2 comprises a conical handle body 21 located at the center, an upper handle body end 22 located above, and a lower handle body end 23 located below, wherein both ends of the conical handle body 21 are fixedly connected with the upper handle body end 22 and the lower handle body end 23 respectively.
As a preferred embodiment, the upper end 22 of the handle body is hemispherical and fixedly connected in the spherical track 15 of the elastic ear drum affinity piece 1, and the hemispherical structure is favorable for the crank 2 to slide in the spherical track 15 without falling off; the lower end part 23 of the handle body is spherical and inserted into the base 4 to be rotatably connected with the base 4, and the lower end part 23 of the handle body of the crank 2 can rotate 180 degrees in the base 4, so that the phenomenon of falling off, breaking, giving a foreign body feeling and the like can be avoided along with swinging in the process of movement of a person.
As shown in fig. 5, which is a schematic structural diagram of the elastic fixing pin of the present invention, as a preferred embodiment, the elastic fixing pin 3 includes a limiting post 32 and two plug pins 31 symmetrically and fixedly connected to two ends of the limiting post 32, the elastic fixing pin 3 is detachably connected to the base 4 through the plug pins 31, and the limiting post 32 is attached to the bottom end of the crank 2; the elastic fixing pin 3 is inserted into the side pin hole 45 of the base 4 to prevent the crank 2 from falling off in the process of movement; the elastic fixing pin 3 has elasticity and can be deformed by external force such as compression and extension.
As shown in fig. 6, which is a schematic structural diagram of the base platform of the present invention, as a preferred embodiment, the base platform 4 includes a base platform body 41, lower posts 42 are fixedly disposed at the bottom of the base platform body 41, and the base platform body 41 is fixedly connected to the foot plate 6 through the lower posts 42; spherical crank hole 44 has been seted up to base station body 41's top, still sets up the side pinhole 45 that is bilateral symmetry distribution on the base station body 41 in the spherical crank hole 44, and base station 4 is connected through spherical crank hole 44 and crank 2's bottom fixed, and base station 4 is dismantled with elasticity fixed pin 3 through side pinhole 45 and is connected for fixed crank 2 prevents to drop.
In a preferred embodiment, the surface of the lower post 42 is provided with a bone-friendly oxide layer 43 to facilitate bonding with the foot plate 6, making the product of the present invention more robust.
As shown in fig. 7, which is a schematic diagram of the principle of implanting the preferred embodiment of the present invention into a human body and conducting sound, the elastic ear drum affinity piece 1 is connected with the ear drum 5, external sound vibrates through the ear drum 5 to cause the elastic ear drum affinity piece 1 to vibrate, and the external sound is conducted to the foot plate 6 through the crank 2 and the abutment 4 to play a role in conducting sound, and the operation process of a doctor in an operation process is as follows: the footplate 6 is perforated and the entire product structure is then implanted into the corresponding hole and other associated procedures.
As shown in fig. 8, firstly, the artificial ossicular prosthesis device is separated, broken, displaced and fails in the first operation; as shown in fig. 9, at this time, the elastic fixing pin 3 is pulled out first; as shown in fig. 10, after the elastic fixing pin 3 is pulled out, it is horizontally moved to one side to remove the main body part composed of the damaged elastic ear drum affinity piece 1 and the crank 2; as shown in fig. 11, a new elastic ear drum affinity piece 1 and the main body part formed by the crank 2 are taken out; as shown in fig. 12, the new main body portion of fig. 11 is inserted into the corresponding position of the base 4, i.e. the spherical crank body lower end 23 of the crank 2 is inserted into the spherical crank hole 44 of the base 4; as shown in fig. 13, the elastic fixing pin 3 is finally inserted into the side pin hole 45 corresponding to the base 4 and fixed.
As shown in FIG. 14, the main structure can rotate 360 degrees by the cooperation of the spherical structure at the lower end of the crank 2 and the position of the base 4; therefore, the height of the auditory ossicles of different human bodies can be adjusted by the user, and the adjusting range is 5mm-10 mm. H0When the whole main body structure is the highest, the height H of the main body part is adjusted by the spherical rotation of the root part of the crank 2 following different crowds1，H2.....Hn,HnWhen the height of the whole main structure is the lowest, multiple models are not needed, and the time and the workload of doctors for cutting, polishing and the like are reduced.
As shown in fig. 15, the angle of the elastic ear drum affinity sheet 1 can be adjusted according to the ear drum 5 of each person by the semicircular upper R angle of the upper end of the crank 2. Is beneficial to the attachment of the human eardrum 5 and the transmission of sound, the angle alpha of the elastic eardrum affinity piece 1 can be adjusted, wherein the alpha is more than or equal to 0 degree and less than or equal to 30 degrees.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (9)
1. The replaceable artificial auditory ossicle prosthesis device is characterized by comprising an elastic ear drum affinity piece (1), a crank (2), an elastic fixing pin (3) and a base station (4), wherein the elastic ear drum affinity piece (1) is in sliding connection with the top end of the crank (2), the bottom end of the crank (2) is fixedly connected with the base station (4) through the elastic fixing pin (3), the elastic ear drum affinity piece (1) is attached to an ear drum (5), and the base station (4) is fixed in a foot plate (6);
when the artificial ossicular prosthesis device is separated, broken and displaced and fails in the first operation, the elastic fixing pin (3) is firstly pulled out; after the elastic fixing pin (3) is pulled out, the elastic fixing pin horizontally moves to one side to remove a main body part formed by the damaged elastic eardrum affinity piece (1) and the crank (2); taking out a new main body part consisting of the elastic eardrum affinity piece (1) and the crank (2); then inserting a new main body part into the corresponding position of the base station (4); finally, the elastic fixing pin (3) is inserted into the base platform (4) for fixing;
the base platform (4) comprises a base platform body (41), lower column rods (42) which are distributed in bilateral symmetry are fixedly arranged at the bottom of the base platform body (41), and the base platform body (41) is fixedly connected with the foot plate (6) through the lower column rods (42); spherical crank hole (44) have been seted up to the top of base station body (41), lie in on base station body (41) still set up in spherical crank hole (44) and be the side pinhole (45) that bilateral symmetry distributes, base station (4) pass through spherical crank hole (44) with the bottom fixed connection of crank (2), base station (4) pass through side pinhole (45) with the connection is dismantled to elasticity fixed pin (3).
