CN108888385B - Restoration body reparation method based on skin soft tissue deformation - Google Patents
Restoration body reparation method based on skin soft tissue deformation Download PDFInfo
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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
- A61F2/10—Hair or skin implants
- A61F2/105—Skin implants, e.g. artificial skin
Abstract
A restoration body reparation method based on skin soft tissue deformation belongs to the field of plastic surgery research. The invention establishes a restoration body re-repairing method for a similar plane body restoration body and a non-plane body restoration body respectively; a planar prosthesis: the prosthesis specifically comprises a forehead prosthesis and a temple prosthesis, wherein the non-planar prosthesis comprises: comprises a nasal prosthesis; implanting the plane-like prosthesis to uniformly reduce the thickness of the skin soft tissue at the implanted part, calculating the thickness variation of the skin soft tissue before and after implantation by using the condition of constant volume of the skin soft tissue, and repairing by using the thickness variation of the skin soft tissue; the non-planar prosthesis is similar to the planar prosthesis and has the folding result, and the prosthesis repairing method includes calculating the change of the skin soft tissue stress caused by the folding of the implanted prosthesis based on the similar planar prosthesis repairing method and utilizing the stress change to repair the prosthesis for the second time. The invention solves the problem of influence on the shape restoration effect due to skin soft tissue deformation.
Description
Technical Field
The invention belongs to the field of plastic surgery research, and relates to a calculation method for calculating deformation and stress of human skin soft tissue caused by prosthesis implantation and a calculation method for repairing the prosthesis again by using the deformation and stress change of the skin soft tissue.
Background
Plastic surgery is a surgical method or a tissue transplantation method, which is used for repairing, prolonging and reconstructing defects and deformities of tissues and organs of a human body and reforming the shape of a normal human body to achieve shape improvement, beautification and functional reconstruction.
Prosthesis implantation is a common method of orthopedic surgery. After the prosthesis is implanted into the skin soft tissue of the human body, the skin soft tissue of the human body can deform and cause the stress change of the skin soft tissue, and the influence of the deformation and the stress change on the repairing effect cannot be ignored. However, in the current simulation system for the repairing effect of plastic repairing operation, the thickness of the skin soft tissue is generally considered to be unchanged before and after the prosthesis is implanted.
The method for repairing the prosthesis again based on the deformation of the skin soft tissue of the human body is provided, the prosthesis is repaired again by utilizing the deformation of the skin soft tissue generated by the implantation of the prosthesis and the stress change of the skin soft tissue caused by the deformation of the skin soft tissue, and the influence of the deformation of the skin soft tissue on the repairing effect is solved.
Disclosure of Invention
In order to overcome the influence of skin soft tissue deformation in a plastic repair effect simulation system, the invention provides a repair body re-repairing method based on skin soft tissue deformation. Relates to the deformation calculation and the mechanical parameter calculation of human skin soft tissue caused by the implantation of the prosthesis, and a calculation method for repairing the prosthesis by using the results of the deformation calculation and the mechanical parameter calculation, and solves the problem of the influence of the deformation of the skin soft tissue on the deformation repairing effect.
The technical scheme adopted by the restoration re-repairing method based on skin soft tissue deformation is as follows: respectively establishing a restoration re-repairing method for the similar planar restoration and the non-planar restoration, and re-repairing the restoration.
The technical scheme adopted by the planar prosthesis re-repairing method is as follows: the implantation of the plane-like prosthesis enables the thickness of the skin soft tissue at the implanted part to be uniformly reduced, the thickness variation of the skin soft tissue before and after the implantation is calculated by utilizing the condition that the volume of the skin soft tissue is constant, and the implanted prosthesis is repaired by utilizing the thickness variation of the skin soft tissue.
The technical scheme adopted by the non-planar restoration re-repairing method is as follows: the non-planar prosthesis (such as a nose prosthesis) is similar to the result of the planar prosthesis which is folded back, and the prosthesis repairing method is based on the plane-like prosthesis repairing method, and calculates the secondary deformation of the skin soft tissue caused by the implant folding back and the influence of the corresponding skin soft tissue mechanical parameters, and carries out secondary repair on the repair replacement by using the mechanical parameter change.
Compared with the prior art, the invention has the beneficial effect of designing the restoration re-repairing method based on the skin soft tissue deformation. The prosthesis is repaired again by using the skin soft tissue deformation generated by the implantation of the prosthesis and the change of the skin soft tissue mechanical parameters generated by the deformation, thereby solving the influence of the skin soft tissue deformation on the overall shape repair effect.
The technical scheme of the invention has the following advantages: the method fully considers the skin soft tissue deformation generated by the prosthesis implantation, quantifies the skin soft tissue deformation, provides a quantitative relational expression of the skin soft tissue thickness change before and after the prosthesis implantation, establishes the prosthesis re-repairing method based on the skin soft tissue deformation, and makes up the influence of the skin soft tissue deformation on the overall shape repairing effect.
Detailed Description
1. Planar-like prosthesis re-repairing method based on skin soft tissue deformation
The basic steps are as follows:
a) measuring the surface area s of the proximal surface of the prosthesis1Measuring the surface area s 'of the skin-proximal side of the prosthesis'2Measuring the area s of the soft tissue of the skin of the human body to which the prosthesis implantation operation is intended3Skin thickness h at implant site of prosthesis0The area s after the corresponding deformation of the human skin soft tissue in the prosthesis implantation2Is as follows2＝s3-s1+s’2
b) Calculating the skin thickness h of the prosthesis after implantation1：h1＝h0×s3/s2
The reduction in skin soft tissue thickness is then: Δ h1＝h0-h0×s3/s2＝h0×(1-s3/s2)
Δh1I.e. the increase of the thickness of the prosthesis
The basic basis of the plane-like body restoration repairing method based on skin soft tissue deformation is as follows: when the implant is a near-plane body, the stress of each point on the surface of the skin soft tissue is the same and is T; meanwhile, the volume of the skin soft tissue is kept unchanged before and after the quasi-planar prosthesis is implanted, so that the ratio of the area of the skin soft tissue before and after the quasi-planar prosthesis is implanted is the compression ratio of the skin soft tissue. Namely, the reduction quantity delta h of the thickness of the skin soft tissue corresponding to the deformation of the skin soft tissue generated by the implantation of the prosthesis1I.e. the increase in prosthesis thickness.
2. The non-planar restoration re-repairing method based on skin soft tissue deformation comprises the following steps:
1) assuming that the stretching and the skin compression in the transverse and longitudinal directions of the skin surface and the direction vertical to the skin surface follow the same rule and the stress-strain is linear relation, the non-planar restoration re-repairing method comprises the following basic steps:
a) measuring the inflection angle a of a non-planar prosthesis
b) Stress T due to the restoration body folding back, stress decomposition is generated, wherein the compressive stress applied to the vertical skin soft tissue plane is 2T × cos (a/2), and the stress applied to the parallel skin soft tissue plane is changed into T × sin (a/2)
c) The plane stress of the parallel skin soft tissue is T × sin (a/2), and the corresponding strain1Is sin (a/2) × (1-s)3/s2) (according to the strain 1-s produced by the stress T3/s2So that T/(1-s)3/s2)＝T×sin(a/2)/1) The skin thickness after application of stress T × sin (a/2) became Δ h'1And Δ h'1＝h0-h0×sin(a/2)(1-s3/s2)＝h0×(1-sin(a/2)(1-s3/s2))
d) The skin soft tissue strain (namely the thickness reduction proportion) in the direction vertical to the skin soft tissue is delta h2/Δh’1Reduction of skin Soft tissue thickness Δ h2The calculation method comprises the following steps:
the stress applied to the perpendicular skin soft tissue plane is 2T × cos (a/2)
So that there is 2T × cos (a/2)/(Δ h)2/Δh’1)＝T/(1-s3/s2)
I.e. Δ h2＝Δh’1×2cos(a/2)×(1-s3/s2)
e) The total reduction quantity delta h of the thickness of the skin soft tissue at the back folding position of the prosthesis is as follows:
Δh＝h0×1+Δh2
i.e. Δ h ═ h0×sin(a/2)(1-s3/s2)×(1-2cos(a/2)(1-s3/s2))+h0×2cos(a/2)(1-s3/s2)
Namely the increment of the thickness of the returned position of the prosthesis, and the increment of the thicknesses of other positions of the prosthesis is delta h as the similar plane prosthesis1。
The basic basis of the non-planar restoration re-repairing method based on the skin soft tissue deformation is as follows: the stretching in the transverse and longitudinal directions of the skin soft tissue surface and the compression in the direction vertical to the skin soft tissue surface are assumed to follow the same rule, namely, the skin soft tissue is isotropic and the stress-strain satisfies a linear relation.