2. The replaceable artificial ossicular prosthesis device according to claim 1, wherein the elastic ear drum affinity sheet (1) comprises an arc-shaped sheet body (11), the surface of the arc-shaped sheet body (11) is rounded without acute angles to prevent injury to human tissue during exercise or implantation.
3. The replaceable artificial ossicular prosthesis device according to claim 1, wherein the surface of the elastic ear drum affinity sheet (1) is provided with a plurality of conductive adsorption holes (12) to reduce weight, facilitate sound conduction and adsorption of micro-suction tubes.
4. The replaceable artificial ossicular prosthesis device according to claim 1, wherein the elastic ear drum affinity sheet (1) further comprises a sheet upper end portion (13) and a sheet lower end portion (14) located above, the sheet upper end portion (13) being arc-shaped and abutting against the ear drum (5) so that the elastic ear drum affinity sheet (1) is attached to the ear drum (5); a circle of spherical track (15) is arranged at the lower end (14) of the sheet body, and the top end of the crank (2) is embedded into the spherical track (15) in a sliding manner and is connected with the lower end (14) of the sheet body.
5. The replaceable artificial ossicular prosthesis device according to claim 1, characterized in that the crank (2) is tapered with a thin upper part and a thick lower part, such that the center of gravity of the crank (2) is located at the lower root of the crank (2).
6. The replaceable artificial ossicular prosthesis device according to claim 1, wherein the crank (2) comprises a conical handle body (21) located at the center, an upper handle body end (22) located above, and a lower handle body end (23) located below, and both ends of the conical handle body (21) are fixedly connected with the upper handle body end (22) and the lower handle body end (23), respectively.
7. The replaceable artificial ossicular prosthesis device according to claim 6, wherein the handle upper end portion (22) is hemispherical and fixedly connected to the elastic ear drum affinity sheet (1); the lower end part (23) of the handle body is spherical and is inserted into the base platform (4) to be rotationally connected with the base platform (4).
8. The replaceable artificial ossicular prosthesis device according to claim 1, wherein the elastic fixing pin (3) comprises a limiting column (32) and plug columns (31) symmetrically and fixedly connected to two ends of the limiting column (32), the elastic fixing pin (3) is detachably connected to the base (4) through the plug columns (31), and the limiting column (32) is attached to the bottom end of the crank (2).
9. The replaceable artificial ossicular prosthesis device according to claim 1, wherein a surface of the lower post (42) is provided with a bone-friendly oxide layer (43) to facilitate bonding with the foot plate (6).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811589586.4A CN109620470B (en) | 2018-12-25 | 2018-12-25 | Replaceable artificial auditory ossicle prosthesis device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811589586.4A CN109620470B (en) | 2018-12-25 | 2018-12-25 | Replaceable artificial auditory ossicle prosthesis device |
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| CN109620470A CN109620470A (en) | 2019-04-16 |
| CN109620470B true CN109620470B (en) | 2021-07-23 |
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| CN201811589586.4A Active CN109620470B (en) | 2018-12-25 | 2018-12-25 | Replaceable artificial auditory ossicle prosthesis device |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112932736A (en) * | 2021-02-24 | 2021-06-11 | 苏州真懿医疗有限公司 | Adjustable ossicular prosthesis |
| CN113367841B (en) * | 2021-07-12 | 2022-08-16 | 中国人民解放军总医院第六医学中心 | Auditory ossicle prosthesis based on titanium periosteum |
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| EP2376185B1 (en) * | 2008-11-12 | 2016-03-30 | Advanced Bionics AG | Modular speech processor headpiece |
| ES2407868T3 (en) * | 2011-01-29 | 2013-06-14 | Heinz Kurz Gmbh Medizintechnik | Hearing aid for ossicular replacement with stabilizing element |
| DE102015113138B3 (en) * | 2015-08-10 | 2016-07-21 | Heinz Kurz Gmbh Medizintechnik | Laser-activated variable-length ossicle prosthesis |
| CN108756260A (en) * | 2018-07-27 | 2018-11-06 | 中冶建工集团有限公司 | A kind of spliced marked rod |
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| CN1382426A (en) * | 2002-02-28 | 2002-12-04 | 周星 | Artificial auditory ossicle made of marmem |
| CN101461743A (en) * | 2007-12-21 | 2009-06-24 | 海因茨·库兹医疗技术有限责任公司 | Modular middle ear total prosthetic |
| CN201160921Y (en) * | 2008-02-26 | 2008-12-10 | 王希军 | Fulltitanium ear ossicle |
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| CN108472132A (en) * | 2015-09-25 | 2018-08-31 | 恩特普斯公司 | The auditory ossicle prosthesis of adjustable length with low profile elastomeric joint |
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| CN109620470A (en) | 2019-04-16 |
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