2) If the plane direction of the skin soft tissue is isotropic, and the compression direction (namely the direction vertical to the skin soft tissue) is different from the plane direction of the skin, the basic steps of the non-planar restoration reparation method are as follows:
a) measuring the inflection angle a of a non-planar prosthesis
b) Stress T due to the restoration body folding back, stress decomposition is generated, wherein the compressive stress applied to the vertical skin soft tissue plane is 2T × cos (a/2), and the stress applied to the parallel skin soft tissue plane is changed into T × sin (a/2)
c) The plane stress of the parallel skin soft tissue is T × sin (a/2), and the corresponding strain2Is sin (a/2) × (1-s)3/s2) (according to the strain 1-s produced by the stress T3/s2So that T/(1-s)3/s2)＝T×sin(a/2)/2) The skin thickness after application of stress T × sin (a/2) became Δ h'1And Δ h'1＝h0-h0×sin(a/2)(1-s3/s2)＝h0×(1-sin(a/2)(1-s3/s2))
d) According to the stress-strain curve in the plane of the skin soft tissue, when the strain is 1-s3/s2Then, the corresponding stress T value can be obtained;
e) the compressive stress of the non-planar restoration at the folding position is 2T × cos (a/2), and the corresponding strain of the skin soft tissue is obtained when the compressive stress is 2T × cos (a/2) by combining the compressive stress-strain curve of the skin3Then the skin soft tissue thickness is reduced by Δ h3＝Δh’1×3
f) The total reduction amount of the thickness of the skin soft tissue at the back folding position of the prosthesis is delta h, and delta h is h0×2+Δh3Δh＝h0×((1-3)sin(a/2)(1-s3/s2)+3)
Delta h is the increment of the thickness of the returned position of the prosthesis, and the increment of the thicknesses of other positions of the prosthesis is the same as that of the similar plane prosthesis and is delta h1。
The basis for adopting the scheme is as follows: the stress-strain relationship of the skin soft tissue needs to be determined in advance, and comprises the following steps: stress-strain curve of the plane of the skin soft tissue and compressive stress-strain curve of the plane vertical to the skin soft tissue.
Claims (3)
1. A restoration body reparation method based on skin soft tissue deformation is characterized in that: the device is used in a simulation system of the repairing effect of plastic repairing surgery, the repairing body is repaired again by using the deformation of the skin soft tissue generated by the implantation of the repairing body, and the influence of the deformation of the skin soft tissue on the repairing body is compensated;
the method specifically comprises the following steps: respectively establishing a restoration re-repairing method for the quasi-planar restoration and the non-planar restoration, and re-repairing the restoration;
a planar-like prosthesis: the prosthesis specifically comprises a forehead prosthesis and a temple prosthesis, wherein the non-planar prosthesis comprises the following components: comprises a nasal prosthesis;
implanting the quasi-planar prosthesis to uniformly reduce the thickness of the skin soft tissue at the implanted part, calculating the thickness variation of the skin soft tissue before and after implantation by using the condition of constant volume of the skin soft tissue, and repairing by using the thickness variation of the skin soft tissue;
the non-planar prosthesis is similar to the result of the planar prosthesis by the inflection, and the prosthesis repairing method is to calculate the change of the skin soft tissue stress caused by the inflection of the implanted prosthesis on the basis of the similar planar prosthesis repairing method and carry out secondary repair on the prosthesis by utilizing the stress change;
the method for repairing the skin soft tissue deformation similar plane body prosthesis comprises the following steps:
a) measuring the surface area s of the proximal surface of the prosthesis1Measuring the surface area s 'of the skin-proximal side of the prosthesis'2Measuring the area s of the soft tissue of the skin of the human body to which the prosthesis implantation operation is intended3Skin thickness h at implant site of prosthesis0The area s after the corresponding deformation of the human skin soft tissue in the prosthesis implantation2Is as follows2＝s3-s1+s’2
b) Calculating the skin thickness h of the prosthesis after implantation1：h1＝h0×s3/s2
The reduction in skin soft tissue thickness is then: Δ h1＝h0-h0×s3/s2＝h0×(1-s3/s2)
Δh1I.e. the increase of the thickness of the prosthesis
The ratio of the area of the skin soft tissue before and after the quasi-planar prosthesis is implanted is the compression ratio of the skin soft tissue; namely, the reduction quantity delta h of the thickness of the skin soft tissue corresponding to the deformation of the skin soft tissue generated by the implantation of the prosthesis1I.e. the increase in prosthesis thickness.
2. The prosthesis restorative repair method as set forth in claim 1,
if the stretching and the skin compression in the transverse and longitudinal directions of the skin surface and the direction vertical to the skin surface follow the same rule and the stress-strain relationship is linear, the non-planar restoration re-repairing method comprises the following steps:
a) measuring the reverse angle a of a non-planar prosthesis
b) Stress T due to the restoration body folding back, stress decomposition is generated, wherein the compressive stress applied to the vertical skin soft tissue plane is 2T × cos (a/2), and the stress applied to the parallel skin soft tissue plane is changed into T × sin (a/2)
c) The plane stress of the parallel skin soft tissue is T × sin (a/2), and the corresponding strain1Is sin (a/2) × (1-s)3/s2) According to the strain 1-s generated by the stress T3/s2So that T/(1-s)3/s2)＝T×sin(a/2)/1The skin thickness after application of stress T × sin (a/2) became Δ h'1And Δ h'1＝h0-h0×sin(a/2)(1-s3/s2)＝h0×(1-sin(a/2)(1-s3/s2))
d) The ratio of the skin soft tissue strain, i.e. the thickness reduction, in the direction perpendicular to the skin soft tissue is deltah2/Δh’1Reduction of skin Soft tissue thickness Δ h2The calculation method comprises the following steps:
the stress applied to the perpendicular skin soft tissue plane is 2T × cos (a/2)
So that there is 2T × cos (a/2)/(Δ h)2/Δh’1)＝T/(1-s3/s2)
I.e. Δ h2＝Δh’1×2cos(a/2)×(1-s3/s2)
e) The total reduction quantity delta h of the thickness of the skin soft tissue at the back folding position of the prosthesis is as follows:
Δh＝h0×1+Δh2
i.e. Δ h ═ h0×sin(a/2)(1-s3/s2)×(1-2cos(a/2)(1-s3/s2))+h0×2cos(a/2)(1-s3/s2)
Namely the increment of the thickness of the returned position of the prosthesis, and the increment of the thicknesses of other positions of the prosthesis is delta h as the similar plane prosthesis1。
3. The prosthesis restorative repair method as set forth in claim 1,
if the plane direction of the skin soft tissue is isotropic, and the compression direction, namely the direction vertical to the skin soft tissue is different from the plane direction of the skin, the steps of the non-planar restoration restitution method are as follows:
a) measuring the reverse angle a of a non-planar prosthesis
b) Stress T due to the restoration body folding back, stress decomposition is generated, wherein the compressive stress applied to the vertical skin soft tissue plane is 2T × cos (a/2), and the stress applied to the parallel skin soft tissue plane is changed into T × sin (a/2)
c) The plane stress of the parallel skin soft tissue is T × sin (a/2), and the corresponding strain2Is sin (a/2) × (1-s)3/s2)，
According to the strain 1-s generated by the stress T3/s2So that T/(1-s)3/s2)＝T×sin(a/2)/2The skin thickness after application of stress T × sin (a/2) became Δ h'1And Δ h'1＝h0-h0×sin(a/2)(1-s3/s2)＝h0×(1-sin(a/2)(1-s3/s2))
d) According to the stress-strain curve in the plane of the skin soft tissue, when the strain is 1-s3/s2Then, obtaining the corresponding stress T value;
e) the compressive stress of the non-planar restoration at the folding position is 2T × cos (a/2), and the corresponding strain of the skin soft tissue is obtained when the compressive stress is 2T × cos (a/2) by combining the compressive stress-strain curve of the skin3Then the skin soft tissue thickness is reduced by Δ h3＝Δh’1×3
f) The total reduction amount of the thickness of the skin soft tissue at the back folding position of the prosthesis is delta h, and delta h is h0×2+Δh3
Δh＝h0×((1-3)sin(a/2)(1-s3/s2)+3)
Delta h is the increment of the thickness of the returned position of the prosthesis, and the increment of the thicknesses of other positions of the prosthesis is the same as that of the similar plane prosthesis and is delta h1(ii) a The stress-strain relationship of the skin soft tissue needs to be determined in advance, and comprises the following steps: stress-strain curve of the plane of the skin soft tissue and compressive stress-strain curve of the plane vertical to the skin soft tissue.
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| CN1453748A (en) * | 2003-05-13 | 2003-11-05 | 中国医学科学院整形外科医院 | Digitized prepn of artificial implant for personalized facial plastics |
| CN1471412A (en) * | 2000-06-29 | 2004-01-28 | ����ϳɼ������ô�˾ | Composition and method for the repair and regeneration of cartilage and other tissues |
| WO2008038851A1 (en) * | 2006-09-30 | 2008-04-03 | Eun Hyun Bae | Lightweight silicone implant and manufacturing method thereof |
| CN102044086A (en) * | 2010-11-30 | 2011-05-04 | 华北水利水电学院 | Soft tissue deformation simulation method |
| EP2848231A1 (en) * | 2012-05-10 | 2015-03-18 | Pacificpharma Corporation | Filler for removing wrinkles |
| CN107582139A (en) * | 2008-04-01 | 2018-01-16 | 通用医疗公司 | The method and apparatus of tissue transplantation |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1471412A (en) * | 2000-06-29 | 2004-01-28 | ����ϳɼ������ô�˾ | Composition and method for the repair and regeneration of cartilage and other tissues |
| CN1453748A (en) * | 2003-05-13 | 2003-11-05 | 中国医学科学院整形外科医院 | Digitized prepn of artificial implant for personalized facial plastics |
| WO2008038851A1 (en) * | 2006-09-30 | 2008-04-03 | Eun Hyun Bae | Lightweight silicone implant and manufacturing method thereof |
| CN107582139A (en) * | 2008-04-01 | 2018-01-16 | 通用医疗公司 | The method and apparatus of tissue transplantation |
| CN102044086A (en) * | 2010-11-30 | 2011-05-04 | 华北水利水电学院 | Soft tissue deformation simulation method |
| EP2848231A1 (en) * | 2012-05-10 | 2015-03-18 | Pacificpharma Corporation | Filler for removing wrinkles |
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